摘要
超大位移井井身结构复杂,为合理设计其井身结构,从垂直井井身结构设计的压力平衡原理出发,针对大斜度井段垂深变化小且裸眼井段很长、大斜度裸眼井段最容易在测深最大处被压裂的特点,通过计算钻井液的当量循环密度,研究了超大位移井大斜度裸眼井段的地层压力、破裂压力和环空压耗之间的关系,得出套管最大下深及允许最大环空压耗的计算公式。研究结果表明,在一定的地质条件下,超大位移井井身结构设计的重要可控因素是环空压耗。采用文中推导的公式分析一个超大位移井井身结构设计及当量循环密度监控的案例,验证了该公式的正确性,为大位移井的井身结构设计提供了理论依据。
Casing program design of mega-extended-reach wells is complex,and in order to design in reason its casing program,based on the principle of pressure balances in the casing program design in the vertical wells,the relationships among pore pressure,fracture pressure and annular pressure loss in the long open-hole section with high inclination in mega-extended-reach wells are discussed.The formulae are deduced for calculating the maximum depth of casing point and the maximum annular pressure loss permitted.The research shows that the most important and manageable factor is annular pressure loss.With the formulae deduced in this paper,the instance of the design of casing program and the management of ECD in a mega-extended-reach well is analysed.The method provides a theoretic gist for mega-extended-reach well.
出处
《石油钻采工艺》
CAS
CSCD
北大核心
2006年第1期13-14,28,共3页
Oil Drilling & Production Technology
基金
国家自然科学基金重点项目(50234030)
教育部"创新团队"项目(IRT0411)等资助
中国海洋石油深圳分公司项目
编号为Z2004SLSZ-109
关键词
超大位移井
井身结构
环空压耗
优化设计
mega-extended-reach well
casing program
annular pressure loss
optimizating design
