钻井液与完井液2018，Vol.35Issue(1)：61-65,5.DOI:10.3969/j.issn.1001-5620.2018.01.012
适用于鄂尔多斯盆地天环塌陷西翼的体膨胀堵漏工艺
A Bulk Expansion Pressure-bearing Lost Circulation Process Suitable for Use in the West Wing of Tianhuan Collapse in Ordos Basin
李志宏 1陈鹏伟 2高果成1
作者信息
- 1. 川庆钻探工程有限公司工程技术研究院,西安710018
- 2. 低渗透油气田勘探开发国家工程实验室,西安710018
- 折叠
摘要
Abstract
In the west wing of the Tianhuan Collapse in Ordos Basin,Changqing Oilfield,mud losses have often been encountered when drilling to the Luohe Formation and Liujiagou group,in which fractures (both vertical and horizontal) are very developed and formation water is active.Rates of mud losses resulting from pressure differential are in a range of 20-100 m3/h.Conventional methods seldom succeeded because of the difficulties in controlling this kind of mud losses.Many kinds of lost circulation material were tested in laboratory and a bulk expansion lost circulation material,HSW-1,was selected.In controlling mud losses,HSW-1 slurry was first spotted into the thief zone to form a pressure bearing barrier to protect the thief zone from being eroded by mud flow.Cement plug was then spotted into the thief zone protected by HSW-1 slurry to completely stop mud losses.HSW-1 when in contact with water will expand to 500-800 times of its original volume,and the pressure bearing capacity of the set HSW-1 slurry is 11 MPa at test pressure of 7 MPa.HSW-1 works normally at 120 ℃,and time for the HSW-1 to set is 2-6 min.A special tool has been developed for the targeted delivery ofHSW-1 to the place where HSW-1 is required because of its short set time,and success rate of mud loss control with HSW-1 can thus be increased.关键词
堵漏/漏失速率/投送工具/水泥塞/体膨胀承压堵漏剂Key words
Mud loss control/Rate of mud loss/Delivery tool/Cement plug/Bulk expansion pressure-bearing lost circulation material分类
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李志宏,陈鹏伟,高果成..适用于鄂尔多斯盆地天环塌陷西翼的体膨胀堵漏工艺[J].钻井液与完井液,2018,35(1):61-65,5.
