克拉美丽气田火成岩天然裂缝漏失压力模型  

Leakage Pressure Model of Natural Fractures in Igneous Rocks in Kelameili Gas Field

作　　者：杨虎 薛晓军 陈向辉 李秀彬 解俊昱 张伟[3] YANG Hu;XUE Xiaojun;CHEN Xianghui;LI Xiubin;XIE Junyu;ZHANG Wei(College of Petroleum,Karamay Campus,China University of Petroleum(Beijing),Karamay,Xinjiang 834000,China;Research Institute of Geology,Xibu Drilling Engineering Company Limited,CNPC,Karamay,Xinjiang 834000,China;Research Institute of Engineering Technology,Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang 834000,China)

机构地区：[1]中国石油大学(北京)克拉玛依校区石油学院,新疆克拉玛依834000 [2]中国石油西部钻探工程有限公司地质研究院,新疆克拉玛依834000 [3]中国石油新疆油田分公司工程技术研究院,新疆克拉玛依834000

出　　处：《新疆石油地质》2023年第1期93-99,共7页Xinjiang Petroleum Geology

基　　金：新疆维吾尔自治区自然科学基金(2022D01A163);中国石油重大工程试验项目(2020F-46)。

摘　　要：克拉美丽气田火成岩地层发育裂缝,裂缝性地层中存在天然裂缝与孔隙或孔洞的复合结构,钻井过程中漏失压力与地层破裂压力差异较大。根据不同井段火成岩的裂缝—孔隙状态、裂缝开合、连通及充填情况,开展压力漏失机理研究,构建不同裂缝状态的漏失压力模型,依据地层孔隙压力、地应力等参数绘制分层漏失压力剖面,确定克拉美丽气田火成岩天然裂缝的压力漏失规律。研究表明,火成岩的闭合裂缝压力漏失受地应力控制,开启裂缝压力漏失受地层孔隙压力和充填状态影响。结合典型井的钻井参数,分析裂缝漏失压力在不同井轨迹下的变化规律,确定钻井液安全密度窗口,实现安全钻井。Fractures are developed in the igneous strata of the Kelameili gas field. The composite structure consisting of natural fractures and pores or cavities in such fractured formations may result in a large difference between the leakage pressure and the formation fracture pressure during drilling. The leakage mechanism was investigated according to the fracture-pore occurrence and the fracture opening/closing,connection and filling of the igneous rocks in different well sections,the leakage pressure models under different fracture states were constructed,and the layered leakage pressure profile was plotted depending upon pore pressure,in-situ stress and other parameters,so as to determine the leakage law of natural fractures in the igneous rocks in the Kelameili gas field. The results show that the leakage pressure of closed fractures in the igneous rocks is controlled by in-situ stress,and the leakage pressure of open fractures is affected by formation pore pressure and filling state. Furthermore,combining with the drilling parameters from typical wells,the variation law of fracture leakage pressure under different well trajectories was analyzed,and the safe density window of drilling fluid was determined to ensure drilling safety.

关 键 词：克拉美丽气田 火成岩 裂缝结构 漏失压力模型 钻井液 密度窗口 

分 类 号：TE21[石油与天然气工程—油气井工程]