A low permeability gas field gathering and transportation system and its gathering and transportation method

Abstract

The invention relates to a low-permeability gas field gathering and transmitting system and a gathering and transmitting method of the low-permeability gas field gathering and transmitting system. The low-permeability gas field gathering and transmitting system comprises a plurality of gas gathering stations, a plurality of well clusters and a processing factory, wherein the well clusters are communicated with the gas gathering stations through independent gas production pipelines, the gas gathering stations are communicated to the processing factory sequentially through gas gathering branch lines and a gas gathering main line, and a gas gathering system is arranged in the gas gathering stations and sequentially comprises a plurality of gas gathering station inlet pipelines, a plurality of separators, a compressor and a gas gathering station outlet pipeline. According to the low-permeability gas field gathering and transmitting system and the gathering and transmitting method of the low-permeability gas field gathering and transmitting system, high-pressure production is performed while the transmitting and processing requirement is met at the early stage of the well clusters, pressure energy and temperature energy at the early stage of a gas well are fully utilized, the pipe diameter of a pipeline and the injection amount of hydrate inhibitors are reduced, low-pressure production is performed at the middle-later stage, concentrated pressurization is performed on the gas gathering stations, concentrated processing is performed in the processing factory, gas field development ground investment and running cost are reduced, and construction of a gas gathering pipe network is more reasonable.

Description

technical field [0001] The invention relates to a low-permeability gas field gathering and transportation system and its gathering and transportation method, which is especially suitable for gas field formation pressure attenuation quickly and gas gathering technology for large well cluster development. , centralized pressurization at the gas gathering station and centralized treatment at the treatment plant. Background technique [0002] The gas field gathering and transportation system is composed of the gas field internal gas gathering pipeline network between the wellhead and the processing plant, the well site, and the gas gathering station. The system collects the wellhead natural gas through the gas gathering pipeline network, and sends it to the subsequent gas The treatment plant finally becomes a qualified product gas, which is exported to downstream users. [0003] The gas field gathering and transportation system is a complex process system. There are many gather...

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Problems solved by technology

[0006] For low-permeability gas fields with large gas fields and large well clusters (more well clusters), the distribution of well clusters is relatively concentrated. If the wellhead pressure is controlled at the beginning to reduce the pipeline transportation pressure, the pressure will decrease due to the large number of well cluster wells and large gas volume. The diameter of post-production pipelines increases sharply, resulting in higher pipeline network investment

In the middle and later stages of gas field production, due to the reduction of formation pressure and gas volume, the capacity of the gas collection pipeline network is greatly wasted

If centralized pressurization is performed in the treatment plant, the pipe network diameter of the entire gas field will be large in the early stage, and the pipeline network will have a large amount in the middle and late stages, resulting in unreasonable construction of the entire gas field.

[0007] Moreover, medium and low pressure production is carried out by controlling the wellhead pressure, resulting in the waste of initial pressure energy and temperature energy of the gas well, increasing the energy consumption of gas field development and increasing the development cost

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