Description
The Noise Survey Tool is an analog output instrument designed to “listen” to downhole noise ranging from 200Hz to 6kHz. The tool has a 2 stage gain; high gain mode at 50 volts and low gain mode at 70 volts. The NST is a valuable aid for detecting noise caused by small gas leaks caused as bubbles percolate through the wellbore liquid, as well as turbulent flow caused by fluids flowing through tight restrictions in the well, or behind casing through cement or formation channeling.
Ratings & Dimensions
|
Max Temperature |
350°F (177°C) |
|
Maximum Pressure |
20,000 psi (138 MPa) |
|
Outer Diameter |
1.38 in (35.1 mm) |
|
Length |
3.8 ft (1158.24 mm) |
|
Weight |
8.0 lb (3.64 kg) |
|
Min Csg/Tbg OD: |
2.38 in (60.45 mm) |
|
Max Csg/Tbg OD: |
20.0 in (508.0 mm) |
|
Measure Point |
Acoustic Noise Signal: 8.76 in (222.5 mm) |
Borehole Conditions
|
Borehole Fluids |
Salt, Fresh and Oil |
|
Tool Positioning |
Centralized & Eccentralized |
|
Logging Speed |
Stationary |
Hardware Characteristics
|
Sensor Type |
Stacked Piezoelectric Crystals |
|
Transmission Type |
Analog Audio |
|
Sample Rate |
Continuous Analog |
|
Audio Range |
Full Spectrum Audio |
|
Combinability |
Temperature | Casing Collar Locator |
Measurements
|
Principle |
Acoustic Noise |
|
Range |
1 to 2000 mV |
|
Primary Curves* |
200 Hz, 600 Hz, 1kHz, 2kHz, 4kHz, 6kHz |
|
Secondary Curves |
None |
*Curves are surface generated. Outputs based upon WarriorTM systems.
Version Control: 2022.02.15
On-line specifications are for REFERENCE ONLY and subject to change without notice. DO NOT USE FOR FIELD OPERATIONS.
