渤海异常高压凝析气藏产能评价模型建立及应用

Construction and application of a deliverability analysis model in Bohai surpressured condensate gas reservoir

常规二项式方程在计算凝析气藏产能时,未考虑储层压敏效应、测试过程中工作液及凝析油的污染等因素,导致计算结果偏乐观,特别是对异常高压带裂缝的低渗透凝析气藏,常规二项式计算的结果偏差将更大。因此,本文基于渤海B气藏(高含凝析油)的测试结果,考虑储层压敏效应、测试过程中工作液和凝析油等液相的影响,推导出了改进的二项式方程,建立了渤海异常高压凝析气藏产能评价模型,并将研究成果应用于渤海B气藏。研究结果表明,改进的气井产能评价模型计算精度高,适用性好。

The influence of the pressure sensitive effect and the reservoir pollution by the working fluid and condensate oil throughout testing were not considered when the deliverability of surpressured condensate gas reservoir was calculated using the conventional binomial equation, which caused the deviation of the calculation result.The greater deviation coulded be caused in Bohai surpressured condensate gas reservoir. Based on the test result of Bohai B gas reservoir, considering the influence of the pressure sensitive effect and the reservoir pollution by the working fluid and condensate oil throughout testing, improved binomial equation were discussed, the deliverability analysis model in Bohai surpressured condensate gas reservoir was built. The research results were applied to Bohai B gas reservoir.The results showed that the calculation precision of improved deliverability analysis model was higher than the old one, which has a better applicability in Bohai surpressured condensate gas reservoir.