顺北一区超深断控油藏注天然气开发的可行性

doi:10.7657/XJPG20230210

摘要/Abstract

摘要：

顺北一区矿场天然气资源丰富、油藏压力高、顶部剩余油富集，具备注天然气混相驱的开发潜力。通过注气流体相态模拟实验和油藏数值模拟，从注气原油相态、混相条件、注气方式等方面，论证顺北一区注天然气混相驱开发的可行性。研究表明，注CH₄原油具有饱和压力低、体积膨胀系数大、混相压力低等优势；注CH₄最小混相压力约为46.80 MPa，注伴生气最小混相压力较注干气约降低4.00 MPa。回注天然气，80%以上的井组可实现混相驱替；气水交替注入可延缓气水突破时间，提高驱替相波及系数，补充地层能量和实现均衡驱替，模拟3年可提高采出程度11.2%。

关键词: 顺北一区, 断控油藏, 天然气混相驱, 注气机理, 相态特征, 最小混相压力, 提高采收率

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

中图分类号:

TE155

陈勇, 朱乐乐, 刘学利. 顺北一区超深断控油藏注天然气开发的可行性[J]. 新疆石油地质, 2023, 44(2): 203-209.

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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