CN-224228654-U - Slip type downhole choke

CN224228654UCN 224228654 UCN224228654 UCN 224228654UCN-224228654-U

Abstract

The utility model discloses a slip type downhole choke, and relates to the technical field of oil and gas field exploitation equipment. The slip type downhole choke comprises a main body pipe, a slip anchoring assembly arranged on the outer wall of the main body pipe, a rubber cylinder sealing assembly arranged above the slip anchoring assembly, a choke passage penetrating through the main body pipe and a salvaging connection structure arranged at the top end of the main body pipe, wherein the slip anchoring assembly comprises at least three clamping tiles which are circumferentially distributed, and the rubber cylinder sealing assembly is made of elastic sealing materials and sleeved outside the main body pipe. The slip type underground throttling device is used for solving the technical problems that an existing underground throttling device is easy to seat halfway in the throwing process, the anchoring of slips is not firm, the sealing of a rubber cylinder is invalid, the salvaging is difficult, the corrosion resistance is poor and the like.

Inventors

LU YANRUI
GUO KAILONG
LI CHANGCAI
WEI GUOFENG
Mu Guizhou
ZENG WENZHONG
SHAO ZHENGZHONG

Assignees

金湖县支点石油科技有限责任公司

Dates

Publication Date: 20260512
Application Date: 20250708

Claims (8)

1. The slip type downhole choke is characterized by comprising a main body pipe, a slip anchoring assembly arranged on the outer wall of the main body pipe, a rubber cylinder sealing assembly arranged above the slip anchoring assembly, a throttling channel penetrating through the main body pipe and a salvaging connection structure arranged at the top end of the main body pipe, wherein the slip anchoring assembly comprises at least three clamping tiles distributed in the circumferential direction, and the rubber cylinder sealing assembly is made of an elastic sealing material and sleeved outside the main body pipe.
2. The slip type downhole choke of claim 1, wherein the slip anchor assembly further includes a seat seal drive mechanism driving radial expansion of the slip segments, the seat seal drive mechanism being in interlocking engagement with a lost motion pin structure inside the body tube.
3. The slip-type downhole choke of claim 2, wherein the outer surface of the gripping tiles is provided with slip-resistant anchoring teeth having a tooth profile that is continuously serrated along the circumference of the slip segments.
4. The slip downhole choke of claim 1, wherein the packing element seal assembly comprises a plurality of superimposed layers of hydrogenated nitrile rubber layer, the inner side of the hydrogenated nitrile rubber layer closely conforms to the outer wall of the main body pipe and the outer side forms a sealing surface in contact with the inner wall of the oil pipe.
5. The slip downhole choke of claim 1, wherein a removable choke assembly is provided in the choke passage, the choke assembly being secured in the body tube by threaded connection or snap-fit.
6. The slip type downhole choke of claim 1, wherein the fishing connection structure is a convex annular fishing head, and a clamping groove or a convex edge structure matched with a fishing tool is arranged on the periphery of the annular fishing head.
7. The slip-type downhole choke of any one of claims 1-6, wherein an outer wall of the body tube is provided with an anti-midway-setting protection sleeve that can limit radial movement of the slip segments during choke delivery.
8. The slip type downhole choke of claim 7, wherein the main body pipe and the clamping tiles are made of a corrosion-resistant alloy, and an acid-resistant and alkali-resistant protective coating is arranged on the surface of the corrosion-resistant alloy.

Description

Slip type downhole choke Technical Field The utility model relates to the technical field of oil and gas field exploitation equipment, in particular to a slip type downhole choke. Background In the gas field development process, the downhole throttling technology is an important means for controlling the production pressure difference of a gas well and stabilizing the production of the gas well. Currently, the downhole throttlers widely used in the market mostly adopt slip type structures, and the throttlers are fixed on the inner wall of an oil pipe through slip anchoring. However, the existing slip type downhole throttler has a plurality of technical problems in practical application, such as unstable anchoring or insufficient sealing performance and durability of a rubber cylinder sealing assembly due to the fact that hydrate, guar gum and other foreign matters possibly exist in a shaft or the situation of accumulation of fracturing sand, wax deposition and scaling and the like exist on the inner wall of an oil pipe in the throwing process, and the throttle is easy to seat halfway when the throttle does not reach a preset position, so that the accuracy and reliability of downhole throttling operation are affected. Disclosure of Invention The utility model aims to provide a slip type underground throttle for solving the technical problems that the existing underground throttle is easy to seat in midway, the anchoring of slips is not firm, the sealing of a rubber cylinder is invalid, the salvaging is difficult, the corrosion resistance is poor and the like in the throwing process. In order to achieve the purpose, the slip type underground throttling device comprises a main body pipe, a slip anchoring assembly arranged on the outer wall of the main body pipe, a rubber cylinder sealing assembly arranged above the slip anchoring assembly, a throttling channel penetrating through the main body pipe and a salvaging connection structure arranged at the top end of the main body pipe, wherein the slip anchoring assembly comprises at least three clamping tiles distributed in the circumferential direction, and the rubber cylinder sealing assembly is made of elastic sealing materials and sleeved outside the main body pipe. Optionally, the slip anchor assembly further comprises a seat seal driving mechanism for driving the slip sheets to radially expand, and the seat seal driving mechanism is in linkage fit with a lost hand pin structure inside the main body pipe. Through the linkage design of the seat seal driving mechanism and the lost hand pin, the accurate seat seal and the lost hand pin of the throttle at the preset position are realized, and the problem of midway seat seal is avoided. Optionally, the outer surface of the slip sheet is provided with anti-slip anchoring teeth, and the tooth shapes of the anti-slip anchoring teeth are continuously distributed in a sawtooth shape along the circumferential direction of the slip sheet. The design of the serrated anti-skid anchoring teeth increases the contact area and friction force between the slips and the inner wall of the oil pipe, and can realize firm anchoring even if the inner wall of the oil pipe is uneven or slightly scaled, thereby effectively solving the problem that the slips cannot be clamped. Optionally, the packing element seal assembly includes the hydrogenation nitrile rubber layer of multilayer stack setting, the inboard of hydrogenation nitrile rubber layer with main body pipe outer wall closely laminates, and the outside forms the sealed face with oil pipe inner wall contact. The design of the multi-layer hydrogenated nitrile rubber layer not only improves the elasticity and the sealing performance of the rubber cylinder, but also enhances the corrosion resistance and the ageing resistance of the rubber cylinder, and can keep a good sealing state in a complex medium environment in the pit for a long time. Optionally, a detachable throttle nozzle assembly is arranged in the throttle channel, and the throttle nozzle assembly is fixed in the main body pipe in a threaded connection or clamping manner. The detachable throttling nozzle assembly is designed, so that workers can conveniently replace throttling nozzles with different inner diameters according to the production requirements of a gas well, accurate control of the yield of the gas well is achieved, and the applicability and flexibility of the throttling device are improved. Optionally, the salvage connection structure is the annular salvage head of evagination, annular salvage head's periphery is provided with salvage tool complex draw-in groove or bead structure. The structure design is convenient for the fishing tool to accurately capture the fishing head, and the fishing pull force can be reliably transmitted through the cooperation of the fishing tool and the clamping groove or the convex edge, so that the smooth fishing of the throttle is ensured, and the problem of difficult fishing caus