Qualification Procedure For Continuous Injection Of Chemicals In The Well -Method Development

Goodwin, Neil; Svela, Odd Geir; Olsen, John Helge; Hustad, Britt Marie; Tjomsland, Tore; Graham, Gordon Michael

doi:10.2118/154934-ms

Cited by 14 publications

(4 citation statements)

References 4 publications

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“…The corrosivity of the chemicals was assessed in neat form and as a vacuum residue. 18 The viscosity limit of the final product was defined as 100 cP for all temperature, shear, and pressure conditions, 19 which could occur in the chemical delivery system. Product stability is paramount; thus, no formation of solids, gelation events, or phase separation was tolerated in the stability evaluation.…”

Section: ■ Chemical Treatment For Flow Assurancementioning

confidence: 99%

“…Chemical compatibility of the candidate products was tested using swelling tests with all elastomers and rubbers installed in the facilities. The corrosivity of the chemicals was assessed in neat form and as a vacuum residue . The viscosity limit of the final product was defined as 100 cP for all temperature, shear, and pressure conditions, which could occur in the chemical delivery system.…”

Section: Selection Of the Wax/asphaltene Treatment Chemicalmentioning

confidence: 99%

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Enhanced Evaluation of Asphaltene-Related Oil Properties To Facilitate Production in a Complex Offshore Environment

Krueckert

Seibold²

2018

Energy Fuels

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Asphaltene destabilization is a widespread problem in the oil industry. Under initial pressure and temperature conditions in the oil reservoir, asphaltenes are stabilized by building micelle structures in which they are associated with resin and aromatic compounds. Stable asphaltenes do not pose problems during oil production; however, if pressure/temperature conditions change throughout the production system, asphaltenes might become destabilized. Once destabilized, asphaltenes can potentially impair the whole production system. The development and implementation of a profound chemical injection strategy to mitigate asphaltene-related problems are paramount for a successful and sustainable fluid production if routine operating conditions are within the asphaltene instability range. A preventive asphaltene mitigation strategy is generally preferred; i.e., it is beneficial to avoid the occurrence of asphaltene-related problems in the first instance, instead of applying any remediation method afterward. Boundary conditions defined by the oil characteristics and the actual production conditions can make the development of a completely preventive chemical treatment strategy challenging. This applies especially in the offshore sector of the industry with given limitations in accessibility to the production and storage facilities accompanied by stringent regulatory requirements. This paper describes the analysis of a crude oil produced in a complex offshore environment, including mixing with condensate and storage in a gravity-based subsea tank. It highlights the asphaltene-related characteristics and compares different technologies to assess stability of the oil in neat form and upon mixing with condensate. The impact of different asphaltene inhibitors/dispersants on the oil has been investigated, and additionally, the effectiveness of dissolver chemicals on artificially sedimented asphaltene deposits has been evaluated. Different lab experiments have been conducted to determine the asphaltene concentration in the fluid and sediment layer over time with the aim to quantify the sedimentation. Computational fluid dynamics (CFD) was used to simulate potential sedimentation phenomena. This paper is based on a presentation given at the 19th International Conference on Petroleum Phase Behavior and Fouling (Petrophase 2018) in Park City, UT, U.S.A. Names of the platforms, distinct locations, and actual production numbers are not revealed in the paper with respect to information protection requirements of the parties involved.

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Section: ■ Chemical Treatment For Flow Assurancementioning

confidence: 99%

Section: Selection Of the Wax/asphaltene Treatment Chemicalmentioning

confidence: 99%

Enhanced Evaluation of Asphaltene-Related Oil Properties To Facilitate Production in a Complex Offshore Environment

Krueckert

Seibold²

2018

Energy Fuels

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“…The formation of vapour or partial vacuum pockets within the chemical injection systems, due to hydrostatic pressure fluctuations and valve functions within the system, has also been noted [1,3]. Such low-pressure pockets formed within chemical injection systems may cause some components to be stripped from the injected chemicals, and there is a risk that different material compatibility/corrosivity mechanisms apply for the condensed vapours or stripped residues of the production chemicals when compared to the originally applied product.…”

Section: Introductionmentioning

confidence: 99%

“…A simple laboratory method to obtain condensed vapours and residues of scale inhibitors and to compare their pH with the 'assupplied' chemicals has previously been described [3]. This method involved a distillation of the chemical at atmospheric pressure until 25 % of the volume had been distilled and collected as the condensed vapours, leaving 75% as a residue.…”

Section: Introductionmentioning

confidence: 99%

Quantifying Increased Corrosion Risks in Chemical Injection Lines and Gas Lift Systems Due to Partial Evaporation Effects

Bowering¹,

Goodwin²,

McCall³

et al. 2013

SPE International Symposium on Oilfield Chemistry

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The application of production chemicals downhole via dedicated injection lines or by means of gas lift systems, whilst not new, is becoming more commonplace in the oil and gas industry. The corrosion characteristics of injected chemical formulations in such systems can be complex and require detailed testing to understand the behaviour and assess the potential corrosion risk of chemical formulations under the extreme conditions of temperature and pressure that exist within either of these injection systems.In the presence of a fast flowing stream of hot gas, the more volatile components can be stripped from the formulated product, resulting in separate condensed vapours and chemical residues. Similarly, low-pressure vapour pockets formed within downhole chemical injection systems due to hydrostatic pressure fluctuations may cause some components of the injected chemical to be evaporated. Materials compatibility tests are commonly conducted using samples of "as supplied" production chemicals However, there is also a risk that different material compatibility/corrosivity characteristics can be induced by the condensed vapours or stripped residues of the production chemicals when compared to the originally applied chemical formulation. Laboratory testing is not commonly conducted to assess this behaviour.Samples have been prepared and corrosion tests conducted on collected vapours and residues from production chemicals. Distillations were conducted on the neat chemicals to obtain vapours and residues, and corrosion rates were measured on a range of different metallic specimens by conventional electrochemical or coupon weight loss methods. The results of these separated phase corrosion tests were then compared with the corrosion measurements on the original formulations.The test programme demonstrated that for some of the formulations tested, significantly higher corrosion rates were measured for either the condensed vapours or the distillation residues when compared to the original formulation.This work highlights the need to carefully consider the possible range of temperature/pressure conditions and gas/liquid phase interactions that will be experienced by injected chemicals within the chemical delivery system. Specifically, there is a need to assess the implications of solvent stripping/evaporation of volatile components. Chemicals that form more corrosive condensed vapours or residues may need to be avoided to prevent equipment failure or a loss of integrity. It is not adequate to simply test the 'stability' of a chemical at elevated temperatures, ambient pressure and static conditions; the separation effects within the gas/liquid system must also be considered.

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Evaluation of aging of chemical additives under controlled conditions of pressure, flow rate and temperature

Silva,

Domingos da Silva,

de Gusmão Celestino

et al. 2024

Petroleum Science and Technology

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Qualification Procedure For Continuous Injection Of Chemicals In The Well -Method Development

Cited by 14 publications

References 4 publications

Enhanced Evaluation of Asphaltene-Related Oil Properties To Facilitate Production in a Complex Offshore Environment

Enhanced Evaluation of Asphaltene-Related Oil Properties To Facilitate Production in a Complex Offshore Environment

Quantifying Increased Corrosion Risks in Chemical Injection Lines and Gas Lift Systems Due to Partial Evaporation Effects

Evaluation of aging of chemical additives under controlled conditions of pressure, flow rate and temperature

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