抗温抗盐聚合物降滤失剂的研制及其作用机制

针对当前国内外超高温水基钻井液滤失性及高温稳定性调控难点,新研制出抗240 ℃高温、抗盐聚合物降滤失剂HTP–1。热重分析表明,HTP–1 分子链热解温度达320 ℃以上,热稳定性强;在各种钻井液基浆中的降滤失作用评价结果表明,HTP–1 在钻井液中具有优异的抗高温（240 ℃）抗盐（饱和）、抗钙（0.5%）降滤失作用,优于国内外同类产品。通过吸附实验、粒度分布测量、胶体稳定性测试和泥饼压缩性测试等手段,探讨了HTP–1 的降滤失作用机理：（1）在粘土颗粒上的吸附量大且吸附牢固,受矿化度、pH 值和温度的影响小;（2）老化（240 ℃/16 h）前后均能明显改善泥饼可压缩性,降低其渗透率;（3）增强钻井液体系的胶体稳定性,改善其中的颗粒粒径级配。

Development of Anti High Temperature and Salt Polymer Fluid Loss Agentand Study on its Operation Mechanisms

Aimed at the present problem of filtration property and high temperature stability adjusting of high temperaturewater base drilling fluid around the world,the polymer fluid loss agent HTP–1 anti 240 ℃ and salts are developed. The resultof gravitational thermal analysis indicates that the pyrolytic temperature of molecule chain of HTP–1 is up to 320 ℃,and hasstrong thermal stability. Evaluation results of dropping filtration performance several drilling fluid slurry show that HTP–1has excellent fluid loss decreasing performance and high temperature（240 ℃）,salt（saturated brine）and calcium（0.5%）tolerance,overmatching congeneric fluid loss additive at home and abroad. The mechanism of action of HTP–1 is studied byexperiments such as adsorption,particle size distribution measuring,colloid stability measuring and compressibility of filtercake testing,which is as follows：HTP–1（1）adsorbs clay particles fast and in large amounts,its performance is not very muchinfluenced by salt pH and temperature;（2）observably reduce the permeability and improve compressibility of filter cake beforeand after aged sixteen hours under 240 ℃;（3）improves particle size grading and colloid stability of drilling fluid system.