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CN-122014172-A - Slip type downhole choke

CN122014172ACN 122014172 ACN122014172 ACN 122014172ACN-122014172-A

Abstract

The invention belongs to the technical field of natural gas exploitation, and particularly provides a slip type underground throttle which comprises a throttle body, slips and a plurality of installation guide mechanisms, wherein the slips are connected under the throttle body, the installation guide mechanisms are connected to the outer side of the upper part of the throttle body, the installation guide mechanisms are distributed at equal intervals in the circumferential direction, the installation guide mechanisms comprise guide mechanisms and installation mechanisms, the outer sides of the throttle body are connected with the guide mechanisms through the installation mechanisms, the problem that the existing throttle body is easy to collide or rub with a well wall to cause damage when being put in is solved, and when the surface of the well wall is concave-convex in the well entering process, the impact caused by the concave-convex surface of the well wall is effectively absorbed and dispersed through the guide mechanisms, so that the influence of vibration or impact on the throttle body is reduced.

Inventors

  • YANG XUDONG
  • LI YANBIN
  • JIA YOULIANG
  • WEI YAMING
  • ZHAO BINBIN
  • XIAO SHUQIN
  • LIU SHICHUN
  • SU YUBIN
  • YAN ZHICHEN
  • FENG FEI

Assignees

  • 中国石油天然气股份有限公司

Dates

Publication Date
20260512
Application Date
20241111

Claims (10)

  1. 1. A slip type underground throttle is characterized by comprising a throttle (1), slips (2) and a plurality of installation guide mechanisms, wherein the slips (2) are connected under the throttle (1), the installation guide mechanisms are connected to the outer side of the upper portion of the throttle (1), the installation guide mechanisms are distributed at equal intervals circumferentially, each installation guide mechanism comprises a guide mechanism (3) and an installation mechanism (4), and the outer side of the throttle (1) is connected with the guide mechanism (3) through the installation mechanism (4).
  2. 2. The slip type downhole choke of claim 1, wherein the guiding mechanism (3) comprises an executing component (31), a buffering component (32) and a driving component (33), and the lower outer side of the executing component (31) is connected with the buffering component (32) through the driving component (33) in a lower mode.
  3. 3. The slip type downhole choke of claim 2, wherein the executing assembly (31) comprises a main frame (311), a supporting frame, a wheel frame (313) and a plurality of guide wheels (315), the inner side of the main frame (311) is connected with the installing mechanism (4), the outer side of the upper part of the main frame (311) is connected with the wheel frame (313) through the supporting frame, the wheel frame (313) is connected with the plurality of guide wheels (315), and the plurality of guide wheels (315) are distributed at intervals from top to bottom.
  4. 4. The slip type downhole choke of claim 3, wherein the main frame (311) comprises a bottom plate (311-1) and a connecting plate (311-2), the bottom plate (311-1) and the connecting plate (311-2) are vertically arranged, and the middle part of the outer side of the bottom plate (311-1) is vertically connected with the connecting plate (311-2).
  5. 5. The slip type downhole choke of claim 4, wherein the bottom plate (311-1) is provided with 2 first holes (316), and the 2 first holes (316) are symmetrically distributed with the connecting plate (311-2) as a center.
  6. 6. The slip type downhole choke of claim 4, wherein the buffer assembly (32) comprises an outer cylinder (321), a piston (322), a guide rod (323), a connector (324), a sliding seat (325) and a first spring (326), wherein the sliding seat (325) is internally connected with the connecting plate (311-2) in a sliding manner, the lower part of the outer part of the sliding seat (325) is connected with the connector (324), the connector (324) is connected with the piston (322) through the lower part of the guide rod (323), the guide rod (323) is sleeved with the first spring (326), the piston (322) is sleeved with the outer cylinder (321), and the lower part of the outer cylinder (321) is connected with the outer side of the connecting plate (311-2).
  7. 7. The slip type downhole choke of claim 6, wherein a reinforcing rib (327) is arranged between the connecting head (324) and the sliding seat (325).
  8. 8. The slip type downhole choke of claim 6, wherein a chute (317) is vertically arranged in the middle of the connecting plate (311-2).
  9. 9. The slip type downhole choke of claim 6, wherein the driving assembly (33) comprises 2 driving units, lower ends of the 2 driving units are pivoted with the sliding seat (325), and upper ends of the 2 driving units are pivoted with the wheel frame (313).
  10. 10. The slip type downhole choke of claim 9, wherein the driving unit comprises a connecting frame (331), a barrel rod (332), a barrel frame (333) and a second spring (334), the barrel rod (332) is connected to the connecting frame (331), the barrel rod (332) is slidably connected to the inside of the barrel frame (333), the second spring (334) is sleeved outside the barrel rod (332), the connecting frame (331) is pivoted with the sliding seat (325), and the barrel frame (333) is pivoted with the wheel frame (313).

Description

Slip type downhole choke Technical Field The invention belongs to the technical field of natural gas exploitation, and particularly relates to a slip type downhole choke. Background In the early stage of natural gas well development, the wellhead pressure is high, if the valve is fully opened for production, the flow is overlarge and the downstream pipeline is overpressured, so that the general exploitation mode is to install a needle valve for controlling the flow at the wellhead to control the gas flow, which is called throttling. For a high-pressure gas well, as the temperature of the fluid at the wellhead is low, the temperature of the rear end of the throttle valve is reduced while the flow rate is controlled, hydrates are generated, and the ice can block the fluid channel, so that the gas well cannot be produced. In addition, the high-pressure fluid pressure can be reduced in the throttling process, so that the throttling process is a temperature-reducing and pressure-reducing process. The traditional development mode is to naturally convey high-pressure fluid of a plurality of wells from a wellhead to a gas collecting station, a heating furnace in the station heats low-temperature fluid to more than 40 ℃ firstly, then the high-temperature high-pressure fluid passes through a throttle valve, the high-temperature high-pressure fluid is changed into low-temperature low-pressure fluid, the low temperature is still higher than the hydrate forming temperature, meanwhile, the throttled pressure is greatly reduced, and an output pipeline of the gas collecting station is changed from a high-pressure grade to a low-pressure grade. The wellhead to the gas collecting station is high pressure, so that the gas collecting pipeline is of high pressure grade, and a matched heating furnace is needed in the station, so that the cost is high and the management difficulty is high. The underground throttle valve in the traditional development mode is moved to a position above 40 ℃ in a shaft from a gas collecting station, so that the constant ground temperature is used for heating instead of a heating furnace, the pressure at the rear end of the underground throttle valve can be reduced while the underground throttle valve prevents hydrate from generating, the original conveying pipeline from a wellhead to the gas collecting station is changed from high pressure to low pressure, the pipeline grade is reduced, and the cost is reduced. The mode cancels the condition that the conveying pipeline from the heating furnace, the wellhead to the gas collecting station is changed into a low-pressure grade, and in addition, personnel management is not needed, so that the overall cost is greatly reduced. Slip-type downhole throttlers are core tools for downhole throttling processes and play an important role in natural gas production in gas fields. It is mainly placed in a proper position of the production string for implementing a restriction depressurization in the wellbore, thereby diverting the surface restriction process into the wellbore. The design fully utilizes geothermal heating, so that the temperature of the throttled air flow is higher than the highest temperature of hydrate formation under the pressure condition after throttling, thereby effectively preventing hydrate blockage from being formed in a shaft, a wellhead and a ground pipeline; The throttle realizes the control of fluid flow through the throttle device (such as an air tap) arranged in the throttle. In the oil well production process, the fluid flow entering the wellhead can be controlled by adjusting the opening degree of the throttling device according to the production requirement. When the wellhead pressure is too high, the flow rate of the fluid is properly reduced by the restrictor, so that the wellhead pressure is reduced, and conversely, when the wellhead pressure is too low, the flow rate of the fluid is properly increased by the restrictor, so that the wellhead pressure is increased. Therefore, the flow rate of the restrictor is continuously regulated, so that the wellhead pressure is kept in a reasonable range, and the stable production of the oil well is ensured; The slip type downhole choke device is fixed in a shaft by a slip mechanism, the slips are outwards expanded under preset conditions (such as pressure change or operation instructions) and tightly bite the well wall, and therefore stable position of the choke device in the shaft is ensured. The fixing mode not only improves the working stability of the throttle, but also effectively prevents displacement or damage caused by vibration or impact; The invention discloses an easy-to-release slip type downhole choke disclosed by the invention through a checking disclosure (bulletin) number of CN216950330U, the technology discloses an easy-to-release slip type downhole choke, which relates to the technical field of chokers, and comprises a casting and fishing assembly and a choke assembly, wher