Africa ///

Using cone penetration tests to differentiate between gas hydrates and carbonate concretions in the Niger Delta

Seismic data alone shows high P-wave values for gas hydrates and concretions, creating a need for other tests to characterize anomalies in the ocean floor.

New Rig Designs: Compact RCR series rigs work in the city, swamp or desert

Dietswell has developed the RCR series, a new drilling concept adapted to tropical and desert conditions.

New Rig Designs: Transport features enable land rig mobility over desert terrain

Bentec’s Nomad-Class rig, jointly developed with international drilling contractor KCA DEUTAG is a new land rig designed for desert terrain conditions.

Major deepwater development offshore Egypt continues tie-back expansion

A seven-year subsea field development creates expandable architecture in the Mediterranean Sea.

Putting the well in the best place in the least time

Even when drilling a mature reservoir already pierced by 52 wells (25 of them horizontal) there can be surprises. Armed with an impressive knowledge base and a comprehensive development plan, Chevron Nigeria-operator of the Nigeria National Petroleum Corp./Chevron Nigeria Ltd. Joint Venture-turned to a new technology to help develop Meji field. Meji field, discovered in 1964, consists of stacked reservoirs arrayed along a southeast trending rollover anticline and separated by numerous faults. Deposition is of Late Miocene age. The target for the four-well drilling program was an estimated 16 million bbl of oil reserves, representing a production gain of about 9,000 bopd from the field. The reservoir consists of clean middle- to upper-shoreface delta front deposits, has a strong water drive and no gas cap. So the closer the well could be drilled to the ceiling the more reserves could be accessed. Accordingly, key objectives included staying as close to the reservoir ceiling as possible...

Short-order re-design of an intelligent completion offshore Nigeria

The Okwori subsea development used expandable sand screens and intelligent control to overcome a key component failure.

Dual and intelligent completions optimize Algerian producing gas wells

At Hassi R'Mel field, dual completions could significantly improve output from multi-zone gas wells, but results from intelligent completions look even better.

Libya sees a re-birth of activity

An infusion of Western money is spurring greater exploration and development.

North Africa sees major growth

Production and activity are up in the major countries, with no end in sight.

Electric generator that uses gas flow for energy source proves robust

Chevron used the generator offshore Cabinda and had no problems with wet, corrosive gas.

New rig designs: Walking jackup works nearshore

Vol. 227 No. 12  New rig designs Walking jackup works nearshore For conventional jackups, substandard weather can mean co

Rig floor equipment: Cuttings dryer recovers oil

A 5-year-old drilling waste management operation employing a M-I SWACO Verti-G cuttings dryer has recovered some $4.5 million worth of commercial grade oil in Algeria’s Sahara Desert.

Deepwater Technology: Engineering the Benguela-Belize compliant piled tower

The Benguela-Belize project is an oil and gas production development located in Block 14 offshore Angola, West Africa. It represents the first application of compliant piled tower (CPT) technology outside of the US Gulf of Mexico, where two such structures have previously been installed. In its finished configuration, the CPT is the fifth-tallest, free-standing structure in the world, more than 30% higher than New York’s Empire State Building. The fast-track project created a bottom-founded production hub facility for six oil pools in 1,280 ft (390 m) water depth. The Benguela-Belize structure was designed to support 40 wells, 16 risers and an operating payload exceeding 40,000 metric tons. This article focuses on the process for selecting the CPT concept, and the considerations and challenges overcome, while designing and engineering the supporting tower for the drilling and production platform.

Deepwater Technology: Flow assurance requires specific design

An accurate flow assurance method requires a comprehensive look at the entire field life and changing reservoir forecasts, suggesting that customized solutions are more reliable than a generic approach. This case history addresses thermal issues encountered during the detailed design of a deepwater field offshore West Africa. The technical solutions proposed along with the detail and final design decisions made by the operating company are explored. FIELD LAYOUT AND ISSUES The field is in 1,200 – 1,600 m water depth and is produced through two drill centers (DC). Water is injected at one end of the reservoir and gas is injected at the other, presenting a wide range of fluid properties to consider. Each DC has two daisy-chained manifolds connected to six wells. The production is extracted through two 10-in. flowlines and processed to a host facility midway between the DCs. A 6-in. test line extends from each DC’s manifold to the host.

Deepwater Technology: Drilling and completion innovations deliver world-class results in Angola

Organization, new technologies and a practical design approach carry the day.

New downhole technologies helped develop horizontal thin sand

New drilling technologies and reservoir management techniques proved their worth in a completion with a 1,200-ft horizontal section in Nigeria's Niger Delta.

Hybrid riser tower system undergoes further development

After proving its merit in Angola's Girassol field, the HRT system is undergoing additional refinement for application in further ultra-deepwater developments.

Optimizing development of Angola's Girassol field

Operator Total employed 3D/4D seismic and other new testing techniques.

BG Tunisia's Advanced Process Control improves condensate product stability

BG Tunisia, the leading gas producer in Tunisia, has implemented Connoisseur* Advanced Process Control (APC) from the SimSci-Esscor* unit of Invensys on its gas condensate production system at the Hannibal plant in Sfax, Tunisia, Fig. 1. Project goals were to maximize condensate yields, improve stability of the condensate stabilization process and ensure that product quality limits are adhered to at all times.

New technology cured severe mud losses in challenging HPHT wells

A downhole well control situation, in a severe mud loss zone in the Mediterranean Sea, was solved by enhancing wellbore pressure containment.

France/Belgium: Software converts multiple CAD formats, produces 3D visualizations for Bonga

Vol. 225 No. 4 Technology from Europe: France/Belgium Software converts multiple CAD formats, produces 3D visualizations for Bonga Upstream projects are significant users of multi-million-dollar CAD models to define surface production sche