安塞油田中高含水期油井重复压裂技术研究与应用

从2000年以来,以缝内转向压裂工艺为主的重复压裂技术已经成为安塞油田油井重复改造的主要措施,其有效率达94.3%,平均单井日增油达1.4 t以上,取得了较好的增产效果。近两年来,安塞油田部分油井进入了中高含水期开发阶段,通过对油井储层物性、见水特征、初期改造参数、剩余油分布及选井选层、压裂液选择和施工参数优化等方面进行研究,确定了适合安塞油田中高含水期油井重复压裂的工艺技术。通过12口井的现场应用,取得了明显的"控水增油"效果。

Study on refracturing technique and its application in oil well with medium-high water content at Ansai oilfield

Since 2000,the refracturing technology,mainly the in- ternal diversion fracturing,has already become the dominant measure to reclaim oil well at Ansai oilfield,with an effective rate up to 94.3%,and the average oil increase of a single well above 1.4 tons per day.In recent two years,partial oil wells are at the development phase of medium-high water. Through studies on the reservoir nature,the character of water content,the initial reclamation parameter,the distri- bution of residual oil,the oil well and horizon selection,the selection of fracturing fluid and the optimization of produc- tion parameters,a technology that is adaptive to the refra- curing of the oil well of medium-high water content at An- sai oilfield.The on-site application in twelve well shows that the effect of controlling water and increasing production is obtained.