页岩气田集输管网模拟及优化研究

Simulation and Optimization of Gathering Pipeline Network in Shale Gas Field

摘要: 气田地面集输管网系统是保障气田持续稳定开发的关键，能够保证天然气平稳、安全、有效的输送。气田气井的产量以及井口生产压力的变化对输送过程都有一定的影响。某页岩气田气井产量和井口生产压力的不断降低，自压集输已不能满足要求。目前该气田主要采用单井–区域增压外输的工艺，随着页岩气开发规模的不断扩大，气井逐渐增多，分析和处理管网运行工况、论证和提出合理的运行优化方案具有重要意义。采用TGNET软件建立某页岩气田集输管网模型，计算分析页岩气地面集输管网中天然气流动规律，找到管网系统中各个节点压力、流量等参数间的相互关系，提出单井–干线–区域增压方案，起到节约经济，方便管理的目的。

Abstract: Gas field ground gathering pipeline network system is the key to ensure the sustainable and stable development of gas field, which can ensure the smooth, safe and effective transportation of natural gas. The production of gas wells and the change of wellhead production pressure have a certain impact on the transportation process. With the continuous decrease of gas well production and well- head production pressure in a shale gas field, self-pressure gathering and transportation cannot meet the requirements. At present, the gas field mainly adopts the single well-regional pressuriza-tion process. With the continuous expansion of shale gas development scale, gas wells are gradually increasing. It is of great significance to analyze and deal with the operation conditions of the pipeline network, demonstrate and propose reasonable operation optimization schemes. The TGNET software was used to establish a shale gas field gathering and transportation pipeline network model, and the natural gas flow law in the shale gas ground gathering and transportation pipeline network was calculated and analyzed. The relationship between the pressure and flow parameters of each node in the pipeline network system was found. The single well-main line-regional pressurization scheme was proposed to save economy and facilitate management.