基于聚合物微球的复合降滤失剂的制备与性能评价

Preparation and Performance Evaluation of Compound Fluid Loss Agent Based on Polymer Microsphere

田圆芳 陶丹阳 杜文浩 徐 进 张甲樋 赵志新 张 熙

TIAN Yuanfang，TAO Danyang，DU Wenhao，XU Jin，ZHANG Jiatong，ZHAO Zhixin，ZHANG Xi

为制备耐温抗盐性能优良的钻井液降滤失剂，以丙烯酰胺、丙烯酸和多功能团丙烯酸酯为主要原料制备了聚合物微球（PMS），以丙烯酰胺、2-丙烯酰胺基-2-甲基丙磺酸、N-乙烯基吡咯烷酮为主要原料制备了线性聚合物（PAAN），采用PMS与PAAN复合的方法制备了聚合物微球复合钻井液降滤失剂（CLS）。采用热重分析、扫描电镜、Zeta电位分析和钻井液性能测试等方法评价了CLS的性能。结果表明，由PMS和PAAN复合而成的降滤失剂CLS组分间具有协同效应，降滤失作用好于任一单一组分。CLS对钻井液流变性的影响小，降滤失效果优良。对于膨润土含量为4%的钻井液，CLS加量在0-1%范围内变化时表观黏度变化幅度在±2.0 mPa·s以内，加量为0.6%时钻井液滤失量可降至6.0 mL。CLS起始分解温度为276℃，组成为4%膨润土+1.2% CLS的钻井液经180℃老化16 h后的滤失量保持在9.0 mL；在加入6%的NaCl后滤失量仅由5.5 mL增至7.0 mL，表现出优异的耐温抗盐性能。

In order to prepare a temperature-resistant and salt-resistant fluid loss agent for drilling fluid，polymer microsphere（PMS）was prepared with acrylamide，acrylic acid and multifunctional acrylate as the main raw materials. The linear polymer（PAAN）was synthesized with acrylamide，2-acrylamido-2-methyl-1-propanesulfonic acid and N-vinyl-2-pyrrolidone，and the polymer microsphere compound fluid loss agent （CLS） was made by the method of compounding PMS and PAAN. The performance of CLS was evaluated by thermogravimetric analysis，scanning electron microscope，Zeta potential analysis and drilling fluid performance testing. The results showed that the compound fluid loss agent CLS composed of PMS and PAAN had a synergistic effect between the components，and the fluid loss reduction performance was better than that of any single component. CLS had little effect on the rheology of drilling fluid and had excellent fluid loss reduction effect. In a drilling fluid with a bentonite content of 4%，when the dosage of CLS was 0—1%，the apparent viscosity of drilling fluid changed within ±2.0 mPa·s. When the dosage of CLS was 0.6%，the fluid loss of drilling fluid could be reduced to 6.0 mL. The initial decomposition temperature of CLS was 276℃. After the drilling fluid composed of 4% bentonite and 1.2% CLS was aged at 180℃ for 16 h，the fluid loss remained at 9.0 mL. After adding 6% NaCl，the fluid loss only changed from 5.5 mL to 7.0 mL，showing excellent temperature and salt resistance.