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在注水开发西西伯利亚复矿碎屑储集层的油田时,油井产量急剧下降,达不到自身的潜在产能。造成近井地带油层渗滤特性变差的原因有以下几种:①生成水堵;②在矿化度比地层水低的潜水作用下粘土的膨胀;③形成稳定的油水乳化液;④从原油中析出沥青胶质和石蜡沉积等。为了改善油层近井地带的渗流特性,建议采用各种混合组分和处理油井的方法,如采用表面活性剂水溶液,特别是阳离子表面活性剂水溶液。目前有关阳离子表面活性剂对渗流和驱油过程的作用机理尚无统一的看法,因此在准备试验时只凭经验来选择阳离子表面活性剂及其浓度。
When waterflooding oil fields in West Siberia complex ore reservoir, oil well production dropped sharply, not reaching its potential capacity. The reasons for the deterioration of the percolation characteristics of the near wellbore formation include the following: ① water plugging; ② clay expansion under the action of subducting subduction of formation water; ③ formation of a stable oil-water emulsion; In the deposition of asphalt and paraffin deposition and so on. In order to improve the seepage properties near the wellbore of the reservoir, it is advisable to use a variety of mixing components and methods of treating the well, such as using a surfactant aqueous solution, especially a cationic surfactant aqueous solution. At present, there is no unified opinion on the mechanism of action of cationic surfactants on seepage and oil displacement processes. Therefore, the cationic surfactants and their concentrations should be selected empirically when preparing the test.