Preparation of and Study on a High Temperature Filter Loss Reducer
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摘要: 为满足深层油气资源勘探开发钻井施工的需要,提高钻井液的抗温、抗盐抗钙等能力,采用2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、丙烯酰胺(AM)、N-乙烯基吡咯烷酮(NVP)和4-羟基苯磺酸钠(SHBS)为单体,辣根过氧化物酶(HRP)为催化剂,采用酶促反应方法,制备了分子主链中具苯环的新型钻井液降滤失剂PAANS,基于相同反应条件合成未含苯环结构的对比聚合物PAAN,并借助核磁共振光谱(1H NMR)进行了结构表征。流变和滤失性能测试结果表明,220℃老化16 h,加量为2.0% PAANS的钻井液的表观黏度、塑性黏度、动切力、常温中压滤失量和高温高压滤失量分别为16.5 mPa·s,10.5 mPa·s、6.0 Pa、12.4 mL和24.0 mL,抗盐可达饱和,具有一定的抗钙能力,性能明显优于PAAN钻井液。通过对吸附量、粒径分布和滤饼微观结构的测试等,揭示了分子主链含有苯环结构的刚性抗高温降滤失剂的作用机理。Abstract: Drilling fluids for deep well drilling should have the ability to resist the negative effects of high temperatures and salt and calcium contamination. A new drilling fluid filter loss reducer, PAANS, has been developed to satisfy the needs as mentioned above. PAANS was synthesized through enzymatic reaction, with monomers such as 2-acrylamide-2-methylpropane sulfonic acid (AMPS), acrylamide (AA), N-vinyl pyrrolidone (NVP) and sodium 4-hydroxybenzenesulfonate (SHBS). Catalyst used in the reaction was horseradish peroxidase (HRP). PAANS has benzene ring in its molecules. Another reference polymer, PAAN was also synthesized at the same reaction conditions, with no benzene ring in its molecules. The molecular structure of the two polymers was characterized with 1H NMR. Rheology and filtration test results showed that, the properties of a drilling fluid sample treated with 2.0% PAANS and aged at 220℃ for 16 h, were as follows:apparent viscosity=16.5 mPa·s, plastic viscosity=10.5 mPa·s, yield point=6.0 Pa, API filtration rate=12.4 mL, and HTHP filtration rate=24.0 mL. The PAANS treated drilling fluid had the ability to resist salt contamination to saturation and calcium contamination to some extent. Obviously, the performance of the PAANS treated drilling fluid is superior to the performance of the PAAN treated drilling fluid. Experiments on adsorption capacity and particle size distribution of PAANS, and mud cake microstructure have revealed that the mechanisms of filter loss control by PAANS is because there are benzene rings distributed on the molecular backbones of PAANS, thereby forming a rigid molecular structure.
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