非均质特低渗透油藏CO2驱气窜规律研究

doi:10.11885/j.issn.1674-5086.2016.05.01.61

摘要/Abstract

摘要：

特低渗透油藏在二氧化碳驱油过程中极易发生气窜现象，严重影响注气开发效果。为了有效地封堵气窜优势通道，提高二氧化碳气驱的波及体积和驱油效率，建立不同渗透率级别的非均质岩芯模型、高渗透带气窜模型、裂缝模型等室内实验模型，测得二氧化碳在不同阶段的见气时间、气窜时间及采出程度；在此基础上选用含地层水、淀粉、不饱和单体、交联剂、成胶控制剂等组分的高强度高性能封窜剂（乙二胺）在不同渗透类型岩芯模型进行二氧化碳封窜控制实验。实验结果表明，二氧化碳气体的波及体积受气窜影响严重，岩芯非均质性越强，气窜现象越严重，气驱效果越差；在渗透率级差较小的情况下，采出程度随渗透率级差的增加而降低，当级差大于100时，采出程度急剧下降，气窜严重，低渗透储层难以波及到，造成总采出程度低。通过高强度高性能乙二胺封窜剂，能够稳定封堵基质中的相对高渗层的窜流，有效扩大二氧化碳驱的波及体积有效扩大CO₂驱的波及体积，室内提高采收率30%以上。

关键词: 特低渗透油藏, 非均质性, CO₂驱, 气窜时间, 采出程度, 封窜剂

Abstract:

To effectively seal preferential breakthrough channels and to increase the sweep volume and flooding efficiency of carbon dioxide, in-situ experimental models with different permeabilities were established, including a heterogeneous core model, a high permeability zone gas-channeling model, and a fracture model. CO₂ was measured at different stages of breakthrough time, channeling time, and degrees of recovery. On this basis, a high-strength, high-performance channeling sealing agent, ethylene diamine, containing formation water, starch, unsaturated monomer, a cross-linking agent, and a gel control agent was selected to carry out the carbon dioxide sealing control experiments in various permeability core models. The channeling sealing agent reacted with the carbon dioxide and formed carbamate. The experimental results showed that the carbon dioxide sweep volume was seriously affected by the gas channeling, and the gas channeling effect became stronger with increasing core heterogeneity. As the gas flooding effect weakened in the low-variation permeability conditions, the degree of recovery decreased with the increasing permeability. When the variation exceeded 100, the degree of recovery decreased rapidly and the gas channeling became severe. The low permeability reservoirs became difficult to reach, and as a result, the degree of recovery decreased. By using the high-strength, high-performance channeling sealing agent, ethylenediamine, the relatively high permeable channeling layers in the matrix were sealed in a stable manner and the carbon dioxide flooding sweep volume was expanded effectively. The in-situ degree of recovery increased by over 30%.

Key words: ultra-low permeability reservoir, heterogeneity, CO₂ flooding, gas channeling time, degree of recovery, channeling sealing agent

中图分类号:

TE348

赵习森, 石立华, 王维波, 白远, 田丰. 非均质特低渗透油藏CO₂驱气窜规律研究[J]. 西南石油大学学报(自然科学版), 2017, 39(6): 131-139.

ZHAO Xisen, SHI Lihua, WANG Weibo, BAI Yuan, TIAN Feng. CO₂ Channeling Sealing In Ultra-low-permeability Reservoirs[J]. 西南石油大学学报(自然科学版), 2017, 39(6): 131-139.

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非均质特低渗透油藏CO₂驱气窜规律研究

CO₂ Channeling Sealing In Ultra-low-permeability Reservoirs

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