压力和温度变化对超深层凝析气藏井筒积蜡的影响

IF 3.2 3区 工程技术 Q1 ENGINEERING, PETROLEUM
SPE Journal Pub Date : 2023-11-01 DOI:10.2118/218373-pa
Chao Zhang, Zihan Gu, Lihu Cao, Hongjun Wu, Jiquan Liu, Pengfei Li, Dexin Zhang, Zhaomin Li
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引用次数: 0

摘要

为研究超深层凝析气藏开发过程中凝析油蜡质析出机理,制备了凝析油样品。通过高温高压压力/体积/温度(PVT)系统模拟井筒中流体流动的温度和压力变化。模拟研究了它们对目标储层凝析油蜡沉淀的影响。结果表明:温度的降低削弱了蜡的分子运动活性,促进了蜡的析出,导致体系中蜡析出的压力范围扩大;同时,降低压力会增加蜡分子间的范德华力,从而促进蜡的聚集,从而提高蜡的析出速率。在不同温度下,随着压力的减小,蜡的析出量先增加后减少,这是由蜡在体系中的溶解度和残留量决定的。由于低碳数组分的溶解度比高碳数组分对温度和压力变化更敏感,因此在实验前期温度和压力降低时,碳数在C16 ~ C30之间的粗晶蜡的沉淀比碳数超过C30的微晶蜡的沉淀更活跃。前一组分在体系中的残留量迅速减少,其沉淀能力减弱,从而增加了实验后期沉淀蜡中后一组分的含量;这一趋势对应于蜡质碳数分布的曲线峰向碳数相对较高的横坐标区间偏移。该工作可为预测出蜡发生的井深及蜡成分提供参考数据,促进井筒防蜡堵漏方案的实施。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of Pressure and Temperature Variation on Wax Precipitation in the Wellbore of Ultradeep Gas Condensate Reservoirs
Summary To investigate the wax precipitation mechanism of condensate in a wellbore during the ultradeep gas condensate reservoir development, condensate samples were prepared in this work. Changes in the temperature and pressure of fluid flow in the wellbore are simulated by a high-temperature and high-pressure pressure/volume/temperature (PVT) system. This simulation explores their influences on the wax precipitation of the condensate produced from the target reservoir. The results show that the temperature decrease weakens the wax molecular movement activity and promotes the precipitation of wax, resulting in the expansion of the pressure range in which wax precipitation occurs in the system. Meanwhile, decreasing the pressure promotes wax aggregation by increasing van der Waals forces between wax molecules, thereby increasing the wax precipitation rate. At different temperatures, the wax precipitate amount first increases and then decreases with decreasing pressure, which is determined by the wax solubility and remaining content in the system. Since the solubility of a low carbon number component is more sensitive to temperature and pressure changes than that of a high carbon number component, in the early stages of experimental temperature and pressure decreases, the precipitation of coarse crystalline wax with carbon numbers ranging from C16 to C30 is more active than that of microcrystalline wax with carbon numbers exceeding C30. The remaining amount of the former component in the system decreases rapidly, and its precipitation capacity weakens, thus increasing the amount of the latter component in the precipitated wax during the later stage of experiments; this trend corresponds to the shift of the curve peak of the wax carbon number distribution to an abscissa interval with the relatively high carbon numbers. This work can provide reference data for the prediction of the well depth at which the wax precipitation occurs and the wax composition, aiming to promote the implementation of wellbore wax blockage prevention programs.
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来源期刊
SPE Journal
SPE Journal 工程技术-工程:石油
CiteScore
7.20
自引率
11.10%
发文量
229
审稿时长
4.5 months
期刊介绍: Covers theories and emerging concepts spanning all aspects of engineering for oil and gas exploration and production, including reservoir characterization, multiphase flow, drilling dynamics, well architecture, gas well deliverability, numerical simulation, enhanced oil recovery, CO2 sequestration, and benchmarking and performance indicators.
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