特种油气藏 ›› 2022, Vol. 29 ›› Issue (5): 132-138.DOI: 10.3969/j.issn.1006-6535.2022.05.019

• 油藏工程 • 上一篇    下一篇

高压含蜡凝析气析蜡点实验测试方法及应用

谢泱1, 刘建仪2,3, 汪春浦1   

  1. 1.中国石油川庆钻探工程公司,四川 成都 610051;
    2.西南石油大学,四川 成都 610500;
    3.油气藏地质及开发工程国家重点实验室,四川 成都 610500
  • 收稿日期:2021-10-28 修回日期:2022-07-15 发布日期:2023-01-10
  • 作者简介:谢泱(1994—),男,助理工程师,2018年毕业于西南石油大学海洋油气工程专业,2021年毕业于该校石油与天然气工程专业,获硕士学位,现主要从事油气藏开发与相态方面的研究。
  • 基金资助:
    中国石油川庆钻探工程有限公司科技项目“苏里格致密砂岩气藏剩余气刻画及挖潜技术研究”(CQ2021B-36-Z3-1)

Experimental Test Method and Application of High-Pressure Wax-Bearing Condensate Gas Wax Precipitation Point

Xie Yang1, Liu Jianyi2,3, Wang Chunpu1   

  1. 1. CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu, Sichuan 610051, China;
    2. Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    3. State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering, Chengdu, Sichuan 610500, China
  • Received:2021-10-28 Revised:2022-07-15 Published:2023-01-10

摘要: 针对高压含蜡凝析气在气相状态下析蜡点测试准确率低的问题,在优选黏温曲线法、差示扫描量热法、偏光显微镜法的基础上,研制了一套基于偏光显微镜法的高压可视化流体相变观测装置,对不同压力下含蜡凝析气井流物与含气油的析蜡点规律进行实验研究。结果表明:偏光显微镜法测得的析蜡点较黏温曲线法与差示扫描量热法更准确;新研制的高压可视化流体相变观测装置可准确测试含蜡凝析气井流物与含气油的析蜡点;含蜡凝析气井流物的析蜡点随压力增加,先降低再升高,经过露点后又降低,且析蜡线将井流物析蜡相图分为单一气相、气-液两相、气-固两相以及气-液-固三相4个部分;含气油的析蜡点随压力增加先降低,当压力增加至饱和压力后析蜡点开始呈线性上升趋势。该研究结果为高压含蜡凝析气析蜡点准确测试提供了新方法。

关键词: 含蜡凝析气, 相态, 析蜡点, 偏光显微镜, 高压气藏

Abstract: To address the problem of low accuracy of wax precipitation point testing of high-pressure wax-bearing condensate gas in the gas phase, a set of high-pressure visualized fluid phase change observation device based on polarized light microscopy method was developed with reference to the preferred viscosity-temperature curve method, differential scanning calorimetry method and polarized light microscopy method to experimentally study on the wax precipitation point law of the wax-bearing condensate gas well fluid and gas-bearing oil under different pressures. The result shows: The wax precipitation point measured by polarized light microscopy method is more accurate than that by the viscosity-temperature curve method and differential scanning calorimetry method. The newly developed high-pressure visualized fluid phase change observation device can accurately test the wax precipitation point of wax-bearing condensate gas well fluid and gas-bearing oil. The wax precipitation point of the wax-bearing condensate gas well fluid first decreases and then increases with the increase of pressure, and then decreases after passing the dew point, and the wax precipitation line divides the well fluid wax precipitation phase diagram into such four parts as the single gas phase, gas-liquid phase, gas-solid phase and gas-liquid-solid phase; the wax precipitation point of gas-bearing oil first decreases with the increase of pressure, and begins to increase linearly when the pressure increases to the saturation pressure. The research results provide a new method for accurate test of the wax precipitation point of high-pressure wax-bearing condensate gas.

Key words: wax-bearing condensate gas, phase state, wax precipitation point, polarized light microscope, high-pressure gas reservoir

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