Carbonate Stimulation Using Chelating Agents: Improving the Treatment Performance by Optimizing the Fluid Properties

Barri, Assad; Hassan, Amjed; Mahmoud, Mohamed

doi:10.1021/acsomega.1c07329

Cited by 9 publications

(4 citation statements)

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“… 18 , 19 Chelating agents are chemicals with many applications in different industries. 20 − 24 They were introduced as an efficient barite dissolver. 19 , 25 Different chelating agents were tested including DTPA, EDTA, HEDTA, DOCTA, NTA, and TTHA to dissolve barite (i.e., Table A1 shows the full name of each chelating agent).…”

Section: Introductionmentioning

confidence: 99%

“…Removing the barite scale is not a trivial task mechanically or chemically, especially since barite has low solubility in water . Also, it has low solubility in common acids such as formic acid, lactic acid, citric acid, and hydrochloric acid (HCl). , Chelating agents are chemicals with many applications in different industries. − They were introduced as an efficient barite dissolver. , Different chelating agents were tested including DTPA, EDTA, HEDTA, DOCTA, NTA, and TTHA to dissolve barite (i.e., Table shows the full name of each chelating agent) . The DTPA was found to be one of the most efficient in dissolving the barite scale.…”

Section: Introductionmentioning

confidence: 99%

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Minimizing the Barite Scale in Carbonate Formations during the Filter Cake Removal Process

et al. 2022

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The barite scale is one of the most common scales in the oil and gas industry. It can form in the reservoir or precipitate in different production equipment. The formation of such a scale will significantly minimize the capillary diameter of the flow channels and consequently shrink the well productivity. On the other hand, the production of movable barite particles causes severe erosion for the installed equipment. There are several sources of the barite scale such as mixing of incompatible brines and solid invasion of the barite weighted during drilling. In addition, the barite scale could be produced during the interaction of the chelating agent solutions with the reservoir formation during the filter cake removal process (secondary damage). The main focus of this study is to prevent the barite scale inside the carbonate formations during filter cake removal. The capability of a solution consisting of both diethylenetriamine pentaacetic acid (DTPA) and ethylenediamine tetraacetic acid (EDTA) as a novel solution to prevent barite scale formation in carbonate formations after the removal of the barite filter cake was evaluated. A series of laboratory experiments were accomplished to characterize the barite scale and evaluate the performance of the proposed solution. In particular, particle size distribution, scanning electron microscopy, X-ray diffraction, core flooding, NMR spectroscopy, solubility test, and inductively coupled plasma (ICP) spectroscopy tests were conducted for this aim. The experiments were performed using carbonate core samples. The results showed that the proposed solution was able to load 35 000 ppm barium in the presence of calcite ions. The addition of EDTA tended to inhibit the barite deposition and improve the rate of the calcite reaction. NMR results showed that a mixture of DTPA and EDTA (20%) can stimulate the macropores, resulting in an increase in the return permeability by 1.4–1.8 times of the initial value, while the precipitation that occurred in the micropores could be ignored with respect to the overall porosity improvements.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Minimizing the Barite Scale in Carbonate Formations during the Filter Cake Removal Process

et al. 2022

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“…The choice of the reactive fluid strongly depends on the formation mineralogy and the subsurface pressure and temperature conditions. For example, in carbonate rocks, where the dominant minerals are calcite and dolomite, hydrochloric, emulsified, citric, acetic, and chelating acids are the typical solutions used in the treatment. − The initiation and propagation of the induced wormholes depend on many parameters, including the relative magnitude of the rate of acid transport to the rate of reaction, temperature, mineralogy, and porous medium properties at different length scales. − …”

Section: Introductionmentioning

confidence: 99%

“… 7 − 13 The initiation and propagation of the induced wormholes depend on many parameters, including the relative magnitude of the rate of acid transport to the rate of reaction, temperature, mineralogy, and porous medium properties at different length scales. 14 − 16 …”

Section: Introductionmentioning

confidence: 99%

Optimization and Uncertainty Quantification Method for Reservoir Stimulation through Carbonate Acidizing

2022

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Reservoir stimulation is a widely used technique in the oil and gas industry for increasing the productivity of hydrocarbon reservoirs, most notably in carbonate formations. This work aims to develop an optimization workflow under uncertainty for matrix acidizing. A reactive transport model is implemented in a finite-element framework to simulate the initiation and propagation of dissolution channels in porous carbonate rock. The model is verified using an analytical solution. We utilize surrogate modeling based on polynomial chaos expansion (PCE) and Sobol indices to identify the most significant parameters. We investigate the effect of varying 12 identified parameters on the efficiency of the stimulation process using dimensionless groups, including the Damkoḧler, Peclet, and acid capacity numbers. Furthermore, the surrogate model reproduces the physics-based results accurately, including the dissolution channels, the pore volume to breakthrough, and the effective permeability of the stimulated rock. The developed workflow assesses how uncertainties propagate to the model's response, where the surrogate model is used to calculate the univariate effect. The global sensitivity analysis shows that the acid capacity number is the most significant parameter for the pore volume to breakthrough with the highest Sobol index. The marginal effect calculated for the individual parameter confirms the results from Sobol indices. This work provides a systematic workflow for uncertainty analysis and optimization applied to the processes of rock stimulation. Characterizing the impact of uncertainty provides physical insights and a better understanding of the matrix acidizing process.

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Evaluation of carbonate rock acidizing under different reservoir conditions and damage scenarios: a systematic review

da Silva,

de Meneses Lourenço

et al. 2024

Carbonates Evaporites

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Carbonate Stimulation Using Chelating Agents: Improving the Treatment Performance by Optimizing the Fluid Properties

Cited by 9 publications

References 50 publications

Minimizing the Barite Scale in Carbonate Formations during the Filter Cake Removal Process

Minimizing the Barite Scale in Carbonate Formations during the Filter Cake Removal Process

Optimization and Uncertainty Quantification Method for Reservoir Stimulation through Carbonate Acidizing

Evaluation of carbonate rock acidizing under different reservoir conditions and damage scenarios: a systematic review

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