Investigation of Acid-Induced Emulsion and Asphaltene Precipitation in Low Permeability Carbonate Reservoirs

Almubarak, Tariq; AlKhaldi, Mohammed; Almubarak, Majed; Rafie, Majid; Al-Ibrahim, Hussain; Albokhari, Nooreddeen

doi:10.2118/178034-ms

Cited by 24 publications

(7 citation statements)

References 7 publications

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“…To simulate the process of oil degassing in the bottom-hole formation zone, pumping of oil at a constant pressure, which is less than saturation pressure of the oil saturated by gas. As a result of this, asphaltenes contained in the oil, will be precipitated mainly within the pore space of the core sample [8,14,17,22,25,27,31,43]. 6.…”

Section: Description and Application Of Equipment And Processesmentioning

confidence: 99%

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The Application of X-ray Micro Computed Tomography (Micro-CT) of Core Sample for Estimation of Physicochemical Treatment Efficiency

et al. 2015

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Today, the oil industry faces a number of problems encountered in exploration and exploitation of oil and gas fields. At the same time, thanks to the joint efforts of experts in various fields of science and technology, there are new kinds of specialized research, which in combination with other methods of laboratory and field testing can improve the efficiency of existing technologies through an integrated approach to data acquisition and analysis. At present, increasing attention of researchers is drawn to a variety of nondestructive testing methods (research) associated with the use of various types of computer tomography (X-ray, magnetic resonance and others.). Application of research of this type in combination with other methods is wide enough and is only limited by the scientific training and applied knowledge as well as the scientists' ability to invent. Particular attention is paid by the authors of this work to the following core areas of laboratory research: the study of the structure of the pore space of rock samples in order to evaluate the reservoir properties of the productive formation, complex filtration and tomographic studies to assess the extent of damage to the reservoir (as a result of the acid treatment, alkali treatment, hydraulic fracturing, killing operations on production and injection wells, evaluation of the depth of penetration of drilling mud filtrate into the formation, precipitation of resins, asphaltenes and paraffin in the bottomhole formation zone). Simulation of this process in a specially equipped laboratory allows for the assessment of the depth of penetration of the gelling agent into the formation or will help to establish the effectiveness of other ways to reduce water production, change the injectivity profile of injection wells, etc.This article presents the results of several types of special studies and a series of data to draw conclusions about the high significance of the research. The paper describes the standard type of study to assess the porosity of productive stratum rock (for example, collectors with hard to recover reserves of the Bazhenov Formation of Western Siberia), the method of evaluation of formation damage resulting from asphaltene deposits in the operation of wells with bottomhole pressure below the gas saturation pressure, and the results of the application of computer tomography in the evaluation of the results of classic acid treatment of bottom-hole zone of wells in carbonate hydrocarbon (oil and gas) bearing reservoirs. Studies have shown that the application of computer tomography in some cases, allows to obtain data on the processes of reduction or increase in permeability taking place in a core due to the introduction of any of compositions in the bottomhole formation zone. Construction of three-dimensional models can improve the degree of comprehensibility and effectively visualize data of models built (for example, models of porous space and the rock matrix). Ultimately, the results of X-ray computer tomography are very easy to understand, ...

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Section: Description and Application Of Equipment And Processesmentioning

confidence: 99%

“…For example, the use of various reagents and solvents to remove deposits of asphaltenes, resins and waxes, the application of surfactants, and special physical (e.g. wave) methods on reservoir [6][7][8][9][10]14,16,18,[26][27][28]31,37].…”

Section: Description and Application Of Equipment And Processesmentioning

confidence: 99%

The Application of X-ray Micro Computed Tomography (Micro-CT) of Core Sample for Estimation of Physicochemical Treatment Efficiency

et al. 2015

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“…However, they ignored the acid-asphaltene reactions, acid-asphaltene sludge formation, and its effects on wormholing process. Similarly, AlMubarak et al [48] investigated the acid-induced emulsion and the precipitation of asphaltene in low permeability reservoir and they found that acid systems are not compatible with several oils when they interact with each other. Furui et al [38] observed a mismatch in predicting wormhole formation during matrix acidizing between theoretically and conventionally developed models as opposed to field data [41].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, in this study, the experimental data of the above sources [43][44][45][46][47][48] in the literature were used to propose a model, which considers simultaneous acid-rock and acid-asphaltene reactions as well as acid-asphaltene sludge formation. Furthermore, the effect of several factors on wormholing was investigated in both presence and absence of asphaltene slug formation.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Approach to Investigate the Impact of Acid-Asphaltene Sludge Formation on Wormholing During Carbonate Acidizing

Khurshid

Al-Shalabi

Afgan

et al. 2021

Journal of Energy Resources Technology

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Carbonate acidization is the process of creating wormholes by injecting acid to increase reservoir permeability and oil production. Nevertheless, some reservoir oils are problematic with low asphaltene stability, which affects the wormholing process. The interactions between acid, rock, and asphaltene lead to acid-asphaltene sludge formation, which reduces oil productivity and acid injectivity. Neglecting this sludge formation, leads to over predicting the depth of the wormhole penetration. Therefore, a numerical model was developed in this study to provide a better understanding of acid-asphaltene sludge formation effect on wormhole creation and propagation in carbonates. A 1D radial model was developed by coupling fluid flow equations in porous media with asphaltene deposition and acid-asphaltene reactions. Then, the developed model was validated and utilized to investigate the effects of different parameters on wormholing including asphaltene presence, acid injection volume and concentration, formation temperature and porosity, and asphaltene concentration. Results showed that acid injection in carbonates with asphaltenic-oils reduces wormhole penetration from 40% to total pore blockage as opposed to reservoirs without asphaltene deposition. The findings also highlighted that shallow wormhole penetration is more pronounced with high volume of acid injection, high porous formations, less diluted acid, and high concentration of asphaltene. In addition, there is an optimum acid injection volume at which wormhole penetration is high and its infiltration is deep into the formation. This is the first work to discuss modeling of acid-asphaltene sludge formation and subsequent wormhole development in carbonates, which is particularly important for problematic crude oils.

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“…During well interventions involving HCl and when the latter interacts with the formation oil, there may occur asphaltene precipitation in a separate phase with some precipitation of sediments [6,7], which influences the efficiency of oil production and preparation processes.…”

Section: Introductionmentioning

confidence: 99%

Intensification of the process of decomposition of oil-water emulsions stabilized with hydrochloric acid

2021

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The major goal of oil and gas companies working in the oilfields on the late stages of development is to maintain a high level of hydrocarbon production. Analysis of well intervention techniques (WITs) in the oilfields of the Samara Region shows that most often the bottomhole area is treated with reagents containing hydrochloric acid, which significantly effects the efficiency of well fluid preparation processes. The paper summarizes the results of studies of the impact of hydrochloric acid on the rheological and near-surface properties of water-in-oil emulsions (WOEs). It is shown that the presence of acid and/or products of its reaction with the oil increases the stability of the water-in-oil emulsion. To enhance the process of decomposition of the water-in-oil emulsion stabilized with hydrochloric acid, a reagent was developed based on the non-ionic surfactants, alkaline agent and solvent, providing a significant reduction of the viscosity of water-in-oil emulsions and improving the efficiency of their decomposition.

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Investigation of Acid-Induced Emulsion and Asphaltene Precipitation in Low Permeability Carbonate Reservoirs

Cited by 24 publications

References 7 publications

The Application of X-ray Micro Computed Tomography (Micro-CT) of Core Sample for Estimation of Physicochemical Treatment Efficiency

The Application of X-ray Micro Computed Tomography (Micro-CT) of Core Sample for Estimation of Physicochemical Treatment Efficiency

A Numerical Approach to Investigate the Impact of Acid-Asphaltene Sludge Formation on Wormholing During Carbonate Acidizing

Intensification of the process of decomposition of oil-water emulsions stabilized with hydrochloric acid

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