Synthesis and Evaluation of High Temperature Water Base Drilling Fluid Filter Loss Reducer
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摘要: 钻井液用降滤失剂在高温、盐水等复杂环境下失效是深井、超深井钻探开发过程中遇到的突出问题。采用丙烯酰胺(AM)、2-丙烯酰胺-2-甲基丙磺酸(AMPS)、N-乙烯基吡咯烷酮(NVP)和N-异丙基丙烯酰胺(NIPAM)为原料,合成了水基钻井液用抗高温降滤失剂JLS200,并对其进行了红外光谱和热重分析,评价了其在钻井液中的性能。结果表明,所合成的抗高温降滤失剂热稳定性好,抗温达200℃,抗盐至饱和;在KCl钻井液中具有良好的配伍性,滤失量低、流变性好,加入1% JLS200后,200℃老化后的API滤失量由12 mL降至3.2 mL,高温高压滤失量由54 mL降至15 mL,高温老化前后钻井液黏度和切力变化不大。该钻井液用降滤失剂具有较好的应用前景。Abstract: Malfunction of filter loss reducer at elevated temperatures and high salinity environments are difficult problems encountered in deep and ultra-deep well drilling.A high temperature water base drilling fluid filter loss reducer,JLS200,has been developed using acryl amide,2-acrylamide-2-methyl propane sulfonic acid,N-Vinyl pyrrolidone and N-isopropyl acrylamide as raw materials.JLS200,as indicated by laboratory evaluation,can be used at 200℃,or in saturated saltwater drilling fluids,without losing its filtration control capacity.KCl drilling fluids treated with JLS200 have low filtration rate and good rheology,the API filtration rate has been reduced from 12 mL to 3.2 mL after treatment of the fluids with 1% JLS200 and ageing at 200℃,while the HTHP filtration rate reduced from 54 mL to 15 mL.The viscosity and gel strengths do not change remarkably before and after the treatment.JLS200 as a high performance filter loss reducer will find its application in deep and ultra-deep well drilling.
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