摘要
为了降低冻胶压裂的施工费用,避免冻胶压裂液残渣对支撑裂缝的伤害,提高压裂井的增产功效。通过微乳液实验,聚合了一种新型页岩气压裂液降阻剂(简称降阻剂JZ-1)。对降阻剂JZ-1及以此为主要材料配制的活性水压裂液进行了性能研究实验,最终形成适合页岩气井开发的压裂液体系并投入现场应用。实验结果表明,降阻剂JZ-1溶胀速度快、黏度低,浓度为0.05%时,降阻率可达到76.5%,表面张力降至25 mN/m,页岩防膨率超过80%,对页岩地层伤害率较低,仅为8.33%。现场应用表明,新型降阻剂可有效降低摩阻,携砂性能优异,可在页岩气和其他低渗透致密油气藏的开发中推广应用。
The effectiveness of sand packed fracture is a basic guarantee for obtaining fracturing stimulation effect. To reduce construction cost of gel fracturing, avoid damage of gel fracturing fluid residues on prop fracture and increase production efficacy of fracturing wells, a new type of fracturing fluid drag reduction agent and active water fracturing fluid for shale gas development have been developed. Through microemulsion experiment, a new type of drag reduction agent is polymerized for active water fracturing fluid(hereinafter referred to as drag reduction agent JZ-1) in unconventional oil and gas reservoirs. Experimental results obtained by performance study on such new drag reduction agent and active water fracturing fluid show that the new drag reduction agent has fast swelling speed and low viscosity. Drag reduction rate can reach 76.5%, surface tension drops down to 25 mN/m, shale expansion rate exceeds 80% and shale formation damage is low to 8.33% when concentration of the agent was 0.05%. Field application results show that the drag reduction agent can effectively reduce friction, sand-carrying performance is excellent and can be used in shale gas and other low permeability tight reservoirs development.
出处
《天然气与石油》
2014年第1期72-76,12,共5页
Natural Gas and Oil
关键词
降阻剂
页岩气
活性水
压裂液
降低摩阻
评价
Drag reduction agent
Shale gas
Active water
Fracturing fluid
Friction decrease
Evaluation
