摘要
地层孔隙压力、坍塌压力、破裂压力剖面是钻井井身结构优化设计及安全钻井液密度窗口确定的基础。利用测井方法计算三压力剖面,结合现场实测三压力数据,建立了GM区块地层三压力剖面;在充分认识三压力剖面特征基础上,开展了GM区块井身结构优化及安全钻井液密度窗口制定。研究提出,该区针对须二目的层的钻井具备三开制井身结构优化条件,同时指出前期钻井以地层孔隙压力为依据制定钻井液密度存在不合理处,推荐J3p-T3x5段地层采用微超地层坍塌压力设计钻井液密度较为合理,T3x4段以深地层采用微超地层孔隙压力设计钻井液密度较为合理。研究结果为GM区块钻井工程设计及现场施工提供了科学依据,经现场应用,提高了钻井效率、降低了钻井成本,取得良好经济效益。
Pore-, collapse-, and fracture-pressure profile(also called three-pressure profile) is the foundation to optimize a casing-program design and to determine a safe drilling-fluid density window. This three-pressure profile calculated by logging methods is combined with field pressure data to establish a three-pressure profile of GM block. Based on its characteristics, thecasing-program optimization and the safe density window determination are carried out. Results show that drilling of Xujiahe 2 Member of target layer qualifies for three hole-in casing program optimization. And it is unreasonable to determine drilling-fluid density according to pore pressure. For one section from J3 p to T3x5, micro-ultra collapse pressure is recommended; and for T3x4 section, micro-ultra pore pressure is recommended, respectively. The study provides a scientific basis for drilling design and site operation. Field application also indicates that the drilling efficiency has been improved and the drilling cost may be reduced, resulting in better economic benefits.
出处
《天然气勘探与开发》
2016年第1期57-59,62,共4页
Natural Gas Exploration and Development
基金
中国石化西南油气分公司科技项目(编号:GJ-238-1234)"高庙子-中江构造工程地质特征及钻完井对策研究"的部分研究成果
关键词
孔隙压力
坍塌压力
破裂压力
井身结构
安全钻井液密度
pore pressure
collapse pressure
fracture pressure
casing program
safe drilling-fluid density
