耐温抗盐聚合物微球降滤失剂的制备与性能评价*

Preparation and Performance Evaluation of Polymer Microsphere Fluid Loss Additive with Property of Temperature Tolerance and Salt Resistance

陶丹阳 杜文浩 田圆芳 赵志新 徐 进 杨召杰 张 熙

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

为揭示聚合物微球在钻井液中的性能特征，制备具有优良耐温抗盐性能的降滤失剂，以聚乙二醇水溶液为 分散介质，丙烯酰胺、丙烯酸、多官能团丙烯酸酯为主要单体，聚丙烯酸为分散稳定剂，采用氧化还原引发体系， 通过水分散聚合方法合成了微米级亲水性阴离子型交联聚合物微球。采用粒度分析、扫描电镜等方法表征了聚 合物微球的粒径大小及形貌，研究了聚合物微球对钻井液性能的影响。结果表明，制备的聚合物微球为平均粒 径小于10 μm的球状颗粒材料，能有效降低钻井液滤失量，对钻井液流变性的影响较小，耐温性能优良，其起始 分解温度为290.3℃。组成为4%膨润土+3%聚合物微球的钻井液经200℃老化16 h后的滤失量可保持在10.5 mL。该聚合物微球降滤失剂具有优良的抗盐抗钙性能，组成为4%膨润土+3%聚合物微球的钻井液在加入NaCl 或CaCl2后的表观黏度、塑性黏度以及动切力变化较小，NaCl加量为2%和CaCl2加量为1%时的滤失量分别为 11.0、14.0 mL，显示出优良的抗盐（钙）污染能力。图3表6参10

In order to reveal the performance characteristics of polymer microsphere used in the drilling fluid and prepare fluid loss additive possessing the excellent property of high temperature tolerance and salt resistance，using polyethylene glycol aqueous solution as the dispersion medium，acrylamide（AM），acrylic acid（AA）and multifunctional acrylate as main monomers， polyacrylic acid as the dispersant，and using redox initiator as initiating system，a kind of micrometer scale hydrophilic anion cross-linked polymer microsphere was synthesized by the aqueous dispersion polymerization. The particle size and morphology of polymer microsphere was characterized by particle size analysis and scanning electron microscopy（SEM）. The results showed that the average particle size of the prepared polymer microsphere was less than 10 μm. The polymer microsphere could effectively reduce the volume of drilling fluid filtration and had little influence on the rheological property of drilling fluid. Polymer microsphere possessed excellent property of high temperature tolerance，whose initial decomposition temperature was 290.3℃. The filtration of the drilling fluid containing 4% bentonite and 3% polymer microsphere could be controlled within 10.5 mL after ageing treatment for 16 h at 200℃. The fluid loss additive possessed excellent property of resistance to sodium and calcium. The apparent viscosity，plastic viscosity and dynamic shear force of the drilling fluid containing 4% bentonite and 3% polymer microsphere had little changed after adding NaCl and CaCl2. The filtration was 11.0 mL when the content of NaCl was 2% and the filtration was 14.0 mL when the content of CaCl2 was 1%，which showed good resistance to sodium and calcium pollution.

10.19346/j.cnki.1000-4092.2020.03.002