Acid Stimulation Improvement with the Use of New Particulate Base Diverter to Improve Zonal Coverage in HPHT Carbonate Reservoirs

Moid, Farrukh; Rodoplu, Rasim Serdar; Nutaifi, Abdulrahman M.; Kayumov, Rifat

doi:10.2523/iptc-20154-ms

Cited by 11 publications

(2 citation statements)

References 4 publications

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“…Different kinds of retarded acids have been used in matrix acidizing operations to enlarge the treated zone of near wellbore area so far. Some of famous retarded acid types are: Emulsified Acid, Gelled acid, Hybrid Acid system, Organic acid, Chemically Retarded Acid & GLDAs (Moid et al 2020;Li et al 2008;Shuchart et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Stimulation of Low Pressure Carbonates Reservoirs with a Triphase Emulsified Acid System "3PEA" of Southern Iran -Case Studies

2023

Improv Oil Gas Recover

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Matrix acidizing tries to enhance oil wells productivity as one of the main kind of well stimulation techniques in petroleum industry. This method of acidization is being implemented by stepwise injection of high rate stimulation fluids through the wellhead into the target zone of reservoir rock.Acid penetration depth and consequently the treated radius are the key factors to reach the maximum effectiveness of stimulation operations on production improvement and it can be optimized by an exact design of: fluid type, stimulation fluid volume, job stages and operating pressure.Based on recorded data and job reports, recent conventional matrix acidizing jobs had low effect on improving oil production rate in some old Iranian oil fields, especially depleted with low reservoir pressure ones. Firstly a possible reason of this problem was assessed as shallow acid penetration radius and insufficient treated area around the wellbore and well testing data confirmed this probability. Depth of damaged zone and acid penetration directly related on the porosity type, permeability, lithology, injection rate and production history of matrix acidizing candidate wells.In this study, successful application of a new kind emulsified acid system is evaluated in a low pressure, carbonates reservoirs in south of Iran. Application of nitrogen in stimulation treatments has gained wide acceptances in recent years. The applied triphase emulsified acid increases stimulated radius of near wellbore area by retardation the reactivity of acid system by adding a gaseous phase to emulsion of HCl and gasoil. Use of this acid system made it possible to achieve a 137% greater well productivity than traditional systems, in this study.

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Section: Introductionmentioning

confidence: 99%

Stimulation of Low Pressure Carbonates Reservoirs with a Triphase Emulsified Acid System "3PEA" of Southern Iran -Case Studies

2023

Improv Oil Gas Recover

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“…Hydrochloric acid treatment (HAT) is one of the most common methods of oil production stimulation for carbonate rocks, as of today [2][3][4][5][6]. The high effectiveness of acid treatment results from the growth of field indicators following the geotechnical procedures.…”

Section: Introductionmentioning

confidence: 99%

Influence of Geological and Technological Parameters on Effectiveness of Hydrochloric Acid Treatment of Carbonate Reservoirs

Krivoshchekov

Vyatkin

Ravelev

et al. 2020

IJE

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Hydrochloric acid treatment is the most common oil production stimulation treatment to date. Yet, most of operations fail to deliver the targeted results. For a more competent design of acid treatment of carbonate reservoirs, flow studies on core samples are conducted preliminary to determine the most effective acid composition and the technology of its injection into formation. The authors believe that, at present, processing of flow research results is incorrect, as not all parameters are taken into account when making recommendations. This study examined the influence of geological and technological parameters on effectiveness of hydrochloric acid treatment. In the course of studies using the flow unit and X-ray tomography, a number of factors have been identified that affect the outcome of the treatment. The volume of acid composition required to create a highly conductive channel in a core sample is a parameter using which it is possible to conduct a comparative analysis of effectiveness of the acid compositions under test and the methods of their injection. Therefore, exactly this parameter is used as a core in this paper, based on which the authors have derived an integrated indicator that provides for the most reliable evaluation of the flow study results. Using this indicator, it is possible to provide more competent recommendations as to the choice of acid compositions and the technology of oilfield hydrochloric acid treatments, which will provide the greatest effect of the planned operations to enhance oil recovery.

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Using Advance Acid Fracturing Design to Increase the Production Efficiency in a HPHT Reservoir: A Success Story from Southern Mexico

Figueroa¹,

Mejías²,

Frías³

et al. 2021

Day 4 Thu, November 18, 2021

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Enhanced hydrocarbon production in a high-pressure/high-temperature (HP/HT) carbonate reservoir, involves generating highly conductive channels using efficient diversion techniques and custom-designed acid-based fluid systems. Advanced stimulation design includes injection of different reactive fluids, which involves challenges associated with controlling fluid leak-off, implementing optimal diversion techniques, controlling acid reaction rates to withstand high-temperature conditions, and designing appropriate pumping schedules to increase well productivity and sustainability of its production through efficient acid etching and uniform fluid distribution in the pay zone. Laboratory tests such as rock mineralogy, acid etching on core samples and solubility tests on formation cuttings were performed to confirm rock dissolving capability, and to identify stimulation fluids that could generate optimal fracture lengths and maximus etching in the zone of interest while corrosion test was run to ensure corrosion control at HT conditions. After analyzing laboratory tests results, acid fluid systems were selected together with a self-crosslinking acid system for its diversion properties. In addition, customized pumping schedule was constructed using acid fracturing and diverting simulators and based on optimal conductivity/productivity results fluid stages number and sequence, flow rates and acid volumes were selected. The engineered acid treatment generated a network of conductive fractures that resulted in a significant improvement over initial production rate. Diverting agent efficiency was observed during pumping treatment by a 1,300 psi increase in surface pressures when the diverting agent entered the formation. Oil production increased from 648.7 to 3105.89 BPD, and gas production increased from 4.9 to 26.92 MMSCFD. This success results demonstrates that engineering design coupled with laboratory tailor fluids designs, integrated with a flawless execution, are the key to a successful stimulation. This paper describes the details of acidizing technique, treatment design and lessons learned during execution and results.

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Acid Stimulation Improvement with the Use of New Particulate Base Diverter to Improve Zonal Coverage in HPHT Carbonate Reservoirs

Cited by 11 publications

References 4 publications

Stimulation of Low Pressure Carbonates Reservoirs with a Triphase Emulsified Acid System "3PEA" of Southern Iran -Case Studies

Stimulation of Low Pressure Carbonates Reservoirs with a Triphase Emulsified Acid System "3PEA" of Southern Iran -Case Studies

Influence of Geological and Technological Parameters on Effectiveness of Hydrochloric Acid Treatment of Carbonate Reservoirs

Using Advance Acid Fracturing Design to Increase the Production Efficiency in a HPHT Reservoir: A Success Story from Southern Mexico

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