一种新型高温低渗透油藏注气防窜聚合物泡沫体系
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1.中国石油大学(北京);2.中海油研究总院

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国家自然科学基金青年科学基金(51704303)


A new polymer foam system of anti-gas-channeling in high temperature low permeability reservoir
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    摘要:

    空气驱是提高油藏采收率的有效手段之一,但注气过程中易发生气窜,影响开发效果,气窜后产出端氧气含量上升,存在安全隐患,能否封堵气窜是空气驱成败的关键所在。渤海34-2区块属于高温低渗油藏,常规调整井网、气水交替等手段效果欠佳,化学封堵则存在成本较高、稳定性差等问题亟待解决,均难以起到很好的封窜效果。为此,本文基于聚合物增粘和泡沫调驱的双重特性,研发了一种新型聚合物泡沫调剖体系,并测试了体系的热稳定性和抗剪切能力。通过注入驱替实验和CT扫描,评价了调剖体系封堵性能和作用范围;在此基础上,采用二维模型,分别进行了注空气后转水气交替(WAG)和注空气后注调剖剂再注空气防窜实验。结果表明,130℃下聚合物泡沫新体系的封堵率高达98%,提高驱油效率较常规水气交替高5%,高温下封堵能力和提采效果较好,为高温低渗透油藏注气防窜提高采收率提供了一条新的思路。

    Abstract:

    Air injection is one of the effective means to enhanced oil recovery, but gas channeling is prone to occur during air injection, which affects the development effect. After gas channeling, the oxygen content at the output end rises and there is a risk of explosion, the key to the success of air injection is whether it can block the gas channeling. Bohai 34-2 block is a high temperature and low permeability reservoir, conventional methods such as adjustment of well pattern and water-gas alternation are not effective, while normal blocking agents has some problems such as high cost and poor stability need to be solved. Therefore, a new polymer foam system was developed based on the dual characteristics of polymer viscosification and foam flooding, and the thermal stability and shear resistance of the system were tested. The plugging performance and scope of profile control system were evaluated by displacement experiment and CT scan. On this basis, two dimensional models were used to conduct WAG after air injection and plugging agent injection after air injection. The results show that the plugging rate of the new polymer foam system is up to 98% at 130℃, and the enhanced oil recovery is 5% higher than that of the conventional water-gas alternations, and the plugging ability and oil displacement effect are good at high temperature, which provides a new idea for gas injection prevention and enhanced oil recovery in high temperature and low permeability reservoirs.

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  • 收稿日期:2021-01-25
  • 最后修改日期:2021-04-15
  • 录用日期:2021-05-12
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