稠化水清洁压裂液返排液驱油技术

Oil Displacement Technology Based on Clean Fracturing Fluid Flow-back Water

王所良 王玉功 李志航

WANG Suoliang WANG Yugong LI Zhihang

为解决稠化水清洁压裂液返排液清洁化处理难题， 借鉴表面活性剂驱的技术特点， 研究了返排液与原油间的界面张力、 乳化性能、 润湿反转性能、 吸附性能及提高采收率性能， 评价了稠化水清洁压裂液返排液作为驱油剂的可行性。在长庆油田长 8储层条件下， 质量分数 0.001%～ 0.03%的稠化水清洁压裂液破胶液与原油间的界面张力可达 10-3～ 10-2 mN/m， 在 60～ 90℃下质量分数 0.006%的破胶液与原油间的界面张力均可达到 10-3 mN/m超低数量级。该破胶液的乳化性能优良， 质量分数 0.004%～ 0.008%的破胶液与原油形成的乳状液的析水率＜60%； 该破胶液具有润湿反转能力， 可将亲油及亲水的石英表面转变为弱亲水表面。注入 0.3 PV的质量分数0.006%的破胶液， 原油采收率在水驱基础上可提高10.04%。稠化水清洁压裂液返排液驱油技术实现了稠化水压裂返排液变废为宝、 绿色环保的目标， 同时为低渗油藏进一步提高采收率提供了技术支持。图10表1参15

In order to resolve the fracturing fluid flow-back water treatment problems，the feasibility that the flow-back water of clean fracturing fluid was used as oil displacement agent for enhanced oil recovery was evaluated according to the surfactant fluid flooding technique. The properties of interfacial tension，wettability reversion，adsorption and EOR of the broken fluid of the clean fracturing fluid were studied. The interfacial tension between the broken fluid with mass fraction of 0.001%—0.03% and crude oil was about 10-3—10-2 mN/m，and the interfacial tension between the broken fluid with mass fraction of 0.006% and the crude oil was 10-3 mN/m ultra-low magnitude at the temperature rang from 60 to 90℃. The broken fluid had good emulsifying ability，the water separating proportion of the emulsion，prepared by mixing the broken fluid with mass fraction 0.004%—0.008% and the crude oil at volume ratio of 1∶1，was less than 60%，moreover，the broken fluid possessed good wettability alteration ability，which could change both the oil-wet and water-wet quartz surface to weak water-wet. The enhanced oil recovery was up to 10.04% based on water flooding，when 0.3 PV of 0.006% broken fluid was injected into core in laboratory. The purpose of environment protection and flow-back water reuse were realized，and the oil displacement agent system based on the clean fracturing fluid flow-back water gives a technical support for the further development of low permeability reservoirs.

10.19346/j.cnki.1000-4092.2016.04.011