Integrated Carbonate Matrix Acidizing Model for Optimal Treatment Design and Distribution in Long Horizontal Wells

Li, Xiaohe; Gomaa, Ahmed M.; Nino-Penaloza, Andrea; Chaudhary, Saleem

doi:10.2118/173607-ms

Cited by 19 publications

(1 citation statement)

References 10 publications

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“…Matrix acidizing or matrix acidizing is one of the stimulation methods commonly used mainly in carbonate reservoirs. The stimulation method with matrix acidizing or matrix acidizing is considered as one of the stimulation methods that are quite effective in terms of the cost of activities where the stimulation process is categorized as simple and the ratio of success is quite good [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Post Treatment Acidizing Study on Carbonate Rock with Wormhole Radius Method

Warasta¹,

Sitaresmi

Rakhmanto

et al. 2021

Journal of Earth Energy Science, Engineering, and Technology

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The problem that generally occurs in production activities is that wells in producing conditions has a low production rate. This could be due to the low permeability value of the reservoir or the increase of the skin factor of the reservoir due to formation damage. This matrix acidizing stimulation method is considered as an effective method in terms of activity costs and the success ratio in carbonate rocks. One of the successes of increasing the permeability around the well area depends on how far the wormholes are formed around the well. The results showed that the fractal dimension and wormhole radius model approach can be used to analyze the post treatment skin effect after validating the field data. Further analysis was carried out by involving limestone and dolomite reservoirs which have different characteristics in terms of porosity, permeability and fractal dimensions. The two reservoirs require different volumes of acid injection to produce the same reduction in skin factor. In this research, it is found that the parameters of permeability ratio, fractal dimensions, acid concentration, rock porosity and type of lithology affect the post treatment skin factor.

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Section: Introductionmentioning

confidence: 99%

Post Treatment Acidizing Study on Carbonate Rock with Wormhole Radius Method

Warasta¹,

Sitaresmi

Rakhmanto

et al. 2021

Journal of Earth Energy Science, Engineering, and Technology

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Numerical investigation of fluid phase momentum transfer in carbonate acidizing

et al. 2022

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Insights of Wormhole Propagation During Carbonate Acidizing: A Comparison Between Constant Injection Pressure Versus Constant Volumetric Rate

Gomaa

Nino-Penaloza

Cutler

et al. 2018

Journal of Energy Resources Technology

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Acidizing of carbonate reservoirs is a common technique used to restore and enhance production by dissolving a small fraction of the rock to create highly conductive channels. Literature review reveals that most acidizing studies are focused on acid injection at a constant volumetric rate (CVR) instead of at a constant injection pressure (CIP). Therefore, the primary objective of the present work is to investigate the benefits and recommended applications of each technique. The study analyzes dissolution patterns and wormhole propagation rate. A coreflood study was conducted using different Indiana limestone cores to assess both techniques. Additionally, a two-dimensional (2D) wormhole model was used to mathematically describe the acidizing phenomena. The algorithm is based on a 2D radial flow system that iterates time to quantify wormhole propagation and injection rate. Wormhole velocity is calculated by an empirical laboratory model that depends on two parameters measured from core flow testing. Therefore, the algorithm captures the essential physics and chemistry of the acid reaction in a carbonate porous medium. The study confirmed that conical, wormhole, and branched types of acid dissolution patterns exist for both techniques (CVR or CIP). Unlike in the CVR technique, dissolution patterns during the CIP technique can change and tend toward a branched dissolution regime. The CIP technique required a lower acid volume to achieve a breakthrough in the conical dissolution regime and a higher acid volume to achieve a breakthrough in the branched dissolution regime compared to the CVR technique. In a dominant wormhole pattern, both techniques required nearly the same acid volume for a breakthrough. A computed tomography (CT) scan confirmed that the CIP technique developed a uniform wormhole at a low initial injection rate. For the CIP technique, the acid injection rate increased exponentially with the volume of the acid injected. The CIP technique is recommended for a low-permeability reservoir where acid injection at a high rate is not possible to avoid face dissolution wormhole patterns. On the other hand, the CVR technique is recommended for a medium—to the high-permeability reservoir where high acid injection rate can be achieved.

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Integrated Carbonate Matrix Acidizing Model for Optimal Treatment Design and Distribution in Long Horizontal Wells

Cited by 19 publications

References 10 publications

Post Treatment Acidizing Study on Carbonate Rock with Wormhole Radius Method

Post Treatment Acidizing Study on Carbonate Rock with Wormhole Radius Method

Numerical investigation of fluid phase momentum transfer in carbonate acidizing

Insights of Wormhole Propagation During Carbonate Acidizing: A Comparison Between Constant Injection Pressure Versus Constant Volumetric Rate

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