Q气田M区块下古气藏增压开采效果分析

Analysis of Pressurization Mining Effect of Lower Paleo-Gas Reservoir in M Block of Q Gas Field

摘要: Q气田M区块下古气藏是非均质性强的深层大型定容气藏，已面临产量递减的问题。为了维持稳定生产并提高采出程度，在该气藏中开展了增压开采。本文针对不同类型气井进行研究，结合增压前后生产数据，利用气井增压前后的产气量、稳产期、产量递减率、压力递减率、二次产层贡献率、动态储量和气井产能评价等指标，评估了增压开采对Q气田M区块下古生界气藏气井的影响。结果表明，气藏增压开采后，油压下降，产量上升，稳产期达2.6年，稳产期内产量增幅11.6%，气井产能指数倍比为1.03~1.16。各指标均表明M区块下古气藏增压开采效果良好。

Abstract: The lower paleo-gas reservoir in M block of Qin Q gas field is a deep large constant volume gas reservoir with strong heterogeneity, which has been faced with the problem of production decline. In order to maintain stable production and improve the degree of recovery, pressurized mining was carried out in the gas reservoir. In this paper, different types of gas wells are studied. Combined with the production data before and after pressurization, the gas production, stable production period, production decline rate, pressure decline rate, contribution rate of secondary production layer, dynamic reserves and gas well productivity evaluation before and after pressurization are used to evaluate the effect of pressurization on the lower Paleozoic gas wells in M block of Q gas field. The results show that after the pressurized gas reservoir exploitation, the oil pressure decreases and the production increases. The stable production period is 2.6 years, and the production during the stable production period increases by 11.6%. The gas well productivity index ratio is 1.03~1.16. All indicators show that the pressurized mining effect of the ancient gas reservoir in the M block is good.