第33卷第3期 2016年5月
钻井液与完井液
DRILLINGFLUID&COMPLETIONFLUID
doi: 10.3696/j.issn.1001-5620.2016.03.009
Vol.33 No.3 May2016
对苏里格水平井水平段防漏防塌措施的探讨
吴满祥1,2，牟杨琼杰3，高洁1,2
（1.低渗透油气田勘探开发国家工程实验室，西安710021；2.川庆钻探工程有限公司钻采工程技术研究院，西安710021；
3.川庆钻探工程有限公司钻井总公司，西安710021）
吴满祥等.对苏里格水平井水平段防漏防竭措施的探讨[].钻井液与完井液，2016，33（3)：46-50.
摘要以往苏里格气田水平井水平段钻遇泥岩，通过提高钻井液密度实现力学平衡保持井壁稳定、防止塌。目前苏里格水平井进入整体开发阶段，地层压力因采气降低，高密度钻进时易造成井蒲，堵蒲作业难度较大并且易引起托压或黏附卡钻。针对提高密度易引起井蒲的原因和特点，
提出了以提高封堵性、保持一定抑制性和活度、合理降低钻并液ECD
采用合理的流变性和工程措施配合的方式预防井漏。分析了水平段常见泥岩类型和钻井液性能要求，对发生并漏后的措施进行了探讨。提出了做好低密度钻井液的防工作是防漏，在水平段为砂岩或泥岩较稳定下，可以降低密度与排量配合恢复正常；水平段蒲失为压差性漏失，采用挤堵方式容易造成裂缝，与邻井串通而加重漏失；区别对待泥质砂岩、砂质泥岩、灰色泥岩和炭质泥岩，采取不同的钻井液性能的观点。
关键词气井水平井；井漏；泥岩
中图分类号：TE282
TE283
文献标识码：A
文章编号：1001-5620（2016)03-0046-05
Discussion on the Mud Loss and Borehole Wall Collapse Prevention in Horizontal Drilling in Sulige
Gas Field
WU Manxiang-, MOUYANG Qiongjie, GAO Jiel.-2
(1.National Key Laboratory of Low Permeability Oil Field Exploration and Development,Xi'an, Shaanxi 710021;
2.Drilling&ProductionTechnologyResearchInstituteofCCDC,Xian,Shaanxi710021;
3.CCDCDrillingCompany,Xi'an,Shaanxi710021)
Abstract Borehole stabilization previously in horizontal drilling in Sulige gas field has been realized through increase in mud weight. Presently, the development of the Sulige gas field has entered a new stage of overall development in which formation pressure has been depleted because of gas production. Mud losses caused by high density and difficulties in controlling severe mud losses often led to inability to exert WOB and differential pressure pipe sticking. To prevent mud losses caused by high mud weight, several things have to be done, for example, improve the sealing and plugging performance of the drilling fluid, maintain the inhibitive capacity and activity of the mud filtrates, reduce the ECD to a certain level, and improve the mud rheology and use good engincering practices, The types of the mudstones commonly found in the horizontal section are analyzed, and requirements on drilling fluid studied. Measures for controlling mud losses are discussed. It is presented that to prevent borehole wall collapse, the important thing is to avoid mud losses, If sandstones are drilled in the horizontal section, or, if the mudstones encountered in the horizontal section is stable, mud weigh and flow rate can be reasonably reduced. Mud losses in the horizontal section are generally losses caused by differential pressures, and squeezing LCM slurries may induce new fractures in the formations, hence aggravating mud losses even into adjacent wells. For different formation lithology, such as argillaceous sandstone, sandy mudstone, gray mudstone and carbonaceous mudstone, different mud properties shall be adopted.
Key words Horizontal gas well; Mud losses; Mudstone
近年来随着苏里格水平井整装开发，地层压力因采气而降低。以往水平段钻遇泥岩时，通过提高
钻井液密度实现力学平衡保持井壁稳定、防止期璟的手段容易造成漏失。因此从井漏原因和特点入手
第一作者简介：吴满祥，男，1981年生，工程师，2004年毕业于西南石油学院应用化学专业，现从事钻井液完井液
方面工作。电话（029）86594935；E-mail：gcywmx@163.com。万方数据