CN209761375U

CN209761375U - cutting and recycling tool for deep water casing

Info

Publication number: CN209761375U
Application number: CN201920635121.1U
Authority: CN
Inventors: 何宇航; 方永; 侯作富
Original assignee: Yangtze University
Current assignee: Yangtze University
Priority date: 2019-05-06
Filing date: 2019-05-06
Publication date: 2019-12-10
Anticipated expiration: 2029-05-06

Abstract

the utility model relates to a cutting recovery tool for deep water sleeve pipe belongs to oil, natural gas sleeve pipe cutting tool technical field. It is by last casing, lower casing, pivot and cutting member constitute, the casing is installed down to the bottom screw thread of going up the casing, the internal thrust bearing and turbine subassembly movable mounting of lower casing have a pivot, the lower extreme of pivot extends to the lower casing external, the cutting member is installed to the screw thread on the pivot bottom end that extends to the external one end of lower casing, this a cutting recovery tool for deep water sheathed tube has the characteristics that restrain casing vibration and cutting efficiency are higher, the cutting inefficiency that has solved current cutting recovery tool existence, and once transfer can only carry out the problem of once cutting and retrieving, the needs of oil abandoning well operation have been satisfied.

Description

cutting and recycling tool for deep water casing

Technical Field

The utility model relates to a cutting recovery tool for deep water sleeve pipe belongs to oil, natural gas sleeve pipe cutting tool technical field.

Background

The exploitation of offshore oil has been continued for decades, and some depleted oil wells with lost value need to be subjected to well abandoning operation, which needs to cut and recover an oil casing pipe so as to recover the waste well head within 5 meters below a seabed mud line.

The traditional cutting and recycling tool usually performs cutting directly, and when a cutter rotates at a high speed to cut the sleeve, the cutter can drive the sleeve to vibrate violently, so that the cutting effect is influenced; in addition, traditional cutting recovery tool is transferred at every turn and can only be cut once and retrieve work, nevertheless because seabed operating mode is complicated, it is very consuming time to put cutting recovery tool to the cutting position from drilling platform down, and the cost is also higher, and low efficiency traditional cutting recovery tool is difficult to satisfy the user demand, consequently needs a new cutting recovery tool to solve foretell not enough.

Disclosure of Invention

The utility model aims to provide a: the cutting and recycling tool for the deepwater casing pipe can effectively solve the problems that the existing tool is low in cutting efficiency and can only cut and recycle once after being placed at one time.

The technical scheme of the utility model is that:

The utility model provides a cutting recovery instrument for deep water sheathed tube, it comprises last casing, lower casing, pivot and cutting member, goes up the bottom screw thread of casing and installs down the casing, and internal thrust bearing and turbine subassembly movable mounting have the pivot through the inferior valve, and the lower extreme of pivot extends to the inferior valve external, and the cutting member is installed to the screw thread on extending to the pivot bottom end of the external one end of inferior valve, its characterized in that: the ball seat is fixedly installed in the top port of the upper shell through the shearing pin, the upper shell below the ball seat is symmetrically provided with upper liquid flow holes, the upper shell below the upper liquid flow holes is symmetrically provided with lower liquid flow holes, the circumference of the upper shell corresponding to the upper liquid flow holes is movably sleeved with an assembly pipe, the assembly pipe is symmetrically provided with flow guide holes, an upper clamping jaw is installed in each flow guide hole through an upper limiting block, and a lower clamping jaw is installed on the upper shell corresponding to the lower liquid flow holes through a lower limiting block.

The upper clamping jaw and the lower clamping jaw are connected with the upper shell through shear pins respectively, the upper clamping jaw and the lower clamping jaw are h-shaped respectively, and anti-skidding teeth are uniformly distributed on the outer end faces of the upper clamping jaw and the lower clamping jaw respectively.

The upper limiting block is connected with the assembling pipe through a fastening bolt, the upper limiting block is connected with the upper clamping jaw in a sliding mode, the lower limiting block is connected with the upper shell through the fastening bolt, and the lower limiting block is connected with the lower clamping jaw in a sliding mode.

And a lifting ring is arranged at the top of the upper limiting block.

the upper shell is a variable-diameter cylindrical body, positioning holes are symmetrically formed in the upper shell between the upper liquid flow hole and the lower liquid flow hole, and the assembling pipe is movably mounted on the upper shell through the positioning holes; and a stepped shell limiting table is arranged on the upper shell at the bottom of the lower liquid flow hole and is annularly arranged.

The assembly pipe is a variable-diameter cylindrical body, a limiting flange is arranged on the assembly pipe below the flow guide hole, and a stepped assembly pipe limiting table is arranged on the upper surface of the limiting flange; the assembling pipe limiting tables are annularly arranged; the lower surface of the limiting flange is provided with a positioning inserted rod corresponding to the positioning hole.

The circumference of the top of the lower shell is provided with external threads, the lower shell below the thrust bearing is symmetrically provided with pressure relief holes, the lower shell below the pressure relief holes is symmetrically provided with assembly holes, and the assembly holes are movably provided with damping columns through plugging covers and springs; the pressure relief hole is communicated with the assembly hole.

The damping column is T-shaped.

The cutting part consists of a rotary drum and a cutter, a connecting mounting hole is formed in the rotary drum, internal threads are formed in an upper port of the connecting mounting hole, assembling holes are symmetrically formed in the rotary drum on two sides below the connecting mounting hole, and the assembling holes are communicated with the connecting mounting hole; a cutter is movably arranged in the assembly hole through a blocking cover and a spring.

And the rotary drum above and below the assembling hole is provided with a discharge hole which is communicated with the connecting and mounting hole.

The cutter is T-shaped.

The utility model has the advantages that:

This a cutting recovery instrument for deep water casing has the higher characteristics of suppression sleeve pipe vibration and cutting efficiency, hydraulic pressure through the drilling fluid makes the damping post stretch out outside the casing, the damping post blocks the vibration that produces when oil casing can effectively reduce the cutting sleeve pipe, carry out the shutoff to the casing through pitching, can continue to go deep into the sleeve pipe and carry out the secondary cutting, salvage two sections sleeve pipes of retrieving afterwards, the cutting inefficiency that has solved current cutting recovery instrument and had, and once transfer can only carry out the problem of once cutting and retrieving, the needs of well operation are abandoned to the oil have been satisfied.

Drawings

Fig. 1 is a schematic structural view of the present invention;

Fig. 2 is a schematic structural view of the upper housing of the present invention;

Fig. 3 is a schematic perspective view of the upper housing of the present invention;

Fig. 4 is a schematic structural view of the assembly pipe of the present invention;

Fig. 5 is a schematic perspective view of the assembly tube of the present invention;

FIG. 6 is a schematic diagram of the cutting operation of the present invention;

FIG. 7 is a schematic view of the clamping operation of the present invention;

FIG. 8 is a schematic diagram of the pump shutdown operation of the present invention;

fig. 9 is a schematic diagram of the lifting operation of the present invention;

FIG. 10 is a schematic view of the operation of the present invention;

Fig. 11 is a schematic diagram of the secondary cutting of the present invention.

in the figure: 1. the device comprises an upper shell, 2, a lower shell, 3, a rotating shaft, 4, a shearing pin, 5, a ball seat, 6, an upper liquid flow hole, 7, an assembly pipe, 8, a diversion hole, 9, an upper limiting block, 10, an upper clamping jaw, 11, a lifting ring, 12, a limiting flange, 13, an assembly pipe limiting platform, 14, a lower liquid flow hole, 15, a lower limiting block, 16, a lower clamping jaw, 17, a blocking cover, 18, a positioning hole, 19, a positioning insertion rod, 20, a shell limiting platform, 21, a thrust bearing, 22, a turbine assembly, 23, a limiting ring, 24, a pressure relief hole, 25, a damping column, 26, a rotating cylinder, 27, a cutter, 28, a connecting and mounting hole, 29 and a drainage hole.

Detailed Description

the cutting and recycling tool for the deepwater casing comprises an upper shell 1, a lower shell 2, a rotating shaft 3 and a cutting part, wherein the lower shell 2 is installed at the bottom end of the upper shell 1 through threads, the upper shell 1 is a reducing cylindrical body, a ball seat 5 is fixedly installed in a top port of the upper shell 1 through a shearing pin 4, the ball seat 5 is cylindrical, a central hole of the ball seat 5 is a reducing hole in a waist shape, the ball seat 5 is used for clamping a thrown soluble ball in the working process, the ball seat 5 is made of aluminum materials and can be crushed under certain pressure, upper liquid flow holes 6 are symmetrically arranged on the upper shell 1 below the ball seat 5, an assembly pipe 7 is movably sleeved on the circumference of the upper shell 1 corresponding to the upper liquid flow holes 6, the assembly pipe 7 is a reducing cylindrical body, guide holes 8 are symmetrically arranged on the assembly pipe 7, upper clamping claws 10 are installed in the guide holes 8 through upper clamping blocks 9, the upper clamping claws 10 have a limiting effect on the assembly pipe 7, the assembling pipe 7 cannot be separated from the upper shell 1 upwards, the upper limiting block 9 is connected with the assembling pipe 7 through a fastening bolt, the upper limiting block 9 is connected with the upper clamping jaw 10 in a sliding mode, the top of the upper limiting block 9 is provided with a hanging ring 11, and the hanging ring 11 is used for being connected with a hoisting tool on a drilling platform so as to lift the cut casing in the working process.

A limiting flange 12 is arranged on the assembling pipe 7 below the diversion hole 8, a stepped assembling pipe limiting table 13 is arranged on the upper surface of the limiting flange 12, and the assembling pipe limiting table 13 is annularly arranged; lower liquid flow holes 14 are symmetrically formed in the upper shell 1 below the upper liquid flow hole 6, lower clamping jaws 16 are mounted on the upper shell 1 corresponding to the lower liquid flow holes 14 through lower limiting blocks 15, the lower limiting blocks 15 are connected with the upper shell 1 through fastening bolts, and the lower limiting blocks 15 are in sliding connection with the lower clamping jaws 16. The upper clamping jaw 10 and the lower clamping jaw 16 are respectively connected with the upper shell 1 through a shearing pin 4, the upper clamping jaw 10 and the lower clamping jaw 16 are respectively h-shaped, and anti-skidding teeth are respectively uniformly distributed on the outer end faces of the upper clamping jaw 10 and the lower clamping jaw 16 so as to clamp the wall of the sleeve.

Positioning holes 18 are symmetrically formed in the upper shell 1 between the lower liquid flow hole 14 and the upper liquid flow hole 6, positioning insertion rods 19 are arranged on the lower surface of the limiting flange 12 corresponding to the positioning holes 18, and the assembling pipe 7 is movably mounted on the upper shell 1 through the positioning holes 18; the positioning inserted bar 19 is used for preventing the assembly pipe 7 from rotating, preventing the diversion hole 8 from being staggered with the upper liquid flow hole 6 to lose connectivity, and the positioning inserted bar 19 has a limiting function on the lower jaw 16 at the same time, so that the lower jaw 16 can bear higher hydraulic pressure relative to the upper jaw 10. The upper shell 1 at the bottom of the lower liquid flow hole 14 is provided with a stepped shell limiting table 20, the shell limiting table 20 is arranged in an annular shape, the stepped shell limiting table 20 and the assembling pipe limiting table 13 are respectively matched with the lower clamping jaw 16 and the upper clamping jaw 10, so that the lower clamping jaw 16 and the upper clamping jaw 10 can only move in a single direction and cannot move back, and the lower clamping jaw 16 and the upper clamping jaw 10 cannot loosen after clamping the wall of a casing.

Be provided with the external screw thread on 2 top circumferences of lower casing, there is pivot 3 through thrust bearing 21 and turbine assembly 22 movable mounting in the lower casing 2, 3 tops of pivot are equipped with spacing ring 23 through the bolt fastening, the diameter of spacing ring 23 slightly is greater than the diameter of pivot 3, so that cooperation thrust bearing 21 makes pivot 3 can' T break away from lower casing 2 downwards, the symmetry is provided with pressure release hole 24 on the lower casing 2 of thrust bearing 21 below, the symmetry is provided with the pilot hole on the lower casing 2 of pressure release hole 24 below, pilot hole and pressure release hole 24 intercommunication, there is damping post 25 through blanking cover 17 and spring movable mounting in the pilot hole, damping post 25 is the T font, damping post 25 is used for blocking the casing wall in order to reduce the vibration that the casing wall produced when the cutting.

The lower end of the rotating shaft 3 extends out of the lower shell 2, a cutting piece is installed on the end head of the bottom end of the rotating shaft 3, which extends out of one end of the lower shell 2, in a threaded mode, the cutting piece is composed of a rotating drum 26 and a cutter 27, a connecting installation hole 28 is formed in the rotating drum 26, the connecting installation hole 28 is communicated with a central hole of the rotating shaft 3, internal threads are formed in an upper port of the connecting installation hole 28, assembling holes are symmetrically formed in the rotating drum 26 on two sides below the connecting installation hole 28, and the assembling holes are communicated with the connecting installation hole 28; the drum 26 above and below the fitting hole is provided with a drain hole 29, and the drain hole 29 communicates with the attachment mounting hole 28. A cutter 27 is movably arranged in the assembly hole through the plug cover 17 and the spring, the cutter 27 is T-shaped, the end of the cutter 27 is conical, and the cutter 27 cuts the sleeve by utilizing the conical end.

The working process of the cutting and recycling tool comprises the following steps: with this cutting recovery instrument wholly transfer to appointed cutting position, to this cutting recovery instrument input high-pressure drilling fluid, drilling fluid gets into the centre bore of upper housing 1, because the drilling fluid pressure at this moment still can't cut the shear pin 4 that last jack catch 10 and lower jack catch 16 correspond, consequently drilling fluid continues to get into down in the casing 2, the drilling fluid that gets into casing 2 shunts at 3 ports of pivot: a part of drilling fluid downwards enters an assembly hole of the lower shell 2 through a gap between the rotating shaft 3 and the lower shell 2, the drilling fluid entering the assembly hole of the lower shell 2 outwards pushes the damping column 25, meanwhile, a spring between the damping column 25 and the blocking cover 17 is compressed, the damping column 25 extending out of the lower shell 2 blocks a sleeve wall, vibration generated by the sleeve during subsequent cutting is inhibited, subsequent drilling fluid is discharged out of the lower shell 2 through the drainage hole 29, in the process, the drilling fluid impacts the turbine assembly 22 to enable the turbine assembly 22 to rotate, and the turbine assembly 22 drives the rotating shaft 3 and a cutting piece at the bottom end of the rotating shaft 3 to synchronously rotate.

The other part of the drilling fluid enters the cutting part downwards through the central hole of the rotating shaft 3, the drilling fluid entering the cutting part enters the assembly hole of the rotating drum 26 along the connecting installation hole 28, the drilling fluid entering the assembly hole pushes the cutter 27 out of the rotating drum 26 in the radial direction, and meanwhile, the spring between the cutter 27 and the plug cover 17 is compressed, namely, the cutter 27 gradually extends out of the cutting sleeve while the cutting part rotates; when the casing is completely severed, the cutter 27 moves to its extreme position and engages the closure 17 with the drain hole 29 communicating with the connector mounting hole 28 and drilling fluid entering the assembly hole exits the bowl 26 through the drain hole 29 and the hydraulic pressure in the cutting recovery tool is reduced.

when the staff on the drilling platform detects that the hydraulic pressure in the cutting and recovering tool is reduced, the cutting of the casing at the first section is finished, and the hydraulic pressure of the drilling fluid is continuously increased to a set pressure value; the shear pin 4 corresponding to the upper jaw 10 is disconnected under pressure, and the positioning inserted rod 19 has a limiting effect on the lower jaw 16, so that the shear pin 4 corresponding to the lower jaw 16 cannot be disconnected under the pressure at this time; go up the shear pin 4 disconnection back that jack catch 10 corresponds, go up jack catch 10 and stretch out outside assembly pipe 7 along water conservancy diversion hole 8 gradually under the effect of hydraulic pressure to interlock casing wall specifically is: the hydraulic pressure drives the upper clamping jaw 10 to move horizontally, when the upper clamping jaw 10 contacts with an inclined plane in the flow guide hole 8, the upper clamping jaw 10 moves downwards under the guiding action of self gravity and the inclined plane in the flow guide hole 8, then the hydraulic pressure continues to drive the upper clamping jaw 10 to move horizontally until the upper clamping jaw 10 stops moving horizontally under the action of the upper limiting block 9, the upper clamping jaw 10 falls under the action of gravity after contacting with the upper limiting block 9 and is clamped with the assembly pipe limiting table 13, and the upper clamping jaw 10 cannot move backwards under the action of the assembly pipe limiting table 13.

after the upper jack catch 10 completely extends out of the clamping casing wall, the pump is stopped, the cutter 27 and the damping column 25 return to the original position under the action of the spring, only the upper jack catch 10 is in contact with the casing wall at the moment, because the upper jack catch 10 loses the limiting function on the assembly pipe 7 after being separated from the upper casing 1, the hoisting tool is started, the hoisting ring 11 is lifted up through the hoisting rope, the upper limiting block 9, the assembly pipe 7, the upper jack catch 10 and the cut casing pipe can be synchronously separated from the upper casing 1 upwards, the casing pipe is continuously lifted up to a position above a mud line, and the casing pipe is lifted up to the sea surface together after the subsequent casing pipe cutting is.

the working process of the secondary cutting sleeve of the cutting and recycling tool comprises the following steps: the cutting recovery tool is continuously put down to a second designated cutting point, a soluble ball is put into the upper shell 1, the soluble ball blocks the ball seat 5, the pump is started, the drilling fluid generates high pressure at the ball seat 5, the shearing pin 4 corresponding to the ball seat 5 is sheared under the action of hydraulic pressure, the ball seat 5 integrally moves down under the action of gravity and hydraulic pressure, and the upper fluid flow hole 6 is blocked; and when the pump pressure is further increased, the ball seat 5 is crushed under high pressure, the soluble ball loses support and falls and dissolves under the action of gravity, the drilling fluid flows downwards along the central hole of the upper shell 1, the drilling fluid pushes the vibration damping column 25 outwards to clamp the wall of the casing pipe, and the drilling fluid drives the cutting piece to rotate to cut the casing pipe.

When the hydraulic pressure is reduced, which indicates that the cutting knife 27 completely cuts off the casing, the pump pressure is increased, as the assembly pipe 7 is separated from the upper shell 1, the positioning inserted rod 19 has no limiting effect on the lower jaw 16, the shearing pin 4 corresponding to the lower jaw 16 is disconnected under the pressure, the lower jaw 16 gradually extends out of the upper shell 1 along the lower liquid flow hole 14 under the action of the hydraulic pressure until the lower jaw 16 stops moving under the action of the lower limiting block 15, and the lower jaw 16 cannot retreat under the action of the stepped shell limiting table 20, so that the function of clamping the casing wall is realized; then the pump is stopped, the cutter 27 and the damping column 25 return to the original position under the action of the spring, and the two sections of sleeves are lifted up and recovered together, namely the cutting and recovery work is completed.

This a cutting recovery instrument for deep water assembly pipe 7 has the higher characteristics of suppression assembly pipe 7 vibration and efficiency, has solved the poor and low problem of work efficiency of cutting effect that current cutting recovery instrument exists, has satisfied the needs of oil abandoning well operation.

Claims

1. The utility model provides a cutting recovery instrument for deep water sheathed tube, it is by last casing (1), casing (2) down, pivot (3) and cutting member constitute, casing (2) down are installed to the bottom screw thread of going up casing (1), there are pivot (3) through thrust bearing (21) and turbine subassembly (22) movable mounting in casing (2) down, the lower extreme of pivot (3) extends to casing (2) down outside, extend to pivot (3) the bottom end of casing (2) outer one end down and go up the screw thread and install cutting member, its characterized in that: a ball seat (5) is fixedly arranged in a port at the top of an upper shell (1) through a shearing pin (4), an upper liquid flow hole (6) is symmetrically arranged on the upper shell (1) below the ball seat (5), a lower liquid flow hole (14) is symmetrically arranged on the upper shell (1) below the upper liquid flow hole (6), an assembling pipe (7) is movably sleeved on the circumference of the upper shell (1) corresponding to the upper liquid flow hole (6), a flow guide hole (8) is symmetrically arranged on the assembling pipe (7), an upper clamping jaw (10) is arranged in the flow guide hole (8) through an upper limiting block (9), and a lower clamping jaw (16) is arranged on the upper shell (1) corresponding to the lower liquid flow hole (14) through a lower limiting block (15).

2. A cutting recovery tool for deep water casings according to claim 1, characterized in that: the upper clamping jaw (10) and the lower clamping jaw (16) are connected with the upper shell (1) through the shearing pin (4) respectively, the upper clamping jaw (10) and the lower clamping jaw (16) are h-shaped respectively, and anti-skidding teeth are uniformly distributed on the outer end faces of the upper clamping jaw (10) and the lower clamping jaw (16) respectively.

3. A cutting recovery tool for deep water casings according to claim 1, characterized in that: the upper limiting block (9) is connected with the assembly pipe (7) through a fastening bolt, the upper limiting block (9) is in sliding connection with the upper clamping jaw (10), and the top of the upper limiting block (9) is provided with a hanging ring (11);

the lower limiting block (15) is connected with the upper shell (1) through a fastening bolt, and the lower limiting block (15) is connected with the lower clamping jaw (16) in a sliding mode.

4. A cutting recovery tool for deep water casings according to claim 1, characterized in that: the upper shell (1) is a variable-diameter cylindrical body, positioning holes (18) are symmetrically formed in the upper shell (1) between the upper liquid flow hole (6) and the lower liquid flow hole (14), and the assembly pipe (7) is movably mounted on the upper shell (1) through the positioning holes (18); the upper shell (1) at the bottom of the lower liquid flow hole (14) is provided with a stepped shell limiting table (20), and the shell limiting table (20) is annularly arranged.

5. A cutting recovery tool for deep water casings according to claim 4, characterized in that: the assembling pipe (7) is a variable-diameter cylindrical body, a limiting flange (12) is arranged on the assembling pipe (7) below the diversion hole (8), and a stepped assembling pipe limiting table (13) is arranged on the upper surface of the limiting flange (12); the assembling pipe limiting table (13) is arranged annularly; the lower surface of the limit flange (12) is provided with a positioning inserted rod (19) corresponding to the positioning hole (18).

6. A cutting recovery tool for deep water casings according to claim 1, characterized in that: the circumference of the top of the lower shell (2) is provided with an external thread, the lower shell (2) below the thrust bearing (21) is symmetrically provided with pressure relief holes (24), the lower shell (2) below the pressure relief holes (24) is symmetrically provided with assembly holes, and damping columns (25) are movably arranged in the assembly holes through a blocking cover (17) and a spring; the pressure relief hole (24) is communicated with the assembly hole.

7. A cutting recovery tool for deep water casings according to claim 6, characterized in that: the damping column (25) is T-shaped.

8. a cutting recovery tool for deep water casings according to claim 1, characterized in that: the cutting piece consists of a rotary drum (26) and a cutter (27), wherein a connecting and mounting hole (28) is formed in the rotary drum (26), an internal thread is formed in an upper port of the connecting and mounting hole (28), assembling holes are symmetrically formed in the rotary drum (26) on two sides below the connecting and mounting hole (28), and the assembling holes are communicated with the connecting and mounting hole (28); a cutter (27) is movably arranged in the assembly hole through a blocking cover (17) and a spring, a discharge hole (29) is arranged on the rotary drum (26) above and below the assembly hole, and the discharge hole (29) is communicated with a connecting and mounting hole (28).

9. A cutting recovery tool for deep water casings according to claim 8, characterized in that: the cutter (27) is T-shaped.