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Constant Magnetic Thickness Tool


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Overview


The constant magnetic thickness tool (CMT01/04) is designed based on the principle of magnetic leakage, i.e. the magnetic leakage degree varies with the changes of casing wall thickness.
This tool comprises the constant magnetic field dual-channel inner&outer wall damage measuring cartridges which are used to measure the wall damage respectively from inside and outside. Six polar plates are adopted in the inner wall measuring cartridge, and every measuring arm consists of six groups of sensors, while the outer wall measuring cartridge uses centralized measurement, which has 36 sensors to have higher accuracy.

Benefits

· Arrayed sensors layout, radial resolution up to 10˚
· Inner wall and outer wall measuring cartridges are independent to fulfill the separate logging tasks
· Combinable with Well-sun multi-finger caliper tool (MCT)
· Simple structure and high reliability

Application

· Casing collar identification
· Casing inner wall damage identification
· Casing outer wall damage identification
· Casing wall thickness
· Perforated well interval identification

Specifications

Max Working Temperature

175°C

Max Working Pressure

80MPa

Tool OD

Outer cartridge: 85.8mm Inner cartridge: <P92mm-134mm

Tool Length

Outer cartridge: 940mm Inner cartridge: 2280mm

Make-up Length

Outer cartridge: 600mm Inner cartridge: 1940mm

Zero Point

Outer cartridge: 295mm Inner cartridge: 1078.7mm

Operating Voltage

16-18V

Operating Current

Outer: 250mA±10% Inner: 80mA±10%

Wellbore Size

5.5feet (92mm-134mm)

Receiving Sensor Qty.

Outer: 36

Inner: 36

Adjacent Angle

10°

Accuracy

<15% of wall thickness

Typical Logging Speed

150~300m/h


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