致密油藏非达西渗流流态响应与极限井距研究

第 46 卷第 5 期中南大学学报(自然科学版) V ol.46 No.5 2015 年 5 月 Journal of Central South University (Science and Technology) May2015 DOI: 10.11817/j.issn.1672­7207.2015.05.022

致密油藏非达西渗流流态响应与极限井距研究

任龙 1 ，苏玉亮 1 ，赵广渊 2

(1. 中国石油大学(华东) 石油工程学院，山东 青岛，266580;

2. 中海油田服务股份有限公司，天津 塘沽，300452)

摘要：基于实际岩心流动实验，利用典型非线性渗流数学模型，对致密油藏非达西渗流流态响应和极限注采井距 进行研究，并结合实例，计算不同渗透率级别下采油井的极限布井轨迹，揭示注采井间压力及压力梯度分布特征。

研究结果表明：致密油藏单相流体渗流可分为不流动区域、非线性渗流区域和拟线性渗流区域3个渗流流态响应 区域；考虑压裂时，不同渗透率级别下采油井的极限布井轨迹相似(一条直线和一段 1/4 圆弧组成)；随着距水井 距离的增加，注采井间压力及压力梯度分布的3条近似直线段依次对应注水井附近的径向流、裂缝附近的拟径向 流和裂缝内的线性流3种渗流流态，且渗透率越小，最小启动压力梯度越明显，注水井与裂缝端点之间的压力损 失越严重。

关键词：致密油藏；非达西渗流；流态；极限井距

中图分类号：TE348 文献标志码：A 文章编号：1672−7207(2015)05−1732−07 Non­Darcy flow pattern response and critical well spacing in

tight oil reservoirs

REN Long 1 , SU Y uliang 1 , ZHAO Guangyuan 2

(1. School of Petroleum Engineering, China University of Petroleum (Huadong), Qingdao 266580, China;

2.China National Offshore Oil Corporation (CNOOC)Oilfield Service Limited, Tianjin 300452, China)

Abstract: Based on the experiment results of actual cores and the typical non­linear flow mathematical model, the non­Darcy flow pattern response and critical well spacing in tight oil reservoirs were investigated. Based on a case, the critical well spacing in different permeability reservoirs was calculated, which reveals the pressure and gradient pressure distributing regularity between injection well and production well. The results indicate that during the single­phase flow in tight oil reservoir, there are three flow pattern response regions: a non­flow area, a non­linear flow area and a quasi­linear flow area. For fractured well, the track of production well about the injection well (i.e.,a line and a quarter of

a circle)is similar. As further away from the injection well, three pressure or gradient pressure distribution lines can show

three flow patterns: radical flow near the injection well, pseudo radical flow around the fracture and linear flow in the fracture. The tighter reservoir is, the greater minimum start­up pressure gradient will be, and the more pressure loss between injection well and the tip point of fracture.

Key words:tight oil reservoirs; non­Darcy flows; flow pattern; critical well spacing

收稿日期：2014−05−26；修回日期：2014−08−20

基金项目(Foundation item)：国家科技重大专项(2011ZX05051)； 长江学者和创新团队发展计划项目(IRT1294) (Project(2011ZX05051) supported by the National Science and Technology Major Project; Project(IRT1294) supported by the Program for Changjiang Scholars and Innovative Research Team in University)

通信作者：任龙，博士研究生，从事油气渗流理论与应用方面的研究；E­mail: dragon_rmb@