BoundaryTracker Resistivity

The BoundaryTrackerTM is a new generation of LWD azimuthal resistivity tool. It provides both deep-reading propagation and azimuthal resistivity measurements for well placement and formation evaluation.

The tool is designed to run with low-speed MWD systems with data telemetry rates around 1 BPS. The tool can be run above either an RSS or a motor. When run above an RSS, the tool offers two fully independent sets of azimuthal resistivity measurements, thus increasing the measurement reliability. When run above a motor, the tool offers a unique feature of continuous boundary tracking, even in a sliding mode.

In addition to 8 fully compensated high-accuracy propagation resistivity measurements, the BoundaryTrackerTM offers 256 azimuthal resistivity measurements, all fully compensated to minimize borehole and other environmental effects. Out of the numerous measurements, the tool sends, via mud pulser or EMWD, a small set of compressed data to surface in real time. On surface, the data is decompressed and then inverted with the proprietary software to produce the key parameters needed for geosteering and well placement, including the distance to bed boundaries and the bed resistivities.

The BoundaryTrackerTM tool is available in both 4.75” and 6.75” sizes. The nominal temperature and pressure ratings are 150°C and 20,000psi. Higher temperature and pressure ratings of 175°C and 25,000psi are also available.

Advantages

  • Unique feature of continuous boundary tracking, even in a sliding mode
  • Designed to run with low-speed MWD systems with data telemetry rates around 1 BPS
  • The tool can be run above either an RSS or a motor
  • Option of including Azimuthal Gamma or Pressure sensor

Features

  • 8 fully compensated propagation resistivities
  • 256 fully compensated azimuthal resistivities
  • Depth of investigation up to 20ft.
  • Rated at 150°C & 20000psi (175°C & 25000psi option)
  • Applications include: Oil-water contact mapping, Overpressure detection, Reservoir deep-boundary tracking

Specifications

Tool size4-3/4 in.6-3/4 in.
Hole size range5-7/8 in. to 6-3/4 in.8-3/8 in. to 10-5/8 in.
Max OD5-1/4 in.7 in.
Min ID1-1/4 in.2 in.
Length168 in.*168 in.*
Top connectionCustomer SpecifiedCustomer Specified
Bottom connectionCustomer SpecifiedCustomer Specified
Connection makeup torque10,000 lbf-ft*30,000 lbf-ft*
Max DLS rotating15°/100ft8°/100ft
Max DLS sliding30°/100ft16°/100ft
Max operating pressure20,000 psi / 25,000psi20,000 psi / 25,000psi
Max operating temperature150°C / 175°C150°C / 175°C
Max RPM200200
Max torque10,000 lbf-ft*35,000 lbf-ft*
Max WOB50,000 lbf*100,000 lbf*
Max sand content1%1%
PowerExternalExternal
Max flow rate~400 gpm~800 gpm
Resistivity range0.2 – 3,000 ohmm
Vertical resolution1.25ft at 1 ohmm
Depth of investigationPropagation resistivity – Up to 14ft, Azimuthal resistivity – Up to 20ft
Azimuthal resistivity sectors16
Azimuthal gamma (option) sectors16
Annular pressure (option)Up to 25,000psi

Resistivity Measurement Accuracy

MeasurementSpacingFreqRangeAccuracyRangeAccuracy
Phase Difference46”400
kHz
0.2 – 10
ohmm
2%10 – 500
ohmm
2 mmhos
2
MHz
0.2 – 20
ohmm
2%20 – 3,000
ohmm
1 mmhos
18”400
kHz
0.2 – 15
ohmm
3%5 – 250
ohmm
6 mmhos
2
MHz
0.2 – 10
ohmm
2%10 – 1,000
ohmm
1 mmhos
Attenuation46″400
kHz
0.2 – 3
ohmm
5%3 – 10
ohmm
10 mmhos
2
MHz
0.2 – 16
ohmm
5%16 – 50
ohmm
3 mmhos
18”400
kHz
0.2 – 3
ohmm
5%3 – 10
ohmm
15 mmhos
2
MHz
0.2 – 8
ohmm
5%8 – 50
ohmm
6 mmhos