ZX105井卡套管事故原因分析及处理工艺

张珍

doi:10.3969/j.issn.1001-5620.2018.03.014

ZX105井卡套管事故原因分析及处理工艺

doi: 10.3969/j.issn.1001-5620.2018.03.014

张珍

中石化西南石油工程公司钻井工程研究院, 四川德阳 618000

基金项目:

“十三五”国家科技重大专项“优快钻井工具及关键技术应用研究”（2016ZX05038006-004）。

详细信息

作者简介:
张珍,工程师,1980年生,现在主要从事钻井液技术的研究工作。电话13550633102;E-mail:zhenzhen0607@163.com。

中图分类号: TE258
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出版历程
- 收稿日期: 2018-01-13
- 刊出日期: 2018-05-30

Analyses of the Cause of Casing Sticking in Well ZX105 and the Techniques of Freeing the Sticking

ZHANG Zhen

Research Center of Drilling Engineering, Southwest Petroleum Engineering Co., Ltd., Sinopec, Deyang, Sichuan 618000

摘要

摘要: ZX105井是部署在四川盆地川西凹陷知新场构造的首口勘探水平井，目的层为下沙溪庙组，设计完钻井深为3 726 m（垂深为2 506 m），水平段长为1 001 m。该井二开下套管至井深2 847 m，坐吊卡接悬挂器后活动套管时遇卡。针对ZX105井下套管遇卡技术难题，通过卡套管原因分析，判断本次卡套管类型为压差黏附卡套管，并得出井身结构缺陷是卡套管的主要原因。分析表明，一开套管下深浅，二开下套管遇卡时套管已进入水平段214 m，上部套管没有足够的冲击重量使水平段套管移动，同时井底较高的正压差，是造成本次水平井卡套管的主要原因，由此形成了套管解卡处理思路。该井采用了降低钻井液密度、三次泡解卡剂、环空憋压等手段后，首次实现川西水平井套管解卡成功，为川西中江地区下沙溪庙目的层的开发提供了宝贵施工经验。
- 钻井液 /
- 水平井 /
- 知新场构造 /
- 下沙溪庙组 /
- 卡套管 /
- 解卡
Abstract: Well ZX105 is the first exploratory horizontal well drilled in Zhixinchang structure in western Sichuan. This well, targeted the lower Shaximiao formation, was designed to drill to measured depth of 3,726 m (TVD 2,506 m). The designed length of the horizontal section was 1,001 m. The casing for the second interval was run and got stuck at 2,847 m when running lift sub and casing hanger to move the casing string. It was believed, through analyses, that it was a pressure differential sticking, and deficiencies of the casing program was the main cause of the sticking. It was also believed that the depth at which the casing for the first interval was run was not enough, and the point at which the casing got stuck is 214 m into the horizontal section, the weight of the casing string in the upper section is not enough to push the casing inside the horizontal section to move forward. The high positive differential pressure at the bottom of the hole thus caused the casing string to get stuck. Based on the analyses, it was decided to lower the mud weight, soak the stuck point with pipe freeing solution, and pressurize the annular space. The stuck casing string finally got free with these measures. This is the first time the stuck pipe gets free in horizontal drilling in the west of Sichuan, and the practice has provided valuable experiences for the development of the target zone, the Lower Shaximiao formation in Zhongjian area, western Sichuan.
- Drilling fluid /
- Horizontal well /
- Zhixinchang structure /
- Lower Shaximiao formation /
- Casing sticking /
- Release of stuck pipe

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