考虑应力敏感性和弹性外边界条件的双重孔隙度油藏试井模型

IF 1.2 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Geofluids Pub Date : 2023-11-16 DOI:10.1155/2023/4658604
Song Chol Kim, Song Guk Han, Yong Il Song, Jin Sim Kim, Myong Gun Hong
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引用次数: 0

摘要

应力敏感性和弹性外边界条件对储层流体流动特征的分析有很大影响。研究人员在分析流体流动特性时,分别考虑了应力敏感性和EOB条件,而没有同时考虑。因此,在试井分析中,误差是不可避免的。本文的主要目的是建立具有EOB的应力敏感性双孔储层试井模型,以提高试井数据分析的准确性。为此,建立了同时考虑应力敏感性和EOB的DPR试井模型,并给出了该模型的半解析解。在考虑EOB条件和渗透率应力敏感性的基础上,利用连续方程、运动方程、状态方程和基质与裂缝间渗流方程,综合考虑应力敏感性、井筒储集性和表皮,建立了含EOB的DPR渗流模型。为求解该模型,引入有效井半径,应用Pedrosa变换和微扰变换,将非线性偏微分方程转化为线性形式的偏微分方程。应用拉普拉斯变换,得到了Laplace空间的解析解,并对压强和压强导数(PPD)进行数值反演,绘制出了压强和压强导数(PPD)曲线。将该模型与不考虑SSP的EOB模型进行了比较,并利用实例数据对模型进行了验证。分析了参数对PPD曲线的敏感性。这项工作对于通过试井更准确地评价井和储层参数具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Well-Testing Model for Dual-Porosity Reservoir considering Stress-Sensitivity and Elastic Outer Boundary Condition
Stress sensitivity and the elastic outer boundary (EOB) condition have a great effect on the analysis of the characteristics of the fluid flow in a reservoir. When researchers analyzed the characteristics of the fluid flow, they have considered the stress sensitivity and the EOB condition separately but have not considered them simultaneously. Therefore, errors are inevitable during the analysis of well testing. The main object of this work is to present a well-testing model for stress-sensitivity dual-porosity reservoir (DPR) with EOB to improve the accuracy of the analysis of well-testing data. To this end, in this paper, we established a well-testing model for the DPR, considering the stress sensitivity and the EOB simultaneously, and presented its semianalytical solution. On the basis of the consideration of the EOB condition and stress sensitivity of permeability (SSP), a seepage model for the DPR with the EOB is built using the continuity equation, motion equation, state equation, and interporosity flow equation between matrix and fracture, which considers the stress sensitivity, wellbore storage, and skin. To solve this model, a nonlinear partial differential equation is changed into a linear form of a partial differential equation by introducing an effective well radius and applying Pedrosa’s transformation and perturbation transformation. Applying the Laplace transformation, an analytical solution in the Laplace space is obtained, and curves of pressure and pressure derivative (PPD) are drawn by numerically inverting them. The model is verified by comparing it with the EOB without consideration of SSP and using case data. The sensitivity of parameters on the curves of PPD is analyzed. This work may be significant for evaluating more accurately the parameters of wells and reservoirs using well testing.
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来源期刊
Geofluids
Geofluids 地学-地球化学与地球物理
CiteScore
2.80
自引率
17.60%
发文量
835
期刊介绍: Geofluids is a peer-reviewed, Open Access journal that provides a forum for original research and reviews relating to the role of fluids in mineralogical, chemical, and structural evolution of the Earth’s crust. Its explicit aim is to disseminate ideas across the range of sub-disciplines in which Geofluids research is carried out. To this end, authors are encouraged to stress the transdisciplinary relevance and international ramifications of their research. Authors are also encouraged to make their work as accessible as possible to readers from other sub-disciplines. Geofluids emphasizes chemical, microbial, and physical aspects of subsurface fluids throughout the Earth’s crust. Geofluids spans studies of groundwater, terrestrial or submarine geothermal fluids, basinal brines, petroleum, metamorphic waters or magmatic fluids.
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