Circulating reinjection well washing system and well washing method

Abstract

The invention provides a circulating reinjection well washing system and a well washing method, and belongs to the field of extraction control or adjustment systems. The system comprises a direct discharge system, a reinjection system and a screw pump, the end part of the screw pump is connected with an output header pipe through a four-way connecting piece; the direct drainage system comprises a produced water direct drainage pipeline, one end of the produced water direct drainage pipeline is communicated with the output header pipe, and the other end is communicated with the evaporation pond; the reinjection system comprises a reinjection water tank, a booster pump and a produced water in-tank pipeline, and the inlet end of the booster pump is communicated with the reinjection water tank through a first high-pressure pipeline; the outlet end is communicated with the four-way connecting piece through a second high-pressure pipeline; one end of the produced water in-tank pipeline is communicated with the output header pipe, and the other end is communicated with the reinjection water tank; one end of the overflow pipeline is communicated with the reinjection water tank, and the other end of the overflow pipeline is connected with the evaporation pond. The system and the method ensure the drainage and mining continuity in the middle and later periods of the coal-bed gas well and improve the gas production rate; the pump inspection period is short, and the cost caused by pump inspection is reduced.

Description

technical field [0001] The invention belongs to the technical field of drainage control or adjustment systems, and in particular relates to a circulation reinjection well flushing system and a well flushing method. Background technique [0002] Coalbed methane development includes two methods: underground gas drainage in coal mines and surface drilling. For a long time, the drainage equipment used in surface coalbed methane mining is mainly the extraction equipment for transplanting conventional oil and gas, and there are few special drainage equipment suitable for coalbed methane mining. . There are various designs of coalbed methane wells, including vertical wells, inclined wells, and horizontal wells, and horizontal wells are divided into "U" type and "L" type and other well types, because the gas production of horizontal wells is more than 10 times that of vertical wells , so large-scale development of horizontal wells has become a trend in oil and gas fields. Although ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a circulating reinjection well flushing system and well flushing method to at least solve the problem that the water volume gradually decreases in the middle and late stages of the current coalbed methane exploitation process, and the liquid supply capacity of the well cannot be insufficient, resulting in the failure of the screw pump to operate normally. The problem of accumulation of fly ash underground and increasing operating costs

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