【摘要】 为了精细描述致密高含水气藏不同液气比气井生产特征，明确气井递减类型和递减规律，以鄂尔多斯盆地东胜气田锦30井区为研究对象，基于传统的Arps递减分析法，将气井日产气量、稳定液气比、动态储量等动态属性作为分类标准，探究致密高含水气藏递减规律和气井合理配产，并通过地质参数组合引入拟采气强度公式建立标准递减曲线，辅助指导气井全生命周期管理。研究结果表明：(1)高产气井主要分布在该井区储层物性及含气性较好的4～6号河道北部，中产气井主要分布在5号河道中部和6号、7号河道北部，低产气井分布在储层致密的6号、7号河道南部和含水饱和度高的3号河道。(2)气井产量递减规律研究结果表明，不同液气比条件下气井产量递减类型和递减率差异较大，中低含水气井递减类型为衰竭—双曲与指数—双曲递减，高含水气井递减类型为指数—调和与指数—衰竭递减；相同产水条件下，低产气井产量递减率最大，高产气井产量递减率最小。(3)数值模拟结果表明，中低含水气井合理配产比例为（1 7～1 6）天然气无阻流量，高含水气井合理配产比例为（1 6～1 5）天然气无阻流量。(4)气井生产实例表明，拟采气强度公式在一定程度上能够消除非均质性、含气性、储层厚度及压裂改造规模等因素对气井生产效果的影响，指导气井生产管理。结论认为，该项研究成果可用于指导气井工作制度优化和评价气井挖潜潜力，也可以为同类型气藏产量递减分析提供参考和借鉴。更多还原

【Abstract】 Jin 30 well block in Dongheng gasfield was taken as an objective to conduct fine description on the production performance in gas wells with different liquid-gas ratio in tight gas reservoirs rich in water and further to figure out both decline types and laws in such wells. Moreover, taken the daily gas production, stable liquid-gas ratio and dynamic reserves as classification criteria, not only the decline laws in these tight gas reservoirs with rich water but also rational proration in gas wells were explored deeply through the traditional Arps decline analysis method. And a standard decline model was established by introducing the pseudo production intensity formula to assist in guiding gas wells in the proration optimization and lifecycle management. Results show that(i) high-yield wells are mainly situated in the north of channels 4 to 6 with better reservoir properties, medium-yield ones in the middle of channel5, the north of channels 6 and 7, and low-yield gas block in the south of channels 6 and 7 and channel 3 with high water;(ii) decline laws in gas wells with different liquid-gas ratio vary significantly. Decline types in those wells with low to medium water are depletion-hyperbolic and exponential-hyperbolic decline, while types of high water are exponential-harmonic and exponential-depletion decline. Under the same water production, the decline rate in low-yield wells is the largest while the smallest for that of high-yield ones;(iii) from numerical simulation, rational proration ratio in low medium water gas wells is 1/7～1/6 open-flow capacity, and that of high water wells is 1/6～1/5 open-flow capacity, individually; and(iv) from the production, the pseudo gas-production intensity formula can eliminate the influence of strong heterogeneity, gas content, reservoir thickness and fracturing scale on production effect to a certain extent, guiding the production and management for gas wells. It is concluded that these achievements may not only guide to optimize the working system and evaluate the tapping potential in gas wells, but also provide reference for analyzing decline laws in the same type of gas reservoirs.更多还原