基于速率/压力瞬态分析的变井底压力多井水平井干扰流诊断

2区 工程技术 Q1 Earth and Planetary Sciences
Hongyang Chu , Tianbi Ma , Weiyao Zhu , W. John Lee
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引用次数: 0

摘要

水平多井场是非常规油藏中常用的井场。随着加密井和水力压裂,多个多裂缝水平井之间的干扰已成为一个主要问题。电流速率瞬态分析(RTA)假设非常规地层包含单个MFHW。本研究介绍了一种新的多MFHW解决方案和相关分析方法,用于分析多MFHWs系统中目标井率的性能。恒定井底压力(BHP)条件和拉普拉斯变换可用于获得瞬态流的多MFHW解。我们使用各种常数BHP解的叠加来研究各种裂缝和MFHWs之间的干扰。使用拉普拉斯域中的可变无量纲BHP函数计算目标井的可变BHP,而不执行任何卷积或反褶积。对于涉及偏移MFHW和具有可变BHP的多MFHW的情况,使用商业数值模拟器对所提出的方法进行了严格验证。通过这种多MFHW分析,我们可以使用多MFHWs系统的总材料平衡来分析井场中的目标井。偏移井干扰经常发生在目标井水力裂缝中无限作用径向流(IARF)开始之后。这导致椭圆流和IARF的压力导数曲线以及速率归一化压力(RNP)导数增加。逆半对数导数呈现相反的趋势。所提出的偏差压力积分和RNP可用于以独特的方式诊断偏移井流速引起的流动区域,分别显示IARF、横流和边界主导流(BDF)期间的水平线、V形倾角和单位斜率。井距敏感性分析表明,随着井距的增加,井间的“过渡流”从椭圆流过渡到地层线性流,在更常见的情况下可以表现出过渡流特征。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Flow diagnosis in variable bottom hole pressure multi-well horizontal pad with well interference using rate/pressure transient analysis

Horizontal multi-well pads are frequently used in unconventional reservoirs. Along with infill wells and hydraulic fracturing, interference between multiple multi-fractured horizontal wells (MFHWs) has become a major concern. The current rate transient analysis (RTA) makes the assumption that the unconventional formation contains a single MFHW. This study introduces a novel multi-MFHW solution and associated analysis methodology for analyzing the performance of targeted well rates in a multi-MFHW system.

The constant bottom-hole pressure (BHP) condition and the Laplace transform can be used to obtain multi-MFHW solutions for transient flow. We investigated interference between various fractures and MFHWs using the superposition of various constant BHP solutions. The variable BHP of the targeted well is calculated using a variable dimensionless BHP function in the Laplace domain without performing any convolution or deconvolution. The proposed method is rigorously validated using a commercial numerical simulator for cases involving offset MFHWs and multi-MFHW with variable BHP. With this multi-MFHW analysis, we can analyze a target well in the pad using the total material balance of the multi-MFHW system. Offset well interference frequently occurs following the onset of infinite-acting radial flow (IARF) in the target well's hydraulic fracture. It results in an increase in the pressure derivative curves for elliptical flow and IARF, as well as the rate-normalized pressure (RNP) derivative. Inverse semi-log derivatives exhibit the inverse trend. The proposed deviation pressure integral and RNP can be used to diagnose the flow region caused by the offset well's flow rate in a unique manner, displaying the horizontal line, V-shaped dip, and unit slope, respectively, during IARF, cross flow, and boundary-dominated flow (BDF). Sensitivity analysis of well spacing demonstrates that as well spacing increases, the “transition flow” between wells transitions from elliptical to formation linear flow and can exhibit transitional flow characteristics in more common cases.

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来源期刊
Journal of Petroleum Science and Engineering
Journal of Petroleum Science and Engineering 工程技术-地球科学综合
CiteScore
11.30
自引率
0.00%
发文量
1511
审稿时长
13.5 months
期刊介绍: The objective of the Journal of Petroleum Science and Engineering is to bridge the gap between the engineering, the geology and the science of petroleum and natural gas by publishing explicitly written articles intelligible to scientists and engineers working in any field of petroleum engineering, natural gas engineering and petroleum (natural gas) geology. An attempt is made in all issues to balance the subject matter and to appeal to a broad readership. The Journal of Petroleum Science and Engineering covers the fields of petroleum (and natural gas) exploration, production and flow in its broadest possible sense. Topics include: origin and accumulation of petroleum and natural gas; petroleum geochemistry; reservoir engineering; reservoir simulation; rock mechanics; petrophysics; pore-level phenomena; well logging, testing and evaluation; mathematical modelling; enhanced oil and gas recovery; petroleum geology; compaction/diagenesis; petroleum economics; drilling and drilling fluids; thermodynamics and phase behavior; fluid mechanics; multi-phase flow in porous media; production engineering; formation evaluation; exploration methods; CO2 Sequestration in geological formations/sub-surface; management and development of unconventional resources such as heavy oil and bitumen, tight oil and liquid rich shales.
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