“水质调节-絮凝-O3氧化”工艺处理胍胶压裂返排液及回用技术

Treatment and Reuse of Guar Gum Fracturing Flow-back Fluid Using the Technology of “Water Quality Regulation-flocculation-ozone Oxidation”

基于对延长油田某油井的胍胶压裂返排液的水质特性分析,采用“水质调节-絮凝-O3氧化”工艺对该压裂返排液进行处理,通过实验探索各工艺参数对处理效果的影响,并考察了处理后返排液回配滑溜水压裂液的性能。先将压裂返排液的pH值调至9.0,然后加入800mg/L絮凝剂IF-A和1.0mg/L助凝剂FA-B,再在通臭氧量30mL/min处理500mL返排液的情形下通气处理40min。处理后水质呈无色、清澈透明状,SS含量小于3.00mg/L,Fe离子含量0.5mg/L以下,黏度降至1.28mPa·s,细菌含量低。用处理液回配滑溜水压裂液的各项性能与用自来水配制的滑溜水压裂液性能相近,符合DB.61/T575-2013《压裂用滑溜水体系》标准,满足滑溜水压裂液配制用水要求。

Based on the analysis of the water quality characteristics of the guar gum fracturing flow-back fluid(GGFFBF)from a certain oil well in Yanchang oilfield,the process of water quality regulation-flocculation-O3 oxidation was carried out to treat the GGFFBF and the treated GGFFBF was reused to prepare the slick water fracturing fluid. The effects of various process parameters on the treatment effect were explored. The results showed that when adjusting the pH value of the 500 mL GGFFBF to 9.0 and adding 800 mg/L flocculant IF-A and 1.0 mg/L coagulant FA-B,and then pumping O3 for 40 min at a speed of 30 mL/min,the treated GGFFBF was colorless,clear and transparent,and the water quality was good. The SS content was less than 3.0 mg/L,the Fe ion content was below 0.5 mg/L,the viscosity was reduced to 1.28 mPa·s,and the bacterial content was low. The slick water fracturing fluid was prepared with the treated GGFFBF,and the performance of the slick water fracturing fluid was similar to that of the slick water fracturing fluid prepared with tap water,according with DB.61/T 575-2013 standard. The treated GGFFBF met the requirements for water preparation for slick water fracturing fluid.