共查询到16条相似文献,搜索用时 93 毫秒
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粘弹性表面活性剂(Viscoelastic surfactant,下文简称VES)压裂液与传统聚合物压裂液不同,可消除残余聚合物对支撑剂充填层的堵塞,并能有效提高导流能力,减少对地层的损害及污染,压后油气产量比使用传统压裂液有显著提高。介绍了VES压裂液的原理及配方设计原则。通过室内试验确定了一种经济型VES压裂液的配方,并对其性能进行了相关评价。 相似文献
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粘弹性表面活性剂基压裂液的研究与分析 总被引:2,自引:0,他引:2
粘弹性表面活性剂基压裂液(VES压裂液)作为环保压裂液在国内外油田的应用已经取得良好的效果,对储层无污染,且能提高充填层导流能力。论述了粘弹性表面活性剂基压裂液的体系组成、主要特点和压裂机理。该压裂液及剪切稳定性、零伤害性、自动破胶性和低滤失性于一体,在油田具有广阔的应用前景。特别是纳米技术的应用,进一步优化了VES压裂液体系,使该压裂液也适应于干气气藏。介绍了VES压裂液在国内外的研究进展,提出了其应用的优越性和存在的不足。 相似文献
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裂缝性油藏中出现的天然裂缝会在水力压裂过程中发生剪切或者破坏等一系列现象,这导致了压裂液的滤失情况十分严重,进一步造成砂堵或者加砂困难等问题。针对裂缝性油藏中压裂液滤失严重的问题,通过研究阴离子型VES压裂液的性能来降低压裂液的滤失量。测试了VES压裂液的流变性能、耐温性能、粘弹性能、悬砂性能及破胶性能。研究表明,VES压裂液的耐剪切性很好,可以维持长时间的工作要求,在低剪切力下可以维持粘度的不变,在提高剪切速率时粘度会开始下降,在剪切速率得到回降后粘度又可以快速恢复;VES压裂液在60℃的地层中利用率最高,此温度下的粘度最大,弹性也最大,不可用于高于80℃的地层;VES压裂液支撑剂沉降速度很低悬砂性能很好,破胶很快且很彻底;这些优越的性能可以大量减少裂缝性油藏在水力压裂过程中压裂液的滤失量。 相似文献
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聚合物清洁压裂液增稠剂水不溶物极低,在防止储层二次伤害,提高返排方面明显优于羟丙基胍胶、瓜尔胶压裂液。聚合物清洁压裂液有别于VES清洁压裂液,它克服了VES清洁压裂液胶束稳定性差,在水和油存在下失效,对配制环境要求高,配制繁琐的弱点,具有较好的悬砂性、耐温耐剪切性,易破胶返排。经现场试验表明,该压裂液具有较好的推广应用前景。 相似文献
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Xuepeng Wu Jianwu Zhen Bitao Song Shuyang Gao Zhaohui Song Junbin Jin 《Journal of surfactants and detergents》2020,23(5):863-872
A pH-responsive amphiphilic surfactant stearic amide 3-(N,N-dimethylamino)propylamide (SAA) was synthesized and served as a thickener in aqueous solution to construct a switchable viscoelastic surfactant fluid (VES fluid). The structure of SAA was studied by 1H NMR, and the viscoelastic behavior of VES fluid was studied in detail by rheological measurements. The viscosity of this VES fluid can be switched reversibly from low to high immediately by adjusting system pH value. Even at high shear rate (170 s−1) and high temperature (90 °C), excellent viscoelastic behavior of this VES fluid can be observed, which is a key performance for fracturing applications. Meanwhile, the recycled VES fluid can still maintain good pH-responsive behavior even after more than three cycles. These unique performances of this VES fluid not only enhanced our understanding of the transformation of wormlike micelles at high temperature, but also enriched a large potential of VES fracturing fluid in the development of oil and gas reservoirs. 相似文献
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随着勘探技术的发展,油气勘探向纵深发展,而越往深井发展地层温度越高,国内外对高温油藏的开发愈加重视。水基压裂液由于其施工方便、价格低廉以及性能优异等优点,一直是应用最为普遍的压裂液。但早期压裂液的耐温性能较差,无法满足高温油藏的压裂施工需求。因此开发可用于耐高温油气藏的水基压裂液具有重要的研究价值和实际应用价值。本文介绍了国内外耐高温水基压裂液的研究进展,对于胍胶压裂液,通过提高稠化剂用量,进行稠化剂、交联剂的改性,以提高其耐温性能;耐温清洁压裂液稠化剂类型由早期的阳离子、阴离子型向双子及复合型发展,近年还有学者将纳米体系用于改性表面活性剂;耐温合成聚合物压裂液发展较快,多是通过设计多元共聚物提升耐温能力。对于胍胶压裂液体系,研发满足特高温油藏压裂施工需求的低浓度胍胶压裂液还是今后的主要研究方向。文中指出清洁压裂液体系成本过高,无法大规模使用;合成聚合物压裂液耐温性能好,研究含有支链聚合单体或磺酸基团等的多元共聚物,引入合适的疏水基团作为稠化剂,是合成聚合物的研究方向。 相似文献
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Yuan Li Caili Dai Yining Wu Ke Xu Mingwei Zhao Yuhe Wang 《American Institute of Chemical Engineers》2020,66(6):e16229
We investigated the flow of viscoelastic surfactant (VES) solutions, an important type of fracturing fluids for unconventional hydrocarbon recovery, through a diverging–converging microfluidic channel that mimics realistic unit in porous media. Newtonian fluid and viscoelastic hydrolyzed polyacrylamide (HPAM) solution were used as control groups. We vary Deborah numbers (De) up to 61.2, and found that the flow patterns of HPAM and VES solutions become very different once De ≥ 6.12. This is attributed to different generation mechanisms of viscoelasticity, thus different responses to extensional rates at pore-throats, for HPAM and VES solutions. It results in significantly smaller pressure drop of VES solutions through the microchannel compared to HPAM solution. It interprets higher filtration loss of VES solution than HPAM in core experiments and in field observations. The set-up can be generalized as a prototype to effectively evaluate the filtration of fracturing fluids. 相似文献