CN114562228B - Drilling accident handling device for improving well integrity - Google Patents
Drilling accident handling device for improving well integrity Download PDFInfo
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- CN114562228B CN114562228B CN202210220959.0A CN202210220959A CN114562228B CN 114562228 B CN114562228 B CN 114562228B CN 202210220959 A CN202210220959 A CN 202210220959A CN 114562228 B CN114562228 B CN 114562228B
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- 238000005553 drilling Methods 0.000 title claims abstract description 21
- 241000251468 Actinopterygii Species 0.000 claims abstract description 51
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 239000002002 slurry Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 238000013459 approach Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Classifications
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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
- E21B31/20—Grappling tools, e.g. tongs or grabs gripping internally, e.g. fishing spears
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a drilling accident handling device for improving the integrity of a well, which comprises a joint, a flat key, a pressing piston, a positioning pin, a sliding sleeve, a shell, a blocking wire, a slip, a mandrel, a ball, a reset spring, a pin spring, a sealing ring and a travel pin, wherein when a fish accident occurs in the well, the mandrel enters the fish, slip teeth are contacted with the inner wall of the fish, an axial groove arranged at the lower end of the slip enables the slip teeth to have elasticity and bite the inner wall of the fish, at the moment, a pipe column is lifted up, the joint and the mandrel move upwards along with the pipe column, the slip is restrained by the fish and moves downwards relative to the mandrel, and an inclined conical surface acts on the trumpet-shaped inner wall at the lower end of the slip, so that the outer diameter of the slip teeth is enlarged, the biting force between the slip teeth and the fish is increased, and the fish is lifted up along with the pipe column and taken out from the well; when the accident processing device bites down the fish, but the fish is blocked too tightly to lift up, the pipe column is lowered, the joint and the mandrel move slightly downwards along with the pipe column, the shell and the slips move upwards relative to the mandrel, and the slip teeth shrink and are separated from the fish.
Description
Technical Field
The invention relates to an underground device, in particular to a drilling accident handling device for improving the integrity of a well, and belongs to the technical field of mechanical engineering or drilling engineering.
Background
In drilling and well completion and downhole operations, normal drilling, well repair and well completion operations are interrupted due to the reasons that a drill rod, a drill collar, a sleeve, a tubing string are clamped or broken, a drill bit cone falls off, a logging instrument or a cable is clamped, a cable steel wire rope is broken, a packer is clamped, sand setting, serious well leakage, well collapse, well blowout and the like, and a fishing tool is needed or special measures are taken to remove the leakage, collapse, clamping and blowout so as to restore the normal operations. According to domestic past statistics, four wells may need to be salvaged for each repair of five wells, so that it is necessary to prepare a common salvaging tool and to know and grasp the common salvaging technology.
The tool used for fishing is various, such as a retractable overshot, a three-ball fishing device, a retractable fishing spear, a sleeve fishing spear, a strong magnetic fishing device, a reverse circulation strong magnetic fishing device, a fishing cup, a reverse circulation strong magnetic fishing basket and the like. The current mainstream fishing tool in China is a retractable slip fishing spear, and when the fishing tool is used for fishing, if the fish cannot be safely taken out, the fishing spear can be retracted, so that secondary underground accidents are prevented. But many salvage slips of salvaging spears are little with the inner wall area of the fish, and radial expansion force is concentrated, and the easy spalling fish loses the salvage effect to adopt the mode of rotatory drilling string to realize the operation that the fish is clenched and is taken off, difficult operation just damages the instrument easily, so design a convenient operation, simple structure, safe and reliable's salvage instrument has important meaning.
Disclosure of Invention
The invention aims at: the drilling accident handling device is used for fishing down-hole fish, and can be withdrawn from the fishing device when the fish cannot be safely taken out.
The technical scheme adopted by the invention is as follows:
a drilling accident handling device for improving the integrity of a well comprises a joint, a pressing piston, a shell, slips and a mandrel; the joint comprises a pipe column connecting buckle, a joint key slot, a supporting step, a joint pin hole, a lower end buckle and a travel pin mounting hole; the pressing piston comprises a sealing ring groove, a travel pin groove, a positioning pin groove and a control hook; the shell comprises a shell key groove, a shell pin hole, a shell step, a shell ball groove and a ball mounting hole; the slips comprise slip ball grooves, slip teeth and axial grooves; the mandrel comprises a control groove, a mandrel connecting buckle and an inclined conical surface; the pipe column connecting buckle of the connector is connected with the pipe column at the upper end of the accident handling device, and the lower end buckle of the connector is connected with the mandrel connecting buckle of the mandrel through threads; positioning pins are arranged in the joint pin holes and the positioning pin grooves, and pin springs are arranged between the steps of the positioning pins and the supporting steps; and flat keys are arranged in the joint key groove and the shell key groove and are used for limiting the relative rotation between the joint and the shell, and meanwhile, the alignment of the shell pin holes and the joint pin holes is ensured.
Further, the shell is connected with the slips through balls, the balls are plugged into the shell ball grooves and the slip ball grooves through ball mounting holes, and the blocking wires are arranged in the ball mounting holes through threads and used for preventing the balls from falling off; the shell step is provided with a sliding sleeve to prevent mud and sand from entering the pin hole of the shell.
Further, an axial groove is formed in the lower end of the slip, so that the lower end of the slip is cut into multiple-flap slip teeth; the inner wall of the lower end of the slip is in a horn shape and is matched with the inclined conical surface of the mandrel.
Further, a reset spring is arranged between the pressing piston and the mandrel.
Further, a sealing ring is arranged in a sealing ring groove between the inner wall of the joint and the outer wall of the pressing piston.
Further, one end of the travel pin is installed in the travel pin installation hole, the other end of the travel pin is inserted into the travel pin groove, and the travel pin groove is in a strip shape.
Further, the control hook comprises a control hook main rod, a control hook auxiliary rod and a control head, wherein the control hook main rod and the control hook auxiliary rod are in a V shape, and the control head is arranged at the end part of the control hook auxiliary rod; one end of the control hook main rod is fixed on the pressing piston, and the control hook is positioned in the control groove during working.
Further, the control groove comprises a control groove bottom surface, a control groove side surface, a limit groove, a limit boss and a control groove inclined surface.
Further, when the slurry pump is started, fluid in the drill string drives the pressing piston to move downwards, the positioning pin is extruded out of the positioning pin groove, the positioning pin compresses the pin spring and enters the pin hole of the shell, the reset spring is pressed, the control head falls into the limiting groove along the inclined plane of the control groove beyond the limiting boss, the end face of the control head is restrained by the step face of the limiting boss so as to limit the pressing piston to move upwards, and in the process, the slip and the mandrel cannot move relatively due to the limitation of the positioning pin on the pin hole of the joint and the pin hole of the shell; when the slurry pump is closed and then opened again, the control head slides out of the limit groove along the inclined plane of the limit groove, the control hook auxiliary rod approaches the control hook main rod, namely, the V-shaped opening between the control hook main rod and the control hook auxiliary rod is smaller, the piston is pressed to move upwards under the driving of the reset spring after slurry stably flows, the control head slides along the side surface of the control groove towards the inclined plane of the control groove, when the control head slides over the limit boss, the control head moves to the space beside the inclined plane of the control groove under the action of the elasticity of the control hook, namely, the V-shaped opening between the control hook main rod and the control hook auxiliary rod is larger, and the positioning pin reenters the positioning pin groove under the action of the pin spring in the process.
Further, when a fish accident occurs in the oil-gas well shaft, the accident handling device is put into the well, the mandrel firstly enters the fish, the slip teeth are contacted with the inner wall of the fish under the guiding action of the mandrel, the axial grooves arranged at the lower ends of the slips enable the slip teeth to have elasticity and bite the inner wall of the fish, at the moment, the pipe column is lifted up, the joint and the mandrel move upwards along with the pipe column, the slips are restrained by the fish and move downwards relative to the mandrel, the inclined conical surface acts on the trumpet-shaped inner wall at the lower end of the slips, so that the outer diameter of the slip teeth is enlarged, the biting force between the slip teeth and the fish is increased, and the fish is lifted up along with the pipe column and taken out from the well; when the accident processing device bites down the fish, but the fish is blocked too tightly to lift up, the pipe column is lowered, the joint and the mandrel move slightly downwards along with the pipe column, the shell and the slips move upwards relative to the mandrel, the slip teeth shrink and separate from the fish, the slurry pump is started, the slurry is pressed down to press the piston, the positioning pin compresses the pin spring and enters the pin hole of the shell, the joint and the shell cannot move relatively, at the moment, the control head falls into the limiting groove along the inclined plane of the control groove beyond the limiting boss, the end face of the control head is restrained by the step surface of the limiting boss so as to limit the upward movement of the pressing piston, the stroke of the pressing piston can be limited by Cheng Xiaoding in the process, and the pipe column is lifted up in the state so as to prevent the fish from clamping the accident processing device.
Compared with the prior art, the invention has the following beneficial effects: (1) The contact area between the slips and the inner wall of the fish is large, which is helpful for protecting the fish; (2) When the fish cannot be safely taken out, the fishing device can also be withdrawn.
Drawings
FIG. 1 is a schematic illustration of a full section of a well accident management apparatus for improving well integrity in accordance with the present invention;
FIG. 2 is a schematic illustration of another full section of a drilling event handling apparatus for improving well integrity in accordance with the present invention;
FIG. 3 is a schematic three-dimensional view of a well accident management system for improving well integrity according to the present invention;
FIG. 4 is a schematic cross-sectional view of A-A in FIG. 1;
FIG. 5 is a schematic view in cross-section B-B of FIG. 1;
FIG. 6 is a schematic illustration of the construction of a joint of a drilling event handling device for improving well integrity in accordance with the present invention;
FIG. 7 is a schematic illustration of the structure of a pressing piston of a well accident handling apparatus for improving well integrity in accordance with the present invention;
FIG. 8 is another schematic illustration of a press piston of a well accident handling apparatus for improving well integrity in accordance with the present invention;
FIG. 9 is another schematic illustration of a press piston of a well accident handling apparatus for improving well integrity in accordance with the present invention;
FIG. 10 is another schematic illustration of a press piston of a well accident handling apparatus for improving well integrity in accordance with the present invention;
FIG. 11 is a schematic three-dimensional view of a control hook on a pressure piston of a well accident handling apparatus for improving well integrity in accordance with the present invention;
FIG. 12 is a schematic illustration of the structure of the housing of a well accident management system for improving the integrity of a well in accordance with the present invention;
FIG. 13 is a schematic illustration of the construction of a slip of a drilling event handling device for improving the integrity of a well in accordance with the present invention;
FIG. 14 is a schematic illustration of the mandrel of a well accident handling apparatus for improving well integrity in accordance with the present invention;
FIG. 15 is another schematic illustration of the mandrel of a well accident management apparatus for improving the integrity of a well in accordance with the present invention;
FIG. 16 is a schematic view of the structure of the part I in FIG. 15;
FIG. 17 is a schematic illustration of a configuration of a press piston of a well accident handling apparatus for improving well integrity in accordance with the present invention mated with a mandrel;
FIG. 18 is a schematic illustration of another configuration of a press piston of a well accident handling apparatus for improving well integrity in accordance with the present invention in combination with a mandrel;
FIG. 19 is a schematic view of a well accident handling apparatus for improving well integrity of the present invention after the plunger has moved down and compressed the return spring;
in the figure: 1. the joint, 1a, the pipe column connecting buckle, 1b, the joint key groove, 1c, the supporting step, 1d, the joint pin hole, 1e, the lower end buckle, 1f, the travel pin mounting hole, 2, the flat key, 3, the pressing piston, 3a, the seal ring groove, 3b, the travel pin groove, 3c, the locating pin groove, 3d, the control hook, 3m, the control hook main rod, 3n, the control hook auxiliary rod, 3s, the control head, 4, the locating pin, 5, the sliding sleeve, 6, the shell, 6a, the shell key groove, 6b, 6c, housing step, 6d, housing ball groove, 6e, ball mounting hole, 7, plug, 8, slip, 8a, slip ball groove, 8b, slip tooth, 8c, axial groove, 9, mandrel, 9a, control groove, 9b, mandrel adapter, 9c, beveled, 9k, control groove floor, 9m, limit groove, 9n, control groove bevel, 9r, limit boss, 9s, control groove side, 10, ball, 11, return spring, 12, pin spring, 13, seal ring, 14, travel pin.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Examples:
as shown in fig. 1-19, the present embodiment relates to a drilling accident handling device for improving the integrity of a well, comprising a joint 1, a pressing piston 3, a housing 6, slips 8 and a mandrel 9; the joint 1 comprises a pipe column connecting buckle 1a, a joint key groove 1b, a supporting step 1c, a joint pin hole 1d, a lower end buckle 1e and a travel pin mounting hole 1f; the pressing piston 3 comprises a sealing ring groove 3a, a travel pin groove 3b, a positioning pin groove 3c and a control hook 3d; the housing 6 includes a housing key groove 6a, a housing pin hole 6b, a housing step 6c, a housing ball groove 6d, and a ball mounting hole 6e; the slips 8 include slip ball grooves 8a, slip teeth 8b, and axial grooves 8c; the mandrel 9 comprises a control groove 9a, a mandrel connecting buckle 9b and an inclined conical surface 9c; the pipe column connecting buckle 1a of the connector 1 is connected with the pipe column at the upper end of the accident handling device, and the lower end buckle 1e of the connector 1 is connected with the mandrel connecting buckle 9b of the mandrel 9 through threads; a positioning pin 4 is arranged in the joint pin hole 1d and the positioning pin groove 3c, and a pin spring 12 is arranged between the step of the positioning pin 4 and the supporting step 1 c; the connector keyway 1b and the housing keyway 6a are provided with a flat key 2 for limiting relative rotation between the connector 1 and the housing 6 while ensuring alignment of the housing pin holes 6b with the connector pin holes 1d.
The shell 6 is connected with the slips 8 through balls 10, the balls 10 are plugged into the shell ball grooves 6d and the slips ball grooves 8a through ball mounting holes 6e, and the plugs 7 are mounted in the ball mounting holes 6e through threads and used for preventing the balls 10 from falling off; the shell step 6c is provided with a sliding sleeve 5 to prevent mud and sand from entering the shell pin hole 6b.
The lower end of the slip 8 is provided with an axial groove 8c so as to cut the lower end of the slip 8 into multi-petal slip teeth 8b; the inner wall of the lower end of the slip 8 is in a horn shape and is matched with an inclined conical surface 9c of the mandrel 9.
A return spring 11 is arranged between the pressing piston 3 and the mandrel 9.
A sealing ring 13 is arranged in a sealing ring groove 3a between the inner wall of the joint 1 and the outer wall of the pressing piston 3.
One end of the travel pin 14 is mounted in the travel pin mounting hole 1f, and the other end is inserted into the travel pin groove 3b, and the travel pin groove 3b is elongated.
The control hook 3d comprises a control hook main rod 3m, a control hook auxiliary rod 3n and a control head 3s, wherein the control hook main rod 3m and the control hook auxiliary rod 3n are in a V shape, and the control head 3s is arranged at the end part of the control hook auxiliary rod 3 n; one end of the control hook main rod 3m is fixed on the pressing piston 3, and the control hook 3d is positioned in the control groove 9a during operation.
The control groove 9a comprises a control groove bottom surface 9k, a control groove side surface 9s, a limit groove 9m, a limit boss 9r and a control groove inclined surface 9n.
In this embodiment, when the slurry pump is started, the fluid in the drill string drives the pressing piston 3 to move downwards, the positioning pin 4 is extruded out of the positioning pin groove 3c, the positioning pin 4 compresses the pin spring 12 and enters the housing pin hole 6b, the return spring 11 is pressed, the control head 3s falls into the limit groove 9m along the control groove inclined plane 9n beyond the limit boss 9r, the end face of the control head 3s is restrained by the step face of the limit boss 9r so as to limit the pressing piston 3 to move upwards, and in the process, the slip 8 and the mandrel 9 cannot move relatively due to the limitation of the positioning pin 4 on the joint pin hole 1d and the housing pin hole 6 b; when the slurry pump is turned off and then turned on again, the control head 3s slides out of the limit groove 9m along the inclined plane of the limit groove 9m, the control hook auxiliary rod 3n approaches the control hook main rod 3m, namely, the V-shaped opening between the control hook main rod 3m and the control hook auxiliary rod 3n is smaller, after the slurry stably flows, the piston 3 is pressed to move upwards under the driving of the reset spring 11, the control head 3s slides along the side 9s of the control groove to the inclined plane 9n of the control groove, when the control head 3s slides over the limit boss 9r, the V-shaped opening between the control hook main rod 3m and the control hook auxiliary rod 3n is enlarged under the action of the elasticity of the control hook 3d, and in the process, the positioning pin 4 reenters the positioning pin groove 3c under the action of the pin spring 12.
When the embodiment is applied, when a fish accident occurs in an oil-gas well shaft, the accident handling device is put into the well, the mandrel 9 firstly enters the fish, the slip teeth 8b are contacted with the inner wall of the fish under the guiding action of the mandrel 9, the axial grooves 8c arranged at the lower ends of the slips 8 enable the slip teeth 8b to have elasticity and bite the inner wall of the fish, at the moment, the pipe column is lifted, the joint 1 and the mandrel 9 move upwards along with the pipe column, the slips 8 are restrained by the fish and move downwards relative to the mandrel 9, the inclined conical surface 9c acts on the trumpet-shaped inner wall at the lower end of the slips 8, so that the outer diameter of the slip teeth 8b is increased, the biting force between the slips 8b and the fish is increased, and the fish is lifted up along with the pipe column and taken out from the well; when the accident handling device bites down the fish, but the fish is blocked too tightly to lift up, the pipe column is lowered, the joint 1 and the mandrel 9 move slightly downwards along with the pipe column, the shell 6 and the slips 8 move upwards relative to the mandrel 9, the slip teeth 8b shrink and separate from the fish, the slurry pump is started, the slurry is pressed down to press the piston 3, the positioning pin 4 compresses the pin spring 12 and enters the shell pin hole 6b, the joint 1 and the shell 6 cannot move relatively, at the moment, the control head 3s falls into the limit groove 9m along the control groove inclined plane 9n beyond the limit boss 9r, the end face of the control head 3s is restrained by the step face of the limit boss 9r, so that the press piston 3 is limited to move upwards, the stroke pin 14 can limit the stroke of the press piston 3 in the process, and the pipe column is lifted up in this state, so that the accident handling device can be prevented from being blocked by the fish.
The above-described embodiments are intended to illustrate the present invention and not to limit the scope of the invention, and any equivalent changes and modifications made by those skilled in the art will be within the scope of the present system without departing from the spirit and principles of the present invention.
Claims (7)
1. A drilling accident handling device for improving the integrity of a well, which is characterized by comprising a joint (1), a pressing piston (3), a shell (6), slips (8) and a mandrel (9); the joint (1) comprises a pipe column connecting buckle (1 a), a joint key groove (1 b), a supporting step (1 c), a joint pin hole (1 d), a lower end buckle (1 e) and a travel pin mounting hole (1 f); the pressing piston (3) comprises a sealing ring groove (3 a), a travel pin groove (3 b), a positioning pin groove (3 c) and a control hook (3 d); the shell (6) comprises a shell key groove (6 a), a shell pin hole (6 b), a shell step (6 c), a shell ball groove (6 d) and a ball mounting hole (6 e); the slips (8) comprise slip ball grooves (8 a), slip teeth (8 b) and axial grooves (8 c); the mandrel (9) comprises a control groove (9 a), a mandrel connecting buckle (9 b) and an inclined conical surface (9 c); the pipe column connecting buckle (1 a) of the connector (1) is connected with the pipe column at the upper end of the accident handling device, and the lower end buckle (1 e) of the connector (1) is connected with the core shaft connecting buckle (9 b) of the core shaft (9) through threads; a positioning pin (4) is arranged in the joint pin hole (1 d) and the positioning pin groove (3 c), and a pin spring (12) is arranged between the step of the positioning pin (4) and the supporting step (1 c); the connector key groove (1 b) and the housing key groove (6 a) are internally provided with a flat key (2) for limiting the relative rotation between the connector (1) and the housing (6) and simultaneously ensuring that the housing pin hole (6 b) is aligned with the connector pin hole (1 d); the control hook (3 d) comprises a control hook main rod (3 m), a control hook auxiliary rod (3 n) and a control head (3 s), wherein the control hook main rod (3 m) and the control hook auxiliary rod (3 n) are in a V shape, and the control head (3 s) is arranged at the end part of the control hook auxiliary rod (3 n); one end of the control hook main rod (3 m) is fixed on the pressing piston (3), and the control hook (3 d) is positioned in the control groove (9 a) when in operation; the control groove (9 a) comprises a control groove bottom surface (9 k), a control groove side surface (9 s), a limit groove (9 m), a limit boss (9 r) and a control groove inclined surface (9 n); when the slurry pump is started, fluid in the drill string drives the dynamic piston (3) to move downwards, the positioning pin (4) is extruded out of the positioning pin groove (3 c), the positioning pin (4) compresses the pin spring (12) and enters the shell pin hole (6 b), the reset spring (11) is pressed, the control head (3 s) falls into the limit groove (9 m) along the control groove inclined plane (9 n) beyond the limit boss (9 r), the end face of the control head (3 s) is restrained by the step face of the limit boss (9 r) so as to limit the upward movement of the dynamic piston (3), and in the process, the slip (8) and the mandrel (9) cannot move relatively due to the limitation of the positioning pin (4) on the joint pin hole (1 d) and the shell pin hole (6 b); when the slurry pump is turned off and then turned on again, the control head (3 s) slides out of the limit groove (9 m) along the inclined plane of the limit groove (9 m), the control hook auxiliary rod (3 n) is close to the control hook main rod (3 m), namely, a V-shaped opening between the control hook main rod (3 m) and the control hook auxiliary rod (3 n) is smaller, the piston (3) is pressed to move upwards under the driving of the reset spring (11) after slurry stably flows, the control head (3 s) slides along the side surface (9 s) of the control groove to the inclined plane (9 n) of the control groove, when the control head (3 s) slides over the limit boss (9 r), the control head (3 d) moves to a space beside the inclined plane (9 n) of the control groove under the action of elasticity, namely, the V-shaped opening between the control hook main rod (3 m) and the control hook auxiliary rod (3 n) is larger, and in the process, the positioning pin (4) reenters the positioning pin groove (3 c) under the action of the pin spring (12).
2. A drilling accident handling apparatus for improving well integrity according to claim 1, wherein the housing (6) is connected to the slips (8) by means of balls (10), the balls (10) are plugged into the housing ball grooves (6 d) and the slip ball grooves (8 a) through ball mounting holes (6 e), and the plugs (7) are threadedly mounted in the ball mounting holes (6 e) for preventing the balls (10) from falling off; a sliding sleeve (5) is arranged on the shell step (6 c) to prevent mud and sand from entering the shell pin hole (6 b).
3. A drilling event handling device for improving well integrity according to claim 1, wherein the lower end of the slips (8) is provided with axial grooves (8 c) to cut the lower end of the slips (8) into multi-lobed slip teeth (8 b); the inner wall of the lower end of the slip (8) is in a horn shape and is matched with an inclined conical surface (9 c) of the mandrel (9).
4. Drilling event handling device for improving the integrity of a well according to claim 1, characterized in that a return spring (11) is arranged between the pressure piston (3) and the mandrel (9).
5. Drilling accident handling device for improving the integrity of a well according to claim 1, characterized in that a sealing ring (13) is arranged in a sealing ring groove (3 a) between the inner wall of the joint (1) and the outer wall of the pressing piston (3).
6. A drilling event handling device for improving well integrity according to claim 1, wherein one end of the travel pin (14) is mounted in the travel pin mounting hole (1 f) and the other end is inserted into the travel pin slot (3 b), and the travel pin slot (3 b) is elongated.
7. A drilling accident handling device for improving the integrity of a well according to claim 1, wherein when a fish accident occurs in an oil-gas well, the accident handling device is put into the well, the mandrel (9) firstly enters the fish, the slip teeth (8 b) are contacted with the inner wall of the fish under the guiding action of the mandrel (9), the axial grooves (8 c) arranged at the lower end of the slip (8) enable the slip teeth (8 b) to have elasticity and bite the inner wall of the fish, the pipe column is lifted, the joint (1) and the mandrel (9) move upwards along with the pipe column, the slip (8) is restrained by the fish and moves downwards relative to the mandrel (9), the inclined conical surface (9 c) acts on the trumpet-shaped inner wall at the lower end of the slip (8), so that the outer diameter of the slip teeth (8 b) is enlarged and the biting force between the slip teeth and the fish is increased, and the fish is lifted along with the pipe column and taken out from the well; when the accident handling device bites down the fish, but the fish is blocked too tightly to lift up, the pipe column is lowered, the joint (1) and the mandrel (9) move slightly downwards along with the pipe column, the shell (6) and the slips (8) move upwards relative to the mandrel (9), the slip teeth (8 b) shrink and separate from the fish, the slurry pump is started, the slurry holding pressure presses the pressing piston (3) downwards, the positioning pin (4) compresses the pin spring (12) and enters the shell pin hole (6 b), the joint (1) and the shell (6) cannot move relatively, at the moment, the control head (3 s) passes through the limiting boss (9 r) along the inclined plane (9 n) of the control groove, the end face of the control head (3 s) is restrained by the step face of the limiting boss (9 r), so that the pressing piston (3) is restrained to move upwards, the stroke pin (14) can limit the stroke of the pressing piston (3), and the accident handling device can be prevented from being blocked by lifting up the pipe column in the state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210220959.0A CN114562228B (en) | 2022-03-08 | 2022-03-08 | Drilling accident handling device for improving well integrity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210220959.0A CN114562228B (en) | 2022-03-08 | 2022-03-08 | Drilling accident handling device for improving well integrity |
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| Publication Number | Publication Date |
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| CN114562228A CN114562228A (en) | 2022-05-31 |
| CN114562228B true CN114562228B (en) | 2023-06-02 |
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| CN109057739A (en) * | 2018-09-11 | 2018-12-21 | 西南石油大学 | A kind of pilot-operated type underground fishing tool |
| CN112975798A (en) * | 2021-03-10 | 2021-06-18 | 机械工业第九设计研究院有限公司 | Clamping mechanism capable of being repeatedly positioned |
| CN113775310A (en) * | 2021-08-30 | 2021-12-10 | 国能神东煤炭集团有限责任公司 | Fishing equipment of carbon dioxide fracturing device |
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| CN114562228A (en) | 2022-05-31 |
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