斜井近井裂缝扩展机理及压裂工艺  

Mechanism of Fracture Extension Near Borehole Wall in Deviated Well and Fracturing Technology

作　　者：韩东[1] 李良川[1] 吴均[1] 黄坚毅[1] 程谟骥[1] 

机构地区：[1]中国石油冀东油田分公司钻采工艺研究院,河北唐山063004

出　　处：《钻井液与完井液》2016年第3期93-97,共5页Drilling Fluid & Completion Fluid

基　　金：国家科技重大专项"渤海湾盆地黄骅坳陷滩海开发技术示范工程"(2011ZX05050)

摘　　要：随着井斜增大,实施压裂措施的难度不断增大,压裂时表现出砂比低、压力高、中后期加砂困难等现象,压裂效果很难达到设计要求。通过分析认为,加砂难度大的主要原因是井斜增大所致。利用大尺寸真三轴模拟实验系统,实验了在不同井层条件下的裂缝扩展形态,结合现场压裂井情况分析,明确了南堡A断块斜井加砂困难的主要原因。通过制定相应的压裂技术对策,现场实施压裂的成功率明显提高,砂比最高可从18%提高至40%,取得较好效果。With an increase in well angle, difficulties in fracturing the well is also increasing. The problems encountered in fracturing high well angle wells are low sand concentration, higher pressure, and difficulties in adding proppants into the fracturing fluid in mid- and later-stage of the fracturing job. The fracturing jobs most often fail the design. It has been understood that the main reason for the difficulties in adding proppants is the deviation of the well, Using a large size true tri-axial simulator, the extension of fractures at different downhole conditions were studied. And combining the test results with field operations, the main reason of difficulties in adding proppants into fracturing fluid in mid- or later-stage of fracturing in the deviated wells in the A-fault in Nanpu can be ascertained. Measures to deal with the difficulties have been established, and field operations have been successful, because the concentration of proppants has been increased from 18% to 40%.

关 键 词：压裂 斜井 裂缝扩展机理 对策 

分 类 号：TE357[石油与天然气工程—油气田开发工程]