抗高温水泥浆体系研究与应用

为了解决现有水泥浆体系抗高温能力差的问题,研制了抗高温降失水剂DRF-120L和与之配伍性好的其他抗高温水泥外加剂,开发了一种以抗高温降失水剂DRF-120L为主剂的抗高温水泥浆体系。在室内对该抗高温水泥浆体系的性能进行了评价,结果表明:该水泥浆体系能抗200℃高温;抗盐性能好,即使采用饱和盐水配浆,性能也能达到高温深井固井要求;失水量可以控制在100 mL以内;稠化时间易调;水泥石抗压强度高。该抗高温水泥浆体系在辽河油田、塔里木油田及华北油田的7口高温深井固井作业中进行了应用,固井质量全部达到合格以上。这表明该抗高温水泥浆体系综合性能能满足高温深井固井要求,解决了水泥浆体系抗高温能力差的问题。 

Research and Application of Thermostable Cement Slurry

In order to solve the problem of performance deterioration of cement slurry at high temperature,a thermo-stable cement slurry system was developed with DRF-120L as the main additive in the cement slurry based on the thermostable fluid loss additive DRF-120L,by means of optimizing other compatible additives.Evaluations on performance of the cement slurry were carried out based on laboratory analysis.The results showed that the cement slurry could be used at the temperature up to 200 ℃;it has good salt tolerance property,and even used in saturated brine,it could meet the high-temperature cementing requirements in deep wells;its fluid loss could be controlled under 100 mL,thickening time could be easily adjusted,compressive strength of set cement was high.Pilot tests of this cementing system were conducted in seven wells in Tarimu,Liaohe and Huabei Oilfields,cementing quality of these wells was qualified.This indicated that comprehensive performance of this kind of thermostable cement slurry system could meet the technical requirements for high temperature and deep well cementing,the problem of performance deterioration of cement slurry at high temperature had been solved.