第33卷第4期 2016年7月
钻井液与完井液
DRILLINGFLUID&COMPLETIONFLUID
doi : 10.3696/j.issn.1001-5620.2016.04.017
Vol.33 No.4 July2016
塔里木山前区块超深井尾管塞流固井技术庄建山，宋元洪，高飞，孙万兴，陈大沧，孔哲，屈凌霄
（渤海钻探工程有限公司第一固井分公司，河北任丘062552）
庄建山等，塔里木山前区块超深井尾管塞流固井技术[1].钻井液与完井液，2016，33（4)：83-86
摘要克深905井是克深气田克深9井区中部的一口开发评价井，四开完钻需进行尾管固井，井深为7368.2m，井底静置温度为164℃，压力为180MPa，在钻进过程中易发生溢流、并漏等复杂情况，且环空间隙小，安全密度密口窄，为保证固井质量，防止井漏发生，全程采用塞流注替。根据现场水泥浆情况进行了水泥浆流变学设计和塞流顶替计算；优选了抗高温、抗盐高密度水泥蒙体系及与钻井液相容性好的冲洗型隔高液：设计了能够压稳地层密度为2.58g/cm的抗高温水泥浆；对现场泵压与返出量进行了实施监控。现场固井过程中未发生漏失，施工顺利，所封固井段的固井质量合格率为 99.2%，该并尾管塞流项替为中国首次在并深7368.2m的并使用。
关键词塞流注替；超深井；尾管固井；高密度水泥浆
中图分类号：TE256.6
文献标识码：A
文章编号：1001-5620（2016）03-0083-04
Plug Flow Liner Cementing Technology for Ultra Deep Well in Piedmont Tarim
ZHUANG Jianshan, SONG Yuanhong, GAO Fei, SUN Wanxing, CHEN Dacang, KONG Zhe, QU Lingxiao(No. CementingBranch of CNPC Bohai Drilling Engineering Company Limited, Renqiu,Hebei 062552)
Abstract The well Keshen-905 is an appraisal well drilled in the middle of the block Keshen-9, Keshen gas field, the fourth interval of which was going to be cemented with liner string. The well is 7,368.2 m in depth, and has bottom hole static temperature of 164 °C and pressure of 180 MPa. Well flow and mud losses have been encountered during drilling. Narrow annular space and small difference between the formation pressure and the pressure at which mud loss will occur all contribute to lost circulation during well cementing To ensure the quality of well cementing and prevent lost circulation, plug flow was adopted in the whole process of cementing. In field operations, cement rheology was designed and plugflow calculated. The cement slurry was designed to be used at high temperature and have salt contamination tolerance, and high density (2.58 g/cm/). A flushing spacer compatible with drilling fluid was used. Monitoring of pump pressure and the volume of cement slurry returmed showed that no lost circulation had ever happened during cementing. 99.2% of the hole cemented had job quality passed the requirements.
Key words Plug flow pumping and displacing; Ultra deep well; Liner cementing; High density cement slurry
克深905井是部署在塔单木盆地库车坳陷克拉苏构造带克深9区块上的一口开发评价井，位于新疆维吾尔自治区阿克苏地区拜城县境内，钻探目的是深化克深9区块构造、了解储层地质特征，评价克深9区块单井产能，为开发方案设计提供了依据。该井三开钻至古近系库姆格列木群盐层顶界，四开钻至库姆格列木群膏岩段底界，主要是封固膏岩层段，为五开钻进做好准备工作。四开采用尾管固井，用Φ241.3mm钻头钻至并深为7368.2m，悬挂器
位置在井深为6556.86m处，采用无接箍Φ206.38 mm厚壁套管下至井深为7368.2m，尾管悬挂封固段长为811.34m。该井四开使用油基钻井液，钻井时发生溢流、井涌等复杂情况，安全密度窗口窄[]，四开中途完钻时钻井液密度为2.49g/cm。为提高顶替效率，减少固井过程中井漏风险，通过理论分析和现场试验，现场使用了一套塞流注替固井技术及配套工艺，保证了该井的固井质量，为深井复杂井固井提供了宝贵经验。
第一作者简介：庄建山，高级工程师，男，1962年生，2006年获西南石油大学工程硕士学位，现任游海钻探第一固
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