大牛地气田2014年投产水平井稳产至今,并未出现明显的产能递减,其递减规律和以往历年投产井的结果及国内外同类气藏的开发结果出现明显差异。对这一部分水平井和之前历年投产井进行了对比分析,并将其稳产原因分为地质原因、工程原因和管理原因3大类。其中地质原因包括储层产水、水平井钻遇砂岩长度和储层生烃强度等因素;工程原因主要指压裂设计和施工的因素;管理原因主要包括排水采气思路和配产思路的转变。研究结果表明:产水对致密气藏气井生产具有控制作用,产水量越低,气井越容易稳产。气测显示砂岩长度和储层生烃强度越高,越有利于气井稳产。压裂规模越大、返排率越高,越有利于气井稳产。对于高含水致密气藏来说,排水是开发第一要务,应确立“排水和采气同等重要、同步进行”的整体开发思路。在保证排水的情况下降低配产比例,可以有效降低投产初期储层压降速率,更有利于气井的稳产。同时提出,对于致密气藏来说高效开发关键在于科学管理,“低产气+高产水≠无法稳产”。通过对地质条件认识的深化、通过钻井和压裂等工程工艺的改进,通过开发思路的优化调整,同样可以在高含水致密气藏中做到气井的长期稳产。 Since the Daniudi Gas Field went into operation in 2014, the horizontal well has been steadily producing so far, no obvious decrease in production capacity has occurred. The declining law and the results of the previous well production wells and the development results of similar gas reservoirs at home and abroad show obvious differences. This part of the horizontal well and previous years, the production wells were compared and analyzed, and its causes of stable production is divided into geological reasons, engineering reasons and management of the three major categories. Among them, the geological causes include the factors such as water production in the reservoirs, the length of sandstone drilled in horizontal wells and the hydrocarbon generation intensity of reservoirs. The engineering reasons mainly refer to the factors of fracturing design and construction. The management reasons mainly include the change of drainage gas and production rationale . The results show that water production has a control effect on the production of gas wells in tight gas reservoirs. The lower the water production, the more stable the gas wells are. Gas measurements show that the higher the sandstone length and reservoir hydrocarbon generation intensity, the more conducive to stable gas wells. The larger the fracturing scale, the higher the backflow rate, the more conducive to stable gas wells. For high-water tight gas reservoirs, drainage is the top priority of development, and the overall development idea of ​​“equal importance of drainage and gas recovery” should be established. In the case of drainage to reduce the proportion of distribution, can effectively reduce the rate of pressure drop during the initial production reservoir, and more conducive to the stable production of gas wells. At the same time, it is proposed that the key to efficient development of tight gas reservoirs lies in scientific management, and “low-yield gas + high-yield water ≠ stable production”. Through deepening understanding of geological conditions, through the improvement of drilling and fracturing engineering processes and through the optimization and adjustment of development ideas, it is also possible to achieve long-term stable production of gas wells in high-water-tight gas reservoirs.