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• W4249802381 abstract "Modelling of Non-Aqueous and Aqueous Scale Inhibitor Squeeze Treatments Oscar Vazquez; Oscar Vazquez Heriot-Watt University Search for other works by this author on: This Site Google Scholar Eric James Mackay; Eric James Mackay Heriot-Watt University Search for other works by this author on: This Site Google Scholar Kenneth S. Sorbie Kenneth S. Sorbie Heriot-Watt University Search for other works by this author on: This Site Google Scholar Paper presented at the International Symposium on Oilfield Chemistry, Houston, Texas, U.S.A., February 2007. Paper Number: SPE-106422-MS https://doi.org/10.2118/106422-MS Published: February 28 2007 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Vazquez, Oscar, Mackay, Eric James, and Kenneth S. Sorbie. Modelling of Non-Aqueous and Aqueous Scale Inhibitor Squeeze Treatments. Paper presented at the International Symposium on Oilfield Chemistry, Houston, Texas, U.S.A., February 2007. doi: https://doi.org/10.2118/106422-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search nav search search input Search input auto suggest search filter All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE International Conference on Oilfield Chemistry Search Advanced Search 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 multi-phase reservoir simulation calculations5. An example two-phase calculation of a specific field treatment is included, and the results are compared with the field return profiles.IntroductionThe precipitation of inorganic minerals, such as the carbonate and sulphate scales, presents a significant flow assurance challenge to the oil and gas industry. For example, BP estimated that during the period 1999–2003, 18% of their well downtime in the North Sea was attributable to scale. Although the severity of the scaling tendency and the challenges of managing scale vary from field to field, oilfield scale is found in all oil producing regions of the world.The most common method for preventing scale formation is by applying scale inhibitor chemicals. These may be applied as a one-off treatment when the well is completed, continuously by some chemical injection system, or in batch treatments usually referred to as scale inhibitor squeeze treatments. In the squeeze process, the scale inhibitor solution is injected down a producer well into the near wellbore formation, where the inhibitor is retained on the rock surfaces, and from where it is gradually released and flows into the well during production, providing the required protection. Commonly, these scale inhibitor treatments are injected as aqueous solutions but there are situations where an aqueous based treatment is not desirable, e.g. where water blocking, fluid lifting, or hydrate formation are a concern.The main purpose of this paper is to present results of a modelling study that compares non-aqueous and aqueous scale inhibitor squeeze treatments. The model used is called SQUEEZE VI and it has been developed over many years at Heriot-Watt University1–5. 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. Then a series of sensitivity calculations is performed to demonstrate the impact of various parameters, some of which are determined by nature, and some of which may be controlled by the operator implementing the squeeze treatment.The main parameters of interest are highlighted in the conclusions, with special reference being made to one of the principal findings of this work, that the solubility of the scale inhibitor in the overflush fluid significantly affects the treatment efficiency.Sensitivity studyThe main purpose of this paper is to carry out a sensitivity study of non-aqueous versus aqueous scale inhibitor squeeze treatments, using the two-phase squeeze treatment simulator to model the effect on the treatment life of the formation characteristics and different treatment strategies. First, we will define the base case model parameters and then present the results of the various sensitivity calculations. Keywords: wax remediation, water management, oilfield chemistry, scale inhibition, wax inhibition, asphaltene remediation, scale remediation, Production Chemistry, Upstream Oil & Gas, paraffin remediation Subjects: Production Chemistry, Metallurgy and Biology, Inhibition and remediation of hydrates, scale, paraffin / wax and asphaltene This content is only available via PDF. 2007. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4249802381 title "Modelling of Nonaqueous and Aqueous Scale-Inhibitor Squeeze Treatments" @default.
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