US20060157257A1 - Fluid flow control device and method for use of same - Google Patents

Abstract

A fluid flow control device (130) for use in a wellbore to control the inflow of production fluids comprises a screen assembly (132) positioned around a base pipe (134). The base pipe (134) has a blank pipe section and a perforated section including at least one fluid passageway (136). The screen assembly (132) has a filter medium section (142) positioned around the blank pipe section and defining a first region (144) therebetween and a housing section (146) positioned around the perforated section defining a second region (148) therebetween with a sleeve (150) slidably positioned therein. When it is desired to prevent the inflow of the production fluids through the fluid flow control device (130), the sleeve (150) is operated from a first position to a second position which prevent fluid flow from the second region (148) to the fluid passageway (136).

Description

CROSS-REFERENCE TO RELATED APPLICATIONS
• This is a divisional application of co-pending application Ser. No. 10/227,935, entitled Fluid Flow Control Device and Method for Use of Same, filed on Aug. 26, 2002, now U.S. Pat. No. ______.
TECHNICAL FIELD OF THE INVENTION
• This invention relates, in general, to controlling the inflow of formation fluids from a well that traverses a hydrocarbon bearing subterranean formation and, in particular, to a fluid flow control device for controlling the inflow of formation fluids and a method for use of the same.
BACKGROUND OF THE INVENTION
• Without limiting the scope of the present invention, its background will be described with reference to producing fluid from a subterranean formation, as an example. After drilling each of the sections of a subterranean wellbore, individual lengths of relatively large diameter metal tubulars are typically secured together to form a casing string that is positioned within each section of the wellbore. This casing string is used to increase the integrity of the wellbore by preventing the wall of the hole from caving in. In addition, the casing string prevents movement of fluids from one formation to another formation. Conventionally, each section of the casing string is cemented within the wellbore before the next section of the wellbore is drilled.
• Once this well construction process is finished, the completion process may begin. The completion process comprises numerous steps including creating hydraulic openings or perforations through the production casing string, the cement and a short distance into the desired formation or formations so that production fluids may enter the interior of the wellbore. The completion process may also include installing a production tubing string within the well casing which is used to produce the well by providing the conduit for formation fluids to travel from the formation depth to the surface.
• To selectively permit and prevent fluid flow into the production tubing string, it is common practice to install one or more sliding sleeve type flow control devices within the tubing string. Typical sliding sleeve type flow control devices comprise a generally tubular body portion having side wall inlet openings formed therein and a tubular flow control sleeve coaxially and slidably disposed within the body portion. The sleeve is operable for axial movement relative to the body portion between a closed position, in which the sleeve blocks the body inlet ports, and an open position, in which the sleeve uncovers the ports to permit fluid to flow inwardly therethrough into the interior of the body and thus into the interior of the production tubing string. The sliding sleeves thus function as movable valve elements operable to selectively permit and prevent fluid inflow. Generally, cylindrical shifter tools, coaxially lowered into the interior of the tubing string, are utilized to shift selected ones of the sliding sleeves from their closed positions to their open positions, or vice versa, to provide subsurface flow control in the well.
• It has been found, however, that typical sliding sleeve type flow control devices are not suitable in completions requiring sand control as they are not compatible with typical sand control screens. Recently, a device has been proposed that combines sand control and fluid flow control, which was disclosed in U.S. Pat. No. 5,896,928. Specifically, the device includes a generally tubular body for placement into the wellbore. The tubular body has a sand control screen at an outer surface for preventing sand from entering into tubular body. After the fluid flows through the sand control screen it must pass through a labyrinth. A slidable sleeve on the labyrinth controls the fluid velocity therethrough. The slidable sleeve is moved by a remotely and electrically-operated device placed in the tubular body. The fluid leaving the labyrinth passes to the tubing string for carrying the fluid to the surface.
• It has been found, however, the labyrinth type flow control devices are difficult and expensive to manufacture and can be unreliable under certain inflow conditions. Accordingly, need has arisen for a fluid flow control device for controlling the inflow of formation fluids in a completion requiring sand control. A need has also arisen for such a fluid flow control device that is not difficult or expensive to manufacture. Further, a need has arisen for such a fluid flow control device that is reliable in a variety of flow conditions.
SUMMARY OF THE INVENTION
• The present invention disclosed herein comprises a fluid flow control device for controlling the inflow of formation fluids in completions requiring sand control and a method for use of the same. The fluid flow control device of the present invention is not difficult or expensive to manufacture. In addition, the fluid flow control device of the present invention is reliable in a variety of flow conditions.
• The fluid flow control device of the present invention comprises a sand control screen having a base pipe with a set of openings that allows the production fluids to flow therethrough. The fluid flow control device also includes a sleeve coaxially disposed adjacent to the base pipe. The sleeve also has a set of openings that allows the production fluids to flow therethrough. The sleeve is selectively positionable relatively to the base pipe and may form an annulus therebetween such that the pressure drop in the production fluids flowing therethrough is selectively controllable by adjusting the alignment of the set of openings of the sleeve relative to the set of openings of the base pipe.
• In one embodiment of the fluid flow control device of the present invention, the sleeve is axially selectively positionable relative to the base pipe. In another embodiment, the sleeve is rotatably selectively positionable relative to the base pipe. In yet another embodiment, the sleeve is axially and rotatably selectively positionable relative to the base pipe. In one embodiment of the fluid flow control device of the present invention, the sleeve is coaxially positioned interiorly relative to the base pipe. In another embodiment of the fluid flow control device of the present invention, the sleeve is coaxially positioned exteriorly relative to the base pipe.
• In one embodiment of the fluid flow control device of the present invention, the set of openings of the sleeve has substantially the same geometry as the set of openings of the base pipe. In another embodiment, the set of openings of the sleeve has a different geometry than the set of openings of the base pipe. In one embodiment of the fluid flow control device of the present invention, the openings of the sleeve have substantially the same shape as the openings of the base pipe. In another embodiment, the openings of the sleeve have a different shape than the openings of the base pipe.
• The fluid flow control device of the present invention has a fully open position wherein the pressure drop in the production fluids traveling through the set of openings of the sleeve, the annulus between the sleeve and the base pipe and the set of openings of the base pipe is at a minimum. In addition, most embodiments of the fluid flow control device of the present invention have partially open or choking positions wherein the pressure drop in the production fluids is increased. Further, some embodiments of the fluid flow control device of the present invention have a fully closed position wherein the production fluids are prevented from traveling therethrough.
• The fluid flow control device of the present invention may be operated between its fully open position, its choking positions and its fully closed position using a variety of techniques such as using a mechanical shifting tool, using hydraulic pressure, using an electrically operated device or the like. In addition, downhole pressure sensors positioned exteriorly and interiorly of the fluid flow control device may be used to determine the pressure drop in the production fluids. Such pressure readings may be used by a downhole control circuit to automatically adjust the position of the sleeve relative to the base pipe to control the pressure drop in the production fluids. Other types of sensors may also be used in conjunction with the fluid flow control device of the present invention such as temperature sensors and fluid composition sensors that may be used to determine the constituents of the production fluids including, for example, the oil, gas, water, solids and fines content of the fluid as well as, for example, the API gravity of the fluid.
• In another aspect of the present invention a method for controlling the inflow of production fluids comprises providing a production conduit including a sand control screen having a base pipe with a first set of openings and a sleeve coaxially disposed adjacent to the base pipe having a second set of openings, installing the production conduit within the wellbore, producing the production fluids into the production conduit through the first set of openings of the base pipe and the second set of openings of the sleeve and selectively adjusting the sleeve relative to the base pipe such that the pressure drop in the production fluids is controlled by adjusting the alignment of the first set of openings relative to the second set of openings.
• The present invention also comprises a fluid flow control device that includes a tubular member having at least one fluid passageway in a sidewall section thereof. A sand control screen assembly is positioned exteriorly around the tubular member. The sand control screen assembly has a filter medium section that defines a first annular region with the tubular member and a housing section that defines a second annular region with the tubular member. A sleeve is slidably positioned within the second annular region. The sleeve has an open position wherein fluid communication is permitted between the second annular region and the fluid passageway and a closed position wherein fluid communication is prevented between the second annular region and the fluid passageway.
• The fluid flow control device also includes a hydraulic control line that extends from a surface location to the sand control screen assembly. The hydraulic control line has a first section with a terminus that is selectively in fluid communication with the sleeve to operate the sleeve from the open position to the closed position. A eutectic valve is positioned within the housing section to selectively prevent and permit fluid communication between the first section of the hydraulic control line and the sleeve. The hydraulic control line also has a second section that passes through the first annular region and extends downhole of the sand control screen assembly.
• The fluid flow control device has a sensor that may be positioned on the housing section of the sand control screen assembly to sense at least one downhole parameter such as temperature, pressure, fluid composition or the like. An energy conductor that extends from the surface and passes through the sand control screen assembly is in communication with the eutectic valve and the sensor. In operation, energy is supplied to the eutectic valve in response to one of the sensed downhole parameters, which melts the eutectic valve and establishes fluid communication between the first section of the hydraulic control line and the sleeve, thereby operating the sleeve from the open position to the closed position.
BRIEF DESCRIPTION OF THE DRAWINGS
• For a more complete understanding of the features and advantages of the present invention, reference is now made to the detailed description of the invention along with the accompanying figures in which corresponding numerals in the different figures refer to corresponding parts and in which:
• FIG. 1 is a schematic illustration of an offshore oil and gas platform operating a plurality of fluid flow control devices according to the present invention;
• FIG. 2 is a half sectional view of a fluid flow control device according to the present invention positioned in its fully open position;
• FIG. 3 is a half sectional view of a fluid flow control device according to the present invention positioned in a choking position;
• FIG. 4 is a half sectional view of a fluid flow control device according to the present invention positioned in a choking position;
• FIG. 5 is a half sectional view of a fluid flow control device according to the present invention positioned in a choking position;
• FIG. 6 is a half sectional view of a fluid flow control device according to the present invention positioned in its fully closed position;
• FIG. 7 is a half sectional view of a fluid flow control device according to the present invention positioned in its fully open position;
• FIG. 8 is a half sectional view of a fluid flow control device according to the present invention positioned in its open position;
• FIG. 9 is a half sectional view of a fluid flow control device according to the present invention positioned in its closed positions; and
• FIG. 10 is a half sectional view of a fluid flow control device according to the present invention having a sleeve positioned exteriorly of the base pipe and positioned in its open position.
DETAILED DESCRIPTION OF THE INVENTION
• While the making and using of various embodiments of the present invention are discussed in detail below, it should be appreciated that the present invention provides many applicable inventive concepts which can be embodied in a wide variety of specific contexts. The specific embodiments discussed herein are merely illustrative of specific ways to make and use the invention, and do not delimit the scope of the present invention.
• Referring initially toFIG. 1, an offshore oil and gas platform operating a plurality of fluid flow control devices is schematically illustrated and generally designated10. Asemi-submersible platform12 is centered over submerged oil andgas formations14,16 located belowsea floor18. Asubsea conduit20 extends from awellhead installation22 to asubsea installation24. Awellbore26 extends through the various earthstrata including formations14,16. A casing string28 is cemented withinwellbore26 bycement30. Casing string28 includesperforations32 andperforations34 that respectively allow formation fluids fromformations14,16 to enter the interior of casing string28.
• Positioned within casing string28 and extending fromwellhead installation22 is atubing string36.Tubing string36 provides a conduit for formation fluids to travel fromformations14,16 to the surface. A pair ofpackers38,40 provide a fluid seal betweentubing string36 and casing string28 and define a production interval adjacent toformation14. Likewise,packers42,44 provide a fluid seal betweentubing string36 and casing string28 and define a production interval adjacent toformation16.
• Positioned withintubing string36 in the production interval adjacent toformation14 are fluidflow control devices46,48 and50. Likewise, positioned withintubing string36 within the production interval adjacent toformation16 are fluidflow control devices52,54 and56. As explained in greater detail below, each of the fluid flow control devices46-56 provides not only fluid flow control capability but also sand control capability.
• In the illustrated embodiment, there are three fluidflow control devices46,48,50 associated withformation14 and threefluid control devices52,54,56 associated withformation16. Accordingly, the inflow of fluid fromformation14 andformation16 may be controlled. For example, if the reservoir pressure offormation14 is significantly higher than the reservoir pressure offormation16, fluidflow control devices46,48,50 may be used to choke the fluid flow fromformation14 to a greater extent than fluidflow control devices52,54,56 will choke the fluid flow fromformation16. In addition, the fluid flow control devices of the present invention are independently controllable within each production interval. For example, certain ones of fluidflow control devices46,48,50 may be used to choke or even close off certain sections of the production interval adjacent toformation14 to prevent the production of water or other undesirable fluids. Similarly, one or all of the fluid flow control devices associated with a particular production interval may be adjusted over time as the adjacent formation becomes depleted or as downhole equipment experiences wear.
• It should be understood by those skilled in the art that even thoughFIG. 1 has depicted three fluid flow control devices associated with each production interval, any number of fluid flow control devices either greater than or less than three may alternatively be used without departing from the principles of the present invention. Also, even thoughFIG. 1 has depicted a vertical wellbore, the fluid flow control devices of the present invention are equally well suited for use in wellbores having other directional configuration such as incline wellbores, deviated wellbores or horizontal wellbores.
• It should be understood by those skilled in the art that even thoughFIG. 1 has depicted an offshore production operation, the fluid flow control devices of the present invention are equally well suited for onshore operations. Also, even thoughFIG. 1 has depicted a cased wellbore, the fluid flow control devices of the present invention are equally well suited for use in open hole completions.
• Referring next toFIG. 2, a fluid flow control device of the present invention is depicted and generally designated60. Fluidflow control device60 includes a sandcontrol screen assembly62.Sand control assembly62 includes abase pipe64 that has a plurality ofopenings66 that allow the flow of production fluids into the production tubing. Even thoughopenings66 are depicted as round openings, it should be understood by those skilled in the art that openings of other configurations may alternatively be used and are considered within the scope of the present invention. For example,openings66 could alternatively have a non circular shape such as an oval shape, a square shape, a rectangular shape or other similar shapes. Accordingly, the term openings as used herein is intended to encompass any type of discontinuity inbase pipe64 that allows for the flow of fluids therethrough including, but not limited to, perforations, holes and slots of any configuration that are presently known in the art or subsequently discovered. In addition, the exact number and size ofopening66 are not critical to the present invention, so long as sufficient area is provided for fluid production and the integrity ofbase pipe64 is maintained.Openings66 form a particular hole pattern inbase pipe64, the importance of which will be explained in more detail below.
• Positioned aroundbase pipe64 is afilter medium68. In the illustrated embodiment,filter medium68 is a fluid-porous, particulate restricting material such as a plurality of layers of a wire mesh that are diffusion bonded or sintered together to form a porous wire mesh screen designed to allow fluid flow therethrough but prevent the flow of particulate materials of a predetermined size from passing therethrough. Disposed aroundfilter medium68 is anouter shroud70.Outer shroud70 has a plurality ofopenings72 which allow the flow of production fluids therethrough. The exact number, size and shape ofopenings72 are not critical to the present invention, so long as sufficient area is provided for fluid production and the integrity ofouter shroud70 is maintained.Outer shroud70 is designed to protectfilter medium68 during installation of fluidflow control device60 into the wellbore as well as during production therethrough.
• Positioned coaxially withinbase pipe64 is asleeve74.Sleeve74 is slidable coupled withinbase pipe64 using detents such as collets or pins (not pictured) or other suitable devices that are well known to those skilled in the art.Sleeve74 has a plurality ofopenings76. As withopenings66 ofbase pipe64,openings76 ofsleeve74 may have any geometric configuration that is suitable for allowing the flow of production fluids therethrough. While the illustrated embodiment depictsopenings76 ofsleeve74 as having the same shape and size asopenings66 ofbase pipe64, this relationship is not required by the present invention. For example, a fluid flow control device of the present invention could have slotted openings insleeve74 while having round openings inbase pipe64. In the illustrated embodiment, the hole pattern ofopenings66 ofbase pipe64 andopenings76 ofsleeve74 have substantially the same geometry. In addition,openings66 ofbase pipe64 andopenings76 ofsleeve74 are substantially aligned with one another. Accordingly, when fluidflow control device60 is in the depicted configuration, the pressure drop in the production fluids traveling therethrough is at a minimum and fluidflow control device60 is considered to be in its fully opened position. Specifically, to enter in the interior of fluidflow control device60, the fluid must travel through an entry opening, one of theopenings66 ofbase pipe64, anannulus78 betweenbase pipe64 andsleeve74 and an exit opening, one of theopenings76 ofsleeve74. Asopenings66 ofbase pipe64 andopenings76 ofsleeve74 are substantially aligned with one another, the distance the fluid is required to flow inannulus78 is at a minimum.
• Referring now toFIG. 3, therein is depicted a fluid flow control device of the present invention that is generally designated80. The construction of fluidflow control device80 is substantially identical to the construction of fluidflow control device60 ofFIG. 2. Fluidflow control device80 is operated using amechanical shifter82 that may be carried downhole on awireline84. To allowshifter tool84 to interact withsleeve74, the interior side surfaces ofsleeve74 may have formed therein a longitudinally spaced series of annular, traversed notches, that receive a key set carried onmechanical shifter82. Oncemechanical shifter82 is received bysleeve74,sleeve74 may be slidably shifted in the axial direction as can be seen by comparing the position ofsleeve74 relative tobase pipe64 inFIGS. 2 and 3.
• In the illustrated embodiment,sleeve74 has been axially repositioned to increase the pressure drop experienced by production fluids traveling throughannulus78. Specifically, as the set ofopenings66 ofbase pipe64 and the set ofopenings76 ofsleeve74 have substantially the same hole pattern, whenopenings66 andopenings76 are axially misaligned, the distance the formation fluids must travel withinannulus78 is increased, thereby increasing the pressure drop in the formation fluids. The amount of this pressure drop or choking is determined based upon a number of factors including the extent of the misalignment ofopenings66 relative toopenings76, the thickness ofannulus78, the viscosity of the formation fluids and the like. In addition, the surface characteristics of either the exterior ofsleeve74 or the interior ofbase pipe64 or both may be configured to further control the pressure drop. For example, grooves, channels, knurling, other turbulizing surfaces or the like may be added to one or both of the surfaces to increase the turbulence in the fluid flow thereby increasing the pressure drop across a given distance. Accordingly, once fluidflow control device80 is installed downhole, the desired amount of pressure drop may be obtained by selectively misaligningopenings66 relative toopenings76 by axially shiftingsleeve74 relative tobase pipe64. Also, it should be noted that sensors, such as position sensors, pressure sensors, temperature sensors, fluid composition sensors and the like may be used in conjunction withmechanical shifter82 to determined the desired extent of the misaligning ofopenings66 relative toopenings76, as explained in greater detail below.
• Referring next toFIG. 4, therein is depicted a fluid flow control device of the present invention that is generally designated90. Fluidflow control device90 is constructed in a manner substantially identical to fluidflow control device60 ofFIG. 2. In the illustrated embodiment, fluidflow control device90 is operated by anelectromechanical shifter92 that is run downhole on anelectric line94.Electromechanical shifter94 may be received withinsleeve74 in a manner similar to that described above with reference tomechanical shifter82 ofFIG. 3. Once in place,electromechanical shifter92 may be energized viaelectric line94 such thatsleeve74 may be rotatably shifted relative tobase pipe64.
• In the illustrated embodiment,sleeve74 has been rotated ninety degrees relative tobase pipe64. This rotation increases the distance betweenopenings76 ofsleeve74 andopenings66 ofbase pipe64. Accordingly, the formation fluid being produced into fluidflow control device90 must travel an increased distance inannulus78 relative to the position shown inFIG. 2. This increased distance equates to an increased pressure drop in the formation fluids. The desired amount of pressure drop may be achieved by selecting the amount of circumferential misalignment betweenopenings76 ofsleeve74 andopenings66 ofbase pipe64. Also, it should be noted that sensors, such as position sensors, pressure sensors, temperature sensors, fluid composition sensors and the like may be used in conjunction withelectromechanical shifter92, these sensors may be permanently disposed downhole or may be carried downhole with theelectromechanical shifter92.
• Referring next toFIG. 5, therein is depicted a fluid flow control device of the present invention that is generally designated100. Fluidflow control device100 is constructed in substantially the same manner as fluidflow control device60 ofFIG. 2. Fluidflow control device100 is operated using a downholeelectrical motor102 that is positioned withinannulus78 betweensleeve74 andbase pipe64. Downholeelectrical motor102 receives power fromenergy conductors104 that may extend to the surface or may extend to a downhole electrical power source such as a battery pack or a downhole electrical generator. Downholeelectrical motor102 includes a control circuit that commands downholeelectrical motor102 to shiftsleeve74 relative tobase pipe64 when it is desirable to adjust the pressure drop in the production fluids being produced therethrough. A pair ofpressure sensors106,108 are used to monitor the pressure on the exterior of fluidflow control device100 and the pressure on the interior of fluidflow control device100, respectively.
• The pressure information may be carried to the surface viaenergy conductors104 where it may be processed then command signals may be returned to the control circuit of downholeelectrical motor102 viaenergy conductors104 to initiate the operation of downholeelectrical motor102. Alternatively, the pressure information may be sent directly to the control circuit of downholeelectrical motor102 frompressure sensors106,108 to initiate operation of downholeelectrical motor102. Additionally,sleeve74 may include a position sensor that identifies the relative position ofsleeve74 andbase pipe64 to further refine the operation of shiftingsleeve74. The position sensor may be powered byenergy conductors104 and may send signals to the surface or directly to the control circuit of downholeelectric motor102.
• In the illustrated embodiment, downholeelectrical motor102 is operable to axially adjust the position ofsleeve74 relative tobase pipe64 and rotatably adjust the position ofsleeve74 relative tobase pipe64. By comparingFIGS. 2 and 5, it can be seen thatsleeve74 has been axially and rotatably adjusted relative tobase pipe64. Accordingly, the distance betweenopenings76 ofsleeve74 andopenings66 ofbase pipe64 has been increased, which in turn increases the distance the production fluids must travel inannulus78 resulting in an increase in the pressure drop in the production fluids. This embodiment of fluidflow control device100 is particularly suitable for precision control of the pressure drop due to the interaction ofpressure sensors106,108, the position sensor and the control circuit of downholeelectrical motor102.
• Referring now toFIG. 6, therein is depicted another embodiment of a fluid flow control device of the present invention that is generally designated110. Fluidflow control device110 is constructed in substantially the same manner as fluidflow control device60 ofFIG. 2 with the exception that fluidflow control device110 includes a plurality ofseals112 carried bybase pipe64. The operation of fluidflow control device110 is hydraulically controlled in a conventional manner by increasing and decreasing the pressure withinhydraulic control lines114,116 which allowssleeve74 to axially shiftrelative base pipe64. As described above, asopenings76 ofsleeve74 become misaligned withopenings66 ofbase pipe64, the pressure drop in the formation fluids being produced therethrough increases. In the illustrated embodiment, however, whensleeve74 is shifted to the illustrated position relative tobase pipe64, fluid production through fluidflow control device110 is prevented as each of theopenings76 ofsleeve74 are positioned between a pair ofseals112. Accordingly, fluidflow control device110 can be operated from a fully opened position (seeFIG. 2) to a fully closed positioned as well as various choking positions therebetween.
• Referring next toFIG. 7, therein is depicted a fluid flow control device of the present invention that is generally designated120. Fluid flow control device120 is constructed in substantially the same manner as fluidflow control device60 ofFIG. 2, however,sleeve74 as depicted inFIG. 2 has been replaced withsleeve122.Sleeve122 includes a plurality ofopenings124 that form a hole pattern with a geometry that is different from the hole pattern ofopenings66 ofbase pipe64. Fluid flow control device120 is operated using a downholeelectrical motor126 which is operable torotatably shift sleeve122 relative tobase pipe64. This rotation aligns the various columns ofopenings124 ofsleeve122 withopenings66 ofbase pipe64. In the illustrated configuration, each opening66 ofbase pipe64 is aligned with anopening124 ofsleeve122. Whensleeve122 is rotated using downholeelectrical motor126, however, some of theopenings66 ofbase pipe64 will no longer be aligned with anopening124 ofsleeve122. Accordingly, the pressure drop in the production fluids is controlled by adjusting the relative alignment ofopenings124 ofsleeve122 withopenings66 ofbase pipe64.
• Referring now toFIG. 8, therein is depicted another embodiment of a fluid flow control device of the present invention that is generally designated130. Fluidflow control device130 includes a sandcontrol screen assembly132. Sandcontrol screen assembly132 includes abase pipe134 that has a series ofopenings136 that are circumferentially spaced therearound. Sandcontrol screen assembly132 has a pair ofscreen connectors138,140 that attach asand control screen142 tobase pipe134.Screen connectors138,140 may be attached tobase pipe134 by welding or other suitable technique.Sand control screen142 may comprise a screen wire wrapped around a plurality of ribs to form turns having gaps therebetween which allow the flow of formation fluids therethrough but which block the flow of particulate matter therethrough. The number of turns and the size of the gaps between the turns are determined based upon the characteristics of the formation from which fluid is being produced and the size of the gravel to be used during a gravel packing operation, if any.
• Screen connectors138,140 attachsand control screen142 tobase pipe134 such that anannulus144 is formed betweensand control screen142 andbase pipe134. It should be noted that centralizers or other support members may be disposed withinannulus144 to supportsand control screen142 and maintain the standoff betweensand control screen142 andbase pipe134. Coupled to the upper end ofscreen connector140 is ahousing member146.Housing member146 forms anannulus148 withbase pipe134 adjacent toopenings136. Disposed withinannulus148 is a slidingsleeve150 having a pair ofseals151 disposed on the interior side thereof to provide a seal againstbase pipe134 and a pair ofseals153 disposed on the exterior side thereof to provide a seal againsthousing member146.
• Disposed exteriorly ofbase pipe134 and extending from the surface is a hydraulicfluid conduit152. One portion of hydraulicfluid conduit152 extends into afluid passageway154 withinhousing member146. Disposed withinfluid passageway154 is avalve156, such as a eutectic valve. Another portion of hydraulicfluid conduit152 extends into and throughhousing member146 andscreen connector140 intoannulus144. This portion of hydraulicfluid conduit152 extends throughannulus144 to exit sandcontrol screen assembly132 throughscreen connector138.
• Importantly, this portion of hydraulicfluid conduit152 runs within a recess or channel inhousing member146 and on the inside ofsand control screen142, instead of the outside ofsand control screen142, which removes the need to band hydraulicfluid conduit152 to the exterior ofsand control screen142 which would block the inflow of formation fluids through those portions ofsand control screen142 covered by the banding material. Also, this portion of hydraulicfluid conduit152 is protected by havingsand control screen142 positioned exteriorly thereof. Alternatively, the channel on the exterior ofhousing member146 could be extended along the exterior ofsand control screen142 such that hydraulicfluid conduit152 could be positioned within the channel for protection. As can be seen inFIG. 8, hydraulicfluid conduit152 is capable of providing operating fluid to fluidflow control device130 and is also capable of providing operating fluid to other devices downhole of fluidflow control device130 such as additional fluid flow control devices positioned further downhole.
• Asensor158 is positioned on the exterior ofhousing member146.Sensor158 may provide information relating to a variety of downhole parameters such as pressure, temperature, fluid composition or the like.Sensor158 is in communication with the surface viaenergy conductors160.Energy conductors160 may provide power and communication capabilities tosensor158 as well as tovalve156. In the case in whichvalve156 is a eutectic valve and it is desirable to operate fluidflow control device130 to the closed position, energy is conducted tovalve156 viaenergy conductors160 to melt the eutectic material such that operating fluid from hydraulicfluid conduit152 may be communicated to slidingsleeve150.Energy conductors160 also extend through fluidflow control device130 in a manner similar to hydraulicfluid conduit152 by passing throughhousing member146,screen connector140,annulus144 andscreen connector138. Alternatively, instead of usingsensor158 to obtain information relating to downhole parameters,energy conductors160 may include a fiber optic cable which may be used to obtain certain downhole parameters such as temperature and pressure at particular locations.
• In operation and referring both toFIGS. 8 and 9, fluidflow control device130 is used to filter particulate matter out of production fluids and control the flow of fluids into the tubing string. More specifically, when fluidflow control device130 is in its open position as depicted inFIG. 8, formation fluids are produced throughsand control screen142 intoannulus144. These formation fluids then travel upwardly throughscreen connector140 that has a plurality of axially extending openings allowing the formation fluids to pass intoannulus148 abovescreen connector140. Fromannulus148, fluid communication is allowed throughopenings136 such that the formation fluids may travel to the surface via the tubing string.
• If it is determined that production through fluidflow control device130 should no longer continue, fluidflow control device130 may be operated to its closed position as depicted inFIG. 9. For example, ifsensor158 has sensed that the formation fluids are being produced through fluidflow control device130 contain an undesirable percentage of water, then a signal may be sent to the surface viaenergy conductors160 indicating such a fluid composition. Thereafter, power may be sent tovalve156 viaenergy conductors160 and through appropriate switching or addressing circuitry such that the eutectic material ofvalve156 is melted, thereby allowing fluid communication throughfluid passageway154. Thereafter, operating fluid from hydraulicfluid conduit152 may act on slidingsleeve150 such thatopenings136 ofbase pipe134 are no longer in communication withannulus148. Once in this configuration, fluidflow control device130 no longer permits formation fluids to flow therethrough.
• As described above, hydraulicfluid conduit152 andenergy conductors160 pass through sandcontrol screen assembly132 such that similar operations may be conducted on fluid flow control devices or other devices that are positioned downhole of fluidflow control device130.
• Referring now toFIG. 10, therein is depicted another embodiment of a fluid flow control device of the present invention that is generally designated170. Fluidflow control device170 includes a sandcontrol screen assembly172. Sandcontrol screen assembly172 includes abase pipe174 that has a series ofopenings176. Sandcontrol screen assembly172 also has ascreen support member178 that is attached by welding or other suitable technique at opposite ends tobase pipe174 and has a series ofopenings180. The filter media of sandcontrol screen assembly172 is depicted as a wire wrappedscreen182 such as that described above with reference toFIG. 8.
• Unlike the previously disclosed fluid flow control devices, fluidflow control device170 is constructed with asleeve184 coaxially positioned exteriorly ofbase pipe174.Sleeve184 has a plurality ofopenings186 that have substantially the same geometry asopenings176 ofbase pipe174. In the illustrated embodiment,sleeve184 is closely received aroundbase pipe174 such that there is a friction fit therebetween. This friction fit can operate substantially as a seal to provide significant resistance to flow betweensleeve184 andbase pipe174 whenopenings186 are not aligned withopenings176. Alternatively, an annulus may be formed betweensleeve184 andbase pipe174 operating substantially asannulus78 discussed above. The operation of fluidflow control device170 is hydraulically controlled in a conventional manner by increasing and decreasing the pressure withinhydraulic control lines188,190 which allowssleeve184 to axially shiftrelative base pipe174.
• While this invention has been described with reference to illustrative embodiments, this description is not intended to be construed in a limiting sense. Various modifications and combinations of the illustrative embodiments as well as other embodiments of the invention, will be apparent to persons skilled in the art upon reference to the description. It is, therefore, intended that the appended claims encompass any such modifications or embodiments.

Claims (20)

1. A fluid flow control device for use in a wellbore to control the inflow of production fluids comprising:

a tubular member having a blank pipe section and a perforated section including at least one fluid passageway;

a screen assembly positioned exteriorly of the tubular member, the screen assembly having a filter medium section positioned around the blank pipe section and defining a first region therebetween and a housing section positioned around the perforated section defining a second region therebetween;

a sleeve slidably positioned within the second region, the sleeve having a first position wherein fluid communication is permitted between the second region and the fluid passageway and a second position wherein fluid communication is prevented between the second region and the fluid passageway; and

a control line extendable from uphole of the screen assembly, the control line having a first section that is operable to selectively communicate with the sleeve to operate the sleeve from its first to its second position, the control line having a second section that is extendable downhole of the screen assembly.

2. The fluid flow control device as recited inclaim 1 wherein the control line is a hydraulic control line.

3. The fluid flow control device as recited inclaim 1 further comprising a valve positioned within the housing section to selectively prevent and permit fluid communication between the first section of the control line and the sleeve.

4. The fluid flow control device as recited inclaim 3 wherein the valve is a eutectic valve.

5. The fluid flow control device as recited inclaim 1 further comprising a sensor operably associated with the screen assembly to sense at least one downhole parameter selected from the group comprising temperature, pressure and fluid composition.

6. The fluid flow control device as recited inclaim 1 further comprising an energy conductor extendable from uphole of the screen assembly and extendable downhole of the screen assembly.

7. The fluid flow control device as recited inclaim 6 wherein the energy conductor further comprising an electrical conductor.

8. The fluid flow control device as recited inclaim 6 wherein the energy conductor further comprising a fiber optic conductor.

9. The fluid flow control device as recited inclaim 8 wherein the fiber optic conductor provides information relating to at least one downhole parameter selected from the group comprising temperature and pressure to a surface location from a location proximate the screen assembly.

10. The fluid flow control device as recited inclaim 1 wherein the control line passes through the first region.

11. A fluid flow control device for use in a wellbore to control the inflow of production fluids comprising:

a tubular member having at least one fluid passageway in a sidewall section thereof;

a screen assembly positioned exteriorly around the tubular member, the screen assembly having a filter medium section defining a first annular region with the tubular member and a housing section defining a second annular region with the tubular member;

a sleeve slidably positioned within the second annular region, the sleeve having a first position wherein fluid communication is permitted between the second annular region and the fluid passageway and a second position wherein fluid communication is prevented between the second annular region and the fluid passageway;

a hydraulic control line extending from a surface location to the screen assembly, the hydraulic control line having a first section with a terminus that is selectively in fluid communication with the sleeve to operate the sleeve from the first position to the second position, the hydraulic control line having a second section that passes through the first annular region and extends downhole of the screen assembly;

a eutectic valve positioned within the housing section to selectively prevent and permit fluid communication between the first section of the hydraulic control line and the sleeve;

a sensor positioned on the housing section to sense at least one downhole parameter selected from the group comprising temperature, pressure and fluid composition; and

an energy conductor extending from the surface location to the screen assembly, the energy conductor passing through the first annular region and extending downhole of the screen assembly, the energy conductor in communication with the eutectic valve and the sensor, whereby energy is supplied to the eutectic valve in response to the sensed downhole parameter, thereby operating the sleeve from the first position to the second position.

12. A method for controlling the inflow of production fluids into a production conduit within a wellbore, the method comprising the steps of:

providing the production conduit including a screen assembly positioned around a base pipe, the base pipe having a blank pipe section and a perforated section including at least one fluid passageway, the screen assembly having a filter medium section positioned around the blank pipe section and defining a first region therebetween and a housing section positioned around the perforated section defining a second region therebetween with a sleeve slidably positioned therein;

installing the production conduit within the wellbore;

producing the production fluids into the production conduit through the filter medium, the first and second regions and the fluid passageway; and

operating the sleeve from a first position to a second position to prevent the inflow of the production fluids.

13. The method as recited inclaim 12 wherein the step of operating the sleeve from a first position to a second position to prevent the inflow of the production fluids further comprises communicating an operating fluid via a control line to the sleeve to operate the sleeve from its first to its second position.

14. The method as recited inclaim 13 further comprising passing the control line through the first region to a location downhole of the screen assembly.

15. The method as recited inclaim 13 wherein the step of operating the sleeve from a first position to a second position to prevent the inflow of the production fluids further comprises operating a valve to allow communication of the operating fluid.

16. The method as recited inclaim 15 wherein the step of operating the sleeve from a first position to a second position to prevent the inflow of the production fluids further comprises melting material in a eutectic valve.

17. The method as recited inclaim 12 wherein the step of operating the sleeve from a first position to a second position to prevent the inflow of the production fluids further comprises sensing at least one downhole parameter selected from the group comprising temperature, pressure and fluid composition.

18. The method as recited inclaim 17 wherein the step of operating the sleeve from a first position to a second position to prevent the inflow of the production fluids further comprises sensing the at least one downhole parameter with a sensor operably associated with the screen assembly.

19. The method as recited inclaim 18 further comprising providing power and signal capabilities to the sensor via an energy conductor.

20. The method as recited inclaim 17 wherein the step of operating the sleeve from a first position to a second position to prevent the inflow of the production fluids further comprises sensing the at least one downhole parameter with a fiber optic conductor.

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