Average Fracture Compressibility from Flowback Data

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2021-01-01 DOI:10.2118/204481-PA

S. Hossain, Obinna Ezulike, Yingkun Fu, H. Dehghanpour

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引用次数: 1

Abstract

We propose a novel method for estimating average fracture compressibility cf¯ during flowback process and apply it to flowback data from 10 multifractured horizontal wells completed in Woodford (WF) and Meramec (MM) formations. We conduct complementary diagnostic flow-regime analyses and calculate cf¯ by combining a flowing-material-balance (FMB) equation with pressure-normalized-rate (PNR)-decline analysis. Flowback data of these wells show up to 2 weeks of single-phase water production followed by hydrocarbon breakthrough. Plots of water-rate-normalized pressure and its derivative show pronounced unit slopes, suggesting boundary-dominated flow (BDF) of water in fractures during single-phase flow. Water PNR decline curves follow a harmonic trend during single-phase- and multiphase-flow periods. Ultimate water production from the forecasted harmonic trend gives an estimate of initial fracture volume. The cf¯ estimates for these wells are verified by comparing them with the ones from the Aguilera (1999) type curves for natural fractures and experimental data. The results show that our cf¯ estimates (4 to 22×10−5 psi−1) are close to the lower limit of the values estimated by previous studies, which can be explained by the presence of proppants in hydraulic fractures.

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根据反排数据得出的平均裂缝压缩性

我们提出了一种估算反排过程中平均裂缝压缩性cf¯的新方法，并将其应用于Woodford (WF)和Meramec (MM)地层的10口多缝水平井的反排数据。我们将流动-物料平衡(FMB)方程与压力归一化速率(PNR)下降分析相结合，进行补充性诊断流态分析，并计算cf¯。这些井的反排数据显示，在油气突破后，单相水产出时间长达2周。水率归一化压力及其导数图显示出明显的单位斜率，表明裂缝中水在单相流动过程中为边界主导流动。在单相流和多相流期间，水PNR下降曲线均呈谐波趋势。根据调和趋势预测的最终产水量可以估计初始裂缝体积。通过与Aguilera(1999)天然裂缝型曲线和实验数据进行比较，验证了这些井的cf值。结果表明，我们的cf¯估定值(4 ~ 22×10 - 5 psi - 1)接近先前研究估计值的下限，这可以解释为水力裂缝中存在支撑剂。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.