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Throttler under shaft and oil field gas production system

A technology of choke and orifice, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc. It can solve the problems of downhole choke, deformation of slips and rubber tubes, damage of downhole choke and Oil pipe tightness and other issues

Active Publication Date: 2017-06-16
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Since the downhole choke is suspended in the tubing through the stretched slip seal, when the downhole gas pressure is high, the slips and the rubber sleeve will be deformed, destroying the sealing between the downhole choke and the tubing, and cannot be realized. The role of downhole throttling

Method used

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  • Throttler under shaft and oil field gas production system
  • Throttler under shaft and oil field gas production system
  • Throttler under shaft and oil field gas production system

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Such as figure 1 As shown, the embodiment of the present invention provides a downhole choke, the downhole choke includes:

[0041] Sleeve 1, upper slider 2, lower slider 3, baffle plate 4, claw 5, first falling body 6, second falling body 7 and lower joint 8;

[0042] The top of the sleeve 1 is connected to the oil pipe, the bottom of the sleeve 1 is connected to one end of the lower joint 8, the other end of the lower joint 8 is connected to the oil pipe, and the claw 5 is fixed on the inner wall of the lower joint 8;

[0043] The baffle 4 is installed on the lower end surface of the sleeve 1, and the baffle 4 is provided with a throttling hole 41;

[0044] The upper slider 2 and the lower slider 3 are fixed on the inner wall of the sleeve 1 through the shear pin 9, the upper slider 2 and the lower slider 3 are connected, and one end of the lower slider 3 protrudes from the sleeve 1 and blocks the baffle 4 from covering the sleeve 1 lower end face;

[0045] The dia...

Embodiment 2

[0078] An embodiment of the present invention provides an oil and gas field gas recovery system, the oil and gas field gas recovery system includes a downhole string structure, the downhole string structure includes the downhole choke described in Embodiment 1, and the downhole high pressure is realized through the downhole choke Gas throttling.

[0079] In the embodiment of the present invention, the two ends of the downhole choke are first connected with the oil pipe outside the well, and the connected oil pipe and the downhole choke are inserted into the downhole at the same time. 6. The first falling body 6 closes the sliding sleeve 3, and at the same time exerts pressure on the first falling body 6 until the shear pin 9 between the sliding sleeve 3 and the sleeve 1 is cut off, and the sliding sleeve 3 falls into the claw 5. At this time, the baffle 4 Cover the lower end surface of the sleeve 1, and the downhole high-pressure gas flows to the wellhead through the throttle ...

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PUM

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Abstract

The invention discloses a throttler under a shaft and an oil field gas production system, and belongs to the technical field of oil-gas field gas production. The throttler under the shaft comprises a sleeve, an upper sliding canister, a lower sliding canister, a baffle, an elastic claw, a first falling body, a second falling body and a lower connector; the top of the sleeve is connected to an oil tube, the bottom of the sleeve is connected to the lower connector, the lower connector is connected to the oil tube, and the elastic claw is fixed on the inner wall of the lower connector; the baffle is installed on the lower end surface of the sleeve, and the baffle is internally provided with an orifice; the upper sliding canister and the lower sliding canister are fixed on the inner wall of the sleeve through shear pins, the diameter of the first falling body is bigger than or equal to the inner diameter of the lower sliding canister and smaller than the inner diameter of the upper sliding canister, and the diameter of the second falling body is bigger than or equal to the inner diameter of the upper sliding canister. The throttler under the shaft can work normally when located under the super-high pressure shaft, and the problem that the throttler under the shaft is washed to a shaft mouth caused by arisen slip deformation of a normal throttler under the shaft in the high pressure shaft or throttling cannot be achieved due to rubber sleeve deformation under high pressure is solved.

Description

technical field [0001] The invention relates to the technical field of oil and gas field gas recovery, in particular to a downhole restrictor and an oil and gas field gas recovery system. Background technique [0002] In the process of gas production in oil and gas fields, high-pressure natural gas will be produced. When the high-pressure natural gas flows to the wellhead, the temperature at the wellhead is low, and there may be a problem that the high-pressure natural gas generates hydrates and blocks the natural gas pipeline. In order to solve this problem, downhole throttling The device is lowered into the well, so that the high-pressure natural gas can be decompressed through the throttle port of the downhole restrictor. [0003] The outer wall of the current downhole choke is equipped with slips and rubber tubes. The downhole choke is lowered to the designated position of the tubing by rope operation, and the steel wire is lifted up to deform the slips of the downhole c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/12E21B33/10
CPCE21B33/10E21B43/122Y02T10/30
Inventor 马辉运尹强喻成刚邓友超彭杨魏微杨云山
Owner PETROCHINA CO LTD