Key Technologies and Applications of High-efficiency Surface Gathering and Transportation in Zhongjiang Gas Field

doi:10.11885/j.issn.1674-5086.2022.01.28.02

Abstract

Abstract: Aiming at the problems of rolling development of ZJ Gas Field, high pipeline network pressure caused by rapid production ramp-up, difficulty in production of low-pressure and low-yield wells, and interference between wells at the same well site restricting the production release of low-pressure wells, three surface high-efficiency measures for pipeline network, station site and gas well, research and application of key technologies for gathering and transportation were carried out. Firstly, multi-scheme structural optimization simulation was carried out based on the existing pipeline network, and a figure-8 "branch + ring" composite pipeline network was established, which doubled the gathering and transportation capacity and reduced the back pressure at the far end of the gas field by 0.5 MPa, ensuring natural gas second, for axially distributed low-pressure and low-yield gas wells, a systematic evaluation of the technical and economic limits of 5$\sim$10 km multi-node booster radius was carried out, and a 10 km long-radius booster scheme for the ZJ Gas Field was formed, which increased the coverage by 30% and reduced the construction cost by 25%, to realize low-cost pressurization of gas wells distributed in narrow and long strips; finally, for the high and low pressure gas wells in the same well site, a "movable + low pressure difference" ejector device was developed, which reduced the conventional ejection pressure difference from 3.0$\sim$5.0 MPa to 0.4$\sim$1.0 MPa, realizing the injection booster of the low-pressure well relative to the high-pressure well in the same well station without the external power source. The high-pressure gas well at the well site inhibits the production of the low-pressure gas well; the key technologies of efficient surface gathering and transportation in the ZJ Gas Field effectively support the smooth realization of the gas field production target and ensure the "production and output".

Key words: pipe network optimization, long radius pressurization, enjection, low differential pressure, low cost

CLC Number:

TE732

FU Xianhui, YAO Linyu, WANG Quan, LUO Linjie, WANG Xiaogang. Key Technologies and Applications of High-efficiency Surface Gathering and Transportation in Zhongjiang Gas Field[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(3): 215-223.

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