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Method for replacing flange steel ring on gas production tree without releasing under pressure

A technology of X-mas tree and flange, applied in earthwork drilling, wellbore/well components, etc., can solve the problems of potential safety hazards, incomplete plugging, secondary leakage, etc., and achieve a safe and effective construction process

Inactive Publication Date: 2018-02-16
JILIN BEIKE OIL & GAS TECH SERVICE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a method of replacing the flange steel ring on the gas production tree under pressure without losing hands, so as to solve the problems of incomplete plugging, secondary leakage and potential safety hazards existing in the prior art

Method used

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  • Method for replacing flange steel ring on gas production tree without releasing under pressure
  • Method for replacing flange steel ring on gas production tree without releasing under pressure
  • Method for replacing flange steel ring on gas production tree without releasing under pressure

Examples

Experimental program
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Effect test

Embodiment 1

[0042] See attached Figure 3-6 , the method for replacing the flange steel ring on the gas tree under pressure without losing hands of the present invention comprises the following steps:

[0043] Step 1: Install two support blocks 12 on the lower end face of the large cross 1 flange of the gas tree with respect to the symmetrical position of the center of the large cross 1 flange; Two fixed connections 1201 holes and one oil cylinder connection hole 1202, bolts 13 pass through the fixed connections 1201 holes of the support block 12 to fix the support block 12 on the large cross 1 flange;

[0044] Step 2: Install the plugging tool transmission device on the two support blocks 12, open the No. 1 valve 4, and use the hydraulic pump station to transmit the plugging tool to the corresponding position of the large cross 1 through the plugging tool transmission device to realize the seat card seat seal The transmission device of the blocking tool includes two oil cylinders 8 resp...

Embodiment 2

[0056]The difference between this embodiment and Embodiment 1 is that step a is added between step 3 and step 4: an adjustable tool holder 14 is installed on the upper end of the large cross 1 flange, and the adjustable tool holder 14 is adjusted to withstand The tail end of the occluder is to prevent the seat card of the occluder from being flushed out due to failure; add step b between step 6 and step 7: remove the adjustable tool holder 14.

[0057] The method of replacing the flange steel ring on the gas tree under pressure without losing hands in this embodiment includes the following complete steps:

[0058] Step 1: Install two support blocks 12 on the lower end face of the large cross 1 flange of the gas tree with respect to the symmetrical position of the center of the large cross 1 flange; Two fixed connections 1201 holes and one oil cylinder connection hole 1202, bolts 13 pass through the fixed connections 1201 holes of the support block 12 to fix the support block 1...

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Abstract

The invention discloses a method for replacing a flange steel ring on a gas production tree without releasing under pressure, and belongs to the technical field of gas production auxiliary tools. Theproblems that in the prior art, leaking stoppage is not thorough, secondary leakage occurs, and potential safety hazards exist are solved. The method comprises the following steps that two supportingblocks are installed on a flange of a large cross of a gas production tree; a plugging tool conveying device is installed on the two supporting blocks, and a blanking plug is conveyed to the corresponding position of the large cross to achieve clamping and sealing through a conveying rod; an upper flange is lifted; an adjustable type tool fixator is installed to stand up to the blanking plug; theconveying rod is removed, and the steel ring is replaced; the conveying rod is installed, and the blanking plug is pressed; the adjustable type tool fixator is removed; an upper flange sealing grooveis washed, and sealing grease is evenly smeared; a sealing power ring is installed, and the upper flange is connected with the large cross flange; and whether air leakage occurs or not is detected, ifyes, sealing is conducted again, if no, clamping releasing and sealing releasing are conducted, the blanking plug is pulled out by utilizing a hydraulic power pack through the plugging tool conveyingdevice, a first valve is closed, and replacing is completed.

Description

technical field [0001] The invention belongs to the technical field of gas extraction auxiliary appliances, and in particular relates to a method for replacing a flange steel ring on a gas extraction tree under pressure without losing hands. Background technique [0002] In the prior art, when the natural gas in the underground gas-bearing layer is collected to the ground, the gas tree is generally used, and the drill holes are arranged according to the gas reservoir conditions, so that the gas flow can flow smoothly from the gas well to the ground, and enter the gas gathering pipe network after treatment. See attached figure 1 , in the actual use process, after the gas tree has been used for a period of time, the steel ring 2 between the upper flange 3 below the No. 1 valve 4 and the flange of the large cross 1 is prone to leakage. [0003] In order to solve the leakage situation of the above-mentioned steel ring 2, the following two methods are generally adopted in the pr...

Claims

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Application Information

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IPC IPC(8): E21B23/00
CPCE21B23/00
Inventor 宋尧建刘伟东
Owner JILIN BEIKE OIL & GAS TECH SERVICE CO LTD
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