新疆石油地质

›› 2013, Vol. 34 ›› Issue (1): 1-1.

• 论文 •    

高含CO2天然气相变及其物性参数实验测试

卞小强，杜志敏   

  1. (西南石油大学 油气藏地质及开发工程国家重点实验室,成都 610500)
  • 出版日期:2019-01-01 发布日期:1905-07-09

Experimental Study on the Phase Behavior and Fluid Physical Parameters of High CO2Content Natural Gas

BIAN Xiaoqiang, DU Zhimin   

  1. (State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China)
  • Online:2019-01-01 Published:1905-07-09

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摘要： 实验确定高含CO2天然气从地层到井口是否发生相变以及准确测试高含CO2天然气的物性参数是安全高效开发该类气田的基础研究内容之一。用加拿大DBR公司的JEFRI相态分析仪，测试了高含CO2天然气从地层到井口的相态变化特征和高含CO2天然气的物性参数（偏差系数、体积系数、压缩系数、密度）。实验结果表明：在实验范围内，高含CO2天然气不发生相变；随着压力增加，气体偏差因子先减小后增大（最小值出现在15 MPa左右），体积系数和压缩系数均减小（低压下减小的幅度大于高压），密度增加；随着CO2含量的增加，气体偏差因子减小，密度增加且高压下增加的幅度较低压下明显，体积系数和压缩系数均无明显变化；随着温度的升高，气体偏差因子增大且在15 MPa左右变化幅度最大，体积系数增大且低压下增大的幅度较高压下明显，密度降低且高压下降低的幅度较低压下明显，压缩系数影响很小。

Abstract: The JEFRI?PVT apparatus from DBR Company of Canada was used to test the phase transition from well bottom to well head and the physical parameters of high CO2 ? bearing natural gas, such as compressibility factor (Z?factor), formation volume factor (FVF), compressibility, and density. The experimental results show that no phase transition can be defined at experimental ranges, and with pressure rising, the Z?factor decreases and then increase(the minimal value appears at about 15 MPa), the density rises and both FVF and compressibility decrease (the decreasing amplitude at low pressure is larger than that at high pressure);with CO2 content increasing, the Z?factor decreases and the density increases (the increasing amplitude at high pressure is more obvious than that at low pressure), and both FVF and compressibility have little change; with temperature rising, the Z?factor increases (the biggest change arrives at about 15 MPa), the FVF rises(the increasing amplitude at low pressure is more obvious than that at high pressure), the density decreases (the decreasing amplitude at high pressure is more obvious than that at low pressure), and compressibility has little change

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