三塘湖盆地MZ区块致密油藏CO2吞吐提高采收率

doi:10.7657/XJPG20230508

摘要/Abstract

摘要：

三塘湖盆地MZ区块致密油藏具有中—高孔隙度、特低渗透率和高含油饱和度的特征。开发初期采用水平井体积压裂获得高产，但自然递减率大，后期通过注水吞吐使得储量得到有效动用，但经过多年开发后注水吞吐效果逐轮变差，目前采出程度仅5.6%。为进一步提高采收率，开展了5口水平井CO₂吞吐试验。结果表明：CO₂在致密油提高采收率中主要发挥溶胀、增能、降黏、萃取轻质组分、提高流体流动能力等作用；在注入、焖井及生产全过程，CO₂作用机理会发生变化，从而造成原油性质的变化；CO₂在提高原油采收率的同时还具有较高的埋存率，兼具经济效益和社会效益，在致密油藏开发中具有较好的适应性和推广应用前景。

关键词: 三塘湖盆地, MZ区块, 致密油藏, CO₂吞吐, 提高采收率, 驱油, 埋存率

Abstract:

The tight oil reservoirs in the MZ block of the Santanghu basin are characterized by medium-high porosity, ultra-low permeability, and high oil saturation. In the initial development stage, high production rate was achieved by virtue of volume fracturing in horizontal wells, but declined greatly. In the late stage, the reserves were effectively produced through water huff-n-puff. After years of development, the effect of water huff-n-puff became worse. The current recovery percent of reserves is only 5.6%. For further enhancing the oil recovery, CO₂ huff-n-puff experiments were conducted in five horizontal wells. The results show that CO₂ plays a pivotal role in enhancing recovery in tight oil reservoirs through the mechanisms such as swelling, energy augmentation, viscosity reduction, light component extraction, and fluid mobility improvement. The impact of CO₂ varies throughout the injection, soaking, and production stages, leading to alteration in crude oil properties. CO₂ can enhance oil recovery and also demonstrate a high storage rate, offering both economic and social benefits. CO₂ huff-n-puff is adaptable and promising for tight oil reservoir development.

Key words: Santanghu basin, MZ block, tight reservoir, CO₂ huff-n-puff, EOR, oil displacement, storage rate

中图分类号:

TE357

李世瑞, 赵凯, 徐江伟, 木尔扎提·艾斯卡尔, 徐金禄, 张星. 三塘湖盆地MZ区块致密油藏CO₂吞吐提高采收率[J]. 新疆石油地质, 2023, 44(5): 572-576.

LI Shirui, ZHAO Kai, XU Jiangwei, Murzhaty ASKUR, XU Jinlu, ZHANG Xing. Enhanced Oil Recovery by CO₂ Huff-n-Puff in Tight Oil Reservoirs in Mazhong Block，Santanghu Basin[J]. Xinjiang Petroleum Geology, 2023, 44(5): 572-576.

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三塘湖盆地MZ区块致密油藏CO₂吞吐提高采收率

Enhanced Oil Recovery by CO₂ Huff-n-Puff in Tight Oil Reservoirs in Mazhong Block，Santanghu Basin

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