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Collaborating Authors
Kapadia, Gautam
Abstract Oil, water and gas separation at wellpads with improved technology and compact design has significant advantage for increasing liquid handling from group gathering wellpads and accelerating oil production from fields. Cairn, Oil & Gas vertical of Vedanta Limited is the Operator of RJ/ON block in India with major fields Mangala (M), Bhagyam (B) and Aishwariya (A). Mangala field (75% of MBA production) is the largest onshore oil discovery in India and Bhagyam-Aishwarya fields together contribute to ~25% of the total MBA production. The MBA fields are on water + polymer flood and gradual increase in water production is challenging to process the same oil production volumes. Future field development plans in these fields requires debottlenecking of liquid handling constraints. The current paper depicts the fast track modifications planned in various fields and its implementation carried out in Aishwariya field which was limited for produced fluid handling due to capacity constraints at the centralized processing well-pad 8 (AWP-08). These modifications were aimed towards localized produced water treatment and reinjection of 30,000 barrels per day (bpd) into the existing injection manifold at Aishwarya Wellpad. In the first stage, produced water is separated from 3,000 ppm to 300 ppm OIW and in second stage from 300 to <100 ppm OIW with <5 ppm TSS. The existing vessels were retrofitted and modified in field with internals like inlet device, calming baffles, coalescing pack, overflow weir and oil bucket. This enabled additional residence time suiting the given fluid characteristics and efficient separation of the produced fluids. This resulted in accelerating oil production from the field by ~2,000 bopd by opening more shut-in wells and leveraging terminal liquid handling capacity. And with the future ESP upsizing and more infill wells coming online, there is further potential to gain additional oil upto 3000 bopd. The execution of Project commenced in Sep-17 and was commissioned in Dec-17 in a record 3 months’ time period including engineering which helped in monetizing early oil production benefit. Based on the success of the local pad separation in Aishwariya field, similar scheme is planned to be implemented in Mangala & Bhagyam wellpads and other small fields with high water production.
- Energy > Oil & Gas > Upstream (1.00)
- Water & Waste Management > Water Management > Lifecycle > Treatment (0.68)
- Europe > Norway > North Sea > Northern North Sea > East Shetland Basin > PL 050 > Block 34/10 > Gullfaks Field > Statfjord Group (0.99)
- Europe > Norway > North Sea > Northern North Sea > East Shetland Basin > PL 050 > Block 34/10 > Gullfaks Field > Lunde Formation (0.99)
- Europe > Norway > North Sea > Northern North Sea > East Shetland Basin > PL 050 > Block 34/10 > Gullfaks Field > Lista Formation (0.99)
- (12 more...)
Abstract Polymer flood process has the potential to significantly improve sweep efficiency in the fields with viscous oil, due to unfavorable water-flood oil-water mobility ratio resulting in a relatively inefficient water-flood. A successful field implementation would lead to extended production plateau and increased ultimate recovery (EUR). Cairn India Ltd is engaged in Oil and Gas exploration and production in RJ-ON onshore block in India. Mangala oil field is the largest discovered field with significant oil production potential (Total estimated water flood recovery of around 37 %). The field which contains moderately viscous but waxy oil with high pour point is currently under hot water flood to provide pressure support, sweep and prevent any in-situ wax drop-out. Post success of a polymer pilot trial, the full field polymer flood project is being implemented in the field with the concept of a Central polymer preparation plant distributing the concentrated polymer mother solution to the injection wells which are scattered across the field. The mother solution is diluted with the injection water to required polymer concentration before final injection into the well. Full field Polymer Injection it is expected to yield additional recovery of 5–7% of the STOIIP over base water flood. This paper discusses the challenges faced during the execution of the polymer injection in the full scale with respect to, Supply chain management of polymer w.r.t framing the polymer supply contracts, screening of multiple vendors in different geographical location and the logistics management of large volumes of polymer, Laboratory techniques in screening the polymer, challenges faced in laboratory measurements including viscosity measurement in aerobic/anaerobic conditions, low shear high pressure sampling, and compatibility of oil field chemical additives with Polymer, Operational challenges including viscosity with available water quality & higher oil in water, TSS, Fe content and impact of temperature variation on viscosity of mother solution and diluted polymer solution, Produced fluid handling challenges with Polymer breakthrough with respect to adequacy of oil-water-gas treatment facility to handle emulsion, scaling/gelling issues in heat exchangers and the capacity limitations caused by viscosity and hydraulics. To summarize, for the full field polymer injection, the challenges discussed with respect to unwieldy logistics of polymer procurement, mother and dilute polymer solution preparation at low shear and high pressure environment followed by polymer breakthrough resulting in tighter emulsion, etc need to be addressed proactively in order to achieve the targeted recovery from the Project. The focused efforts on these areas of concern are the drives for the success of all the stakeholders.
- Asia > India > Rajasthan > Rajasthan Basin > Barmer Basin > Rajasthan Block > Mangala Field > Fatehgarh Formation (0.99)
- Asia > India > Rajasthan > Rajasthan Basin > Barmer Basin > Rajasthan Block > Mangala Field > Barmer Hill Formation (0.99)
- Asia > India > Rajasthan > Rajasthan Basin > Barmer Basin > Block RJ/ON-90/1 > Mangala Field > Fatehgarh Formation (0.99)
- Asia > India > Rajasthan > Rajasthan Basin > Barmer Basin > Block RJ/ON-90/1 > Mangala Field > Barmer Hill Formation (0.99)
Abstract With an average gross operated production of 211,671 boepd in FY2015, Cairn India Limited (CIL) is the largest private sector producer of crude oil in India. In FY 14-15, around 120 wells were drilled in Mangala, Bhagyam and Aishwariya alone. Waste water generation in Operations has seen a massive increase in recent years because of increased production and an aggressive drilling campaign. CIL operates on Zero Surface Effluent discharge philosophy making it imperative to deliberate on waste water disposal strategy. Managing the huge volumes of waste water in a sustainable manner is a challenge. Accordingly, waste water treatment plant for reuse and waste pits and guard ponds were created to evaporate waste water. Due to waxy nature of oil in waste water, high level of suspended solids and bacterial degradation, natural evaporation is almost negligible. Waste water accumulation over a long period of time has resulted in inventory buildup of all the pits. It has become business critical requiring strategic focus to ensure business continuity and sustainability. Given the challenges of waste water management in onshore Oil & Gas operations, the paper describes the various technologies available in the market and tested by Cairn, results of market studies carried including pros and cons of each option, followed by pilot-scale implementation of the chosen technologies. The paper not only describes the success of the pilot studies and the related technical aspects, but also the commercial, socio-economic and stakeholder challenges and the approach to applying the selected option for full-field implementation. The paper concludes with suggested way forward for full-field implementation including associated challenges and success factors. The objective of this paper is to share the experiences of an operating company with other oil & gas Companies worldwide on various aspects relating to waste water treatment and management in onshore oil & gas operations. The typical process for an Oil & Gas Operator is to evaluate all aspects, right from technology finalization to economic optimization and finally develop an integrated roadmap for the entire project. A firm methodology was adopted to validate the technical as well as the commercial aspects of the project. The final treated water is put for reuse thereby delivering twin benefits in terms of handling waste water in a sustainable manner as well as optimizing the water footprint.
- Water & Waste Management > Water Management > Water Supplies & Services (1.00)
- Water & Waste Management > Water Management > Lifecycle > Treatment (1.00)
- Energy > Oil & Gas > Upstream (1.00)