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井壁垮塌问题是一个长期困扰钻井工程的技术难题,在金龙地区三开井段中,井壁垮塌主要发生在砂泥岩地层,包括脆性泥岩井壁的坍塌剥落,砂岩地层的渗透垮塌,风化砂岩的井壁扩大和砂砾岩井壁失稳。本文从该区地层垮塌的机理分析入手,通过优选处理剂和试验评价,钾钙基聚磺体系防塌性能优化及现场维护进行了介绍,对信件后油田金龙井区三开井眼防塌具有现实指导意义。
The collapse of borehole wall is a technical problem that long plagued the drilling engineering. In the three open sections of the Jinlong area, the collapse of the borehole wall occurs mainly in sand-shale formations, including collapsing and collapse of the borehole wall of brittle mudstone, infiltration and collapse of sandstone formations, weathering of sandstone The wellbore enlargement and instability of glutenite wall. Based on the analysis of the mechanism of formation collapse in the area, this paper introduces the optimization of anti-collapse performance and on-site maintenance of potassium-calcium-based polysulfonate system through the optimization of treatment agent and test evaluation. Practical guidance.