磷酸酯/Fe3+ 型油基冻胶压裂液性能研究

针对磷酸酯/Al3+ 交联的油基压裂液交联速度慢，交联剂溶解性慢、稳定性差和价格高等缺点，首次对磷酸酯/Fe3+ 交联的油基压裂液体系进行了研究。通过对铁交联剂体系的优化，筛选一种磷酸酯/Fe3+ 交联的新型交联剂体系，并对磷酸酯/Fe3+ 油基冻胶压裂液性能进行了评价。结果表明：采用30%Fe2(SO4)3+15% 二乙醇胺+55% 水制备的新型交联剂体系，直接与磷酸酯混合即可形成油基冻胶，其性能不受放置时间的影响，交联速度快，成胶性能好，10 min 就可达到最大黏度；压裂液的抗温抗剪切性能高，与常规铝交联剂体系比较，压裂液成胶速度提高了20 倍，压裂液的抗温能力由原来100 ℃提高到135 ℃，并且压裂液的破胶性和滤失性等性能均能达到压裂施工的要求。

Performance Research of Oil-based Gelled Fracture Fluid Based on thePhosphoric Acid Ester and Ferric Iron

Hydrocarbon gels are used in the low penetrate，low pressure and the water-sensitive formation fracturing. We makea study on a kind of new phosphate ester and ferric iron to hand over the oil-based fracturing liquid to fasten in this paper. Byoptimizing iron crosslinking agent，We choose a new crosslinking agent reacted with phosphate diester，and evaluate the performanceof phosphate diester/Fe3+ oil-based gelled fracturing fluid. The results display the new crosslink system（30%Fe2（SO4）3+15%Diethanolamine +55%H2O）functions stabily，and it crosslinks quickly with gels，with good gum function. The new fracturingfluid functions well in temperature resistance and shear resistance. Compared with conventional aluminum crosslinker，the new fracturing fluid is 20 times faster in gelation，and is able to resist a temperature of 135 ℃. Both the breaking and lossingof the new fracturing fluid meet the requirement of fracturing.