To formulate fluids with flowback water, produced water directly to improve the utilization rate of recycling and reduce the adsorption damage of slick water to reservoirs, a high salt tolerance and low adsorption drag reducer was designed and prepared by introducing polar cation fragments to enhance the non-covalent interactions between the chains. The drag reducer was characterized by IR and NMR. Friction resistance and viscosity tests were conducted to evaluate its salt resistance property. Static adsorption and dynamic adsorption retention tests were carried out to evaluate the damage of this reducer to shale reservoirs. The introduction of cation units into the molecular structure can weak the shielding effect of metal cations to some extent, so the drag reducer can keep a stable molecular structure and good resistant reducing performance under high salinity. The enhancement of non-covalent interaction between chains decreased the free polarity sites, further reduced the possibility of hydrogen bonding between drag reducer molecules and shale. In high salinity condition, both the adsorption capacity of the drag reducer on the shale surface and the average damage rate to the core permeability are low. Compared with the conventional salt-tolerant system, the overall liquid cost was reduced by 17% and the production per well increased by 44%. The application of this slick water system has achieved remarkable results.

为了用回水配制流体，直接利用采出水提高循环利用率，减少浮油对储层的吸附破坏，设计并制备了高耐盐性和低吸附减阻剂，并通过引入极性阳离子片段来增强非盐分。 -链之间的共价相互作用。减阻剂通过IR和NMR表征。进行了耐磨性和粘度测试以评估其耐盐性。进行了静态吸附和动态吸附保留测试，以评估该还原剂对页岩储层的损害。在分子结构中引入阳离子单元会在一定程度上削弱金属阳离子的屏蔽作用，因此减阻剂可以在高盐度下保持稳定的分子结构和良好的抗还原性能。链之间非共价相互作用的增强减少了自由极性位，进一步降低了减阻剂分子与页岩之间氢键的可能性。在高盐度条件下，减阻剂在页岩表面的吸附能力和对岩心渗透率的平均破坏率均较低。与传统的耐盐系统相比，液体总成本降低了17％，每口井的产量提高了44％。该光滑水系统的应用取得了显著成果。进一步降低了减阻剂分子和页岩之间氢键的可能性。在高盐度条件下，减阻剂在页岩表面的吸附能力和对岩心渗透率的平均破坏率均较低。与传统的耐盐系统相比，液体总成本降低了17％，每口井的产量提高了44％。该光滑水系统的应用取得了显著成果。进一步降低了减阻剂分子和页岩之间氢键的可能性。在高盐度条件下，减阻剂在页岩表面的吸附能力和对岩心渗透率的平均破坏率均较低。与传统的耐盐系统相比，液体总成本降低了17％，每口井的产量提高了44％。该光滑水系统的应用取得了显著成果。