煤层气U型井PE筛管完井泵送方案  

PE screen completion for U-shaped coal-bed methane wells with pumping method

作　　者：申瑞臣[1,2] 时文[1,2] 徐义 王开龙 蓝海峰 

机构地区：[1]中国石油勘探开发研究院研究生部,北京100083 [2]中国石油集团钻井工程技术研究院,北京100195

出　　处：《中国石油大学学报（自然科学版）》2012年第5期96-99,104,共5页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家科技重大专项(201105037-001)

摘　　要：为解决井壁坍塌堵塞流道问题,采用一种PE材质的连续筛管对煤层气U型井、多分支井的水平段进行完井。PE筛管主要通过井口注入装置由钻杆内注入,在下入一定长度后筛管会发生屈曲自锁,通过钻井液泵送筛管以有效解除屈曲锁紧状态,将筛管送至目的层位。筛管引导装置承压台肩的形状和尺寸对泵送效果起着关键作用。通过建立模型分析,推导出液流对台肩的冲击力公式,通过现场试验分析获取流阻系数的方法,并验证泵送方法送入筛管的能力。结果表明,液流对台肩的冲击力与液流和引导装置之间速度差的平方成正比,流阻系数取决于台肩同钻杆内壁之间的配合关系。In the U-shaped and multi-branched coal-bed methane （CBM） wells, sloughing which is likely to result in flow path blocking up, is one of the main limiting factors for CBM production. PE screen completion is a kind of method to resolve the problem. PE screen can support the well hole effectively, and reduce the damage caused b^y sloughing. PE screen is in- jected from the surface through pipes. With pushing force in one end and friction in the other end, buckling will occur when certain length of the PE screen injected. Pumping can relieve the buckling and lead the screen to preset position. The shape and size of pressure-bearing shoulder which is located at the front end of PE screen guiding unit are key factors for the pum- ping effect. With simplified model, the formula of fluid impact force was deduced. The method for obtaining coefficient of re- sistance was analyzed using field test, and the effect of pumping method was testified. The results show that the impact force is in proportion to the square of differential velocity between the drilling fluid and the PE screen guiding unit. The resistance coefficient is determined by the fit clearance between the shoulder and inner wall of the pipes.

关 键 词：煤层气 筛管完井 泵冲 流阻系数 

分 类 号：TE257[石油与天然气工程—油气井工程]