A Review of Three Years&amp;apos; Work in Europe and Africa with an Instrumented Motor

Bruce, Steve; Bezant, P.N.; Pinnock, Simon

doi:10.2118/35053-ms

Cited by 4 publications

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Reservoir management of the Wytch Farm Oil Field, Dorset, UK: providing options for growth into later field life

Hogg

Evans

Harrison

et al. 1999

PGC

View full text Add to dashboard Cite

The Wytch Farm Oil Field, currently on plateau, produces up to 110 × 103BOPD, 17.6 × 106SCF gas and 725 tonnes LPG per day. Original reserves are 450 × 106BBL with a proven 230 × 106BBL oil equivalent remaining. The Triassic fluvio-lacustrine Sherwood Sandstone, at 1535mTVDSS (true vertical depth, subsea), is the largest and most prolific reservoir. Approximately half the reserves are in an offshore extension being developed by extended reach drilling (ERD) at step-outs of up to 10.1 km from onshore Poole Harbour. Projects to increase reserves, extend plateau and slow decline include: additional ERD wells; infill drilling; miscible gas injection; and pattern water flooding of the low nett: gross Upper Sherwood all whilst maintaining reservoir pressure.Reservoir description is central to realizing these opportunities for growth. Structural uncertainty has been reduced through acquisition of the first transition-zone 3D seismic survey in the UK. An extensive RFT (repeat formation test) and production log database has been acquired in the onshore and ERD wells. These dynamic data, together with static data from core and outcrop studies, and >21km of ERD formation evaluation logs, are used to develop a high-resolution, fluvio–lacustrine sequence architecture of the Sherwood. The deterministic model enhances predictability of flow barriers, baffles and high permeability intervals. This understanding of fluid flow and recovery provides the framework for economic evaluation, which, with clear communication of uncertainty across disciplines, is the key to successful management of the reservoir into later field life.

show abstract

Reservoir management of the Wytch Farm Oil Field, Dorset, UK: providing options for growth into later field life

Hogg

Evans

Harrison

et al. 1999

PGC

View full text Add to dashboard Cite

show abstract

The Captain Field, Block 13/22a, UK North Sea

Pinnock¹,

Clitheroe

Rose

2003

Memoirs

View full text Add to dashboard Cite

The Captain Field is located in Block 13/22a in the Western Moray Firth Basin of the UK North Sea, 80 miles NE of Aberdeen in a water depth of 340 ft. Hydrocarbons are trapped in two geographical regions, the Main and Eastern closures, both with a significant stratigraphic pinchout component. The principal reservoirs consist of turbidite sandstones of Lower Cretaceous age which have been informally subdivided into two stratigraphic units comprising the Upper and Lower Captain Sandstones. At the base of the preserved Jurassic section the Heather Sandstone, Oxfordian in age, provides a secondary reservoir. Reservoir quality is uniformly excellent in the Lower Cretaceous with in situ, Klinkenberg corrected permeability averaging 7 Darcies and porosity in the range 28-34%. The reservoir is generally poorly consolidated sandstone with the depth to the crest of the field at -2700 ft TVDss. The reservoirs contain a total oil-in-place of 1000 MMBO. The Upper Captain Sandstone has a small associated gas cap containing 16 BCF gas-in-place. The oil is heavy, by North Sea standards, with oil gravity ranging from 19° to 21° API and has high in situ viscosity, 150 to 47 cP, at the mean reservoir temperature of 87°F. The fluid properties and offshore location necessitate the employment of innovative horizontal drilling methods, completion design and artificial lift technology in order to achieve an economically viable field development. Extended reach horizontal wells, with reservoir completion lengths of up to 8000 ft, are drilled for all oil producers and water injectors. Development risks were significantly reduced following two appraisal drilling campaigns in 1990 and 1993 culminating with the successful drilling and extended testing of a prototype horizontal field development well (13/22a-10). The field is being developed in two phases, Area A and Area B. First oil production commenced from the Captain platform in March 1997 from Area A and the field now produces at between 50000 and 70000 BOPD. Area B development is now underway with first oil planned for December 2000. Completion of this phase of the development will increase the plateau production rate to 85000 BOPD.

show abstract

Application of Steerable Rotary Drilling Technology to Drill Extended Reach Wells

Colebrook

Peach

Allen

et al. 1998

IADC/SPE Drilling Conference

View full text Add to dashboard Cite

fax 01-972-952-9435. AbstractA steerable rotary drilling system (SRD system) has been used on several extended reach wells at the Wytch Farm oilfield in southern England.Recently the SRD system successfully drilled the 8½" hole section of the first well ever to have a step out of more than 10km. The record breaking well, M11SPZ/SPY, has a measured depth of 34,967ft [10,658m] and a horizontal departure of 33,181ft [10,113m]. The reservoir section required rotary drilling techniques to be used. Improvements in drilling operations and reductions in cost were made in drilling the reservoir section. This section was geosteered throughout the reservoir with the SRD system giving control of both the inclination and azimuth.The 9 5 / 8 " casing was set from surface to 28,986ft. The SRD system drilled from 29,337ft (MD) to TD at 34,967ft (MD). The SRD system drilled a total of 7,680ft in 44 days (this included a side-track for geological reasons) against the plan of 5,548ft in 49 days. This improvement against the plan was achieved largely by the elimination of the requirement to slide a steerable motor in order to steer the well. Continuous rotation of the drillstring helped reduce drillstring torque and drag and improved hole cleaning. This led to more efficient weight transfer to the bit and allowed higher average penetration rates.

show abstract

A Review of Three Years' Work in Europe and Africa with an Instrumented Motor

Cited by 4 publications

References 0 publications

Reservoir management of the Wytch Farm Oil Field, Dorset, UK: providing options for growth into later field life

Reservoir management of the Wytch Farm Oil Field, Dorset, UK: providing options for growth into later field life

The Captain Field, Block 13/22a, UK North Sea

Application of Steerable Rotary Drilling Technology to Drill Extended Reach Wells

Contact Info

Product

Resources

About