芬顿试剂/APS复合体系对羟丙基瓜尔胶压裂液的破胶及残渣降解作用

Oxidative Degradation of Water-Base Gum Fracturing Fluids by Fenton Reagant/APS

本文以芬顿试剂为压裂液残渣降解剂,在低温条件下,考察了芬顿试剂对原胶液的杀菌作用以及不同环境条件下芬顿试剂加量对压裂液破胶情况的影响,通过压裂破胶液粒径中值分布和支撑剂导流能力伤害实验,评价了芬顿试剂/APS破胶降解体系对压裂残渣的降解效果。实验结果表明:在30℃下,加0.2%芬顿试剂的原胶液放置72 h后黏度仍保持不变;将原胶液(pH≤7)与交联破胶体系(0.7%硼砂+0.3%APS+2%芬顿试剂+其他助剂)以体积比10∶1混合后制备的压裂液,3 h后的破胶液中的残渣含量较单独使用APS时降低了42 mg/L,固体颗粒含量下降近38%,破胶液对支撑剂导流能力的伤害下降近11.7%。

The Fenton reagent （FR）was introduced into water-base fracturing fluids and the effects of the FR on gel-breaking of waterbase fracturing fluids were discussed, and the effect of degradation of FR/APS system to the residue was evaluated by measurement of the size distribution of gel-breaking liquid and concentration of solid particles and the damage of the proppant conductivity. The results showed that the viscosity of glue solution changed little when adding 0.2% FR and keeping for 72 h. The fracture fluid was obtained by mixing glue solution and crosslinking-gel breaking system, composed of 0. 7% Borax, 0. 3% APS, 2% FR and other additives, Compared to using APS system, the residual polymeric materials of the gel-breaking liquid dropped by 42 mg/L, the content of solid particles dropped by 38%, The damage of proppant conductivity decreased by 11.7%.