CN110965957B - Blocking tool in oil pipe - Google Patents

Abstract

The invention discloses an oil pipe inner blocking tool for operation under pressure, wherein an unsealing spear rod is arranged in a central tube in a penetrating way and is fixed on an upper end cap through an unsealing pin, an upper end cap is fixed on the central tube, a rubber tube gland limits a sealing rubber tube on the central tube, the central tube is a hollow tube body, a linkage plunger is arranged in the lower end of the linkage plunger in the penetrating way and is sealed to form a sealing cavity, a first connecting shaft penetrates through a through hole of a rubber tube unsealing push ring, a first key groove type through hole and a through hole of a linkage plunger and is fixedly connected with a rubber tube unsealing push ring, the rubber tube unsealing push ring is connected with the linkage plunger and moves synchronously, an anchor tile conical base is sleeved and fixed on the central tube through a locking pin, the seat sealing pin limits the relative movement of the linkage plunger and the central tube, a slip is embedded between the anchor tile conical base and the conical body, a second connecting shaft penetrates through the through hole of the anchor tile push ring, the second key groove type through hole and the through hole of the linkage plunger, and is fixedly connected with the anchor tile propelling ring. The invention can be self-sealed and can realize fishing.

Description

Blocking tool in oil pipe

Technical Field

The invention relates to the technical field of operation under pressure, in particular to an inner oil pipe plugging tool.

Background

The oil and gas well operation under pressure refers to well repair operation performed by a shaft in a sealed state, the pressure in the operation process is controllable, pollution is avoided, a reservoir stratum is protected, and the method is an environment-friendly and pollution-free operation technology. With the high importance of oil reservoir protection and environmental protection of each oil field and the gradual improvement of the operation technology under pressure, the operation technology under pressure is rapidly developed, and the types of the operation devices under pressure are more and more, for example, a steel wire rope type operation device under pressure, a device for pulling and tripping under pressure, a skid-mounted hydraulic operation device under pressure, and the like. When the oil pipe is operated under pressure, the air pressure of the oil and the lantern ring is mainly controlled by a blowout preventer group, and the pressure of the oil pipe is mainly controlled by mechanical plug throwing, so that a plugging tool in the oil pipe is needed to meet the plugging requirement.

At present, the delivery mode can be divided into hydraulic pumping, steel wire delivery, free delivery and the like; the sealing mode is divided into the modes of interference fit between a reverse leather cup and the inner wall of the pipe column, mechanical action compression of a rubber cylinder, well pressure compression of the rubber cylinder and the like; the modes of a sliding block, an anchor tile, a seating nipple, a spring plate collar clamping gap and the like are divided according to the seating and hanging mode.

From the form, the inner plugging tool tends to be perfect and can basically meet the plugging requirements of various tubular column structures, but the inner plugging tool in the related technology has the defects of large plugging depth error, poor seating and hanging, poor sealing stability, incapability of fishing and the like, and further improvement and optimization are needed.

Disclosure of Invention

The invention provides an in-oil pipe plugging tool for operation under pressure, which aims to overcome the defects of the related technology, can be automatically set and anchored by the pressure of a shaft, and has the fishing function. The technical scheme is as follows:

the utility model provides a jam instrument in oil pipe for taking area to press operation, includes deblocking pin, upper end cap, deblocking spear, packing element gland, first sealing washer, sealed packing element, center tube, linkage plunger, second sealing washer, packing element expand and seal the conical body, packing element expand and seal the push ring, first connecting axle, anchor tile conical seat, locking pin, seat seal pin, slips, conical body, anchor tile push ring, second connecting axle, reducing direction head. The unsealing spear penetrates through the central tube and is fixed on the upper end cap through the unsealing pin. The upper end cap is fixed on the central tube, and the first sealing ring is sleeved on the deblocking spear so as to be sealed with the central tube. The sealing rubber cylinder is limited on the central tube by the rubber cylinder gland through being sleeved on the central tube. The center tube is the cavity body, sets up first keyway type through-hole and second keyway type through-hole on the body. The linkage plunger is arranged in the lower end of the central pipe in a penetrating mode and sleeved with a second sealing ring so as to be sealed with the central pipe. The linked plunger, the release lance and the central tube form a sealed chamber. The rubber cylinder expansion seal conical body is sleeved on the central tube, the upper end of the rubber cylinder expansion seal conical body is abutted against the sealing rubber cylinder, and the lower end of the rubber cylinder expansion seal conical body is abutted against the rubber cylinder expansion seal push ring. The first connecting shaft penetrates through the through hole of the rubber cylinder expanding and sealing push ring, the first key groove type through hole and the through hole of the linkage plunger and is fixedly connected with the rubber cylinder expanding and sealing push ring. The rubber cylinder expanding and sealing push ring is sleeved on the central tube and is connected with the linkage plunger piston through the first connecting shaft and moves synchronously. The linkage plunger is fixedly connected with the central tube through a seat seal pin. The locking pin penetrates through the through hole of the anchor tile conical base to be arranged on the central pipe in a penetrating mode, the anchor tile conical base is sleeved and fixed on the central pipe through the locking pin, and the seat sealing pin penetrates through the central pipe and is arranged on the linkage plunger in a penetrating mode to limit relative movement of the linkage plunger and the central pipe. Slips are circumferentially arranged around the central tube and are embedded between the anchor tile conical base and the conical body, the conical body is sleeved on the central tube, the anchor tile pushing ring is sleeved on the central tube and abuts against the conical body, the second connecting shaft penetrates through a through hole of the anchor tile pushing ring, the second key groove type through hole and a through hole of the linkage plunger and is fixedly connected with the anchor tile pushing ring, and the reducing guide head is connected to the central tube.

Optionally, the upper end and the lower end of the central tube are both in a threaded structure, the upper end cap is connected to the central tube through threads, and the reducing guide head is connected to the central tube through threads.

Optionally, the first connecting shaft is welded with the rubber sleeve expanding and sealing push ring, the second connecting shaft is welded with the anchor tile push ring, and the locking pin is welded with the anchor tile conical base.

Optionally, the release pin is threaded onto the upper end cap.

Optionally, the anchor shoe conical base and the conical body are provided with key grooves on one side close to the slips, and the slips are embedded on the key grooves of the anchor shoe conical base and the conical body.

Optionally, the anchor shoe conical base and the conical body are provided with four trapezoidal keyways.

Optionally, the slips are bi-directional slips, and the number of slips is four.

Optionally, the pipe joint further comprises an annular elastic component sleeved on the slips and used for fixing the slips on the central pipe.

Optionally, the seat seal pin is fitted through a cylindrical recess in the ganged plunger.

Optionally, the top of the deblocking lance is evenly provided with a plurality of one-way stepped grooves, so that a plugging tool in the fishing oil pipe can be conveniently caught.

Alternatively, seat seal pins of different diameters are installed according to a predetermined delivery depth.

The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:

when the oil field is subjected to pressurized operation and well workover, the tool is thrown to the preset depth of an oil pipe, can be automatically set and anchored by means of the pressure of a shaft, realizes the blocking in the oil pipe, effectively seals and controls the pressure in the oil pipe, is matched with a wellhead blowout preventer group to realize the pressure control of the shaft, and completes the well workover operation in a sealed state of the shaft. Meanwhile, the device has the fishing function, the setting and hanging depth is adjustable, the stability is good, the plugging requirement in the pressurized workover string is met, and the popularization value is good.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of the present invention showing the construction of a plugging tool in a tubing for use in operations under pressure.

The reference numerals in the drawings denote:

1. the sealing device comprises a deblocking pin, 2, an upper end cap, 3, a deblocking spear, 4, a rubber tube gland, 5, a first sealing ring, 6, a sealing rubber tube, 7, a central tube, 8, a linkage plunger, 9, a second sealing ring, 10, a rubber tube sealing expanding conical body, 11, a rubber tube sealing expanding push ring, 12, a first connecting shaft, 13, an anchor tile conical base, 14, a locking pin, 15, a setting pin, 16 slips, 17, an annular elastic component, 18, a conical body, 19, an anchor tile pushing ring, 20, a second connecting shaft, 21 and a reducing guide head.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1, an embodiment of the present invention provides an internal oil pipe plugging tool for a pressurized operation, which includes a deblocking pin 1, an upper end cap 2, a deblocking lance 3, a rubber sleeve gland 4, afirst seal ring 5, a sealing rubber sleeve 6, a central pipe 7, a linkage plunger 8, a second seal ring 9, a rubber sleeve sealing cone 10, a rubber sleeve sealing push ring 11, a first connecting shaft 12, an anchor shoe conical base 13, a locking pin 14, a setting pin 15, a slip 16, acone 18, an anchorshoe push ring 19, a second connecting shaft 20, and a reducinghead 21.

Here, the release lance 3 is inserted into the center tube 7 from the upper end thereof, and the release pin 1 is inserted through a through hole in the side wall of the upper cap 2 and fixed to the release pin 1, so that the release lance 3 is fixed to the upper cap 2 by the release pin 1.

Optionally, the release pin 1 is screwed onto the upper end cap 2. The upper end cap 2 is fixed to the central tube 7. Alternatively, the upper end of the base pipe 7 is threaded and the upper end cap 2 is screwed onto the base pipe 7. Thefirst sealing ring 5 is fitted over the release lance 3 to seal with the central tube 7. The rubber tube gland 4 and the sealing rubber tube 6 are sleeved on the central tube 7, and the rubber tube gland 4 limits the sealing rubber tube 6 on the central tube 7. The central tube 7 is a hollow tube body, and a first key groove type through hole and a second key groove type through hole are sequentially arranged at the lower position of the middle part of the tube body and are spaced at a certain distance.

The interlocking plunger 8 is inserted into the center tube 7 from the lower end thereof, and is fitted with the second packing 9 so as to be sealed with the center tube 7, so that the interlocking plunger 8, the release lance 3, the center tube 7, and thefirst packing 5 and the second packing 9 form a sealed chamber. The rubber cylinder expanding and sealing conical body 10 is sleeved on the central tube 7, the upper end of the rubber cylinder expanding and sealing conical body abuts against the sealing rubber cylinder 6, and the lower end of the rubber cylinder expanding and sealing conical body abuts against the rubber cylinder expanding and sealing push ring 11. And (3) enabling the first connecting shaft 12 to penetrate through the through hole of the rubber sleeve expanding and sealing push ring 11, the first key groove type through hole and the through hole of the linkage plunger 8 and be fixedly connected with the rubber sleeve expanding and sealing push ring 11. The rubber cylinder expanding and sealing push ring 11 is sleeved on the central tube 7 and is connected with the linkage plunger 8 through the first connecting shaft 12 and moves synchronously. The linkage plunger 8 is fixedly connected with the central tube 7 through a seat seal pin 15.

The locking pin 14 passes through the through hole of the anchor shoe conical base 13 and is arranged on the central tube 7 in a penetrating way, and the anchor shoe conical base 13 is sleeved and fixed on the central tube 7 through the locking pin 14. The seat seal pin 15 penetrates through the central tube 7 and is arranged on the linkage plunger 8 in a penetrating mode to limit the relative movement of the linkage plunger 8 and the central tube 7.

When the plugging tool in the oil pipe descends to a preset depth, and the pressure in the oil pipe at the preset depth is larger than the sum of the shearing force of the setting pin 15 and the pressure of the normal pressure cavity, the linkage plunger 8 and the central pipe 7 generate relative displacement, and the setting pin 15 is cut off. Alternatively, the seat seal pin 15 is fitted through a cylindrical recess in the ganged plunger 8.

Slips 16 are circumferentially arranged around the central pipe 7, embedded between the anchor shoe conical base 13 and thecone 18. Optionally, the anchor shoe conical base 13 and thecone 18 are provided with a key slot on the side adjacent to the slip 16, and the slip 16 is embedded on the key slot of the anchor shoe conical base 13 and thecone 18. Alternatively, the anchor shoe conical base 13 and thecone 18 are provided with four trapezoidal keyways.

Optionally, the slips 16 are bi-directional slips, with the number of slips being four. Optionally, an annular resilient member 17 is included that fits over the slips 16 to secure the slips 16 to the base pipe 7. For example, the annular elastic member 17 may be an annular spring. Thecone 18 is sleeved on the central tube 7, and the anchorshoe propelling ring 19 is sleeved on the central tube 7 and abuts against thecone 18. The second connecting shaft 20 penetrates through a through hole of the anchorshoe propelling ring 19, a second key groove type through hole and a through hole of the linkage plunger 8 and is fixedly connected with the anchorshoe propelling ring 19.

After the seat seal pin 15 is sheared, under the action of well pressure, the linkage plunger 8 continuously moves relative to the central tube 7, the rubber sleeve expanding and sealing push ring 11 is driven to push the rubber sleeve expanding and sealing conical body 10, and the sealing rubber sleeve 6 is extruded, so that seat seal is realized. Meanwhile, the anchortile pushing ring 19 is driven to push theconical body 18, the bidirectional slip 16 is pushed to generate radial displacement, and the seat is hung on the inner wall of the oil pipe, so that the seat-hanging anchoring is realized, and the sealing and anchoring processes are completed. The reducingguide head 21 is connected to the central tube 7.

Optionally, the lower end of the central tube 7 is threaded, and the variablediameter guide head 21 is connected to the central tube 7 by threads. Alternatively, the first connecting shaft 12 is welded with the rubber sleeve expanding and sealing push ring 11, the second connecting shaft 20 is welded with the anchorshoe push ring 19, and the locking pin 14 is welded with the anchor shoe conical base 13 to achieve a firm connection. Optionally, the top of the release lance 3 is uniformly provided with a plurality of one-way stepped grooves, so that a plugging tool in the fishing oil pipe can be conveniently caught. Alternatively, seat seal pins 15 of different diameters may be installed according to a predetermined delivery depth.

The specific operation of the oil well operation is as follows, the setting dowel 15 with different diameters is installed according to the preset delivery depth, the special delivery blowout preventer for the plugging tool is connected and installed on a main valve of a Christmas tree, and the plugging tool is installed in the blowout preventer. The main valve is opened, and the tool is thrown into the oil pipe by means of its own weight.

When the tool descends to a preset depth, and the pressure in the oil pipe at the preset depth is greater than the sum of the shearing force of the seat seal pin 15 and the pressure of the normal pressure cavity (if the seat seal is not normal, a pump truck can be used for increasing the pressure at a wellhead until the tool is seated), the linkage plunger 8 and the central pipe 7 generate relative displacement, and the seat seal pin 15 is cut off. Under the action of well pressure, the linkage plunger 8 continuously and relatively displaces with the central tube 7 to drive the rubber sleeve expanding and sealing push ring 11 to push the rubber sleeve expanding and sealing conical body 10 to extrude the sealing rubber sleeve 6, so that setting is realized, and the tool and the oil tube annulus are sealed. Meanwhile, the anchortile pushing ring 19 is driven to push theconical body 18, the bidirectional slip 16 is pushed to generate radial displacement, and the seat is hung on the inner wall of the oil pipe, so that the seat-hanging anchoring is realized, and the sealing and anchoring processes are completed.

When the tool needs to be salvaged and unpacked, a steel wire winch with a jar knocker and a special fishing tool is used for fishing the unpacked lance rod 3 from the top of the tool, the steel wire is lifted to knock, the unpacked anchor rod 3 moves upwards, when the knock force is larger than the shearing force of the unpacked anchor rod 1, the unpacked anchor rod 1 is sheared, the unpacked anchor rod 3 continues to move upwards, thefirst sealing ring 5 is separated from the central pipe 7 and loses the sealing function, a sealing cavity formed by the unpacked lance rod 3, the central pipe 7 and the linkage plunger 8 fails, the pressure on two sides of the linkage plunger 8 is balanced, the one-way thrust is relieved, the setting and the anchoring force are relieved simultaneously, meanwhile, the steel wire is further lifted, under the lifting force of the steel wire, the locking of the anchor tile is relieved, the setting of the rubber cylinder is relieved, the steel wire is lifted continuously, and the tool is taken out of the ground.

The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:

according to the tool for blocking the interior of the oil pipe during the operation under pressure, provided by the embodiment of the invention, when the well is repaired under the operation under the pressure in an oil field, the tool is delivered to the preset depth of the oil pipe, the interior of the oil pipe is blocked by setting and anchoring through well pressure, the pressure in the oil pipe is effectively closed and controlled, the setting and anchoring depth is adjustable, the stability is good, meanwhile, the tool has a salvageable function, the plugging requirement in a tubular column during the operation under the pressure is met, and the tool has a good popularization value.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. An oil pipe internal blocking tool is characterized by comprising a deblocking pin (1), an upper end cap (2), a deblocking spear (3), a rubber cylinder gland (4), a first sealing ring (5), a sealing rubber cylinder (6), a central tube (7), a linkage plunger (8), a second sealing ring (9), a rubber cylinder expanding and sealing conical body (10), a rubber cylinder expanding and sealing push ring (11), a first connecting shaft (12), an anchor tile conical base (13), a locking pin (14), a setting pin (15), a slip (16), a conical body (18), an anchor tile push ring (19), a second connecting shaft (20) and a reducing guide head (21);

the center pipe (7) is a hollow pipe body, the unsealing spear (3) is arranged in the center pipe (7) in a penetrating mode and fixed on the upper end cap (2) through the unsealing pin (1), the upper end cap (2) is fixed on the center pipe (7), and the first sealing ring (5) is sleeved on the unsealing spear (3) to be sealed with the center pipe (7); the rubber cylinder gland (4) sleeved on the central tube (7) limits the sealing rubber cylinder (6) on the central tube (7);

the linkage plunger (8) is arranged in the lower end of the central tube (7) in a penetrating mode and sleeved with a second sealing ring (9) to seal the central tube (7), the linkage plunger (8), the unsealing spear (3) and the central tube (7) form a sealing cavity, the rubber cylinder expanding and sealing conical body (10) is sleeved on the central tube (7), the upper end of the rubber cylinder expanding and sealing conical body abuts against the sealing rubber cylinder (6), and the lower end of the rubber cylinder expanding and sealing conical body abuts against the rubber cylinder expanding and sealing push ring (11);

a first key groove type through hole and a second key groove type through hole are formed in a pipe body of a central pipe (7), a first connecting shaft (12) penetrates through a through hole of a rubber sleeve seal expanding push ring (11), the first key groove type through hole and a through hole of a linkage plunger (8) and is fixedly connected with the rubber sleeve seal expanding push ring (11), the rubber sleeve seal expanding push ring (11) is sleeved on the central pipe (7) and is connected with the linkage plunger (8) through the first connecting shaft (12) and moves synchronously, a locking pin (14) penetrates through a through hole of an anchor tile conical base (13) and is arranged on the central pipe (7) in a penetrating mode, the anchor tile conical base (13) is sleeved and fixed on the central pipe (7) through the locking pin (14), a seat seal pin (15) penetrates through the central pipe (7) and is arranged on the linkage plunger (8) in a penetrating mode, when a plugging tool descends to a preset depth in an oil pipe and the preset depth is larger than the sum of the shearing force of the pressure in the seat seal pin (15) and the pressure of an atmospheric pressure cavity, the linkage plunger (8) and the central tube (7) are relatively displaced, and the seat seal pin (15) is cut off;

slips (16) circumference is arranged around center tube (7), inlay between anchor tile conical foundation (13) and conical body (18), conical body (18) suit is on center tube (7), anchor tile propulsion ring (19) suit is on center tube (7) and supports and lean on conical body (18), second connecting axle (20) pass the through-hole of anchor tile propulsion ring (19), the through-hole of second keyway type through-hole and linkage plunger (8), with anchor tile propulsion ring (19) fixed connection, reducing direction head (21) is connected on center tube (7).

2. The in-tubing plugging tool according to claim 1, wherein the upper end and the lower end of the central tube (7) are threaded, the upper end cap (2) is connected to the central tube (7) by threads, and the variable diameter guide head (21) is connected to the central tube (7) by threads.

3. The in-tubing plugging tool of claim 1, wherein the first connecting shaft (12) is welded to the rubber sleeve expanding and sealing push ring (11), the second connecting shaft (20) is welded to the anchor shoe push ring (19), and the locking pin (14) is welded to the anchor shoe conical base (13).

4. The in-tubing plugging tool of claim 1, wherein the unset pin (1) is threaded onto the upper end cap (2).

5. The in-tubing plugging tool of claim 1, wherein the anchor shoe conical base (13) and the cone (18) are provided with keyways on a side thereof adjacent to the slips (16), and the slips (16) are embedded in the keyways of the anchor shoe conical base (13) and the cone (18).

6. The in-tubing plugging tool of claim 1 or 5, wherein the anchor shoe conical base (13) and the cone (18) are provided with four trapezoidal keyways.

7. The in-tubing plugging tool of claim 1, wherein the slips (16) are bi-directional slips and the number of slips is four.

8. The in-tubing plugging tool according to claim 1, further comprising an annular resilient member (17) mounted over the slips (16) for securing the slips (16) to the base pipe (7).

9. The in-tubing plugging tool of claim 1, wherein the seat seal pin (15) is received in a cylindrical recess in the linkage plunger (8).

10. The in-tubing plugging tool according to claim 1, wherein the top of the release lance (3) is uniformly provided with a plurality of one-way stepped grooves.

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