沙坪场石炭系气藏合理排水强度论证

RESEARCH ON REASONABLY DRAINED STRENGTH IN CARBONIFEROUS GAS RESERVOIR SHANGCHANG OF EAST SICHUAN BASIN

随着四川盆地东部石炭系气藏的全面、快速开发,部分石炭系气藏和气井开始产水,严重影响了石炭系气藏的正常生产和整体开发效益,因此,加强四川盆地东部地区石炭系气藏的治水工作已经迫在眉睫。文中以沙坪场石炭系气藏为研究对象,在利用大量静动态资料分析气藏的地质特征和动态特征的基础上,深入分析气藏天东90井出水特征,在地质机理上对出水原因取得了一定的认识。通过建立气藏合理的地质模型,利用气藏数值模拟技术对气藏水侵机理进行了研究,并进一步对气藏水侵强度及水侵对气藏造成的危害程度进行了早期预测和分析。通过气藏不同排水强度的分析论证,确定气藏合理排水强度为日排水量200m3/d～300m3/d左右。

With the all-round and rapid development of Carboniferous gas reservoirs in East Sichuan Basin,some Carboniferous reservoirs and wells become to yield water resulting in a serious influence on normal production and overall benefits.So,strengthening water control in Carboniferous gas reservoirs of East Sichuan Basin is extremely urgent.Taking Tiandong 90 gas well in Shapingchang Carboniferous gas reservoir as an example,the water-producing characteristics have been further studied based on geologic and dynamic features analyzed by large amount of both dynamic and static data.Moreover,the water-producing reason is identified in terms of geologic mechanism.For the gas reservoir,we build up a reasonable geologic model and study its water-invasion mechanism on the basis of numerical simulation,and further have an early prediction and analyze both water-invasion strength and water-invasion damage extension.According to the analysis on different drained strength,the reasonable strength is confirmed by 200 to 300 m3/d.