Deepwater Horizontal Openhole Gravel Packing in Marlim Sul Field, Campos Basin, Brazil - Completion Project Learning Curve and Optimization
- Marco Acosta (BJ Services Company) | Rodrigo Farias (BJ Services Company) | Alvaro J. Vilela (BJ Services Company) | Alfredo Mendez (BJ Services Company) | Francisco A. Pineda (BJ Services Company) | Roberto L. Montanha (BJ Services Company) | Jose E. de Lima Garcia (Petrobras) | Agostinho Calderon (Petrobras S.A.) | Carlos Magno (Petrobras) | Mario Germino (Petroleo Brasileiro S.A.-PETROBRAS)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- December 2007
- Document Type
- Journal Paper
- 334 - 340
- 2007. Society of Petroleum Engineers
- 1.2.3 Rock properties, 2.5.2 Fracturing Materials (Fluids, Proppant), 2.7.1 Completion Fluids, 5.6.4 Drillstem/Well Testing, 4.1.2 Separation and Treating, 1.12.2 Logging While Drilling, 3 Production and Well Operations, 4.2 Pipelines, Flowlines and Risers, 3.2.4 Acidising, 1.8 Formation Damage, 1.7 Pressure Management, 2.4.5 Gravel pack design & evaluation, 2 Well Completion, 1.5 Drill Bits, 1.7.5 Well Control, 2.4.6 Frac and Pack, 2.4.3 Sand/Solids Control, 1.6.7 Geosteering / Reservoir Navigation, 4.2.4 Risers, 1.6 Drilling Operations, 1.10 Drilling Equipment
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Most of the deepwater Campos Basin reservoirs, offshore Brazil, have unconsolidated formations that require sand control. Openhole gravel packing has proven to be the effective completion method of choice. The main objectives were to achieve low damage ratios, maximize completion efficiencies and reduce completion time.
The project was conducted in one of the largest deepwater offshore fields in Brazil, Marlim Sul. This paper describes the learning curve and completion optimization obtained during planning, execution, and post-job analysis of six horizontal wells campaign with five water injectors and one oil producer.
A combination of integrated service lines and experienced personnel were important to achieve excellent injectivity and productivity ratios. Several key operations from drilling to completion contributed to successfully complete these wells: openhole stability, drilling practices, DIFs, wellbore clean-up, filtration, completion fluids, completion tools, sand control, gravel-pack software simulator ,and job execution.
The efficiency of the service company was measured with a system of penalties and rewards allowing the operator to monitor and measure the progress of the learning curve on completion. As a final result, the partnership between the operator and the service companies contributed to a more economic completion cost by reducing completion time, and improving well performance.
Economic development of deepwater projects demands a minimum number of wells to effectively drain the reservoir. Because of the high costs of the deepwater subsea environment, wellbore interventions must be minimized and completion life sufficient to achieve depletion of the reservoir.
Typical for the Campos Basin, the Marlim Sul reservoir is a Tertiary unconsolidated sandstone, particularly within the Oligocene and the Eocene ages, without strong water drive. It is a heavy-oil reservoir (API 17 to 24), with 32% porosity, and 2000 mD permeability. Because of the need for high-rate injection to maintain reservoir pressure, and since high-rate producers are needed for economic development, Petrobras decided to develop Marlim Sul and several of the other fields in the Campos Basin with a series of horizontal producers and horizontal injectors (Mathis and Ratterman 2001).
Marlim Sul is a giant field located offshore Rio de Janeiro, Brazil, in the Campos Basin. The field was discovered December 1987 and it has been under development since 1994. It contains 1.47 billion BOE of proved reserves and an additional 1.15 billion BOE of probable reserves. Laying in 2,625 to 8,530 ft (800 to 2600 m) water depths, the field contains 14 reservoir blocks in a 600 square kilometer area. To lessen risks, Petrobras decided to develop the field in four modules. The wells mentioned on this paper are part of Marlim Sul, Module 1, with 35 wells in total (21 producers and 14 injectors) (Priandi 2004).
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