胍胶自增稠支撑剂性能及其储层伤害性评价

Performance Evaluation of Guanidine Gum Self-suspension Proppant and Its Reservoir Damage Assessment

郐婧文 卢祥国 曹伟佳 陈 清 鲍文博

KUAI Jingwen LU Xiangguo CAO Weijia CHEN Qing BAO Wenbo

为大幅减少现有压裂液工艺配制和运输费用，实现在线配制携砂液，本文采用将胍胶细粉黏附在支撑剂颗粒外表面的方法制作了新型自增稠支撑剂，并以高温高矿化度油藏环境为实验条件，开展了该自增稠支撑剂性能评价及储层伤害性实验。研究表明，在温度高于80℃的情况下，与SZ36-1油田注入水、长庆油田注入水、大庆油田污水和大庆油田清水相比，由矿化度最高的大港油田注入水配制的胍胶增稠剂溶液增黏性最好，视黏度最高，储能模量最大，携砂能力最强。当砂比大于30%后，用大港油田注入水配制自增稠支撑剂悬浮时间小于20 s，沉降时间大于4 h。当自增稠支撑剂破胶剂加量为0.03%~5.0%时，破胶时间为14~2.5h。恒速实验中，随着岩心渗透率增大，滤失量逐渐升高，伤害率逐渐降低。恒压实验中，随着滤失压差的增大，滤失量逐渐增加，伤害率逐渐增加。该胍胶自增稠支撑剂可满足高温油藏压裂施工需求，具有广阔的应用前景。图5表6参20

In order to significantly reduce the preparation and transportation costs of existing fracturing fluid，and realize online preparation of sand-carrying fluid，a new type of self-thickening proppant was prepared by attaching guanidine gum powder onto the surface of proppant particles. Performance evaluation and reservoir damage experiments of the self-thickening proppant were carried out under experimental conditions of high-temperature and high-salinity reservoir environment. The results showed that under conditions of 80℃，compared with injection water of SZ36-1 oilfield，injection water of Changqing oilfield，sewage of Daqing oilfield and fresh water of Daqing oilfield，guanidine gum solution prepared by injection water of Dagang oilfield with the highest salinity had the best gel forming effect，the highest apparent viscosity，the largest energy storage modulus and the strongest sand carrying capacity. When the sand ratio was greater than 30%，the suspension time of the self-thickening proppant was less than 20 s and the settling time was greater than 4 h. When the dosage of the self-thickening proppant was 0.03%—5.0%，the gel breaking time was 14—2.5 h. In the constant velocity experiment，with the increase of core permeability，the filtration loss increased gradually and the damage rate decreased gradually. In the constant pressure experiment，with the increase of the filtration pressure difference，the filtration amount and the injury rate gradually increased. The self-thickening proppant could meet the need of fracturing construction in high-temperature and high-salinity reservoir，and had a a broad application prospect.

10.19346/j.cnki.1000-4092.2019.02.006