S气田A区块水侵评价及开发调整效果分析

Evaluation on Water Invasion of A Block in S Gasfield and Its Development Adjustment Effect

S气田A区块为具有边底水的岩性构造气藏,整体投产后,出水气井逐渐增多,产水量大,影响了气藏的开发效果。为此,对A区块的水体体积、水侵量、水驱指数、水侵替换系数等参数进行了计算,计算结果表明气藏为强水驱气藏,水体规模较大。根据气井构造位置和水侵特征将A区块分为3个井组,其中北部井组产水量大和水气比高,中、南部井组水气比和产水量较稳定,针对各井组特点,制定了相应的"控、带、排"开发对策。整体治水方针实施后区块开发取得较好效果,产气量和产水量保持稳定。

A block,S gasfield,is the lithological-structural gas reservoir with edge and bottom water.After the whole production,some problems emerge,such as more and more gas wells with water even large amount of water production,severely affecting a development effect.We calculated some parameters,including waterbody volume,water influx,water flooding index,and water invasion replacement coefficient.Results show that this gas reservoir is strong waterflooding one with extensive waterbody.Moreover,based on well structural and position as well as water-invasion features,the block can be subdivided into three well groups,in which one located in north part is characterized by plenty of water and high watergas ratio whereas relatively stable ratio and water production for other gas groups in central and north parts.So,some development countermeasures on water control,exploitation with water,and expulse,have been made.Consequently,the better development effect was obtained,and both gas and water production also kept stable.