Producing of Edge and Bottom Water Invasion Front and Risk Assessment on Injection and Production of Hutubi UGS

doi:10.7657/XJPG20220110

Abstract

Abstract:

Injection and production of a UGS (underground gas storage) with edge and bottom water is likely forcing gas-water contact to move, so it is necessary to assess the migration of water invasion front and the injection-production risk since it is very important for recovering the storage capacity and improving the peak shaving ability of injection and production wells. Taking the Hutubi UGS as a case, we evaluated the feasibility of recovering the gas/water front of the UGS with edge and bottom water, simulated the position of gas front by tracer numerical simulation technology, and enhanced the flow capacity of the reservoir by multiple cycles of gas flooding. Then an indicator system evaluating dynamic and static parameters that affect the water invasion in injection and production wells was established, and the risks of water breakthrough were evaluated in 30 injection and production wells in Hutubi UGS. It is found that there are only 3 wells with high water invasion risk in the study area, which are located in the western water invasion area. Finally, an early water invasion warning mechanism was proposed. The mechanism aims to monitor the production performance, record real-time production parameters such as water production, water-gas ratio, Cl^- content in produced water and wellhead pressure of the wells with medium–high water invasion risks, and adjust and optimize the injection and production rates and gas volumes, and as a result, control the advancing speed of the gas/water front.

Key words: Hutubi, UGS, edge and bottom water, water invasion, gas injection front, storage capacity, peak shaving capacity, risk assessment, early warning mechanism

CLC Number:

TE332.3

LIAO Wei, LIU Guoliang, LI Xinlu, ZHANG Yunxin, ZHENG Qiang, LU Ye. Producing of Edge and Bottom Water Invasion Front and Risk Assessment on Injection and Production of Hutubi UGS[J]. Xinjiang Petroleum Geology, 2022, 43(1): 66-71.

Figures/Tables 6

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Table 1

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