CN107060679B

CN107060679B - Screw rod hydraulic pressure can move back formula fishing tool

Info

Publication number: CN107060679B
Application number: CN201710273669.1A
Authority: CN
Inventors: 梁政; 邓严; 邓兰; 刘稳; 谢帅
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2017-04-25
Filing date: 2017-04-25
Publication date: 2023-04-21
Anticipated expiration: 2037-04-25
Also published as: CN107060679A

Abstract

The invention relates to the technical field of oil and natural gas salvage, in particular to a tool for salvaging the deformation of a fish head of a drilling tool. The technical proposal is as follows: the flow dividing disc is provided with two flow dividing channels and a central flow channel; the blocking sieve is fixedly arranged on the central flow passage of the flow distribution disc; the rotor is provided with a central flow passage, and the lower end of the rotor is connected with a flexible universal joint; the upper end of the upper sleeve is connected with the flexible universal joint, and the lower end of the upper sleeve is arranged on the bearing group; the outer end of the positioning sleeve is connected with the cylinder wall through threads; the center spear is provided with a center runner, the upper end of the center spear is provided with a spline, the lower end of the center spear is provided with a conical step, and two sub runners are arranged; the safety pins are in a stepped shaft shape; the slips are in an arc shape with four petals; the columnar grinding shoes are provided with annular flow passages, the upper ends of the columnar grinding shoes are connected with the central spear through threads, and the lower ends of the columnar grinding shoes are conical. The invention can not only unclamp and salvage the fish with serious sand deposit, but also salvage the fish head with complex deformation in a retractable way, thereby improving the salvage success rate and reducing the accident loss.

Description

Screw rod hydraulic pressure can move back formula fishing tool

Technical Field

The invention relates to the technical field of oil and natural gas salvage, in particular to a tool for salvaging the deformation of a fish head of a drilling tool.

Background

The drilling tool bears complex stress such as stretching, compressing, bending, twisting and cutting in long-term working, frequent alternating stress can be generated in certain areas, the drilling tool is extremely easy to generate fatigue damage and fall into the bottom of a well, and meanwhile, the fish head of the fish is corroded and deformed due to the complex and severe environment of the bottom of the well; meanwhile, the drill string is jumped due to brake failure, well head tool failure and the like, so that the drill is broken, and the fish head of the fish is easy to deform; therefore, the conventional fishing tool is difficult to cope with the fishing accident of complex deformation of the fish head of the fish. On the other hand, the sand settling phenomenon of the whole well section is particularly serious due to the well completion operation of the horizontal well with a high inclination, and the fishing operation of the fish is extremely difficult. In the aspect of salvaging equipment, the traditional wellhead power equipment cannot transfer torque and pulling force to the position of the large-inclination well section fish to the maximum extent, and the friction force between the pipe column and the casing consumes a great part of power, so that the unfreezing measure by using the conventional vertical well salvaging tool is basically difficult to realize.

Based on the technical background, the invention provides a screw hydraulic retractable fishing tool, which is used for the fishing tool with complex fish heads corroded and deformed.

Disclosure of Invention

The invention aims at: in order to meet the technical requirement that a fishing tool can safely withdraw when the fishing fails, the screw hydraulic retractable fishing tool is particularly provided.

In order to achieve the above purpose, the present invention adopts the following technical scheme: the utility model provides a screw rod hydraulic pressure retractable fishing tool, is by top connection, shutoff sieve, flow distribution plate, rotor, stator, flexible universal joint, positioning sleeve, go up sleeve, bearing group, promote piston, safe pin, center spear, spring, lower sleeve, slips, column shoe, wall hook, shutoff ball and section of thick bamboo wall and constitutes its characterized in that: the flow dividing disc is cylindrical, two flow dividing channels and a central flow channel are formed, and the flow dividing disc is connected with the upper joint through threads; the upper joint is provided with an anti-drop step, the lower end of the upper joint is connected with the cylinder wall, and the plugging screen is fixedly arranged in the central flow passage of the flow distribution disc; the stator is fixedly arranged on the cylinder wall; the rotor is provided with a central flow passage, the upper end of the rotor is arranged on the upper joint drop-proof step, and the lower end of the rotor is connected with the flexible universal joint; the bearing group is arranged on the middle step of the cylinder wall; the upper end of the upper sleeve is connected with the flexible universal joint, the lower end of the upper sleeve is arranged on the bearing group, the upper end of the upper sleeve is provided with two flow passages, the lower port of the upper sleeve is provided with spline grooves, the middle part of the upper sleeve is symmetrically provided with a hydraulic flow passage, and the lower part of the upper sleeve hydraulic flow passage is symmetrically provided with a piston passage and a safety pin hole; the outer end of the positioning sleeve is connected with the cylinder wall through threads, the lower end of the positioning sleeve is provided with a conical step, and the positioning sleeve is arranged on the conical outer end surface of the upper sleeve; the pushing piston is arranged in the upper sleeve piston channel; the center spear is provided with a center runner, the upper end of the center spear is provided with a spline, the center spear spline is arranged in the spline groove of the upper sleeve, the upper end of the center spear is provided with a safety pin hole, and the lower end of the center spear is provided with a conical step and two sub runners; the safety pins are in a stepped shaft shape, the large-diameter section is arranged in a safety pin hole of the central spear, and the small-diameter end is arranged in the safety pin hole of the upper sleeve; the upper end of the lower sleeve is connected with the upper sleeve through threads, and the lower end of the lower sleeve is provided with a groove; the four slips are in an arc shape, the upper ends of the slips are connected with springs and are installed in the grooves of the lower sleeve, slip teeth are arranged at the lower ends of the slips, and the slips are installed on the conical steps of the central spear; the columnar grinding shoes are provided with annular flow passages, the upper ends of the columnar grinding shoes are connected with the central spear through threads, the lower ends of the columnar grinding shoes are in a columnar cone shape, and grinding teeth are arranged in the middle of the columnar grinding shoes; the wall hook is connected with the cylinder wall through threads.

The invention has the beneficial effects that: (1) The screw rod is adopted to provide power for the column-shaped grinding shoes, so that the problem of insufficient underground power can be effectively solved; (2) The invention has a plurality of sand flushing and circulating sand discharging flow channels, can perform circulating sand flushing on the inner cavity and the outer cavity of the fish, and realizes the fish salvaging of the heavy sand sinking pipe section of the highly-inclined well (3) the invention can perform sand flushing, shaping, milling functions on the fish head, and can salvage the complex drilling tool with deformed fish head; (4) When the fishing is failed, the fishing tool can be withdrawn from the inner cavity of the fish through simple operation.

Drawings

FIG. 1 is a schematic view of a screw hydraulic retractable fishing tool of the present invention;

FIG. 2 is a schematic view of a safety exit structure of a screw hydraulic retractable fishing tool according to the present invention;

FIG. 3 is an enlarged view of a screw hydraulic retractable fishing tool B;

FIG. 4 is an A-A view of an inventive screw hydraulic retractable fishing tool;

in the figure, the upper joint is shown as 1, the plugging screen is shown as 2, the diverter disc is shown as 3, the rotor is shown as 4, the stator is shown as 5, the flexible universal joint is shown as 6, the positioning sleeve is shown as 7, the upper sleeve is shown as 8, the bearing group is shown as 9, the pushing piston is shown as 10, the safety pin is shown as 11, the center spear is shown as 13, the spring is shown as 14, the lower sleeve is shown as 15, the slip is shown as 16, the cylindrical grinding shoe is shown as 17, the wall hook is shown as 18, the plugging ball is shown as 19, and the cylinder wall is shown as 19.

Detailed Description

As shown in fig. 1, 2, 3 and 4, the screw hydraulic retractable fishing tool of the present invention is composed of an upper joint 1, a plugging screen 2, a diverter disc 3, a rotor 4, a stator 5, a flexible universal joint 6, a positioning sleeve 7, an upper sleeve 8, a bearing group 9, a pushing piston 10, a safety pin 11, a center spear 12, a spring 13, a lower sleeve 14, slips 15, a column mill shoe 16, a wall hook 17, a plugging ball 18 and a cylinder wall 19, and is characterized in that: the diverter disc 3 is cylindrical, two diversion channels and a central flow channel are formed, the diversion channels mainly are drilling fluid driving screw rods to rotate, the central flow channel mainly uses high-pressure drilling fluid to realize retreating, and the diverter disc 3 is connected with the upper joint 1 through threads; the upper joint 1 is provided with an anti-drop step, and the lower end of the upper joint 1 is connected with the cylinder wall 19 through threads; the blocking sieve 2 is fixedly arranged on the central flow passage of the flow distribution disc 3, and the blocking sieve 2 mainly enables drilling fluid to pass through the screw rod to prevent the drilling fluid from passing through the central flow passage; the stator 5 is fixedly arranged on the cylinder wall 19; the rotor 4 is provided with a central flow passage, the upper end of the rotor 4 is arranged on the anti-falling step of the upper joint 1, the rotor 4 is prevented from falling, the lower end of the rotor is connected with the flexible universal joint 6, and the flexible universal joint 6 realizes torque transmission; the bearing group 9 is arranged on the middle step of the cylinder wall 19, and the bearing group 9 ensures the rotation of the drilling tool and balances the axial force; the upper end of the upper sleeve 8 is connected with the flexible universal joint 6, the lower end of the upper sleeve is arranged on the bearing group 9, the upper end of the upper sleeve 8 is provided with two flow passages, the lower port of the upper sleeve is provided with spline grooves, the middle part of the upper sleeve 8 is symmetrically provided with a hydraulic flow passage, the lower part of the hydraulic flow passage of the upper sleeve 8 is symmetrically provided with a piston passage and a safety pin hole, and the piston and the safety pin ensure the safety and the retractability of a tool; the outer end of the positioning sleeve 7 is connected with the cylinder wall 19 through threads, a conical step is arranged at the lower end of the positioning sleeve, the positioning sleeve 7 is arranged on the conical outer end surface of the upper sleeve 8, and the positioning sleeve 7 prevents the upper sleeve 8 from moving axially; a pushing piston 10 is arranged in the piston channel of the upper sleeve 8; the center spear 12 is provided with a center runner, the upper end of the center spear is provided with a spline, the center spear spline is arranged in the spline groove of the upper sleeve 8, the spline is matched with the spline groove of the upper sleeve 8, torque transmission is realized, the safety retractability of the center spear is ensured, the upper end of the center spear 12 is provided with a safety dowel hole, and the lower end of the center spear is provided with a conical step and two sub runners; the safety pins 11 are in a stepped shaft shape, the large-diameter section is arranged in the safety pin hole of the central spear 12, and the small-diameter end is arranged in the safety pin hole of the upper sleeve 8; the upper end of the lower sleeve 14 is connected with the upper sleeve 8 through threads, and the lower end is provided with a groove; the slips 15 are in an arc shape, the upper ends of the slips 15 are connected with the springs 13 and are installed in grooves of the lower sleeve 14, slip teeth are arranged at the lower ends of the slips 15, the slip teeth are inserted into a cavity of a fish to finish fish fishing, and the slips are installed on conical steps of the central spear 12; the columnar grinding shoes 16 are provided with annular flow passages, sediment in the inner cavity of the fish can be circulated through the annular flow passages, the upper ends of the annular flow passages are connected with the central spear 12 through threads, the lower ends of the annular flow passages are conical, the shaping of the deformed fish heads is realized, grinding and milling teeth are arranged in the middle of the columnar grinding shoes 16, and the cleaning of burrs and corrosive scrap iron of the fish heads is realized; the wall hook 17 is screwed with the cylinder wall 19.

The working principle of the invention is as follows: the method comprises the steps of sending the fish head to a fish head of a fish, if the fish head is buried by sand, pumping and circulating drilling fluid until the fish head is exposed, driving a rotor 4 to rotate around a stator 5 through two sub-runners of a flow distribution disc 3, driving an upper sleeve 8 to rotate through a flexible universal joint 6 by the stator 4, and driving a center spear 12 to rotate through a spline by the upper sleeve 8; lowering a drill string, righting a fish close to a well wall by a rotary wall hook 17, trimming deformed fish heads by a conical department of a cylindrical mill shoe 16, cleaning burrs, scrap iron and sundries of the fish heads by milling teeth of the cylindrical mill shoe 16, ensuring that the fish heads of the fish heads are aligned completely, continuing to drill the lower drill string, enabling slips 15 to enter the inner cavity of the fish head, flushing most of sand settling of a well annulus and the inner cavity of the fish head by drilling fluid, and reducing the weight and the unclamping force of the fish; lifting the drill string, the slip teeth of the slips 15 bite into the inner cavity of the fish, and continuing to lift the drill string until the fish is fished out.

Safe and retractable working principle: if the fishing is unsuccessful or the square fish needs to be released under special conditions, the plugging balls 18 are put into, high-pressure drilling fluid is introduced, the plugging balls 18 enter the plugging screen 2 fixed on the flow distribution disc 3 through the upper joint 1 and are continuously pressed, the plugging balls 18 push the plugging screen 2 until the plugging screen 2 slips off, the plugging screen 2 finally slips to a grinding shoe port to be retracted, the plugging balls 18 move to the ball seat of the central spear 12 to be continuously pressed under the pushing of the high-pressure drilling fluid, the high-pressure drilling fluid pushes the piston (10) to descend through the hydraulic flow passage of the upper sleeve (8) so as to cut the safety pin 11, push the central spear 12 to descend, the conical surface at the lower end of the central spear 12 is separated from the slips 5, the slips 5 lose supporting force, the plugging screen 2 is automatically retracted under the action of the spring 13, the drill string is lifted up, and the fishing tool is safely withdrawn.

Claims

1. The utility model provides a screw rod hydraulic pressure retractable fishing tool, by top connection (1), shutoff sieve (2), flow distribution plate (3), rotor (4), stator (5), flexible universal joint (6), positioning sleeve (7), go up sleeve (8), bearing group (9), promote piston (10), safe pin (11), center spear (12), spring (13), lower sleeve (14), slips (15), columnar mill shoes (16), wall hook (17), shutoff ball (18) and section of thick bamboo wall (19) constitute, its characterized in that: the flow distribution disc (3) is cylindrical, two flow distribution channels and a central flow channel are formed, and the flow distribution disc (3) is connected with the upper joint (1) through threads; the upper joint (1) is provided with an anti-falling step, the lower end of the upper joint (1) is connected with the cylinder wall (19), and the plugging screen (2) is fixedly arranged in the central flow passage of the flow distribution disc (3); the stator (5) is fixedly arranged on the cylinder wall (19); the rotor (4) is provided with a central flow passage, the upper end of the rotor (4) is arranged on the anti-falling step of the upper joint (1), and the lower end of the rotor is connected with the flexible universal joint (6); the bearing group (9) is arranged on the middle step of the cylinder wall (19); the upper end of the upper sleeve (8) is connected with the flexible universal joint (6), the lower end of the upper sleeve is arranged on the bearing group (9), two flow passages are formed in the upper end of the upper sleeve (8), spline grooves are formed in the lower port of the upper sleeve, hydraulic flow passages are symmetrically formed in the middle of the upper sleeve (8), and piston passages and safety pin holes are symmetrically formed below the hydraulic flow passages of the upper sleeve (8); the outer end of the positioning sleeve (7) is connected with the cylinder wall (19) through threads, the lower end of the positioning sleeve is provided with a conical step, and the positioning sleeve (7) is arranged on the conical outer end surface of the upper sleeve (8); the pushing piston (10) is arranged in the piston channel of the upper sleeve (8); the center spear (12) is provided with a center runner, the upper end of the center spear is provided with a spline, the center spear spline is arranged in the spline groove of the upper sleeve (8), the upper end of the center spear (12) is provided with a safety dowel hole, and the lower end of the center spear is provided with a conical step and two sub runners; the safety pins (11) are in a stepped shaft shape, the large-diameter section is arranged in a safety pin hole of the center spear (12), and the small-diameter end is arranged in the safety pin hole of the upper sleeve (8); the upper end of the lower sleeve (14) is connected with the upper sleeve (8) through threads, and the lower end is provided with a groove; the slips (15) are in an arc shape, the upper ends of the slips (15) are connected with the springs (13) and are installed in grooves of the lower sleeve (14), slip teeth are arranged at the lower ends of the slips (15), and the slips are installed on conical steps of the central spear (12); the columnar grinding shoes (16) are provided with annular flow passages, the upper ends of the columnar grinding shoes are connected with the central spear (12) through threads, the lower ends of the columnar grinding shoes are in a columnar cone shape, and grinding teeth are arranged in the middle of the columnar grinding shoes (16); the wall hook (17) is connected with the cylinder wall (19) through threads.