| 裂缝性致密油藏二氧化碳吞吐基质-裂缝间流体渗流特征研究 |
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| 引用本文： | 巩联浩,刘继梓,武兴,卜广平,黄凡,杨龙. 裂缝性致密油藏二氧化碳吞吐基质-裂缝间流体渗流特征研究[J]. 特种油气藏, 2021, 28(1): 118-124. DOI: 10.3969/j.issn.1006-6535.2021.01.017 |
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| 作者姓名： | 巩联浩 刘继梓 武兴 卜广平 黄凡 杨龙 |
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| 作者单位： | 中国石油长庆油田分公司,陕西 榆林 718606 |
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| 基金项目： | 国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”(2016ZX05050) |
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| 摘 要： | 为深入探究裂缝性致密油藏CO2吞吐过程中基质-裂缝间流体渗流机理,采用自主设计的高压无磁岩心夹持器开展脉冲式注CO2吞吐岩心实验.基于核磁共振T2谱测试原理,对CO2吞吐过程中的岩心进行在线扫描,研究CO2吞吐过程中基质内孔隙中原油的微观动用特征和基质-裂缝间流体的渗流特征.结果表明:CO2进入裂缝后,沿着裂缝驱替原油...
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| 关 键 词： | 致密油藏 核磁共振 CO2吞吐 基质—裂缝 微观孔隙 渗流特征 |
| 收稿时间： | 2020-03-07 |
Study on Seepage Characteristics of Fluid Between Matrix and Fracture in CO2 Huff-puff Process in Fractured Tight Reservoirs |
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| Gong Lianhao,Liu Jizi,Wu Xing,Bu Guangping,Huang Fan,Yang Long. Study on Seepage Characteristics of Fluid Between Matrix and Fracture in CO2 Huff-puff Process in Fractured Tight Reservoirs[J]. Special Oil & Gas Reservoirs, 2021, 28(1): 118-124. DOI: 10.3969/j.issn.1006-6535.2021.01.017 |
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| Authors: | Gong Lianhao Liu Jizi Wu Xing Bu Guangping Huang Fan Yang Long |
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| Affiliation: | PetroChina Changqing Oilfield Company, Yulin, Shaanxi 718606, China |
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| Abstract: | In order to further explore the seepage mechanism of fluid between matrix and fracture in CO2 huff-puff process in fractured tight reservoirs, a self-designed high-pressure non-magnetic core holder was used to perform pulsed CO2 huff-puff core experiment. Based on the principle of nuclear magnetic resonance T2 spectrum testing, the core was scanned online in the process of CO2 huff and puff to study the micro production characteristics of crude oil in the pores of matrix and the seepage characteristics of fluid between matrix and fracture during CO2 huff and puff. he results of the study show that after CO2 entered the fracture, the crude oil was displaced along the fracture, but the crude oil in the matrix could not be produced. At the early stage of well shut-in, the crude oil saturated with CO2 in the matrix macropores (20.5 ms ＜ T2 ≤ 716.0 ms) entered the fractures under the action of expansion. At the later stage of the shut-in, the differential diffusion of crude oil concentration caused by CO2 extraction and the capillary force of pores in different sizes gradually became the the dominant force, and prolongation of shut-in time could effectively increase the production degree of crude oil in the matrix. The recovery efficiency of crude oil was main contributed by the large pores, while the production degree of small pores was poor. With the increase in the pulsed gas injection cycle, the cyclic matrix recovery percent was continuously reduced. The CO2 huff-puff cycle should be reduced and the shut-in time should be prolonged during the implementation at the mine. In addition, the lower limit of depletion pressure should be set close tot he saturation pressure to improve the overall recovery efficiency during huff and puff. The study results provide reference and basis for enhancing the recovery efficiency of fractured tight oil reservoirs. |
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| Keywords: | tight oil reservoir nuclear magnetic resonance CO2 huff-puff matrix-fracture micro-pore seepage characteristics |
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