Layer | Fill | Outline |
---|
Map layers
Theme | Visible | Selectable | Appearance | Zoom Range (now: 0) |
---|
Fill | Stroke |
---|---|
Collaborating Authors
Williams, R.
The Acquisition and Processing of Vertical Seismic Profile in Horizontal Wells Erb West Field, Sabah, Malaysia
Hocker, C. (Sarawak Shell Petroleum Company) | Track, A. (Sarawak Shell Petroleum Company) | Cao, D. (Sarawak Shell Petroleum Company) | Williams, R. (Sarawak Shell Petroleum Company) | Dupal, L. (Sarawak Shell Petroleum Company) | Shapiro, B. (Sarawak Shell Petroleum Company)
Abstract Three Vertical Seismic Profiles and one well shoot were acquired as part of the EWDP-A revisit-3 horizontal drilling campaign in the Erb West field. The main objective in acquiring this data was to derive a reliable velocity model for the overburden in the main part of the field. By positioning the geophones in the horizontal section, and below the heavily faulted overburden, allowed for correct imaging of reservoirs immediately below the wellbore and the dipping horizons that subcrop the Shallow Regional Unconformity. Also an attempt will be made to integrate the VSP results with the newly acquired surface 3D seismic to help identify multiple patterns, and to guide the derivation of velocities for stacking and migration. The acquisition involves the deployment of a 3component, gimbal-mounted seismic geophone that is drill pipe conveyed into the well. As the tool is pushed into the hole, it is stopped at pre-determined stations, rigidly coupled to the casing, and acoustically isolated from the drillpipe to provide a good signal-to-noise ratio. The seismic source is positioned directly over the sensor, and a series of shots are recorded at each station. The main problem with processing VSP data acquired in a horizontal well is the separation of the up going from the downgoing wave fields. In conventional VSP processing this is accomplished by the geophone being vertically displaced in the wellbore. In the Erb West field, this was accomplished by using the downgoing wavefield obtained over the build up section together with differences in move out between the direct arrivals and reflected events from structurally tilted reflectors beneath the horizontal part of the hole. This allowed for the creation of a high resolution seismic image in the vicinity of the well.
- North America > United States > Texas > Wichita County (0.93)
- North America > United States > Virginia > Virginia County (0.83)
- North America > United States > Texas > Yoakum County (0.83)
- Asia > Malaysia > Sabah > South China Sea (0.83)
- Geology > Rock Type (0.69)
- Geology > Geological Subdiscipline > Stratigraphy (0.35)
SPE Members Flashing of reservoir liquids and their associated PVT behavior is critical for man), oil field operations. Conventional PVT work considers only the reservoir oil and its gas flash behavior. The presence of a water phase in the reservoir is normally neglected. It is assumed that water does not flash below its boiling point. This assumption is justified to some degree if the system contains no components which are soluble both in the water and oil such as CO2 and other gases. Most reservoir fluids contain such gases. Therefore, the conventional bubble point considerations as used for field operations are conceptually wrong. Using only two phase PVT data in petroleum operations when in reality a three-phase system exists in the field as commonly done could conceivably generate various problems related not only to the proper reservoir management but also to handling of carbonate or sulfide scale problems. The experimental data on (a) three-phase PVT work and (b) CO2 partitioning effects between oil and water under various conditions are discussed. Actual and different oil/water/gas systems from three California reservoirs were examined. The results of this work show that the three-phase PVT data are extremely important under the following field conditions:The WOR is varying and high. The GOR is varying and high. The concentration of CO2 and/or other gases which can dissolve in both oil and water phases is high. The water breakthrough occurs in a waterflooded reservoir. During CO2 flood operations. A carbonate or sulfide scale problem exists anywhere in the field. Application of inhibitors to prevent the formation of various types of scale. In principle, the phase behavior of reservoir and/or produced fluids as well as the associated CO2 partitioning effects between the various phases depend upon the following, variables:Pressure and pressure changes. Temperature and temperature changes. CO2 concentration in any of the three fluid phases potentially existing in the reservoir prior and anywhere in the system, during and after flashing of the reservoir fluids. Composition of reservoir brine (including pH), oil and gas. WOR, GOR and GWR under any set of pressure and temperature conditions. The present paper discusses the importance of three phase PVT data (including bubble point and flash behavior in the presence of CO2) and CO2 partitioning data for oilfield operations. Sampling, testing and computational procedures are described. All the discussions are supported through three-phase PVT data generated in the laboratory for three different types of reservoir fluids from California fields. Introduction In principle, the solubility of CO2 in oil or water is related to:Pressure. Temperature. P. 297^
- North America > United States > California (1.00)
- North America > United States > Texas (0.67)
- Geology > Mineral (0.54)
- Geology > Rock Type > Sedimentary Rock (0.31)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > North America Government > United States Government (0.46)
Seismic Signatures of Tectonic Lithofacies From Regional Lines, Appalachian Ultradeep Core Hole (ADCOH) Site Area
Costain, J.K. (Virginia Tech) | Coruh, C. (Virginia Tech) | Pratt, T. (Virginia Tech) | Hatcher, R.D. (Univ. of Tennessee) | Glover, L. (Virginia Tech) | Phinney, R. (Princeton University) | Diebold, J. (Lumont-Doherty Geological Observatory) | Williams, R. (Univ. of Tennessee) | Zoback, M. (Stanford University)
The oil contams almost no dissolved gab, and ultimate the world varies with the type of production. There are substantial recovery from the Mirador (estimated at 50 percent) will amounts of oil and gas to be found. Economics and politics be governed by the effectiveness of natural or artificial water will govern how soon additional reserves will be found, but by drive. Detailed mapping of genetic sand types is judged to be the use of modem concepts in exploration, the discovery rate will crucial to reservoir management. Asia and the Far East are dominated by West Zenith Exploration Co. Siberia and China.
- Asia (0.87)
- North America > Canada > Newfoundland and Labrador > Newfoundland (0.29)
- North America > United States > Texas (0.28)
- Geology > Structural Geology > Tectonics > Compressional Tectonics > Fold and Thrust Belt (1.00)
- Geology > Rock Type (1.00)
- North America > United States > Texas > Permian Basin > Yeso Formation (0.99)
- North America > United States > Texas > Permian Basin > Yates Formation (0.99)
- North America > United States > Texas > Permian Basin > Wolfcamp Formation (0.99)
- (23 more...)