CO_2气藏偏差因子计算模型评价  

Evaluating calculation methods of Z-factor for CO_2 gas reservoir

作　　者：陈亮[1] 孙雷[2] 

机构地区：[1]中国石油新疆油田分公司,新疆克拉玛依834000 [2]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500

出　　处：《复杂油气藏》2014年第2期57-60,共4页Complex Hydrocarbon Reservoirs

摘　　要：应用常规酸性气体偏差因子计算模型,结合Key’s、SBV及RK混合准则和酸性气体临界参数校正方法,计算CO2气藏偏差因子,并与实验测定值对比,评价适合CO2气藏偏差因子计算的模型。研究表明:BB经验公式对CO2气藏偏差因子计算适应性最强,误差小于3%,满足工程计算要求;常规酸性气体临界参数校正方法,很难改善CO2气藏偏差因子计算精度。各种模型中,RK+WA精度最高,SBV+CKB误差最大。当压力>35 MPa时,各种经验公式计算误差相应增大,但BB+SBV模型精度仍然很高,其中,BB+SBV未校正模型在42.34 MPa时,误差仅2.64%,适合高压CO2气藏偏差因子计算。Combined with the mixed criteria of Key＇ s, SBV, and RK, and the critical parameter calibration method, the Z -factors were calculated by the conventional calculation models of sour gas. Compared with the experimental results, it was evaluated that the model was suitable for calculating Z - factor of CO2 gas reservoir. The study results indicated that with the error less than 3% ,BB empirical formula was highly adapted to calculating the Z -factor for CO2 gas reservoir, and can meet the engineering computing requirements ;it was difficult to improve the Z - factor＇ s calculation accuracy by using the critical parameter calibration method for conventional sour gas ;for all the models, the highest precision was RK ＋ WA model, and the maximum error was SBV ＋ CKB model;for all the empirical formula calculations, if the pressure is greater than 35 MPa, the error will increase accordingly, but the BB ＋ SBV model was still with high precision. Especially, when the pressure equaled 42.34 MPa,the error of BB ＋ SBV uncorrected model was only 2.64%. So it was suitable to calculate the Z - factor for high pressure CO2 gas reservoir.

关 键 词：CO2气藏 偏差因子 理论计算 模型评价 

分 类 号：TE375[石油与天然气工程—油气田开发工程]