New Approach for Completion Applications With Higher Internal Phase Inverts Utilizing Innovative Surfactants

Luyster, Mark; Patel, Anjali; Ravitz, Ray; Lim, Kim Sooi

doi:10.2118/144131-ms

Cited by 7 publications

(2 citation statements)

References 31 publications

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“…horizontal lateral in the Ekofisk and Tor chalk reservoirs would be performed using an 11 ppg oilbased ("oil-based" indicates inverted phase) emulsion containing 60 lbs/bbl calcium carbonate. This system is unique in that it lays down an oil-wet calcium carbonate filter cake, but can be converted to a water-wet filter cake once acid is applied and the pH is lowered (Lim et al 2011). The water-wet filter cake, consisting almost entirely of calcium carbonate, can be dissolved with HCl acid allowing for effective stimulation of the entire completion length.…”

Section: Design Features Of the Un-cemented Liner Completionmentioning

confidence: 99%

“…Although the chalk is highly acid soluble, there were concerns that the oil based mud (OBM) occupying the annulus and the OBM filter cake on the borehole wall could impede acid/chalk contact stimulation treatment. To minimize the potential of the OBM impeding the access of the acid to the chalk reservoir, an acid-reversible OBM (Lim et al 2011) was used to drill the reservoir section. This oil-external mud system was designed to be reversed to a water-external state on contact with acid to allow ready access of the acid treatment stage to the filter cake and chalk reservoir.…”

Section: Equipment Testing and Modelingmentioning

confidence: 99%

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Intelligent Completions and Un-Cemented Liners Combine to Provide a Fully Completed Solution with Zonal Isolation in Norway

Kent

Burkhead

Burton

et al. 2013

SPE Annual Technical Conference and Exhibition

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This paper describes the design, testing, installation, and performance of the first 'fully-completed' well using an intelligent inner completion inside an un-cemented liner with openhole packers for zonal isolation. The well design concept evolved from technical challenges associated with completing long cased and cemented laterals in the mature Ekofisk waterflood. The term 'fully-completed' implies full reservoir access along the pay length for production and high rate matrix acid stimulation using limited entry for fluid diversion within well segments.The paper covers the development and qualification of custom openhole 7⅝ in. liner components that can handle high differential pressures and extreme temperature fluctuations, the marriage of this complex liner with a five zone intelligent completion system, and results from a year of system integration testing. The paper also discusses the strategic placement of both mechanical openhole and inner string packers based on caliper and drilling logs; challenges met and overcome during installation; and a remarkable collection of down-hole gauge data that confirms the performance of each component before, during, and after the stimulation.The Ekofisk field waterflood began in 1987 and continues to date, exceeding expectations for improved oil recovery while mitigating reservoir compaction. As the waterflood matures, new wells are more often found partially water-swept. Limited infrastructure for lifting and handling the high water production has led to increased emphasis on isolating these water-swept intervals. Cased, cemented and perforated completions have traditionally been used for this service. It has become increasingly difficult to execute a successful cement job in longer horizontals with 4,000 ft to 8,000 ft laterals where rotation of the liner is impossible and high effective circulating densities (ECDs) limit rates during cementing. Wide variations in reservoir pore pressures, often in excess of 2,000 psi difference along the lateral, are typical of the Ekofisk chalk and exacerbate the difficulties of cementing. As a result, a new method for zonal isolation has been developed to ensure the success of future infill drilling campaigns.The design and careful planning that went into the fully-completed openhole un-cemented liner strategy resulted in a successful field trial and has proven this solution to be an effective alternative to cemented reservoir liners in long horizontals where zonal isolation is critical. Use of the intelligent well system (IWS) allowed offline acid stimulation without rig, coiledtubing, or wireline intervention. What would have traditionally been a significant water producer, with three water-swept zones totaling nearly 2,000 ft across a 4,000 ft reservoir section, has turned out to be one of the best oil producers in the field with nearly zero water cut. Production results show high productivity with highly negative acidized completion skins.With large investments in intelligent completions to provide zone-specific inflow control ...

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Section: Design Features Of the Un-cemented Liner Completionmentioning

confidence: 99%

Section: Equipment Testing and Modelingmentioning

confidence: 99%

Intelligent Completions and Un-Cemented Liners Combine to Provide a Fully Completed Solution with Zonal Isolation in Norway

Kent

Burkhead

Burton

et al. 2013

SPE Annual Technical Conference and Exhibition

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Drilling fluids

Deville

2022

Fluid Chemistry, Drilling and Completion

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A 20/80 Oil/Water Ratio Nonaqueous Screen Running System Successfully Employed In Equatorial Guinea

Paz

Lim

Patel

et al. 2013

SPE European Formation Damage Conference &Amp; Exhibition

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An innovative surfactant chemistry in a nonaqueous system with an oil-to-water ratio (OWR) of 20/80 was effectively utilized for the first time to provide wellbore stability and run a sand-control screen in an openhole gravelpack completion. This novel type of invert emulsion system uses relatively higher aqueous internal phase, i.e., less than 50/50 OWR, which subsequently allows for a relatively higher density than the drilling fluid. More importantly this system is maintained as solids free and oil continuous.The increasing application of Inflow Control Devices/Intelligent Wellbore Systems and swellable elastomers as well as drilling longer intervals and their exposure to shale/sand dictates the use of compatible and solids-reduced invert systems to reduce the risk of an unsuccessful gravel placement treatment caused by shale swelling or plugging of sand control screens. This novel high-internal phase system provides flexibility for these types of completions. The use of the higher internal phase allows the formulation of oil-continuous solids-free systems while still achieving the required density necessary in solidsladen aqueous systems. This paper will focus on the selection of the 20/80 high-internal-phase system for this openhole completion, the upfront testing and planning for deployment. Discussion will also be provided with respect to the mixing of the system at the wellsite as well as the lessons learned.

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New Approach for Completion Applications With Higher Internal Phase Inverts Utilizing Innovative Surfactants

Cited by 7 publications

References 31 publications

Intelligent Completions and Un-Cemented Liners Combine to Provide a Fully Completed Solution with Zonal Isolation in Norway

Intelligent Completions and Un-Cemented Liners Combine to Provide a Fully Completed Solution with Zonal Isolation in Norway

Drilling fluids

A 20/80 Oil/Water Ratio Nonaqueous Screen Running System Successfully Employed In Equatorial Guinea

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