Matrix acidization in fractured porous media with the continuum fracture model and thermal Darcy-Brinkman-Forchheimer framework

Wu, Yuanqing; Kou, Jisheng; Sun, Shuyu

doi:10.1016/j.petrol.2022.110210

Cited by 11 publications

(4 citation statements)

References 25 publications

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“…Daobing Wang et al [20] established a comprehensive fracture index model that comprehensively considers the thermal effect and fracture toughness under different temperatures and confining pressures. Yuanqing Wu et al [21] used the CF model and DBF framework to simulate matrix acidification in fractured porous media, and the simulation results of this work were compared with Khoei's work, which proved the rationality of this work. On the basis of improving the DBF framework, Yuanqing Wu et al [22] introduced the energy balance equation into the improved DBF framework and gave the thermal DBF framework.…”

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confidence: 63%

Study and application of temporary plugging agent for temporary plugging acid fracturing in ultra-deep wells of Penglai gas field

Wang¹,

Fan²

2023

Front. Phys.

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The burial depth of Penglai gas field reservoir in the Sichuan Basin of China exceeds 7,000 m, and the reservoir temperature is 160°C. Penglai gas field belongs to the fractured reservoir, and there are many natural fractures distributed in the reservoir. Natural fractures are not only the storage place of natural gas, but also the transportation channel of natural gas. Gas wells mainly increase natural gas production through acid fracturing. In the early stage, Penglai Gas Field mainly used gelled acid fracturing technology to create an artificial fracture in the reservoir by injecting a large amount of acid fluid. However, the stimulation range of gelled acid fracturing is very small. After acid fracturing, gas wells can only produce 120,000 cubic meters of natural gas per day. To obtain higher natural gas production, this paper proposes a multi-stage temporary acid fracturing technology that can greatly improve the effect of acid fracturing. The temporary plugging agent for acid fracturing has been developed to meet the high-temperature requirements of the Penglai gas field. Based on the simulation of fracture propagation, the feasibility of acid fracturing expansion of natural fractures in the Penglai Gas Field is clarified. Fiber and granular temporary plugging agents that meet the plugging strength greater than 20 MPa are selected by using the dynamic temporary plugging instrument. MultiFracS software is used to optimize the multi-stage temporary acid fracturing process parameters. The research results in this paper have been applied to wells PS101, PS102, and PS103. After fracturing, compared with the gelling acid fracturing, the natural gas production has increased by more than three times, and the multi-stage temporary plugging acid fracturing has achieved a very good stimulation effect.

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confidence: 63%

Study and application of temporary plugging agent for temporary plugging acid fracturing in ultra-deep wells of Penglai gas field

Wang¹,

Fan²

2023

Front. Phys.

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“…Zhang et al [20] used large-scale true triaxle simulation experiments to believe that perforations change the distribution of ground stress around the well, thereby affecting the initiation and propagation of fracturing fractures. Wu et al [21] studied the impact of perforating parameters on the initiation and propagation of fracturing fractures under different ground stress differences through true triaxle physical model experiments, thereby optimizing perforating parameters that improve reconstruction efficiency. Yuanqing et al [22] simulated matrix acidification in a fractured porous medium using the CF model and DBF framework and validated it by comparing it with the simulations of Khoei.…”

Section: Introductionmentioning

confidence: 99%

Finite element study on the initiation of new fractures in temporary plugging fracturing

Xing¹,

Wu²,

Zhou³

et al. 2023

Front. Phys.

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Hydraulic fracturing technology is an important means to efficiently exploit unconventional oil and gas reservoirs. As the development of oil and gas fields continues at a high rate, the life cycle of oil and gas wells has been significantly shortened. Fracture sealing is often used to transform oil and gas reservoirs, maintaining long-term economic development benefits. Multiple high-conductivity channels were created between the borehole and the reservoir through temporary sealing of fractures near the contaminated zone. This extended the recovery range and further improved the recovery of oil and gas. A mathematical model was developed to predict the distribution of stress around the artificial fracture prior to the rupture of the seal. Finite element software was used to model the stress distribution around a reservoir containing natural and artificial fractures. We discuss the mechanical conditions for the initiation of a new fracture and the optimal timing for fracture sealing. The prediction of the propagation and propagation trajectories of the new fracture is revealed, and the behavior rules for the initiation and steering propagation of the new fracture are clarified. These results can facilitate theoretical studies and on-site technical optimization of fracture sealing.

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“…On the other hand, the popular numerical methods used to model multiphase flow during CO 2 sequestration mainly include the finite element method (FEM), the finite volume method (FVM), the unified pipe network method (UPNM), and the mixed finite element method. However, the mesh refinement was necessary to solve the discontinuity of fracture with these numerical methods which would lead to additional computational cost when dealing with complex fracture network problems 44,45 . The extended finite element method (XFEM) is a particular finite element method based on the partition of unity method.…”

Section: Introductionmentioning

confidence: 99%

“…these numerical methods which would lead to additional computational cost when dealing with complex fracture network problems. 44,45 The extended finite element method (XFEM) is a particular finite element method based on the partition of unity method. In XFEM, the enrichment functions are added to the approximation of field quantity to characterize the discontinuity of field quantity across the fracture surfaces.…”

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confidence: 99%

A two‐phase flow extended finite element technology modeling CO₂ in fractured porous media

et al. 2022

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Carbon dioxide (CO 2 ) geological sequestration technology is an attractive means of reducing greenhouse gas emissions. This work aims to seek the transport mechanism of CO 2 in fractured porous media. A two-phase flow extended finite element model is developed in this paper. The two-phase flow in the fracture and porous matrix are all considered in the model development. We present numerical simulations under 2D linear flow conditions with specific and sensitivity analysis about fracture properties, capillary pressure, relative permeability, reservoir heterogeneity, and properties. It is found that fracture will dominate the CO 2 transport when the intersection angle of fracture orientation and injection direction is less than 90°, and CO 2 flows into deeper regions along the fracture. It is significant to find a suitable capillary pressure and relative permeability model which matches the microscopic pore structure when simulating CO 2 geological sequestration in fractured media. Using the Brooks-Corey equation for capillary pressure and relative permeability, the CO 2 transport efficiency would increase by around 16% compared to the Van Gneuchten equation. Besides, the CO 2 phase and properties evolution during CO 2 geological sequestration has a great influence on CO 2 transport efficiency., CO 2 transport efficiency is reduced by around 18% due to an increase in CO 2 density and viscosity when considering CO 2 properties evolution.

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Matrix acidization in fractured porous media with the continuum fracture model and thermal Darcy-Brinkman-Forchheimer framework

Cited by 11 publications

References 25 publications

Study and application of temporary plugging agent for temporary plugging acid fracturing in ultra-deep wells of Penglai gas field

Study and application of temporary plugging agent for temporary plugging acid fracturing in ultra-deep wells of Penglai gas field

Finite element study on the initiation of new fractures in temporary plugging fracturing

A two‐phase flow extended finite element technology modeling CO₂ in fractured porous media

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Matrix acidization in fractured porous media with the continuum fracture model and thermal Darcy-Brinkman-Forchheimer framework

Cited by 11 publications

References 25 publications

Study and application of temporary plugging agent for temporary plugging acid fracturing in ultra-deep wells of Penglai gas field

Study and application of temporary plugging agent for temporary plugging acid fracturing in ultra-deep wells of Penglai gas field

Finite element study on the initiation of new fractures in temporary plugging fracturing

A two‐phase flow extended finite element technology modeling CO2 in fractured porous media

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A two‐phase flow extended finite element technology modeling CO₂ in fractured porous media