Prediction of rock strength with matrix acidizing stimulation and induced wormhole by computational simulation methods

Jahani, Nazanin; Berge, Geir Thore; Haugen, Bjørn Olav

doi:10.1201/b16955-224

Cited by 4 publications

(2 citation statements)

References 1 publication

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“…Moreover, CO 2 availability issue and the cost of such project offshore hinder implementation of such project even further. Adverse effects of other techniques such as matrix acidizing on the mechanical stability of chalks , and other rock types are also well documented in the literature. This study aims to investigate a novel solvent-based EOR method that can match the performance of CO 2 injection but does not pose its limitations in the chalk fields of the North Sea.…”

Section: Introductionmentioning

confidence: 98%

On Oil Recovery Mechanisms and Potential of DME–Brine Injection in the North Sea Chalk Oil Reservoirs

Javanmard

Seyyedi

Nielsen

2018

Ind. Eng. Chem. Res.

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North Sea tight chalk oil reservoirs are well-known for their submicron pore throat sizes and heterogeneous porosity pattern that includes fractures and microfractures. The host rock of these reservoirs is extremely sensitive and can easily react with the injected fluid, which in turn adversely affects the permeability and thus injectivity. The combined effect of these parameters makes oil production in chalk reservoirs extremely difficult. A novel solvent-based enhanced oil recovery (EOR) method that can address these issues is investigated for the first time in the chalk reservoirs. We thouroughly investigate the oil recovery potential and dominant oil recovery mechanisms by dimethyl ether (DME)−brine injection under conditions pertinent to the North Sea tight chalk oil reservoirs. A series of systematically designed high-pressure and high-temperature flooding experiments were carried out using reservoir core and crude oil. The experimental results revealed the strong oil recovery potential of tertiary DME−brine injection with two different DME contents. Furthermore, both secondary and tertiary DME−brine injection scenarios significantly improved the oil recovery with the better performance in the secondary scenario. The results show that the dominant oil recovery mechanism is rapid and strong oil swelling is caused by the preferential partitioning of DME into the oil phase. During DME−brine injection, no indications of rock mineral dissolution and adverse effects on rock permeability were observed. This is one of the advantages of this method over CO 2 , CO 2 −water alternating gas (WAG), and alkaline injections in which the EOR agent causes calcite dissolution, wormhole formation, and scaling issues in fragile chalk reservoirs.

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Section: Introductionmentioning

confidence: 98%

On Oil Recovery Mechanisms and Potential of DME–Brine Injection in the North Sea Chalk Oil Reservoirs

Javanmard

Seyyedi

Nielsen

2018

Ind. Eng. Chem. Res.

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“…Moreover, it is also shown that production-induced stress can reorient fluid flow direction [10][11]. Jahani et al [12] reveals that increasing of effective stress leads to the higher pressure gradient in the wormhole created in acidizing fracturing.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Stress Distribution Around a Well due to Fluid Flow in Poroelastic Tight oil and Gas Formation: An Application of Finite Element Method

Zhang¹,

Shaik²,

Rahman³

2019

International Journal of Applied Engineering Research

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Fluid injected around a wellbore in an oil and gas formation will affect the stress distribution which may change the stress state. This makes the hydraulic fracture more complex to propagate. Stress distribution around a wellbore is investigated in different fluid flowing conditions. The partial coupling strategy is applied to get effective stress from the stress model and fluid flow model. Finite Element Method is used to calculate the total stress distribution and the effective stress with fluid pressure. A numerical model is developed and verified by a commercial software and analytical solution. The developed numerical model is applied to generate the effective stress distribution. Numerical experiments are conducted to find out the factors to the effective stress. The results from current model suggest that it can effectively capture the total stress distribution and effective stress distribution around the wellbore. Model also suggests that fluid pressure has a significant effect on the stress distribution. The results from numerical experiments show that effective stress increases with wellbore radius and rock compressibility, but decreases with the fluid injection rate and rock compressibility. The results of this study can be used to improve the simulation of stress distribution near a wellbore for hydraulic fracturing design.

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Coupled fluid flow and elasto-plastic damage analysis for fractured porous chalk with induced wormhole

Jahani

Haugen

Berge

2015

International Journal of Rock Mechanics and Mining Sciences

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Prediction of rock strength with matrix acidizing stimulation and induced wormhole by computational simulation methods

Cited by 4 publications

References 1 publication

On Oil Recovery Mechanisms and Potential of DME–Brine Injection in the North Sea Chalk Oil Reservoirs

On Oil Recovery Mechanisms and Potential of DME–Brine Injection in the North Sea Chalk Oil Reservoirs

Numerical Simulation of Stress Distribution Around a Well due to Fluid Flow in Poroelastic Tight oil and Gas Formation: An Application of Finite Element Method

Coupled fluid flow and elasto-plastic damage analysis for fractured porous chalk with induced wormhole

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