体积压裂多因素耦合套变机理研究  

RESEARCH ON CASING DEFORMATION BY COUPLED MULTIPLE FACTORS DURING VOLUMETRIC FRACTURING IN SHALE GAS WELLS

作　　者：董文涛 申瑞臣[3] 乔磊 付利 张弘 

机构地区：[1]大连理工大学盘锦产业技术研究院 [2]中国石油勘探开发研究院 [3]中国石油集团钻井工程技术研究院

出　　处：《钻采工艺》2017年第6期35-37,共3页Drilling & Production Technology

基　　金：中石油集团公司项目"页岩气钻采工程现场试验-浙江油田昭通示范区页岩气钻采工程技术现场试验"(2014F-4702-05)

摘　　要：长宁-威远页岩气示范区开发中,部分页岩气井体积压裂增产改造工中发生套变,直接影响了页岩气井单井产量。文章通过页岩气井体积压裂中井筒降温、固井水泥环虚空、环空流体收缩、拉-弯应力耦合及上述四种问题之间耦合关系的研究,建立了以井筒降温和水泥环虚空为核心页岩气井体积压裂多因素耦合套变机理。研究认为,体积压裂中井筒降温和水泥环虚空共同作用是导致环空流体收缩及拉-弯应力耦合的必要条件。其中,井筒降温是引发环空流体收缩、拉-弯耦合应力的先导条件,而固井水泥环虚空使得环空流体收缩和拉-弯应力耦合最终得以产生。最后,文章提出规避页岩气井体积压裂中套管变形的相关措施。During shale gas development at ChangningWeiyuan demonstration area,there occurred casing deformation when doing volumetric fracturing in some shale gas wells,directly reducing the single-well production rate. Study has been made on borehole cooling,cement sheath voids,annulus fluid contraction,tension-bending coupling stress and the relationships in between,and the multi-factor coupling mechanism of casing deformation is set up,the borehole temperature decrease and cement sheath voids been taken as the core. The study indicates that wellbore temperature decrease and cement voids are necessary conditions for annulus fluid contraction and tension-bending coupling stress. The wellbore temperature decrease is the forerunning condition for annulus fluid contraction and tension-bending coupling stress,while the cement voids ultimately make possible the annulus fluid contraction and tension-bending coupling stress. Based on these study results,in this paper measures to avoid casing deformation in shale gas wells during volume fracturing are put forward.

关 键 词：套变 体积压裂 页岩气 机理研究 

分 类 号：TE377[石油与天然气工程—油气田开发工程]