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塔里木某油田经过长期开发已进入油田开发的中后期,油井产水率普遍较高,地层压力系数已下降至0.79MPa/100m,在冲砂作业中如果采用常规的修井液必然会发生大量修井液的漏失,并造成严重的地层损害。固化水修井液通过物理脱水作用在孔眼或井壁上形成封堵层,并利用井下高温(120℃以上)引起封堵层的化学反应,使封堵层形成胶质的人工井壁,一方面有效地阻断了工作液在储层的渗漏,解决了高温低压储层保护储层技术难题。本文针对固化水选择性堵水开展了实验研究,对注入性及阻力系数、突破压力梯度、封堵率及耐冲刷性,进行了固化水选择性堵水效果的综合评价。通过固化水工作液在塔里木某油田1、1-H2、1-7-12、1-6-8四口井的施工结果可以看出,其具有很好的冲砂和堵水效果。
After a long period of development, an oilfield in Tarim has entered the middle and late stages of oilfield development. Oil well productivity is generally high, and formation pressure coefficient has dropped to 0.79MPa / 100m. If a conventional workover fluid is used in sand blasting operation, a large amount of repair work is bound to occur Well fluid loss, and cause serious damage to the formation. Curing fluid workover fluid through the physical dehydration in the hole or borehole wall to form a plugging layer, and the use of downhole high temperature (above 120 ℃) caused by blocking the chemical reaction, the plugging layer to form a gel artificial wall, a Effectively blocking the working fluid leakage in the reservoir to solve the high temperature low pressure reservoir protection technology problems. In this paper, experimental study on selective water plugging of solidified water was carried out. The comprehensive evaluation of selective water plugging effect on solidified water was carried out on injectability, drag coefficient, breakthrough pressure gradient, plugging rate and erosion resistance. Through the curing water working fluid in Tarim oil field 1,1-H2,1-7-12,1-6-8 four wells of the construction results can be seen that it has good sand and water blocking effect.