抗高温水泥浆体系研究及应用

Research and Application of Thermostable Cement Slurry System

摘要:

基于塔河外围区块深井、超深井对水泥浆基本性能要求，考虑高温高压对浆体性能影响，通过分析抗高温材料的作用机理，优选出适合高温水泥浆体系的外加剂，将缓凝剂、降失水剂、液硅等抗高温材料按需求配比，研究不同密度抗高温（≥120 ℃）水泥浆体系，测定其常规性能。该水泥浆体系流动性好、API失水量＜50 mL/30 min、防窜系数SPN值＜1，水泥石高温稳定性好、抗压强度高等，均满足高温高压井下施工要求。该抗高温水泥浆体系在顺北评1H、顺北7、中探1井应用效果良好，优良率高。

关键词:高温;水泥浆;缓凝剂;降失水剂;防气窜;抗压强度

Abstract:

Based on the basic performance requirements of cement slurry in deep and ultra-deep wells in Tahe peripheral blocks and considering the effect of high temperature and high pressure on the cement slurry performance, by analyzing the mechanism of thermostable materials, the additives suitable for thermostable cement slurry are selected. The retarder, fluid loss additive, nano liquid silica and some other thermostable materials are mixed according to the requirements to carry out the research on thermostable（≥120℃）cement slurry system with different density and measure the regular properties. This series of cement slurry, with the characteristics of good fluidity, API filter loss less than 50mL, anti-gas-migration coefficient SPN less than 1, high temperature stability and high compressive strength of the set cement, can meet the technical requirements for high temperature and high pressure underground construction. This series of thermostable cement slurry have been used in the cementing of the well-SHBP1H， well-SHB7 and well-Zhongtan1 with high excellent rate.

Key words:high temperature; cement slurry; retarder; fluid loss additive; anti-gas-migration; compressive strength