探井残余压裂液无害化处理实验研究

【作者】 万里平；

【导师】 赵立志；

【作者基本信息】 西南石油学院 ， 应用化学， 2002， 硕士

【摘要】 油气井压裂作业是油气井增产的主要措施之一，为各油田普遍采用。油气井在压裂过程中产生的压裂返排液已成为当前油田水体污染源之一。本文通过对压裂返排液的来源、水质特征、治理现状及处理前景的分析，并针对河南南阳探23井的具体水质情况，提出了两套处理方案。方案一为“五步法”，即“混凝沉降—次氯酸钠氧化—Fe／C微电解—H₂O₂／Fe²⁺催化氧化—活性炭吸附”，方案二为压裂废水整体固化处理。本文探讨了各种处理方法的机理，通过实验确定了最佳工艺条件并用模糊综合评价法对固化等级进行了划分。结果表明，经“五步法”处理后的压裂液可达到国家二级排放标准，固化处理后的固化块可填埋或铺路，因固化法具有固化材料易得、处理效果好、成本较“五步法”低的优势，建议南阳油田采用固化填埋法处理压裂返排液。更多还原

【Abstract】 Fracturing are adopted popularly by oilfields in order to improve oil/gas production. The fracturing fluid produced in the process of fracturing operations is one of sources of polluted water. According to the analysis of the source, water quality characteristics, present treatment condition and disposal problem of fracturing fluid, and based on the water quality of exploratory well 23 in Han Yang oilfield, this paper puts forward two methods to treat fracturing fluid. One project is "five-step", namely "coagulation and settling - NaClO oxidation - Fe/C micro-electrolysis - catalytic oxidation - active carbon adsorption", another project is solidifying treatment of fracturing fluid. In this paper, all mechanisms of the treating method have been discussed and the best technological process was determined in the laboratory, and degree of solidification was classified by using fuzzy comprehensive assessment. The results showed that quality of fracturing fluid disposed by "five-step" met the discharge standard (GB8978-1996, II grade), solidifying stack can be buried or paved. Because solidification has the merits of easily buying materials, good treatment effect and lower expenditure than "five-step", We suggest Nan Yang oilfield adopting solidifying to treat fracturing fluid.更多还原