莺歌海盆地DF13-1气田井壁稳定性研究  

STUDY ON BOREHOLE STABILITY OF DF 13- 1 GAS FIELD IN YINGGEHAI BASIN

作　　者：黄凯文 张勇 许发宾 余意 李磊 闫传梁[2] 

机构地区：[1]中海石油(中国)有限公司湛江分公司 [2]中国石油大学(北京)油气资源与探测国家重点实验室

出　　处：《钻采工艺》2014年第5期19-21,8,共3页Drilling & Production Technology

基　　金：国家自然科学基金项目“泥页岩井壁坍塌的力学化学耦合研究”(编号:51174219)资助

摘　　要：DF13-1气田是高温高压气田,温度会对井壁稳定产生很大影响。传统的井壁稳定模型多未考虑温度的影响,为研究东方13-1气田的井壁稳定,在室内试验的基础上研究了该气田地层强度纵向分布规律,建立了考虑温度效应的井壁稳定分析模型,分析了温度对井壁稳定性的影响。指出在DF13-1气田钻井最大的挑战是井壁温度降低使破裂压力大幅降低,从而导致钻井液漏失,而钻井液密度过低又无法压住地层高压,准确预测地层破裂压力是DF13-1气田安全钻井的关键。在高温高压储层钻井时,考虑井壁温度变化的影响能提高安全钻井液密度窗口预测精度,对实际钻井具有指导意义。DF13- 1 is a HPHT gas field,the temperature will have a significant impact on wellbore stability,the traditional borehole stability models don't consider the effect of temperature. To study the wellbore stability of DF13- 1 gas field,the vertical distribution of formation strength was acquired based on an indoor experiment and the wellbore stability analysis model was established considering temperature effect. And the influence of temperature on wellbore stability in DF13- 1 gas field was analyzed by using the wellbore stability analysis model,the results showed that the reduction of borehole temperature made fracture pressure reduce significantly which would lead to the mud leakage. So,the accurate prediction of the fracture pressure is the key point to drill safely in DF13- 1 gas field. When drilling the HTHP reservoir,considering the influence of temperature change on borehole stability can improve the prediction accuracy of safety drilling fluid density window.

关 键 词：DF13-1气田 高温高压 井壁稳定 坍塌压力 破裂压力 

分 类 号：TE28[石油与天然气工程—油气井工程]