微弱伤害瓜胶清洁压裂液性能评价及应用

Behavior evaluation and application of weak-damage guar gum clean fracturing fluid

常规的瓜胶压裂液体系对油藏伤害的主要因素是残渣大、伤害率高以及由体系配伍性不好造成的伤害。采用低用量瓜胶多核交联剂、多功能阻垢剂、选择性高分子断裂催化剂三种技术集成了微弱伤害瓜胶清洁压裂液体系,对其耐温耐剪切性能、破胶性能、岩心伤害及配伍性进行了研究。结果表明,该体系耐温耐剪切性能良好,破胶残渣为72 mg/L,对岩心的伤害率<10%,破胶液与地层水配伍性良好,并在陕北地区进行了现场应用。

The damage of conventional gum fracturing fluid system are residue,high damage rate and bad system compatibility. The weak-damage guar gum clean fracturing fluid system are integration by the three kinds of technology, including low dosage glue of multi-core crosslinker, multi-functional inhibitors and elective polymer fracture catalyst. The heat-resistant, gel breaking performance, core damage and compati-bility are studied. The results show that the system is heat resistance, the break glue residue is 72 mg/L and the harm of core rate is less than 10%. The formation water and gel breaking liquid have a good com-patibility, the system is applied in northern Shaanxi.