第38参第5期 2016年9月
石油钻采工艺
OIL DRILLING & PRODUCTION TECHNOLOGY
文章编号：10007393(2016)05-0568-05
DOI: 10.13639/j.odpt.2016.05.005
渤中沙河街水平井安全钻井及储层保护
许杰何瑞兵刘小刚祝国伟
中海石油(中国)有限公司天津分公司海洋石油高效开发国家重点实验室
Vol.38 No.5 Sept. 2016
引用格式：许杰，何瑞兵，刘小刚，祝国伟.激中沙河街水平并安全钻并及储层保护[J］.石油钻采工艺，2016,385)：568-572
摘要：针对下第三系储层开发的水平并，依靠现有的弱装胶钻井液技术无法满足安全钻并和储层保护的要求，根据沙河街地层特点，通过改变配方中甲酸钾与KC1的加放比例，降低钻并液活度，促使储层段钻并液与沙河街地层活度相匹配。利用甲酸师离子压缩轨土胶体题粒双电层的能力，提高了对泥页岩的抑制性；储层保护方面采用逐级拟合填充技术，即通过优选 CaCO,粒径的大小与地层孔哦粒径相匹配达到封凿作用；完并期间使用隐形酸作为破胶剂，达到解措效果，从而解决沙河街地层易发生并壁失稳和深部地层储层保护难度大等技术难题。该技术在BZ34-7-A2H并中成功应用，实现了安全钻井与储层保护的目的。
关键词：渤海油田；沙河街组；水平井；钻井液；井壁稳定；封堵；解堵；双电层；隐形酸
中图分类号：TE243
文献标识码：B
Safedrillingofhorizontalwellsand reservoirprotectionin
ShahejieFormation, Bozhong Block XU Jie, HE Ruibing,LIU Xiaogang,ZHU Guowei
Stare Key Laboratory of Ofshore Oil Exploifation, Tianjin Branch Company, China Narional Ofshore Oil Co. Ltd., Tianjin 300452, Chind
Citation: XU Jie, HE Ruibing, LIU Xiaogang, ZHU Guowei. Safe drilling of horizontal wells and reservoir protection in Shahejic Formation, Bozhong Block [J] . Oil Drilling & Production Technology, 2016, 38(5): 568-572
Abstract: For horizontal wells drilled for development of Tertiary reservoirs, conventional weak gel drilling fluid may not fully satisfy all demands for drilling safety and reservoir protection. With consideration of specific properties of Shahejie Formation, propor-tions of potassium formate and KCl used in the formula have been modified to reduce the activity of the drilling fluid with the intent to match the drilling fluid used in reservoir formation with the activity of the Shahejie Formation. By utilizing capacities of potassium formate ions in compression of double electric layers in clay gel particles, inhibition performances to the mud shale can be enhanced effectively; To protect reservoir formations, step-by-step matching and filling have been adopted by selecting CaCO, grains with optimal sizes to achieve perfect match with pore diameters in reservoir formation. Duimng completion, recessive acid can be used as gel breaker to obtain desirable unplugging performances and effectively remove problems related to sidewall instability and proper protection of deep formation in the Shahejie Formation. The innovative technique has been applied successfully in Well BZ34-7-A2H to achieve goals in safe drilling and reservoir protection.
Key words: Bohai Oilfield; Shahejie Formation; horizontal well; drilling fluid system; sidewall stability; plugging; plugging re moval; double electric layers; recessive acid
渤海油田的开发逐渐转向深层，以往的沙河街储层大部分以定向井开发，开发效果较好。但对于
储量规模较小，储层分布较为集中的储层，采用水平井开发，其效果更佳。但不可避免的是在沙河街储
基金项目：国家科技重大专项“大型油气田与煤层气开发"示范工程（端号：2016ZX05058)。
第一作者：许杰（1980-)，现以事钻究并技术管理和科研工作，钻究并总师兼工程技术研究所所长，高级工程师。通讯地址：(300452)天津
培活用表路1号609 信箱。联系电话：022-25807669。E-mail；xujie@enooc.com.cn
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