Abstract：

　　Unconventional natural gas reserves are abundant on earth. Natural gas is regarded as a substitute for conventional coal and oil because it is cleaner. Preliminary gathering and transportation technologies suited for coalbed methane, shale gas and tight sandstone gas have been developed in China. In recent years, the feasibility of multi-gas co-production (co-exploration and concurrent production of coalbed methane, shale gas and tight sandstone gas) has been proved by a series of exploratory developments and pilot tests. Through multi-gas co-production, the costs will reduce and economic efficiency and resource utilization will improve. However, these technologies are still at an initial stage. In addition to the difficulties in a single unconventional natural gas gathering and transportation system, there is another key issue which needs to be solved. Namely, how to overcome the conflicts between gases of different pressure levels in a diverse pressure gathering system. This is mainly in: (1) the pressure matching between production layers, individual wells and gathering networks, (2) the coordinated utilization of energy among the gases of different pressure levels, (3) the intelligent matching of process parameters in gathering and transportation systems. In order to produce gas from these different sources in an economical and efficient way, the difficulties mentioned above will need to be solved by carrying out the following studies: (1) Techniques for integration of gas production and gathering and transportation for multi-gas co-production, (2) simulation and optimization technique of multi-gas co-production gathering systems containing ejector devices, (3) intelligent matching techniques for the gathering and transportation process parameters considering the system efficiency.

Key words： multi-gas co-production unconventional gas surface gathering system simulation and optimization parameter matching

Received： 12 August 2017

Corresponding Authors：GONG Jing, ydgj@cup.edu.cn

Cite this article：HONG Bingyuan,LI Xiaoping,LI Yu等. Issues and proposals of a surface gathering system in multi-gas co-production[J]. Petroleum Science Bulletin, 2018, 3(2): 195-204.

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