Slip throttler

Abstract

The utility model provides a slip throttler, which is characterized in that a release sub is inserted at the upper end of a mandrel, a release pin is arranged between the mandrel and the release sub in a penetrating manner, a fishing neck is sleeved on the outer side of the mandrel, the lower end of the fishing neck is inserted between an outer central pipe and the mandrel, and a snap ring is arranged on the outer wall surface of the mandrel; the outer wall face of the clamping ring is sleeved with a first sealing ring matched with the inner wall face of the fishing neck, the outer side of the fishing neck is sleeved with an upper well cap, the upper well cap is inserted into the upper end of the upper slip bowl, a fixing screw is arranged between the upper well cap and the upper slip bowl in a penetrating mode, a second sealing ring is arranged between the upper well cap and the fishing neck, and a shear pin seat is arranged between the upper slip bowl and the fishing neck. A deblocking shear pin is arranged between the upper slip bowl and the shear pin seat in a penetrating mode, and a deblocking space is arranged between the shear pin seat and the upper well cap. According to the slip throttler, the clamping ring and the first sealing ring are arranged between the mandrel and the fishing neck, and the second sealing ring is arranged between the upper well cap and the fishing neck, so that gravel is prevented from entering the throttler, and normal setting and unsetting of the throttler are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of throttles, in particular to a slip throttle. Background Art

[0002] The downhole throttling process technology is to place the downhole throttling device at an appropriate position of the production tubing to achieve throttling and pressure reduction in the wellbore, transfer the ground throttling process to the wellbore, make full use of geothermal heating, make the temperature of the gas flow after throttling higher than the maximum temperature for hydrate formation under the pressure conditions after throttling, and at the same time bury the ground gas gathering pipeline under the permafrost layer, so that hydrate blockage will not form in the wellbore, wellhead and ground pipeline.

[0003] When placing or salvaging a downhole choke, a steel wire needs to be lowered into the well for construction. When the choke is in the wellbore, it is affected by sand settling, which may cause sand and gravel blockage between the core shaft and the outer center pipe, and between the shear pin seat and the upper well cap, thereby affecting the normal sealing and unsealing of the choke. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in order to overcome the deficiency in the prior art that the throttle is affected by sand deposition, which may cause sand and gravel blockage between the core shaft and the outer center pipe, and between the shear nail seat and the upper well cap, thereby affecting the normal sealing and unsealing of the throttle, the utility model provides a slip throttle.

[0005] The technical solution to be adopted by the utility model to solve its technical problems is: a slip throttle, including a core shaft, a slip assembly and a rubber cylinder assembly, the core shaft is sleeved with an outer center tube, the rubber cylinder assembly includes an upper rubber cylinder seat and a lower rubber cylinder seat sleeved on the outer center tube and slidably connected to the outer center tube, a plurality of sealing rubber cylinders are arranged between the upper rubber cylinder seat and the lower rubber cylinder seat, the lower end of the outer center tube is sleeved with a locking ring for clamping the outer center tube on the core shaft, the locking ring is abutted against the inner side of the lower rubber cylinder seat, the slip assembly includes an upper slip seat and a lower slip seat sleeved on the outer center tube and slidably connected to the outer center tube, a plurality of slips evenly arranged along the circumference of the core shaft are arranged between the upper slip seat and the lower slip seat, the lower slip seat and the upper rubber cylinder seat abut against each other,

[0006] A release joint is inserted at the upper end of the mandrel, a release pin is inserted between the mandrel and the release joint, a fishing neck is sleeved on the outer side of the mandrel, the lower end of the fishing neck is inserted between the outer center tube and the mandrel, a clamping ring is provided on the outer wall of the mandrel, and a first sealing ring matching the inner wall of the fishing neck is sleeved on the outer wall of the clamping ring.

[0007] An upper well cap is sleeved on the outside of the salvage neck, and the upper well cap is inserted into the upper end of the upper slip seat. A fixing screw is passed through the upper well cap and the upper slip seat, a second sealing ring is provided between the upper well cap and the salvage neck, a shear nail seat is provided between the upper slip seat and the salvage neck, an unsealing shear nail is passed between the upper slip seat and the shear nail seat, and an unsealing space is provided between the shear nail seat and the upper well cap.

[0008] The throttle is connected to the wire rope through a release joint and lowered into the wellbore. When the throttle is lowered to the predetermined position, the wire rope winch brakes suddenly, the core shaft does not move, and the lower rubber cylinder seat, the sealing rubber cylinder, the upper rubber cylinder seat and the lower slip seat on the core shaft remain in position through the locking ring. The salvage neck, the upper well cap, the shear nail seat and the upper slip seat slide down as a whole under the action of inertia. This inertial force is sufficient to make the upper slip seat and the lower slip seat cooperate with each other to open multiple slips so that the slips are engaged with the inner wall of the wellbore; after the slips are engaged with the inner wall of the wellbore, the slips, the upper slip seat and the lower slip seat remain in position, the wire rope is lifted, the core shaft moves up with the wire rope, and a relative displacement occurs between the core shaft and the outer center tube. During the upward movement of the core shaft, the lower rubber cylinder seat is driven to move up through the locking ring, and the lower rubber cylinder seat squeezes and deforms the sealing rubber cylinder to complete the sealing.

[0009] The clamping ring cooperates with the first sealing ring to seal the gap between the core shaft and the salvage neck to prevent the sediment from entering between the core shaft and the outer center tube from the gap between the core shaft and the salvage neck, thereby causing the core shaft and the outer center tube to be unable to move relative to each other and affecting the normal seating of the sealing rubber cylinder.

[0010] The second sealing ring between the upper well cap and the fishing neck is used to seal the gap between the upper well cap and the fishing neck to prevent the sediment from entering the unsealing space from the gap between the upper well cap and the fishing neck, thereby affecting the normal disconnection of the unsealing shear pins on the shear pin seat.

[0011] Furthermore, in order to ensure the stable installation of the snap ring, an annular groove cooperating with the snap ring is provided on the outer wall surface of the core shaft, and the snap ring is partially embedded in the annular groove. The snap ring is composed of two semicircular iron sheets arranged opposite to each other.

[0012] Furthermore, a connecting sleeve is sleeved on the outer side of the core shaft, a lower well cap is sleeved on the upper end of the connecting sleeve, the lower well cap is threadedly connected to the lower rubber cylinder seat, and the lower end of the connecting sleeve is threadedly connected to the outer wall surface of the core shaft.

[0013] Furthermore, the lower end of the mandrel is threadedly connected with a valve seat, the upper end of the valve seat is abutted against the lower end of the connecting sleeve, the lower end of the valve seat is connected with a sand control pipe, the inner side of the sand control pipe is provided with a flow connecting rod, and the lower end of the sand control pipe is provided with a guide head. The sand control pipe can effectively prevent mud and sand from entering the throttle.

[0014] Furthermore, a nozzle shear nail seat is provided at the inner side of the nozzle seat, and a nozzle shear nail is passed through the nozzle seat and the nozzle shear nail seat.

[0015] The beneficial effects of the utility model are as follows: the utility model provides a slip throttle, wherein a clamping ring and a first sealing ring are arranged between the core shaft and the fishing neck, and a second sealing ring is arranged between the upper well cap and the fishing neck, so as to prevent sand and gravel from entering the throttle and ensure that the throttle can be normally sealed and unsealed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a structural schematic diagram of the best embodiment of the utility model;

[0018] Figure 2 yes Figure 1 A is an enlarged schematic diagram;

[0019] Figure 3 yes Figure 1 A magnified schematic diagram of B;

[0020] Figure 4 yes Figure 1 A magnified schematic diagram of C in the middle.

[0021] In the figure: 1, release joint, 2, fishing neck, 3, release pin, 4, retaining ring, 5, upper well cap, 6, fixing screw, 7, core shaft, 8, unsealing shear nail, 9, shear nail seat, 10, upper slip seat, 11, outer center pipe, 12, slip, 13, lower slip seat, 14, upper rubber cylinder seat, 15, sealing rubber cylinder, 16, spacer ring, 17, lower rubber cylinder seat, 19, locking ring, 20, lower well cap, 21, connecting sleeve, 23, air nozzle seat, 24, air nozzle shear nail seat, 25, air nozzle shear nail, 26, flow connecting rod, 27, sand control pipe, 28, guide head, 29, second sealing ring, 30, first sealing ring. DETAILED DESCRIPTION

[0022] Now the utility model is described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the utility model in a schematic manner, so it only shows the components related to the utility model.

[0023] like Figure 1-4As shown, a slip throttle of the utility model includes a core shaft 7, a slip assembly and a rubber cylinder assembly, the core shaft 7 is sleeved with an outer center tube 11, the rubber cylinder assembly includes an upper rubber cylinder seat 14 and a lower rubber cylinder seat 17 which are sleeved on the outer center tube 11 and slidably connected to the outer center tube 11, a plurality of sealing rubber cylinders 15 are arranged between the upper rubber cylinder seat 14 and the lower rubber cylinder seat 17, and a spacer ring 16 is arranged between adjacent sealing rubber cylinders 15, a locking ring 19 for clamping the outer center tube 11 on the core shaft 7 is sleeved at the lower end of the outer center tube 11, the locking ring 19 is abutted against the inner side of the lower rubber cylinder seat 17, the slip assembly includes an upper slip seat 10 and a lower slip seat 13 which are sleeved on the outer center tube 11 and slidably connected to the outer center tube 11, a plurality of slips 12 evenly arranged along the circumference of the core shaft 7 are arranged between the upper slip seat 10 and the lower slip seat 13, the lower slip seat 13 and the upper rubber cylinder seat 14 abut against each other,

[0024] A release joint 1 is inserted at the upper end of the mandrel 7, a release pin 3 is inserted between the mandrel 7 and the release joint 1, a fishing neck 2 is sleeved on the outer side of the mandrel 7, and the lower end of the fishing neck 2 is inserted between the outer center tube 11 and the mandrel 7, a clamping ring 4 is provided on the outer wall of the mandrel 7, and a first sealing ring 30 matching the inner wall of the fishing neck 2 is sleeved on the outer wall of the clamping ring 4.

[0025] An upper well cap 5 is sleeved on the outside of the salvage neck 2, and the upper well cap 5 is inserted into the upper end of the upper slip seat 10. A fixing screw 6 is passed between the upper well cap 5 and the upper slip seat 10. A second sealing ring 29 is provided between the upper well cap 5 and the salvage neck 2. A shear nail seat 9 is provided between the upper slip seat 10 and the salvage neck 2. An unsealing shear nail 8 is passed between the upper slip seat 10 and the shear nail seat 9. An unsealing space is provided between the shear nail seat 9 and the upper well cap 5.

[0026] An annular groove cooperating with the clamping ring 4 is arranged on the outer wall surface of the core shaft 7, and the clamping ring 4 is partially embedded in the annular groove. The clamping ring 4 is composed of two semicircular iron sheets arranged opposite to each other.

[0027] The outer side of the core shaft 7 is sleeved with a connecting sleeve 21 , the upper end of the connecting sleeve 21 is sleeved with a lower well cap 20 , the lower well cap 20 is threadedly connected to the lower rubber cylinder seat 17 , and the lower end of the connecting sleeve 21 is threadedly connected to the outer wall of the core shaft 7 .

[0028] The lower end of the core shaft 7 is threadedly connected with a valve seat 23, the upper end of the valve seat 23 is abutted against the lower end of the connecting sleeve 21, the lower end of the valve seat 23 is connected to a sand control tube 27, a flow connecting rod 26 is provided inside the sand control tube 27, and a guide head 28 is provided at the lower end of the sand control tube 27.

[0029] An air nozzle shear nail seat 24 is disposed inside the air nozzle seat 23 , and an air nozzle shear nail 25 is inserted between the air nozzle seat 23 and the air nozzle shear nail seat 24 .

[0030] Working process:

[0031] The choke is connected to the wire rope through the hand-release joint 1 and lowered into the wellbore. When the choke is lowered to the predetermined position, the wire rope winch brakes suddenly, the mandrel 7 does not move, and the lower rubber cylinder seat 17, the sealing rubber cylinder 15, the upper rubber cylinder seat 14 and the lower slip seat 13 on the mandrel 7 remain unchanged through the locking ring 19. The fishing neck 2, the upper well cap 5, the shear nail seat 9 and the upper slip seat 10 slide down as a whole under the action of inertia. This inertial force is sufficient to make the upper slip seat 10 and the lower slip seat 13 cooperate with each other to open the multiple slips 12 so that the slips 12 are engaged with the inner wall of the wellbore; after the slips 12 are engaged with the inner wall of the wellbore, the slips 12, the upper slip seat 10 and the lower slip seat 13 remain in place, the wire rope is lifted, the core shaft 7 moves up with the wire rope, and a relative displacement occurs between the core shaft 7 and the outer center tube 11. During the upward movement of the core shaft 7, the lower rubber cylinder seat 17 is driven to move up through the locking ring 19, and the lower rubber cylinder seat 17 squeezes and deforms the sealing rubber cylinder 15 to complete the sealing.

[0032] When the pulling force of the wire rope on the release joint 1 is large enough, the release pin 3 is disconnected, the release joint 1 is separated from the core shaft 7, the throttle remains in the wellbore to work, and the wire rope takes the release joint 1 out of the wellbore.

[0033] When the throttle is salvaged, the salvage tool is connected to the salvage neck 2 and the salvage tool is jarred upward to cut off the unsealing shear nail 8. After the lower end of the salvage neck 2 is offset from the front end of the outer center tube 11, the outer center tube 11 can slide down along the core shaft 7. When the outer center tube 11 slides downward, the lower slip seat 13 can be driven to slide downward, thereby unblocking the slip 12 and releasing the contact between the slip 12 and the inner wall of the oil pipe.

[0034] Directions and references (e.g., up, down, left, right, etc.) in the present invention may only be used to assist in the description of features in the accompanying drawings. Therefore, the following detailed description is not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0035] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the scope of the utility model through the above description. The technical scope of this utility model is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A slip throttle, comprising a core shaft (7), a slip assembly and a rubber cartridge assembly, wherein the core shaft (7) is sleeved with an outer central tube (11), the rubber cartridge assembly comprises an upper rubber cartridge seat (14) and a lower rubber cartridge seat (17) sleeved on the outer central tube (11) and slidably connected to the outer central tube (11), a plurality of sealing rubber cartridges (15) are arranged between the upper rubber cartridge seat (14) and the lower rubber cartridge seat (17), and the lower end of the outer central tube (11) is sleeved with a rubber cartridge for sealing the outer central tube (11). A locking ring (19) is clamped on the core shaft (7), and the locking ring (19) is arranged against the inner side of the lower rubber cylinder seat (17). The slip assembly comprises an upper slip seat (10) and a lower slip seat (13) which are sleeved on the outer center tube (11) and slidably connected to the outer center tube (11). A plurality of slips (12) are arranged uniformly along the circumference of the core shaft (7) between the upper slip seat (10) and the lower slip seat (13). The lower slip seat (13) and the upper rubber cylinder seat (14) are in contact with each other. Features: A release joint (1) is inserted into the upper end of the core shaft (7), a release pin (3) is inserted between the core shaft (7) and the release joint (1), a fishing neck (2) is sleeved on the outer side of the core shaft (7), the lower end of the fishing neck (2) is inserted between the outer center tube (11) and the core shaft (7), a clamping ring (4) is provided on the outer wall surface of the core shaft (7), and a first sealing ring (30) matching the inner wall surface of the fishing neck (2) is sleeved on the outer wall surface of the clamping ring (4). An upper well cap (5) is sleeved on the outer side of the fishing neck (2), and the upper well cap (5) is inserted into the upper end of the upper slip seat (10). A fixing screw (6) is inserted between the upper well cap (5) and the upper slip seat (10). A second sealing ring (29) is provided between the upper well cap (5) and the fishing neck (2). A shear nail seat (9) is provided between the upper slip seat (10) and the fishing neck (2). An unsealing shear nail (8) is inserted between the upper slip seat (10) and the shear nail seat (9), and an unsealing space is provided between the shear nail seat (9) and the upper well cap (5).

2. A slip throttle according to claim 1, characterized in that: An annular groove cooperating with the clamping ring (4) is provided on the outer wall surface of the core shaft (7), and the clamping ring (4) is partially embedded in the annular groove. The clamping ring (4) is composed of two semicircular iron sheets arranged opposite to each other.

3. A slip throttle according to claim 1, characterized in that: The outer side of the core shaft (7) is sleeved with a connecting sleeve (21), the upper end of the connecting sleeve (21) is sleeved with a lower well cap (20), the lower well cap (20) is threadedly connected to the lower rubber cylinder seat (17), and the lower end of the connecting sleeve (21) is threadedly connected to the outer wall surface of the core shaft (7).

4. A slip throttle as claimed in claim 3, characterized in that: The lower end of the core shaft (7) is threadedly connected to a gas nozzle seat (23), the upper end of the gas nozzle seat (23) is abutted against the lower end of the connecting sleeve (21), the lower end of the gas nozzle seat (23) is connected to a sand control pipe (27), a flow connecting rod (26) is provided inside the sand control pipe (27), and a guide head (28) is provided at the lower end of the sand control pipe (27).

5. A slip throttle as claimed in claim 4, characterized in that: An air nozzle shear nail seat (24) is provided inside the air nozzle seat (23), and an air nozzle shear nail (25) is inserted between the air nozzle seat (23) and the air nozzle shear nail seat (24).

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