超高压高CO气藏偏差系数图版扩展与应用

The Expansion and Application of Deviation Factor Chart of Super-high Pressure and High CO Gas Reservoir

鲁瑞彬 王雯娟 张乔良 胡琳 陈健

LU Ruibin WANG Wenjuan ZHANG Qiaoliang HU Lin CHEN Jian

中海石油(中国)有限公司湛江分公司, 广东 湛江 524057

Zhanjiang Branch, CNOOC China Limited, Zhanjiang, Guangdong 524057, China

Standing-Katz图版法确定天然气偏差系数是目前最常用、最基础的方法之一，但存在人工读值误差大、在超高压（拟对比压力大于15）和高CO含量天然气使用受限等问题。设计单组分偏差系数测定实验，结合Standing-Katz图版曲线变化规律，将图版拟对比压力扩展到30，拟对比温度扩展到3.6，并将图版数字化；基于不同CO含量偏差系数测定实验结果，推导了考虑不同CO含量的天然气拟临界压力、拟临界温度计算新模型，与常规非烃校正模型相比，新模型计算精度更高，适用范围更广。进一步将新临界参数校正模型嵌入到偏差系数扩展图版中，得到不同CO含量的偏差系数扩展图版，该图版在南海西部超高温高压、高CO含量天然气偏差系数计算中误差较小（不超过3%），应用效果良好。

Standing-Katz plate is one of the most common and basic methods to determine the deviation factor of natural gas. However, there are some problems, such as large error in manual reading, limited use of natural gas with super-high pressure (>15) and high CO content. We design a single component deviation factor measurement experiment, and combined with the changing rule of the curve of the Standing-Katz plate, expand the to 30, the to 3.6, and digitize the plate. Through different CO content deviation factor tests, and a new calculation model of pseudo critical pressure and pseudo critical temperature of natural gas considering different CO content is derived. Compared with the conventional non-hydrocarbon correction model, the new model has higher calculation accuracy and wider application range. Furthermore, the new correction model is embedded in the deviation factor expansion chart, and the software is used. The deviation factor expansion chart considering different CO content has a smaller error (≤3 %) in the calculation of the deviation factor of HTHP and high CO content natural gas in the west of South China Sea, and the application effect is better.

10.11885/j.issn.1674-5086.2020.06.13.01