It is necessary to check the pump to restore the normal production of the gas well after the abnormal occurrences of coal powder stuck pump and sand buried pipe column.The phenomenon of sand and pulverized coal in the multi-thin coal seam in Zhijin block is serious,which greatly affects the stable discharge and production of coalbed methane Wells and reduces the productivity of gas Wells.Based on 14 pump inspection Wells in Zhijin coalbed methane,this study analyzed the reasons for pump inspection,and summarized the influence mechanism of sand and pulverized coal production leading to the blockage of Waer ball seat and rod offset wear.Finally,this study carried out the optimization design of the downhole pipe string structure for sand and pulverized coal prevention in coalbed methane Wells.By using the principle of"screen isolation+gravity differentiation",the secondary sand control process was realized,which alleviated the problems of sand buried pipe string and pulverized coal stuck pump,and greatly extended the pump inspection cycle of gas Wells.The field practice results proved the effectiveness of this design.
关键词
煤层气排采/修井检泵/防砂防煤粉工艺
Key words
Coal bed gas extraction/Workover inspection pump/Sand and pulverized coal control technology
维普
万方数据