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| | HydroSeis™ - Seismic-While-Drilling Source
This tool incorporates a flow interruption
valve with a sweep modulator, designed to provide a useful seismic source at the
bit for reverse vertical seismic profiling (rVSP). This source allows
seismic-while-drilling with a PDC bit. The tool, has been used to demonstrate seismic profiling and
look-ahead seismic imaging-while drilling.
HydroSeis™ provides:
 |
Real-time reverse vertical seismic profiling while
drilling |
|
High-resolution look-ahead imaging while drilling |
|
Independent compression and shear wave source |
|
Vertical or inclined wellbore |
|
Early warning of gas kicks |
|
Crosswell surveys |
| All-metal construction for
high-temperature, high-pressure, sour gas service. |
Tempress is seeking opportunities for a
field trial of this tool
Bit Face Pressure
Signal, psi
Time, seconds
|
HydroSeis™
Tool Specifications
|
|
Bit size
|
8.50 inch
(7.75 min.)
|
|
Tool OD
|
6.5 inch
|
|
Upper
connection
|
Box, 4.5 API
IF (API NC50)
|
|
Lower
connection
|
Box, 4.5 API
REG
|
|
Length
|
40 inch
|
|
Weight
(incl. Cartridge)
|
250 inch
|
|
Cartridge
diameter
|
3.50 inch
|
|
Cartridge
length
|
28.7 inch
|
|
Cartridge
weight
|
41.9 inch
|
|
Bit nozzle
flow area
|
0.589 in2
(three 0.500” nozzles)
|
|
Valve min.
flow area
|
1.18 in2
(including bypass ports)
|
|
Flow rate
|
300-600 gpm
|
|
Mud type
|
water or oil
based
|
|
Differential
pressure across valve
|
170 psi @ 10
ppg 400 gpm
|
|
Differential
pressure across bit
|
200 psi
recommended, 400 psi max
|
|
Cycle rate
range
|
5-20 Hz
|
|
Upstream
pulse amplitude
|
800 psi @ 10
ppg
|
|
Suction
pulse amplitude
|
280
psi @ 10 ppg
|
|
Maximum Lost Circulation Material
|
.375 inch
|
Swept Impulse Signal INP113.WAV
Seismic-While Drilling
Paper
|
