CN108316892B - Drilling fluid internal-in and internal-out type petroleum drilling system - Google Patents

Abstract

Translated fromChinese

钻井液内进内出式石油钻井系统，包括钻井井架、钻井液进液罐、钻井液加压泵、钻井液回收泵、钻井液回收罐、井口防喷器、钻杆组件、地层密封筒和钻头；钻杆组件包括若干个依次连接的钻杆单元，每个钻杆单元的内部均设置有一块钻杆隔板，钻杆隔板的前后两侧边均与钻杆单元的内壁密封接触，钻杆隔板通过隔板固定组件固定在钻杆单元内，设置在不同钻杆单元内的钻杆隔板之间通过隔板连接组件连接，钻杆隔板将钻杆组件的内部分为左侧的钻井液输出通道和右侧的钻井液输入通道。本发明能够依靠钻井液回收泵与钻井液加压泵的作用，使钻井液在钻杆组件的内部完成输入和输出，避免钻井液大量流失，同时循环利用钻井液，降低钻井成本。

Drilling fluid inside-out oil drilling system, including drilling derrick, drilling fluid inlet tank, drilling fluid pressurizing pump, drilling fluid recovery pump, drilling fluid recovery tank, wellhead blowout preventer, drill pipe assembly, formation sealing cylinder and The drill bit; the drill pipe assembly includes several drill pipe units connected in sequence, each drill pipe unit is provided with a drill pipe partition plate, and the front and rear sides of the drill pipe partition plate are in sealing contact with the inner wall of the drill pipe unit. The drill pipe baffle is fixed in the drill pipe unit through the baffle fixing assembly, and the drill pipe baffles arranged in different drill pipe units are connected by the baffle connecting assembly. The drill pipe baffle divides the inside of the drill pipe assembly into left and right The drilling fluid output channel on the side and the drilling fluid input channel on the right. The invention can rely on the functions of the drilling fluid recovery pump and the drilling fluid pressurizing pump to complete the input and output of the drilling fluid inside the drill pipe assembly, avoid a large amount of drilling fluid loss, and simultaneously utilize the drilling fluid to reduce drilling costs.

Description

Drilling fluid internal-in and internal-out type petroleum drilling system

Technical Field

The invention belongs to the field of petroleum drilling and production, and relates to an internal-in and internal-out type petroleum drilling system of drilling fluid.

Background

The drilling fluid density window is narrow, which is easy to cause borehole wall instability, leakage reservoir damage and other complex drilling situations, and seriously restricts the development speed and economic benefit of oil and gas resources.

The problem caused by the narrow density window of the drilling fluid brings great difficulty and risk to actual construction (the density window refers to the density range of the drilling fluid, the narrow density window is that the density range which can be selected by the drilling fluid is very small in the process of drilling a certain stratum, the complex situation of drilling is easy to happen in the situation, the density of the drilling fluid exceeds the range to cause well leakage, and the well wall collapses and falls blocks when the density of the drilling fluid is lower than the range). The factors influencing the drilling fluid density window mainly comprise three aspects, namely formation characteristics which are mainly related to geological conditions, engineering design which is unreasonable can also increase the drilling difficulty to form a narrow density window, and drilling operation, such as high pumping and exciting pressure caused by high tripping speed, long exposed time of a borehole with large drilling fluid annulus counter-speed, and the like. Therefore, normal drilling can be performed only by expanding the drilling fluid density window, reducing the pressure loss of the circulating air and accurately controlling the pressure loss of the circulating air.

Disclosure of Invention

The invention provides an internal-in and internal-out type petroleum drilling system for drilling fluid, which can input and output the drilling fluid in a drilling rod component by virtue of the action of a drilling fluid recovery pump and a drilling fluid pressure pump, so that the drilling fluid is prevented from being lost in a large amount, the flow-back capability of rock debris is improved, the drilling fluid is recycled, the drilling cost is reduced, the hydraulic pressure difference between the drilling fluids is favorable for accelerating the drilling speed of a drill bit, and the drilling is promoted.

In order to solve the technical problems, the invention adopts the following technical scheme:

the drilling fluid internal-in and internal-out type petroleum drilling system comprises a drilling derrick, a drilling fluid inlet tank, a drilling fluid pressure pump, a drilling fluid recovery tank, a wellhead blowout preventer, a drill rod assembly, a stratum sealing cylinder and a drill bit;

the drilling derrick is provided with a power driving mechanism, the drilling fluid inlet tank, the drilling fluid pressure pump and the liquid inlet ends of the drill rod components are sequentially connected along the flowing direction of the drilling fluid through pipelines, the liquid return end of the drill rod component, the drilling fluid recovery pump and the drilling fluid recovery tank are sequentially connected along the flowing direction of the drilling fluid through pipelines, and the drilling fluid inlet tank and the drilling fluid recovery tank are connected through a drilling fluid circulating pipeline;

a borehole is drilled in the stratum right below the drilling derrick by a drill rod assembly and a drill bit, a wellhead blowout preventer is installed at the wellhead of the borehole, the drill rod assembly and the drill bit are arranged in the borehole, the drill rod assembly comprises a plurality of sections of drill rod units which are identical in structure and are sequentially connected from top to bottom, one section of drill rod unit penetrates through the wellhead blowout preventer and is rotatably connected with the wellhead blowout preventer, the upper end of the drill rod unit positioned at the uppermost section is in transmission connection with the power output end of a power driving mechanism, the drill rod unit is cylindrical, the lower end of the drill rod unit is downward and coaxially provided with a connecting raised head, the upper end of the drill rod unit is provided with a connecting groove, and the connecting raised head of the drill rod unit is;

a drill rod partition plate is vertically arranged in each section of drill rod unit, the front side edge and the rear side edge of each drill rod partition plate are in sealing contact with the inner wall of each drill rod unit, the drill rod partition plates are fixed in the drill rod units through partition plate fixing assemblies, the two adjacent upper and lower drill rod partition plates are connected through a partition plate connecting assembly, the interior of each drill rod unit is divided into two independent channels by the drill rod partition plates, the channel on the left side is a drilling fluid output channel, and the channel on the right side is a drilling fluid input channel;

the drilling rod unit positioned at the bottom is marked as a drilling bit fixing rod, the lower end of the drilling bit fixing rod is fixedly connected with a drilling bit connecting rod, a drilling bit is fixedly connected with the lower end of the drilling bit connecting rod, a stratum sealing cylinder is arranged on the outer ring of the lower part of the drilling bit fixing rod, the outer side wall of the stratum sealing cylinder is tightly attached to the inner wall of a well, the stratum sealing cylinder is of a cylindrical structure, the upper part of the stratum sealing cylinder is fixedly connected with an upper annular plate, the lower part of the stratum sealing cylinder is fixedly connected with a lower annular plate, the upper annular plate and the lower annular plate are supported by a plurality of supporting rods which are uniformly distributed along the circumferential direction, three first drilling fluid exchange holes are formed in the lower annular plate of the stratum sealing cylinder, a plurality of second drilling fluid exchange holes which are communicated with the inside of the stratum sealing cylinder, the drilling fluid return partition plate is a semicircular plate and is in sealing connection with the inner wall of the drill bit fixing rod and the left side face of the drill rod partition plate.

The upper part of the inner wall of the drill rod unit is provided with two upper mounting grooves which are symmetrical to each other along the radial direction of the drill rod unit, the lower part of the inner wall of the drill rod unit is provided with two lower mounting grooves which are symmetrical to each other along the radial direction of the drill rod unit, and the two upper mounting grooves and the two lower mounting grooves are respectively provided with a group of the clapboard fixing assemblies in a matched manner;

the partition plate fixing component comprises a partition plate chuck, a spring fixing shaft, a first spring and a second spring, the partition plate chuck is arranged along the radial direction of the drill rod unit and comprises a first connecting plate, a limiting ring and a limiting column, the limiting ring and the limiting column are arranged in the same axial direction, one end of the limiting ring and one end of the limiting column are fixedly connected to the first connecting plate, an annular clamping groove is formed between the limiting ring and the limiting column, one end of the spring fixing shaft is provided with a spring limiting groove in the same axial direction as the spring fixing shaft, the other end of the spring fixing shaft is fixedly connected with a second connecting plate, the second connecting plate is fixedly connected to the drill rod partition plate through a screw, the first spring is sleeved on the outer ring of the spring fixing shaft, the second spring is installed in the spring limiting groove, the spring fixing shaft extends into the annular clamping groove and is in inserting fit with the partition plate chuck, two ends of the first spring are respectively in top pressure, the baffle dop is installed in supporting last mounting groove or in the mounting groove down.

The partition plate connecting assembly comprises an expanding plate, fixing plates, a first pin shaft, a second pin shaft and a third spring, wherein the upper end and the lower end of the drill rod partition plate are respectively provided with an elongated slot along the front-back horizontal direction, the upper elongated slot positioned above is fixedly connected with a first jacking column, the lower elongated slot positioned below is fixedly connected with a second jacking column, the first jacking column and the second jacking column are coaxially arranged with the drill rod unit, the third spring is sleeved on the second jacking column, the expanding plate and the fixing plates are respectively provided with two fixing plates which are positioned at the same horizontal height and respectively fixedly connected on the left side surface and the right side surface of the drill rod partition plate, the two expanding plates are oppositely arranged on the left side and the right side, each expanding plate comprises a jacking portion and a rotating portion, the jacking portion is of a flat plate structure, the rotating portion is of an L-shaped bent plate structure, the two ends of the third spring are respectively in jacking contact with the bottom of the elongated slot and the upper surface of the jacking portion of, the free end of the jacking portion is provided with a front waist-shaped hole and a rear waist-shaped hole which are through, the jacking portions of the two opening plates are hinged through a first hinge pin penetrating through the two waist-shaped holes, the opening plates are hinged on the fixing plate at the corners of the rotating portions through second hinge pins, and when the jacking portions are in the horizontal position, the end faces of the free ends of the rotating portions are parallel to the drill rod partition plate and in jacking contact with the drill rod partition plate.

And a sealing ring is arranged between the connecting convex head of the drill rod unit and the connecting groove of the adjacent drill rod unit.

Fixedly connected with goes up annular step on the lower surface of the last annular plate of formation sealing cylinder, annular step under fixedly connected with on the upper surface of lower annular plate, it sets up with annular step down relatively to go up annular step, the outside of bracing piece is equipped with a plurality of bow reed, the bow reed is the V-arrangement structure, all bow reeds evenly encircle the drill bit dead lever setting along the circumferencial direction of drilling rod unit, the turning surface of bow reed and the inner wall roof pressure contact of formation sealing cylinder, two tip internal surfaces of bow reed respectively with the surface roof pressure contact of last annular step and lower annular step.

By adopting the technical scheme, the invention has the following advantages:

the drilling fluid booster pump can input the drilling fluid in the drilling fluid feed liquor tank into the drilling fluid input channel of the drill rod component, and the drilling fluid recovery pump can pump the drilling fluid in the drilling fluid output channel of the drill rod component out into the drilling fluid recovery tank and then circulate into the drilling fluid feed liquor tank through the drilling fluid circulation pipeline, so that the cyclic utilization of the drilling fluid is formed, the drilling fluid is recycled to the maximum extent, and the drilling cost is reduced.

The drilling fluid return baffle fixedly connected with the lower end of the drilling fluid output channel can prevent the drilling fluid in the drilling fluid input channel from directly entering the drilling fluid output channel.

The drill rod baffle plate in the drill rod component provides structural support for the inner inlet and the inner outlet of the drilling fluid, the drilling fluid completes input and output in the drill rod component under the combined action of the drilling fluid pressure pump and the drilling fluid recovery pump, the material exchange when the drilling fluid is in large-area contact with the stratum is avoided, and the condition that the drilling fluid is greatly lost when the drilling fluid returns to the ground is avoided.

The drilling fluid is input at one end and output at the other end under the combined action of the drilling fluid pressure pump and the drilling fluid recovery pump, and firstly, the rock debris generated in the drilling process can be effectively taken out of the well bottom, so that the back-flow capability of the rock debris is improved, and secondly, the input and the output of the drilling fluid form hydraulic pressure difference, so that the drilling speed of a drill bit is accelerated, and the drilling process is promoted. The invention can control the ECD (equivalent circulating density of drilling fluid) at the bottom of the well and prevent well leakage.

The drill rod separation plates arranged in different drill rod units are connected through the separation plate connecting assembly, when the connecting protruding heads of the drill rod units are screwed into the connecting grooves of the adjacent drill rod units, the first jacking columns at the upper ends of the drill rod separation plates in the adjacent drill rod units overcome the elastic force of the third springs, and push the jacking portions of the opening plates to move upwards, so that the two opening plates are closed, and the connection and the limiting between the drill rod separation plates are realized.

The sealing ring arranged between the connecting convex head of the drill rod unit and the connecting groove of the adjacent drill rod unit enables the drill rod units to be well sealed, and prevents drilling fluid from leaking.

The stratum sealing cylinder is provided with a plurality of bow reeds, and under the action of the bow reeds, the outer side wall of the stratum sealing cylinder is tightly attached to the inner wall of a well hole, so that drilling fluid below the stratum sealing cylinder is prevented from overflowing to the upper side of the stratum sealing cylinder.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view of the drill stem assembly and drill bit of the present invention;

FIG. 3 is an enlarged partial schematic view at A in FIG. 2;

FIG. 4 is a schematic view of the construction of the drill pipe unit of the present invention;

FIG. 5 is a schematic view of the spring mounting shaft of the present invention;

FIG. 6 is a schematic view of the structure of the spacer chuck of the present invention;

FIG. 7 is a schematic view of a single expansion panel of the present invention;

FIG. 8 is a schematic diagram of a formation seal cartridge according to the present invention.

Detailed Description

As shown in fig. 1 to 8, the left side of fig. 2 is the left direction of the invention, and the arrow direction in fig. 2 is the flow direction of the drilling fluid, the drilling fluid internal-in and internal-out type oil drilling system of the invention comprises a drilling derrick 1, a drillingfluid inlet tank 2, a drillingfluid pressure pump 3, a drillingfluid recovery pump 4, a drillingfluid recovery tank 5, awellhead blowout preventer 6, a drill rod assembly, aformation sealing cylinder 7 and adrill bit 8;

the drilling derrick comprises a drilling derrick 1, a drillingfluid inlet tank 2, a drillingfluid pressure pump 3, a drillingfluid recovery pump 4 and a drillingfluid recovery tank 5, wherein the drilling derrick 1 is fixed on the surface of astratum 9, a power driving mechanism is arranged on the drilling derrick 1, the drillingfluid inlet tank 2, the drillingfluid pressure pump 3 and aliquid inlet end 10 of a drilling rod component are sequentially connected along the flowing direction of drilling fluid through pipelines, aliquid return end 11 of the drilling rod component, the drillingfluid recovery pump 4 and the drillingfluid recovery tank 5 are sequentially connected along the flowing direction of drilling fluid through pipelines, and the drillingfluid inlet tank 2 and the drillingfluid recovery tank 5 are connected through a drilling fluid circulating;

aborehole 13 is drilled in astratum 9 right below the drilling derrick 1 through a drill rod assembly and adrill bit 8, awellhead blowout preventer 6 is installed at the wellhead of theborehole 13, the drill rod assembly and thedrill bit 8 are arranged in theborehole 13, the drill rod assembly comprises a plurality of sections ofdrill rod units 14 which are identical in structure and are sequentially connected from top to bottom, one section ofdrill rod unit 14 penetrates through thewellhead blowout preventer 6 and is rotatably connected with thewellhead blowout preventer 6, the upper end of thedrill rod unit 14 positioned at the uppermost section is in transmission connection with a power output end of a power driving mechanism, thedrill rod unit 14 is cylindrical, the lower end of thedrill rod unit 14 is downward coaxially provided with a connecting raisedhead 15, the upper end of thedrill rod unit 14 is provided with a connectinggroove 16, and the connecting raisedhead 15 of thedrill rod unit 14 is in threaded connection with;

a drillrod partition plate 17 is vertically arranged in each section ofdrill rod unit 14, the front side edge and the rear side edge of each drillrod partition plate 17 are in sealing contact with the inner wall of eachdrill rod unit 14, the drillrod partition plates 17 are fixed in thedrill rod units 14 through partition plate fixing assemblies, the drillrod partition plates 17 arranged in differentdrill rod units 14 are connected through partition plate connecting assemblies, the drillrod partition plates 17 divide the interior of each drill rod unit into two independent channels, the channel on the left side is a drillingfluid output channel 18, and the channel on the right side is a drillingfluid input channel 19;

thedrilling rod unit 14 located at the bottom is marked as a drillbit fixing rod 20, the lower end fixedly connected with drillbit connecting rod 21 of the drillbit fixing rod 20, thedrill bit 8 is fixedly connected at the lower end of the drillbit connecting rod 21, thestratum sealing cylinder 7 is installed at the lower outer ring of the drillbit fixing rod 20, the outer side wall of thestratum sealing cylinder 7 is tightly attached to the inner wall of thewell hole 13, thestratum sealing cylinder 7 is of a cylindrical structure, an upperannular plate 22 is fixedly connected to the upper portion of thestratum sealing cylinder 7, a lowerannular plate 23 is fixedly connected to the lower portion of thestratum sealing cylinder 7, the upperannular plate 22 and the lowerannular plate 23 are supported by a plurality of supportingrods 24 uniformly distributed along the circumferential direction, three first drillingfluid exchange holes 25 are formed in the lowerannular plate 23 of thestratum sealing cylinder 7, a plurality of second drillingfluid exchange holes 26 uniformly communicated with the inside of thestratum sealing cylinder 7 are formed in the circumferential direction in the left semicircle The drilling fluidreturn partition plate 27 is a semicircular plate, and the drilling fluidreturn partition plate 27 is hermetically connected with the inner wall of the drillbit fixing rod 20 and the left side surface of the drillrod partition plate 17.

The upper part of the inner wall of thedrill rod unit 14 is provided with two symmetricalupper mounting grooves 28 along the radial direction of thedrill rod unit 14, the lower part of the inner wall of thedrill rod unit 14 is provided with two symmetricallower mounting grooves 29 along the radial direction of thedrill rod unit 14, and a group of the clapboard fixing assemblies are arranged on the twoupper mounting grooves 28 and the twolower mounting grooves 29 in a matched manner;

the partition board fixing component comprises a partition board chuck 30 arranged along the radial direction of thedrill rod unit 14, aspring fixing shaft 31, afirst spring 32 and asecond spring 33, the partition board chuck 30 comprises a first connectingplate 34, a limitingring 35 and alimiting column 36 which are arranged in the same axial direction, one end of the limitingring 35 and one end of thelimiting column 36 are fixedly connected to the first connectingplate 34, an annular clamping groove is formed between the limitingring 35 and thelimiting column 36, one end of thespring fixing shaft 31 is provided with aspring limiting groove 37 which is coaxial with thespring fixing shaft 31, the other end of thespring fixing shaft 31 is fixedly connected with a second connectingplate 38, the second connectingplate 38 is fixedly connected to the drillrod partition board 17 through ascrew 39, thefirst spring 32 is sleeved on the outer ring of thespring fixing shaft 31, thesecond spring 33 is arranged in thespring limiting groove 37, thespring fixing shaft 31 extends into the annular clamping groove and is in inserted fit with the partition board chuck 30, two ends of thefirst spring 32, the two ends of thesecond spring 33 are respectively contacted with the groove bottom of thespring limiting groove 37 and thelimiting column 36 in a pressing manner, and the partition plate chuck 30 is arranged in the matchedupper mounting groove 28 orlower mounting groove 29.

The partition board connecting assembly comprises anopening board 40,fixing boards 41, afirst pin shaft 42, asecond pin shaft 43 and athird spring 44, wherein the upper end and the lower end of the drillrod partition board 17 are respectively provided with a long groove along the front-back horizontal direction, the long groove positioned above is fixedly connected with afirst jacking column 46, the long groove positioned below is fixedly connected with asecond jacking column 45, thefirst jacking column 46 and thesecond jacking column 45 are respectively arranged coaxially with thedrill rod unit 14, thethird spring 44 is sleeved on thesecond jacking column 45, theopening board 40 and thefixing boards 41 are respectively provided with two, the twofixing boards 41 are positioned at the same horizontal height and are respectively and fixedly connected on the left side surface and the right side surface of the drillrod partition board 17, the twoopening boards 40 are oppositely arranged left and right, eachopening board 40 comprises ajacking portion 47 and a rotatingportion 48, the jackingportion 47 is of a flat board structure, the rotatingportion 48 is of an L-shaped bent board structure, the two ends of thethird spring 44 are respectively in jacking and pressing contact with the bottom of the long groove, one end of the jackingportion 47 is fixedly connected with one end of the rotatingportion 48, a front-back through waist-shaped hole 49 is formed in the free end of the jackingportion 47, thejacking portions 47 of the twoopening plates 40 are hinged throughfirst hinge pins 42 penetrating through the two waist-shaped holes 49, theopening plates 40 are hinged to thefixing plate 41 at the corners of the rotatingportion 48 throughsecond hinge pins 43, and when the jackingportion 47 is in a horizontal position, the end face of the free end of the rotatingportion 48 is parallel to and in jacking contact with the drillrod partition plate 17.

Asealing ring 50 is arranged between thecoupling nipple 15 of adrill rod unit 14 and the coupling recess 16 of an adjacentdrill rod unit 14. A good seal between thedrill pipe units 14 is achieved preventing leakage of drilling fluid.

The lower surface of the upperannular plate 22 of thestratum sealing barrel 7 is fixedly connected with an upperannular step 51, the upper surface of the lowerannular plate 23 is fixedly connected with a lowerannular step 52, the upperannular step 51 and the lowerannular step 52 are arranged oppositely, the outer side of thesupport rod 24 is provided with a plurality ofbow spring pieces 53, thebow spring pieces 53 are of a V-shaped structure, all thebow spring pieces 53 are uniformly arranged around the drillbit fixing rod 20 along the circumferential direction of thedrill rod unit 14, the corner outer surfaces of thebow spring pieces 53 are in abutting contact with the inner wall of thestratum sealing barrel 7, and the inner surfaces of two end parts of thebow spring pieces 53 are in abutting contact with the outer surfaces of the upperannular step 51 and the lowerannular step 52 respectively. Under the action of thebow spring 53, the outer side wall of theformation sealing barrel 7 is tightly attached to the inner wall of theborehole 13, so that the drilling fluid below theformation sealing barrel 7 is prevented from overflowing to the upper part of theformation sealing barrel 7.

The use process comprises the following steps: firstly, fixing adrill rod clapboard 17 in adrill rod unit 14 through a clapboard fixing component, specifically: the second connectingplates 38 on thespring fixing shafts 31 in each group of partition fixing assemblies are fixedly connected to thedrill rod partition 17 throughscrews 39 respectively, then thefirst springs 32 are sleeved on the outer rings of thespring fixing shafts 31 respectively, thesecond springs 33 are installed in thespring limiting grooves 37, thespring fixing shafts 31 are inserted into the partition chuck 30, then thedrill rod partition 17 is installed in the correspondingdrill rod unit 14, the partition chuck 30 on the upper portion is clamped in the matchedupper installation groove 28, and the partition chuck 30 on the lower portion is clamped in the matchedlower installation groove 29.

And then the drillrod partition plates 17 arranged in differentdrill rod units 14 are connected through a partition plate connecting assembly, specifically: when the connectingnose 15 of adrill rod unit 14 is not screwed into the connectinggroove 16 of an adjacentdrill rod unit 14, thethird spring 44 sleeved on thesecond jacking leg 45 presses the jackingportion 47 of theopening plate 40 downwards, at this time, the twoopening plates 40 are in an opening state, namely, the end surface of the free end of the rotatingportion 48 of the twoopening plates 40 is far away from thedrill rod partition 17 in the adjacentdrill rod unit 14, the twoopening plates 40 cannot limit and connect thedrill rod partition 17, when the connectingnose 15 of thedrill rod unit 14 is screwed into the connectinggroove 16 of the adjacentdrill rod unit 14, thefirst jacking leg 46 at the upper end of thedrill rod partition 17 in the adjacentdrill rod unit 14 overcomes the elastic force of thethird spring 44 to push thejacking portion 47 of theopening plate 40 to move upwards, at this time, the twoopening plates 40 are closed, namely, the end surface of the free end of the rotatingportion 48 of the twoopening plates 40 is close to and finally clings to thedrill rod partition 17 in the adjacentdrill rod unit 14, the connection and the limit between two adjacent drillrod partition plates 17 are realized, and all the drillrod partition plates 17 are ensured to be positioned on the same plane.

During the well drilling process, during the input drilling fluid, drilling fluid gets into the drillingfluid input channel 19 of drilling rod subassembly from theinlet end 10 of drilling rod subassembly, 8 positions of working of drill bit are entered into to rethread drillbit connecting rod 21 is inside, and supply withdrill bit 8, when taking out drilling fluid, drilling fluid gets into the sealed section ofthick bamboo 7 of stratum through the three first drillingfluid exchange hole 25 of the sealed section ofthick bamboo 7 ofdrill bit 8 positions of the below space of the sealed section ofthick bamboo 7 of stratum, later get into in the drill bitdead lever 20 through the second drillingfluid exchange hole 26 that sets up on the left semicircle of drill bitdead lever 20, and in being taken out drillingfluid recovery tank 5 along drillingfluid output channel 18.

The drilling fluidreturn baffle plate 27 fixedly connected to the lower end of the drillingfluid outlet channel 18 prevents the drilling fluid in the drillingfluid inlet channel 19 from directly entering the drillingfluid outlet channel 18.

The drillingfluid pressure pump 3 can input the drilling fluid in the drillingfluid inlet tank 2 into a drillingfluid input channel 19 of the drill rod assembly, and the drillingfluid recovery pump 4 can pump the drilling fluid in a drillingfluid output channel 18 of the drill rod assembly into a drillingfluid recovery tank 5 and then circulate into the drillingfluid inlet tank 2 through a drillingfluid circulation pipeline 12, so that the cyclic utilization of the drilling fluid is formed, the drilling fluid is recycled to the maximum extent, and the drilling cost is reduced.

The drillrod partition plate 17 in the drill rod component provides structural support for the internal inlet and the internal outlet of the drilling fluid, the drilling fluid is input and output in the drill rod component under the combined action of the drillingfluid pressure pump 3 and the drillingfluid recovery pump 4, the material exchange between the drilling fluid and thestratum 9 during large-area contact is avoided, and the condition that the drilling fluid is greatly lost when returning to the ground is avoided.

The drilling fluid is input at one end and output at the other end under the combined action of the drillingfluid pressure pump 3 and the drillingfluid recovery pump 4, and firstly, the stone chips generated in the drilling process can be effectively taken out of the well bottom, and secondly, the input and the output of the drilling fluid form hydraulic pressure difference, so that the drilling speed of adrill bit 8 is accelerated, and the drilling process is promoted.

The drillingfluid inlet tank 2, the drillingfluid booster pump 3, the drillingfluid recovery pump 4, the drillingfluid recovery tank 5, thewellhead blowout preventer 6, thedrill bit 8 and thebow reed 53 are all conventional devices, and the specific structures are not detailed.

The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims (5)

Translated fromChinese

1.钻井液内进内出式石油钻井系统，其特征在于：包括钻井井架、钻井液进液罐、钻井液加压泵、钻井液回收泵、钻井液回收罐、井口防喷器、钻杆组件、地层密封筒和钻头；1. In-in-out-out type oil drilling system in drilling fluid, it is characterized in that: comprise drilling derrick, drilling fluid inlet tank, drilling fluid pressurizing pump, drilling fluid recovery pump, drilling fluid recovery tank, wellhead blowout preventer, drill pipe assemblies, formation seal cylinders and drill bits;钻井井架、钻井液进液罐、钻井液加压泵、钻井液回收泵和钻井液回收罐均固定在地层表面，钻井井架上设置有动力驱动机构，钻井液进液罐、钻井液加压泵和钻杆组件的进液端通过管路沿钻井液的流动方向依次连接，钻杆组件的回液端、钻井液回收泵和钻井液回收罐通过管路沿钻井液的流动方向依次连接，钻井液进液罐和钻井液回收罐之间通过钻井液循环管线连接；The drilling derrick, the drilling fluid inlet tank, the drilling fluid pressurizing pump, the drilling fluid recovery pump and the drilling fluid recovery tank are all fixed on the surface of the formation. The drilling derrick is provided with a power drive mechanism, the drilling fluid inlet tank and the drilling fluid pressurizing pump. It is connected with the liquid inlet end of the drill pipe assembly in sequence along the flow direction of the drilling fluid through the pipeline, and the liquid return end of the drill pipe assembly, the drilling fluid recovery pump and the drilling fluid recovery tank are connected in sequence along the flow direction of the drilling fluid through the pipeline. The fluid inlet tank and the drilling fluid recovery tank are connected by the drilling fluid circulation pipeline;钻井井架的正下方的地层内由钻杆组件和钻头钻有井眼，井口防喷器安装在井眼的井口处，钻杆组件和钻头设置在井眼内，钻杆组件包括若干节结构相同且从上至下依次连接的钻杆单元，其中一节钻杆单元穿过井口防喷器并与井口防喷器转动连接，位于最上一节的钻杆单元的上端与动力驱动机构的动力输出端传动连接，钻杆单元呈圆筒状，钻杆单元的下端向下同轴向设置有连接凸头，钻杆单元的上端设置有连接凹槽，钻杆单元的连接凸头螺纹连接在相邻钻杆单元的连接凹槽内；A wellbore is drilled in the stratum directly below the drilling derrick by a drill pipe assembly and a drill bit. The wellhead blowout preventer is installed at the wellhead of the wellbore. The drill pipe assembly and the drill bit are arranged in the wellbore. The drill pipe assembly includes several sections with the same structure. The drill pipe units connected in sequence from top to bottom, one of the drill pipe units passes through the wellhead blowout preventer and is rotatably connected with the wellhead blowout preventer, and the upper end of the drill pipe unit located in the uppermost section is connected to the power output of the power drive mechanism End drive connection, the drill rod unit is cylindrical, the lower end of the drill rod unit is provided with a connecting convex head in the same axial direction, the upper end of the drill rod unit is provided with a connecting groove, and the connecting convex head of the drill rod unit is threadedly connected in the corresponding direction. In the connecting groove of the adjacent drill pipe unit;每节钻杆单元的内部均竖向设置有一块钻杆隔板，钻杆隔板的前后两侧边均与钻杆单元的内壁密封接触，钻杆隔板通过隔板固定组件固定在钻杆单元内，上下相邻两块钻杆隔板之间通过隔板连接组件连接，钻杆隔板将钻杆组件的内部分为两个独立的通道，位于左侧的通道为钻井液输出通道，位于右侧的通道为钻井液输入通道；The interior of each drill pipe unit is vertically provided with a drill pipe partition, the front and rear sides of the drill pipe partition are in sealing contact with the inner wall of the drill pipe unit, and the drill pipe partition is fixed on the drill pipe through the partition fixing assembly In the unit, the upper and lower adjacent drill pipe baffles are connected by the baffle connecting assembly. The drill pipe baffle divides the interior of the drill pipe assembly into two independent channels. The channel on the left is the drilling fluid output channel. The channel on the right is the drilling fluid input channel;位于最下方的钻杆单元记为钻头固定杆，钻头固定杆的下端固定连接有钻头连接杆，钻头固定连接在钻头连接杆的下端，地层密封筒安装在钻头固定杆的下部外圈，且地层密封筒的外侧壁紧贴井眼的内壁，地层密封筒为圆筒状结构，地层密封筒的上部固定连接有上环形板，地层密封筒的下部固定连接有下环形板，上环形板与下环形板之间通过若干个沿周向均布的支撑杆支撑，地层密封筒的下环形板上开设有三个第一钻井液交换孔，钻头固定杆的左半圆上沿周向设有若干个均与地层密封筒内部连通的第二钻井液交换孔，钻井液输出通道的下端口处设置有与钻杆隔板固定连接的钻井液回液隔板，钻井液回液隔板为半圆形板，钻井液回液隔板与钻头固定杆的内壁和钻杆隔板的左侧面密封连接。The drill rod unit located at the bottom is recorded as the drill bit fixing rod. The lower end of the drill bit fixing rod is fixedly connected with the drill bit connecting rod. The drill bit is fixedly connected to the lower end of the drill bit connecting rod. The outer side wall of the sealing cylinder is close to the inner wall of the wellbore, the formation sealing cylinder is a cylindrical structure, the upper part of the formation sealing cylinder is fixedly connected with an upper annular plate, the lower part of the formation sealing cylinder is fixedly connected with a lower annular plate, and the upper annular plate is connected with the lower The annular plates are supported by a number of supporting rods evenly distributed along the circumferential direction. The lower annular plate of the formation sealing cylinder is provided with three first drilling fluid exchange holes, and the left semicircle of the fixed rod of the drill bit is provided with several circumferentially uniform sealing cylinders. The second drilling fluid exchange hole communicated inside, the lower port of the drilling fluid output channel is provided with a drilling fluid return baffle fixedly connected with the drill pipe baffle, the drilling fluid return baffle is a semicircular plate, and the drilling fluid returns. The liquid separator is sealed and connected with the inner wall of the drill bit fixing rod and the left side of the drill rod separator.2.根据权利要求1所述的钻井液内进内出式石油钻井系统，其特征在于：钻杆单元内壁的上部沿钻杆单元的径向开设有两个相互对称的上安装槽，钻杆单元内壁的下部沿钻杆单元的径向开设有两个相互对称的下安装槽，两个上安装槽和两个下安装槽均配套设置有一组所述的隔板固定组件；2. The drilling fluid in-in-out-out type oil drilling system according to claim 1, wherein the upper part of the inner wall of the drill pipe unit is provided with two mutually symmetrical upper installation grooves along the radial direction of the drill pipe unit, and the drill pipe The lower part of the inner wall of the unit is provided with two mutually symmetrical lower installation grooves along the radial direction of the drill rod unit, and the two upper installation grooves and the two lower installation grooves are matched with a set of the partition fixing components;隔板固定组件包括沿钻杆单元径向方向设置的隔板卡头、弹簧固定轴、第一弹簧和第二弹簧，隔板卡头包括第一连接板、同轴向设置的限位环和限位柱，限位环和限位柱的一端均固定连接在第一连接板上，限位环和限位柱之间形成环形卡槽，弹簧固定轴的一端开设有与弹簧固定轴同轴向的弹簧限位槽，弹簧固定轴的另一端固定连接有第二连接板，第二连接板通过螺钉固定连接在钻杆隔板上，第一弹簧套设在弹簧固定轴的外圈，第二弹簧安装在弹簧限位槽内，弹簧固定轴伸入到环形卡槽内并与隔板卡头插接配合，第一弹簧的两端分别与第二连接板和限位环顶压接触，第二弹簧的两端分别与弹簧限位槽的槽底和限位柱顶压接触，隔板卡头安装在配套的上安装槽内或者下安装槽内。The baffle fixing assembly includes a baffle chuck, a spring fixing shaft, a first spring and a second spring arranged along the radial direction of the drill rod unit. The baffle chuck includes a first connecting plate, a limit ring arranged in the same axial direction and The limit post, the limit ring and one end of the limit post are both fixedly connected to the first connecting plate, an annular slot is formed between the limit ring and the limit post, and one end of the spring fixing shaft is provided with a coaxial with the spring fixing shaft The other end of the spring fixing shaft is fixedly connected with a second connecting plate, the second connecting plate is fixedly connected to the drill rod partition by screws, the first spring is sleeved on the outer ring of the spring fixing shaft, The second spring is installed in the spring limit groove, the spring fixing shaft extends into the annular groove and is inserted and matched with the clapboard head, and the two ends of the first spring are in top pressure contact with the second connecting plate and the limit ring, respectively. Both ends of the second spring are respectively in pressure contact with the bottom of the spring limiting groove and the top of the limiting column, and the baffle chuck is installed in the matching upper or lower installation groove.3.根据权利要求1所述的钻井液内进内出式石油钻井系统，其特征在于：隔板连接组件包括张开板、固定板、第一销轴、第二销轴和第三弹簧，钻杆隔板的上下两端均沿前后水平方向开设有长槽，位于上方的长槽内固定连接有第一顶压柱，位于下方的长槽内固定连接有第二顶压柱，第一顶压柱和第二顶压柱均与钻杆单元同轴向设置，第三弹簧套设在第二顶压柱上，张开板和固定板均设有两个，两个固定板位于同一水平高度且分别固定连接在钻杆隔板的左右两侧面上，两个张开板左右相对设置，每个张开板均包括顶压部和转动部，顶压部为平板结构，转动部为L形弯板结构，第三弹簧的两端分别与长槽的槽底和张开板的顶压部的上表面顶压接触，顶压部的一端与转动部的一端固定连接，顶压部的自由端设有前后通透的腰形孔，两个张开板的顶压部通过穿过两个腰形孔的第一销轴铰接，张开板于转动部的拐角处通过第二销轴铰接在固定板上，顶压部处于水平位置时，转动部的自由端的端面与钻杆隔板平行并顶压接触。3. The drilling fluid in-in-out type oil drilling system according to claim 1, characterized in that: the diaphragm connecting assembly comprises a spreading plate, a fixing plate, a first pin, a second pin and a third spring, The upper and lower ends of the drill pipe partition are provided with long grooves along the front and rear horizontal directions. Both the top-pressing column and the second top-pressing column are arranged in the same axial direction as the drill pipe unit, the third spring is sleeved on the second top-pressing column, there are two opening plates and two fixed plates, and the two fixed plates are located in the same The horizontal height is fixedly connected to the left and right sides of the drill pipe partition, and the two opening plates are arranged opposite to each other. Each opening plate includes a top pressing part and a rotating part. L-shaped bent plate structure, both ends of the third spring are in top pressure contact with the groove bottom of the long groove and the upper surface of the top pressure part of the open plate, one end of the top pressure part is fixedly connected with one end of the rotating part, and the top pressure part The free end is provided with front and rear transparent waist-shaped holes, the top pressing parts of the two opening plates are hinged through the first pin shaft passing through the two waist-shaped holes, and the opening plates pass through the second pin at the corner of the rotating part. The shaft is hinged on the fixed plate, and when the pressing part is in a horizontal position, the end face of the free end of the rotating part is parallel to the partition plate of the drill pipe and is in pressing contact.4.根据权利要求1所述的钻井液内进内出式石油钻井系统，其特征在于：钻杆单元的连接凸头与相邻钻杆单元的连接凹槽之间设置有密封圈。4 . The drilling fluid in-in-out type oil drilling system according to claim 1 , wherein a sealing ring is provided between the connection boss of the drill pipe unit and the connection groove of the adjacent drill pipe unit. 5 .5.根据权利要求1所述的钻井液内进内出式石油钻井系统，其特征在于：地层密封筒的上环形板的下表面上固定连接有上环形台阶，下环形板的上表面上固定连接有下环形台阶，上环形台阶和下环形台阶相对设置，支撑杆的外侧设有若干个弓簧片，弓簧片为V形结构，所有弓簧片沿钻杆单元的圆周方向均匀环绕钻头固定杆设置，弓簧片的拐角外表面与地层密封筒的内壁顶压接触，弓簧片的两个端部内表面分别与上环形台阶和下环形台阶的外表面顶压接触。5. The drilling fluid in-in-out type oil drilling system according to claim 1, wherein the upper annular step is fixedly connected on the lower surface of the upper annular plate of the formation sealing cylinder, and the upper surface of the lower annular plate is fixed on the lower surface. A lower annular step is connected, and the upper annular step and the lower annular step are arranged oppositely. Several bow springs are arranged on the outer side of the support rod. The bow springs have a V-shaped structure. All bow springs evenly surround the drill bit along the circumferential direction of the drill rod unit. The fixed rod is arranged, the outer surface of the corner of the bow spring is in pressure contact with the inner wall of the formation sealing cylinder, and the inner surfaces of the two ends of the bow spring are respectively in pressure contact with the outer surfaces of the upper and lower annular steps.

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