CN118008186A - Fishing device and fishing method for broken drill bit in geothermal well drilling process - Google Patents
Fishing device and fishing method for broken drill bit in geothermal well drilling process Download PDFInfo
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- CN118008186A CN118008186A CN202410425398.7A CN202410425398A CN118008186A CN 118008186 A CN118008186 A CN 118008186A CN 202410425398 A CN202410425398 A CN 202410425398A CN 118008186 A CN118008186 A CN 118008186A
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- main body
- drill bit
- boss
- lifting
- driving assembly
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000005553 drilling Methods 0.000 title claims abstract description 18
- 210000000078 claw Anatomy 0.000 claims abstract description 51
- 238000003466 welding Methods 0.000 claims abstract description 49
- 239000003832 thermite Substances 0.000 claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 239000011435 rock Substances 0.000 claims description 23
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 238000000926 separation method Methods 0.000 claims description 12
- 238000007133 aluminothermic reaction Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000005489 elastic deformation Effects 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 238000003491 array Methods 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 238000000354 decomposition reaction Methods 0.000 claims description 2
- 241000276425 Xiphophorus maculatus Species 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- ZJRXSAYFZMGQFP-UHFFFAOYSA-N barium peroxide Chemical compound [Ba+2].[O-][O-] ZJRXSAYFZMGQFP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Landscapes
- Earth Drilling (AREA)
Abstract
The invention relates to a salvaging device and a salvaging method after a drill bit is disassembled in the geothermal well drilling process, and belongs to the technical field of drill bit salvaging; the device comprises a driving assembly, a salvaging main body and a lifting boss, wherein the driving assembly is arranged at a wellhead of a geothermal well, the salvaging main body is positioned in the geothermal well, the salvaging main body is connected with the driving assembly through a lifting sling and a loop bar, the driving assembly controls the salvaging main body to lift through the lifting sling, and the driving assembly controls the salvaging main body to rotate through the loop bar; three lifting bosses in circular array are arranged in the salvage main body, each lifting boss is independently connected in the salvage main body in a sliding manner along the vertical direction, a welding cavity with an opening at the lower end is detachably arranged at the lower end of each lifting boss, an inner claw is arranged at the lower end of the welding cavity, a rebounding outer claw is arranged at the outer side of the inner claw, and an electronic spark plug and thermite are arranged in the welding cavity; the problem of the drill bit salvage success rate after having solved the present disintegration lower, unable disposable salvage is solved.
Description
Technical Field
The invention belongs to the technical field of drill bit salvage, and particularly relates to a salvage device and salvage method for a broken drill bit in a geothermal well drilling process.
Background
In the process of drilling a geothermal well, as the drilling depth is continuously increased, the encountered stratum situation is more and more complex, and the problems are more and more faced, wherein the salvaging after the drill bit is disassembled is one of the problems. In the drilling process, when encountering broken stratum, the roller bit is easy to collapse and disintegrate under high temperature and high pressure and frequent mechanical vibration due to long-time drilling, is blocked in the broken stratum, and can not be taken out by lifting and releasing the drill rod. At present, a specific device which accords with the actual operation does not exist for the dropped drill bit, and a mechanical device is lowered by utilizing a steel wire rope to clamp the drill bit, then lifted, or a powerful magnet is lowered, and is sucked by using magnetic force and then lifted. The existing common method has the defects of high operation difficulty and small lifting force, and when the drill bit is broken and disintegrated and each part of the drill bit is firmly clamped by broken stratum, the mechanical device or magnetic force is used for clamping the drill bit, the fishing success rate is very low, each drill bit part is difficult to be fished at one time, and the construction progress is seriously influenced.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a salvaging device and a salvaging method after a drill bit is disassembled in the geothermal well drilling process; the problem that the success rate of the drill bit salvage after the disassembly is lower at present, and the disposable salvage can not be realized is solved.
In order to achieve the above purpose, the present invention is realized by the following technical scheme.
The salvaging device comprises a driving assembly, a salvaging main body and a lifting boss, wherein the driving assembly is arranged at a wellhead of a geothermal well, the salvaging main body is positioned in the geothermal well, the salvaging main body is connected with the driving assembly through a lifting sling and a loop bar, the driving assembly controls the salvaging main body to lift through the lifting sling, and the driving assembly controls the salvaging main body to rotate through the loop bar; the novel salvage device comprises a salvage main body, wherein three circular array lifting bosses are arranged inside the salvage main body, each lifting boss is independently connected inside the salvage main body in a sliding mode along the vertical direction, a welding cavity with an opening at the lower end is detachably arranged at the lower end of each lifting boss, an inner claw is arranged at the lower end of the welding cavity, a rebounding outer claw is arranged at the outer side of the inner claw, and an electronic spark plug and thermite are arranged inside the welding cavity.
Further, a ground support is arranged at the wellhead of the geothermal well, and the driving assembly is arranged on the ground support.
Further, the salvaging main body comprises a main shaft, a main body cylinder cavity, a sling connecting ring and boss separating spokes; the main body cylinder cavity is of a cylindrical structure with the upper end and the lower end kept open; three round array sling connecting rings are fixedly arranged at the upper end of the side wall of the main body cylinder cavity, and the lower end of the lifting sling is connected with the sling connecting rings; a main shaft is arranged at the center of an opening at the upper end of the main body cylinder cavity; three vertical sliding grooves in circular arrays are arranged on the outer cylindrical surface of the main shaft.
Further, the upper end of the inner wall of the main body cylinder cavity is fixedly connected with the lower end of the outer wall of the main shaft through three boss separation spokes in a circular array, and each boss separation spoke is arranged along the radial direction of the main body cylinder cavity; the upper end opening of the main body cylinder cavity is divided into three sector-shaped through holes in a circular array through three boss separation spokes, and each chute corresponds to one sector-shaped through hole.
Further, a rotating rod is fixedly arranged at the upper end of the side wall of the main shaft, the lower end of the sleeve rod is fixedly inserted into the rotating rod, and the upper end of the sleeve rod is connected with the driving assembly; the sleeve rod, the rotating rod and the main shaft are of cylindrical structures with openings at the upper end and the lower end, and the cable sequentially passes through the sleeve rod, the rotating rod, the main shaft and the three lifting bosses and is respectively connected with the electronic spark plugs in the three welding cavities.
Further, a lifting boss is arranged in each fan-shaped through hole of the main body barrel cavity, and the three lifting bosses have the same structure; the lifting boss comprises a boss main body, a sliding block and a connecting seat, wherein the boss main body is of a fan-shaped block structure, the horizontal section of the boss main body is of a fan-shaped shape, a vertical sliding block is fixedly arranged in the middle of the inner circular arc edge of the upper end face of the boss main body, and the sliding block is in sliding clamping connection with the inside of a corresponding sliding groove along the vertical direction.
Further, the connecting seat is fixedly arranged at the lower end face of the boss main body, the connecting seat is of a sector-shaped block structure, the horizontal section of the connecting seat is of a sector shape, the welding cavity is detachably arranged at the lower end face of the connecting seat, and the welding cavity is of a sector-shaped cylindrical structure formed by surrounding an inner circular arc-shaped side wall, an outer circular arc-shaped side wall and rectangular plane side walls at two sides.
Further, a row of inner clamping claws are arranged on the lower end face of the outer circular arc-shaped side wall of the welding cavity; a row of outer clamping claws are arranged at the lower end face of the boss main body at the outer side of the connecting seat, the outer clamping claws are of a vertically arranged wedge-shaped plate structure, the width of the lower ends of the outer clamping claws is smaller than that of the upper ends of the outer clamping claws, the upper ends of the outer clamping claws extend to the outer side of the boss main body, clamping hooks are fixedly arranged at the inner side of the lower ends of the outer clamping claws, and the tips of the clamping hooks face the axial line of the main body barrel cavity; the outer clamping claw is made of stainless steel materials, has elasticity and can be expanded outwards to generate elastic deformation.
Furthermore, the thermite is a mixture composed of aluminum powder, ferroferric oxide and combustion improver.
A salvaging method of a salvaging device after a drill bit is disassembled in the geothermal well drilling process comprises the following steps:
the first step: firstly, determining the relative position of a broken stratum clamped at the bottom of a geothermal well after the drill bit is cracked and decomposed;
And a second step of: the welding cavity is arranged on the lifting bosses, the three lifting bosses are respectively arranged on the salvaging main body, the loop bar is respectively connected with the salvaging main body and the driving assembly, and the salvaging main body is connected with the driving assembly through the lifting sling;
and a third step of: the salvaging main body is lowered through the driving assembly, and the salvaging main body is controlled to rotate through the driving assembly until the outer clamping claw and the inner clamping claw are contacted with each decomposition part of the drill bit;
Fourth step: the salvaging main body is continuously lowered through the driving assembly, the outer clamping claw is outwards expanded to elastically deform under the action of the self weight of the whole device and the lifting sling, and the clamping hook at the lower end of the outer clamping claw is embedded into a gap between the drill bit and the stratum, so that the decomposed drill bit is clamped;
Fifth step: electrifying the electronic spark plug through a cable, starting aluminothermic reaction in the welding cavity, forming molten iron in a molten state in the aluminothermic reaction process, filling the molten iron into the welding cavity and into a sealed space of a rock layer at the upper end, the side surface and the bottom of the drill bit, wherein the molten iron is filled into a gap between the drill bit and the rock layer because the rock is a hot poor conductor, and welding the whole device and the decomposed drill bit into a firmly-adhered permanent joint after waiting for cooling of the molten iron; on the other hand, a large amount of heat is released in the aluminothermic reaction process, so that rocks outside the drill bit and rock scraps inside the drill bit start to melt and break, the stratum where the drill bit is positioned starts to loosen, the decomposed drill bit loosens in the stratum, and the decomposed drill bit is convenient to pull out;
Sixth step: the driving assembly ascends integrally through the lifting sling control device, and as the integral device and the decomposed drill bit form a permanent joint which is firmly bonded, the decomposed drill bit can be directly fished out of the geothermal well; and after the well is fished out, the welding cavity is detached from the lifting boss.
Compared with the prior art, the invention has the following beneficial effects:
Compared with the traditional drill bit salvaging device, the device not only has the clamping force of the mechanical outer clamping jaw and the mechanical inner clamping jaw on the drill bit, but also provides the bonding force between the device and the drill bit, wherein the bonding force is relative to the drill bit and cannot bond with rock strata. And when the device is lifted, rock stratum and internal rock scraps where the drill bit is located are melted, and the rock stratum is thermally broken, so that the rock stratum of the blocked stratum is loosened, the drill bit is loosened in the stratum, and the salvaging success rate of the drill bit blocked by the rock stratum is greatly improved. And the thermite welding technology is adopted, the device is simple, and most importantly, the device has own oxygen supply, so that the device is particularly suitable for underground low-oxygen environments.
Drawings
The invention is described in further detail below with reference to the accompanying drawings:
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram I of the connection between the salvage body, the lifting boss and the welding cavity;
FIG. 3 is a second schematic diagram of the connection between the salvage body, the lifting boss and the welding cavity;
FIG. 4 is a third schematic diagram of the connection between the salvage body, lifting boss and welding cavity;
FIG. 5 is a schematic diagram of the connection between the salvage body, lifting boss and welding cavity;
FIG. 6 is a schematic view of the fishing body;
FIG. 7 is a schematic diagram of the connection between the lifting boss and the bonding cavity;
FIG. 8 is a second schematic diagram of the connection between the lifting boss and the welding cavity;
The device comprises a geothermal well 1, a ground support 2, a driving component 3, a salvaging main body 4, a main body cylinder cavity 401, a main shaft 402, a sliding chute 403, a boss separating spoke 404, a sling connecting ring 405, a rotating rod 5, a loop bar 6, a lifting sling 7, a lifting boss 8, a boss main body 801, a sliding block 802, a mud guard 803, a connecting seat 804, a welding cavity 9, an inner circular arc-shaped side wall 901, an outer circular arc-shaped side wall 902, a rectangular plane side wall 903, an inner claw 904, an outer claw 905, a clamping hook 906, an electronic spark plug 907 and a drill bit 10.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail by combining the embodiments and the drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. The following describes the technical scheme of the present invention in detail with reference to examples and drawings, but the scope of protection is not limited thereto.
As shown in fig. 1-8, the invention provides a salvaging device after a drill bit is disassembled in the geothermal well drilling process, which comprises a driving component 3, a lifting sling 7, a loop bar 6, a rotating rod 5, a salvaging main body 4 and a lifting boss 8.
A ground support 2 is arranged at the wellhead of the geothermal well 1, and a driving assembly 3 is arranged on the ground support 2, wherein the driving assembly 3 is positioned above the wellhead of the geothermal well 1.
The fishing main body 4 comprises a main shaft 402, a main body barrel cavity 401, a sling connecting ring 405 and boss separating spokes 404.
The main body cylinder 401 has a cylindrical structure with its upper and lower ends kept open. Three circular arrays of sling attachment rings 405 are fixedly disposed on the upper ends of the side walls of the body barrel 401. A main shaft 402 is arranged at the center of an opening at the upper end of the main body cylinder cavity 401, the main shaft 402 is of a cylindrical structure with the upper end and the lower end kept open, and the upper end of the main shaft 402 extends out of the opening at the upper end of the main body cylinder cavity 401; three circular arrays of sliding grooves 403 are arranged on the outer cylindrical surface of the main shaft 402, and the sliding grooves 403 are vertically arranged.
The upper end of the inner wall of the main body cylinder 401 is fixedly connected with the lower end of the outer wall of the main shaft 402 through three boss separation spokes 404 in a circular array, each boss separation spoke 404 is arranged along the radial direction of the main body cylinder 401, one end of the outer side of the boss separation spoke 404 is fixedly connected with the upper end of the inner wall of the main body cylinder 401, and one end of the inner side of the boss separation spoke 404 is fixedly connected with the lower end of the outer wall of the main shaft 402; the upper end opening of the main body cylinder cavity 401 is divided into three sector-shaped through holes in a circular array through three boss separation spokes 404, each chute 403 is positioned in the middle of two adjacent boss separation spokes 404, and each chute 403 corresponds to one sector-shaped through hole.
A rotating rod 5 is fixedly arranged at the upper end of the side wall of the main shaft 402, the rotating rod 5 is of a cylindrical structure with the upper end and the lower end kept open, and the inner space of the rotating rod 5 is communicated with the inner space of the main shaft 402. The loop bar 6 is a hollow rod-shaped structure with the upper end and the lower end kept open, the lower end of the loop bar 6 is inserted into the rotating rod 5 and fixedly connected with the rotating rod 5, the inner space of the loop bar 6 is communicated with the inner space of the main shaft 402, and the loop bar 6 drives the rotating rod 5 and the salvaging main body 4 to synchronously rotate.
The driving component 3 is fixedly connected with three sling connecting rings 405 at the upper end of the main body cylinder cavity 401 through three lifting slings 7, and the driving component 3 controls the whole device to lift through the three lifting slings 7.
The upper end of the loop bar 6 is connected with the driving component 3, the driving component 3 drives the loop bar 6 to rotate, and the loop bar 6 drives the rotating rod 5 and the salvaging main body 4 to synchronously rotate.
One lifting boss 8 is arranged inside each fan-shaped through hole of the main body barrel cavity 401, and the three lifting bosses 8 are identical in structure and are arranged in a circular array. The lifting boss 8 comprises a boss main body 801, a sliding block 802, a mud guard 803, a connecting seat 804, a welding cavity 9, an electronic spark plug 907, an inner clamping claw 904 and an outer clamping claw 905.
The boss main body 801 is a sector block structure, and the horizontal section of the boss main body 801 is sector-shaped, i.e. the boss main body 801 is a block structure formed by surrounding a horizontal sector plane at the upper end, a horizontal sector plane at the lower end, vertical rectangular planes at two sides, an outer arc surface and an inner arc surface. The upper end of each boss main body 801 extends to the outer side of the upper end opening of the main body barrel cavity 401 from the corresponding fan-shaped through hole, the inner circular arc surface of the boss main body 801 is attached to the outer cylindrical surface of the main shaft 402, and the outer circular arc surface of the boss main body 801 is attached to the inner cylindrical surface of the main body barrel cavity 401.
A vertical sliding block 802 is fixedly arranged in the middle of the inner circular arc edge of the upper end face of the boss main body 801, the sliding block 802 extends out of the inner circular arc face of the boss main body 801, the sliding block 802 is clamped inside the corresponding sliding groove 403 in a sliding manner along the vertical direction, and the outer side faces of the two sides of the sliding block 802 are respectively attached to the inner walls of the two sides of the sliding groove 403, so that the boss main body 801 can only lift relative to the main shaft 402 and cannot rotate relative to the main shaft 402.
A fender 803 is provided on the side of the slider 802, which is close to the outer circular arc surface of the boss body 801, and the fender 803 is fixedly provided on the upper end surface of the boss body 801. The mud guard 803 has a circular arc plate-like structure, and an axis of the mud guard 803 coincides with an axis of the boss main body 801. The slider 802 is located inside the fender 803, and the slider 802 is protected by the fender 803.
A connecting seat 804 is fixedly arranged at the lower end face of the boss main body 801, the connecting seat 804 is in a sector-shaped block structure, the horizontal section of the connecting seat 804 is in a sector shape, namely, the connecting seat 804 is in a block structure formed by surrounding a horizontal sector plane at the upper end, a horizontal sector plane at the lower end, vertical rectangular planes at two sides, an outer arc surface and an inner arc surface. The vertical rectangular planes on two sides of the connecting seat 804 coincide with the vertical rectangular planes on two sides of the boss main body 801, the inner arc surface of the connecting seat 804 is located on the inner side of the inner arc surface of the boss main body 801, and the outer arc surface of the connecting seat 804 is located on the inner side of the outer arc surface of the boss main body 801.
The welding cavity 9 with an opening at the lower end face of the connecting seat 804 is detachably arranged, the welding cavity 9 is of a fan-shaped cylindrical structure surrounded by an inner circular arc-shaped side wall 901, an outer circular arc-shaped side wall 902 and rectangular plane side walls 903 at two sides, the outer side face of the outer circular arc-shaped side wall 902 of the welding cavity 9 is overlapped with the outer circular arc face of the connecting seat 804, the outer side face of the inner circular arc-shaped side wall 901 of the welding cavity 9 is overlapped with the inner circular arc face of the connecting seat 804, and the outer side faces of the rectangular plane side walls 903 at two sides of the welding cavity 9 are positioned at the inner sides of vertical rectangular planes at two sides of the connecting seat 804. A row of inner claws 904 are provided at the lower end face of the outer circular arc-shaped side wall 902 of the welding cavity 9. The inner clamping claw 904 is made of alloy steel with high strength, high toughness and high melting point, and is not easy to generate elastic deformation.
A row of outer clamping claws 905 are arranged at the lower end face of the boss main body 801 at the outer side of the connecting seat 804, the outer clamping claws 905 are of a vertically arranged wedge-shaped plate structure, the width of the lower end of each outer clamping claw 905 is smaller than that of the upper end of each outer clamping claw 905, the upper ends of the outer clamping claws 905 extend to the outer side of the boss main body 801, clamping hooks 906 are fixedly arranged at the inner side of the lower end of each outer clamping claw 905, and the tips of the clamping hooks 906 face the axial line of the main body barrel cavity 401. The outer clamping claw 905 is made of stainless steel materials, and the outer clamping claw 905 has elasticity and can be expanded outwards to generate elastic deformation.
An electronic spark plug 907 is fixedly arranged on the inner top surface of the welding cavity 9.
A cable is inserted into the loop bar 6, and the cable passes through the loop bar 6, the rotating rod 5, the main shaft 402, the three boss main bodies 801 and the three connecting seats 804 in sequence and then is respectively connected with the electronic spark plugs 907 in the three welding cavities 9, so that high temperature can be instantaneously generated after the electronic spark plugs 907 are electrified through the cable.
Inside each welding cavity 9 is arranged a thermite which is a mixture of aluminum powder, ferroferric oxide and barium peroxide as combustion improver for thermite reaction.
The inner claw 904 is matched with the welding cavity 9 to increase the bonding area of the drill bit 10 and is matched with the outer claw 905 to improve the success rate of salvaging the decomposed drill bit 10.
The salvaging method of the salvaging device after the drill bit is disassembled in the geothermal well drilling process provided by the invention comprises the following steps:
the first step: first, the relative position of the broken stratum clamped at the bottom of the geothermal well 1 after the drill bit 10 is broken down and decomposed is determined.
And a second step of: the ground support 2 is fixed at the wellhead of the geothermal well 1, the welding cavity 9 is arranged on the lifting bosses 8, the three lifting bosses 8 are respectively arranged on the salvage main body 4, the loop bar 6 is respectively connected with the salvage main body 4 and the driving assembly 3, and the salvage main body 4 is connected with the driving assembly 3 through the lifting sling 7.
And a third step of: the fishing body 4 is lowered by the drive assembly 3 and the fishing body 4 is controlled to rotate by the drive assembly 3 until the outer and inner jaws 905, 904 contact the various break-up portions of the drill bit 10.
Because each lifting boss 8 is slidably connected with the main shaft 402 of the salvaging main body 4 through an independent sliding block 802, the three lifting bosses 8 can be lifted independently to adjust the respective height of each lifting boss 8, so that the outer claw 905 and the inner claw 904 at the lower end of each lifting boss 8 contact the drill bit 10 at different positions.
Fourth step: the salvaging main body 4 is continuously lowered through the driving assembly 3, the outer clamping claw 905 is outwards expanded to generate elastic deformation under the dead weight action of the whole device and the lifting sling 7, and the clamping hook 906 at the lower end of the outer clamping claw 905 is embedded into a gap between the drill bit 10 and the stratum, so that the decomposed drill bit 10 is clamped.
Fifth step: electrifying an electronic spark plug 907 through a cable, starting an aluminothermic reaction in the welding cavity 9, forming molten iron in a molten state in the aluminothermic reaction process, filling the molten iron into the welding cavity 9 and into a sealed space of a rock layer at the upper end, the side surface and the bottom of the drill bit 10, filling the molten iron in the molten state into a gap between the drill bit 10 and the rock layer because the rock is a hot poor conductor, and welding the whole device and the decomposed drill bit 10 into a firmly-bonded permanent joint after waiting for cooling of the molten iron; on the other hand, a great amount of heat is released in the aluminothermic reaction process, so that the rock outside the drill bit 10 and the rock scraps inside the drill bit 10 start to melt and crack, the stratum where the drill bit 10 is positioned starts to loosen, the decomposed drill bit 10 loosens in the stratum, and the decomposed drill bit 10 is conveniently pulled out.
The welding by thermite reaction is called thermite welding, the principle of which is to mix aluminum powder with ferroferric oxide according to the weight ratio of 1:3, and adding a proper amount of barium peroxide as a combustion improver. When heated and decomposed, oxygen is released, so that the reaction is more intense. The thermite reacts as follows: 8Al+3Fe 3O4=4Al2O3 +9Fe+795 kilocalories.
Sixth step: the driving assembly 3 is lifted by the lifting sling 7 to control the whole device, and the whole device and the decomposed drill bit 10 form a permanent joint which is firmly bonded, so that the decomposed drill bit 10 can be directly fished out of the geothermal well 1. After the well is fished out, the welding cavity 9 is detached from the lifting boss 8.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. A salvaging device after a drill bit is disassembled in the geothermal well drilling process is characterized in that: the automatic fishing device comprises a driving assembly (3), a fishing main body (4) and a lifting boss (8), wherein the driving assembly (3) is arranged at a wellhead of a geothermal well (1), the fishing main body (4) is positioned inside the geothermal well (1), the fishing main body (4) is connected with the driving assembly (3) through a lifting sling (7) and a loop bar (6), the driving assembly (3) controls the lifting of the fishing main body (4) through the lifting sling (7), and the driving assembly (3) controls the fishing main body (4) to rotate through the loop bar (6); inside three circular array's lift boss (8) are provided with in salvaging main part (4), every lift boss (8) independently along vertical direction sliding connection in salvaging main part (4) inside, it welds cavity (9) to be provided with lower extreme open-ended in every lift boss (8) lower extreme detachably, it is provided with interior jack catch (904) to apply the lower extreme that welds cavity (9), but interior jack catch (904) outside is provided with rebound outer jack catch (905), it is provided with electron spark plug (907) and thermite to apply welding cavity (9) inside.
2. The fishing device after the drill bit is disassembled in the geothermal well drilling process according to claim 1, wherein: a ground support (2) is arranged at a wellhead of the geothermal well (1), and the driving assembly (3) is arranged on the ground support (2).
3. The fishing device after the drill bit is disassembled in the geothermal well drilling process according to claim 1, wherein: the salvaging main body (4) comprises a main shaft (402), a main body cylinder cavity (401), a sling connecting ring (405) and boss separating spokes (404);
The main body cylinder cavity (401) is of a cylindrical structure with the upper end and the lower end kept open; three circular array sling connection rings (405) are fixedly arranged at the upper ends of the side walls of the main body barrel cavity (401), and the lower ends of lifting slings (7) are connected with the sling connection rings (405); a main shaft (402) is arranged at the center of an opening at the upper end of the main body cylinder cavity (401); three circular arrays of vertical sliding grooves (403) are arranged on the outer cylindrical surface of the main shaft (402).
4. A fishing device after the bit is disassembled in the geothermal well drilling process according to claim 3, wherein: the upper end of the inner wall of the main body cylinder cavity (401) is fixedly connected with the lower end of the outer wall of the main shaft (402) through three boss separation spokes (404) which are circularly arrayed, and each boss separation spoke (404) is arranged along the radial direction of the main body cylinder cavity (401); the upper end opening of the main body cylinder cavity (401) is divided into three circular array sector-shaped through holes by three boss separation spokes (404), and each chute (403) corresponds to one sector-shaped through hole respectively.
5. The fishing device after the drill bit is disassembled in the geothermal well drilling process according to claim 4, wherein: a rotating rod (5) is fixedly arranged at the upper end of the side wall of the main shaft (402), the lower end of the sleeve rod (6) is fixedly inserted into the rotating rod (5), and the upper end of the sleeve rod (6) is connected with the driving assembly (3); the sleeve rod (6), the rotating rod (5) and the main shaft (402) are of cylindrical structures with the upper end and the lower end kept open, and the cable sequentially passes through the sleeve rod (6), the rotating rod (5), the main shaft (402) and the three lifting bosses (8) downwards and is respectively connected with the electronic spark plugs (907) in the three welding cavities (9).
6. The fishing device of claim 5, wherein the fishing device is configured to: a lifting boss (8) is arranged in each fan-shaped through hole of the main body barrel cavity (401), and the three lifting bosses (8) have the same structure; the lifting boss (8) comprises a boss main body (801), a sliding block (802) and a connecting seat (804), wherein the boss main body (801) is of a fan-shaped block structure, the horizontal section of the boss main body (801) is fan-shaped, a vertical sliding block (802) is fixedly arranged in the middle of the inner circular arc edge of the upper end face of the boss main body (801), and the sliding block (802) is in sliding clamping connection with the inside of a corresponding sliding groove (403) along the vertical direction.
7. The fishing device of claim 6, wherein the fishing device is configured to: the connecting seat (804) is fixedly arranged at the lower end face of the boss main body (801), the connecting seat (804) is of a fan-shaped block structure, the horizontal section of the connecting seat (804) is of a fan-shaped surface, the welding cavity (9) is detachably arranged at the lower end face of the connecting seat (804), and the welding cavity (9) is of a fan-shaped cylindrical structure formed by surrounding an inner circular arc-shaped side wall (901), an outer circular arc-shaped side wall (902) and rectangular plane side walls (903) at two sides.
8. The fishing device of claim 7, wherein the fishing device is configured to: a row of inner claws (904) are arranged on the lower end surface of the outer circular arc-shaped side wall (902) of the welding cavity (9); a row of outer clamping claws (905) are arranged at the lower end face of a boss main body (801) at the outer side of the connecting seat (804), the outer clamping claws (905) are of a vertically arranged wedge-shaped platy structure, the width of the lower end of each outer clamping claw (905) is smaller than that of the upper end of each outer clamping claw (905), the upper ends of the outer clamping claws (905) extend to the outer side of the boss main body (801), clamping hooks (906) are fixedly arranged at the inner side of the lower end of each outer clamping claw (905), and the tips of the clamping hooks (906) face the axial line of the main body barrel cavity (401); the outer clamping claw (905) is made of stainless steel materials, and the outer clamping claw (905) has elasticity and can be expanded outwards to generate elastic deformation.
9. The fishing device after the drill bit is disassembled in the geothermal well drilling process according to claim 1, wherein: the thermite is a mixture composed of aluminum powder, ferroferric oxide and combustion improver.
10. The method of claim 8, comprising the steps of:
The first step: firstly, determining the relative position of broken stratum clamped at the bottom of a geothermal well (1) after the drill bit (10) is cracked and decomposed;
And a second step of: the welding cavity (9) is arranged on the lifting bosses (8), the three lifting bosses (8) are respectively arranged on the salvage main body (4), the loop bar (6) is respectively connected with the salvage main body (4) and the driving assembly (3), and the salvage main body (4) is connected with the driving assembly (3) through the lifting sling (7);
And a third step of: lowering the salvaging main body (4) through the driving assembly (3), and controlling the salvaging main body (4) to rotate through the driving assembly (3) until the outer clamping claw (905) and the inner clamping claw (904) are contacted with each decomposition part of the drill bit (10);
Fourth step: the salvaging main body (4) is continuously lowered through the driving assembly (3), under the action of the self weight of the whole device and the lifting sling (7), the outer clamping claw (905) is outwards expanded to elastically deform, and the clamping hook (906) at the lower end of the outer clamping claw (905) is embedded into a gap between the drill bit (10) and the stratum, so that the decomposed drill bit (10) is clamped;
Fifth step: electrifying an electronic spark plug (907) through a cable, starting to carry out thermit reaction in a welding cavity (9), wherein molten iron is formed in a molten state in the thermit reaction process, and fills the molten iron into the welding cavity (9) and into a sealed space of a rock layer at the upper end, the side surface and the bottom of a drill bit (10), and because the rock is a hot poor conductor, the molten iron in the molten state fills into a gap between the drill bit (10) and the rock layer, and after the molten iron is cooled, the whole device and the decomposed drill bit (10) are welded into a firmly-bonded permanent joint; on the other hand, a large amount of heat is released in the aluminothermic reaction process, so that rocks outside the drill bit (10) and rock scraps inside the drill bit (10) start to melt and break, and rock strata of the stratum where the drill bit (10) is positioned start to loosen, so that the decomposed drill bit (10) loosens in the rock strata, and the decomposed drill bit (10) is conveniently pulled out;
sixth step: the driving assembly (3) ascends integrally through the lifting sling (7) control device, and as the integral device and the decomposed drill bit (10) form a permanent joint which is firmly bonded, the decomposed drill bit (10) can be directly fished out of the geothermal well (1); after the well is fished out, the welding cavity (9) is detached from the lifting boss (8).
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