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H2S Resistant 24-Finger Caliper Tool


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Overview


The 24-finger caliper can accurately measure casing ID, three dimensionally present corrosion and scale deposition of casing inner wall, as well as perforation condition. It is typically coupled below the telemetry cartridge to transmit data back to the surface. The communication format is KWTbus and it is H2S resistant.

Application

· Corrosion assessment
· Deformation evaluation
· Perforation mapping
· Well construction determination
· Accurate location of holes or anomalies

Features

· Wide range of pipe sizes measurable
· Ease of finger replacement
· SRO/memory modes
· High H2S resistance, H2S concentration>17%

Specifications

Max. Working Temperature

175°C (347°F)

Max. Working Pressure

lOOMPa (14500Psi)

H2S Resistance

H2S concentration > 17%

OD

43mm (1.69”)

Make-up Length

1480mm (58.27”)

Tool Length

1575mm (62”)

Measuring Point

 

Fingers closed

603.5mm (23.76”)

Fingers open to the maximum

628mm (24.72”)

Transmission Mode

Mono-conductor wire

Operating Voltage

Normal 18V (WSTbus)

Operating Current

Logging: <30mA

Motoring Current

<300mA

Open/Close Time of Motor

<10mins

Max. Logging Speed

18.2m/min( 60ft/min)

(Excessive speed may influence measuring resolution and accuracy)

Transmission Protocol

KWTbus

Radius Resolution

0.076mm (0.003”)

Radius Accuracy

±0.76mm (0.03”)

Rotation Accuracy

±5° (inclination within 5 - 100°)

Inclination Accuracy

±5° (inclination within 5 - 60°)

Measuring Scope

Min.: 45mm (1 3/4, Max.: 178mm (7”)

 

Compensated temperature drift (nominal value is 125mm)

Temperature Drift

175°C(0.5h): 1.27mm (0.05”)

 

150°C(lh): 0.76mm (0.03”)

Finger Space

Max.: 23.1 mm (0.91") (fingers open for 7")

Min.: 5.84 mm (0.23") (fingers open for 1 3/4")

Finger Tip Width

Typical value: 1.2mm (0.047")

Finger Tip Radius

Typical value: 1mm (0.039")

Finger Tension

Min.: 3.7N (0.831b)

Max.: 5.5N (1.241b)

Upper Threads

KWDJ-GoA-lA

Lower Threads

KWDJ-GoA-lA


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