顺北油田超深断控挥发性油藏高效开发政策

doi:10.7657/XJPG20250407

摘要/Abstract

摘要：

顺北油田超深断控挥发性油藏埋深大，厚度大，呈板状分布，开发过程中天然能量弱，能量和产量递减快。早期实践表明，快速注水和大排量注气容易导致井间高导流通道窜进，影响驱替效率和波及范围。提出气水复合立体注采模式，即以注水为主、注天然气为辅的复合驱替补能方式，构建水驱低注高采、气驱高注低采注采关系，建立注水注气复合立体注采井网。注水动用井间未波及剩余油、井周中—下部未动用剩余油，天然气驱替顶部阁楼型剩余油，提高驱替效率，扩大波及范围，实现油藏长期能量稳定。基于该技术政策指导典型气水复合驱单元，预测可提高采收率26.0%，地层压力恢复9.0 MPa，气油比下降至820 m³/t，流压恢复至45 MPa。

关键词: 顺北油田, 碳酸盐岩, 断控, 挥发性油藏, 气水复合注采, 开发技术政策

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

中图分类号:

TE344

任文博, 刘迪仁, 李小波, 曹飞, 刘学利, 代金城. 顺北油田超深断控挥发性油藏高效开发政策[J]. 新疆石油地质, 2025, 46(4): 448-456.

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.

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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