Efficient Development Strategy for Ultra-Deep Fault-Controlled Volatile Reservoirs in Shunbei Oilfield

doi:10.7657/XJPG20250407

Abstract

Abstract:

The ultra-deep fault-controlled volatile reservoirs in Shunbei oilfield are characterized by great burial depth, significant thickness, and tabular distribution, with weak natural energy and rapid decline in both pressure and production during development. Early practice revealed that rapid water injection and high-rate gas injection tend to induce channeling through high-conductivity pathways between wells, compromising displacement efficiency and sweep volume. This paper presents a 3D composite gas-water injection-production strategy. To be specific, water injection is supplemented with gas injection for energy replenishment, so that injector-producer patterns are established with injecting water at lower position and producing oil from higher position, and injecting gas into higher position and producing oil from lower position, forming a 3D well pattern for composite gas-water injection and production. Water injection targets the unswept oil between wells and in middle-lower zones around wellbores, while gas injection displaces the oil at the top, thereby enhancing displacement efficiency and expanding sweep volume to ensure a long-term energy stability of the reservoir. Guided by this strategy, a typical composite gas-water drive unit is projected to enhance oil recovery by 26.0%, restore reservoir pressure by 9.0 MPa, reduce the gas-oil ratio to 820 m3/t, and increase flowing pressure to 45 MPa.

Key words: Shunbei oilfield, carbonate rock, fault-controlled, volatile reservoir, composite gas-water injection and production, development strategy

CLC Number:

TE344

REN Wenbo, LIU Diren, LI Xiaobo, CAO Fei, LIU Xueli, DAI Jincheng. Efficient Development Strategy for Ultra-Deep Fault-Controlled Volatile Reservoirs in Shunbei Oilfield[J]. Xinjiang Petroleum Geology, 2025, 46(4): 448-456.

Figures/Tables 11

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剩余油类型	补能方式	注采高度差/m	注采关系	驱替机理
高部位阁楼型剩余油	注气驱替、注气吞吐	>150	高注低采	天然气气顶驱天然气混相驱
井间注水未波及剩余油	人工底水驱+注气驱替	<150	等高注采	气水复合驱
井周中—下部未动用剩余油	人工底水驱	>150	低注高采	注水重力驱

阶段	注采参数	参数界限	作用机理
注水	注水时机	饱和压力之上压力保持程度大于55%	注水补充能量、油水置换和驱替作用
	注水方式	温和连续注水
	注水速度/（m³·d^-1）	挤压背景：250~300 拉分背景：500~600
注气	注气时机	最小混相压力+15%	混相驱替、气顶驱、补能和驱替作用
	注气方式	周期注气
	注气速度/（10⁴ m³·d^-1）	8~10
	气水周期	气水异步交替：注水3月注气2月
采油	注采比	1.5∶1.0~2.0∶1.0	均衡高效驱替
采油	总注入量/PV	0.2	均衡高效驱替