Previous Article in Journal
Particle Tracking Velocimetry Measurements and Simulations of Internal Flow with Induced Swirl
 
 
Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
Journals
Fluids
Volume 10
Issue 12
10.3390/fluids10120324
fluids-logo
Submit to this Journal Review for this Journal Propose a Special Issue
► Article Menu

Article Menu

share Share announcement Help format_quote Cite question_answer Discuss in SciProfiles
first_page
settings
Order Article Reprints
Font Type:
Arial Georgia Verdana
Font Size:
Aa Aa Aa
Line Spacing:
Column Width:
Background:
This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Pressure Transient Analysis for Vertical Well Drilled in Filled-Cave in Fractured Reservoirs

by
Wenyang Shi
1,2,*,
Gerui Wang
1,
Shaokai Rong
1,
Jiazheng Qin
2,
Juan Chen
1,
Lei Tao
1,
Jiajia Bai
1,
Zhengxiao Xu
1 and
Qingjie Zhu
1
1
School of Petroleum and Natural Gas, Changzhou University, Changzhou 213164, China
2
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
*
Author to whom correspondence should be addressed.
Fluids 2025, 10(12), 324; https://doi.org/10.3390/fluids10120324
Submission received: 28 October 2025 / Revised: 18 November 2025 / Accepted: 2 December 2025 / Published: 5 December 2025
Versions Notes

Abstract

For capturing dynamic information about a filled-cave in the fractured reservoir, a novel Pressure Transient Analysis (PTA) analytical model for a well located at the filled-cave is established. In this new model, we consider the stress-sensitivity of the filled-cave and the inter-porosity flow of fracture. First, Perturbation transformation was used to obtain the pressure distribution in the filled-cave zone. Then, the Warren–Root model was applied to establish the pressure solution in the fractured reservoir. Next, the pressure and its derivative are obtained by the Laplace transformation and Steftest inversion. Lastly, the Bottomhole Pressure (BHP) and Bottomhole Pressure Derivative (BHPD) combined curve reveals the flow regimes of this novel model. The results show the composite model can be used to characterize the fractured reservoir with the filled-caves, and its flow follows the composite flow regimes. The spherical flow has an obvious slope of 0.5 on the BHPD curve, which can identify the size of the filled-caves. The boundary flow can be used to identify stress-sensitivity. Affected by the stress-sensitivity of the filled-cave, the BHPD’s slope of the boundary flow will be greater than 1. This research work provides technical support for capturing cave and fracture parameters in the fractured reservoir.
Keywords: pressure transient analysis; fractured reservoir; filled-cave; stress sensitivity; dual porous medium; composite reservoir; spherical flow pressure transient analysis; fractured reservoir; filled-cave; stress sensitivity; dual porous medium; composite reservoir; spherical flow

Share and Cite

MDPI and ACS Style

Shi, W.; Wang, G.; Rong, S.; Qin, J.; Chen, J.; Tao, L.; Bai, J.; Xu, Z.; Zhu, Q. Pressure Transient Analysis for Vertical Well Drilled in Filled-Cave in Fractured Reservoirs. Fluids 2025, 10, 324. https://doi.org/10.3390/fluids10120324

AMA Style

Shi W, Wang G, Rong S, Qin J, Chen J, Tao L, Bai J, Xu Z, Zhu Q. Pressure Transient Analysis for Vertical Well Drilled in Filled-Cave in Fractured Reservoirs. Fluids. 2025; 10(12):324. https://doi.org/10.3390/fluids10120324

Chicago/Turabian Style

Shi, Wenyang, Gerui Wang, Shaokai Rong, Jiazheng Qin, Juan Chen, Lei Tao, Jiajia Bai, Zhengxiao Xu, and Qingjie Zhu. 2025. "Pressure Transient Analysis for Vertical Well Drilled in Filled-Cave in Fractured Reservoirs" Fluids 10, no. 12: 324. https://doi.org/10.3390/fluids10120324

APA Style

Shi, W., Wang, G., Rong, S., Qin, J., Chen, J., Tao, L., Bai, J., Xu, Z., & Zhu, Q. (2025). Pressure Transient Analysis for Vertical Well Drilled in Filled-Cave in Fractured Reservoirs. Fluids, 10(12), 324. https://doi.org/10.3390/fluids10120324

Article Metrics

Article metric data becomes available approximately 24 hours after publication online.
Back to TopTop