具有双重交联结构降滤失剂的制备及性能评价
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中海油田服务股份有限公司油田化学研究院

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中海油田服务股份有限公司前瞻基础类项目“高AM含量降滤失剂合成方法与性能关系研究”(项目编号E-23246003)。


Fabrication and Performance Evaluation of Filter Loss Reducer with Double Cross-linked Architectures
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    摘要:

    人工合成聚合物作为水基钻井液降滤失剂仅通过改变共聚物官能团的类型和比例已很难满足钻井工程的需要,尤其是在超高温高盐度条件下通过加大弄能单体的使用量无疑会增加其成本。而本研究通过从交联剂着手,在主单体丙烯酰胺(AM)中添加抗盐单体2-丙烯酰胺-2-甲基丙磺酸(AMPS)和耐温单体N-乙烯基吡咯烷酮(NVP),同时采用有机交联剂和金属交联剂,制备具有双重交联结构的降滤失剂。以聚合物的高温降滤失效果为考察指标,采用单因素实验优化合成条件:搅拌速度300 rpm、单体质量比AM/AMPS/NVP为18/1/1、交联剂用量2.0wt%、有机交联剂/金属交联剂质量比(OC/MC)为1/3、油水质量比为3/2、引发剂用量为1.0 wt%。并利用激光粒度分析仪、傅里叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM-EDS)、和热重分析仪(TGA)对共聚物的粒径分布、微观结构、表面形貌、元素分布和耐热性能进行了表征。含有0.5 wt/vol%聚合物的体系在210℃下热滚动16小时后的高温高压滤失量(FLHTHP)和API滤失量(FLAPI)分别由77.6mL和18.8mL降至31.2ml和6.6ml。结果表明,具有双重交联结构降滤失剂的加入可以显著提高基浆的耐高温性能。阐述了具有双重交联结构降滤失剂的抗高温机理,水解后的聚合物分子链与金属交联剂进行了二次交联,这样才保护了水解的聚合物分子链不会快速的降解,从而形成了更加致密复杂的三维网络结构,使得聚合物降滤失剂表现出了优异的耐温抗盐降滤失性能。

    Abstract:

    It is difficult to meet the needs of drilling engineering by simply changing the type and proportion of copolymer functional groups, for artificially synthesized polymers to be used as filtrate reducers for water-based drilling fluids, increasing the usage of energetic monomers will undoubtedly increase its cost, especially under ultra-high temperature and high salinity conditions, This study prepared a dual cross-linked fluid loss reducer by adding salt resistant monomer 2-acrylamide-2-methylpropanesulfonic acid (AMPS) and temperature resistant monomer N-vinylpyrrolidone (NVP) to the main monomer acrylamide (AM), and using organic and metal crosslinkers. Using the high-temperature filtration reduction effect of polymers as the evaluation index, single factor experiments were used to optimize the synthesis conditions: stirring speed of 300 rpm, monomer mass ratio AM/AMPS/NVP of 18/1/1, crosslinking agent dosage of 2.0wt%, organic crosslinking agent/metal crosslinking agent mass ratio (OC/MC) of 1/3, oil-water mass ratio of 3/2, and initiator dosage of 1.0 wt%. And the particle size distribution, surface morphology, element distribution, microstructure, and heat resistance of the copolymer were characterized using laser particle size analyzer, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM-EDS), and thermogravimetric analyzer (TGA). The high temperature and high pressure filtration loss (FLHTHP) and API filtration loss (FLAPI) of the system containing 1.0wt/vol% polymer decreased from 77.6mL and 18.8mL respectively to 31.2ml and 6.6ml after 16 hours of hot rolling at 210 ℃. The results indicate that the addition of a dual cross-linked structure filtrate reducer can significantly improve the high-temperature resistance of the base slurry. This article elaborates on the high-temperature and salt resistance mechanism of a dual cross-linked structure fluid loss reducer. The hydrolyzed polymer molecular chain undergoes secondary cross-linking with the metal cross-linking agent, which protects the hydrolyzed polymer molecular chain from rapid degradation and forms a more dense and complex three-dimensional network structure, resulting in excellent temperature resistance and fluid loss performance of the polymer fluid loss reducer.

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  • 收稿日期: 2024-07-15
  • 最后修改日期: 2024-10-28
  • 录用日期: 2024-11-05
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