池27井区治水效果分析及川东石炭系气藏治水建议

EFFICTIVENESS ANALYSIS OF DRAINAGE WATER IN WELL CHI 27 AND RESOLVENT OF BOUNDARY WATER INVASION IN CARBONIF- EROUS RESERVOIRS IN EAST SICHUAN

池39井是大池干气田吊钟坝高点的一口高产气井,由于受到边水侵入的影响,严重制约了气藏的开发。从1997年开始实施“池27井区排水采气工程”,工程利用池39井和池27井相互连通,从边水区的水井池27井主动排水泻压,抑制水侵规模,降低水侵程度,从而恢复池39井的产能。工程在实施初期取得了一些有利的变化趋势,但因机抽排水力度不够而未达到预期目的,因此建议改机抽排水为电潜泵排水,加大排水力度,恢复池39井产能。川东石炭系气藏多数存在边水,其侵入方式分2种:一种是沿高渗区突进;一种是沿中低渗区渐进。对于沿高渗区突进的水侵治水初步意见为排水采气;中低渗区渐进水侵治水采用控水采气。

Well Chi 39 is one of high - yield wells in Dachigan gas field. Due to invasion of boundary water, both development of reservoir and output of this well are restricted. Well Chi - 27 has been carried out the project of gas producing by water drainage since 1997 to recover productivity well Chi - 39. Most carboniferous reservoirs have boundary water in east Sichuan. There are two ways of water invasion, one is abrupt invasion a-long high permeability area, the other is gradual invasion along lower - medium permeability area. For the first invasion , the resolvent is gas producing by water drainage. For the second one , the resolvent is gas producing by restricion of water.