Applied production geophysics using shear-wave anisotropy: Production applications for the dipole shear imager and the multicomponent VSP

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:80197

Koster, K; Williams, M ^[1]; Esmersoy, C; Walsh, J ^[2]

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1. Amoco, Denver, CO (United States)
2. Schlumberger-Doll Research, Ridgefield, CT (United States)

In 1991, Amoco`s MCBU Hugoton team initiated a hydraulic fracture design project to optimize fracturing in the layered Chase reservoir. The project resulted in a reduction in costs for fracturing from $100k to $35k per well with much lower water rates and similar or better gas rates. A key parameter in the design of a hydraulic fracture job is the closure stress. The closure stress depends on the Poisson`s ratio, which in turn depends on the compressional and shear velocities. As part of this project, the usefulness of the Array Sonic was evaluated: often the array sonic does not measure the shear velocities accurately in the very slow shales in this area. The Dipole Shear Imager (DSI) was used as a calibration for the velocities, since this tool is accurate for very slow velocities. It is also possible to derive from the DSI measurements the direction and amount of shear wave anisotropy. From the direction of anisotropy the direction of the hydraulic fracture can be predicted. The amount of anisotropy may be used to fine tune the design of the size of the fracture job. The amount and direction of anisotropy derived from the DSI were also compared to the more familiar data of a multi-component, multi-source (McMs) VSP.

• OSTI ID: 80197
• Report Number(s): CONF-941015--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
58 GEOSCIENCES
DATA ANALYSIS
HYDRAULIC FRACTURES
HYDRAULIC FRACTURING
KANSAS
NATURAL GAS DEPOSITS
NATURAL GAS WELLS
OIL WELLS
PETROLEUM DEPOSITS
RESERVOIR ENGINEERING
SEISMIC SURVEYS
SEISMIC WAVES