Bond-type gas well opening slow-plugging device and application method thereof

A technology of ties and gas wells, applied in wellbore/well valve devices, wellbore/well parts, earthwork drilling and production, etc., can solve the problems of difficult management and maintenance of gas wells, save manpower and material resources, reduce maintenance difficulty, The effect of broad application prospects

Active Publication Date: 2018-12-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The first object of the present invention is to overcome the difficult problem of gas well management and maintenance caused by the way of injecting alcohol at the well head or artificial well opening when the gas well is opened to freeze and block; the second object is to reduce the consumption of manpower and material resources; the third object It is to clean up the hydrate in time and dredge the pipeline

Method used

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  • Bond-type gas well opening slow-plugging device and application method thereof
  • Bond-type gas well opening slow-plugging device and application method thereof
  • Bond-type gas well opening slow-plugging device and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] When opening a gas well in a gas field, when the pressure is high, the needle valve must be manually operated to throttle and reduce the pressure when opening the well, so as to prevent the downstream pipeline pressure of the needle valve from exceeding the designed pressure of 6.3MPa, because the throttling process is inevitably When there is a cooling phenomenon, a certain amount of hydrate will be gradually generated in the wellhead pipeline downstream of the needle valve, and due to the throttling and cooling phenomenon of the wellhead needle valve during the well opening process, part of the hydrate particles formed by the well opening will go down with the airflow and block the wellhead surface The swirling flowmeter downstream of the pipeline caused ice blockage in the pipeline. In order to solve the ice blockage of the pipeline and clear the pipeline, this embodiment provides a tie-type gas well opening and plugging prevention device, such as figure 1 As shown, th...

Embodiment 2

[0027] On the basis of Example 1, such as figure 1 with image 3 As shown, the inner cavity of the oil pipe 2 is also provided with a hydrate filter disc 4, and the hydrate filter disc 4 is placed in the downstream inner cavity of the oil pipe 2 perpendicular to the central axis of the oil pipe 2 and located downstream of the tie-type vortex generator 3.

[0028] The working process and working principle of the tie-in gas well opening and blocking device are as follows;

[0029] The tie-type gas well opening and plugging relief device is connected between the gas well needle valve and the gas well flow meter. When the gas well is opened, extreme low temperature is generated in the wellhead pipeline downstream of the needle valve, hydrate is formed in the pipeline, and the hydrate gradually grows. The tie-type vortex generator 3 induces the airflow in the pipeline to generate a relatively regular vortex flow pattern, and uses the purge characteristics of the vortex, Enhance the air...

Embodiment 3

[0031] On the basis of Example 2, such as figure 2 As shown, the tie-type vortex generator 3 has a wavy tie-like structure, and the wavy tie-like structure has a plurality of vortex waveform periods, and the waveform of each vortex waveform period is twisted. The angle between the tangent to the outer edge of the tie of the tie type vortex generator 3 and the central axis of the oil pipe 2 is 50 degrees. The tethered vortex generator 3 has two vortex waveform periods.

[0032] The tie-type vortex generator 3 can induce the airflow in the pipeline to produce a relatively regular vortex flow pattern, and utilize the purging characteristics of the vortex to enhance the airflow carrying liquid, reduce the adhesion of liquid phase on the pipe wall, and alleviate the formation of hydrate particles. And the grown hydrate particles are stripped from the pipe wall and blown downstream to prevent them from long-term attachment to the pipe wall downstream of the needle valve and continue t...

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Abstract

The invention provides a bond-type gas well opening slow-plugging device and an application method thereof. The bond-type gas well opening slow-plugging device comprises an oil pipe. A plurality of bond-type vortex generators are mounted in an inner cavity of the oil pipe and fixed to the inner wall of the oil pipe in a linear shape in the axial direction of the oil pipe. The two ends of the oil pipe are connected with a first flange and a second flange correspondingly. A hydrate filtering disc is further arranged in the inner cavity of the oil pipe, arranged in the downstream inner cavity ofthe oil pipe in the mode of being perpendicular to the center axis of the oil pipe, and located downstream the bond-type vortex generators. According to the bond-type gas well opening slow-plugging device and the application method thereof, through the vortex generators at the front end of the oil pipe and the hydrate filtering disc at the rear end of the oil pipe, the phenomena of wellhead frozenblocking and well opening failure due to the fact that a flowmeter flowing channel downstream a gas well wellhead pipeline is plugged by hydrate particles in the well opening process can be relievedand prevented, the gas well opening success rate is increased, the gas well management and maintenance difficulty is reduced, labor and material resources are saved, and the bond-type gas well openingslow-plugging device and the application method thereof have broad application prospects in the field of gas field mining.

Description

Technical field [0001] The invention belongs to the technical field of natural gas exploitation, and in particular relates to a tie-type gas well opening and plugging retarding device and an application method thereof. Background technique [0002] In the case of a long shut-in time for a gas well in the medium and low pressure gas gathering mode, when the gas well is opened, the pressure of the wellhead Christmas tree will be higher than the pressure of the surface pipeline. It is not possible to connect the full diameter valve to the surface pipeline, but manual operation is required The wellhead needle valve performs throttling and pressure reduction so that the downstream pressure of the needle valve is lower than the design pressure of the wellhead surface pipeline. Due to the throttling and cooling phenomenon of the needle valve at the well head during the well opening process, part of the hydrate particles formed by the well opening will go down with the airflow, blocking ...

Claims

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Application Information

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IPC IPC(8): E21B33/06E21B34/02E21B41/00
CPCE21B33/06E21B34/02E21B41/00
Inventor 陈勇刘双全肖述琴杨旭东卫亚明白晓弘田伟汪雄雄李耀德赵彬彬
Owner PETROCHINA CO LTD
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