摘要
针对库车坳陷克拉苏构造带克深24构造勘探阶段面临的井位部署、钻井提速和完井提产问题,从地质工程一体化角度进行分析。井位部署阶段,预测控制构造的断裂活动性差,有利于油气保存;在地质预测基础上,根据地质力学研究明确了浅层高陡地层、砾石层、泥岩层、膏盐岩层和裂缝性砂岩层5类不同岩层的井壁稳定性,提出钻井液性能优化措施;在完井阶段,根据地质力学特征,制定合理的提产方式,并对改造层段、施工压力、射孔簇等进行优化。根据研究结果陆续上钻克深24井、克深241井等9口井,未发生较严重复杂现象,平均提速39%,创克拉苏构造带最快钻井纪录。完钻的5口井采用不同的方式改造,平均单井日产气量31×104m3,平均无阻流量170×104m3/d,勘探成功率和高产井比例均达到100%.在克深24构造勘探实践中,形成了地质工程一体化研究及应用流程,并融入到井位部署钻完井工程一体化中,成为解决复杂地质条件下生产难题的有效手段。
Aiming at well location deployment,drilling speed increasing and well-completion production improvement in the Structure KS24 of Kelasu tectonic belt in the piedmont area of Kuqa depression during exploration,an analysis on the three aspects is carried out from the perspective of geology-engineering integration.In the stage of well location deployment,it is predicted that the faults controlling the structure have good sealing and is conducive to oil and gas preservation.On the basis of geological prediction and geomechanical research,the borehole stabilities are identified for shallow high-steep interval,gravel interval,mudstone interval,gypsum interval and fractured sandstone interval,and measures for optimizing drilling fluid performance are proposed.In the well completion stage,according to the geomechanical characteristics,a reasonable production improvement mode is formulated,and the stimulated interval,operation pressure and perforation cluster are optimized.According to the research results,9 wells such as Well KS24 and Well KS241 etc.have been drilled successively and no abnormalities occur.The drilling speed is increased by 39%in average,which creates a drilling record in Kelasu tectonic belt.Different stimulation methods are adopted in the 5 drilled wells,the average gas well production is 31×10^4 m^3/d,the average open flow capacity is 170×10^4 m^3/d,and both the exploration success rate and high-yield well rate reach 100%.During the exploration practices in the Structure KS24,a procedure of geology-engineering integration study and its application has been established,and has been combined into well location deployment-drilling and engineering integration,which has become an effective mean to solve exploration and development problems under complex geological conditions.
作者
尹国庆
张辉
王海应
王志民
刘新宇
YIN Guoqing;ZHANG Hui;WANG Haiying;WANG Zhimin;LIU Xinyu(Research Institute of Exploration and Development,Tarim Oilfield Company,PetroChina,Korla,Xinjiang 841000,China)
出处
《新疆石油地质》
CAS
CSCD
北大核心
2019年第4期486-492,共7页
Xinjiang Petroleum Geology
基金
中国石油科技重大专项(2018E-1803)
关键词
库车坳陷
克拉苏构造带
克深24构造
地质工程一体化
高效勘探
Kuqa depression
Kelasu tectonic belt
Structure KS24
geology-engineering integration
efficient exploration
