CN113846984A - Electric energy driven expansion tool assembly and method for realizing expansion pipe patching - Google Patents
Electric energy driven expansion tool assembly and method for realizing expansion pipe patching Download PDFInfo
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- CN113846984A CN113846984A CN202111110705.5A CN202111110705A CN113846984A CN 113846984 A CN113846984 A CN 113846984A CN 202111110705 A CN202111110705 A CN 202111110705A CN 113846984 A CN113846984 A CN 113846984A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 125
- 238000007789 sealing Methods 0.000 claims abstract description 92
- 230000008569 process Effects 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims description 58
- 229910052751 metal Inorganic materials 0.000 claims description 58
- 229920001971 elastomer Polymers 0.000 claims description 22
- 238000010276 construction Methods 0.000 claims description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical class C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 239000003129 oil well Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 238000004873 anchoring Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 239000007769 metal material Substances 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 241000978499 Brunnichia ovata Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 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
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/10—Reconditioning of well casings, e.g. straightening
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Abstract
The invention relates to the technical field of oil well maintenance tools, in particular to an electric energy driven expansion tool assembly and a method for realizing expansion pipe patching. The electric energy driven expansion tool assembly comprises an expansion pipe, an expansion pipe sealing mechanism, an expansion cone, a releasing mechanism and an electric pump-hydraulic cylinder driving mechanism, wherein the expansion pipe sealing mechanism is sleeved on the outer wall of each expansion pipe; the electric pump-hydraulic cylinder driving mechanism comprises an electric pump and a piston type multi-stage hydraulic cylinder connected with the electric pump, a piston rod of the piston type multi-stage hydraulic cylinder is connected with the releasing mechanism, and a cylinder barrel of the piston type multi-stage hydraulic cylinder is abutted to an expansion cone positioned at the upper end of the expansion pipe. The invention optimizes the traditional one-way full-well section expansion process into two-way local expansion and electric energy driving, thereby realizing the rapid expansion patching of the oil casing.
Description
Technical Field
The invention relates to the technical field of oil well maintenance tools, in particular to an electric energy driven expansion tool assembly and a method for realizing expansion pipe patching.
Background
When the conventional expansion pipe technology is used for conducting expansion pipe patching construction on an oil casing, the sizes of an expansion pipe, an expansion pipe expansion cavity and an expansion tool need to be determined according to the inner diameter size of the casing, then the expansion tool is assembled in the cavity of the expansion pipe expansion cavity, liquid is utilized to form a high-pressure sealing cavity at the lower part of the expansion cavity, expansion work on the expansion pipe is achieved by using the hydraulic driving expansion tool, and then patching on the conventional casing is achieved. Conventional expansion pipe technology, which requires fluid to drive, requires tubing and drill pipe as the channels for tool delivery and hydraulic energy. And the connection and transfer mode of the oil pipe and the casing pipe determines that the time consumption is long in the traditional expansion pipe construction, and the construction time of the single expansion pipe can be completed within 2-5 days according to the difference of the construction depth.
In some cases, the primary purpose of some oil casing repairs is to restore wellbore integrity, which is more sensitive to variations in construction time/cost. Therefore, in response to these time/cost sensitive construction requirements, it is urgently needed to develop an expansion pipe process capable of rapid construction.
Disclosure of Invention
The invention aims to provide an electric energy driven expansion tool assembly and a method for realizing expansion pipe patching, which overcome the defects of the prior art, wherein the expansion tool assembly has a quick expansion function and a releasing function, the traditional unidirectional full-well section expansion process is optimized into bidirectional local expansion, the expansion tool assembly is conveyed to the underground by a cable, and the electric energy is used for driving, so that the quick expansion patching of an oil casing pipe is realized.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an electrically powered expansion tool assembly comprising an expansion pipe, an expansion pipe sealing mechanism, an expansion tool, a release mechanism and an electric pump-hydraulic cylinder drive mechanism, wherein:
the both ends of inflation pipe outer wall all are provided with the location domatic, all overlap on the inflation pipe outer wall of the domatic inboard in location and be equipped with inflation pipe sealing mechanism, during downhole casing or oil pipe were located to the inflation pipe cover, inflation pipe sealing mechanism and downhole casing or oil pipe's inner wall formed the extrusion seal, the domatic effect of location is injectd for inflation pipe sealing mechanism formation position, inflation pipe and inflation pipe sealing mechanism are for taking place the part of direct relevance with downhole oil pipe, require to be to the performance index of inflation pipe: the uniform elongation of the expansion pipe material is more than 30%, and the tolerance of the geometric dimension (inner diameter/outer diameter and length) of the expansion section after the expansion pipe is processed is respectively less than 0.05 mm and 0.1 mm;
the expansion tool is an expansion cone, two ends of the inner cavity of the expansion pipe are inserted with one expansion cone, an expansion cone clamping table is arranged in the inner cavity of the expansion pipe, a distance exists between the expansion cone clamping table and the expansion cone, the distance is the distance that the expansion cone can move in the inner cavity of the expansion pipe and can support the expansion pipe, a releasing mechanism is arranged in the expansion cone at the lower end of the expansion pipe, the expansion cone is supported by the releasing mechanism and is tightly attached to the expansion pipe, the expansion cone at the lower end of the expansion pipe is separated from the expansion pipe under the condition that the expansion cone is separated from the releasing tool, and in order to realize that the small oil pipe is expanded and deformed by mechanical force in a limited underground space, the invention discloses a design of adopting an external expansion cone, so that a larger expansion cone can be used as much as possible, and the expansion rate is improved;
the electric pump-hydraulic cylinder driving mechanism comprises an electric pump and a piston type multi-stage hydraulic cylinder connected with the electric pump, a piston rod of the piston type multi-stage hydraulic cylinder is connected with the releasing mechanism, a cylinder barrel of the piston type multi-stage hydraulic cylinder is abutted to an expansion cone positioned at the upper end of the expansion pipe, under the driving of an expansion tool, under the driving of mechanical energy, two expansion cones are driven to move oppositely from two ends of the expansion pipe simultaneously to do expansion work, the accurate positioning of the expansion pipe and a restoration target can be realized, and the efficient expansion of the expansion pipe is realized; the electric pump-hydraulic cylinder driving mechanism has the working principle that after the whole expansion tool assembly is assembled and is driven to the designed depth in the well, the electric pump is started through a cable, the liquid in the well is pumped into the piston type multi-stage hydraulic cylinder, corresponding pulling force is generated by using multi-stage pistons in the piston type multi-stage hydraulic cylinder, the pulling force is transmitted to a releasing tool through a piston rod of the piston type multi-stage hydraulic cylinder, and an expansion cone is pulled to perform expansion work.
Furthermore, the releasing mechanism comprises a central rod, a locking nut, a locking cone, an elastic finger and a breaking ring, wherein the outer wall of the central rod is provided with threads, the breaking ring is sleeved on the outer wall of the central rod and is in threaded connection with the central rod, the outer wall of the breaking ring is provided with a clamping groove, one end of the elastic finger is provided with a clamping ring, the other end of the elastic finger is circumferentially provided with a plurality of openings, an elastic finger sleeve is arranged outside the central rod, the clamping ring of the elastic finger is clamped into the clamping groove of the breaking ring, the locking cone is sleeved on the outer wall of the central rod, one end of the locking cone extends into the end, provided with the opening, of the elastic finger to prop up the elastic finger, the locking nut is in threaded connection with the central rod, the locking cone is positioned between the locking nut and the elastic finger, the inner wall of an expansion cone at the lower end of the expansion pipe is propped up by the elastic finger, and a piston rod of the piston type multistage hydraulic cylinder is connected with the central rod; the main effect of the locking nut is to position the locking cone, the opening degree of the elastic finger is influenced by the position of the locking cone, the expansion degree of the elastic finger determines the expansion degree of the expansion cone, the expansion cone is abutted to the inner wall of the expansion pipe through the support of the elastic finger, the two ends of the elastic finger are supported by the breaking finger and the locking cone, the breaking finger is clamped with the elastic finger, the breaking finger is driven to move when the central rod is pulled, the elastic finger is pulled by the breaking finger, the expansion cone is clamped on the expansion cone clamping table and then is continuously pulled by the central rod, the tensile force of the central rod to the breaking ring exceeds the designed tensile capacity of the breaking ring, at the moment, the breaking ring is broken, and the movement of the central rod only drives the broken breaking rod, the locking nut and the locking cone to move.
Furthermore, the inner diameter of the expansion cone clamping platform is smaller than the outer diameter of one end of the elastic finger provided with the clamping ring, the inner diameter of the expansion cone clamping platform is larger than the maximum outer diameter of the locking cone body and is also larger than the outer diameter of the locking nut, the elastic finger is also limited by the expansion cone clamping platform after the expansion cone is clamped on the expansion cone clamping platform, the movement of the locking nut and the locking cone body is not limited, the locking nut and the locking cone body can be conveniently pulled out from the inside of the expansion cone, and at the moment, the elastic finger loses the support and retracts to separate from the expansion cone.
Furthermore, the lift angle of the expansion cone is 10-12 degrees, the length of the expansion cone is matched with the total length of the expansion pipe sealing mechanism, and the length of the expansion cone is matched with the position of the expansion cone clamping table, so that a stopping function can be provided for the releasing mechanism.
Furthermore, the expansion pipe sealing mechanism is a double sealing mechanism and comprises at least two rubber sealing mechanisms and at least two soft metal sealing mechanisms, the rubber sealing mechanisms and the soft metal sealing mechanisms are alternately arranged, the rubber sealing mechanisms play a main sealing role, sealing is formed between the expansion pipe and the outer casing pipe, meanwhile, in order to solve the problem that sealing failure is caused after carbonization of rubber possibly occurs under a high-temperature environment, the soft metal sealing mechanisms are used for supplementing the sealing mechanisms of the whole system, and each system is guaranteed to be composed of at least two rubber sealing mechanisms and two soft metal sealing mechanisms which are arranged in a crossed mode, so that multiple guarantee can be formed.
Furthermore, the main body of the soft metal sealing mechanism is a soft metal sleeve, the outer wall of the soft metal sleeve is provided with grooves, a circle of soft metal sealing teeth is arranged between every two adjacent grooves, the angle of one side, close to the tail part of the expansion cone, of each soft metal sealing tooth is 150-165 degrees, the angle of one side, close to the head part of the expansion cone, of each soft metal sealing tooth is 120-135 degrees, the structural combination angle design is favorable for ensuring the flowability of the soft metal material in the process that the tail part of the expansion cone gradually enters the interior of the expansion cone, a space for the soft metal material to flow is provided after the soft metal material is extruded to a certain degree, the accumulation of the soft metal material in the direction is avoided, the soft metal is ensured to generate a unidirectional flow effect under the action of the mechanical thrust of the expansion cone in the expansion process, the reserved grooves are filled in volume, and sealing and anchoring are formed, if reverse thrust is applied in the later releasing process, the soft metal can be accumulated, so that corresponding anchoring force is provided.
Furthermore, the soft metal sealing mechanism is made of red copper, the ductility of the red vine is good, sealing and anchoring are formed by utilizing the fluidity of the red copper, and the rubber sealing mechanism is made of hydrogenated butadiene-acrylonitrile rubber.
Furthermore, the compression rate of the rubber sealing mechanism after the expansion pipe is subjected to patching construction is 18-38%, so that an excellent sealing effect can be formed between the expansion pipe and the outer-layer sleeve.
Furthermore, the total volume of the soft metal sealing mechanism before the expansion pipe patching construction is 75-80% of the annular volume of the soft metal sealing mechanism after the expansion pipe patching construction, and in order to prevent the excessive soft metal from generating metal accumulation to cause the blockage of the expansion process, the invention designs metal compensation configuration, namely firstly determining the volume of the annular volume where the soft metal sealing section is located after the expansion according to the outer diameter of the pipe body after the expansion of the expansion pipe, then determining the inner diameter value of the outer layer and the width of the soft metal sealing mechanism, designing the total volume of the soft metal sealing mechanism to be 75-80% of the annular volume, and ensuring the flow space after the soft metal is extruded and deformed.
A method for realizing expansion pipe patching by using an electric energy driven expansion tool assembly comprises the following steps:
(1) a sending-down stage: assembling an electric energy driven expansion tool assembly with a proper length according to the specific condition of each well, and sending the electric energy driven expansion tool assembly into the well by a cable after the assembly is finished to reach the depth to be constructed;
(2) an expansion stage: starting an electric pump in the electric pump-hydraulic cylinder driving mechanism through a cable, pumping liquid in a well into a piston type multistage hydraulic cylinder, utilizing a piston rod of the piston type multistage hydraulic cylinder to generate tension, pulling a central rod, driving a locking nut, a locking cone body and a breaking ring to move by the central rod, further driving an elastic finger and an expansion cone at the lower end of an expansion pipe supported by the elastic finger to move, pulling the expansion cone into the inner part of the expansion pipe to expand and support the lower end of the expansion pipe, meanwhile, the expansion pipe is subjected to the tension towards the electric pump-hydraulic cylinder driving mechanism, so that the upper end of the expansion pipe completely sleeves the expansion cone between the upper end of the expansion pipe and the electric pump-hydraulic cylinder driving mechanism, the expansion cone expands and supports the upper end of the expansion pipe, and when the expansion cones at two sides are abutted against corresponding expansion cone clamping tables, an expansion stage is completed;
(3) a releasing phase: the power provided by the electric pump-hydraulic cylinder driving mechanism is utilized to continuously pull the central rod, the pulling force of the central rod on the breaking ring exceeds the designed tensile capacity of the breaking ring, at the moment, the breaking ring is broken, the central rod drives the locking cone and the locking nut to move towards the electric pump-hydraulic cylinder driving mechanism, and the locking cone is separated from the elastic finger, so that the supporting function of the elastic finger is removed, the opening end of the elastic finger retracts, the supporting function of the expansion cone at the lower end of the expansion pipe is removed, and the releasing process is realized.
The invention has the beneficial effects that: compared with the prior art, the electric energy driven expansion tool assembly and the method for realizing expansion pipe patching have the following advantages: an electric pump-hydraulic cylinder driving mechanism is creatively introduced into the system, electric energy is directly converted into mechanical energy required by expansion construction, a hydraulic driving tool is optimized into electric energy which is converted into mechanical energy, and then the mechanical energy is utilized to drive an expansion tool assembly, so that expansion work is completed; according to the characteristic of mechanical expansion, the traditional unidirectional full-well section expansion process is optimized to be bidirectional local expansion, and two sealing mechanisms with different mechanisms are introduced into an expansion pipe system, so that expansion pipe expansion patching construction of the oil casing pipe is completed, the expansion patching construction efficiency is high, the precision is high, and the integrity of a shaft is quickly recovered.
Drawings
FIG. 1 is a schematic internal view of the general structure of the present invention (the electric pump-hydraulic cylinder drive mechanism only shows the piston rod);
FIG. 2 is a schematic diagram of the internal structure of the releasing mechanism of the present invention;
FIG. 3 is a schematic structural diagram of a releasing mechanism and an expansion cone of the present invention;
FIG. 4 is a schematic structural diagram of the releasing mechanism of the present invention;
FIG. 5 is a schematic structural view of an expansion pipe sealing mechanism at the lower end of the expansion pipe of the present invention;
FIG. 6 is a schematic structural view of the soft metal seal mechanism of the present invention;
FIG. 7 is a schematic perspective view of the electric pump-hydraulic cylinder driving mechanism of the present invention;
FIG. 8 is a schematic view of the internal structure of the electric pump-hydraulic cylinder driving mechanism of the present invention;
the device comprises an expansion pipe 1, a positioning slope surface 101, an expansion cone clamping table 102, an expansion pipe 2 sealing mechanism, a rubber 201 sealing mechanism, a soft metal 202 sealing mechanism, a soft metal 203 casing pipe, a groove 204, a soft metal 205 sealing tooth, an expansion cone 3, a releasing mechanism 4, a 401 central rod, a 402 locking nut, a 403 locking cone body, an elastic finger 404, a 405 breaking ring, a 406 clamping groove, a 407 clamping ring, a 408 opening, a 5 electric pump-hydraulic cylinder driving mechanism, an 501 electric pump, a 502 piston type multistage hydraulic cylinder and a 503 piston rod.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
EXAMPLE 1 an electrically powered expansion tool Assembly
In the embodiment shown in fig. 1-8, an electrically powered expansion tool assembly comprises an expansion pipe 1, an expansion pipe sealing mechanism 2, an expansion tool, a release mechanism 4, and an electric pump-hydraulic cylinder drive mechanism 5, wherein:
the both ends of 1 outer wall of expansion pipe all are provided with the domatic 101 in location, all the cover is equipped with expansion pipe sealing mechanism 2 on the 1 outer wall of the expansion pipe of the domatic 101 inboard in location, 1 cover of expansion pipe is located in well casing or oil pipe, expansion pipe sealing mechanism 2 forms extrusion seal with the inner wall of well casing or oil pipe, the effect of the domatic 101 in location is injectd for 2 formation positions of expansion pipe sealing mechanism, expansion pipe 1 and expansion pipe sealing mechanism 2 are for taking place the part of direct relevance with well oil pipe, require to be to the performance index of expansion pipe 1: the uniform extensibility of the material of the expansion pipe 1 is more than 30%, and the tolerance of the geometric dimension (inner diameter/outer diameter and length) of the expansion section of the expansion pipe 1 after treatment is respectively less than 0.05 mm and 0.1 mm;
the expansion tool is an expansion cone 3, two ends of the inner cavity of an expansion pipe 1 are inserted with one expansion cone 3, the inner cavity of the expansion pipe 1 is provided with an expansion cone clamping table 102, a distance exists between the expansion cone clamping table 102 and the expansion cone 3, the distance is the distance that the expansion cone 3 can move in the inner cavity of the expansion pipe 1 and support the expansion pipe 1, a releasing mechanism 4 is arranged inside the expansion cone 3 at the lower end of the expansion pipe 1, the expansion cone 3 is supported by the releasing mechanism 4 and is tightly attached to the expansion pipe 1, and the expansion cone 3 at the lower end of the expansion pipe 1 is separated from the expansion pipe 1 under the condition that the expansion cone 3 is separated from the releasing tool, so that the small oil pipe is expanded and deformed by mechanical force in a limited underground space;
the electric pump-hydraulic cylinder driving mechanism 5 comprises an electric pump 501 and a piston type multi-stage hydraulic cylinder 502 connected with the electric pump 501, a piston rod 503 of the piston type multi-stage hydraulic cylinder 502 is connected with the releasing mechanism 4, a cylinder barrel of the piston type multi-stage hydraulic cylinder 502 is abutted to an expansion cone 3 positioned at the upper end of the expansion pipe 1, and under the driving of an expansion tool, under the driving of mechanical energy, two expansion cones 3 are simultaneously driven to move oppositely from two ends of the expansion pipe 1 to perform expansion work by utilizing the mutual relation of acting force and reacting force, so that the accurate positioning of the expansion pipe 1 and a repair target can be realized, and the efficient expansion of the expansion pipe 1 is realized; the electric pump-hydraulic cylinder driving mechanism 5 has the working principle that after the whole expansion tool assembly is assembled and is lowered to the designed depth in the well, the electric pump 501 is started through a cable, the liquid in the well is pumped into the piston type multistage hydraulic cylinder 502, corresponding pulling force is generated by using multistage pistons in the piston type multistage hydraulic cylinder 502, the pulling force is transmitted to a releasing tool through a piston rod 503 of the piston type multistage hydraulic cylinder 502, and the expansion cone 3 is pulled to perform expansion work.
In this embodiment, the releasing mechanism 4 includes a central rod 401, a locking nut 402, a locking cone 403, an elastic finger 404 and a snap ring 405, the outer wall of the central rod 401 is provided with threads, the snap ring 405 is sleeved on the outer wall of the central rod 401 and is in threaded connection with the central rod 401, the outer wall of the snap ring 405 is provided with a clamping groove 406, one end of the elastic finger 404 is provided with a clamping ring 407, the other end of the elastic finger 404 is circumferentially provided with a plurality of openings 408, the elastic finger 404 is sleeved outside the central rod 401 and the clamping ring 407 of the elastic finger 404 is clamped in the clamping groove 406 of the snap ring 405, the locking cone 403 is sleeved on the outer wall of the central rod 401, one end of the locking cone 403 extends into the end of the elastic finger 404 provided with the opening 408 to prop up the elastic finger 404, the locking nut 402 is in threaded connection with the central rod 401, the locking cone 403 is located between the locking nut 402 and the elastic finger 404, the inner wall of the expansion cone 3 at the lower end of the expansion pipe 1 is propped up by the elastic finger 404, a piston rod 503 of the piston type multi-stage hydraulic cylinder 502 is connected with the central rod 401; the locking nut 402 is mainly used for positioning the locking cone body 403, the opening degree of the elastic fingers 404 is influenced by the position of the locking cone body 403, the opening degree of the elastic fingers 404 determines the expansion degree of the expansion cone 3, the expansion cone 3 abuts against the inner wall of the expansion pipe 1 through the support of the elastic fingers 404, the two ends of the elastic fingers 404 are supported by the breaking fingers and the locking cone body 403, meanwhile, the breaking fingers are clamped with the elastic fingers 404, the breaking fingers are driven to move when the central rod 401 is pulled, the elastic fingers 404 are pulled by the breaking fingers, the expansion cone 3 is clamped on the expansion cone clamping table 102, the central rod 401 is continuously pulled, the pulling force of the breaking ring 405 by the central rod 401 exceeds the designed tensile capacity of the breaking ring 405, at the moment, the breaking ring 405 is broken, and the movement of the central rod 401 only drives the broken breaking rod, the locking nut 402 and the locking cone body 403 to move.
In this embodiment, the inner diameter of the expansion cone clamping platform 102 is smaller than the outer diameter of the end of the elastic finger 404 provided with the clamping ring 407, the inner diameter of the expansion cone clamping platform 102 is larger than the maximum outer diameter of the locking cone 403 and also larger than the outer diameter of the locking nut 402, after the expansion cone 3 is clamped on the expansion cone clamping platform 102, the elastic finger 404 is also limited by the expansion cone clamping platform 102, the movement of the locking nut 402 and the locking cone 403 is not limited, which is beneficial to pulling the locking nut 402 and the locking cone 403 out of the expansion cone 3, and at this time, the elastic finger 404 loses support and retracts to separate from the expansion cone 3.
In this embodiment, the lift angle of the expansion cone 3 is 10 to 12 °, the length of the expansion cone 3 is matched with the total length of the expansion pipe sealing mechanism 2, and the length of the expansion cone 3 is matched with the position of the expansion cone clamping table 102, so that a stopping function can be provided for the releasing mechanism 4.
In this embodiment, the expansion pipe sealing mechanism 2 is a double sealing mechanism, and includes at least two rubber sealing mechanisms 201 and at least two soft metal sealing mechanisms 202, the rubber sealing mechanisms 201 and the soft metal sealing mechanisms 202 are alternately arranged, the rubber sealing mechanisms 201 have a main sealing function, and a seal is formed between the expansion pipe 1 and the outer casing pipe, meanwhile, in order to solve the problem that the seal fails after the rubber may be carbonized in a high-temperature environment, the soft metal seal is used for supplementing the sealing mechanisms of the whole system, so that each system is ensured to be composed of at least two rubber sealing mechanisms 201 and two soft metal sealing mechanisms 202 which are arranged in a crossed manner, and thus multiple guarantees can be formed.
In this embodiment, the main body of the soft metal sealing mechanism 202 is a soft metal sleeve 203, the outer wall of the soft metal sleeve 203 is provided with grooves 204, a circle of soft metal sealing teeth 205 is arranged between two adjacent grooves 204, the angle of one side of the soft metal sealing teeth 205 close to the tail of the expansion cone 3 is 150-, thereby forming a seal and an anchor, and if the soft metal is subjected to reverse thrust in the later releasing process, the soft metal can be accumulated, thereby providing corresponding anchoring force.
In this embodiment, the soft metal sealing mechanism 202 is made of red copper, the red copper has good ductility, sealing and anchoring are formed by utilizing the fluidity of the red copper, and the rubber sealing mechanism 201 is made of hydrogenated butadiene-acrylonitrile rubber.
In this embodiment, the compression rate of the rubber sealing mechanism 201 after the expansion pipe 1 is repaired is 18-38%, so that an excellent sealing effect can be formed between the expansion pipe 1 and the outer casing.
In this embodiment, the total volume of the soft metal sealing mechanism 202 before the expansion pipe 1 patching construction is 75-80% of the annular volume of the soft metal sealing mechanism 202 after the expansion pipe 1 patching construction, and in order to prevent the excessive soft metal from generating soft metal accumulation to cause the obstruction of the expansion process, the invention designs metal compensation configuration, namely, firstly, the volume of the annular space where the soft metal sealing section is located after the expansion is determined according to the outer diameter of the pipe body after the expansion of the expansion pipe 1, then according to the inner diameter value of the outer layer and the width of the soft metal sealing mechanism, the total volume of the soft metal sealing mechanism is designed to be 75-80% of the annular volume, and the flowing space after the metal is extruded and deformed is ensured.
A method for realizing patching of an expansion pipe 1 by an electric energy driven expansion tool assembly comprises the following steps:
(1) a sending-down stage: assembling an electric energy driven expansion tool assembly with a proper length according to the specific condition of each well, and sending the electric energy driven expansion tool assembly into the well by a cable after the assembly is finished to reach the depth to be constructed;
(2) an expansion stage: an electric pump in the electric pump-hydraulic cylinder driving mechanism 5 is started through a cable, liquid in the well is pumped into the piston type multi-stage hydraulic cylinder 502, a piston rod 503 of the piston type multi-stage hydraulic cylinder 502 generates pulling force, a central rod 401 is pulled, the central rod 401 drives a locking nut 402, a locking cone body 403 and a breaking ring 405 to move, an elastic finger 404 and an expansion cone 3 at the lower end of the expansion pipe 1 supported by the elastic finger 404 are further driven to move, the expansion cone 3 is pulled into the expansion pipe 1 to expand and support the lower end of the expansion pipe 1, meanwhile, the expansion pipe 1 bears the pulling force to the electric pump-hydraulic cylinder driving mechanism 5, so that the expansion cone 3 positioned between the upper end of the expansion pipe 1 and the electric pump-hydraulic cylinder driving mechanism 5 is completely sleeved at the upper end of the expansion pipe 1, the expansion cone 3 expands and supports the upper end of the expansion pipe 1, when the expansion cones 3 at two sides are all abutted to the corresponding expansion cone clamping tables 102, the expansion phase is completed;
(3) a releasing phase: the central rod 401 is continuously pulled by the power provided by the electric pump-hydraulic cylinder driving mechanism 5, the pulling force of the central rod 401 to the breaking ring 405 exceeds the designed tensile capacity of the breaking ring 405, at the moment, the breaking ring 405 is broken, the central rod 401 drives the locking cone and the locking nut 402 to move towards the electric pump-hydraulic cylinder driving mechanism 5, the locking cone 403 is separated from the elastic finger 404, so that the supporting function of the elastic finger 404 is released, the opening 408 end of the elastic finger 404 retracts, the supporting function of the expansion cone 3 at the lower end of the expansion pipe 1 is released, and the releasing process is realized.
The above embodiments are only specific examples of the present invention, and the protection scope of the present invention includes but is not limited to the product forms and styles of the above embodiments, and any suitable changes or modifications made by those skilled in the art according to the claims of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. An electrically powered expansion tool assembly, comprising: the device comprises an expansion pipe, an expansion pipe sealing mechanism, an expansion tool, a releasing mechanism and an electric pump-hydraulic cylinder driving mechanism, wherein:
the two ends of the outer wall of the expansion pipe are respectively provided with a positioning slope surface, the outer wall of the expansion pipe at the inner side of the positioning slope surface is respectively sleeved with an expansion pipe sealing mechanism, the expansion pipe is sleeved in the underground casing pipe or the oil pipe, and the expansion pipe sealing mechanism and the inner wall of the underground casing pipe or the oil pipe form extrusion sealing;
the expansion tool is an expansion cone, two ends of the inner cavity of the expansion pipe are both inserted into one expansion cone, an expansion cone clamping table is arranged in the inner cavity of the expansion pipe, a space exists between the expansion cone clamping table and the expansion cone, a releasing mechanism is arranged in the expansion cone at the lower end of the expansion pipe, and the expansion cone is supported by the releasing mechanism and is tightly attached to the expansion pipe;
the electric pump-hydraulic cylinder driving mechanism comprises an electric pump and a piston type multi-stage hydraulic cylinder connected with the electric pump, a piston rod of the piston type multi-stage hydraulic cylinder is connected with the releasing mechanism, and a cylinder barrel of the piston type multi-stage hydraulic cylinder is abutted to an expansion cone positioned at the upper end of the expansion pipe.
2. An electrically powered expansion tool assembly according to claim 1, wherein: the releasing mechanism comprises a central rod, a locking nut, a locking cone, an elastic finger and a breaking ring, wherein the outer wall of the central rod is provided with threads, the breaking ring is sleeved on the outer wall of the central rod and is in threaded connection with the central rod, a clamping groove is formed in the outer wall of the breaking ring, one end of the elastic finger is provided with a clamping ring, a plurality of openings are formed in the other end of the elastic finger along the circumferential direction, an elastic finger sleeve is arranged outside the central rod, the clamping ring of the elastic finger is clamped into the clamping groove of the breaking ring, the locking cone is sleeved on the outer wall of the central rod, one end of the locking cone extends into the end, provided with the opening, of the elastic finger to support the elastic finger, the locking nut is in threaded connection with the central rod, the locking cone is located between the locking nut and the elastic finger, the inner wall of an expansion cone at the lower end of the expansion pipe is supported by the elastic finger, and a piston rod of the piston type multi-stage hydraulic cylinder is connected with the central rod.
3. An electrically powered expansion tool assembly according to claim 2, wherein: the inner diameter of the expansion cone clamping table is smaller than the outer diameter of one end of the elastic finger provided with the clamping ring, and the inner diameter of the expansion cone clamping table is larger than the maximum outer diameter of the locking cone body and is also larger than the outer diameter of the locking nut.
4. An electrically powered expansion tool assembly according to claim 1, wherein: the lift angle of the expansion cone is 10-12 degrees.
5. An electrically powered expansion tool assembly according to claim 1 or 2, wherein: the expansion pipe sealing mechanism comprises at least two rubber sealing mechanisms and at least two soft metal sealing mechanisms, and the rubber sealing mechanisms and the soft metal sealing mechanisms are alternately arranged.
6. An electrically powered expansion tool assembly according to claim 5, wherein: the main body of the soft metal sealing mechanism is a soft metal sleeve, the outer wall of the soft metal sleeve is provided with grooves, a circle of soft metal sealing teeth is arranged between every two adjacent grooves, the angle of one side, close to the tail portion of the expansion cone, of each soft metal sealing tooth is 150-135 degrees, and the angle of one side, close to the head portion of the expansion cone, of each soft metal sealing tooth is 120-135 degrees.
7. An electrically powered expansion tool assembly according to claim 5, wherein: the soft metal sealing mechanism is made of red copper, and the rubber sealing mechanism is made of hydrogenated butadiene-acrylonitrile rubber.
8. An electrically powered expansion tool assembly according to claim 5, wherein: the compression rate of the rubber sealing mechanism after the expansion pipe is repaired is 18-38%.
9. An electrically powered expansion tool assembly according to claim 5, wherein: the total volume of the soft metal sealing mechanism before the expansion pipe patching construction is 75-80% of the annular volume of the soft metal sealing mechanism after the expansion pipe patching construction.
10. A method for realizing expansion pipe patching by an electric energy-driven expansion tool assembly is characterized by comprising the following steps: the method comprises the following steps:
(1) a sending-down stage: assembling an electric energy driven expansion tool assembly with a proper length according to the specific condition of each well, and sending the electric energy driven expansion tool assembly into the well by a cable after the assembly is finished to reach the depth to be constructed;
(2) an expansion stage: starting an electric pump in the electric pump-hydraulic cylinder driving mechanism through a cable, pumping liquid in a well into a piston type multistage hydraulic cylinder, utilizing a piston rod of the piston type multistage hydraulic cylinder to generate tension, pulling a central rod, driving a locking nut, a locking cone body and a breaking ring to move by the central rod, further driving an elastic finger and an expansion cone at the lower end of an expansion pipe supported by the elastic finger to move, pulling the expansion cone into the inner part of the expansion pipe to expand and support the lower end of the expansion pipe, meanwhile, the expansion pipe is subjected to the tension towards the electric pump-hydraulic cylinder driving mechanism, so that the upper end of the expansion pipe completely sleeves the expansion cone between the upper end of the expansion pipe and the electric pump-hydraulic cylinder driving mechanism, the expansion cone expands and supports the upper end of the expansion pipe, and when the expansion cones at two sides are abutted against corresponding expansion cone clamping tables, an expansion stage is completed;
(3) a releasing phase: the power provided by the electric pump-hydraulic cylinder driving mechanism is utilized to continuously pull the central rod, the pulling force of the central rod on the breaking ring exceeds the designed tensile capacity of the breaking ring, at the moment, the breaking ring is broken, the central rod drives the locking cone and the locking nut to move towards the electric pump-hydraulic cylinder driving mechanism, and the locking cone is separated from the elastic finger, so that the supporting function of the elastic finger is removed, the opening end of the elastic finger retracts, the supporting function of the expansion cone at the lower end of the expansion pipe is removed, and the releasing process is realized.
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