Chinese Institute of Coal Science
China Coal Research Institute
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University
College of Safety and Emergency Management Engineering, Taiyuan University of Technology

多压力系统气藏合采是提高叠置含气系统开发效率的重要举措之一，但特殊成藏背景导致合采效果并不理想，多压力系统气藏合采与高效开发机理是制约叠置含气系统高效勘探开发的关键科学问题。本文聚焦于多压力系统气藏合采，将合采物理模拟类型详细划分为煤层气和非煤层气两个领域进行单独阐述，从试验装置功能与特色、合采认识、存在问题等方面明确了多压力系统气藏合采物理模拟研究现状。首先，分析了现有物理模拟试验装置功能与特色，发现大尺度物理模拟试验装置可以很好的消除或弱化由并联岩心夹持器方式构建合采模型所带来的储层试样单一，监测数据手段和应力加载形式单一等问题，多压力系统合采物理模拟试验装置的发展方向应为真三维非均布复杂地应力状态下大尺度非均质多类型储层试样，相邻储层之间流体压力的传递特性、层间窜流行为以及多相态天然气共生等特性应该被考虑；在此基础上，深入总结了多压力系统合采效果对储层物性的敏感性，层间压差、渗透性、有效应力、含水饱和度等因素差异均有可能诱发合采流体干扰和储层产气伤害，优化合采制度可能是降低合采流体干扰和储层产气伤害的途径。综上分析认为，下一步研究应重点关注为探究低孔低渗、气水两相渗流、多相态天然气共生和多类型储层共存等诸多特性耦合对合采流体干扰诱导储层-井筒合采流场动态演化规律的影响，明确不同相态流体侵入对合采储层的储层伤害及其作用机理，揭示考虑合采流体干扰效应的层间窜流与井筒管流耦合流动特征。

The gas reservoirs co-production in multi-pressure system is one of the important measures to improve the development efficiency of the superposed gas-bearing systems. However, the co-production effect is not ideal due to the special reservoir forming background. The mechanism of co-production and high-efficient development of the multi-pressure system has become an key scientific problem, which restricts the efficient exploration and development of superposed gas-bearing systems. This paper focuses on the gas reservoirs co-production in multi-pressure system, and divides the physical simulation types of co-production into two separate fields: coalbed methane and non coalbed methane. It clarifies the current research status of gas reservoirs co-production in multi-pressure system from the aspects of device functions and characteristics, understanding of co-production, and existing problems. Firstly, the large-scale physical simulation test device can effectively eliminate or weaken the problems of homogeneous single-type reservoir samples, single monitoring data means and single stress loading form caused by paralleling multiple core grippers to build the physical simulation model. The development direction of the physical simulation for co-production in multi-pressure system should be to achieve true three-dimensional heterogeneous complex in-situ stress state of large-scale heterogeneous multi-type reservoir samples. The characteristics of fluid pressure transmission between adjacent reservoirs, the inter-layer crossflow, the multi-phase natural gas symbiosis should be considered. On this basis, the sensitivity of co-production of multi-pressure system to reservoir physical properties was deeply summarized. The differences in inter-layer pressure difference, permeability, effective stress, water saturation and other factors may induce the fluid interference and reservoir gas production damage, and optimizing co-production style may be a way to reduce the fluid interference and reservoir gas production damage. In totally, the next research should focus on exploring the influence of the coupling effect of low porosity and low permeability, gas water two-phase flow, multiphase gas symbiosis and coexistence of multiple types of reservoirs on the dynamic evolution law of reservoir-wellbore flow field induced by co-production fluid interference, clarifying the reservoir damage and its mechanism of different phase fluid intrusions on the reservoir, and revealing the coupling flow characteristics of inter-layer crossflow and wellbore pipe flow considering the fluid interference effect.

国家科技重大专项资助项目（2016ZX05044–002）；国家自然科学基金资助项目（52074047）；中国博士后科学基金面上资助项目（2023M731491）

李奇贤，许　江，彭守建，等. 多压力系统气藏合采物理模拟研究进展评述[J]. 煤炭科学技术，2023，51（9）：149−159

LI Qixian，XU Jiang，PENG Shoujian，et al. Review on the progress for physical simulation for gas reservoirs co-production in multi-pressure system[J]. Coal Science and Technology，2023，51（9）：149−159