CB5-2井钻井液技术  

Drilling Fluid Technology for Well CB5-2

作　　者：吴满祥[1] 王海燕[2] 杨斌[1] 穆杨琼杰[1] 

机构地区：[1]川庆钻探工程有限公司工程技术研究院 [2]长庆油田公司第七采油厂

出　　处：《钻井液与完井液》2010年第1期79-81,共3页Drilling Fluid & Completion Fluid

摘　　要：根据长北气田整体开发方案的要求,采用双分支水平井开采方式,在一个井眼中钻2个分支各为2000m的双分支井。CB5-2井是长北区块的一口开发井,主要钻井目的是开发山西2气层,设计该井最低产量能达到80×10~4m^3/d,试产(井口压力为13MPa)产量为110×10~4m^3/d,投产后产量为120×10~4m^3/d。主要介绍用于CCB5-2井斜井段的强抑制性双钾盐聚合物钻井液和用于水平段的无固相低伤害暂堵钻井液。该井在二开大井斜段很好地解决了刘家沟组地层的严重漏失和煤层稳定问题;三开水平段所使用的无固相低伤害暂堵钻井液性能稳定、密度低、失水低、润滑防卡性能良好、暂堵效果显著,能有效地保护储层。Well CB5-2 is a bi-lateral development well(2,000 m in length of each lateral) in Block Changbei in Changqing. The objective of this well is to develop the Shanxi2 gas zone.The designed minimum daily production is 80×10~4 m^3/d,and the daily production in trial production period is(at wellhead pressure of 13 MPa) 110×10~4 m^3,while the daily production after this well is put into production will be 120×10~4 m^3/d.This paper discusses the application of a potassium based polymer drilling fluid in deviated section and a solids-free drilling fluid in horizontal section.Mud losses and hole instability in coalbed in the second interval(deviated section) were successfully solved.The solids-free,temporary plugging drilling fluid in the third interval had a stable property,a low density,a low fluid loss and a good lubricity.Reservoir protection was realized using this temporary plugging fluid.

关 键 词：双分支水平井 抑制性钻井液 无固相钻井液 临时性封堵 井眼稳定 防止地层损害 

分 类 号：TE254.3[石油与天然气工程—油气井工程]