抗盐型滑溜水减阻剂的性能评价

Performance Evaluation of Slickwater Friction Reducer with Salt Tolerance

目前使用的大多数减阻剂抗盐能力无法满足滑溜水高矿化度配液用水的要求。为了获得可用高矿化度水配制的减阻剂,开展了疏水缔合聚合物抗盐型减阻剂GAF-RP的研究,评价了GAF-RP的溶解性、减阻性和抗盐能力等,研究了采用GAF-RP与增效辅剂GAF-2D和黏土稳定剂GAF-16配制的滑溜水体系的减阻性能、防膨性能及对岩心的伤害等,并在吉林某油田进行了现场应用。结果表明,GAF-RP减阻和抗盐效果均好于聚丙烯酰胺类减阻剂,GAF-RP溶解时间短,能在120 s内达到最大减阻率80%;抗盐达25×10~4mg/L,抗氯化钙1000 mg/L;GAF-RP配制的滑溜水体系具有较低的表面张力(27.1 mN/m)以及较高的防膨性能(防膨率大于80%),对岩心基质渗透率损害率小(小于5%);该滑溜水返排液可重复配液,返排液配制体系的减阻性能较好,减阻率为78.2%,压后返排率49.6%,日产油4.3 t,增产效果较好。

Most currently used friction reducer couldn＇ t tolerate high salinity of water that was used to prepare slickwater. In order to obtain the friction reducer that could be prepared by high salinity water, the research of hydrophobically associating polymer friction reducer GAF-RP with salt tolerance was carried out. The solubility, friction reducing property and salt tolerance of GAF-RP were evaluated. The friction reducing property, antiswelling property and damage to cores of slickwater system which was prepared by GAF-RP, synergist GAF-2D and clay stabilizer GAF-16 were studied, and the slickwater was applied on oilfield in Jilin province. The results showed that GAF-RP had better friction reducing property and salt tolerance than polyacrylamide based friction reducer. The dissolution time of GAF-RP was short and maximum friction reduction could be 80% within 120 s. GAF-RP could tolerate salinity up to 25 ×10^4 mg/L and CaCl2 content up to 1000 mg/L. Slickwater system prepared with GAF-RP had low surface tension （27.1 mN/m）, high antiswelling capacity （antiswelling rate〉 80%） and low damage （〈5%） to matrix permeability. Flowback fluid of the slickwater could be reused and the new system had desired friction reducing property. The friction reduction of system prepared with GAF-RP was 78.2% in the field, the flowback rate was 49.6% and daily oil output was 4.3 t, showing good production performance.