Filtering device and filtering method for hydrates of surface pipeline of well site of natural gas well

Abstract

The invention disclose a filtering device and a filtering method for hydrates of a surface pipeline of a well site of a natural gas well and belongs to the technical field of natural gas extraction. The filtering device for hydrates of the surface pipeline of the well site of the natural gas well comprises a gas inlet oil pipe, a middle oil pipe, a lower oil pipe, a front end vortex generating part, a middle end primary filter plate and a back end hydrate filter part. The tail end of the gas inlet oil pipe communicates to one end of the middle oil pipe perpendicularly while the other end of the middle oil pipe is connected to the lower oil pipe by a flange; the front end vortex generating part and the middle end primary filter plate are separately located at two ends of the middle oil pipe, and the front end vortex generating part is perpendicular to a gas inlet direction of the gas inlet oil pipe; and the back end hydrate filter part is located at the tail end of the lower oil pipe. The device and the filter method can be used for alleviating freezing and blocking condition of the surface pipeline when the gas well is opened, so that the gas well opening success rate is improved and the management and maintenance difficulty of the gas well is reduced.

Description

technical field [0001] The invention relates to the technical field of natural gas exploitation, in particular to a natural gas well site surface pipeline hydrate filtering device and filtering method. Background technique [0002] The Sulige gas field belongs to the medium-low pressure gas gathering mode. When the gas well is shut down and restarted, when the pressure recovers to a high level, it is necessary to manually operate the manual needle valve at the wellhead to throttle and depressurize the well to avoid exceeding the design pressure of the surface pipeline. . Therefore, throttling and cooling will inevitably occur during the well opening process. When the temperature and pressure downstream of the needle valve meet the conditions for generating hydrate during the well opening process, hydrate will form and grow in the surface pipeline at the wellhead. [0003] During the needle valve throttling and opening process, the gas flow in the pipeline will blow some of...

AI Technical Summary

Problems solved by technology

At present, in the process of opening the well, if there is freezing and blocking during the opening of the well, it can only be solved by injecting alcohol at the wellhead after the freezing and blocking occurs, or waiting for a period of time to wait for the hydrate to melt on its own, and then restarting the well repeatedly. Try to solve it, which increases the difficulty of gas well management and maintenance and consumes manpower and material resources

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