富钙页岩油气压裂用酸性滑溜水体系

常规滑溜水防膨效果不理想，无溶蚀钙质功能，在非海相页岩储层压裂效果不理想，亟需开发一种集降阻、溶蚀、造缝、防膨及携砂一体的新型多功能滑溜水体系。本研究合成了一种新型耐酸型减阻剂，在酸中具有良好的增黏和稳定性能，优选了防膨和缓蚀双重功能缓蚀剂，大幅度提高体系防膨性能，加入黏土稳定剂和助排剂形成了多功能酸性滑溜水压裂体系。研究结果表明:该酸性滑溜水室内降阻率可达69%，防膨率大于90%，表面张力小于28 mN/m，腐蚀速率小于5 g·m-2/h，满足各项性能要求。经现场实验，表现出较好的降压降阻效果，在裂缝中起到了溶蚀扩缝降压作用，具有良好的推广应用前景。 

Study on Acidic Slick Water for Fracturing Calcium-rich Shale Gas and Oil

The result of fracturing nonMarine shale by conventional slick-water with poor anti-swelling effect and without dissolving calcium function is unsatisfactory. Therefore, it is urgent to develop a novel multifunctional slick-water system integrating drag reduction, dissolution, fracture, anti-swelling and sand carrying. In this study, a new type of acid-resistant drag reduction agent was synthesized, which has good viscosity-increasing and stable performance in acid. Corrosion inhibitor with the dual function was optimized to greatly improve the anti-swelling and corrosion mitigation. The multifunctional acidic slick-water was formed by adding clay stabilizer and the cleanup additive. The results show that the acidic slick-water with drag reduction rate up to 69%, anti-swelling rate higher than 90%, surface tension less than 28 mN/m, and the corrosion rate less than 5 g·m-2/h meets various performance requirements. After field test, it shows good effect of reducing pressure and resistance, and plays an important role in dissolving, expanding fracture and pressure reduction in fracturing. Thus, the acidic slick-water has good promoted application prospect.