稠油油藏水气交替诱导泡沫油冷采提高采收率实验
Enhanced Oil Recovery Experiment of Foam Oil Cold Recovery Induced by Water-Alternating-Gas Injection in Heavy Oil Reservoirs
甄贵男 1王健 2吴宝成 1王炜龙 1唐杨 2路宇豪2
作者信息
- 1. 中国石油新疆油田分公司,新疆 昌吉 831700
- 2. 西南石油大学油气藏地质及开发工程全国重点实验室,四川 成都 610500
- 折叠
摘要
针对普通稠油油藏水驱过程中存在的黏性指进、动用不充分、采出程度低等问题,基于新疆油田吉 7 油藏开展了水气交替诱导泡沫油冷采技术研究,自行设计泡沫油配样装置,通过Image J软件对泡沫油图像进行表征,对泡沫油的性能、泡径、泡沫数量进行综合分析;设计制作可视化平面模型,开展稠油注气辅助水驱的泡沫油微观驱油机理研究;开展岩心驱替实验,优化水气交替诱导泡沫油冷采的注入参数.研究表明:CO2 在低黏原油中形成的泡沫油性能更好,发泡体积为202.1 mL,半衰期为324 s,降黏率为32.35%;泡沫油的发泡体积和半衰期通常与泡径和泡沫油数量呈负相关关系;泡沫油聚并对黏壁残余油有剥离作用,CO2 能够有效动用小孔喉原油、油膜和上层原油;在气液比为 1 ∶ 1、注入压力为 30 MPa、驱替速度为 0.2 mL/min的条件下,水气交替诱导泡沫油冷采较普通稠油水驱可提高采收率 18.90%.研究成果为新疆油田吉 7 油藏水气交替诱导泡沫油冷采技术提供了理论依据,也为其他油田水驱稠油油藏提高采收率技术提供了参考.
Abstract
Aiming at the problems of viscous indexing,insufficient producing,and low recovery in the process of water flooding in ordinary heavy oil reservoirs,based on Ji 7 Reservoir in Xinjiang Oilfield,the foam oil cold recov-ery technology was researched induced by water-alternating-gas injection,and the foam oil sample preparation de-vice was designed by itself.The image of foam oil was characterized by Image J software,and the performance,bubble diameter,and foam number of foam oil were comprehensively analyzed;the visual plane model was designed and made to research the microscopic oil displacement mechanism of foam oil during gas injection assisted water flooding in heavy oil reservoir;the core displacement experiment was carried out to optimize the injection parameters of foam oil cold recovery induced by water-alternating-gas.The research shows that the foam oil formed by CO2 in low-viscosity crude oil has better performance;the foaming volume is 202.1 mL,the half-life is 324 s,and the viscosity reduction rate is 32.35%;the foaming volume and half-life of foam oil are usually negatively correlated with the bubble diameter and the number of foam oil;the foam oil polymerization has a stripping effect on viscous wall residual oil,and CO2 can effectively produce crude oil,oil film,and upper crude oil in small pore throat;un-der the condition of the gas-liquid ratio of 1 ∶ 1,the injection pressure of 30 MPa,and flooding rate of 0.2 mL/min,the foam oil cold recovery induced by water-alternating-gas could improve recovery by 18.90%compared with the ordinary water flooding in the heavy oil reservoir.The research results provide a theoretical basis for the foam oil cold recovery induced by water-alternating-gas injection in Ji 7 reservoir of Xinjiang Oilfield and also pro-vide a reference for the enhanced oil recovery technology of water flooding heavy oil reservoirs in other oilfields.
关键词
普通稠油/泡沫油/泡径计算/微观驱油机理/参数优化/冷采/低碳/吉7油藏Key words
ordinary heavy oil/foam oil/bubble diameter calculation/microscopic oil displacement mechanism/parameter optimization/Ji 7 reservoir引用本文复制引用
基金项目
国家自然科学基金面上项目(52174035)
出版年
2024
国家科技期刊平台
NSTL
万方数据