无毒环保型高性能水基钻井液室内研究

发布时间：2018-10-09 08:56

【摘要】：由于油基钻井液存在使用成本高、环保处理难度大等弊端,使用水基钻井液替代油基钻井液已成为大势所趋。针对页岩地层对钻井液性能的要求,以无氯、无重金属离子、无黑色材料等环保指标为基本原则,优选了胺基聚醇和乳液大分子作为环保型高性能水基钻井液的包被抑制主剂,配合甲酸钾进一步提高体系的抑制性,并通过高效封堵剂提高体系对页岩地层纳微米孔缝的封堵能力,构建了无毒环保型高性能水基钻井液体系。性能评价结果表明,该钻井液在密度为1.22~2.18 g/cm3范围内均具有优良的流变性及滤失造壁性能,该体系静置24 h后上下密度差为0.03~0.06 g/cm3,沉降指数低于0.508,悬浮稳定性好,触变性高,钻井液样品API泥饼黏滞系数最低达到0.026 2,润滑性能好,并兼具较强的抑制性和抗岩屑污染性能,5.0%及8.0%英国评价土或古巴VDW**井岩屑污染前后的塑性黏度、动切力、静切力的变化率均控制在25%左右,能够满足不同压力系统页岩地层钻井的需要。
[Abstract]:Because of the disadvantages of oil based drilling fluid, such as high cost and difficulty in environmental protection treatment, it has become a general trend to replace oil based drilling fluid with water based drilling fluid. In order to meet the requirements of shale formation for drilling fluid performance, based on the basic principles of no chlorine, no heavy metal ions and no black materials, the amine polyol and emulsion macromolecules were selected as the encapsulation inhibitor of environmentally friendly high performance water-based drilling fluids. In combination with potassium formate to further improve the inhibition of the system, and through the high efficiency plugging agent to improve the plugging ability of the system to shale formation nanometer-meter pore fractures, a non-toxic and environment-friendly water-based drilling fluid system with high performance was constructed. The results of performance evaluation show that the drilling fluid has excellent rheological properties and filtration wall-making properties in the range of 1.22 ~ 2.18 g/cm3. The density difference of the system is 0.03 ~ 0.06 g / cm ~ (3), the sedimentation index is lower than 0.508, the suspension stability is good, and the thixotropy is high. The viscosity coefficient of API mud cake of drilling fluid sample is the lowest up to 0.026, which has good lubricity, strong inhibition and resistance to cuttings pollution of 5.0% and 8.0% in Britain to evaluate the plastic viscosity and dynamic shear force before and after cuttings contamination in soil or VDW** well in Cuba. The change rate of static shear force is about 25%, which can meet the requirement of shale formation drilling with different pressure system.
【作者单位】：中国石油集团长城钻探工程有限公司钻井液公司;
【基金】：中国石油集团长城钻探工程有限公司博士后基金项目“威远龙马溪地层水基钻井液高效封堵剂开发及体系研究”(2015B01)
【分类号】：TE254

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