Analysis of the selection of gas pressure difference power generation technology for offshore gas fields
ZHAN Naida
PANG Zhenhai
SHANG Pengcheng
LAO Jingshui
YANG Jiping
Abstract：To recycle the pressure difference energy at the wellheads of offshore gas fields and address the issues of the difficulty in adapting land-based technologies to the compact space of offshore platforms and the presence of liquid and impurities,by reviewing the current technical status at home and abroad and statistically analyzing the data of 21 land-based demonstration projects,a technical characteristic comparison and adaptability analysis of turbine type,screw type,and double rotor type expansion generators are conducted from the dimensions of operating pressure,equipment structure,automatic control level,and medium adaptability.The results show that the double rotor expansion machine exhibits advantages such as a simple structure,zero leakage,one-button start and stop,and resistance to impact within the pressure range of 0.5 MPa to 10.0 MPa and in gas-liquid mixed conditions.It demonstrates advantages in adapting to the technology route of generating electricity from the pressure difference at the gas wellheads of offshore gas fields.However,further research is needed to develop a higher pressure(≥30 MPa)unit and to equip it with a sand removal and dehydration pre-treatment system to achieve efficient recovery of the high-pressure pressure difference energy at the wellhead and provide green electricity for offshore platforms.
Keywords：gas pressure difference energyexpansion generatoroffshore platformexcess pressure power generationofshore gas field
Publication Date：2026-02-25
Online Publishing Date：2026-03-31(First online date of this platform, not the publication date of the document)
Pages：5( 153-157 )