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Collaborating Authors
Abd-Rahman, A-Sukaimy
Breaking Barriers: Downhole H2S Scavenger Automation Pilot Trial Intellisweet
Abd-Rahman, A-Sukaimy (Brunei Shell Petroleum Co) | Turner, Michael (Brunei Shell Petroleum Co) | Kulkarni, Rahul (Brunei Shell Petroleum Co) | McGregor, Stuart (Shell UK Ltd) | Ajibode, Sulaimon (Baker Hughes) | Leidensdorf, Jeremy (Baker Hughes) | Pukall, Alejandro (Baker Hughes) | Othman, Abdullah (Baker Hughes)
Abstract Seawater Injection has been used in Offshore field as a means of pressure maintenance for improving oil recovery. Since there is no Sulphate removal and Nitrate injection from Day 1, H2S generation from Sulphate Reducing Bacteria (SRBs) has led to reservoir souring. This has led to a serious attention to manage the H2S production risks in terms of health, safety and environment (HSE). A new technology with real time H2S Scavenger and Automation was trialled in an offshore oil production platform. INTELLISWEET automated H2S chemical management system is an intelligent chemical injection system that enables autonomous and controlled H2S scavenger injection rates based on well and topside production conditions. Mixed production fluid samples are continuously collected from wellhead, passed through temperature/pressure conditioning, and through a series of sample conditioning and analysis to allow for accurate measurement of the total H2S in the produced fluid. The field trial was conducted in an offshore facility platform in a well with a downhole capillary string chemical injection in an Electrical Submersible Pump (ESP) well. Based on the field trial outcome, a reduction in the H2S ppm (as low as 4ppm) and the % removal efficiency of up to 98% was observed. The system package has proven to be effective in maintaining H2S levels below target while allowing 24h online remote monitoring and the ability to make changes remotely as well. This first of its kind digital automation system continuously captures data that shows chemical pump performance, amounts of H2S being produced and scavenged, amounts of H2S scavenger being injected, well production data, alerts of system anomalies, and various other information that gives total visibility of the chemical injection treatment program. With INTELLISWEET, a reliable cost-effective automated removal of total H2S in the oilfield can be achieved. It allows for minimized HSE risk of employees – less field exposure, unlocks access to high H2S well reserves, and gives remote access to monitor and control H2S chemical injection treatment programs with automated and optimized dosages.
Enhanced Solvent-Based Remediation of Waxy Deposits
Zadeh, Kamran Akbar (Shell International Exploration and Production Inc.) | Tatavalli-Mittadar, Nirmal (Shell International Exploration and Production Inc.) | Abd-Rahman, A-Sukaimy (Brunei Shell Petroleum Co) | Jain, Shekhar (Shell International Exploration and Production Inc.) | Ashtekar, Sunil (Shell International Exploration and Production Inc.) | McGregor, Stuart (Brunei Shell Petroleum Co) | Degaleesan, Sujatha (Shell International Exploration and Production Inc.)
Abstract Restriction or blockage of flow path due to waxy deposits is a global issue in the oil and gas production. This undesirable flow assurance issue leads to increase in production deferment and OPEX for mitigation and frequent intervention. It may also result in huge CAPEX for pipeline sections replacement due to untreatable blockages. Despite the current prevention and mitigation strategies in place, wax deposition cannot be fully eliminated. Existing remediation technologies can be broadly classified to mechanical, thermal, and chemical-based treatments. These also have some limitations such as availability, cost, deferment and effectiveness. Today, most effective solutions are often a combination of mechanical and chemical which are expensive in terms of cost and may result in additional deferment time. As such, the development of more effective remediation strategies is of great importance. Solvent-based cleaning can be relatively less expensive if it is a viable option. However, experience suggests that conventional solvents such as xylene are generally not that effective in dissolving and breaking wide range of waxy deposits with varying compositions. Enhanced solvent-based remediation is a novel approach with the focus to balance performance, cost, and safety for field applications. Based on this approach, understanding the field deposit, optimizing solvent's performance in the lab under representative field conditions, selecting a solvent that balances performance with cost and safety, scaling up from lab to the field conditions based on the field's limitations, and proper deployment of the selected solvent in the field play important roles in effective remediation of deposits. In this work, the enhanced solvent-based remediation approach and the lab procedure for primary screening of solvents are described. In addition, the procedure for cleaning a flowline that was restricted by wax deposit in an onshore field in South-East Asia is explained. The results of this successful field application that led to increase in net oil production and OPEX saving are also discussed.
- Materials > Chemicals > Commodity Chemicals > Petrochemicals (1.00)
- Energy > Oil & Gas > Upstream (1.00)