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

巩联浩; 刘继梓; 武兴; 卜广平; 黄凡; 杨龙

doi:10.3969/j.issn.1006-6535.2021.01.017

特种油气藏 >

2021 , Vol. 28 >Issue 1: 118 - 124

DOI: https://doi.org/10.3969/j.issn.1006-6535.2021.01.017

油藏工程

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

巩联浩 ,
刘继梓 ,
武兴 ,
卜广平 ,
黄凡 ,
杨龙

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中国石油长庆油田分公司,陕西榆林 718606

巩联浩(1982—),男,高级工程师,2006年毕业于西安石油大学资源勘查专业,现主要从事石油开发地质、油藏工程研究与管理工作。

收稿日期: 2020-03-07

修回日期: 2020-11-01

网络出版日期: 2021-04-27

基金资助

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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Study on Seepage Characteristics of Fluid Between Matrix and Fracture in CO₂ Huff-puff Process in Fractured Tight Reservoirs

Gong Lianhao ,
Liu Jizi ,
Wu Xing ,
Bu Guangping ,
Huang Fan ,
Yang Long

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PetroChina Changqing Oilfield Company, Yulin, Shaanxi 718606, China

Received date: 2020-03-07

Revised date: 2020-11-01

Online published: 2021-04-27

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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,而基质中原油无法动用。闷井初期,基质大孔隙(20.5 ms＜T₂≤716.0 ms)中饱和CO₂后的原油在膨胀作用下进入裂缝;闷井后期,CO₂抽提引起的原油浓度差异扩散和不同孔径孔隙毛管力逐渐成为主导动力,延长闷井时间能够有效提高基质中原油动用程度。原油采收率主要贡献来源于大孔隙,而小孔隙的动用程度较差,随着脉冲注气周期的增加,周期基质采出程度不断降低;矿场实施过程中应减少CO₂的吞吐周期,延长闷井时间,并将衰竭压力下限设定在饱和压力附近,以提高CO₂吞吐过程的总采收率。研究成果为裂缝性致密油藏提高采收率提供了参考和借鉴。

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

本文引用格式

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

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.

Key words： tight oil reservoir; nuclear magnetic resonance; CO₂ huff-puff; matrix-fracture; micro-pore; seepage characteristics

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