CN110748317A - Coiled tubing sealed circulating stuck freeing device and coiled tubing sealed circulating stuck freeing method - Google Patents
Coiled tubing sealed circulating stuck freeing device and coiled tubing sealed circulating stuck freeing method Download PDFInfo
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- CN110748317A CN110748317A CN201910969419.0A CN201910969419A CN110748317A CN 110748317 A CN110748317 A CN 110748317A CN 201910969419 A CN201910969419 A CN 201910969419A CN 110748317 A CN110748317 A CN 110748317A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000007789 sealing Methods 0.000 claims abstract description 66
- 241000251468 Actinopterygii Species 0.000 claims abstract description 42
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000010008 shearing Methods 0.000 claims description 70
- 238000001125 extrusion Methods 0.000 claims description 23
- 238000005406 washing Methods 0.000 claims description 16
- 230000001965 increasing effect Effects 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 8
- 230000005489 elastic deformation Effects 0.000 claims description 7
- 125000004122 cyclic group Chemical group 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 4
- 238000012856 packing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000003825 pressing 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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
- E21B31/18—Grappling tools, e.g. tongs or grabs gripping externally, e.g. overshot
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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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
- E21B31/16—Grappling tools, e.g. tongs or grabs combined with cutting or destroying means
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
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- Marine Sciences & Fisheries (AREA)
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Abstract
The invention relates to the technical field of oil pipe salvage, in particular to a continuous oil pipe sealing circulating unfreezing device and a continuous oil pipe sealing circulating unfreezing method, wherein the continuous oil pipe sealing circulating unfreezing device comprises an upper joint, a conversion joint, an outer cylinder body, a salvage slip, a slip seat, a sealing rubber cylinder, a cutting press ring, a shear pin, a shear slip, a spiral inner cylinder, a spring, a pin, a spiral outer cylinder and a guide shoe, wherein the outer side of the lower end of the upper joint is fixedly installed with the inner side of the upper end of the; the latter comprises the following steps: (1) and fixedly mounting the upper joint and the lower end of the fishing pipe column together. The invention has reasonable and compact structure and ingenious conception, and the pin is matched with the rotary groove to ensure that the spiral outer cylinder rotates relative to the spiral inner cylinder, so that the guide shoe can guide the top of the fallen fish into the fishing tool in a rotating way; the sealing rubber barrel is extruded through the slip seat and the cutting press ring, so that the sealing rubber barrel is elastically deformed, the sealing between the inner wall of the outer barrel and the outer wall of the salvaged continuous oil pipe is realized, and the sealing rubber barrel has the characteristics of high efficiency, stability, time saving and labor saving.
Description
Technical Field
The invention relates to the technical field of oil pipe fishing, in particular to a coiled tubing sealed circulating stuck freeing device and a coiled tubing sealed circulating stuck freeing method.
Background
Along with the popularization and the application of the coiled tubing in the field of oil and gas downhole operation, the coiled tubing is applied more on an oil and gas field, and simultaneously, the complex conditions that the coiled tubing is blocked and stuck in a well and the like occur after more coiled tubing is broken. Because tools and operation experiences for processing complex conditions such as coiled tubing unfreezing and fishing are few in the current operation field, the tools and the method are limited in the processing of the complex conditions, the processing is passive, and the success rate is low. In addition, the existing rubber cylinder is poor in sealing effect after being deformed by stress.
Disclosure of Invention
The invention provides a coiled tubing sealed circulating stuck releasing device and a coiled tubing sealed circulating stuck releasing method, overcomes the defects of the prior art, and can effectively solve the problem that the blockage of the prior coiled tubing cannot be released after the coiled tubing is stuck into a well.
One of the technical schemes of the invention is realized by the following measures: a continuous oil pipe sealing circulation stuck releaser comprises an upper joint, a conversion joint, an outer barrel, a fishing slip, a slip seat, a sealing rubber barrel, a cutting pressing ring, a shear pin, a shearing slip, a spiral inner barrel, a spring, a pin, a spiral outer barrel and a guide shoe, wherein the outer side of the lower end of the upper joint is fixedly arranged with the inner side of the upper end of the conversion joint; the middle part of the outer cylinder body is provided with a fishing and cutting channel which is communicated up and down, the fishing and cutting channel comprises a first straight hole, a first taper hole and a second straight hole which are communicated in sequence from top to bottom, and the first taper hole is a taper hole with a large top and a small bottom; a cutting press ring is fixedly arranged in a first straight hole corresponding to the inner side position of the middle part of the outer barrel body through a shear pin, a salvaging slip, a slip seat and a sealing rubber barrel are sequentially arranged above the cutting press ring from top to bottom, the lower end seat of the sealing rubber barrel is arranged at the upper end of the cutting press ring, the lower end seat of the slip seat is arranged at the upper end of the sealing rubber barrel, a second taper hole which is communicated from top to bottom is arranged in the middle of the slip seat, the second taper hole is a taper hole with a big top and a small bottom, the lower end seat of the salvaging slip is arranged at the inner side of the upper part of the second taper hole, the inner side of the upper part of the salvaging slip can radially expand outwards when being subjected to outward extrusion force, the outer side of the lower part of the salvaging slip can radially contract inwards when being subjected to inward extrusion force, annular slip teeth are arranged at the inner side of the salv, the inner side of the lower part of the shearing slip is provided with a shearing tooth, the shearing slip is positioned below the cutting press ring, and the outer diameter of the upper end of the shearing slip is larger than the inner diameter of the lower end of the cutting press ring; a limiting ring table is arranged on the outer side of the upper end of the spiral inner barrel, a spring is sleeved on the outer side of the spiral inner barrel corresponding to the position between the limiting ring table and the spiral outer barrel, the upper end of the spring is abutted against the lower end of the limiting ring table, and the lower end of the spring is abutted against the upper end of the spiral outer barrel; at least one pin is fixedly installed on the outer side of the upper part of the spiral outer barrel, the axis of the pin is vertical to the axis of the spiral outer barrel, a rotary groove capable of enabling the rotary pin to move up and down in the rotary groove is formed in the outer side of the spiral inner barrel corresponding to the position below the limiting ring table, the rotary groove is spiral, and the inner ends of the pins are located in the rotary groove; two outer ring grooves are distributed at intervals from top to bottom on the outer side of the sealing rubber cylinder, and an inner ring groove is arranged on the inner side of the middle part of the sealing rubber cylinder corresponding to the position between the two outer ring grooves.
The following is a further optimization or/and improvement of one of the above-mentioned technical solutions of the invention:
the salvaging slips can comprise a conical cylinder and a straight cylinder, the conical cylinder is in a hollow round platform shape with a small upper part and a large lower part, the straight cylinder is in a hollow cylindrical shape, the lower end of the conical cylinder and the upper end of the straight cylinder are fixedly installed together, the upper end of the salvaging slips is evenly provided with at least three upper long openings with lower ends positioned on the upper part of the straight cylinder along the circumference, and the lower end of the salvaging slips corresponding to the position between every two adjacent upper long openings is provided with a lower long opening with upper ends positioned on the lower part of the conical cylinder.
The shearing slips can be hollow cylindrical, and the lower end of the shearing slips is evenly provided with at least three strip openings with the upper ends positioned in the middle of the shearing slips along the circumference.
Two pins can be fixedly arranged on the outer side of the upper part of the spiral outer barrel.
The outer side of the lower end of the upper joint can be fixedly installed together with the inner side of the upper end of the adapter through threaded connection, the outer side of the lower end of the adapter can be fixedly installed together with the inner side of the upper end of the outer cylinder through threaded connection, the outer side of the lower end of the outer cylinder can be fixedly installed together with the inner side of the upper end of the spiral inner cylinder through threaded connection, and the outer side of the lower end of the spiral outer cylinder can be fixedly installed together with the inner side of the upper.
The second technical scheme of the invention is realized by the following measures: a coiled tubing sealed circulating stuck freeing method using the coiled tubing sealed circulating stuck freeing device comprises the following steps:
(1) fixedly installing the upper joint and the lower end of the fishing pipe column together, and lowering the fishing pipe column to start fishing operation;
(2) after the guide shoe contacts the fish top, the pin moves upwards in the rotary groove to enable the spiral outer cylinder to rotate relative to the spiral inner cylinder, so that the guide shoe rotates along with the spiral outer cylinder, and the fish top is guided into the guide shoe;
(3) after the fish top is introduced into the guide shoe, the fishing pipe column is lowered, and the fish top sequentially passes through the spiral outer cylinder, the spiral inner cylinder, the outer cylinder, the shearing slip, the cutting press ring, the sealing rubber cylinder, the slip seat and the fishing slip;
(4) the fishing pipe column is continuously lowered, the fish top continuously moves upwards, and when the fish top contacts the inner side of the upper end of the fishing slip and generates outward extrusion force on the fishing slip, the upper end of the fishing slip is radially expanded outwards;
(5) the elastic force of the upper end of the fishing slip grips the fish to provide initial pretightening force, under the pretightening force, the fishing pipe column is lifted, and the upper end of the fishing slip grips the outer wall of the fish to move downwards relative to the outer barrel;
(6) in the process that the salvaging slips move downwards, the lower ends of the salvaging slips are squeezed by the conical surfaces of the second taper holes and then are contracted inwards, the outer walls of the fallen fishes are tightly bitten by the annular slip teeth at the lower parts of the salvaging slips, and the salvaging pipe column is continuously lifted to finish the salvaging operation of the continuous oil pipe;
(7) if the coiled tubing is clamped underground and the fishing string cannot be lifted, appropriate lifting load can be increased, and the fishing string is continuously lifted for cyclic unfreezing;
(8) the salvaging slips and the slip seat move downwards relative to the outer cylinder along with the increase of the lifting load, and the slip seat moving downwards relative to the outer cylinder and the cutting press ring which keeps immovable relative to the outer cylinder extrude the sealing rubber cylinder to enable the sealing rubber cylinder to generate elastic deformation because the lifting load does not reach the shearing force sheared by the shear pin;
(9) the outer side of the sealing rubber cylinder subjected to extrusion deformation is tightly attached to the inner wall of the outer cylinder body, the inner side of the sealing rubber cylinder subjected to extrusion deformation is tightly attached to the outer wall of the salvaged continuous oil pipe, and at the moment, the elastic deformation of the sealing rubber cylinder is maintained by keeping a lifting load, namely, the sealing between the inner wall of the outer cylinder body and the outer wall of the salvaged continuous oil pipe is kept;
(10) pumping fluid into the salvaging pipe column from the ground, wherein the fluid can circulate into the salvaged continuous oil pipe, so as to realize the large-displacement circular washing or hot washing of the salvaged oil pipe, a bottom machine tool and a stuck point;
(11) through the large-displacement circular washing or hot washing, the blockage and blockage removal of the salvaged coiled tubing can be effectively implemented, the blockage and blockage removal success rate is improved, and after the blockage removal is successful, the salvage pipe column is continuously lifted to complete the salvage operation of the coiled tubing;
(12) if the coiled tubing is clamped underground and the fishing pipe column cannot be lifted after cyclic unfreezing, continuing to lower the fishing pipe column until the target position needing to be cut is reached, namely the stuck point position;
(13) after reaching the clamping point, lifting the fishing pipe column, enabling the annular slip teeth at the lower part of the fishing slip to bite the outer wall of the fish again, continuing to lift the fishing pipe column at the moment, and further increasing the lifting load;
(14) when the downward stress of the cutting press ring reaches the shearing force of the shearing of the shear pin, the shear pin is sheared, the cutting press ring continues to push the shearing slip downwards at the moment, the lower end of the shearing slip is extruded by the conical surface of the first conical hole and then contracts inwards, and the shearing teeth act on the outer wall of the coiled tubing to be salvaged;
(15) and continuously lifting the fishing pipe column to increase the lifting load until the coiled tubing to be fished is sheared, thereby completing the fishing operation of the coiled tubing to be fished.
The invention has reasonable and compact structure and ingenious conception, and the pin is matched with the rotary groove to ensure that the spiral outer cylinder rotates relative to the spiral inner cylinder, so that the guide shoe can guide the top of the fallen fish into the fishing tool in a rotating way; the sealing rubber cylinder is extruded through the slip seat and the cutting press ring, so that the sealing rubber cylinder is elastically deformed, and the sealing between the inner wall of the outer cylinder body and the outer wall of the salvaged continuous oil pipe is realized; salvage coiled tubing through salvaging the slips, cut by the coiled tubing through shearing the slips, have high efficiency, stable and labour saving and time saving's characteristics.
Drawings
FIG. 1 is a schematic sectional view of the preferred embodiment of the present invention.
FIG. 2 is a schematic view of the spiral inner barrel of FIG. 1.
The codes in the figures are respectively: 1 is the top connection, 2 is crossover sub, 3 is outer barrel, 4 is the slips of salvaging, 5 is the slip seat, 6 is the shear pin, 7 is the slips of shearing, 8 is the spiral inner tube, 9 is the spring, 10 is the pin, 11 is the spiral outer tube, 12 is the guide shoe, 13 is the spacing ring platform, 14 is the rotary groove, 15 is first taper hole, 16 is the second taper hole, 17 is the packing element, 18 is the cutting clamping ring, 19 is outer annular groove, 20 is inner annular groove.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
In the present invention, for convenience of description, the description of the relative positional relationship of the components is described according to the layout pattern of fig. 1 of the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of fig. 1 of the specification.
The invention is further described with reference to the following examples and figures:
as shown in the attached figures 1 and 2, the coiled tubing sealing circulation unfreezing device comprises an upper joint 1, an adapter 2, an outer cylinder 3, a fishing slip 4, a slip seat 5, a sealing rubber cylinder 17, a cutting press ring 18, a shear pin 6, a shearing slip 7, a spiral inner cylinder 8, a spring 9, a pin 10, a spiral outer cylinder 11 and a guide shoe 12, wherein the outer side of the lower end of the upper joint 1 is fixedly arranged with the inner side of the upper end of the adapter 2, the outer side of the lower end of the adapter 2 is fixedly arranged with the inner side of the upper end of the outer cylinder 3, the outer side of the lower end of the outer cylinder 3 is fixedly arranged with the inner side of the upper end of the spiral inner cylinder 8, the outer side of the lower part of the spiral inner cylinder 8 is sleeved with the; the middle part of the outer cylinder body 3 is provided with a fishing and cutting channel which is communicated up and down, the fishing and cutting channel comprises a first straight hole, a first taper hole 15 and a second straight hole which are communicated in sequence from top to bottom, and the first taper hole 15 is a taper hole with a large top and a small bottom; a cutting press ring 18 is fixedly arranged in a first straight hole corresponding to the inner side position of the middle part of the outer barrel 3 through a shear pin 6, a salvaging slip 4, a slip seat 5 and a sealing rubber barrel 17 are sequentially arranged above the cutting press ring 18 from top to bottom, the lower end of the sealing rubber barrel 17 is seated at the upper end of the cutting press ring 18, the lower end of the slip seat 5 is seated at the upper end of the sealing rubber barrel 17, a second taper hole 16 which is communicated up and down is arranged in the middle part of the slip seat 5, the second taper hole 16 is a taper hole with a big top and a small bottom, the lower end of the salvaging slip 4 is seated at the inner side of the upper part of the second taper hole 16, the inner side of the upper part of the salvaging slip 4 can be expanded radially outwards when being subjected to outwards extrusion force, the outer side of the lower part of the salvaging slip 4 can be contracted radially inwards when being subjected to inwards extrusion force, the inner side of the salvaging slip, the outer side of the lower part of the shearing slip 7 can contract inwards in the radial direction when being subjected to inward extrusion force, the inner side of the lower part of the shearing slip 7 is provided with shearing teeth, the shearing slip 7 is positioned below the cutting press ring 18, and the outer diameter of the upper end of the shearing slip 7 is larger than the inner diameter of the lower end of the cutting press ring 18; a limit ring platform 13 is arranged on the outer side of the upper end of the spiral inner cylinder 8, a spring 9 is sleeved on the outer side of the spiral inner cylinder 8 corresponding to the position between the limit ring platform 13 and the spiral outer cylinder 11, the upper end of the spring 9 is abutted against the lower end of the limit ring platform 13, and the lower end of the spring 9 is abutted against the upper end of the spiral outer cylinder 11; at least one pin 10 is fixedly installed on the outer side of the upper part of the spiral outer cylinder 11, the axis of the pin 10 is vertical to the axis of the spiral outer cylinder 11, a rotary groove 14 which can enable the rotary pin to move up and down in the rotary groove is arranged on the outer side of the spiral inner cylinder 8 corresponding to the position below the limiting ring table 13, the rotary groove 14 is spiral, and the inner ends of the pins 10 are all located in the rotary groove 14; two outer ring grooves 19 are distributed on the outer side of the sealing rubber tube 17 at intervals up and down, and an inner ring groove 20 is arranged on the inner side of the middle part of the sealing rubber tube 17 corresponding to the position between the two outer ring grooves 19.
According to requirements, the fishing slip 4 is a known technology, the upper part and the lower part of the fishing slip 4 are of split elastic structures, the inner side of the lower part of the fishing slip 4 is provided with an annular slip insert, the inner side of the upper part of the fishing slip 4 can be radially outwards expanded when being subjected to outwards extrusion force, and the outer side of the lower part of the fishing slip 4 can be radially inwards contracted when being subjected to inwards extrusion force; the shearing slip 7 is a known technology, the lower part of the shearing slip 7 is of a split elastic structure, shearing teeth are arranged on the inner side of the lower part of the shearing slip 7, and the outer side of the lower part of the shearing slip 7 can contract inwards in the radial direction when being subjected to inward extrusion force; the packing rubber tube 17 is a known technique, and is deformable when pressed, and the outer ring groove 19 and the inner ring groove 20 are provided to facilitate the deformation of the packing rubber tube 17 when pressed, and the outer ring groove 19 and the inner ring groove 20 may have a V-shaped cross section and a U-shaped cross section, respectively, thereby enhancing the sealing performance of the packing rubber tube 17. In the using process, the fishing tool is connected to the lower end of the existing well-known fishing pipe column, is fixedly installed with the lower end of the fishing pipe column through the upper connector 1, and then is lowered to start fishing operation; firstly, after the guide shoe 12 contacts the fish top, the spring 9 is compressed, the pin 10 moves upwards in the rotating groove 14, the spiral outer cylinder 11 rotates relative to the spiral inner cylinder 8, and the guide shoe 12 rotates along with the spiral outer cylinder 11, and the fish top is guided into the guide shoe 12; then, after the guide shoe 12 is introduced into the fish top, the fishing pipe column is lowered down, the fish top sequentially passes through the spiral outer cylinder 11, the spiral inner cylinder 8, the outer cylinder 3, the shearing slip 7, the cutting press ring 18, the sealing rubber cylinder 17, the slip seat 5 and the fishing slip 4, the fishing pipe column is continuously lowered at the moment, the fish top continuously goes upward, when the fish top contacts the inner side of the upper end of the fishing slip 4 to generate outward extrusion force on the fish top, the upper end of the fishing slip 4 radially expands outwards, the dropped fish is gripped by the elastic force of the upper end of the fishing slip 4 to provide initial pre-tightening force, under the action of the pre-tightening force, the fishing pipe column is lifted, the upper end of the fishing slip 4 grips the outer wall of the dropped fish and moves downwards relative to the outer cylinder 3, in the process that the fishing slip 4 moves downwards, the lower end of the fishing slip 4 is squeezed towards the inner contraction after being pressed by the conical surface of, continuously lifting the salvaging pipe column to finish the salvaging operation of the coiled tubing; then, if the coiled tubing is stuck in the well and the fishing string cannot be lifted, a proper lifting load can be increased, the fishing string is continuously lifted to circularly release the fishing string, the fishing slips 4 and the slip seat 5 move downwards relative to the outer cylinder 3 along with the increase of the lifting load, because the lifting load does not reach the shearing force sheared by the shear pin 6 at the moment, the slip seat 5 moving downwards relative to the outer cylinder 3 and the cutting press ring 18 which is kept immovable relative to the outer cylinder 3 extrude the sealing rubber cylinder 17, so that the sealing rubber cylinder 17 generates elastic deformation, the outer side of the extruded and deformed sealing rubber cylinder 17 is tightly attached to the inner wall of the outer cylinder 3, the inner side of the extruded and deformed sealing rubber cylinder 17 is tightly attached to the outer wall of the fished coiled tubing, at the moment, the elastic deformation of the sealing rubber cylinder 17 is maintained by keeping the lifting load, namely, the sealing between the inner wall of the outer cylinder 3, then, pumping fluid into the salvaging pipe column from the ground, wherein the fluid can circulate into the salvaged continuous oil pipe, so as to realize the large-displacement circular washing or hot washing of the salvaged oil pipe, the bottom tool and the stuck point; through the large-displacement circular washing or hot washing, the blockage and blockage removal of the salvaged coiled tubing can be effectively implemented, the blockage and blockage removal success rate is improved, and after the blockage removal is successful, the salvage pipe column is continuously lifted to complete the salvage operation of the coiled tubing; finally, if the coiled tubing is stuck in the well and the salvage pipe column can not be lifted after the coiled tubing is circularly unfreezed, the salvage pipe column is continuously lowered until the target position needing to be cut, namely the position of the clamping point, the fishing pipe column is lifted, so that the annular slip teeth at the lower part of the fishing slip 4 bite the outer wall of the fallen fish again, at the moment, the fishing pipe column is continuously lifted, the lifting load is further increased, when the downward stress of the cutting press ring 18 reaches the shearing force of the shearing nail 6, the shearing nail 6 is sheared, at the moment, the cutting press ring 18 continues to push the shearing slip 7 downwards to move, the lower end of the shearing slip 7 is squeezed by the conical surface of the first conical hole 15 and then shrinks inwards, the shearing teeth act on the outer wall of the coiled tubing to be salvaged, the shearing force of the shearing teeth is in direct proportion to the lifting load, the fishing pipe column continues to be lifted to increase the lifting load until the coiled tubing to be salvaged is sheared, and therefore the fishing operation of the coiled tubing to be salvaged is completed.
The coiled tubing sealed circulation unfreezing device can be further optimized or/and improved according to actual needs:
as shown in fig. 1 and 2, two outer annular grooves 19 are distributed at intervals up and down on the outer side of the sealing rubber tube 17, and an inner annular groove 20 is arranged on the inner side of the middle part of the sealing rubber tube 17 corresponding to the position between the two outer annular grooves 19. During the use, through setting up outer annular groove 19 and interior annular groove 20, be convenient for the packing rubber tube 17 take place the deformation after the pressurized.
As shown in fig. 1 and 2, the outer annular groove 19 has a V-shaped cross section, and the inner annular groove 20 has a U-shaped cross section. In the use process, the sealing rubber tube 17 which is deformed after being pressed has better sealing effect through the arrangement.
As shown in the attached figures 1 and 2, the salvaging slips 4 comprises a conical cylinder and a straight cylinder, the conical cylinder is in a hollow round platform shape with a small upper part and a big lower part, the straight cylinder is in a hollow cylindrical shape, the lower end of the conical cylinder is fixedly installed with the upper end of the straight cylinder, the upper end of the salvaging slips 4 is evenly provided with at least three upper long openings with the lower ends positioned on the upper part of the straight cylinder along the circumference, and the lower end of the salvaging slips 4 corresponding to the position between every two adjacent upper long openings is provided with a lower long opening with the upper end positioned on the lower part of the. In the using process, the upper part of the salvaging slips 4 forms a plurality of split elastic structures by arranging the upper long opening on the conical cylinder, so that the inner side of the upper part of the salvaging slips 4 can be radially expanded outwards when being subjected to outwards extrusion force; the lower part of the salvaging slips 4 forms a plurality of split elastic structures by arranging the lower long opening on the straight column barrel, so that the outer side of the lower part of the salvaging slips 4 can radially contract inwards when being subjected to inward extrusion force; thereby completing the fishing operation of the coiled tubing through the annular slip teeth on the inner side of the fishing slip 4.
As shown in attached figures 1 and 2, the shearing slip 7 is hollow and cylindrical, and at least three strip openings with upper ends located in the middle of the shearing slip 7 are uniformly distributed at the lower end of the shearing slip 7 along the circumference. In the using process, the lower part of the shearing slip 7 forms a plurality of split elastic structures by arranging the strip openings on the shearing slip 7, so that the outer side of the lower part of the shearing slip 7 can contract inwards in the radial direction when being subjected to inwards extrusion force; thereby completing the shearing operation of the coiled tubing by shearing the shearing teeth inside the slips 7.
As shown in fig. 1 and 2, two pins 10 are fixedly mounted on the outer side of the upper part of the spiral outer cylinder 11. In the use process, the arrangement improves the stability of the pin 10 moving up and down in the rotating groove 14, so that the spiral outer cylinder 11 can rotate relative to the spiral inner cylinder 8 more stably and reliably.
As shown in the attached drawings 1 and 2, the outer side of the lower end of the upper joint 1 is fixedly installed with the inner side of the upper end of the adapter 2 through threaded connection, the outer side of the lower end of the adapter 2 is fixedly installed with the inner side of the upper end of the outer cylinder 3 through threaded connection, the outer side of the lower end of the outer cylinder 3 is fixedly installed with the inner side of the upper end of the spiral inner cylinder 8 through threaded connection, and the outer side of the lower end of the spiral outer cylinder 11 is fixedly installed with the inner side of the upper end of the. The arrangement facilitates the disassembly and assembly of the components of the invention during use.
As shown in the attached figures 1 and 2, the coiled tubing sealed circulating stuck freeing method using the coiled tubing sealed circulating stuck freeing device comprises the following steps:
(1) fixedly installing the upper joint 1 and the lower end of the fishing pipe column together, and lowering the fishing pipe column to start fishing operation;
(2) after the guide shoe 12 contacts the fish top, the pin 10 moves upwards in the rotating groove 14, so that the spiral outer cylinder 11 rotates relative to the spiral inner cylinder 8, and the guide shoe 12 rotates along with the spiral outer cylinder 11, and the fish top is guided into the guide shoe 12;
(3) after the guide shoe 12 is introduced into the fish top, the fishing pipe column is lowered, and the fish top sequentially passes through the spiral outer cylinder 11, the spiral inner cylinder 8, the outer cylinder 3, the shearing slip 7, the cutting press ring 18, the sealing rubber cylinder 17, the slip seat 5 and the fishing slip 4;
(4) the fishing pipe column is continuously lowered, the fish top continuously moves upwards, and when the fish top contacts the inner side of the upper end of the fishing slip 4 and generates outward extrusion force on the fishing slip, the upper end of the fishing slip 4 is radially expanded outwards;
(5) the self elastic force of the upper end of the fishing slip 4 grabs the fish to provide initial pretightening force, under the pretightening force, the fishing pipe column is lifted, and the upper end of the fishing slip 4 grabs the outer wall of the fish to move downwards relative to the outer barrel 3;
(6) in the process that the salvaging slips 4 move downwards, the lower end of the salvaging slips 4 is squeezed by the conical surface of the second taper hole 16 and then is contracted inwards, the outer wall of the fallen fish is tightly bitten by the annular slip teeth at the lower part of the salvaging slips 4, and the salvaging pipe column is continuously lifted to finish the salvaging operation of the continuous oil pipe;
(7) if the coiled tubing is clamped underground and the fishing string cannot be lifted, appropriate lifting load can be increased, and the fishing string is continuously lifted for cyclic unfreezing;
(8) along with the increase of the lifting load, the fishing slips 4 and the slip seat 5 move downwards relative to the outer cylinder 3, and because the lifting load does not reach the shearing force sheared by the shear pin 6, the slip seat 5 moving downwards relative to the outer cylinder 3 and the cutting press ring 18 which keeps immovable relative to the outer cylinder 3 extrude the sealing rubber cylinder 17, so that the sealing rubber cylinder 17 is elastically deformed;
(9) the outer side of the sealing rubber cylinder 17 subjected to extrusion deformation is tightly attached to the inner wall of the outer cylinder body 3, the inner side of the sealing rubber cylinder 17 subjected to extrusion deformation is tightly attached to the outer wall of the coiled tubing to be salvaged, at the moment, the elastic deformation of the sealing rubber cylinder 17 is maintained by keeping the lifting load, and the sealing between the inner wall of the outer cylinder body 3 and the outer wall of the coiled tubing to be salvaged is kept;
(10) pumping fluid into the salvaging pipe column from the ground, wherein the fluid can circulate into the salvaged continuous oil pipe, so as to realize the large-displacement circular washing or hot washing of the salvaged oil pipe, a bottom machine tool and a stuck point;
(11) through the large-displacement circular washing or hot washing, the blockage and blockage removal of the salvaged coiled tubing can be effectively implemented, the blockage and blockage removal success rate is improved, and after the blockage removal is successful, the salvage pipe column is continuously lifted to complete the salvage operation of the coiled tubing;
(12) if the coiled tubing is clamped underground and the fishing pipe column cannot be lifted after cyclic unfreezing, continuing to lower the fishing pipe column until the target position needing to be cut is reached, namely the stuck point position;
(13) after reaching the clamping point, lifting the fishing pipe column, enabling the annular slip teeth at the lower part of the fishing slip 4 to bite the outer wall of the fallen fish again, continuing to lift the fishing pipe column at the moment, and further increasing the lifting load;
(14) when the downward stress of the cutting press ring 18 reaches the shearing force of the shearing nail 6, the shearing nail 6 is sheared, at the moment, the cutting press ring 18 continues to push the shearing slip 7 downwards, the lower end of the shearing slip 7 is squeezed by the conical surface of the first conical hole 15 and then contracts inwards, and the shearing teeth act on the outer wall of the coiled tubing to be salvaged;
(15) and continuously lifting the fishing pipe column to increase the lifting load until the coiled tubing to be fished is sheared, thereby completing the fishing operation of the coiled tubing to be fished.
The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and unnecessary technical features can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (9)
1. A continuous oil pipe sealing circulation unfreezing device is characterized by comprising an upper joint, a conversion joint, an outer barrel, a salvaging slip, a slip seat, a sealing rubber barrel, a cutting press ring, a shear pin, a shearing slip, a spiral inner barrel, a spring, a pin, a spiral outer barrel and a guide shoe, wherein the outer side of the lower end of the upper joint is fixedly arranged with the inner side of the upper end of the conversion joint; the middle part of the outer cylinder body is provided with a fishing and cutting channel which is communicated up and down, the fishing and cutting channel comprises a first straight hole, a first taper hole and a second straight hole which are communicated in sequence from top to bottom, and the first taper hole is a taper hole with a large top and a small bottom; a cutting press ring is fixedly arranged in a first straight hole corresponding to the inner side position of the middle part of the outer barrel body through a shear pin, a salvaging slip, a slip seat and a sealing rubber barrel are sequentially arranged above the cutting press ring from top to bottom, the lower end seat of the sealing rubber barrel is arranged at the upper end of the cutting press ring, the lower end seat of the slip seat is arranged at the upper end of the sealing rubber barrel, a second taper hole which is communicated from top to bottom is arranged in the middle of the slip seat, the second taper hole is a taper hole with a big top and a small bottom, the lower end seat of the salvaging slip is arranged at the inner side of the upper part of the second taper hole, the inner side of the upper part of the salvaging slip can radially expand outwards when being subjected to outward extrusion force, the outer side of the lower part of the salvaging slip can radially contract inwards when being subjected to inward extrusion force, annular slip teeth are arranged at the inner side of the salv, the inner side of the lower part of the shearing slip is provided with a shearing tooth, the shearing slip is positioned below the cutting press ring, and the outer diameter of the upper end of the shearing slip is larger than the inner diameter of the lower end of the cutting press ring; a limiting ring table is arranged on the outer side of the upper end of the spiral inner barrel, a spring is sleeved on the outer side of the spiral inner barrel corresponding to the position between the limiting ring table and the spiral outer barrel, the upper end of the spring is abutted against the lower end of the limiting ring table, and the lower end of the spring is abutted against the upper end of the spiral outer barrel; at least one pin is fixedly installed on the outer side of the upper part of the spiral outer barrel, the axis of the pin is vertical to the axis of the spiral outer barrel, a rotary groove capable of enabling the rotary pin to move up and down in the rotary groove is formed in the outer side of the spiral inner barrel corresponding to the position below the limiting ring table, the rotary groove is spiral, and the inner ends of the pins are located in the rotary groove; two outer ring grooves are distributed at intervals from top to bottom on the outer side of the sealing rubber cylinder, and an inner ring groove is arranged on the inner side of the middle part of the sealing rubber cylinder corresponding to the position between the two outer ring grooves.
2. The coiled tubing sealed circulation unfreezing device of claim 1, wherein the fishing slips comprise a conical cylinder and a straight cylinder, the conical cylinder is in a hollow circular truncated cone shape with a small upper part and a large lower part, the straight cylinder is in a hollow cylindrical shape, the lower end of the conical cylinder is fixedly installed with the upper end of the straight cylinder, at least three upper long openings with lower ends located at the upper part of the straight cylinder are evenly distributed at the upper end of the fishing slips along the circumference, and lower long openings with upper ends located at the lower part of the conical cylinder are arranged at the lower ends of the fishing slips corresponding to the positions between every two adjacent upper long openings.
3. The coiled tubing sealed circulation unfreezing device according to claim 1 or 2, wherein the shearing slips are hollow cylindrical, and at least three strip openings with upper ends located in the middle of the shearing slips are evenly distributed at the lower ends of the shearing slips along the circumference.
4. The coiled tubing sealed circulation unfreezing device according to claim 1 or 2, wherein two pins are fixedly installed on the outer side of the upper portion of the spiral outer cylinder.
5. The coiled tubing sealed circulation unfreezing device of claim 3, wherein two pins are fixedly mounted on the outer side of the upper portion of the spiral outer cylinder.
6. The coiled tubing sealed circulation unfreezing device according to claim 1, 2 or 5, characterized in that the outer side of the lower end of the upper joint is fixedly installed with the inner side of the upper end of the adapter through threaded connection, the outer side of the lower end of the adapter is fixedly installed with the inner side of the upper end of the outer cylinder through threaded connection, the outer side of the lower end of the outer cylinder is fixedly installed with the inner side of the upper end of the spiral inner cylinder through threaded connection, and the outer side of the lower end of the spiral outer cylinder is fixedly installed with the inner side of the upper end of the.
7. The coiled tubing sealed circulation unfreezing device according to claim 3, wherein the outer side of the lower end of the upper joint is fixedly installed with the inner side of the upper end of the adapter through threaded connection, the outer side of the lower end of the adapter is fixedly installed with the inner side of the upper end of the outer cylinder through threaded connection, the outer side of the lower end of the outer cylinder is fixedly installed with the inner side of the upper end of the spiral inner cylinder through threaded connection, and the outer side of the lower end of the spiral outer cylinder is fixedly installed with the inner side of the upper end of the guide shoe.
8. The coiled tubing sealed circulation unfreezing device of claim 4, wherein the outer side of the lower end of the upper joint is fixedly installed with the inner side of the upper end of the adapter through threaded connection, the outer side of the lower end of the adapter is fixedly installed with the inner side of the upper end of the outer cylinder through threaded connection, the outer side of the lower end of the outer cylinder is fixedly installed with the inner side of the upper end of the spiral inner cylinder through threaded connection, and the outer side of the lower end of the spiral outer cylinder is fixedly installed with the inner side of the upper end of the guide shoe through.
9. A coiled tubing seal cycle unchecking method using the coiled tubing seal cycle unchecker of any of claims 1-8, comprising the steps of:
(1) fixedly installing the upper joint and the lower end of the fishing pipe column together, and lowering the fishing pipe column to start fishing operation;
(2) after the guide shoe contacts the fish top, the pin moves upwards in the rotary groove to enable the spiral outer cylinder to rotate relative to the spiral inner cylinder, so that the guide shoe rotates along with the spiral outer cylinder, and the fish top is guided into the guide shoe;
(3) after the fish top is introduced into the guide shoe, the fishing pipe column is lowered, and the fish top sequentially passes through the spiral outer cylinder, the spiral inner cylinder, the outer cylinder, the shearing slip, the cutting press ring, the sealing rubber cylinder, the slip seat and the fishing slip;
(4) the fishing pipe column is continuously lowered, the fish top continuously moves upwards, and when the fish top contacts the inner side of the upper end of the fishing slip and generates outward extrusion force on the fishing slip, the upper end of the fishing slip is radially expanded outwards;
(5) the elastic force of the upper end of the fishing slip grips the fish to provide initial pretightening force, under the pretightening force, the fishing pipe column is lifted, and the upper end of the fishing slip grips the outer wall of the fish to move downwards relative to the outer barrel;
(6) in the process that the salvaging slips move downwards, the lower ends of the salvaging slips are squeezed by the conical surfaces of the second taper holes and then are contracted inwards, the outer walls of the fallen fishes are tightly bitten by the annular slip teeth at the lower parts of the salvaging slips, and the salvaging pipe column is continuously lifted to finish the salvaging operation of the continuous oil pipe;
(7) if the coiled tubing is clamped underground and the fishing string cannot be lifted, appropriate lifting load can be increased, and the fishing string is continuously lifted for cyclic unfreezing;
(8) the salvaging slips and the slip seat move downwards relative to the outer cylinder along with the increase of the lifting load, and the slip seat moving downwards relative to the outer cylinder and the cutting press ring which keeps immovable relative to the outer cylinder extrude the sealing rubber cylinder to enable the sealing rubber cylinder to generate elastic deformation because the lifting load does not reach the shearing force sheared by the shear pin;
(9) the outer side of the sealing rubber cylinder subjected to extrusion deformation is tightly attached to the inner wall of the outer cylinder body, the inner side of the sealing rubber cylinder subjected to extrusion deformation is tightly attached to the outer wall of the salvaged continuous oil pipe, and at the moment, the elastic deformation of the sealing rubber cylinder is maintained by keeping a lifting load, namely, the sealing between the inner wall of the outer cylinder body and the outer wall of the salvaged continuous oil pipe is kept;
(10) pumping fluid into the salvaging pipe column from the ground, wherein the fluid can circulate into the salvaged continuous oil pipe, so as to realize the large-displacement circular washing or hot washing of the salvaged oil pipe, a bottom machine tool and a stuck point;
(11) through the large-displacement circular washing or hot washing, the blockage and blockage removal of the salvaged coiled tubing can be effectively implemented, the blockage and blockage removal success rate is improved, and after the blockage removal is successful, the salvage pipe column is continuously lifted to complete the salvage operation of the coiled tubing;
(12) if the coiled tubing is clamped underground and the fishing pipe column cannot be lifted after cyclic unfreezing, continuing to lower the fishing pipe column until the target position needing to be cut is reached, namely the stuck point position;
(13) after reaching the clamping point, lifting the fishing pipe column, enabling the annular slip teeth at the lower part of the fishing slip to bite the outer wall of the fish again, continuing to lift the fishing pipe column at the moment, and further increasing the lifting load;
(14) when the downward stress of the cutting press ring reaches the shearing force of the shearing of the shear pin, the shear pin is sheared, the cutting press ring continues to push the shearing slip downwards at the moment, the lower end of the shearing slip is extruded by the conical surface of the first conical hole and then contracts inwards, and the shearing teeth act on the outer wall of the coiled tubing to be salvaged;
(15) and continuously lifting the fishing pipe column to increase the lifting load until the coiled tubing to be fished is sheared, thereby completing the fishing operation of the coiled tubing to be fished.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910969419.0A CN110748317A (en) | 2019-10-12 | 2019-10-12 | Coiled tubing sealed circulating stuck freeing device and coiled tubing sealed circulating stuck freeing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910969419.0A CN110748317A (en) | 2019-10-12 | 2019-10-12 | Coiled tubing sealed circulating stuck freeing device and coiled tubing sealed circulating stuck freeing method |
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| CN110748317A true CN110748317A (en) | 2020-02-04 |
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| CN201910969419.0A Pending CN110748317A (en) | 2019-10-12 | 2019-10-12 | Coiled tubing sealed circulating stuck freeing device and coiled tubing sealed circulating stuck freeing method |
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| US5054833A (en) * | 1990-01-02 | 1991-10-08 | Herschel E. Zirger | Releasable overshot |
| CN203097792U (en) * | 2012-11-30 | 2013-07-31 | 中国石油集团川庆钻探工程有限公司 | Rotary downhole fishing device for coiled tubing |
| CN105401902A (en) * | 2015-12-22 | 2016-03-16 | 东营和辉石油技术有限责任公司 | Cable salvage tool used in oil and gas well |
| CN108533202A (en) * | 2018-05-14 | 2018-09-14 | 中国石油天然气集团公司 | Coiled tubing cuts unfreezing fishing device |
| CN108533203A (en) * | 2018-05-14 | 2018-09-14 | 中国石油天然气集团公司 | The integrated apparatus of multifunctional comprehensive unfreezing fishing coiled tubing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5054833A (en) * | 1990-01-02 | 1991-10-08 | Herschel E. Zirger | Releasable overshot |
| CN203097792U (en) * | 2012-11-30 | 2013-07-31 | 中国石油集团川庆钻探工程有限公司 | Rotary downhole fishing device for coiled tubing |
| CN105401902A (en) * | 2015-12-22 | 2016-03-16 | 东营和辉石油技术有限责任公司 | Cable salvage tool used in oil and gas well |
| CN108533202A (en) * | 2018-05-14 | 2018-09-14 | 中国石油天然气集团公司 | Coiled tubing cuts unfreezing fishing device |
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Application publication date: 20200204 |