Pressuredrop response characteristics for multi-injection well interfered vertical well in heterogeneous fractured anticline reservoirs

IF 2.6 3区 工程技术 Q3 ENERGY & FUELS Journal of Energy Resources Technology-transactions of The Asme Pub Date : 2023-03-08 DOI:10.1115/1.4062081
Wenyang Shi, Xiankun Liu, Min Gao, Lei Tao, Jiajia Bai, Qingjie Zhu
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Abstract

Fractured anticline reservoirs are mostly developed by a line production well located at the top position and a line injecting well located at the bottom position. The production well is often interference with by multiple injecting wells, but there is little related research about multiple injecting well interference. To solve this problem, an extended bottom-hole pressuredrop (BHPD) response model for production well interfered with by multiple injection wells was presented to capture the injection interference and gravity effect. The proposed model's correctness is validated by the software numerical simulation, and low regimes were identified by the BHPD and its derivative curve. Research results show that: (i) The BHPD derivative curve has a 1/2 slope line, V-shape, and 1 slope line in reservoir linear flow regime, inter-porosity flow regime, and interference flow regime, respectively. (ii) The drop rate of pressure increases with the increase of formation transmissibility and storability. The bigger the fracture storability, the more obvious the V-shape feature in the derivative curve of BHPD. As the inter-porosity flow coefficient increases, the V-shape feature emerges later. (iii) The beginning time of the interference flow becomes later when the interference distance increases. When the injection rate trends to the production rate, the BHPD curve shows a slight drop and its derivative curve has an intermittent rupture. (iv) The influence of the gravity effect is not ignored. Due to the gravity effect, the BHPD interfered by constant injection well like the BHPD's behavior interfered by the closed boundary. This work provides technical support for capturing the source and degree of interference from well group in the heterogeneous fractured anticline reservoir.
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非均质裂缝性背斜油藏多注井干扰直井压降响应特征
裂缝性背斜油藏的开发多采用顶部的一套连续生产井和底部的一套连续注水井。生产井经常受到多口注水井的干扰,但有关多口注水井干扰的研究很少。为了解决这一问题,建立了多口注水井干扰生产井的扩展井底压降响应模型,以捕捉注水井干扰和重力效应。通过软件数值模拟验证了模型的正确性,并利用BHPD及其导数曲线识别出了低区。研究结果表明:①BHPD导数曲线在储层线性流型、孔隙间流型和干涉流型中分别呈现1/2斜率线、v型和1斜率线;(ii)压力下降速率随地层渗透性和储存性的增加而增加。裂缝可储存性越大,BHPD导数曲线的v型特征越明显。随着孔隙间流动系数的增大,v型特征逐渐显现。(iii)随着干涉距离的增加,干涉流开始时间变晚。当注入速度与产量趋势一致时,BHPD曲线略有下降,其导数曲线呈间歇性破裂。(四)重力效应的影响不容忽视。由于重力效应,连续注入井对BHPD的干扰与封闭边界对BHPD行为的干扰类似。该工作为非均质裂缝性背斜储层井组的干扰源和干扰程度的捕捉提供了技术支持。
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来源期刊
CiteScore
6.40
自引率
30.00%
发文量
213
审稿时长
4.5 months
期刊介绍: Specific areas of importance including, but not limited to: Fundamentals of thermodynamics such as energy, entropy and exergy, laws of thermodynamics; Thermoeconomics; Alternative and renewable energy sources; Internal combustion engines; (Geo) thermal energy storage and conversion systems; Fundamental combustion of fuels; Energy resource recovery from biomass and solid wastes; Carbon capture; Land and offshore wells drilling; Production and reservoir engineering;, Economics of energy resource exploitation
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