The Optimisation of a Scale Management and Monitoring Program for During the Production-Decline Phase of the Life Cycle

Jordan, Myles Martin; Strachan, Alistair; Johnston, Clare; Archibald, Ian; Farell, Rod

doi:10.2118/106133-ms

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DOI: 10.2118/106133-ms

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The Optimisation of a Scale Management and Monitoring Program for During the Production-Decline Phase of the Life Cycle

Myles Martin Jordan

Alistair Strachan

Clare Johnston³

et al.

Abstract: TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThis paper presents field results from scale squeeze

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Cited by 2 publications

References 24 publications

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Aspects of Scale Deposition in a Compositional Coupled Wellbore/Reservoir Simulator

Abouie

Korrani²,

Sepehrnoori

2017

Day 1 Mon, April 03, 2017

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Scale deposition in surface and subsurface production equipment is one of the major operational problems encountered during oil production, which results in equipment corrosion, wellbore plugging, production rate decline, and requires frequent squeeze treatments. Oil field scales mainly result from changes in the physicochemical properties (pH, temperature, and pressure), mixing with incompatible brine compositions, and mixing with inhibitors. Meanwhile, comprehensive modeling and prediction of scale formation has remained challenging due to the complexity of the geochemical reactions that occurs in real fields. For the first time and to overcome the lack of comprehensive geochemical-based tools, a robust, accurate, and flexible coupled reservoir and wellbore model is developed, and then, integrated with a geochemical tool (i.e. IPhreeqc) to predict scale formation from injection wells through the reservoir to production wells. IPhreeqc, the United States Geological Survey (USGS) geochemical tool, has the capability of modeling homogenous and heterogeneous, reversible and irreversible, and ion-exchange reactions under non-isothermal, non-isobaric, and local equilibrium or kinetic conditions. In this work, by integrating IPhreeqc with the compositional reservoir (UTCOMP) and wellbore simulator (UTWELL), the geochemical capabilities of IPhreeqc is used in a multi-physics reservoir/wellbore models for comprehensive prediction of carbonates and sulfates scales deposition. Moreover, the effects of weak acids and hydrocarbon phase dissolution in the aqueous phase were included to accurately predict the carbonate scale profile. To the best of our knowledge, there is no comprehensive simulator available in the industry through which scale deposition in the reservoir and wellbore can be predicted accurately. In this paper, scale deposition profile in the field is estimated by including 1) the interaction of the hydrocarbon and aqueous phases and its effect on the aqueous-scale geochemistry 2) effects of parameters that vary greatly in the field (i.e. pressure, temperature, and pH) and 3) comprehensive geochemistry simulation (provided through coupling of the simulators with IPhreeqc). The outcome of this study yields a comprehensive tool for prediction of scale deposition profile and will help scale deposition risk management and mitigation plans.

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Aspects of Scale Deposition in a Compositional Coupled Wellbore/Reservoir Simulator

Abouie

Korrani²,

Sepehrnoori

2017

Day 1 Mon, April 03, 2017

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Synergistic Scale Inhibitor Blends Provide Enhanced Carbonate Scale Management- Laboratory to Field

Jordan¹,

Vikshåland²,

Johnston³

2023

Day 2 Thu, June 29, 2023

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Control of inorganic sulphate and carbonate scales with polymer, phosphonate and phosphate ester scale inhibitors is well established within the oilfield service industry. Less well understood is the potential for synergistic interactions with blends of polymers/phosphonates/phosphate esters to give reduced treatment rates, lower chemical discharge volumes and potentially lower treatment cost specifically for carbonate scale control. In this paper selection and field trial application of such a synergistic blend is presented to control severe scaling within produced fluid heaters on a North Sea platform. Dynamic scale loop (DSL) tests were carried out to evaluate inhibition of a range of single component inhibitors before blends of these chemicals including biopolymer/phosphonate and carboxylic acid functionalized polymer/phosphonate were evaluated to try to reduce the inhibitor concentration required to control both calcium carbonate (saturation ratio, SR 550, mass 1100mg/l) and barium sulphate (SR 55, mass 450mg/l) scale formation. For this challenging carbonate (milder sulphate) scale environment at high temperature (105°C), it was observed that a blend of a polymer (carboxylic acid functionalized polymer) and currently applied low molecular weight phosphonate was more effective than either of the components by themselves, suggesting synergistic interaction. Results from the initial field trial of the synergistic blend are presented with monitoring methods outlined to confirm that the formulation is as effective as the laboratory evaluated tests suggested. The initial trial started at the incumbent products injection rate for 1 week with differential pressure across the production and test heaters carefully trended (along with fluid flow rate and fluid heating performance) to confirm scale control prior to a 20% reduction in treatment rate being applied for 1 week with a further reduction of 40% of the incumbent being applied for another 7 days prior to the incumbent chemical being reinstated to allow review of the trial formulations performance. Along with differential pressure trending scaling ions, suspended solids assessment via environmental scanning electron microscope (ESEM) and measurement of inhibitor concentration within the produced water was carried out to ensure scale control was effective. The current regulatory challenges with REACH (registration, evaluation, authorization and restriction of chemicals) mean that the methods outlined in this study offer the potential to reduce chemical treatment rate, cost and environmental impact by evaluating the synergistic interaction of the current range of commercially available environmentally suitable scale inhibitors and therefore eliminating the very high registration costs/ time delays to the market associated with new inhibitor molecule development.

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The Optimisation of a Scale Management and Monitoring Program for During the Production-Decline Phase of the Life Cycle

Abstract: TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThis paper presents field results from scale squeeze

Cited by 2 publications

References 24 publications

Aspects of Scale Deposition in a Compositional Coupled Wellbore/Reservoir Simulator

Aspects of Scale Deposition in a Compositional Coupled Wellbore/Reservoir Simulator

Synergistic Scale Inhibitor Blends Provide Enhanced Carbonate Scale Management- Laboratory to Field

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