The Modelling of Adsorption and Precipitation Scale Inhibitor Squeeze Treatments in North Sea Fields

Yuan, Ming; Sorbie, K.S.; Todd, A.C.; Atkinson, L.M.; Riley, Helen; Gurden, Stuart

doi:10.2523/25163-ms

Cited by 20 publications

(18 citation statements)

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“…Conventional adsorption and precipitation scale inhibitor squeeze treatments have been modelled in the field for many years (Meyers, et al, 1985;Hong and Shuler, 1988;Sorbie et al, 1991Sorbie et al, , 19921994;Yuan et al, 1993;Malandrino et al, 1995) and more recently quite generalized types of coupled adsorption/precipitation squeeze processes can be modelled (Sorbie, 2010;Vazquez et al, 2010). In this work, two generic scale inhibitor squeeze reservoir/near-well models were developed to study the impact of flow distribution around the wellbore.…”

Section: Simulation Of Scale Inhibitor Squeeze Treatmentsmentioning

confidence: 99%

Impact of Fluid Distribution on Scale Inhibitor Squeeze Treatments in Pattern Floods and Fractured Wells

Rakhimov¹,

Vazquez²,

Mackay³

2010

SPE EUROPEC/EAGE Annual Conference and Exhibition

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The most common method for preventing scale formation in the well completions is by applying a scale inhibitor (SI) squeeze treatment. Near-well squeeze treatment models generally assume that the flow pattern around the well is radial. Although, this assumption may be reasonable in most scenarios, this paper investigates whether strictly non-radial flow patterns around the well have a major effect on the squeeze treatment.Sensitivity calculations were performed to identify the impact of waterflood patterns such as Two-Spot, Five-Spot, Line Drive, etc. on the squeeze treatment lifetime in vertical production wells. The second part of the project then continued the study of the impact of flow patterns in fractured vertical production wells. The outcome is that scale squeeze treatments initiated at the same watercut appear not to be impacted by the various flood patterns studied. However, investigation showed that fractured wells typically have longer squeeze lifetimes in comparison to non-fractured wells.Calculations show that for fractured wells, inhibitor adsorption on the face of the fracture itself has no impact on the treatment lifetime; the longevity of the squeeze is determined by the inhibitor adsorption in the matrix rock outside the fracture. The benefit a fracture brings is in terms of propagating the SI further from the well than would occur in an unfractured radial treatment. In the fractured well the inhibitor is then more greatly retarded by contact with rock over a greater distance than would occur in a matrix only radial treatment. Sensitivity calculations were performed to identify the impact of fracture length.

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Section: Simulation Of Scale Inhibitor Squeeze Treatmentsmentioning

confidence: 99%

Impact of Fluid Distribution on Scale Inhibitor Squeeze Treatments in Pattern Floods and Fractured Wells

Rakhimov¹,

Vazquez²,

Mackay³

2010

SPE EUROPEC/EAGE Annual Conference and Exhibition

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“…Most mineral scales are best treated by preventive measures. The most common practice in oilfields is to carry out a scale inhibitor (SI) squeeze treatment [1][2][3][4][5][6][7][8] in which a slug of inhibitor chemical is injected into the producer well followed by an overflush with injection water and a brief shut-in period. The success of such a squeeze treatment will depend on the inhibitor return once the oil production recommences after the shut-in.…”

Section: Introductionmentioning

confidence: 99%

“…Two types of squeeze treatment are commonly used in the oil industry, (i) adsorption/desorption squeezes [1][2][3][4][5][6][7][8] , and (ii) precipitation squeezes 6,9 . These processes are discussed in the following section.…”

Section: Introductionmentioning

confidence: 99%

Coupled Adsorption/Precipitation Of Scale Inhibitors: Experimental Results And Modelling

2008

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In this paper, results are presented on the general mechanisms by which scale inhibitors (SIs) are retained within porous media. There is a generally accepted view that the main two mechanisms of SI retention are "adsorption" and "precipitation" and these are described by different but related modelling approaches in the literature. These approaches have been used quite successfully to model field squeeze treatments. To analyse in a detailed and unambiguous manner where a given retention mechanism (e.g. pure adsorption) or mechanisms (e.g. coupled adsorption and precipitation) are operating requires that we carry out careful laboratory experiments under "field relevant" conditions.In this work, we study adsorption vs. adsorption/ precipitation by performing a series of experiments where we know that the system exhibits either (a) adsorption only or (b) coupled adsorption/precipitation. Experimentally it is straightforward to determine which regime the system is in, as explained below. We present the theory describing the coupled adsorption/precipitation process. In addition, an extensive series of experimental adsorption/precipitation measurements are presented for various mineral separates including sand, chlorite, siderite, muscovite, kaolinite, feldspar and montmorillonite. The coupled adsorption/ precipitation model is in very good agreement with experiment.

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“…The model used is called SQUEEZE VI and it has been developed over many years at Heriot-Watt University [1][2][3][4][5] . First of all the model is used to simulate a squeeze treatment in a given well, demonstrating the ability of the model to match the observed data.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Non-Aqueous and Aqueous Scale Inhibitor Squeeze Treatments

Vazquez¹,

Mackay²

2007

All Days

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fax 01-972-952-9435. AbstractThe most common method for preventing downhole scale formation is by applying a scale inhibitor squeeze treatment. In this process, a scale inhibitor solution is injected down a producer well into the near wellbore formation. Commonly, these scale inhibitor treatments are injected as aqueous solutions. However, there are certain situations where an aqueous based treatment is not desirable, such as where relative permeability effects, water blocking, fluid lifting, chemical penetration or hydrate formation are of major concern.This paper presents the results of a modelling sensitivity study comparing non-aqueous and aqueous scale inhibitor squeeze treatments. The model described can simulate the effect on the treatment life of treatment solubility in the oil and water phases, treatment strategy, adsorption properties (from the water and oleic phases), viscosity effects and wellbore friction. Of particular interest is the relationship between inhibitor solubility in the carrier and in situ phases, and the choice of phase for the overflush fluid. The relationship can have a very pronounced impact on inhibitor penetration and squeeze lifetimes.The sensitivity study is carried out using purpose written software for scale treatments. The code is a two-phase flow, multi-component, multi-layer, radial or linear mathematical model capable of simulating both aqueous and non-aqueous squeeze treatments. The model considers the immiscible displacement of oil and water phases along with inhibitor transport in both phases and mass transfer between phases. It is capable of modelling kinetic and equilibrium adsorption and desorption from either phase. The model has been validated by comparison with analytical solutions, standard conventional single-phase squeeze calculations and multiphase reservoir simulation calculations 5 . An example twophase calculation of a specific field treatment is included, and the results are compared with the field return profiles.

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The Modelling of Adsorption and Precipitation Scale Inhibitor Squeeze Treatments in North Sea Fields

Cited by 20 publications

References 0 publications

Impact of Fluid Distribution on Scale Inhibitor Squeeze Treatments in Pattern Floods and Fractured Wells

Impact of Fluid Distribution on Scale Inhibitor Squeeze Treatments in Pattern Floods and Fractured Wells

Coupled Adsorption/Precipitation Of Scale Inhibitors: Experimental Results And Modelling

Modelling of Non-Aqueous and Aqueous Scale Inhibitor Squeeze Treatments

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