FOAM ASSISTED WAG

Información del proyecto

Identificador del acuerdo de subvención: OG.-00122-96

Proyecto cerrado

Fecha de inicio 1 Enero 1997

Fecha de finalización 30 Junio 1999

Financiado con arreglo a

• Specific programme for research and technological development, including demonstration in the field of non-nuclear energy, 1994-1998

Coste total

Sin datos

Aportación de la UE

Sin datos

Coordinado por

SAGA PETROLEUM ASA
Norway

Objetivo

The purpose of this project is to demonstrate technology, based on mobility control of WAG injection by foam. The demonstration will be done in the Snorre Field, which is a stratified, heterogeneous reservoir with permeability contrasts and presence of high permeable thief zones, and as such represents a typical North Sea reservoir. The projects aims to reduce the technological and economical risk of using this technology on a general basis by validating the results derived from laboratory tests, computer simulations and related small scale field tests, by a realistic field size demonstration, and, based on that, prepare general guidelines for design of subsequent full scale operations on target and other oil fields. The technology has a potential for use in a number of North sea reservoirs, including marginal fields which does not have a gas export solution, and where the associated gas must be re-injected.L%
During the ongoing design phase, the following achievements/decisions have been made:
- Target reservoir zone has been identified as Upper Statfjord Formation
- An updated reservoir description is established, based on previous reservoir data and history matching of production data from target area.
- Reservoir models have been established based on the updated reservoir description: element model for the target area, and radial models centred at the injection well. The models are used in the design of the injection program, and will be used as a working tool during the injection phase and subsequently for evaluation of projects results.
- The stars simulator from CMG is used for reservoir simulations with foam. The simulator has been refined, and foam parameters have been established from laboratory and field data.
- The model has been used to assess the added extraction from the target reservoir.
- The surfactant system has been defined as AOS C14/16, commercial grade. The contract for delivery has been awarded to Witco S.A France.
- The injection program has been approved.
- The data acquisition program which records all injection and production data makes extensive use of non-partitioning and partitioning gas tracers and non-partitioning water tracers have been developed.
- Technical modifications have been done on the Snorre TLP to accomodate the operation
- Surfactant have been shipped to the platform
- SAG injection started in August 1998, and approximately 60% of the surfactant was used during this phase.
- Co-injection started in January 1999.
The main innovative part of this project is to qualify deep treatment of foam, with good mobility control of injected gas, in an offshore reservoir with large well spacing, using large volumes of surfactant. The foam will be (1) generated in-situ by adding surfactants to the injection water and injecting gas through the water phase (SAG injection) and (2) formed in the well tubing by simultaneous injection of surfactant, water and gas (co-injection). the foam will increase the resistance to the gas flow in the reservoir, and prevent the gas from segregating and fingering through the reservoir without displacing new reservoir fluid. Increased flow resistance will force the gas into lower areas of the reservoir, and displace oil from areas which otherwise is left un-recovered.
The project will use the WAG area of the Snorre Field to demonstrate the technology. The target part of the reservoir has been subject to WAG since 1994, and the reservoir structure and well performance data. The design of the pilot will be based on a combination of laboratory experiments and reservoir simulations. The necessary R&D work to develop the laboratory test methodology is completed, and a computer model for foam effect is formulated for use in a commercial reservoir simulator. The laboratory screening tests and the computer simulations comprise the design tools for the technology. The verification and modification of these tools by large scale field tests are essential for a full scale operation on the Snorre Field, and subsequent use of the method on other fields.
Conventional equipment for gas and water injection will be used, and the technology will not need any substantial additional equipment. The main cost factor is the surfactant which is used to generate the foam. The incremental extra ction costs are estimated to USD 4-6/bbl.
The effect of one foam treatment is expected to last for approximately two years, and the project monitoring will cover such time period.

Ámbito científico (EuroSciVoc)

• humanidades › historia y arqueología › historia
• ciencias naturales › matemáticas › matemáticas aplicadas › modelo matemático

Programa(s)

• FP4-NNE-THERMIE C - Specific programme for research and technological development, including demonstration in the field of non-nuclear energy, 1994-1998

Tema(s)

• 1.3 - MISCELLANEOUS

Convocatoria de propuestas

Datos no disponibles

Régimen de financiación

DEM - Demonstration contracts

Coordinador

SAGA PETROLEUM ASA

• Aportación de la UE: Sin datos
• Dirección: KJOERBOVN 16 ; 1301 Sandvika ; Noruega
• Coste total: Sin datos