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Check valve assembly, gas-lift valve, gas-lift tool and integrated string

A single-flow valve and gas lift valve technology, which can be used in the production of fluids, drill pipes, casings, etc., can solve problems such as low work efficiency and waste of resources.

Inactive Publication Date: 2017-10-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a check valve assembly, a gas lift valve, a gas lift tool, and an integrated pipe string to solve the problem of the need to take out the oil from the well after acid fracturing and self-spraying production in the existing carbonate well mining process. The acid fracturing string in the section is lowered into the gas lift completion string to realize gas lift production, which leads to serious waste of resources in the well and low work efficiency.

Method used

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  • Check valve assembly, gas-lift valve, gas-lift tool and integrated string
  • Check valve assembly, gas-lift valve, gas-lift tool and integrated string
  • Check valve assembly, gas-lift valve, gas-lift tool and integrated string

Examples

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Effect test

Embodiment 1

[0030] figure 1 A schematic structural diagram of a one-way valve assembly provided in Embodiment 1 of the present invention, as shown in figure 1 As shown, the one-way valve assembly 1 provided in this embodiment includes: a valve body 11, a one-way assembly 12 and a plug 13;

[0031] Wherein, a through hole 110 is provided inside the valve body 11, the first end 111 of the through hole is connected to the bellows 2, and the second end 112 of the through hole is provided with a plug 13, when the pressure at the second end 112 of the through hole reaches the first pressure , the plug 13 is separated from the second end 112 of the through hole.

[0032] The one-way component 12 is arranged in the through hole 110. When the fluid flowing through the valve body 11 flows from the first end 111 of the through hole to the second end 112 of the through hole, the one-way component 12 is opened, so that the through hole 110 is in a smooth state; When the fluid flows from the second e...

Embodiment 2

[0046] figure 2 A schematic structural view of the gas lift valve provided in Embodiment 2 of the present invention, as shown in figure 2 As shown, this embodiment provides a gas lift valve, which includes the check valve assembly 1 provided in the first embodiment above, and the bellows 2 .

[0047] Specifically, the bellows 2 is provided with a valve ball 21 and a valve seat 22, and the end of the bellows 2 is connected to the check valve assembly 1, that is, the end of the bellows 2 is connected to the inside of the valve body 11 of the check valve assembly 1. The first end 111 of the through hole is fixedly connected.

[0048] Wherein, the structure and working principle of the check valve assembly 1 are the same as those of the above-mentioned embodiments, and will not be repeated here. The bellows 2 is pre-filled with high-pressure nitrogen to provide closing pressure for the gas lift valve. When the annular pressure exceeds the closing pressure, the bellows 2 is com...

Embodiment 3

[0052] image 3 Schematic diagram of the structure of the gas lift mandrel provided in Embodiment 3 of the present invention, as shown in image 3 As shown, the gas lift tool 3 provided in this embodiment includes the gas lift valve provided in Embodiment 2 and the gas lift mandrel.

[0053] Specifically, the gas lift working cylinder includes: a hollow cylinder body 31 and a fixed chamber 32 arranged on the outer wall of the cylinder body 31 and close to the end of the cylinder body 31 .

[0054] Preferably, both ends of the cylinder body 31 are provided with threaded connection holes 33, and the two ends of the cylinder body 31 are connected to the oil pipe through the threaded connection holes 33, and the threaded connection holes 33 are air-tight buckles.

[0055] Optionally, the threaded connecting hole 33 can be an internally threaded connecting hole and be air-tight. Specifically, the air-tight seal is sealed by a metal end face. After being put in place, the end face...

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Abstract

The invention provides a check valve assembly, a gas-lift valve, a gas-lift tool and an integrated string. The check valve assembly provided by the invention comprises a valve body, a one-way assembly and an end cap; a fluid in the valve body can only flow to a second end of a through hole from a first end of the through hole through arranging the one-way assembly in the through hole of the valve body, so that one-way flowing of the fluid is achieved; the compressive property of the check valve assembly is improved through arranging the end cap at the second end of the through hole in the valve body, and the gas-lift valve can still keep normal working in an acid fracturing transformation process at high pressure, so that the one-way assembly can be directly put into a well in the acid fracturing transformation process, and the string does not need to be replaced before gas-lift production, thereby completing acid fracturing transformation and gas-lift production through running the string, shortening the operation time and improving the work efficiency.

Description

technical field [0001] The invention relates to the technical field of oil field recovery, in particular to a check valve assembly, a gas lift valve, a gas lift tool and an integrated pipe string. Background technique [0002] In the development process of carbonate reservoirs, horizontal well segmental stimulation technology has become the main means to improve single well production and efficient development. Carbonate horizontal wells generally have a horizontal section with a length of about 500-800m. In order to effectively develop different types of reservoirs in the horizontal section, a staged acid fracturing method must be used to achieve targeted acid fracturing for different types of reservoirs. After completion of reservoir acid fracturing, self-spraying and liquid drainage are carried out. The life cycle of carbonate wells during self-spraying is generally short, and the self-spraying production time is usually between several months and several years. When it f...

Claims

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Application Information

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IPC IPC(8): E21B34/08E21B43/12E21B33/122E21B43/08E21B43/27E21B17/00
CPCE21B17/00E21B33/122E21B34/08E21B43/086E21B43/122E21B43/123E21B43/26
Inventor 周建平季晓红郭道忠张浩张雪松杨小龙张明辉
Owner PETROCHINA CO LTD
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