甜菜碱共聚物钻井液降滤失剂的合成与性能研究

发布时间：2018-01-09 14:15

本文关键词：甜菜碱共聚物钻井液降滤失剂的合成与性能研究　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着油气资源的勘探与开发逐渐向深部地层发展,这也对钻井液的性能提出了更高的要求。针对这一问题,本文设计并制备了一种新型的甜菜碱型共聚物作为抗高温耐盐钻井液用降滤失剂。本研究以1,3-丙烷磺内酯和1-乙烯基咪唑为原料,合成了一种甜菜碱单体3-(3丙磺酸)丙基-1-乙烯基咪唑(VPS)。将合成甜菜碱单体VPS与AM、AMPS和DMDAAC采用自由基水溶液共聚的方式制备了一种两性离子共聚物PVAAD作为钻井液用降滤失剂。以PVAAD质量分数为1%的淡水基浆的API滤失量为评价标准,采用单因素实验得出了具有最佳降滤失效果的合成条件。通过红外光谱法和核磁氢谱法对PVAAD的结构进行了表征,结果表明合成产物的分子结构与目标产物一致。采用乌氏粘度计法及凝胶渗透色谱法(GPC)测试了 PVAAD的特性黏数和分子量分布。结果显示,PVAAD的特性黏数为143.4 mL/g,其分子量主要分布在6918 g/mol到4466385 g/mol之间。性能评价实验表明,合成的PVAAD具有良好的降滤失性及耐温抗盐性能,PVAAD质量分数为1.25%时,淡水基浆、饱和盐水基浆及复合盐水基浆的API滤失量分别为4.8 mL、4.0 mL和5.6 mL。考虑到PVAAD加量达到1.25%后,基浆API滤失量的下降幅度较小,故确定PVAAD作为钻井液降滤失剂的最佳加量为1.25%。PVAAD-淡水基浆体系经200℃老化16 h后的API滤失量为19.2 mL。PVAAD-淡水基浆体系中分别加入质量分数为36%的NaCl和74%的CaCl2后,二者的API滤失量分别为4.0 mL和9.0 mL,且PVAAD能有效改善基浆体系的流变性能。与6种常用的降滤失剂相比,合成的PVAAD表现出了更好的降滤失性及耐温性能。PVAAD同时具有良好的抑制性能,在其质量分数为2.0%的淡水基浆中,四川红土和普通泥页岩的一次回收率分别为72.20%和92.80%。与其它降滤失剂的复配实验表明,JT-888、FT-1、SMC与PVAAD具有良好好的协同增效作用。复配体系研究实验证明,PVAAD与磺化沥青(FT-1)、重钙和轻钙复配使用后的基浆体系具有较好的失水造壁性、耐温性及流变性能,具有较好性能的配方为:1%重钙+2%轻钙+1.25%PVAAD +2%FT-1。适应性能评价实验表明,合成的降滤失剂PVAAD与新疆油田常用的3种钻井完井液体系都具有良好的适应性能。且采用PVAAD等量替换3种钻井液体系中的同类产品后,3种基浆体系都表现出了更好的降滤失及流变性能。采用扫描电镜法和粒度分析法研究了 PVAAD作降滤失剂的微观机理。扫描电镜测试显示,在淡水基浆中加入1.25%的PVAAD后,淡水基浆滤饼的表面变得更加均匀及致密。粒度分析实验表明,在淡水基浆中加入质量分数为1.25%的PVAAD后,体系中的大黏土颗粒减少,其粒度分布曲线又单峰变为双峰,同时0.1μm～1μm之间的小颗粒变多,这种广泛的粒径分布使得基浆体系中的颗粒分配趋于合理化。
[Abstract]:With the exploration and development of oil and gas resources gradually to the deep stratum development, the performance of the drilling fluid has put forward higher requirements. To solve this problem, this paper presents the design and preparation of a novel betaine type copolymer as high temperature resistant and salt drilling fluid filtrate reducer based on the 1,3-. Propane sultone and 1- vinyl imidazole, a betaine monomer to synthesize 3- (3 propane sulfonic acid) -1- propyl vinyl imidazole (VPS). The synthesis of betaine monomer VPS and AM, AMPS and DMDAAC in aqueous solution by radical copolymerization was a zwitterionic copolymer prepared by PVAAD as the drilling fluid loss agent with filtrate. Filter API of 1% fresh water base slurry to the mass fraction of PVAAD loss as evaluation standard, using the single factor experiment the synthesis condition has the best filtration effect. By infrared spectroscopy and 1H NMR spectrum structure of PVAAD was characterized, The results showed that the molecular structure of the target product with favorable synthetic product. Permeation chromatography by Ubbelohde viscometer method and gel (GPC) PVAAD characteristic viscosity and molecular weight distribution were tested. The results showed that the PVAAD characteristic viscosity is 143.4 mL/g, its molecular weight is mainly distributed in the 6918 g/mol to 4466385 g/mol show that the performance evaluation. The synthesis of PVAAD has excellent filtration property and temperature resistance and salt tolerance, PVAAD mass fraction was 1.25%, the water base slurry, filter API saturated brine mud and compound salt water base slurry loss were 4.8 mL, 4 mL and 5.6 mL. taking into account the PVAAD amount reached 1.25% after radical API slurry filtration decreased to a lesser extent, so as to determine the PVAAD fluid loss agent the optimum amount of 1.25%.PVAAD- water base slurry system by 200 c API 16 h after aging the filter loss of mass fraction were added to 19.2 mL.PVAAD- water base slurry system 36% NaCl and 74% CaCl2, API of the two filter loss were 4 mL and 9 mL, and PVAAD can effectively improve the rheological properties of slurry system. And 6 kinds of filtration reducing agent compared to synthetic PVAAD showed better filtrate loss and heat resistance.PVAAD also has good inhibiting properties, in the mass fraction of water base slurry 2%, a recovery of Sichuan clay and ordinary shale respectively show that the compound experiment 72.20% and 92.80%. and other filtration reducing agent JT-888, FT-1, SMC and PVAAD have good synergistic effect of complex ligands. Department of experimental studies show that PVAAD and sulfonated asphalt (FT-1), medium slurry were used after calcium and light calcium has good filtration properties, heat resistance and rheological properties, which has better performance of the formula is: 1% +2% +1.25%PVAAD to +2%FT-1. TSP light performance evaluation experiments indicated that the synthesis of Have to adapt to the good performance of the filtrate of 3 kinds of drilling fluid system in Xinjiang oilfield and agent PVAAD used by PVAAD. And the equivalent substitution of 3 kinds of drilling fluid system in similar products, 3 kinds of slurry system showed better fluid loss and rheological properties of scanning electron microscopy and particle size analysis. PVAAD method is used to study the microscopic mechanism of filtration reducing agent. By using scanning electron microscopy showed that the addition of 1.25% PVAAD in fresh water mud after surface fresh water mud cake becomes more uniform and compact. The grain size analysis experiments show that in fresh water mud containing 1.25% PVAAD after reduction in the system of clay particles, the particle size distribution curve is unimodal into Shuangfeng, while the small particles between 0.1 M ~ 1 m number, the particle distribution in the matrix slurry system to rationalize this broad particle size distribution.

【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE254.4

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