叔胺型清洁压裂液体系的制备与性能评价.

Aiming at the problem that cationic surfactant fracturing fluid adsorbs in the formation and causes secondary damage to the reservoir, a long-chain tertiary amine（hereinafter referred to as OADA） was synthesized in the laboratory using oil diamine as raw material and Eschweiler-Clarke reaction.OADA was used as thickening agent and acetic acid as assistant.The effects of the amount of potassium chloride and the molar ratio of the main agent to acetic acid on the viscosity of the system were studied.The performance indexes of OADA clean fracturing fluid system, such as temperature resistance, shear resistance, viscoelasticity and suspended sand, were investigated.By scanning the frequency and stress of the system at room temperature, it is found that the system is mainly elastic.The system still has a viscosity of more than 25 mPa·s when it is continuously sheared at 100 ℃ and 170 s-1 for 1 h.The gel breaker has low viscosity and surface interfacial tension, and the damage rate to the core is only 5.82%,it has low damage characteristics and good compatibility with formation water. [ABSTRACT FROM AUTHOR]