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51316-7115-Risk Assessment And Downhole Chemical Treatment Program For Production Wells Within The Wafra Field

Picture for Risk Assessment And Downhole Chemical Treatment Program For Production Wells Within The Wafra Field
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Chemical treatment of reservoir fluids within the wellbore is essential for the control of associated corrosion and scale deposition. The Wafra Risk Assessment was developed with the Likelihood of Failure (LoF) based on historical corrosion well workover failures and the Consequence of Failure (CoF) directly tied to oil daily oil production.

Product Number: 51316-7115-SG
ISBN: 7115 2016 CP
Author: Tariq Kamshad
Publication Date: 2016
Industries: Chemical Inhibitors , Oil and Gas Production
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$20.00
$20.00

The chemical treatment of reservoir fluids within the wellbore is essential for the control of associated corrosion and scale deposition issues that adversely affect the integrity of the downhole pumping systems as well as casings and production tubing strings. Scale deposition and/or corrosion within downhole pumps and production tubing strings can lead to major losses in production and costly workovers which adversely affects operational economics. Therefore immediate attention was required for the development of a practical field based risk assessment protocol for the design and application of the appropriate chemical treatment and monitoring programs to achieve mitigation of inherent scaling and corrosion issues.Joint Operation’s wafra field producing wells tubing/casing materials made of L-80 carbon steel. Due to the aggressive nature of the high H2S and carbonate salinity brine the workover rate on downhole pump and tubing failures were too frequent. The Wafra risk assessment was developed with the likelihood of failure (LoF) based on historical corrosion/scale well workover failures and the consequence (CoF) of failure directly tied to oil daily oil production. Therefore selection of the higher risk wells (Risk = LoF x CoF) became a direct relationship between the wells with the higher workover failure rates (associated with corrosion and scaling issues) and higher oil producing wells.Further selection and baseline monitoring considerations were also given to dissolved Iron & Manganese concentrations within the individual production well water samples utilizing the COPRA corrosion modelling techniques for sour brines. Chemical treatment and monitoring programs were then designed with consideration given to downhole pumping systems (SRP PCP and ESP) vs. effective chemical treatment and delivery system economics. Selection and design of chemical programs included a step-wise implementation to ensure the effective level of treatment was being accomplished for ensuring the dependability and integrity of the wells as well as the downstream gathering system and facilities.

Key words: Downloadable, Risk Assessment, Corrosion, Scale, Workover, Failures, Production, CoF, LoF

The chemical treatment of reservoir fluids within the wellbore is essential for the control of associated corrosion and scale deposition issues that adversely affect the integrity of the downhole pumping systems as well as casings and production tubing strings. Scale deposition and/or corrosion within downhole pumps and production tubing strings can lead to major losses in production and costly workovers which adversely affects operational economics. Therefore immediate attention was required for the development of a practical field based risk assessment protocol for the design and application of the appropriate chemical treatment and monitoring programs to achieve mitigation of inherent scaling and corrosion issues.Joint Operation’s wafra field producing wells tubing/casing materials made of L-80 carbon steel. Due to the aggressive nature of the high H2S and carbonate salinity brine the workover rate on downhole pump and tubing failures were too frequent. The Wafra risk assessment was developed with the likelihood of failure (LoF) based on historical corrosion/scale well workover failures and the consequence (CoF) of failure directly tied to oil daily oil production. Therefore selection of the higher risk wells (Risk = LoF x CoF) became a direct relationship between the wells with the higher workover failure rates (associated with corrosion and scaling issues) and higher oil producing wells.Further selection and baseline monitoring considerations were also given to dissolved Iron & Manganese concentrations within the individual production well water samples utilizing the COPRA corrosion modelling techniques for sour brines. Chemical treatment and monitoring programs were then designed with consideration given to downhole pumping systems (SRP PCP and ESP) vs. effective chemical treatment and delivery system economics. Selection and design of chemical programs included a step-wise implementation to ensure the effective level of treatment was being accomplished for ensuring the dependability and integrity of the wells as well as the downstream gathering system and facilities.

Key words: Downloadable, Risk Assessment, Corrosion, Scale, Workover, Failures, Production, CoF, LoF

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Multiple leaks occurred with a carbon steel pipe carrying hot condensate water (300F and 140 psi).  A root cause analysis was performed, including visual and metallographic examination of two failed samples chemical, analysis of weld metal and base metal and chemical analysis of water samples.  Results show that flow accelerated corrosion (FAC) was the responsible mechanism leading to the failures.
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