东海强底水气藏电泵排水采气措施效果评价

借鉴油藏成功经验，近年来电泵排水采气措施开始在海上强底水气藏推广应用，评价落实措施效果，有助于明确措施适用性，为该类气藏针对性控水、治水提供重要依据。该文以东海X1气井为例，基于措施后气井生产指标评价，应用气藏工程及数值模拟方法，研究了强底水气藏电泵排采后水侵、气水界面、无因次采气能力变化特征，明确了措施不见效原因。研究结果表明：电泵排采措施对于强底水气藏并不适用，该类气藏水体活跃，水驱前缘不稳定，单井点高强度排液无法阻止底水推进，反而因生产压差过大，引起水侵加剧、气水界面失衡，造成潜力区域过快水淹。该井实践认识可为同类气藏合理选择排水采气措施提供一定指导。

Drawing on the successful experience of oil reservoirs, in recent years, the electric pump drainage and gas production measures have been promoted and applied in offshore strong bottom water gas reservoirs. Evaluating the effect of implementing measures is helpful to clarify the applicability of measures and provide an important basis for targeted water control and control of such gas reservoirs. Taking the X1 gas well in East China Sea as an example, based on the evaluation of the production indicators after measures, the gas reservoir engineering and numerical simulation methods were used to study the change characteristics of water invasion, gas-water interface and dimensionless gas production capacity after the electric pump drainage in strong bottom water gas reservoirs, and the reasons for ineffective measures were clarified. The results indicate that the electric pump drainage measures are not suitable for strong bottom water gas reservoirs. The water body of this kind of gas reservoir is active, the water drive front is unstable, and the high-intensity drainage at single well point cannot prevent the bottom water from advancing. However, due to the large production pressure difference, the water invasion is intensified, the gas-water interface is unbalanced, and the potential area is flooded quickly. The practical understanding of this well can provide certain guidance for the rational selection of drainage and gas production measures for similar gas reservoirs.