套损后注水井浅层高压区预测

Prediction of shallow high-pressure region for injection well after casing damage

李士斌 任伟 张立刚 柴庆 王运涛2

东北石油大学提高油气采收率教育部重点实验室，黑龙江 大庆 163318 中国石油大庆油田有限责任公司采油工程研究院，黑龙江，大庆 163000

MOE Key Laboratory of Enhanced Oil Recovery, Northeast Petroleum University, Daqing 163318, China Research Institute of Oil Production Engineering, Daqing Oilfield Co. Ltd., PetroChina, Daqing 163000, China

注入水沿套损部位进入地层，在井壁附近易形成一个异常高压区。异常高压区一旦形成，对后续钻井会造成极大危害。文中在分析浅层高压区形成机理及危害的基础上，利用有限元模拟技术进行计算模拟，预测独立砂体、断层遮挡2种类型高压区的范围和压力大小随时间变化情况，并分析钻关井泄压方法的效果，在南二区高173-152井区、西二断块高429-27井区、杏12区3个区进行实际应用发现，预测结果与实际应用符合率达85%以上，泄压后固井优质率达78.4%，经济效益较好。

Injected water into formation along the position damaged by casing will form an abnormal high-pressure region, which is harmful for the subsequent drilling. Based on fully analysis of the formation mechanism and harm about abnormal high-pressure region and using finite element simulation techniques, this paper predicts the pressure change of abnormal high-pressure region with time for individual sand body and fault screened, and analyzes the effect of pressure relief. Applications in South 2 Gao 173-152, West 2 Fault Block Gao 429-27 and Xing 12 well areas show that the coincidence rate is more than 85% and the cementing perfection rate is 78.4%, getting significant economic benefits.

10.6056/dkyqt201304021