环保型耐盐降阻剂的研制与应用

Development and Application of Environment-friendly Salt-tolerant Friction Reducer

刘 倩 管保山 刘玉婷 梁 利

LIU Qian GUAN Baoshan LIU Yuting LIANG Li

为实现高矿化度盐水直接配制滑溜水进行体积压裂，解决常规W/O反相乳液降阻剂存在的成本较高和环境污染问题，通过分散乳液聚合法，在聚合反应中引入极性亲水单体和耐盐阳离子单体，得到了一种环保型耐盐W/W分散乳液降阻剂PADD，分别考察了PADD的溶解性能、耐温性能、降阻性能以及对岩心的伤害情况，并报道了现场应用情况。研究表明，质量分数为0.1%的PADD在清水、40 g/L和 80 g/L的矿化水中均可以快速均匀分散，在高矿化度（80 g/L）条件下，PADD分子结构依然稳定；质量分数为0.1%的PADD溶液在80℃下老化72 h后的黏度保持率大于90%，在3种不同矿化度下质量分数0.1%的PADD溶液降阻率均在70%以上，且对岩心的伤害较小。以PADD为主剂采用返排液配制的耐高矿化度滑溜水已在威202H16平台成功应用。

In order to realize the direct preparation of slick-water with high salinity brine for volume fracturing，and to solve the high cost and environmental pollution problems of conventional W/O inverse emulsion friction reducer. An environmentally friendly salt-tolerant friction reducer PADD was prepared through introducing polar hydrophilic monomer and salt-tolerant cationic monomer into the polymer by emulsion dispersion polymerization method. The solubility，temperature resistance，resistance reduction performance and damage to the core of PADD were investigated，respectively，and the field application of PADD slick-water was mentioned. The results showed that PADD with mass fraction of 0.1% could be quickly and uniformly dispersed in clean water，40 g/L and 80 g/L mineralized water，respectively. Under the condition of high salinity（80 g/L），the molecular structure of PADD remained stable. The PADD solutions with mass fraction of 0.1% under three different salinities were aged for 72 h at 80℃，and the viscosity retention rate was greater than 90%，the drag reduction rate was above 70%，and there was less damage to the core. The high-salinity-resistant slick-water prepared with the flowback fluid using PADD as the main agent has been successfully applied in Wei 202H16.