石油钻采工艺2016，Vol.38Issue(5)：568-572,5.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
Safe drilling of horizontal wells and reservoir protection in Shahejie Formation, Bozhong Block
摘要
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 CaCO3 grains with optimal sizes to achieve perfect match with pore diameters in reservoir formation. Duirng 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.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Key words
Bohai Oilfield/Shahejie Formation/horizontal well/drilling fluid system/sidewall stability/plugging/plugging re-moval/double electric layers/recessive acid分类
能源科技引用本文复制引用
许杰,何瑞兵,刘小刚,祝国伟..渤中沙河街水平井安全钻井及储层保护[J].石油钻采工艺,2016,38(5):568-572,5.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（编号2016ZX05058）。 （）
