凝析气藏工业气流影响因素分析

Analysis on Influence Factors of Commercial Gas Flow in Condensate Gas Reservoir

凝析气藏在气田开发中占有重要地位,具有较高的经济价值。严格执行工业气流标准是确保气藏地质储量具有开发效益的前提,而DZ/T0217—2005《石油天然气储量计算规范》没有明显体现凝析油对凝析气藏工业气流的影响。根据凝析气藏工业气流计算模型,以西部某凝析气藏各项参数情况为例,定量分析了各种因素对凝析气藏工业气流的影响。结果表明:①与干气藏相比,凝析气藏的工业气流还受凝析油价格、凝析油含量和轻烃回收费的影响;②凝析气藏的工业气流随天然气价格、凝析油价格、凝析油含量的增加而减小,随气藏埋藏深度、轻烃回收费、递减率的增加而增加;③最敏感因素是气藏埋藏深度,其次是天然气价格、凝析油价格和凝析油含量,轻烃回收费和递减率的变化影响较小。本文提出的方法也适用于含硫化氢等复杂成分气藏工业气流的影响因素分析。

Condensate gas reservoir has the important role in gas field production with high economic value. Rigorously enforcing commercial gas flow standard is the premise of ensuring production benefit of the geologic reserves in the gas reservoir,but DZ/T 0217-2005 Specifications of Oil and Gas Reserves Calculation can＇t reflect the effect of the condensate oil on the commercial gas flow in the condensate gas reservoir. Based on the computational mode of the commercial gas flow in the condensate gas reservoir,each factor affecting the commercial gas flow is analyzed quantitatively in certain western condensate gas reservoir.The results show：（1）compared with dry gas reservoir,the commercial gas flow in the condensate gas reservoir is in-fluenced by price,content of the condensate oil and light ends fee also; （2）the commercial gas flow in the condensate gas reservoir decreased with the increase of natural gas price, condensate oil price and condensate oil content,and increased with the increase of burial depth of the gas reservoir,light ends fee and decline rate; （3）the most sensitive factor is the burial depth of the gas reservoir,and the more ones are natural gas price ,condensate oil price and condensate oil content,and the less ones are light ends fee and decline rate. The method proposed in this paper is also available to analysis on influence factors of the commercial gas flow in the gas reservoir with sulfurous and other complex components.