CN112483011A - Plug-in type underground flexible continuous composite pipe connecting joint and connecting method - Google Patents
Plug-in type underground flexible continuous composite pipe connecting joint and connecting method Download PDFInfo
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- CN112483011A CN112483011A CN202011350418.7A CN202011350418A CN112483011A CN 112483011 A CN112483011 A CN 112483011A CN 202011350418 A CN202011350418 A CN 202011350418A CN 112483011 A CN112483011 A CN 112483011A
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- 239000002131 composite material Substances 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 47
- 230000003014 reinforcing effect Effects 0.000 claims description 22
- 238000003825 pressing Methods 0.000 claims description 11
- 238000003780 insertion Methods 0.000 claims description 7
- 230000037431 insertion Effects 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002332 oil field water Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/20—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
The invention discloses a plug-in type underground flexible continuous composite pipe connecting joint and a connecting method, the connecting joint comprises an upper connecting head, an outer sleeve, a locking ring, a movable joint and a lower connecting head, wherein the outer wall of the upper connecting head is provided with a locking ring groove and a limiting ring, the locking ring is coaxially sleeved at the locking ring groove, the movable joint is coaxially sleeved on the outer wall of the upper connecting head, one end of the movable joint is limited at the limiting ring, the movable joint is in threaded connection with the lower connecting head, the outer sleeve is coaxially sleeved on the outer side of the flexible continuous composite pipe, the flexible continuous composite pipe is coaxially sleeved on the outer side of one end, provided with the locking ring groove, of the upper connecting head, one end of the outer sleeve is arranged at the lower end position of the locking ring groove and used. The invention effectively solves the reliability of the connection between the flexible continuous composite pipe and the underground tool string, reduces the problem of salvage or overhaul caused by the separation of the connecting joint, and ensures the sealing problem of the pipe column in the underground high-temperature and high-pressure environment for a long time.
Description
Technical Field
The invention belongs to the technical field of oilfield water injection tools, and particularly relates to a plug-in type underground flexible continuous composite pipe connecting joint and a connecting method.
Background
Oilfield flooding is one of the most widely, effectively and economically increasing and stabilizing production measures in the oilfield development process. The water source comprises two parts, clear water is from underground water, produced water is from water removed after the crude oil in the stratum is produced, and the produced water contains oxygen and Ca2+、Mg2+、Ba2+、SO42-、HCO3-The scaling ions, sulfate reducing bacteria and saprophytic bacteria have strong corrosion performance, mainly point corrosion and under-scale corrosion. The oil field divides the oil field area into I, II and III corrosion areas according to the corrosivity of the produced water. At present, the domestic produced water reinjection wells generally adopt a coating anticorrosion process, the process is simple in construction, and the anticorrosion requirements of produced water reinjection wells of II and III corrosion areas of an oil field on water injection pipe columns are met. Aiming at a class I corrosion area, the service life of the process pipe column is only 3-5 years, and therefore research and test of a water injection process of the underground flexible composite continuous pipe are developed. However, the connection of the underground flexible composite continuous pipe and the underground tool string is a difficult point of the process pipe string, a connection joint (ZL201220197149. X) is designed in the early stage, the joint is in threaded connection, the joint is screwed up in a manner of screwing an oil pipe collar in a positive and negative way because a single underground flexible composite continuous pipe is very long and cannot rotate, and in the water injection process, the disconnection is easy to occur to cause the underground tool string to fall into the well, so that the salvage and even the overhaul are caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a plug-in type underground flexible continuous composite pipe connecting joint and a connecting method, and solves the problems that in the prior art, during the water injection process of the connecting joint, the joint is easy to be stripped, so that underground tools are connected in series and fall into a well, and the fishing and even overhaul are caused.
In order to solve the technical problem, the technical scheme of the invention is as follows: the utility model provides a plug-in type is flexible in succession compound union coupling in pit, includes connector, outer sleeve, catch, union and connector down, wherein goes up the connector outer wall and is provided with latch ring groove and spacing ring, the coaxial cover of catch is established in latch ring groove department, the coaxial suit of union is in last connector outer wall to union one end is spacing in spacing ring department, union and connector threaded connection down, the outer sleeve is coaxial suit in the flexible continuous compound union outside, and this flexible continuous compound union is coaxial suit in last connector sets up catch groove one end outside to outer sleeve one end is in catch groove lower extreme position with flexible continuous compound union buckle lock at last connector outer wall, the connector is down connected to the last connector other end.
Preferably, go up the connector outer wall and still be provided with cone structure, sealed arch, spacing recess and seal groove, wherein cone structure, locked ring groove, sealed arch, spacing recess, spacing ring and seal groove set gradually along last connector outer wall, the radial dimension that cone structure is close to the locked ring groove is less than sealed bellied radial dimension, and sealed bellied radial dimension is greater than spacing recess's radial dimension, and sealed bellied radial dimension is less than spacing ring's radial dimension.
Preferably, the radial dimension of the cone structure is gradually increased along with the direction close to the lock ring groove, wherein the maximum radial dimension of the cone structure is smaller than the radial dimension of the sealing protrusion, the flexible continuous composite pipe is coaxially sleeved on the outer wall of the cone structure, and the outer sleeve is coaxially sleeved on the outer wall of the flexible continuous composite pipe sleeved with the cone structure.
Preferably, the seal groove is a plurality of, and a plurality of seal grooves equidistant encircle and set up in last connector outer wall, and wherein seal groove department is provided with rubber seal.
Preferably, a gap is left between the inner wall of the locking ring and the outer wall of the limiting ring, and the outer diameter of the locking ring is smaller than the radial dimension of the sealing bulge.
Preferably, the inner wall of one end of the movable joint is provided with a joint limiting ring, wherein the joint limiting ring is matched with the limiting ring to limit the end part of the movable joint, the inner wall of the other end of the movable joint is provided with internal threads, and the lower end of the movable joint is connected with the upper end of the lower connector through threads.
Preferably, the lower connector is a cylinder structure with different diameters, wherein one end of the lower connector close to the upper connector is provided with an inserting hole, one end of the lower connector far away from the upper connector is provided with a through hole, the inserting hole and the through hole are communicated, the inner diameter of the inserting hole is larger than the outer diameter of the upper connector, the lower end of the upper connector is inserted into the lower connector, an external thread is arranged on the outer wall of one end of the lower connector close to the upper connector, the outer wall of the lower connector is connected with a loose joint in a threaded manner, one end of the lower connector far away from the upper connector is provided with an external thread of the lower connector.
Preferably, the upper connector is of a cylindrical structure with the same inner diameter, wherein the inner diameter of the upper connector is the same as that of the through hole.
Preferably, the connection method of the plug-in type downhole flexible continuous composite pipe connection joint comprises the following steps:
step 1) sleeving a movable joint into a position of a limiting ring from the upper end of an upper connector, and sleeving a locking ring into a locking ring groove from the upper end of the upper connector;
step 2) sleeving an outer sleeve from the lower end of the flexible continuous composite pipe, sleeving the outer sleeve at a position 3-5 m away from the lower end port of the flexible continuous composite pipe, then sleeving the lower end of the flexible continuous composite pipe into the outer wall of the upper end of the upper connector, penetrating a reinforcing layer of the flexible continuous composite pipe through a gap between a locking ring groove and a locking ring, then turning back the reinforcing layer of the flexible continuous composite pipe by 10-20 cm from the outside of the locking ring, straightening the reinforcing layer of the flexible continuous composite pipe along the natural trend and then fixing the reinforcing layer on the outer wall of the flexible continuous composite pipe;
step 3) sleeving the outer sleeve back to the lower end of a locking ring groove of the upper connector from a position 3-5 m away from the lower end port of the flexible continuous composite pipe, and pressing and buckling the outer sleeve by using a pressing and buckling machine to complete connection of the upper connector and the flexible continuous composite pipe;
step 4), connecting the lower end of the lower connector with an underground tool string;
and 5) completely inserting the lower end of the upper connector into the upper end of the lower connector, and connecting the inner wall of the lower end of the movable connector with the outer wall of the upper end of the lower connector in a threaded manner to realize the connection of the underground tool string and the flexible continuous composite pipe.
Compared with the prior art, the invention has the advantages that:
(1) the invention provides a plug-in type underground flexible continuous composite pipe connecting joint and a connecting method, which effectively solve the problem of reliability of connection between a flexible continuous composite pipe and an underground tool string, reduce the problem of salvage or overhaul caused by the disconnection of the connecting joint and ensure the sealing problem of a pipe column in an underground high-temperature and high-pressure environment for a long time;
(2) the flexible continuous composite pipe is sleeved on the upper connecting head, the reinforcing layer of the flexible continuous composite pipe penetrates through a gap between the locking ring groove and the locking ring, the reinforcing layer of the flexible continuous composite pipe is folded back for a certain distance from the outside of the locking ring, the reinforcing layer of the flexible continuous composite pipe is fixed on the outer wall of the flexible continuous composite pipe after being straightened along the natural direction, then the outer sleeve is returned to the lower end of the locking ring groove of the upper connecting head from the flexible continuous composite pipe, a pressing and buckling machine is adopted to press and buckle the outer part of the outer sleeve, the flexible continuous composite pipe is effectively connected with the upper connecting head, and the outer sleeve is utilized to press and buckle the flexible continuous composite pipe on the outer wall of the upper connecting head, so that the possibility of opening falling of the connecting head is;
(3) the lower end of the upper connector is hermetically connected with the lower connector, the outer wall of the lower end of the upper connector is sleeved with the movable connector, the inner wall of the movable connector is in threaded connection with the outer wall of the lower connector, and the lower end of the lower connector is in threaded connection with the underground tool string, so that the underground tool string is connected with the flexible continuous composite pipe, the sealing effect is good, and the connection reliability is high;
(4) the connecting joint structure has the advantages of simple design, safe and reliable use, good sealing performance, simple operation and high construction efficiency.
Drawings
FIG. 1 is a schematic structural diagram of a plug-in type downhole flexible continuous composite pipe joint according to the invention;
FIG. 2 is a schematic structural diagram of an upper connector of a plug-in type downhole flexible continuous composite pipe connector according to the present invention;
FIG. 3 is a schematic view of a lower connector structure of a plug-in type downhole flexible continuous composite pipe connector according to the present invention.
Description of the reference numerals
1. The device comprises an upper connector, a lower connector, an outer sleeve, a locking ring, a movable connector, a rubber sealing ring and a rubber sealing ring, wherein the upper connector 2 is connected with the outer sleeve, 3 is connected with the locking ring, 4 is connected with the movable connector, 5 is connected with the rubber sealing ring, 6 is connected;
1-1 parts of cone structures, 1-2 parts of lock ring grooves, 1-3 parts of limiting rings, 1-4 parts of sealing grooves, 1-5 parts of sealing bulges, 1-6 parts of limiting grooves;
4-1, a joint limiting ring;
6-1, an insertion hole, 6-2, an external thread of the lower connector, 6-3 and a through hole.
Detailed Description
The following describes embodiments of the present invention with reference to examples:
it should be noted that the structures, proportions, sizes, and other elements shown in the specification are included for the purpose of understanding and reading only, and are not intended to limit the scope of the invention, which is defined by the claims, and any modifications of the structures, changes in the proportions and adjustments of the sizes, without affecting the efficacy and attainment of the same.
In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
The upper end of each component is one end relatively close to the upper connector 1, and the lower end of each component is one end relatively close to the lower connector 6.
Example 1
As shown in figures 1-3, the invention discloses a plug-in type underground flexible continuous composite pipe connecting joint, which comprises an upper connecting joint 1, an outer sleeve 2, a locking ring 3, a movable joint 4 and a lower connecting joint 6, wherein the outer wall of the upper connecting joint 1 is provided with a locking ring groove 1-2 and a limiting ring 1-3, the locking ring 3 is coaxially sleeved at the locking ring groove 1-2, the movable joint 4 is coaxially sleeved at the outer wall of the upper connecting joint 1, one end of the movable joint 4 is limited at the limiting ring 1-3, the movable joint 4 is in threaded connection with the lower connecting joint 6, the outer sleeve 2 is coaxially sleeved at the outer side of a flexible continuous composite pipe, the flexible continuous composite pipe is coaxially sleeved at the outer side of one end of the upper connecting joint 1 provided with the locking ring groove 1-2, one end of the outer sleeve 2 is used for locking the flexible continuous composite pipe on the outer wall of, the other end of the upper connector 1 is connected with a lower connector 6.
Example 2
Preferably, as shown in fig. 2, the outer wall of the upper connector 1 is further provided with a cone structure 1-1, a sealing protrusion 1-5, a limiting groove 1-6 and a sealing groove 1-4, wherein the cone structure 1-1, the locking ring groove 1-2, the sealing protrusion 1-5, the limiting groove 1-6, the limiting ring 1-3 and the sealing groove 1-4 are sequentially arranged along the outer wall of the upper connector 1, the radial dimension of the cone structure 1-1 close to the locking ring groove 1-2 is smaller than the radial dimension of the sealing protrusion 1-5, the radial dimension of the sealing protrusion 1-5 is larger than the radial dimension of the limiting groove 1-6, and the radial dimension of the sealing protrusion 1-5 is smaller than the radial dimension of the limiting ring 1-3.
The locking ring groove 1-2 is arranged at the position of the lower end of the axial center of the upper connector 1 and is used for sleeving more flexible continuous composite pipes on the outer wall of the cone structure 1-1.
The limiting ring 1-3 is arranged at the position, close to the lower end, of the upper connector 1 in the axial direction, the lower end of the upper connector 1 is inserted into the lower connector 6, and the lower connector 6 is in threaded connection with the movable connector 4.
The sealing bulges 1-5 are used for limiting the port of the outer sleeve 2, and when the outer sleeve 2 is pressed by a button pressing machine, the port of the outer sleeve 2 is sleeved at the lower ends of the sealing bulges 1-5 or in the limiting grooves 1-6 and is limited by the steps of the sealing bulges 1-5.
The upper end of the limiting groove 1-6 is used for sleeving a port of the outer sleeve 2, and the lower end of the limiting groove 1-6 is used for sleeving a joint limiting ring 4-1 of the movable joint 4.
Example 3
Preferably, as shown in fig. 2, the radial dimension of the cone structure 1-1 gradually increases along the direction approaching the lock ring groove 1-2, wherein the maximum radial dimension of the cone structure 1-1 is smaller than the radial dimension of the sealing protrusion 1-5, the flexible continuous composite pipe is coaxially sleeved on the outer wall of the cone structure 1-1, and the outer sleeve 2 is coaxially sleeved on the outer wall of the flexible continuous composite pipe sleeved with the cone structure 1-1.
The cone structure 1-1 can be provided with threads or bulges to increase the friction between the flexible continuous composite pipe and the cone structure 1-1.
Preferably, as shown in fig. 2, the number of the sealing grooves 1 to 4 is multiple, the sealing grooves 1 to 4 are arranged around the outer wall of the upper connector 1 at equal intervals, and a rubber sealing ring 5 is arranged at the sealing groove 1 to 4.
The number of the sealing grooves 1-4 is 3, and the 3 sealing grooves 1-4 are arranged on the outer wall of the lower end of the upper connector 1 at equal intervals.
Example 4
Preferably, a gap is left between the inner wall of the locking ring 3 and the outer wall of the limiting ring 1-3, and the outer diameter of the locking ring 3 is smaller than the radial dimension of the sealing protrusion 1-5.
And a gap between the inner wall of the locking ring 3 and the outer wall of the limiting ring 1-3 is used for enabling the reinforcing layer of the flexible continuous composite pipe to penetrate through, and the end part of the reinforcing layer of the flexible continuous composite pipe is fixed at the limiting ring 1-3.
Preferably, as shown in fig. 1, a joint limiting ring 4-1 is arranged on an inner wall of one end of the movable joint 4, wherein the joint limiting ring 4-1 is matched with the limiting ring 1-3 to limit the end of the movable joint 4, an internal thread is arranged on an inner wall of the other end of the movable joint 4, and the lower end of the movable joint 4 is connected with the upper end of the lower connector 6 through a thread.
Example 5
Preferably, as shown in fig. 3, the lower connector 6 is a cylinder structure with different diameters, wherein one end of the lower connector 6 close to the upper connector 1 is provided with an insertion hole 6-1, one end of the lower connector 6 far from the upper connector 1 is provided with a through hole 6-3, the insertion hole 6-1 is communicated with the through hole 6-3, the inner diameter of the insertion hole 6-1 is larger than the outer diameter of the upper connector 1 and is used for inserting the lower end of the upper connector 1 into the lower connector 6, the outer wall of one end of the lower connector 6 close to the upper connector 1 is provided with an external thread, the outer wall of the lower connector 6 is in threaded connection with the movable connector 4, one end of the lower connector 6 far from the upper connector 1 is provided with an external thread 6-2 of the lower connector, and the.
Preferably, as shown in fig. 1, the upper connector 1 is a cylinder structure with an equal inner diameter, wherein the inner diameter of the upper connector 1 is the same as the inner diameter of the through hole 6-3.
Go up connector 1 and lower connector 6 and form after connecting and wait to lead to the warp, be favorable to follow-up construction.
Example 6
Preferably, the connection method of the plug-in type downhole flexible continuous composite pipe connection joint comprises the following steps:
step 1) sleeving a movable joint 4 into a position of a limit ring 1-3 from the upper end of an upper connector 1, and sleeving a locking ring 3 into a locking ring groove 1-2 from the upper end of the upper connector 1;
step 2) sleeving an outer sleeve 2 from the lower end of the flexible continuous composite pipe, sleeving the outer sleeve at a position 3-5 m away from the lower end port of the flexible continuous composite pipe, then sleeving the lower end of the flexible continuous composite pipe into the outer wall of the upper end of the upper connector 1, penetrating a reinforcing layer of the flexible continuous composite pipe through a gap between the locking ring groove 1-2 and the locking ring 3, then folding the reinforcing layer of the flexible continuous composite pipe back 10-20 cm from the locking ring 3, straightening the reinforcing layer of the flexible continuous composite pipe along the natural trend and fixing the reinforcing layer on the outer wall of the flexible continuous composite pipe;
step 3) sleeving the outer sleeve 2 back to the lower end of a locking ring groove 1-2 of the upper connector 1 from the position 3-5 m away from the lower end port of the flexible continuous composite pipe, and pressing and buckling the outer sleeve 2 by using a pressing and buckling machine to complete the connection of the upper connector 1 and the flexible continuous composite pipe;
step 4), connecting the lower end of the lower connector 6 with an underground tool string;
and 5) completely inserting the lower end of the upper connector 1 into the upper end of the lower connector 6, and connecting the inner wall of the lower end of the movable connector 4 with the outer wall of the upper end of the lower connector 6 in a threaded manner, so that the connection of the underground tool string and the flexible continuous composite pipe is realized.
The working principle of the invention is as follows:
as shown in figures 1-3, the invention comprises an upper connector 1, an outer sleeve 2, a lock ring 3, a movable joint 4, a rubber seal ring 5 and a lower connector 6, wherein a flexible continuous composite pipe is sleeved on a cone structure 1-1 of the upper connector 1, the lock ring 3 is arranged in a lock ring groove 1-2 of the upper connector 1, the outer sleeve 2 is sleeved outside the flexible continuous composite pipe, the connection between the flexible continuous composite pipe and the upper connector 1 is realized by adopting press-buckling locking, the movable joint 4 is sleeved on a limit ring 1-3 in the middle of the upper connector 1, the rubber seal ring 5 is arranged in a seal groove 1-4 of the lower end inserting surface of the upper connector 1, the lower end of the upper connector 1 is inserted into an inserting hole 6-1 at the upper end of the lower connector 6, the internal thread of the movable joint 4 is in threaded connection with the external thread at the upper end of the, forming the underground flexible composite continuous pipe water injection process pipe column.
The specific connection steps of the invention are as follows:
step 1: sleeving the movable joint 4 into the position of the limiting ring 1-3 from the upper end of the upper connector 1, and sleeving the locking ring 3 into the locking ring groove 1-2 from the upper end of the upper connector 1;
step 2: sleeving an outer sleeve 2 from the lower end of a flexible continuous composite pipe, sleeving the outer sleeve at a position 3-5 m away from the lower end port of the flexible continuous composite pipe, sleeving the flexible continuous composite pipe into a cone structure 1-1 of an upper connector 1, penetrating a reinforcing layer of the flexible continuous composite pipe through a locking ring groove 1-2 and a locking ring 3, turning back 20cm from the locking ring 3, straightening along the reinforcing layer naturally, and fixing the reinforcing layer on the outer wall of the flexible continuous composite pipe by using an adhesive tape;
and step 3: sleeving the outer sleeve 2 from the position 3-5 m away from the lower end port of the flexible continuous composite pipe to the position matched with the cone structure 1-1 of the upper connector 1, sleeving the lower end port of the outer sleeve 2 at the position of the limiting groove 1-6, and pressing and buckling the outer sleeve 2 by adopting a pressing and buckling machine to complete the connection of the upper connector 1 and the flexible continuous composite pipe;
and 4, step 4: the external thread 6-2 at the lower end of the lower connector 6 is in threaded connection with the internal thread at the upper end of the downhole tool string;
and 5: the method comprises the steps of firstly installing a rubber sealing ring 5 in a sealing groove 1-4 of an insertion surface at the lower end of an upper connector 1, then completely inserting the lower end of the upper connector 1 into an insertion hole 6-1 at the upper end of a lower connector 6, and screwing internal threads at the lower end of a movable connector 4 on external threads at the upper end of the lower connector 6 to realize the connection of an underground tool string and an underground flexible composite continuous pipe.
The invention provides a plug-in type underground flexible continuous composite pipe connecting joint and a connecting method, which effectively solve the problem of reliability of connection of a flexible continuous composite pipe and an underground tool string, reduce the problem of salvage or overhaul caused by the fact that a connecting joint is disconnected and ensure the sealing problem of a pipe column in an underground high-temperature high-pressure environment for a long time.
The flexible continuous composite pipe is sleeved on the upper connecting head, the reinforcing layer of the flexible continuous composite pipe penetrates through a gap between the locking ring groove and the locking ring, the reinforcing layer of the flexible continuous composite pipe is folded back for a certain distance from the outside of the locking ring, the reinforcing layer of the flexible continuous composite pipe is fixed on the outer wall of the flexible continuous composite pipe after being straightened along the natural direction, then the outer sleeve is returned to the lower end of the locking ring groove of the upper connecting head from the flexible continuous composite pipe, a pressing and buckling machine is adopted to press and buckle the outer part of the outer sleeve, the flexible continuous composite pipe is effectively connected with the upper connecting head, and the outer sleeve is utilized to press and buckle the flexible continuous composite pipe on the outer wall of the upper connecting head, so that the possibility of opening falling of the connecting head is.
The lower end of the upper connector is hermetically connected with the lower connector, the outer wall of the lower end of the upper connector is sleeved with the movable connector, the inner wall of the movable connector is in threaded connection with the outer wall of the lower connector, and the lower end of the lower connector is in threaded connection with the underground tool string, so that the underground tool string is connected with the flexible continuous composite pipe, and the sealing effect is good and the connection reliability is high.
The connecting joint structure has the advantages of simple design, safe and reliable use, good sealing performance, simple operation and high construction efficiency.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (9)
1. The utility model provides a flexible continuous compound union coupling in plug-in type pit which characterized in that: the flexible continuous composite pipe comprises an upper connector (1), an outer sleeve (2), a locking ring (3), a movable joint (4) and a lower connector (6), wherein a locking ring groove (1-2) and a limiting ring (1-3) are arranged on the outer wall of the upper connector (1), the locking ring (3) is coaxially sleeved at the locking ring groove (1-2), the movable joint (4) is coaxially sleeved on the outer wall of the upper connector (1), one end of the movable joint (4) is limited at the limiting ring (1-3), the movable joint (4) is in threaded connection with the lower connector (6), the outer sleeve (2) is coaxially sleeved on the outer side of the flexible continuous composite pipe, the flexible continuous composite pipe is coaxially sleeved on the outer side of one end of the upper connector (1) provided with the locking ring groove (1-2), and one end of the outer sleeve (2) is arranged at the lower end of the locking ring groove (1-2) to lock the outer wall of the upper connector, the other end of the upper connector (1) is connected with a lower connector (6).
2. The plug-in type downhole flexible continuous composite pipe joint according to claim 1, wherein: the outer wall of the upper connector (1) is also provided with a cone structure (1-1), a sealing bulge (1-5), a limiting groove (1-6) and a sealing groove (1-4), wherein the cone structure (1-1), the lock ring groove (1-2), the sealing bulge (1-5), the limiting groove (1-6), the limiting ring (1-3) and the sealing groove (1-4) are sequentially arranged along the outer wall of the upper connector (1), the radial dimension of the cone structure (1-1) close to the lock ring groove (1-2) is smaller than that of the sealing bulge (1-5), the radial dimension of the sealing bulge (1-5) is larger than that of the limiting groove (1-6), and the radial dimension of the sealing bulge (1-5) is smaller than that of the limiting ring (1-3).
3. The plug-in type downhole flexible continuous composite pipe joint according to claim 1, wherein: the radial size of the cone structure (1-1) is gradually increased along the direction close to the lock ring groove (1-2), wherein the maximum radial size of the cone structure (1-1) is smaller than the radial size of the sealing bulge (1-5), the flexible continuous composite pipe is coaxially sleeved on the outer wall of the cone structure (1-1), and the outer sleeve (2) is coaxially sleeved on the outer wall of the flexible continuous composite pipe sleeved with the cone structure (1-1).
4. The plug-in type downhole flexible continuous composite pipe joint according to claim 1, wherein: the sealing grooves (1-4) are multiple, the sealing grooves (1-4) are arranged on the outer wall of the upper connector (1) in an encircling mode at equal intervals, and rubber sealing rings (5) are arranged at the positions of the sealing grooves (1-4).
5. The plug-in type downhole flexible continuous composite pipe joint according to claim 2, wherein: a gap is reserved between the inner wall of the locking ring (3) and the outer wall of the limiting ring (1-3), and the outer diameter of the locking ring (3) is smaller than the radial size of the sealing bulge (1-5).
6. The plug-in type downhole flexible continuous composite pipe joint according to claim 1, wherein: the inner wall of one end of the movable joint (4) is provided with a joint limiting ring (4-1), wherein the joint limiting ring (4-1) is matched with the limiting ring (1-3) to limit the end part of the movable joint (4), the inner wall of the other end of the movable joint (4) is provided with an internal thread, and the lower end of the movable joint (4) is connected with the upper end of the lower connector (6) through a thread.
7. The plug-in type downhole flexible continuous composite pipe joint according to claim 1, wherein: the lower connector (6) is a cylinder structure with different diameters, wherein one end of the lower connector (6) close to the upper connector (1) is provided with an inserting hole (6-1), wherein, one end of the lower connector (6) far away from the upper connector (1) is provided with a through hole (6-3), the inserting hole (6-1) is communicated with the through hole (6-3), the inner diameter of the insertion hole (6-1) is larger than the outer diameter of the upper connector (1), is used for inserting the lower end of the upper connector (1) into the lower connector (6), the outer wall of one end of the lower connector (6) close to the upper connector (1) is provided with external threads, wherein the outer wall of the lower connector (6) is in threaded connection with the movable connector (4), one end, away from the upper connector (1), of the lower connector (6) is provided with a lower connector external thread (6-2), and the lower connector external thread (6-2) is used for being connected with an underground tool string.
8. The plug-in type downhole flexible continuous composite pipe joint according to claim 7, wherein: the upper connector (1) is of a cylindrical structure with the same inner diameter, wherein the inner diameter of the upper connector (1) is the same as that of the through hole (6-3).
9. A connection method of a plug-in type downhole flexible continuous composite pipe connection joint according to any one of claims 1 to 8, characterized by comprising the following steps:
step 1), sleeving a movable joint (4) into a limiting ring (1-3) from the upper end of an upper connector (1), and sleeving a locking ring (3) into a locking ring groove (1-2) from the upper end of the upper connector (1);
step 2), an outer sleeve (2) is sleeved from the lower end of the flexible continuous composite pipe and is sleeved at a position 3-5 m away from the lower end port of the flexible continuous composite pipe, then the lower end of the flexible continuous composite pipe is sleeved on the outer wall of the upper end of the upper connector (1), a reinforcing layer of the flexible continuous composite pipe penetrates through a gap between the locking ring groove (1-2) and the locking ring (3), the reinforcing layer of the flexible continuous composite pipe is folded back by 10-20 cm from the outside of the locking ring (3), and the reinforcing layer of the flexible continuous composite pipe is fixed on the outer wall of the flexible continuous composite pipe after being straightened along the natural trend;
step 3), sleeving the outer sleeve (2) back to the lower end of the lock ring groove (1-2) of the upper connector (1) from the position 3-5 m away from the lower end port of the flexible continuous composite pipe, and pressing and buckling the outer sleeve (2) by using a pressing and buckling machine to complete the connection of the upper connector (1) and the flexible continuous composite pipe;
step 4), connecting the lower end of the lower connector (6) with an underground tool string;
and 5) completely inserting the lower end of the upper connector (1) into the upper end of the lower connector (6), and connecting the inner wall of the lower end of the movable connector (4) with the outer wall of the upper end of the lower connector (6) in a threaded manner, so that the connection of the underground tool string and the flexible continuous composite pipe is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011350418.7A CN112483011A (en) | 2020-11-26 | 2020-11-26 | Plug-in type underground flexible continuous composite pipe connecting joint and connecting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011350418.7A CN112483011A (en) | 2020-11-26 | 2020-11-26 | Plug-in type underground flexible continuous composite pipe connecting joint and connecting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112483011A true CN112483011A (en) | 2021-03-12 |
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|---|---|---|---|
| CN202011350418.7A Pending CN112483011A (en) | 2020-11-26 | 2020-11-26 | Plug-in type underground flexible continuous composite pipe connecting joint and connecting method |
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| CN (1) | CN112483011A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114087444A (en) * | 2021-09-30 | 2022-02-25 | 嘉兴迈思特管件制造有限公司 | Joint structure for flexible pipeline of wind generating set |
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| CN114087444A (en) * | 2021-09-30 | 2022-02-25 | 嘉兴迈思特管件制造有限公司 | Joint structure for flexible pipeline of wind generating set |
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Application publication date: 20210312 |