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Underground throttler

A technology of restrictor and gas nozzle pipe, which is applied in the direction of mining fluid, wellbore/well parts, earthwork drilling and production, etc. It can solve the problems of improper use position, many sealing rings, and no sand control mechanism, etc., so as to prolong the service life, Effects of preventing damage and reducing damage

Active Publication Date: 2013-03-27
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing slip-type downhole choke adopts double rubber tubes, which are easy to be damaged; there are many sealing rings and the use position is improper. After the sealing ring is damaged, sand jams will be formed, which will cause mechanical failure to cause problems, and easily cause the choke to fail or Difficulty in salvage; in addition, the traditional slip type downhole choke has no sand control mechanism, which cannot effectively prevent the problem of sand production in gas wells

Method used

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  • Underground throttler

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Embodiment 1

[0020] Embodiment 1: Taking a downhole choke suitable for 31 / 2" tubing as an example, the present invention will be further described in detail.

[0021] refer to figure 1 . The downhole restrictor mainly consists of fishing head 1, pin 2, sliding sleeve 3, upper nozzle pipe 4, slips 5, slip retaining ring 6, lower nozzle pipe 7, slip cone 8, spring 9, gas Nozzle 10, sealing rubber tube 11, spring seat 12, rubber tube cone 13, filter cover 14 and protective cover 15 are composed, sliding sleeve 3 is cylindrical, and the outer wall of sliding sleeve 3 is covered with fishing head 1, fishing head 1 There is a protruding annular step on the outer wall of the lower end, and two grooves are symmetrically distributed on the annular step, and the upper ends of the two slips 5 are in the groove, and the slips 5 are suspended on the annular step; the outer arc of the slip 5 The face diameter is 76mm, which is the same as the diameter of the inner wall of the tubing. There is an annu...

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Abstract

The invention discloses an underground throttler, which is applied in the technical field of gas extracting in an oil and gas field. A fishing head is sheathed on the outer wall of a sliding sleeve; a slips is suspended at the lower end of the fishing head; a slips cone is in threaded connection with the outer wall of the lower end of the sliding sleeve; an upper gas nozzle pipe is fixed in the sliding sleeve through a pin; the slips cone is provided with a central hole which is provided with a lower gas nozzle pipe; the lower end of the lower gas nozzle pipe is provided with a spring; the lower end of the spring is provided with a circular spring seat; a gas nozzle is embedded at the lower part of the stepped central hole of the lower gas nozzle pipe; a seal rubber cylinder is fixed at the lower end of the slips cone; a rubber cylinder cone is arranged at the lower part of the seal rubber cylinder; a protection cover is connected with the lower end of the rubber cylinder cone; and a filter mask is in threaded connection with the lower end of the lower gas nozzle pipe. The underground throttler of the invention has the beneficial effects of adopting the seal rubber cylinder and the rubber cylinder cone to lead the seat sealing to be more reliable, adjusting the position of a seal ring, adopting a spline structure and a knob unloading ring to reduce the damage of the seal ring and prolong the service life of the seal ring, and reducing the damage of the produced sand to the trottler.

Description

technical field [0001] The invention relates to the technical field of gas recovery in oil and gas fields, in particular to a downhole choke for controlling gas recovery and production in natural gas wells, and is a downhole choke suitable for oil and gas wells with self-spraying capability. Background technique [0002] At present, downhole chokes have been applied in natural gas wells for natural gas production control. Chinese Patent Publication No. CN2471929Y provides a "downhole choke nozzle and fishing tool for choke nozzle thereof". Including rubber cylinder, seat seal tool, central tube, air nozzle cover, fishing head, slips, retaining ring, ceramic air nozzle, piston rod, spring, spring seat, upper framework rubber cylinder, rubber cylinder sliding sleeve, lower framework rubber cylinder , lower piston, cone, sand control inner cover and sand control outer cover. Special fishing tools are required for salvage. It can reduce pressure and throttling gas production ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/12
Inventor 李莲明李强王磊徐勇赵军友刘小江马春稳田喜军侯亚龙刘鹏王少波刘敬
Owner PETROCHINA CO LTD
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