致密油藏流体渗流规律实验研究

赵玉集; 王学武; 凌浩川

doi:10.3981/j.issn.1000-7857.2014.h2.007

科技导报 >

2014 , Vol. 32 >Issue 28/29: 59 - 63

DOI: https://doi.org/10.3981/j.issn.1000-7857.2014.h2.007

研究论文

致密油藏流体渗流规律实验研究

赵玉集 ,
王学武 ,
凌浩川

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1. 中国矿业大学(北京), 北京 100083;
2. 中国石油勘探开发研究院廊坊分院, 廊坊 065007;
3. 中海石油天津分公司渤海石油研究院, 天津 300452

赵玉集, 高级工程师, 研究方向为低渗/致密油藏储层特征及渗流机制, 电子信箱: 94671855@qq.com

收稿日期: 2014-07-02

修回日期: 2014-08-12

网络出版日期: 2014-10-24

基金资助

国家油气重大专项(2011ZX05013-006);中国石油天然气集团公司重大基础攻关课题(2014B-1203)

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Experimental Study on the Porous Flow Law of Tight Oil Reservoir

ZHAO Yuji ,
WANG Xuewu ,
LING Haochuan

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1. China University of Mining and Technology(Beijing), Beijing 100083, China;
2. Langfang Branch, PetroChina Exploration and Development Research Institute, Langfang 065007, China;
3. Institute of Bohai Offshore Oil, Tianjin Branch, CNOOC. Tianjin 300452, China

Received date: 2014-07-02

Revised date: 2014-08-12

Online published: 2014-10-24

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摘要

采用光电微流量计实现了微细流量的精确测量,建立了一套致密油藏岩心渗流曲线测试方法,分析了喉道半径、微裂缝和流体性质对致密油渗流规律及启动压力梯度的影响。研究结果表明:岩心由不同级别的喉道组成是致密油产生非线性渗流的本质,真实启动压力梯度与最大喉道半径具有较好的幂律关系,拟启动压力梯度和平均喉道半径具有较好的幂律关系;与基质型岩心相比,含微裂缝岩心的真实启动压力梯度和拟启动压力梯度都有所降低,真实启动压力梯度降低的幅度大于拟启动压力梯度;与模拟地层水相比,利用模拟油得到的真实启动压力梯度和拟启动压力梯度都有所增大,渗透率越低,不同流体介质得到的真实启动压力梯度和拟启动压力梯度差异越显著。

关键词： 致密油; 渗流规律; 启动压力梯度; 微裂缝; 微流量

本文引用格式

赵玉集 , 王学武 , 凌浩川 . 致密油藏流体渗流规律实验研究[J]. 科技导报, 2014 , 32(28/29) : 59 -63 . DOI: 10.3981/j.issn.1000-7857.2014.h2.007

Abstract

Based on the precise measurement of the micro flow by the photo-electric micro meter, a method to measure the differential pressure flow curves of tight oil cores is proposed in this paper. The influence factors, such as throat radius, micro fracture and fluid property, on the porous flow law of tight oil reservoir and the start-up pressure gradient are analyzed. The results are as follows. The essence of nonlinear flow in tight oil core is that the cores are composed of different levels of the throats. The real startup pressure gradient and the maximum throat radius have a good power-law relationship, and the pseudo start-up pressure gradient also has a power-law relationship with the average throat radius. The core with micro facture has smaller real & pseudo start-up pressure gradients than the core without any micro fracture. The real and pseudo start-up pressure gradients will be greater when using formation oil than those when using formation water in the experiment. The lower the permeability of the core, the greater difference of the real and pseudo start-up pressure gradients.

Key words： tight oil; porous flow law; start-up pressure gradient; micro fracture; micro flow

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