窄条带油藏CO₂驱仿水平井模式与参数优化

Imitating Horizontal Well Mode and Parameter Optimization for CO₂ Flooding in Narrow‑Strip Reservoirs

摘要: 窄条带油藏高含水期开发面临剩余油分散与气窜控制的矛盾，传统水驱和简单注气策略效果有限，亟需探索有效的技术路径。本文围绕CO₂驱中的气窜管控与系统优化问题，构建“模式创新–参数协同–矿场应用”的研究框架。提出“仿水平井”驱替模式，通过井功能动态转换实现流线重构，将易气窜通道转为有效驱替路径；在此基础上，建立“注入方式–注采节奏–产液强度”的参数优化方法。确定“先水后气”、3:4气水比、110 m³/d产液速度为协同技术政策。在J油田G断块的应用中，该技术体系预计提高采收率6.62%。为同类强非均质油藏开发提供了可参考的技术路径。

Abstract: During the high water cut stage, development of narrow‑strip reservoirs faces the contradiction between dispersed remaining oil and gas channeling control, while conventional water flooding and simple gas injection strategies show limited effectiveness, necessitating the exploration of effective technical pathways. Focusing on gas channeling control and systematic optimization in CO₂ flooding, this paper establishes a research framework of “model innovation-parameter synergy-field application”. An “imitating horizontal well” displacement mode is proposed, which achieves streamline reconstruction through dynamic well‑function conversion, turning gas channeling pathways into effective displacement routes. On this basis, a parameter optimization method covering “injection pattern - injection‑production rhythm - liquid production intensity” is developed. A collaborative technical strategy is determined: water‑followed‑by‑gas injection, a 3:4 gas‑to‑water cycle ratio, and a liquid production rate of 110 m³/d. Applied to Block G of J Oilfield, this technical system is projected to enhance oil recovery by 6.62%, providing a reference technical path for the development of similar highly heterogeneous reservoirs.