Surveillance Modeling and Operational Controls Ensure Integrity of Alaska
- Karim S. Zaki (Advantek International Corp.) | Zongyu Zhai | Ahmed S. Abou-Sayed (Advantek International Corp.) | Stephen Arthur Marinello (Pinnacle Technologies) | Michael Luther Bill (ASRC Energy Services) | Harold Robert Engel (BP Alaska Exploration Inc.)
- Document ID
- Society of Petroleum Engineers
- SPE Asia Pacific Oil and Gas Conference and Exhibition, 18-20 October, Brisbane, Queensland, Australia
- Publication Date
- Document Type
- Conference Paper
- 2010. Society of Petroleum Engineers
- 5.6.1 Open hole/cased hole log analysis, 2.4.3 Sand/Solids Control, 2.2.2 Perforating, 1.6 Drilling Operations, 3 Production and Well Operations, 2.5.1 Fracture design and containment, 6.5.3 Waste Management, 1.2.2 Geomechanics, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 5.1 Reservoir Characterisation, 4.2 Pipelines, Flowlines and Risers, 5.2 Reservoir Fluid Dynamics, 1.2.3 Rock properties, 5.5.3 Scaling Methods, 5.5.8 History Matching, 5.6.4 Drillstem/Well Testing, 5.4.2 Gas Injection Methods, 5.3.4 Integration of geomechanics in models
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Alaska's Grind and Inject (GNI) operations represent the longest and largest semi-continuous solids waste slurry injection project worldwide. More significant in the current climate of corporate responsibility is that modeling updates and assurance processes allow procedural updates to maintain efficiency and environmental integrity. The modeling program provides data for injection performance analysis and history matching that leads to better understanding of subsurface dynamics. Operational success is evidenced by unblemished capacity to accept large waste volumes with significant ultimate well disposal potential.
This paper addresses injection assurance and waste containment throughout project life. The periodic history match of created subsurface features is a major component of this process. Fracture simulation was carried out to match the subsurface response to slurry batch injection through 8 years of injection. The geomechanical modeling necessary to provide the framework on which the simulation works is described. Stress evolution and thermal effects during batch injection is also illustrated for the GNI environments. The disposal domain development has been inferred from the simulation.
The provision of designs, solutions and predictions based on the simulation sensitivity studies is described and the impact of field activities is highlighted. Designs, solutions and predictions are given based on the numerical results and sensitivity study verified by past field observations. The verification and updating of the model developed for the GNI operation is provided by the history matching of wellhead pressures through eight years of injection.
This paper assesses the impact and application of hydraulic fracture and disposal domain modeling to predict the subsurface response and ensure operational integrity during waste injection operation in the Grind and Inject (GNI) site. Injection operations initiated in the Prudhoe Bay field as a means to address pit closure, dispose of drill cuttings and other generated wastes in an environmentally friendly manner. From the beginning of the project a monitoring and assurance process was set in place to ensure the integrity of the wells throughout the life of the project.
The GNI project started in April 1998. The project initiall involved injecting waste slurry into a soft target formation in three wells, GNI-1, GNI-2, and GNI-3. Typical operations involve injecting slurry into one of the three wells continuously for 10 days, and then switching injection to another well. That is, at one time, only one injector is active while the other two wells are shut-in.
|File Size||1 MB||Number of Pages||19|