Introduction

MultiVSP is the most cost effective digital multi‑level downhole seismic array for large size downhole seismic surveys available on the market. Large size downhole survey: Improved reservoir delineation, faults & pinch‑out detection, possible simultaneous 3D VSP and 3D surface seismic acquisition, applications to geological contexts such as overhangs, salt bodies, gas clouds. 4D survey: Improved reservoir imaging resolution (statically and dynamically). Improved Signal to Noise ratio and optimized repeatability to quantify time‑lapse changes in the reservoir. Monitoring of fluid interfaces variation. Applications to water‑flooding, gas injection, CO₂ sequestration.

Applications

• Ultra High Productivity ‑ Up to 100 levels, run at 2 ms sampling rate, real‑time with short cycle times required by offshore surveys.
• Unequalled high channel count compared with standard conveyance.
• Use of the proprietary deployment system allows rapid system rig up and full system testing during deployment.
• Unique bypass function can exclude a malfunction level and allows operation continued.
• Fail safe anchoring arm design allows safe operation and retrieval in both cased hole and open hole.
• MultiVSP system uses standard GeoVSP auxiliary tools such as Gamma Ray, CCL and Tension/Compression.

Specifications

Maximum Temperature	260°F (125°C) Long Time 300°F (150°C) 4 hours 320°F (160°C) 1 hour
Maximum Pressure	15000 psi (103 MPa)
Outside Diameter	3.5 in. (89 mm)
Maximum Hole Diameter	9.17 in. (233 mm) Standard Arms 14 in. (355 mm) Extended Arms
Length	17.3 in. (440 mm)
Weight	18.7 lbs. (8.5 kg)
Anchoring Ratio	4:1
Geophone Sensor	SGO‑15HT
Number of Sensors per Axis	1
Telemetry Rate	2.5 Mbits/s on 23,000 ft. (7000 m) cable Up to 4 Mbits/s on shorter cable
Σ/△ ADC Resolution	24 bits
Sample rate	0.25 ms, 0.5 ms, 1 ms, 2 ms and 4 ms
Bandwidth	1666 Hz Max @ 0.25 ms
Maximum Levels	100
Gain	20 dB, 40 dB
Instantaneous Dynamic Range	122 dB
Wireline Requirements	7‑Conductor Cable
Hole Type	Open Hole/Cased Hole
Auxiliary Tools
Tension	Optional
Gamma Ray	Optional
CCL	Optional

MultiVSP is the most cost effective digital multi‑level downhole seismic array for large size downhole seismic surveys available on the market.