致密砂岩和煤岩互层气藏渗流规律研究

发布时间：2018-03-18 04:25

本文选题：互层气藏　切入点：煤层气　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：鄂尔多斯盆地东缘神府—临兴区块勘探表明该地区同时存在煤层气和致密气,但煤层和致密砂岩层的储层厚度较薄、接触关系复杂、单层产能较低,需要进行"煤-致"合采以形成压力扰动,增大气井产能。而煤层和致密砂岩层具有不同的储集状态、岩石性质、渗流能力以及开发方式。因此,需要针对煤层和致密砂岩层在不同接触关系下的气水流动规律、压力分布规律、产能干扰规律、层间接替规律以及井筒耦合规律进行研究。本文在分析神府—临兴地区煤层和致密砂岩层接触关系的基础上,建立了"煤-致"直接接触、"煤-致"间接接触以及"煤-致"无接触的三种简化接触地质模型以及数值模型。并采用机理分析及数值模拟两种方法针对三种接触模型中煤层或致密砂岩层单独开采及"煤-致"合采过程中的层间干扰规律进行了研究:通过对比"煤-致"互层气藏在不同接触关系下的气水流动状态、层间压力分布以及储层产能大小关系,确定了"煤-致"互层气藏的层间干扰原理、层间干扰时间以及层间干扰强度;同时针对"煤-致"互层气藏不同的接触模式设计了不同的层间接替开发方案,通过数值模拟方法确定了在不同层间干扰模式下的最佳开发方式;同时针对"煤-致"合采时井筒排水量与储层产水量之间的关系进行了耦合研究,提出了排水量与储层产水量之间的耦合关系模型,同时采用矿场数据和数值模拟方法进行了实例对比验证分析。研究认为,鄂尔多斯盆地东缘神府-临兴区块煤层和致密砂岩层在不同的接触关系下进行多层合采或单采某一层时,储层中的水和气体在自身重力、浮力以及压力的共同作用下移动,对互层气藏的压力和气井的产能产生干扰,且不同的"煤-致"接触关系具有不同干扰模式以及干扰强度。同时,由于井筒储集效应的存在,井筒排水量不一定等于煤层和致密砂岩层的产水量,需要根据井筒动液面的状态进行耦合分析。本次研究为神府-临兴区块今后的开发,产能接替方案的设计提供了可靠的理论依据,也为类似的气藏开发提供了借鉴。
[Abstract]:The exploration of Shenfu-Linxing block in the eastern margin of Ordos Basin shows that both coalbed gas and dense gas exist in this area, but the reservoir thickness of coal seam and tight sandstone layer is thinner, the contact relation is complex, and the single layer productivity is low. "Coal-induced" combined production is needed to form pressure disturbance and increase gas well productivity. Coal seam and tight sandstone have different reservoir states, rock properties, percolation capacity and development methods. In view of the gas-water flow law, pressure distribution law and productivity disturbance law of coal seam and tight sandstone under different contact relations, Based on the analysis of the contact relationship between coal seam and tight sandstone in Shenfu-Linxing area, the interlayer succession law and wellbore coupling law are studied in this paper. Three kinds of simplified contact geological models and numerical models of direct contact, indirect contact and non-contact are established. The mechanism analysis and numerical simulation are used to analyze the three kinds of contact. In the contact model, the interlayer interference law in the process of coal seam or tight sandstone mining and "coal-induced" combined mining is studied: by comparing the gas-water flow state of "coal-induced" interbedded gas reservoir under different contact relations, The interlayer interference principle, interlayer interference time and interlayer interference intensity of "coal-induced" interbedded gas reservoir are determined by the relationship between interlayer pressure distribution and reservoir productivity. At the same time, according to the different contact mode of "coal-induced" interbedded gas reservoir, different plans of interlayer replacement development are designed, and the optimal development mode under different interlayer interference mode is determined by numerical simulation method. At the same time, the coupling relationship between wellbore displacement and reservoir water production is studied, and the coupling relationship model between displacement and reservoir water production is put forward. At the same time, the field data and numerical simulation method are used to verify and analyze the examples. When the coal seam and tight sandstone layer in Shenfu-Linxing block in the eastern margin of Ordos Basin are produced by multi-layer combined production or single production under different contact relations, the water and gas in the reservoir move under the combined action of gravity, buoyancy and pressure. It interferes with the pressure of interbed gas reservoir and the productivity of gas well, and different "coal-induced" contact relations have different interference modes and interference intensity. At the same time, due to the existence of wellbore reservoir effect, Wellbore displacement is not necessarily equal to the water production of coal seams and tight sandstone beds. It needs to be coupled according to the dynamic liquid level of the wellbore. This study is for the future development of Shenfu-Linxing block. The design of productivity replacement scheme provides a reliable theoretical basis and a reference for similar gas reservoir development.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE312

【相似文献】