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 size | 4-3/4 in. | 6-3/4 in. |
| Hole size range | 5-7/8 in. to 6-3/4 in. | 8-3/8 in. to 10-5/8 in. |
| Max OD | 5-1/4 in. | 7 in. |
| Min ID | 1-1/4 in. | 2 in. |
| Length | 168 in.* | 168 in.* |
| Top connection | Customer Specified | Customer Specified |
| Bottom connection | Customer Specified | Customer Specified |
| Connection makeup torque | 10,000 lbf-ft* | 30,000 lbf-ft* |
| Max DLS rotating | 15°/100ft | 8°/100ft |
| Max DLS sliding | 30°/100ft | 16°/100ft |
| Max operating pressure | 20,000 psi / 25,000psi | 20,000 psi / 25,000psi |
| Max operating temperature | 150°C / 175°C | 150°C / 175°C |
| Max RPM | 200 | 200 |
| Max torque | 10,000 lbf-ft* | 35,000 lbf-ft* |
| Max WOB | 50,000 lbf* | 100,000 lbf* |
| Max sand content | 1% | 1% |
| Power | External | External |
| Max flow rate | ~400 gpm | ~800 gpm |
| Resistivity range | 0.2 – 3,000 ohmm |
| Vertical resolution | 1.25ft at 1 ohmm |
| Depth of investigation | Propagation resistivity – Up to 14ft, Azimuthal resistivity – Up to 20ft |
| Azimuthal resistivity sectors | 16 |
| Azimuthal gamma (option) sectors | 16 |
| Annular pressure (option) | Up to 25,000psi |
Resistivity Measurement Accuracy
| Measurement | Spacing | Freq | Range | Accuracy | Range | Accuracy |
|---|---|---|---|---|---|---|
| Phase Difference | 46” | 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 | ||
| Attenuation | 46″ | 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 |