深水水驱气藏高效开发技术研究

Research on Efficient Development Technology of Deep Water Drive Gas Reservoir

如何高效开发深水水驱气藏是深水A气田开发过程中的研究重点。为摸清高渗–特高渗水驱气藏水侵特征,开展了微观水侵机理和宏观见水规律物理模拟。高渗水驱气藏存在“临界速度”,若驱替速度大于该临界速度则发生水窜,导致驱替效率降低;水平井开发驱气藏,同时配以合理采气速度,可有效延缓见水时间。采用数模法模拟了不同地质条件及开发参数对水驱气藏开发效果影响,对深水A气田进行聚类差异分析,制定各井区合理采气速度3%~5%。研究结果表明,该方法延缓了气井见水时间,使气田投产以来生产稳定,年供气30亿方,稳产10年,提高了气田开发效果。该项研究成果为后续深水气田开发提供了有效的技术支持,具有较好的推广应用价值。

How to efficiently develop the deep water drive gas reservoir is the research focus in the development of deep water A gas field.In order to understand the water influx characteristics of high permeability to ultra-high permeability water drive gas reservoirs,carried out physical simulation of micro water invasion mechanism and macro physical simulation of water breakthrough.There is a"critical velocity"in high permeability water drive gas reservoir.If the displacement velocity is greater than the critical velocity,water channeling will occur,resulting in the reduction of displacement efficiency.Horizontal well development of water drive gas reservoir and reasonable gas production rate can effectively delay the water appearance time.At the same time,the influence of different geological conditions and development parameters on the development effect of water drive gas reservoir is simulated by the numerical simulation method.Based on this,the cluster difference analysis of deep water A gas field is carried out,and the reasonable gas production rate of each well area is determined to be 3%-5%,which delayed the water appearance time of gas wells.Since the gas field is put into operation,the production has been stable,with an annual gas supply of 3 billion m3 and a stable production of 10 years,which improves the gas field development effect.The research results provide effective technical support for the subsequent development of deep water gas fields and have good promotion and application value.