CN118959736B - A threaded connection method and threaded connection piece for thin-walled geothermal buried pipe - Google Patents
A threaded connection method and threaded connection piece for thin-walled geothermal buried pipe Download PDFInfo
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- CN118959736B CN118959736B CN202411433152.0A CN202411433152A CN118959736B CN 118959736 B CN118959736 B CN 118959736B CN 202411433152 A CN202411433152 A CN 202411433152A CN 118959736 B CN118959736 B CN 118959736B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 25
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 23
- 210000001503 joint Anatomy 0.000 claims abstract description 22
- 239000003921 oil Substances 0.000 claims abstract description 21
- 230000000712 assembly Effects 0.000 claims description 14
- 238000000429 assembly Methods 0.000 claims description 14
- 238000013461 design Methods 0.000 claims description 2
- 230000000670 limiting effect Effects 0.000 claims description 2
- 230000003044 adaptive effect Effects 0.000 claims 2
- 238000012856 packing Methods 0.000 claims 1
- 230000009471 action Effects 0.000 abstract description 11
- 238000001125 extrusion Methods 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000015572 biosynthetic process Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 4
- 238000002347 injection Methods 0.000 abstract description 4
- 239000007924 injection Substances 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 101000959878 Xenopus laevis Apoptosis inhibitor 5-B Proteins 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000008236 heating water Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000003209 petroleum derivative Substances 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on, or into, one of the joint parts
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Electric Cable Installation (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a threaded connection method and a threaded connection piece of a thin-wall geothermal buried pipe, which relate to the technical field of geothermal injection and production well development and comprise a left buried pipe and a right buried pipe, wherein the threaded connection piece is in threaded connection with the outer part of a butt joint end of the left buried pipe and the right buried pipe, an annular insert can continuously move outwards and is inserted and abutted against the inner part of an annular groove under the action of oil pressure, meanwhile, the extrusion force of the annular insert to the annular groove is gradually increased under the continuous action of the oil pressure, so that the stability of connection between a ring sealing area of the left buried pipe (right buried pipe) and the threaded connection piece is further improved, hydraulic oil in a connection piece system can be self-adaptively expanded under the geothermal effect when stratum geothermal occurs, the self-adaptive extrusion type protection effect is generated with the ring sealing area after expansion, and finally, the weak ring sealing area of the left buried pipe (right buried pipe) can be also subjected to the tightening effect of self-adaptive change along with the formation pressure when geothermal occurs.
Description
Technical Field
The invention relates to the technical field of geothermal injection well development, in particular to a threaded connection method and a threaded connection piece of a thin-wall geothermal buried pipe.
Background
The geothermal resource of China is widely distributed and rich in reserves, and the geothermal energy has the characteristics of green, low carbon, continuous and stable. The geothermal energy is reasonably developed, the high-efficiency utilization of renewable energy is realized, and the method has great significance for energy conservation and emission reduction in China, improvement of the atmospheric environment and solving of the energy safety problem. In particular, for the middle-deep geothermal energy with the depth of 1-3 km and the formation temperature of 50-100 ℃, the heat is mainly from the decay of radioactive elements in the earth center and the heat energy converted from potential energy when the earth is formed, compared with the shallow geothermal energy, the geothermal energy has the characteristics of larger depth, higher temperature, larger stored heat and more continuous stability, and the geothermal buried pipeline is a heat energy source channel for developing geothermal heat, so the geothermal buried pipeline has the advantages of good economy, high cost performance, high formation heat exchange efficiency and the like, and the geothermal buried pipeline has the advantages of low yield strength and thin wall.
The existing buried pipe threaded connection has the following main problems:
1. The BC buttress thread which is connected by the API-5B standard thread for petroleum and natural gas exploitation is generally adopted when the geothermal buried pipe is in butt joint, and the BC buttress thread has the advantages of high connection strength and good anti-buckling property, but in the production stage of a geothermal injection and production well, the weaker thread ring sealing area of the geothermal buried pipe can be under an abnormally high stratum pressure system (because differential pressure exists between strata, the pressure of an upper stratum and a lower stratum can generate inward concave deformation when the inner weak ring sealing area is extruded due to the fact that the inner extrusion force is generated on a threaded connecting piece through the geothermal buried pipe, the thread is tripped, the thread failure and the ring sealing failure are caused, the thread failure comprises the tripping phenomenon, so that external pressure leakage is caused, stratum water enters into a production sleeve to pollute geothermal heating water, and the geothermal well is damaged and cannot be produced.
2. Besides the damage of the buried pipe connecting screw thread caused by the underground abnormal high-pressure stratum pressure, the geothermal phenomenon can cause the problem of the buried pipe connecting screw thread, the closer the decay position of the radioactive element is to the ground, the higher the stratum temperature is, the temperature of the deep geothermal energy stratum with the depth of 1-3 km can reach 100 ℃, the geothermal pipe is generally made of metal, the thermal expansion of the metal is gradually accumulated under the long-term underground high-pressure and high-temperature environment, the screw thread failure phenomenon can also occur in a weaker screw thread ring sealing area, and a series of chain reactions are further initiated to cause production interruption.
Aiming at the problems, innovative design is urgently needed on the basis of the original thin-wall geothermal buried pipe threaded connection piece.
Disclosure of Invention
The technical scheme of the invention aims at solving the technical problem that the prior art is too single, provides a solution which is obviously different from the prior art, and particularly aims to provide a threaded connection method and a threaded connection piece for thin-wall geothermal buried pipes, so as to solve the problems that the prior art generally adopts BC buttress threads which are in threaded connection with API-5B standard for developing petroleum and natural gas when the geothermal buried pipes are butted, and the method has the advantages of high connection strength and good anti-galling property, but in the production stage of geothermal injection and production wells, a weak threaded ring sealing area of the buried pipes can generate a phenomenon that threads fail and trip under an abnormal high-pressure stratum pressure system, thereby causing external pressure leakage, causing stratum water to enter into production casings to pollute geothermal heating water, and causing geothermal well damage and impossible production.
The technical scheme is that the threaded connecting piece for the thin-wall geothermal buried pipe comprises a left buried pipe and a right buried pipe, wherein the threaded connecting pieces are connected to the outer parts of butt joint ends of the left buried pipe and the right buried pipe in a threaded mode, first annular grooves are formed in the inner parts of opposite ends of the two threaded connecting pieces, annular butt joint pieces are arranged on the left buried pipe and the right buried pipe, two groups of self-adaptive tightening assemblies are sequentially arranged in annular sealing areas where the left buried pipe and the right buried pipe are connected with the threaded connecting pieces from inside to outside, and self-adaptive abutting assemblies are arranged between inner ports of the left buried pipe and the right buried pipe and the threaded connecting pieces.
Preferably, through holes penetrating through two ends are formed in the center of the annular butt joint piece at equal angles, the two ends of the annular butt joint piece are respectively arranged in the two first annular grooves in a sliding mode, and hydraulic oil is filled in the first annular grooves.
Preferably, the two groups of self-adaptive tightening assemblies are arranged in a space dislocation mode, and the two groups of self-adaptive tightening assemblies are combined to seal the transverse space of the ring sealing area.
Preferably, the self-adaptive tightening assembly comprises an arc groove, an arc stop block, a cavity groove, a clamping block, an arc groove and a clamping groove, the arc groove is formed in the threaded connection piece, the arc stop block is clamped in the arc groove in a sliding mode, the arc groove is formed in the left buried pipe and the right buried pipe in the left clamping mode, the end portion of the arc stop block penetrates through the threaded connection piece to be inserted into the arc groove, the cavity groove is formed in the arc stop block, the clamping block is symmetrically arranged in the cavity groove in a sliding mode, the clamping grooves matched with the two clamping blocks in an inserting mode are symmetrically formed in the arc groove, and the arc groove is in through connection with the first annular groove.
Preferably, the arc-shaped groove is in through connection with the cavity groove between the two clamping blocks, and the upper surfaces of the clamping grooves and the clamping blocks are designed to be inclined planes.
Preferably, the self-adaptive abutting assembly comprises an annular groove, a second annular groove and an annular insert block, the butt joint ports of the left buried pipe, the right buried pipe and the threaded connecting piece are provided with the annular groove, the threaded connecting piece and the butt joint ends of the left buried pipe and the right buried pipe are provided with the second annular groove, the annular insert block is slidably arranged in the second annular groove, the end part of the annular insert block is matched and corresponds to the annular groove, and the second annular groove is in through connection with the first annular groove.
A threaded connection method of a thin-wall geothermal buried pipe comprises the following steps:
S1, respectively arranging a left buried pipe and a right buried pipe at the side of two threaded connecting pieces, then gradually sleeving the threaded connecting pieces on the outer wall of the left buried pipe by rotating the threaded connecting pieces, and gradually extruding and pushing the end part of the left buried pipe inwards to the arc-shaped stop block along with the rotation, so that the arc-shaped stop block pushes hydraulic oil in the arc-shaped groove into the first annular groove;
S2, because the first annular groove is filled with hydraulic oil, the hydraulic oil filled into the first annular groove enters the second annular groove in the form of oil pressure and pushes the annular insert which is not limited temporarily, so that the annular insert gradually extends out of the threaded connecting piece;
S3, the threaded connecting piece is gradually and rotatably sleeved on the left buried pipe, when the left buried pipe is completely positioned, the annular groove is just sleeved at the outer end of the annular inserting block, meanwhile, the arc-shaped stop block is just corresponding to the arc-shaped groove, the left buried pipe is connected with the threaded connecting piece, then the threaded connecting piece on the right side is rotated and gradually pushes the right buried pipe into the threaded connecting piece, meanwhile, the connection process of the right buried pipe and the threaded connecting piece is completed according to the principle, and the connection process of the left buried pipe and the right buried pipe and the threaded connecting piece has the advantages that time and labor are saved in installation, and when the traditional left and right pipes are connected through the connecting piece, the left and right pipes are required to be lifted simultaneously, and a large amount of manpower, material resources and mechanical equipment are required for butt joint of the left and right pipes to the connecting piece in a rotating mode.
Compared with the prior art, the invention has the beneficial effects that:
1. In the installation aspect, the two threaded connectors which are connected in a rotating way are adopted as the connector body, when the connectors are connected, the left buried pipe and the right buried pipe can be connected in sequence, meanwhile, when the connectors are connected, the connectors are not required to be rotated, and the butt joint of the buried pipes on two sides can be realized, so that compared with the traditional connectors, the butt joint of the buried pipes is time-saving and labor-saving;
2. Formation abnormal high pressure phenomenon and geothermal phenomenon cause damage to the annular sealing area (annular sealing area protection aspect): when the pipeline is installed and put into use, because differential pressure exists between strata, the pressure of the two strata can generate internal extrusion force to the threaded connecting pieces through the buried pipes, namely, the differential pressure of the strata can generate inward acting force to the two threaded connecting pieces through the left buried pipe and the right buried pipe, after the inward acting force is received, the two threaded connecting pieces gradually approach and squeeze hydraulic oil in the first annular groove through the annular butt joint piece, when the hydraulic oil in the first annular groove is pressurized, the hydraulic oil can simultaneously fill oil into a plurality of arc grooves and a second annular groove, after the hydraulic oil is received, the pressure in the arc grooves is gradually increased and the arc-shaped stop blocks are pushed outwards, so that the arc-shaped stop blocks gradually enter the arc-shaped grooves and are clamped with the arc-shaped grooves, meanwhile, as the oil pressure continues to be injected, the arc-shaped stop blocks cannot move continuously, so that the oil liquid can generate outward expansion thrust to the two clamping blocks, the two clamping blocks gradually enter corresponding clamping grooves, the inclined surfaces of the clamping blocks gradually contact and abut against the inclined surfaces of the clamping grooves after entering the clamping grooves, and as the oil liquid gradually pressurizes the clamping blocks, the extrusion force generated by the inclined surfaces of the clamping blocks on the inclined surfaces of the clamping grooves is larger and larger, so that the annular sealing area with weaker left buried pipe (right buried pipe) is subjected to self-adaptive change tightening action along with the formation pressure, and meanwhile, as shown in the figures, the arc-shaped stop blocks are distributed in equal angles and in a space closed mode, namely, the integral surrounding is realized by the combination of a plurality of groups of arc-shaped stop blocks in an annular section, the annular sealing area which is weaker for the left buried pipe (the right buried pipe) can be subjected to the tightening effect which is adaptively changed along with the formation pressure.
Meanwhile, when oil is injected into the second annular groove, the annular insert can continuously move outwards and be inserted into the annular groove under the action of oil pressure, meanwhile, the extrusion force of the annular insert to the annular groove is gradually increased under the continuous action of oil pressure, so that the stability of connection between a left buried pipe (right buried pipe) annular sealing area and a threaded connecting piece is further improved, expansion can be self-adaptively generated by hydraulic oil in the connecting piece system under the action of geothermal energy when ground geothermal energy happens, self-adaptive extrusion type protection effect can be generated on the annular sealing area after expansion, and finally, the annular sealing area which is weak to the left buried pipe (right buried pipe) can be subjected to tightening action of self-adaptive change along with the pressure of the ground energy when geothermal energy happens.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a front cross-sectional structure of the present invention;
FIG. 3 is a schematic view of the annular docking member of the present invention;
FIG. 4 is a schematic view of the spatial distribution structure of the arc-shaped block of the present invention;
FIG. 5 is a schematic view of the structure of the annular insert block of the present invention;
FIG. 6 is a schematic view of the arc stop of the present invention;
FIG. 7 is an enlarged schematic view of the structure of FIG. 2A according to the present invention;
FIG. 8 is a schematic view of the structure of the arc stop of the present invention after being pressed and changed;
FIG. 9 is an enlarged schematic view of the structure of FIG. 2B according to the present invention;
Fig. 10 is an enlarged view of the structure of fig. 4 at C according to the present invention.
1, A left buried pipe; 2, right buried pipes, 3, threaded connectors, 31, first annular grooves, 32, annular butt-joint parts, 4, arc-shaped grooves, 41, arc-shaped stop blocks, 42, cavity grooves, 43, clamping blocks, 44, arc-shaped grooves, 45, clamping grooves, 5, annular grooves, 51, second annular grooves, 52 and annular plug blocks.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-10, the invention provides a technical scheme that the threaded connector for thin-wall geothermal buried pipes comprises a left buried pipe 1 and a right buried pipe 2, wherein the threaded connectors 3 are connected to the outer parts of butt ends of the left buried pipe 1 and the right buried pipe 2 in a threaded manner, first annular grooves 31 are formed in the inner parts of opposite ends of the two threaded connectors 3, annular butt connectors 32 are arranged on the left buried pipe 1 and the right buried pipe 2, two groups of self-adaptive tightening assemblies are sequentially arranged in annular sealing areas where the left buried pipe 1 and the right buried pipe 2 are connected with the threaded connectors 3 from inside to outside, and self-adaptive abutting assemblies are arranged between inner ports of the left buried pipe 1 and the right buried pipe 2 and the threaded connectors 3.
Through holes penetrating through two ends are formed in the center of the annular butt joint piece 32 at equal angles, the two ends of the annular butt joint piece 32 are respectively arranged inside the two first annular grooves 31 in a sliding mode, and the inside of the first annular grooves 31 is filled with hydraulic oil.
The two groups of self-adaptive tightening assemblies are arranged in a space dislocation mode, and the two groups of self-adaptive tightening assemblies are combined to seal the transverse space of the ring sealing area.
The self-adaptive tightening assembly comprises an arc groove 4, an arc stop block 41, a cavity groove 42, a clamping block 43, an arc groove 44 and a clamping groove 45, wherein the arc groove 4 is formed in the threaded connecting piece 3, the arc stop block 41 is clamped and slid in the arc groove 4, the arc groove 44 is formed in the left buried pipe 1 and the right buried pipe 2, the end portion of the arc stop block 41 penetrates through the threaded connecting piece 3 to be inserted into the arc groove 44, the cavity groove 42 is formed in the arc stop block 41, the clamping groove 45 matched with the two clamping blocks 43 in an inserted mode is symmetrically formed in the cavity groove 42, and the arc groove 4 is in through connection with the first annular groove 31.
The arc groove 4 is connected with the cavity groove 42 between the two clamping blocks 43 in a penetrating way, and the upper surfaces of the clamping grooves 45 and the clamping blocks 43 are designed to be inclined planes.
The self-adaptive abutting assembly comprises an annular groove 5, a second annular groove 51 and an annular insert 52, the annular groove 5 is formed in the butt joint ports of the left buried pipe 1, the right buried pipe 2 and the threaded connecting piece 3, the second annular groove 51 is formed in the butt joint ends of the threaded connecting piece 3, the left buried pipe 1 and the right buried pipe 2, the annular insert 52 is slidably arranged in the second annular groove 51, the end portion of the annular insert 52 is matched with the annular groove 5, and the second annular groove 51 is in through connection with the first annular groove 31.
A threaded connection method of a thin-wall geothermal buried pipe comprises the following steps:
s1, respectively arranging the left buried pipe 1 and the right buried pipe 2 at the side of two threaded connectors 3, then gradually sleeving the threaded connectors 3 on the outer wall of the left buried pipe 1 by rotating the threaded connectors 3, and gradually extruding and pushing the arc-shaped stop block 41 inwards along with the rotation of the end part of the left buried pipe 1, so that the arc-shaped stop block 41 pushes hydraulic oil in the arc-shaped groove 4 into the first annular groove 31;
S2, because the first annular groove 31 is filled with hydraulic oil, the hydraulic oil filled into the first annular groove 31 enters the second annular groove 51 in the form of oil pressure and pushes the annular insert 52 which is not limited temporarily, so that the annular insert 52 gradually protrudes from the interior of the threaded connector 3;
S3, next, the threaded connector 3 is gradually sleeved on the left buried pipe 1 in a rotating way, when the left buried pipe 1 is completely positioned, the annular groove 5 is just sleeved at the outer end of the annular insertion block 52, meanwhile, the arc-shaped stop block 41 is just corresponding to the arc-shaped groove 44, the left buried pipe 1 is connected with the threaded connector 3, then the threaded connector 3 on the right side is rotated and the right buried pipe 2 is gradually pushed into the threaded connector 3, meanwhile, the connection process of the right buried pipe 2 and the threaded connector 3 is completed according to the principle, and the connection process of the left buried pipe 1 and the right buried pipe 2 and the threaded connector 3 has the advantages that time and labor are saved in installation, and when the traditional left and right pipes are connected through the connector, the left and right pipes are required to be lifted simultaneously, and the left and right pipes are required to be rotated simultaneously to be butted against the connector, and a large amount of manpower and material resources and mechanical equipment are required.
In the operation principle, when the threaded connection of the thin-wall geothermal buried pipe is used, firstly, as shown in fig. 1 and 2, the left buried pipe 1 and the right buried pipe 2 are respectively arranged at the side sides of the two threaded connection pieces 3, then the threaded connection pieces 3 are gradually sleeved on the outer wall of the left buried pipe 1 by rotating the threaded connection pieces 3, and the end part of the left buried pipe 1 gradually generates inward extrusion pushing action on the arc-shaped stop 41 along with the rotation, so that the arc-shaped stop 41 pushes hydraulic oil in the arc-shaped groove 4 into the first annular groove 31, but because the first annular groove 31 is filled with hydraulic oil, the hydraulic oil filled into the first annular groove 31 enters the second annular groove 51 in the form of oil pressure and pushes the annular insertion block 52 which is not subjected to limiting action temporarily, so that the annular insertion block 52 gradually extends out of the interior of the threaded connection pieces 3.
Next, the threaded connection 3 is gradually rotated around the left buried pipe 1, the annular groove 5 is just sleeved on the outer end of the annular insert 52 when the left buried pipe 1 is completely positioned, meanwhile, the arc-shaped stop 41 just corresponds to the arc-shaped groove 44, the connection of the left buried pipe 1 and the threaded connection 3 is completed, then the threaded connection 3 on the right side is rotated and the right buried pipe 2 is gradually pushed into the threaded connection, and meanwhile, the connection of the right buried pipe 2 and the threaded connection 3 is completed according to the principle described above.
The connecting process of the left buried pipe 1 and the right buried pipe 2 and the threaded connecting piece 3 has the advantages that time and labor are saved in installation, and when the traditional left and right pipes are connected through the connecting piece, the left and right pipes are required to be lifted at the same time and are required to be butted by rotating the left and right pipes at the same time due to the fact that the connecting piece is a fixing piece, and a large amount of manpower, material resources and mechanical equipment are required.
When the pipeline is installed and put into use, because differential pressure exists between strata, the pressure of the two strata can generate internal extrusion force to the threaded connectors through the buried pipes, namely, the differential pressure of the strata can generate inward acting force to the two threaded connectors 3 through the left buried pipe 1 and the right buried pipe 2, when the inward acting force is received, as shown in fig. 2, the two threaded connectors 3 gradually approach to and extrude hydraulic oil in the first annular groove 31 through the annular butt joint part 32, when the hydraulic oil in the first annular groove 31 is subjected to pressure, the oil is injected into the arc grooves 4 and the second annular groove 51 at the same time, after the oil is received, the internal pressure of the arc grooves 4 is gradually increased and the arc stop block 41 is pushed outwards, so that the arc stop block 41 gradually enters the arc groove 44 and is clamped with the arc stop block, meanwhile, as the oil pressure continues to be injected, the arc-shaped stop blocks 41 cannot move continuously, so that the oil liquid can generate outward expansion thrust to the two clamping blocks 43, so that the two clamping blocks 43 gradually enter the corresponding clamping grooves 45, as shown in fig. 8, after the clamping blocks 43 enter the clamping grooves 45, the inclined surfaces of the clamping blocks are gradually contacted and abutted against the inclined surfaces of the clamping grooves 45, and as the oil liquid gradually pressurizes the clamping blocks 43, the extrusion force generated by the inclined surfaces of the clamping blocks 43 on the inclined surfaces of the clamping grooves 45 is also increased, so that the weak annular sealing area of the left buried pipe 1 (right buried pipe 2) is subjected to self-adaptive change tightening action along with the formation pressure, and meanwhile, as shown in fig. 3 and 4, the arc-shaped stop blocks 41 are distributed in an equal angle and spatial closed manner, namely, the integral surrounding is realized by the combination of a plurality of groups of arc-shaped stop blocks 41 in an annular section, the annular sealing area which is weaker for the left buried pipe 1 (the right buried pipe 2) can be subjected to the tightening effect which adaptively changes along with the formation pressure.
Meanwhile, when oil is injected into the second annular groove 51, the annular insert 52 continuously moves outwards under the action of oil pressure and is inserted and abutted against the inside of the annular groove 5, and meanwhile the extrusion force of the annular insert 52 to the annular groove 5 is gradually increased under the continuous action of oil pressure, so that the stability of connection between the annular sealing area of the left buried pipe 1 (right buried pipe 2) and the threaded connecting piece 3 is further improved.
Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.
Claims (3)
1. A threaded connector of a thin-wall geothermal buried pipe comprises a left buried pipe (1) and a right buried pipe (2), and is characterized in that the outsides of butt joint ends of the left buried pipe (1) and the right buried pipe (2) are connected with threaded connectors (3) in a threaded mode, first annular grooves (31) are formed in the insides of opposite ends of the two threaded connectors (3), annular butt joint parts (32) are arranged on the left buried pipe (1) and the right buried pipe (2), two groups of self-adaptive tightening assemblies are sequentially arranged in annular sealing areas where the left buried pipe (1) and the right buried pipe (2) are connected with the threaded connectors (3) in an inner-outer mode, self-adaptive tightening assemblies are arranged between inner ports of the left buried pipe (1) and the right buried pipe (2) and the threaded connectors (3), the self-adaptive tightening assemblies comprise arc grooves (4), arc-shaped stop blocks (41), cavity grooves (42), clamping blocks (43), arc grooves (44) and clamping grooves (45) are formed in the inner ends of the self-adaptive tightening assemblies, the arc grooves (4) are formed in the arc grooves (4), the arc grooves (41) are formed in a sliding mode, the inner ends of the arc-shaped buried pipe (3) are connected with the arc-shaped stop blocks (41), the inside of arc dog (41) has seted up chamber groove (42), and the inside symmetry slip of chamber groove (42) is provided with fixture block (43), and the inside symmetry of arc recess (44) has been seted up with two fixture block (43) grafting matching draw-in groove (45), arc groove (4) link up with first ring channel (31), arc groove (4) link up with two cavity groove (42) between fixture block (43) are connected, and the upper surface of draw-in groove (45) and fixture block (43) is the inclined plane design, the through-hole at the both ends has been seted up to the equiangular degree in center department of annular butt joint piece (32), and the both ends of annular butt joint piece (32) are slided respectively and are set up in the inside of two first ring channel (31), and the inside packing of first ring channel (31) has hydraulic oil, self-adaptation supports tight subassembly and includes annular groove (5), second ring channel (51) and annular insert piece (52), and left side buried pipe (1) and right side buried pipe (2) link up with threaded connection piece (3) and the inside of threaded connection piece (3) have both ends of annular groove (51), annular butt joint piece (3) are seted up with annular groove (51), the end part of the annular insert block (52) is matched and corresponds to the annular groove (5), and the second annular groove (51) is in through connection with the first annular groove (31).
2. The threaded connection of a thin-walled geothermal buried pipe according to claim 1, wherein the two sets of adaptive tightening assemblies are arranged in a spatially staggered manner, and the combination of the two sets of adaptive tightening assemblies achieves sealing of the transverse space of the annular sealing region.
3. A method of threaded connection of thin-walled geothermal pipes according to any of claims 1-2, comprising the steps of:
S1, respectively arranging a left buried pipe (1) and a right buried pipe (2) at the side of two threaded connectors (3), gradually sleeving the threaded connectors (3) on the outer wall of the left buried pipe (1) by rotating the threaded connectors (3), and gradually extruding and pushing an arc-shaped stop block (41) inwards along with the rotation of the end part of the left buried pipe (1), so that the arc-shaped stop block (41) pushes hydraulic oil in an arc-shaped groove (4) into a first annular groove (31);
S2, because the first annular groove (31) is filled with hydraulic oil, the hydraulic oil filled into the first annular groove (31) enters the second annular groove (51) in the form of oil pressure and pushes the annular insert block (52) which is not subjected to limiting temporarily, so that the annular insert block (52) gradually protrudes from the interior of the threaded connecting piece (3);
S3, the threaded connecting piece (3) is gradually and rotatably sleeved on the left buried pipe (1), when the left buried pipe (1) is completely positioned, the annular groove (5) is just sleeved at the outer end of the annular inserting block (52), meanwhile, the arc-shaped stop block (41) is just corresponding to the arc-shaped groove (44), the left buried pipe (1) is connected with the threaded connecting piece (3), then the threaded connecting piece (3) on the right side is rotated, the right buried pipe (2) is gradually pushed into the left buried pipe, and meanwhile, the connection of the right buried pipe (2) and the threaded connecting piece (3) is completed according to the principle.
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| CN202411433152.0A CN118959736B (en) | 2024-10-15 | 2024-10-15 | A threaded connection method and threaded connection piece for thin-walled geothermal buried pipe |
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| CN116928469A (en) * | 2023-09-14 | 2023-10-24 | 安徽省水利水电勘测设计研究总院有限公司 | Drainage pipe connecting piece is subtracted to modern agriculture irrigation wetland |
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| CN100588865C (en) * | 2007-01-24 | 2010-02-10 | 马可系统分析和发展有限公司 | Connector |
| CN109630774B (en) * | 2019-01-30 | 2020-07-03 | 重庆科创职业学院 | High-strength threaded joint |
| CN212004662U (en) * | 2020-04-02 | 2020-11-24 | 赵宝玉 | Safety protection device for petroleum pipeline |
| CN215520796U (en) * | 2021-06-08 | 2022-01-14 | 陕西西咸新区沣西新城能源发展有限公司 | High-performance liquid sealing threaded connection sleeve for middle-deep geothermal buried pipe |
| CN118273668B (en) * | 2024-06-04 | 2024-09-13 | 山东高原油气装备有限公司 | Connection structure containing torsion-resistant casing threads for casing drilling |
| CN118602201A (en) * | 2024-06-13 | 2024-09-06 | 江苏博格东进管道设备有限公司 | A safe explosion-proof self-sealing rotary compensator |
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| CN116928469A (en) * | 2023-09-14 | 2023-10-24 | 安徽省水利水电勘测设计研究总院有限公司 | Drainage pipe connecting piece is subtracted to modern agriculture irrigation wetland |
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