An advanced fractal-based well testing model capturing fracture complexity in low permeability tight gas reservoirs

被引:0
|
作者
Wang, Kun [1 ,2 ]
Li, Li [2 ]
Xie, Mingying [2 ]
Dai, Jianwen [2 ]
Feng, Shasha [2 ]
Li, Min [1 ]
Huang, Ruijie [2 ]
Liu, Siyu [2 ]
机构
[1] Southwest Petr Univ, Key Lab Oil & Gas Reservoir Geol & Exploitat, Chengdu, Peoples R China
[2] Shenzhen Branch CNOOC Ltd, Nanhai East Petr Res Inst, Shenzhen Branch, Shenzhen, Peoples R China
来源
关键词
ultra-low permeability gas reservoir; characterization of fracture complexity; stress sensitivity; pressure dynamics; multi-stage fracturing horizontal wells; SHALES; FLOW;
D O I
10.3389/fenrg.2024.1356183
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The study of heterogeneous and complex oil and gas reservoirs poses a significant challenge due to the problem of unstable seepage flow. This research investigates the non-linear seepage flow patterns in such reservoirs, with a particular focus on ultra-low permeability tight gas reservoirs, using fractal theory. By analysing the scale invariance in the seepage flow of ultra-low permeability tight gas reservoirs, we have derived a fractal geometric expression based on the capillary pressure curve. This expression was integrated with mercury intrusion porosimetry to study the fractal dimension of ultra-low permeability reservoirs. Our experimental results indicate the presence of fractal characteristics in ultra-low permeability tight gas reservoirs. Based on this, we have investigated the fractal nature of matrix porosity and fractures and their effect on the stress sensitivity of ultra-low permeability tight gas reservoirs. This led to the development of a new fractal model for seepage flow in these reservoirs, which takes into account the non-Darcy flow behaviour of gas in nanoscale pores. The mathematical model was simplified using point source solutions and regular perturbation methods. The analysis shows that the fractal parameters of the matrix and fractures, together with the adsorption coefficients and the permeability modulus, have a significant influence on the dynamic pressure behaviour. The effects of slip and diffusion coefficients and stress sensitivity on the dynamics were also investigated. The pressure dynamics curves of ultra-low permeability tight gas reservoirs show distinct differences from those of homogeneous reservoirs and conventional dual porosity reservoirs. This study not only reveals the unique dynamic pressure characteristics of ultra-low permeability tight gas reservoirs, but also shows that the traditional reservoir models are, under certain conditions, special cases of the model proposed in this paper.
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页数:16
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共 35 条
  • [1] A FRACTAL MODEL FOR GAS APPARENT PERMEABILITY IN MICROFRACTURES OF TIGHT/SHALE RESERVOIRS
    Wang, Shifang
    Wu, Tao
    Cao, Xiuying
    Zheng, Qiusha
    Ai, Min
    [J]. FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY, 2017, 25 (03)
  • [2] A fractal permeability model for the dual-porosity media of tight gas reservoirs
    Zeng, Fanhui
    Zhang, Tao
    Yang, Jie
    Guo, Jianchun
    Zhang, Qiang
    Ren, Wenxi
    [J]. ENERGY EXPLORATION & EXPLOITATION, 2021, 39 (01) : 224 - 242
  • [3] Parametric investigation of well testing analysis in low permeability gas condensate reservoirs
    Mohammadi, Hossein
    Sedaghat, Mohammad Hossein
    Manshad, Abbas Khaksar
    [J]. JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING, 2013, 14 : 17 - 28
  • [4] FRACTURE EVALUATION WITH PRESSURE TRANSIENT TESTING IN LOW-PERMEABILITY GAS-RESERVOIRS
    LEE, WJ
    HOLDITCH, SA
    [J]. JOURNAL OF PETROLEUM TECHNOLOGY, 1981, 33 (09): : 1776 - 1792
  • [5] Production Decline Analysis of Tight Conglomerate Reservoirs with Small Well Spacing, Based on the Fractal Characteristics of Fracture Networks
    Li, Xiaoshan
    Song, Junqiang
    Pan, Hong
    Gu, Kaifang
    Wang, Shuo
    Yang, Liu
    You, Haoyu
    Wang, Li
    Wang, Xin
    Li, Shihong
    Li, Ting
    Luo, Guanxing
    [J]. MINERALS, 2022, 12 (11)
  • [6] Laboratory Testing of Fracture Conductivity Damage by Foam-Based Fracturing Fluids in Low Permeability Tight Gas Formations
    Wilk-Zajdel, Klaudia
    Kasza, Piotr
    Maslowski, Mateusz
    [J]. ENERGIES, 2021, 14 (06)
  • [7] Effects of matrix permeability and fracture on production characteristics and residual oil distribution during flue gas flooding in low permeability/tight reservoirs
    Chen, Hailong
    Li, Haifeng
    Li, Zhaomin
    Li, Songyan
    Wang, Yujun
    Wang, Jian
    Li, Binfei
    [J]. JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING, 2020, 195
  • [8] A Novel Model for Well Production Performance Estimate in Low-Permeability and Tight Reservoirs Considering Stress Sensitivity
    Dong, Mingda
    Shi, Xuedong
    Bai, Jie
    Yang, Zhilong
    Qi, Zhilin
    [J]. JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME, 2020, 142 (09):
  • [9] Numerical Simulation of the Non-Darcy Flow Based on Random Fractal Micronetwork Model for Low Permeability Sandstone Gas Reservoirs
    Li, Juhua
    Chen, Chen
    [J]. GEOFLUIDS, 2020, 2020
  • [10] Well Testing Model of Multiple Fractured Horizontal Well with Consideration of Stress-Sensitivity and Variable Conductivity in Tight Gas Reservoirs
    Wu, Zhongwei
    Cui, Chuanzhi
    Wang, Zhen
    Sui, Yingfei
    Jia, Peifeng
    Tang, Wenhao
    [J]. MATHEMATICAL PROBLEMS IN ENGINEERING, 2018, 2018