Compact™ Borehole Navigation Tool


Delivers precise borehole navigation


Applications

  • Determining borehole trajectory
  • Determining total vertical depth
  • Applying speed corrections to formation evaluation data


Features and Benefits

  • Robust three-axis magnetometers and accelerometers provide precise and reliable tool-string orientation measurements, even in extreme borehole and logging conditions.
  • The unique profile of the tool facilitates deployment in wireline or memory mode to mitigate the risk of bridging events and reduce nonproductive time.


Tool Description

The Weatherford Compact borehole navigation (MBN) tool measures orthogonal components of the earth’s magnetic and gravitational fields along a wellbore. These measurements are used to compute instantaneous tilt and azimuth of a tool string, which enables derivation of the well trajectory below the casing shoe. Results are presented as a table of measured depths (MD) and true vertical depths (TVD), supported by a polar plot and vertical section plots showing north-south and east-west projections.

When the Z-axis accelerometer is sampled at a higher rate, instantaneous speed of the tool string can be determined. When the MBN tool is run as part of a Compact memory logging (CML) service, the information can be used to fine-tune and correct irregular tool movements.

MBN data is also used to confirm the rotational position of other tools in a measurement string; for example, when auxiliary equipment, such as a downward-pointing density shoe, is used to achieve a particular orientation in a horizontal well.


Specifications

Measurement

Data

Tilt, azimuth

Logging speed

1,800 to 3,600 ft/hr (9 to 18 m/min)

Measurement range

Tilt: 0 to 180°

Vertical resolution

1.0 in. (25.4 mm)

Accuracy

Tilt: ±0.1°
Azimuth: ±5°

Depth of investigation

Borehole measurement

Borehole fluids

WBM, OBM, salt, air

 

Mechanical

Maximum outer diameter

2.25 in. (57 mm)

Length

11.81 ft (3.60 m)

Weight (air)

71 lb (32 kg)

Maximum temperature

320°F (160°C)

Maximum pressure

15,000 psi (103 MPa)

Maximum borehole diameter

18 in. (457 mm)

Minimum borehole diameter

2.8 in. (70 mm)

Compact Borehole Navigation Tool

The Compact borehole navigation (MBN) tool provides precise and reliable tool-string orientation measurements.

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