JOS凝析气藏蜡沉积实验及防蜡剂研究
发布时间：2018-11-24 10:40
【摘要】：石油生产和运输中的石蜡沉积,使油流通道缩小,生产油管的输送能力大大降低,导致油气井产量下降甚至停产,严重影响正常生产。JOS凝析气藏气井井筒蜡堵严重,清蜡周期频繁,机械清蜡风险大、常规热洗效率低、井筒处理周期长,为此急需进行清防蜡技术研究,保证JOS凝析气藏顺利开采。 本文在分析JOS凝析气藏气井结蜡情况的基础上,对石蜡沉积理论进行了充分调研,并开展了蜡沉积实验研究,研制和评价了一种适用于该气藏气井的新型防蜡剂。取得的认识如下： (1)通过对JOS凝析气井油样化学组成、色谱分析、红外光谱测试结果表明,JOS凝析油样均含石蜡基团,蜡含量高,重质组分碳数及含量高,其中S2井油样C40+以上重质组分含量达8.986wt%,异构烷烃含量高,油中石蜡以微晶蜡为主,给油蜡的防治造成极大困难。 (2)提出了采用化学蒸馏、X衍射、扫描电镜、红外光谱、DSC测试、色谱分析、模拟蒸馏等综合测试手段研究沉积堵塞物。研究表明JOS沉积堵塞物析蜡点达82℃,堵塞物中石蜡析蜡点达87℃,组成物质主要为高熔点、高碳数、高析蜡点的微晶蜡,少量胶质、沥青质以及极少的矿物质,有机溶剂与一般清防蜡剂在常温下均难溶解。 (3)通过高压条件下JOS气井油样的蜡沉积测试表明,JOS油样析蜡点高,析蜡量大,J1、S2在常压下析蜡点分别为42.9℃、45.6℃；脱气油的析蜡点和析蜡量随压力增加而升高和增加；活油测试表明在饱和压力处析蜡点最低、析蜡量最少。 (4)针对JOS堵塞物含大量支链微晶蜡、蜡晶熔点高的特点,研发了新型油溶性防蜡剂PT-11,防蜡效果明显优于其他防蜡剂。优化后的防蜡剂配方为主剂VE：降凝剂A：分散剂B=1：6：1,合理浓度为1%。PT-11的静态防蜡率达90.1%,凝固点降低20-C左右。PT-11同时具有降黏、降凝等作用。
[Abstract]:The paraffin deposition in oil production and transportation reduces the channel of oil flow and greatly reduces the transportation capacity of production tubing, which leads to the decline of oil and gas production and even the shutdown of oil and gas production, which seriously affects the normal production. The wax plugging in gas well bore of JOS condensate gas reservoir is serious. The waxing cycle is frequent, the risk of mechanical wax removal is large, the conventional hot washing efficiency is low, and the wellbore treatment period is long. Therefore, it is urgent to study the wax-cleaning and anti-wax technology to ensure the smooth exploitation of JOS condensate gas reservoir. Based on the analysis of wax deposition in gas wells of JOS condensate gas reservoir, the theory of paraffin deposition is investigated, the experimental study of wax deposition is carried out, and a new waxproof agent suitable for gas wells in JOS gas reservoir is developed and evaluated. The results obtained are as follows: (1) the chemical composition, chromatographic analysis and infrared spectrum of the JOS condensate well oil samples show that the JOS condensate oil samples all contain paraffin groups, high wax content, high carbon number and content of heavy components. The content of heavy components above C 40 in oil samples of S 2 well is 8.986 wt, the content of iso-alkanes is high, the paraffin in oil is mainly microcrystalline wax, the prevention and cure of oil wax supply is very difficult. (2) Chemical distillation, X-ray diffraction, scanning electron microscope, infrared spectrum, DSC test, chromatographic analysis, simulated distillation and so on are used to study the deposition blockage. The results show that the wax point of JOS deposition blockage is 82 鈩，
本文编号：2353379
[Abstract]:The paraffin deposition in oil production and transportation reduces the channel of oil flow and greatly reduces the transportation capacity of production tubing, which leads to the decline of oil and gas production and even the shutdown of oil and gas production, which seriously affects the normal production. The wax plugging in gas well bore of JOS condensate gas reservoir is serious. The waxing cycle is frequent, the risk of mechanical wax removal is large, the conventional hot washing efficiency is low, and the wellbore treatment period is long. Therefore, it is urgent to study the wax-cleaning and anti-wax technology to ensure the smooth exploitation of JOS condensate gas reservoir. Based on the analysis of wax deposition in gas wells of JOS condensate gas reservoir, the theory of paraffin deposition is investigated, the experimental study of wax deposition is carried out, and a new waxproof agent suitable for gas wells in JOS gas reservoir is developed and evaluated. The results obtained are as follows: (1) the chemical composition, chromatographic analysis and infrared spectrum of the JOS condensate well oil samples show that the JOS condensate oil samples all contain paraffin groups, high wax content, high carbon number and content of heavy components. The content of heavy components above C 40 in oil samples of S 2 well is 8.986 wt, the content of iso-alkanes is high, the paraffin in oil is mainly microcrystalline wax, the prevention and cure of oil wax supply is very difficult. (2) Chemical distillation, X-ray diffraction, scanning electron microscope, infrared spectrum, DSC test, chromatographic analysis, simulated distillation and so on are used to study the deposition blockage. The results show that the wax point of JOS deposition blockage is 82 鈩，
本文编号：2353379
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