CN1008470B - Insert for insulated steam injection tubing - Google Patents

Abstract

The present invention relates to an insertion pipe fitting for a steam injection pipeline for heat preservation, which carries out thermal insulation in the joint zone of two double-layer pipe sections of the steam injection pipeline and is arranged in the pipe sections which are in butt joint and shields the ends of the two pipe sections from the inner side. The insertion pipe fitting is a double-layer device, an interval is maintained between pipe walls while the ends of the pipe walls are connected with each other, and heat preservation materials can be arranged in annular space formed between the double-layer walls. Meanwhile, the insertion pipe fitting is combined with one of the two pipe ends and maintains an interval with the other to prevent steam leakage and permit steam to come into the interval between the insertion pipe fitting and a pipe joint head, and the steam is condensed into water to form a medium for thermal insulation.

Description

Insert for insulated steam injection tubing

The present invention relates to be incubated the joint of steam pipeline, for example inject steam to improve the pipeline of crude oil recovery ratio to underground oil-containing structure, this class pipeline is formed by connecting by a lot of double-deck pipeline section that can be incubated; The present invention especially relates to a kind of line device, and the insertion pipe fitting of garden cylindricality is housed at its one or more tunnel joints place, to reduce the heat-energy losses of joint.

High temperature and high pressure steam is injected underground oil-containing structure become a kind of important oil production method that improves the crude oil recovery ratio, typical way be will insulation double-deck pipeline section connect with threaded sleeve pipe or pipe joint and become pipe and go here and there, each double-deck pipeline section comprises concentric interior pipe and the outer tube that suit gets up, one annular space is arranged between two pipes, this annular space is closed at the two ends of pipeline section, filled heat insulating material in the space.Annotating the steam pipe string will have suitable insulation measure the best in quality to guarantee at its bottom steam.

Getting up with seal ring or sleeve and inner and outer pipes soldering and sealing and come annular seal space with this in the two ends of each pipeline section, perhaps also the two ends enlarging of interior pipe can be made with outer tube to contact, and in the end two pipe soldering and sealing got up then.The outer tube end outer surface car of every pipeline section has screw thread, couples together with the pipeline section of a pipe joint that has an internal thread with two counterparts.Since the end of inner and outer pipes be soldering and sealing together, have considerable heat to be delivered to pipe joint and lose by weld seam or other devices that links inner and outer pipes.

An object of the present invention is to adopt a kind of device to reduce near the radiation loss of pipe joint.

Another object of the present invention is to adopt a kind of like this device to make steam condensate accumulate near the pipe joint and be in immobilising state, thereby plays a kind of effect of heat insulation medium.

A further object of the invention be to provide on a kind of structure solid and in use reliably the device.

According to the present invention, the piecing devices that are used for delivering vapor are to be no less than the device that one space is arranged and be coaxial docking between two pipeline section mouths of pipe, every above-mentioned pipeline section has pipe in an outer tube and, inner and outer pipe is installed the maintenance spacing with one heart, thereby form an annular space, it is characterized in that: the two ends of interior pipe cylindrical tube are connected to outer dilator tube and with outer tube, can establish thermal insulation apparatus in the annular space; Form the passage of a delivering vapor in the interior pipe cylindrical tube, a cylindrical insertion pipe fitting is contained in the end that above-mentioned two butt joint pipeline sections are interior and cover above-mentioned two pipeline sections; One coupling device is connected at least one pipe end in above-mentioned insertion pipe fitting and the above-mentioned pipe end; Above-mentioned insertion pipe fitting is made up of cylindrical internals and a cylindrical outer part, above-mentioned cylindrical outer part wraps in outside the above-mentioned cylindrical internals, thereby there is spacing to form an annular space between the two, the end of above-mentioned internals and the outer part no radial clearance that connects together.

As the accompanying drawing of this specification constituent element, wherein the number that is indicated all drawing middle fingers all be same or component that it is suitable, these accompanying drawings comprise:

Fig. 1 is shown with the heat insulation insertion pipe fitting of installing according to optimum implementation of the present invention in the drawings for annotating the vertical cross section of a certain part of steam pipe string;

The section that Fig. 2 is cut for 2-2 line among Fig. 1;

Fig. 2 A is the right half of partial enlarged drawing of Fig. 2;

Fig. 3 is the half-sectional view according to the insertion pipe fitting of second kind of embodiment installing of the present invention;

Fig. 4 is the sectional drawing of another embodiment of the present invention of similar Fig. 3; And

Fig. 5 is the sectional drawing of another embodiment of the present invention of similar Fig. 3.

Fig. 1 shows a part of annotating the steam pipe string, and this kind pipe string is preferably to be connected bypipe joint 11 in the mode of mouth of pipe line up by thepipeline section 10 of many elongations to form, and only shows a joint among the figure.The every bimetallic tube thatpipeline section 10 is made up of theinterior pipe 12 and theouter tube 13 of concentric suit.Between the two-layer pipe in thespace 14 that does not radially contact mutually to form an annular.

Pipe 12 has a columnarmain pipe 40 in every, and its internal diameter can be considered the size of annotating without hindrance flow area in the steam pipe string, and this internal diameter is numbered 42 in Fig. 1.The enlarging that radial dilatation is made in theend 41 and 45 atpipe 12main pipe 40 two ends in every touches the mouth of pipe ofouter tube 13 until it, therefore in tube section ends the space bigger than normal flow area is arranged.In pipe and outer tube in the end bycircumferential weld 15 with its sealing and combine, therefore the annular space between the inner andouter pipes 14 can be evacuated also/or filled heat insulating material with the heat loss of minimizing vapor stream when the interior pipe.

Arrow 43 expression steam among Fig. 1 down flow direction in pipe.Eachpipe joint 11 theouter tube 13 usefulness screws of upper and lower twocounterpart pipeline sections 10 are coupled together and the center line that keeps two pipes to directly.But Applicable scope of the present invention also comprises the pipe that otherwise connects.Usually between the end of thepipeline section 10 of two butt joints, leavespace 16.

If the joint does not have suitable insulation measure, appreciable heat will lose frompipe joint 11 and near tube surface thereof.For required insulation measure is provided, at the pipe fitting 20 of annotating a garden cylindricality of eachpipe joint 11 places installing of steam pipe string inside portion, this pipe fitting generally is contained between the endoporus 42 and end separately 41 and 45 ofpipe 12 in two butt joints, and covers the part of these two butt jointinner tube portions 41 and 45 inwalls.This cylindrical heat insulation pipe fitting generally is positioned at outside the flow channel, as depicted in figs. 1 and 2, so that flowing of tube fluid is not subjected to the obstruction of heat insulation pipe fitting 20.

Insertingpipe fitting 20 has a columniforminner casing 22, and its internal diameter is in the drawings with 44 expressions, and roughly suitable with the main pipe's 40 of interior pipe internal diameter 42, and the mobile of tube fluid generally is obstructed with regard to unlikely like this.Pipe fitting 20 also has a shell to be sleeved on one heart outside theinner casing 22, has anannular space 25 can supply filled heat insulating material between the two.The two ends ofshell 23 can link up with inner casing with the mode (for example soldering and sealing) of sealing, like thisannular space 25 formation thermal-protective coating that just can be evacuated.Heat insulation on the outer surface ofinner casing 22 inannular space 25, being wrapped in to play a part withreflection foil 26 and glass wire 29.Other available thermal insulating materials include, but is not limited to aluminium oxide silicon monoxide, calcium silicate, glass, mineral He Gao soil fibrous heat insulator; The thermal insulating material of powdery such as silicious marl, perlite,

Stone and silica sol santocel^*; The thermal insulating material of foamed thermal insulating material such as silicon, borate etc. and other multi-layered types.Reinject after annular space also can the be evacuated gas of low heat conductivity, argon gas for example is to improve the heat-shielding performance of inserting pipe fitting.Employed thermal insulating material should have high compressive strength, inserts the inside andoutside shell 22 of pipe fitting and 23 and preferably adopts thin walled structures to reduce heating loss.In addition, preferably have along circumferential and axial at the inwall ofshell 23 and to distribute, passannular space 25 and to prop up theconvex tendon 27 and 28 ofinner casing 22, so that inside andoutside shell 22 and 23 is separated from each other and to keepannular space 25 be desired minimum width.Theseconvex tendons 27 and 28 also can be protruding from the outer wall of inner casing, and it is more more convenient that this structure is inserted pipe fitting to assembling.But also can useglass wire 29 or other materials suitable, that have advantages of higher compressive strength to replaceconvex tendon 27 and 28.Annular space 25 can leave passage, so that be full of steam in the space, vapor condenses becomes water can play heat-blocking action, and stress that causes owing to vapor pressure when operation and the stress that causes expansion to cause owing to the temperature difference are reduced significantly.

Be preferably in to take measures around theshell 23 to reinforce as convex tendon or the sort ofcollar 30 as shown in fig. 1 and insert pipe fitting 20, and can reduce in 16 water of space and heat conduction circulation occurs, thecollar 30 stretches into thegap 16 of inserting between pipe fitting and the pipe joint.This reinforcingcollar 30 is preferably along circumferentially there being (for example 48)aperture 32, and the axis of these apertures is substantially parallel with the axis of pipeline section 10.The effect of aperture be insert pipe fitting and following pipeline section mouthful between cooperates and is sternly arranged when sewing, leakage fluid can be deflected from the inwall of pipe joint, flow away through aperture and can also reduce the heat dissipating capacity that thecollar 30 conducts.

The stagnant water that is accumulated in thespace 16 of inserting between pipe fitting 20 and thepipe joint 11 can play a part heat insulation.Because near the fluid passage in the gas-injecting pipe string, eliminating or reduce fluid as far as possible, the installation position that inserts pipe fitting 20 enters following pipeline section again by the lower end of inserting the space flow direction insertion pipe fitting between pipe fitting 20 and the pipe joint 11.Insert the lower end of pipe fitting and pass back in the passage of following pipeline section in order to prevent that any steam that entersspace 16 from flowing through downwards, play heat-blocking action so that stagnant water can be deposited in the space, inserting thelower end 24 of pipe fitting does tapered, the circumference on its inclined-plane closely contacts to form the cooperation of a sealing, as shown in Figure 1 with the horn mouth of 41 inboards, upper end of following pipeline section 10.Insert the pipe fitting lower end fixing can with the mode of stationary fit also/or combine withinterior pipe 12 along whole circumference with melting welding or brazing.Butinsert pipe fitting 20 also can make easy-to-dismount, example as shown in FIG. 3, the mode that employingscrew thread 33 combines between itslower end 24 and the interior pipe 12.Figure 4 shows that another scheme, reinforcing collar has apart 34 that extends radially out ofpassing space 16 to combine with screw thread 38 with pipe joint in this scheme.

Once measured, when two butt joints be about 30～40 feetpipeline section end 41 and 45 wherein the length of crested especially when less than 0.1 foot, will significantly increase less than 0.2 foot by the pipe joint dispersed heat.Therefore the ideal style of installing insertion pipe fitting 20 of the present invention is: the bell-mouthed length that it covers thepipeline section 10 of butt joint should have 0.1 foot at least, preferably covers 0.2 foot.Inserting the position of pipe fitting 20 in the pipe string preferably itsupper end 47 hangs down than the upper end ofpipe joint 11 slightly,pipe joint 11 is axially exceeding thepipeline section 10 of the projection that inserts pipe fittingupper end 47 above can preventing bump pipe fitting 20 and with its loss accidentally when docking with following pipeline section like this, or makes and insert the pipe fitting lower end and be adversely affected the cooperating of end 41 of following pipe.

Pipe end 41 and 45 can be the extension of interior pipe, also can be to make in addition and the oviduct that generally is referred to as " extension " that gets on of pipe in being soldered to.If the end of interior pipe 41 is different with 45 shapes, then be difficult to the insertion pipe fitting is linked 41 and 45 simultaneously, its possibility of result can be that it is improper with cooperating of following tube end 41 and cause vapo(u)r escape phenomenon above-mentioned.Among the figure 35 is according to a content of the present invention, between insertion pipe fitting andlast tube end 45, leave and be about 1/16 inch gap, its effect is will avoid on the one hand inserting the upper end of pipe fitting to contact withlast tube end 45 and the lower end and the closely cooperating of following tube end 41 of inserting pipe fitting are adversely affected, this gap can allow steam by enteringspace 16 on the other hand, but owing to be cooperating of sealing between the upper end 41 of the lower end of inserting pipe fitting and followingpipeline section 10, steam just congeals into stagnant water and can not flow inspace 16.

If the heat-blocking action atannular space 25 places mainly relies on the air clearance of one deck reflection foil and 0.020 inch, then this insertion pipe fitting will bear very high stress when annotating vapour.The main cause that produces stress is the thermal stress that causes owing to relative expansion between the high pressure of steam and the two-layer wall.This can be provided with two 0.015 inch highannular convex rib 27 of circle and 28 at the two ends of annular space, and can be wrapped with one deck glass wire of 1.5 inches long between two circle convex tendons, makes thatannular space 25 is kept under above-mentioned stress.Insert the pipe fitting shell around can burn-on one 3/4 inch the collar constituting reinforcingring 30, thereby further strengthen the double layer construction that inserts pipe fitting.

Though it is desirable adopting the double layer construction that increases thermal insulating material inannular space 25 to insert pipe fitting, adopt double layer construction to become best selection but the heat insulation benefit that is increased under certain conditions is perhaps also not enough, then can adopt the insertion pipe fitting 53 of the individual layer shown in Fig. 5.This insertion pipe fitting 53 is made up of a short tube that can cover twoinner tube portions 41 and 45 50, an extremity piece that combines with 41 54 and a collar 30.Insert the situation of pipe fitting as bilayer., should leave the gap between the upper end of pipe fitting 50 and theinner tube portion 45.

Insertion pipe fitting provided by the present invention can be used for reducing the radiation loss and the thermal shock of connector area, and keeps a level and smooth fluid passage simultaneously.

Some characteristic of the present invention can still can be given full play to its advantage under the condition of not using other characteristics of the present invention.Though embodiment of the present invention have been done the concrete application of detailed narration with the explanation principle of the invention, should be appreciated that also the present invention can be in the embodiment that adopts other under the condition of these principles.

Claims (10)

1, the piecing devices that are used for delivering vapor, this device be one by being no less than the serial connection pipeline that two pipeline sections are formed, one space and counterpart is connected on same axis device are arranged between the described pipeline section mouth of pipe and the mouth of pipe, the above-mentioned pipeline section of each root comprises pipe in an outer tube and, pipe is contained in one heart within the above-mentioned outer tube and keeps spacing with outer tube in above-mentioned, thus above-mentioned in annular space of formation between pipe and the outer tube; It is characterized in that: the two ends of the cylindrical tube of pipe are connected to above-mentioned outer dilator tube and with above-mentioned outer tube in above-mentioned, in the annular space thermal insulation apparatus can be set; The inner cylindrical channel that forms a delivering vapor of the cylindrical tube of pipe in above-mentioned, the end that columniform insertion pipe fitting is contained in above-mentioned two butt tube intersegmental parts and covers above-mentioned two pipeline sections; The device that at least one pipe end in above-mentioned insertion pipe fitting and the above-mentioned pipe end is connected; Above-mentioned insertion pipe fitting is made up of cylindrical internals and a cylindrical outer part, above-mentioned cylindrical outer part wraps in the outside of above-mentioned cylindrical internals, thereby have spacing to form an annular space between the two, the end of above-mentioned internals and outer part is the no radial clearance that connects together.

2, install according to claim 1, it is characterized in that: described insertion pipe fitting from above-mentioned two pipe ends extends to the other end vertically, and the pipe joint of two pipeline sections of above-mentioned connection then from above-mentioned two pipe ends extends to more than above-mentioned insertion pipe fitting the other end part vertically.

3, install according to claim 1, it is characterized in that: also comprise the thermal insulation apparatus that is arranged in the above-mentioned shape space.

4, install according to claim 1, it is characterized in that: described coupling device comprises a tapered end of described insertion pipe fitting, and its surface is combined surface with joining of a described pipe end and is in contact with one another.

5, device as claimed in claim 1, it is characterized in that: this device comprises that also a hoop is inserting the pipe fitting periphery and stretching into collar reinforcing device. in the above-mentioned space, and the above-mentioned collar comprises that to have one thereon at least substantially parallel with stream passageway in the interior pipe to wearing boring.

6, device according to claim 1 is characterized in that: comprise that also many convex tendons are distributed on the circumference of one of above-mentioned internals and outer part, above-mentioned convex tendon passes that above-mentioned annular space is stretched and above-mentioned internals reach another one in the outer part.

7, install according to claim 1, it is characterized in that described insertion pipe fitting is at least 0.1 foot to each pipe end depth of defilade along its length in above-mentioned two pipe ends.

8, install according to claim 1, it is characterized in that described insertion pipe fitting is at least 0.2 foot to each pipe end depth of defilade along its length in above-mentioned two pipe ends.

9, device according to claim 1 is characterized in that also comprising that one is stretched into reinforcing device. in the above-mentioned space from above-mentioned insertion pipe fitting.

10, install according to claim 1, it is characterized in that also comprising the device that stretches into above-mentioned space from above-mentioned insertion pipe fitting, purpose is to reduce the circulation that above-mentioned space inner product water is occurred.

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