水性低伤害悬浮降阻剂体系的研究与应用

为了解决聚合物降阻剂粉末在现场应用中存在的水化时间长、溶解效果差等问题，同时避免现有现场用油性悬浮体系环保性差的缺陷，研发了一种以有机醇为溶剂的新型水性低伤害悬浮降阻剂体系，并对滑溜水体系的综合性能进行了室内和现场应用评价。结果表明，聚乙二醇200为最佳悬浮溶剂，当触变剂PR与CQ2720用量分别为1.5%时，体系具有最好的悬浮稳定性，在悬浮体系稳定中两者存在协同增效作用。增加0.5%助分散剂MR312后悬浮降阻剂体系常温静置30 d无沉降，体系黏度稳定在177 mPa·s。悬浮降阻剂体系遇水均匀分散，所配制滑溜水澄清透明，表观黏度可控，降阻率大于70%。在阳101H1-1井的压裂施工中降阻剂分散均匀无结块、起黏迅速，返排液易处理，环境伤害小，环保效果显著。 

Study and Application of a Low Damaging Drag Reducing Hydrophilic Suspension

A new low damaging hydrophilic suspension dissolvable in alcohol solvents was developed to solve the problems encountered in field application of polymer drag reducers such as long time of hydration and low solubility of the drag reducers, and problems encountered in using hydrophobic suspensions such as poor environmental friendliness. Laboratory and field evaluation of the overall performance of the slick water system was performed. The evaluation results show that the best solvent for the suspension is polyethylene glycol 200. When the concentrations of two thixotropic agents PR and CQ2720 were 1.5% respectively, the suspension has the best stability, and the two thixotropic agents have synergistic effect on stabilizing the suspension. When adding 0.5% dispersant MR312 into the suspension, the drag reducing suspension can stand for 30 d without any sedimentation, and the viscosity of the system remained at 177 mPa·s. The drag reducing suspension can be uniformly dispersed into water, and the slick water prepared with the suspension is clear and transparent. The viscosity of the slick water is adjustable and the rate of drag reduction is great than 70%. In the fracturing job performed on the well Yang-101H1-1, the drag reducer was uniformly dispersed into water, without agglomerating. The fracturing fluid became viscosified quickly and was easy to be flowed back, and it also showed significant environment protection effect.