Feasibility of Natural Gas Miscible Flooding in Ultra-Deep Fault-Controlled Reservoirs in Shunbei-1 Block

doi:10.7657/XJPG20230210

Abstract

Abstract:

The Shunbei-1 block is characterized by abundant natural gas resources，high reservoir pressure，and enriched remaining oil at the reservoir top，suggesting the potential of development by natural gas miscible flooding. Through fluid phase simulation experiment and reservoir numerical simulation，the feasibility of natural gas miscible flooding in the Shunbei-1 block was demonstrated from the aspects of crude oil phase state，miscible conditions，and injection methods. The results show that the injection of oil with CH₄ has the advantages of low saturation pressure，large volume expansion coefficient，and low miscible pressure; the minimum miscible pressure when injecting CH₄ is about 46.80 MPa，and the minimum miscible pressure when injecting associated gas is about 4.00 MPa lower than that when injecting dry gas. At present，more than 80% of flooding units can achieve miscible displacement by re-injecting natural gas，and water-alternating-gas (WAG) injection can delay the breakthrough of gas and water，which will improve the sweep efficiency to realize reservoir energy replenishment and equilibrium displacement. The simulation of 3-year production with different injection schemes reveals that the recovery percent is increased by 11.2%.

Key words: Shunbei-1 block, fault-controlled reservoir, natural gas miscible flooding, gas injection mechanism, phase behavior, minimum miscible pressure, enhanced oil recovery

CLC Number:

TE155

CHEN Yong, ZHU Lele, LIU Xueli. Feasibility of Natural Gas Miscible Flooding in Ultra-Deep Fault-Controlled Reservoirs in Shunbei-1 Block[J]. Xinjiang Petroleum Geology, 2023, 44(2): 203-209.

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