阿姆河右岸萨曼杰佩气田凝析油潜含量确定方法

土库曼斯坦阿姆河右岸萨曼杰佩气田第一天然气处理厂投产前几年,实际回收得到的商品凝析油产量与理论设计指标出现了重大偏离,合作方对此提出了严重质疑,要求中方给出科学合理的解释。为了准确测定该气田的凝析油潜含量和处理厂凝析油产量,根据气田的实际情况建立了流体取样技术规范和流体分析实验方法(以下简称新方法),据此测定气田井流物组成和凝析油潜含量,并采用新方法和俄罗斯方法对凝析油相关参数、凝析油潜含量进行了计算和对比分析。结果表明:(1)新方法要求天然气组分分析到C_(10)~+以及组分中的N_2、He、H_2、O_2+Ar、CO_2、H_2S,凝析油组分分析超过C_(30)~+;(2)按俄罗斯方法计算的凝析油潜含量为77.27 g/m~3,按中方新方法计算的凝析油潜含量为76.21 g/m~3,双方计算结果一致;(3)较之于其他老方法,新方法的精度更高、计算结果更加可靠。结论认为,新方法准确地确定了该气田的凝析油潜含量,解决了困扰中国石油阿姆河天然气公司在阿姆河右岸油气开发合作A区生产中的重大技术难题,为该公司A区扩能改造和B区气田开发方案设计、二期产能建设提供了重要的技术支持。

A determination method of potential condensate oil content of the Samandepe Gas Field,the Right Bank of the Amu Darya River of Turkmenistan

The actual condensate oil production rate was far lower than that in the theoretical design index in the first few years' production of No. 1 Production Plant of the Samandepe Gas Field, the Right Bank of the Amu Darya River of Turkmenistan, for that the partner raised serious questions about our side and required a scientific and reasonable explanation. To accurately determine the potential content of condensate oil in this field and the condensate oil production rate in this plant, we established technical codes for fluid sampling and test methodologies for fluid analysis, based on which we analyzed and determined the compositions of well fluid and condensate oil content in this field, and then the relevant parameters and potential content of condensate oil were calculated and compared by the Russian method and our newly-established method. The following results were demonstrated. (1) In the newly-established method, the compositions of natural gas are required to include C10+ and N2, He, H2, O2+Ar, CO2, and H2S and the components of condensate oil required to exceed C30+; (2) The condensate oil content of this field is calculated to be 77.27 g/m3 by the Russian method and 76.21 g/m3 by the new method, indicating that both methods have identical results; (3) Compared with the other old methods, this new method is of higher accuracy and the calculated results are more reliable. It is concluded that this new method can not only be used to determine the potential content of condensate oil in this field but solve the major technical issue perplexing Block A of the CNPC Turkmenistan Amu Darya Natural Gas Company. It also provides a robust technical support for the further production-expansion transformation of Block A and the next-step development design for Block B, and the productivity construction of Project Ⅱ.