CO2-CH4 Gas Throttling and Hydrate Generation Characteristics

doi:10.12388/j.issn.1673-2677.2024.01.008

Abstract

Abstract:

In the process of CO₂ flooding production and oil lifting，with the decrease of pressure，a large amount of associated gas will be separated from the produced liquid. In the associated gas，the content of CO₂ is as high as 50%-90%. Compared with CH₄，gaseous CO₂ has a stronger throttling cooling effect，which may cause the generation of hydrate to block the pipeline，threatening the operation safety of the gathering and transportation system. The influence of CO₂ content on the CO₂-CH₄ gas throttling and hydrate generation characteristics was studied using a high-pressure sapphire reactor. The results show that：When the initial pressure is high （16 MPa），the throttling effect coefficient D_i of the mixture gas with the same CO₂ proportion is about 1.3-5.4 ℃/MPa，and the incorporation of CH₄ will enhance the throttling effect of the mixture gas，indicating that the high pressure section is mainly affected by the throttling effect of CH₄；when the initial pressure is low （5 MPa，4 MPa），the throttling effect coefficient D_i is about 3.4-11.9 ℃/MPa，and the incorporation of CH₄ will weaken the throttling effect of the mixture gas，indicating that the low pressure section is mainly affected by the throttling effect of gaseous CO₂. The higher the pressure at which CO₂-CH₄ gases with the same CO₂ content are，the higher the temperature at which hydrates are generated，and the easier it is to generate hydrates. At the same pressure，the lower the CO₂ content is，the lower the temperature at which hydrates are formed. When the CO₂ content is 8%-100% and the pressure is 1.5-5 MPa，the hydrate generation temperature is 0.5~10 ℃. The comparison results between the experimental and software simulation data show that the PR equation of state has a high correlation for the calculation of CO₂-CH₄ throttling and hydrate generation characteristics. The research results can provide a reference for the selection of safe gathering and transportation process parameters.

Key words:

CO₂-CH₄ , gas, throttling characteristic, hydrate, throttling effect coefficient, CCUS

摘要：

CO₂驱采油举升过程中，随着压力的降低，采出液会析出大量伴生气，伴生气中CO₂含量高达50%~90%，相比CH₄气体，气态CO₂节流致冷效应更强，引起的低温可能会生成水合物堵塞管道，威胁集输系统的运行安全。采用高压蓝宝石反应釜研究了CO₂含量对CO₂-CH₄气体节流及水合物生成特性的影响。结果表明：当初始压力为高压（16 MPa）时，相同CO₂占比的混合气体，节流效应系数D_i约为1.3~5.4 ℃/MPa，CH₄的掺入将增强混合气体节流效应，说明高压段主要受CH₄节流效应的影响；当初始压力为低压（5 MPa、4 MPa）时，节流效应系数D_i约为3.4~11.9 ℃/MPa，CH₄的掺入将减弱混合气体节流效应，说明低压段主要受气相CO₂节流效应的影响；相同CO₂含量的CO₂-CH₄气体所处压力越高，水合物生成的温度越高，越容易生成水合物；在相同压力下，CO₂含量越低，生成水合物温度越低；CO₂含量在8%~100%，压力在1.5~5 MPa，水合物生成温度为0.5~10 ℃。实验与软件模拟数据对比结果表明PR状态方程对CO₂-CH₄的节流及水合物生成特性计算具有较高的相关性。研究结果可为安全集输工艺参数的选择提供参考。

关键词:

CO₂-CH₄气体, 节流特性, 水合物, 节流效应系数, CCUS

CLC Number:

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XIONG Xiaoqin, AN Guoyu, LIAO Tao, LI Xinze.

CO₂-CH₄ Gas Throttling and Hydrate Generation Characteristics

[J]. Xinjiang Oil & Gas, 2024, 20(1): 61-67.

熊小琴, 安国钰, 廖涛, 李欣泽.

CO₂-CH₄气体节流及水合物生成特性

[J]. 新疆石油天然气, 2024, 20(1): 61-67.

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CO₂-CH₄ Gas Throttling and Hydrate Generation Characteristics

CO₂-CH₄气体节流及水合物生成特性

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