CN219910690U - Slip type sand prevention downhole choke easy to put in and drag out - Google Patents

Abstract

The utility model relates to the technical field of oilfield gas production, and provides an easy-to-drag slip type sand control downhole choke which comprises an outer central tube, a drag-and-release assembly, a drag-and-pull slip assembly, a rubber cylinder, a delivery assembly and a choke assembly. Through the technical scheme, the problem that the unlocking and the deblocking are not thorough when the clamping and the setting are easy to sit midway and salvage during delivery in the prior art is solved.

Description

Slip type sand prevention downhole choke easy to put in and drag out

Technical Field

The utility model relates to the technical field of oilfield gas production, in particular to an easily-thrown slip type sand control downhole choke.

Background

In the exploitation process of the high-pressure natural gas well, the gas collecting pressure of a wellhead is required to be reduced, the gas production is controlled, and the gas exploitation production is mainly carried out in a gas tap throttling mode. In order to prevent hydrate blockage from easily occurring when the gas production wellhead is cooled after throttling, an underground throttling gas production process is generally adopted. The slip type choke with the air tap is blocked and sealed on the inner wall of an underground oil pipe through the well testing steel wire, depressurization and gas flow control production are carried out, the gas flow is heated by stratum heat again in the ascending process, hydrate blockage is not easy to occur, and when the gas flow needs to be started, the slip type choke is fished out of a wellhead through the well testing steel wire descending with a fishing tool.

At present, the slip type underground throttler widely applied has the problems that the slip type underground throttler is easy to sit and clamp midway during delivery, is not thorough in unlocking and deblocking during salvaging, has poor sand filtering and preventing effects and the like, so that the slip type throttler needs to be further improved in casting and salvaging success rate, and the sand filtering and preventing effects are further improved.

Disclosure of Invention

The utility model provides an easy-to-drag slip type sand control downhole choke, which solves the problems that in the prior art, the slip type sand control downhole choke is easy to sit and seal midway during delivery and is not thoroughly unlocked during salvage.

The technical scheme of the utility model is as follows:

an easy-to-drag slip type sand control downhole choke comprises an outer central tube, a salvage deblocking assembly, a pulling slip assembly, a rubber cylinder, a delivery assembly and a choke assembly, wherein the salvage deblocking assembly, the pulling slip assembly and the rubber cylinder are sequentially sleeved on the outer central tube,

the salvaging and unsealing assembly comprises a salvaging and capturing head, a lifting back cap, unsealing shear pins, an unsealing and pulling cap and a limiting locking block, wherein a boss is arranged at the upper end of the salvaging and capturing head, the unsealing and pulling cap is arranged at the lower end of the salvaging and capturing head, the lifting back cap is arranged on the salvaging and capturing head in a sliding mode, two ends of the unsealing shear pins are respectively arranged on the lifting back cap and the unsealing and pulling cap, one end of the lifting and pulling slip assembly is arranged on the lifting back cap, and the limiting locking block is abutted with the outer central tube after penetrating through the lifting and pulling slip assembly;

the delivery assembly comprises an inner tube and a connecting assembly, the connecting assembly is arranged at one end of the inner tube, the other end of the inner tube penetrates through the outer central tube and the salvaging and unsealing assembly, the connecting assembly is in unidirectional self-locking with the lower end of the outer central tube, and the throttling assembly is arranged at one end of the inner tube close to the connecting assembly.

As a further technical scheme, outer center tube lower extreme has the sawtooth external screw thread, coupling assembling includes catch, locking back of the body cap, connects to press cover and seal to press the seat, locking back of the body cap and connection press the cover with interior heart tube threaded connection, seal press the seat with be connected to press cover threaded connection, seal press the seat connect to press cover and locking back of the body cap from the top down arrange in proper order, the catch is located connect to press the cover inboard, connect to press the cover with have accommodation space between the interior heart tube, the catch with outer center tube lower extreme one-way auto-lock, outer center tube lower extreme passes behind the catch slip be located accommodation space is interior, the packing element with seal presses the seat butt.

As a further technical scheme, the lifting slip assembly comprises

The expansion assembly is arranged on the lifting back cap;

the slip lower seat is arranged on the outer central tube in a sliding mode and is provided with a second T-shaped chute.

As a further technical aspect, the expansion assembly comprises

The slip upper seat is arranged on the lifting back cap, and the lower end of the slip upper seat is provided with a first T-shaped chute;

the slip piece, the slip piece has a plurality of, slip piece both ends all with first T shape chute with the sloping platform of second T shape chute looks adaptation, a plurality of slip piece both ends set up respectively first T shape chute with in the second T shape chute, the lower extreme outer disc of slip piece is tooth form structure.

As a further technical solution, the throttle assembly comprises

The air tap support is arranged at one end of the inner core pipe, which is close to the connecting component;

the throttle air tap is arranged in the air tap support;

the slit sieve tube is arranged at one end, close to the throttle air tap, of the connecting component, and the throttle air tap is positioned in the slit sieve tube;

and the screen pipe lining ring is arranged in the slotted screen pipe.

As a further technical scheme, the upper end of the slip upper seat is provided with a through groove, the upper end of the outer central tube is provided with a groove, and the limiting locking block penetrates through the through groove and then is abutted with the groove.

The working principle and the beneficial effects of the utility model are as follows:

according to the utility model, the underground steel wire test belt delivery tool is adopted to connect the inner pipe of the utility model, the underground steel wire test belt delivery tool is lowered into a preset position from the inside of the oil pipe, and the slip piece is propped up and clamped on the inner wall of the oil pipe by rapidly lowering the drilling effect generated by suddenly stopping, so that the purpose of no movement after clamping is realized; the rubber cylinder is compressed and deformed to be propped against the inner wall of the oil pipe, so that the sealing purpose after setting is realized; continuing to jolt up to disengage the delivery tool from the slip-type downhole choke. When the utility model needs to be lifted out, the well head is lifted out by taking a fishing tool from the well head oil pipe through a well testing steel wire, grasping the fishing catch head of the utility model and lifting up to unlock the seal. When the slip lower seat or the rubber cylinder slides, the slip piece between the slip upper seat and the slip lower seat is propped open to be clamped, the diameters of two ends of the slip type downhole throttle are relatively larger to prevent the midway clamping, the outer diameter of the slip piece in the middle is smaller in the retraction state, and meanwhile, the outer diameters of the slip lower seat and the rubber cylinder are smaller, so that the midway clamping caused by friction with the protrusion attachments on the inner wall or the inner wall of an oil pipe can be avoided when the throttle goes down. The key of unlocking is that the outer central tube is separated from the upper slip seat, and the lower slip seat moves to drive the slip to retract. The deblocking control mechanism adopts a limiting locking piece to penetrate through the upper slip seat and be embedded into the groove on the outer wall of the outer central tube to form connection, a deblocking Feng La cap is sleeved outside the limiting locking piece to prevent the limiting locking piece from falling out, the deblocking pulling cap is pulled during deblocking to enable the limiting locking piece to lose the outer sleeve limit, and the outer central tube pushes away the limiting locking piece, so that the outer central tube is separated from the upper slip seat and is in a deblocking state; the outer wall of the outer central tube is provided with a protruding step, the slip lower seat is provided with an inner protruding step, and the slip lower seat can be forced to move by the step of the step shock slip lower seat of the outer central tube, so that the slip piece is promoted to retract and unclamp. Solves the problems that the prior art is easy to sit and block midway during delivery and the unlocking and the sealing are not thorough during salvage.

Drawings

The utility model will be described in further detail with reference to the drawings and the detailed description.

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic view of the lower bowl of the slip according to the present utility model;

FIG. 3 is a schematic illustration of the upper slip bowl of the present utility model;

FIG. 4 is a schematic view of a slip assembly according to the present utility model;

FIG. 5 is a schematic diagram of a salvage decapsulation component according to the present utility model;

FIG. 6 is a schematic diagram of a delivery assembly according to the present utility model;

FIG. 7 is a schematic view of a locking ring according to the present utility model;

FIG. 8 is a schematic view of the present utility model in a seated position;

FIG. 9 is a schematic diagram of the unpacking state of the present utility model;

in the figure: 1. the device comprises an outer central pipe, 2, a salvaging deblocking assembly, 3, a salvaging capturing head, 4, a lifting back cap, 5, deblocking shear pins, 6, a deblocking pulling cap, 7, a boss, 8, a lifting slip assembly, 9, a rubber cylinder, 10, a delivery assembly, 11, an inner pipe, 12, a locking ring, 13, a connecting assembly, 14, a throttling assembly, 15, a slip lower seat, 16, a second T-shaped chute, 17, a slip upper seat, 18, a first T-shaped chute, 19, a slip piece, 20, an air nozzle support, 21, a throttling air nozzle, 22, a slotted screen, 23, a screen pipe lining ring, 24, a through groove, 25, a limiting locking piece, 26, an anti-loosening back cap, 27, a connecting pressing sleeve, 28 and a sealing pressing seat.

Detailed Description

The technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The embodiment shown in fig. 1-7 provides an easy-to-drag slip type sand control downhole choke comprising an outer central tube 1, a salvage deblocking assembly 2, a salvage capturing head 3, a lifting back cap 4, a deblocking shear pin 5, a deblocking back cap 6, a rubber sleeve 9, an inner central tube 11, a lock ring 12, a connecting assembly 13, a slip lower seat 15, a slip upper seat 17, a slip piece 19, an air nozzle support 20, a choke nozzle 21, a slotted screen 22, a screen lining ring 23, a limiting lock block 25, a locking back cap 26, a connecting pressure sleeve 27 and a sealing pressure seat 28.

The lifting back cap 4 is sleeved into the salvaging capturing head 3, and then the salvaging capturing head 3 is connected with the unsealing pulling cap 6 through threads, so that the parts are connected to form the salvaging unsealing assembly 2. Three slip members 19 are connected to the first T-shaped chute 18 of the slip upper bowl 17 and the second T-shaped chute 16 of the slip lower bowl 15, respectively, to connect the components together to form a pull slip assembly 8. The outer central tube 1, the lifting slip assembly 8 and the salvaging and deblocking assembly 2 are connected through two limiting locking blocks 25, the lifting back cap 4 is connected with the slip upper seat 17 through threads, the lifting back cap 4 and the deblocking back cap 6 are connected through two deblocking shear pins 5, and finally the rubber cylinder 9 is sleeved from the lower end of the outer central tube 1, so that parts are connected to form the outer central tube salvaging Jie Fengdi slip assembly.

The locking back cap 26, the connecting pressing sleeve 27, the locking ring 12 and the sealing pressing seat 28 are sleeved in from the upper end of the inner core tube 11 in sequence, the locking back cap 26, the connecting pressing sleeve 27 and the delivery inner core tube 11 are connected through threads, and the sealing pressing seat 28 and the connecting pressing sleeve 27 are connected through threads, so that the parts are connected to form the delivery assembly 10. The throttle air tap 21 is installed in the air tap support 20 for connection, and the screen liner ring 23 is installed in the slotted screen 22.

The delivery assembly 10 is inserted into the outer central tube for salvaging Jie Fengdi and the slip assembly is pulled, the saw tooth external threads at the bottom of the outer central tube 1 are used for expanding and meshing the saw tooth internal threads of the locking ring 12, and the delivery assembly can only be continuously inserted and meshed downwards, but cannot be pulled upwards to be separated from each other for self-locking.

As described above, the air nozzle support 20 assembly is sleeved into the lower end of the inner core tube 11 of the delivery assembly 10, then the slotted screen 22 is sleeved into the air nozzle support 20 assembly, the slotted screen 22 is connected with the connecting pressing sleeve 27 on the delivery assembly 10 through threads, the locking screw is screwed into the screw hole on the outer body of the slotted screen 22, and the locking screw is jacked into the groove between the connecting pressing sleeve 27 and the locking back cap 26 on the delivery assembly 10, and the utility model is assembled.

As shown in figure 8, in the utility model, when the well testing steel wire lower belt delivery tool is in butt joint with the inner core pipe 11, the inner core pipe is lowered into a preset position in the well from the inside of the oil pipe, the external core pipe is fished Jie Fengdi to pull the slip assembly to slide downwards relative to the delivery assembly 10 through the rapid lowering and stopping the drilling effect, when the rubber barrel 9 and the sealing pressing seat 28 are tightly and non-slidable, when the slip lower seat 15 and the rubber barrel 9 are tightly and non-slidable, the slip upper seat 17 continues to slide downwards, the inclined table at the upper end of the slip piece 19 slides along the first T-shaped chute 18 of the slip upper seat 17, the inclined table at the lower end of the slip piece 19 slides along the second T-shaped chute 16 of the slip lower seat 15, the slip piece 19 is propped up and clamped on the inner wall of the oil pipe, and meanwhile, the saw tooth external thread lock ring 12 at the lower part of the external core pipe 1 is propped up, moves downwards, is meshed and is self-locked in a sitting state, and the slip piece 19 is in an anchoring and non-moving state after sitting up;

lifting the well testing steel wire, enabling the delivery assembly 10 to pull the slip assembly relative to the outer central tube for fishing Jie Fengdi, enabling the slip lower seat 15 to be pressed on the slip piece 19 and not to move, enabling the rubber cylinder 9 to be pressed on the lower end face of the slip lower seat 15 and not to move, enabling the rubber cylinder 9 to be pressed upwards by the sealing pressing seat 28, being deformed and spread to be attached to the inner wall of the oil pipe, enabling the lock ring 12 to ascend, enabling the sawtooth internal threads of the lock ring 12 to be spread by the sawtooth external threads at the lower part of the outer central tube 1, being upwards moved, meshed and self-locked, and accordingly keeping a setting state; rubber sealing rings are arranged between the inner wall of the oil pipe and the outer wall of the rubber cylinder 9, between the inner wall of the rubber cylinder 9 and the outer wall of the outer central pipe 1 and between the inner wall of the outer central pipe 1 and the outer wall of the inner central pipe 11, and the rubber sealing rings on the outer wall of the inner pipe 11, the inner wall of the air nozzle support 20 and the outer wall of the throttle air nozzle 21 form a combined seal, so that underground gas is forced to pass through the inner hole of the throttle air nozzle 21 after impurities such as silt can only be filtered through a slot of the slot screen 22, and enter the upper oil pipe along the inner hole of the inner central pipe 11 until wellhead extraction.

Continuing to lift the jarring, the delivery assembly 10 is further enabled to pull the slip assembly relative to the outer central tube for salvaging Jie Fengdi to slide upwards, the packing element 9 is continuously compressed for setting, when the jarring force reaches the action of triggering the delivery tool to take off hands, the delivery tool is released from the delivery inner tube 11, and the well testing steel wire can lift the delivery tool out of the wellhead.

As shown in fig. 9, when the utility model needs to be lifted out, a fishing tool is carried down from the wellhead oil pipe through a well testing steel wire, when the fishing tool grabs a boss 7 of a fishing capturing head 3, the well testing steel wire is lifted up to drive a fishing unsealing assembly 2 to move upwards, a lifting back cap 4 connected with a slip upper seat 17 cannot move because a slip piece 19 is clamped on the inner wall of the oil pipe, at the moment, the unsealing cap 6 moves upwards relative to the lifting back cap 4, so that unsealing shear pins 5 connected between the unsealing cap 6 and the lifting back cap 4 are sheared, the jacket limit is lost when the unsealing cap 6 is separated from the outer circular surface of a limit locking block 25, a glue cylinder 9 pushes a throwing assembly 10 to move downwards under the self-resilience force, the locking ring 12 and an outer central pipe 1 are in a self-locking state, the outer central pipe 1 is driven to move downwards together, the limit locking block 25 is pushed away, and unsealing is completed, and the slip lower seat 15 loses the upward jacking force of the glue cylinder 9 to be in a free state;

continuing to lift the well testing steel wire, driving the salvaging deblocking assembly 2 to move upwards, and driving the lifting slip assembly 8 to move upwards when the deblocking cap 6 is contacted with the lifting back cap 4, so that the slip upper seat 17 moves upwards, the upper inclined table of the slip piece 19 slides along the first T-shaped chute 18 of the slip upper seat 17, and the lower inclined table of the slip piece 19 slides along the second T-shaped chute 16 of the slip lower seat 15, and the slip piece 19 is pulled back to shrink to release the slip; the well head can be lifted out by continuously lifting the well testing steel wire.

When the lifting salvaging deblocking assembly 2 shears the deblocking shear pin 5 and the deblocking difficulty is met, the feeding assembly 10 can be jarred downwards, and the locking ring 12 and the outer central tube 1 are in a self-locking state and drive the outer central tube 1 to move downwards, so that the space between the sealing pressing seat 28 and the slip lower seat 15 is pulled away, and the rubber cylinder 9 can rebound for deblocking; when the outer circular step of the outer central tube 1 contacts with the inner hole step of the slip lower seat 15, the downward jarring delivery assembly 10 is continued, so that the outer central tube 1 jars the slip lower seat 15 and moves downward, and the slip is driven to retract to forcibly release the clip.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (6)

1. The easy-to-put and pull slip type sand prevention downhole choke comprises an outer central tube (1), a salvage deblocking assembly (2), a lifting slip assembly (8), a rubber cylinder (9), a delivery assembly (10) and a choke assembly (14), wherein the salvage deblocking assembly (2), the lifting slip assembly (8) and the rubber cylinder (9) are sequentially sleeved on the outer central tube (1),

the salvaging and unsealing assembly (2) comprises a salvaging and capturing head (3), a lifting and pulling back cap (4), unsealing shear pins (5), unsealing and pulling caps (6) and a limiting locking piece (25), wherein a boss (7) is arranged at the upper end of the salvaging and capturing head (3), the unsealing and pulling caps (6) are arranged at the lower end of the salvaging and capturing head (3), the lifting and pulling back cap (4) is slidably arranged on the salvaging and capturing head (3), two ends of the unsealing shear pins (5) are respectively arranged on the lifting and pulling back cap (4) and the unsealing and pulling caps (6), one end of the lifting and pulling slip assembly (8) is arranged on the lifting and pulling back cap (4), and the limiting locking piece (25) is abutted with the outer central tube (1) after penetrating through the lifting and pulling slip assembly (8).

The delivery assembly (10) comprises an inner tube (11) and a connecting assembly (13), the connecting assembly (13) is arranged at one end of the inner tube (11), the other end of the inner tube (11) penetrates through the outer central tube (1) and the salvaging and deblocking assembly (2), the connecting assembly (13) is in unidirectional self-locking with the lower end of the outer central tube (1), and the throttling assembly (14) is arranged at one end of the inner tube (11) close to the connecting assembly (13).

2. The slip-type sand control downhole choke easy to cast and drag according to claim 1, characterized in that the lower end of the outer central tube (1) is provided with saw tooth external threads, the connecting assembly (13) comprises a lock ring (12), an anti-loose back cap (26), a connecting pressing sleeve (27) and a sealing pressing seat (28), the anti-loose back cap (26) and the connecting pressing sleeve (27) are in threaded connection with the inner central tube (11), the sealing pressing seat (28) is in threaded connection with the connecting pressing sleeve (27), the sealing pressing seat (28), the connecting pressing sleeve (27) and the anti-loose back cap (26) are sequentially arranged from top to bottom, the lock ring (12) is located on the inner side of the connecting pressing sleeve (27), an accommodating space is reserved between the connecting pressing sleeve (27) and the inner central tube (11), the lower end of the outer central tube (1) is in one-way self-locking through the lock ring (12) and is located in the accommodating space after sliding through the lock ring (12), and the lower end of the outer central tube (1) is in contact with the sealing seat (28).

3. The easy-to-drag slip sand control downhole choke of claim 1, wherein the pull slip assembly (8) comprises

The expansion assembly is arranged on the lifting back cap (4);

and the slip lower seat (15) is arranged on the outer central tube (1) in a sliding manner, and the slip lower seat (15) is provided with a second T-shaped chute (16).

4. The easy-to-fish slip sand control downhole choke of claim 3, wherein the expansion assembly comprises

The slip upper seat (17), the slip upper seat (17) is arranged on the lifting back cap (4), and a first T-shaped chute (18) is arranged at the lower end of the slip upper seat (17);

the slip piece (19), slip piece (19) have a plurality of, slip piece (19) both ends all with first T shape chute (18) with the sloping platform of second T shape chute (16) looks adaptation, a plurality of slip piece (19) both ends set up respectively in first T shape chute (18) with in second T shape chute (16), the lower extreme outer disc of slip piece (19) is tooth form structure.

5. The easy-to-fish slip sand control downhole choke of claim 1, wherein the choke assembly (14) includes

The air tap support (20) is arranged at one end of the inner core tube (11) close to the connecting component (13);

the throttle air tap (21) is arranged in the air tap support (20);

the slit sieve tube (22) is arranged at one end, close to the throttle air tap (21), of the connecting assembly (13), and the throttle air tap (21) is positioned in the slit sieve tube (22);

and a screen liner ring (23) arranged in the slotted screen (22).

6. The slip-type sand control downhole choke with easy casting and pulling according to claim 4, wherein a through groove (24) is formed in the upper end of the slip upper seat (17), a groove is formed in the upper end of the outer central tube (1), and the limiting lock block (25) is abutted with the groove after penetrating through the through groove (24).