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A proven workhorse, the WPR excels
in multiple applications and environments
Wave Propagation Resistivity Sub
APS's WPR™ Wave Propagation Resistivity sub is a spatially compensated, dual-frequency (400 kHz and 2 MHz), dual spacing device designed for wireline-equivalent logging while drilling (LWD) and measurements after drilling (MAD) services in all well types.
WPR’s symmetrical design, with centrally located receive antennas, provides real-time compensation, eliminates invasion effects due to measurement delays, and improves accuracy by canceling variations in receiver channels.
WPR operates in all mud types including oil-based and salt-saturated and provides real-time resistivity with flexible transmission formats. High-resolution data is stored in downhole memory which can be retrieved and processed during trips.
APS provides a complete set of software-enabled borehole corrections and applications with WPR, including a dipping bed model for geosteering.
WPR operates in all mud types including oil-based and salt-saturated
and provides real-time resistivity with flexible transmission formats.
and provides real-time resistivity with flexible transmission formats.
Features & Benefits
- Provides real-time compensation.
- Eliminates invasion effects due to measurement delays.
- Improves accuracy by canceling variations in receiver channels.
- Operates in all mud types, including oil-based and salt-saturated.
- Provides real-time resistivity with flexible transmission formats.
- High-resolution data is stored in downhole memory which can be retrieved and processed during trips.
- APS provides a complete set of software-enabled borehole corrections and applications with WPR, including a dipping bed model for geosteering.
- Pressure While Drilling (PWD) option available for 4.75 in. (121 mm), 6.75 in. (172 mm) and 8.0 in. (204 mm) WPR.
- Low operating power for maximum battery life; designed to run with turbine alternator and 0x/1x/2x/3x battery (10 cell DD), or 3x/4x batteries.
Design
- Available tool sizes: 3.5 in. (89 mm), 3.75 in. (95 mm), 4.75 in. (121 mm), 6.75 in. (172 mm) and 8.0 in. (204 mm).
- Symmetrical design with centrally located receive antennas.
- Interfaces directly with APS SureShotTM MWD.
- Hatch cover for easy access to tool programming and data dump port.
Applications
- Geosteering
- Correlation
- Pore pressure trend analysis
- Casing point selection
- Wireline replacement
- Logging while tripping
- Logging with and without the flow switch enabled (for air- and foam-drilled wells)
Tool Specifications
SureLog-WPR Sub Technical Data Sheet
General Specs
Environmental
Compensated Resistivity Measurements
Transmitter / Receiver Spacings
Depth of Investigation, Vertical Resolution
General Specifications
| "Tool Size" | Borehole Size | Maximum Dogleg Severity | Connection | Max. Flow Rate, gpm (L/sec | |
| Sliding | Rotating | ||||
| 3.5 in. (89 mm) | 4.625 - 4.75 in. (117 - 121 mm) | 40˚/100 ft | 16˚/100 ft | 2 7/8 AOH 1 | 120/150 [1, 6] (7.6/9.5) |
| 3.75 in. (95.25 mm) | 4.75 - 5.63 in. (121 - 143 mm) | 38˚/100 ft | 15˚/100 ft | 2 7/8 AOH 1 | 200 [2, 6] (12.61) |
| 4.75 in. (121 mm) | 5.625 - 6.125 in. (142 - 165 mm) | 25˚/100 ft | 13˚/100 ft | NC38 | 280/350 [3, 6] (17.7/22.1) |
| 6.75 in. (172 mm) | 8.375 - 9.875 in. (213 - 251 mm) | 24˚/100 ft | 10˚/100 ft | NC50 | 700 [4, 6] (44.2) |
| 8.0 in. (204 mm) | 12.125 - 14.75 in. (308 - 375 mm) | 15˚/100 ft | 8˚/100 ft | 6 5/8 Reg. | 900/1,200 [5, 6] (63.1/75.7) |
Environmental
| Operating Temperature | 0˚ to 302˚F; 347˚F option (-18˚ to 150˚C; 175˚C option) |
| Pressure | 20,000 psi (138 MPa) |
Compensated Resistivity Measurements
| Frequency | Measurement | Range | Accuracy |
| 2 MHZ | Phase Difference All Spacings | 0.1 – 4,000 ohm-m | ± 2% [0.1 – 25 ohm-m] ± 0.5 mmho/m [above 25 ohm-m] |
| Attenuation Near Spacing | 0.1 – 300 ohm-m | ± 2% [0.1 – 25 ohm-m] ± 1.0 mmho/m [above 25 ohm-m] | |
| Attenuation Far Spacing | 0.1 – 500 ohm-m | ± 2% [0.1 – 25 ohm-m] ± 1.0 mmho/m [above 25 ohm-m] | |
| 400 kHz | Phase Difference All Spacings | 0.1 – 4,000 ohm-m | ± 1% [0.1 – 25 ohm-m] ± 1.0 mmho/m [above 25 ohm-m] |
| Attenuation Near Spacing 0 | 0.1 – 300 ohm-m | ± 1% [0.1 – 25 ohm-m] ± 2.0 mmho/m [above 25 ohm-m] | |
| Attenuation Far Spacing | 0.1 – 500 ohm-m | ± 1% [0.1 – 25 ohm-m] ± 2.0 mmho/m [above 25 ohm-m] |
Transmitter / Receiver Spacings
| Measure Point | ||||||
| UH | DH | |||||
| T1 | T2* | R1 | R2 | T3* | T4 | |
| in. | -36.00 | -22.50 | -4.25 | +4.25 | +22.50 | +36.00 |
| mm | -914.4 | -571.5 | -107.9 | +107.9 | +571.5 | +914.4 |
Depth of Investigation, Vertical Resolution
| Rf = 1 ohm-m Rxo = 0.5 ohm-m | Depth of Investigation | Vertical Resolution** | |
| Short Spacing Radius | Long Spacing Radius | ||
| 2 MHz Phase Difference | 21 in. (533 mm) | 28 in. (711 mm) | 8 in. (203 mm) |
| 400 kHz Phase Difference | 30 in. (762 mm) | 39 in. (991 mm) | 12 in. (305 mm) |
| 2 MHz Attenuation | 34 in. (866 mm) | 44 in. (1,118 mm) | 8 in. (203 mm) |
| 400 kHz Attenuation | 52 in. (1,321 mm) | 66 in. (1,676 mm) | 12 in. (305 mm) |
| Rf = 10 ohm-m Rxo = 0.5 ohm-m | Depth of Investigation | Vertical Resolution** | |
| Short Spacing Radius | Long Spacing Radius | ||
| 2 MHz Phase Difference | 26 in. (660 mm) | 37 in. (940 mm) | 8 in. (203 mm) |
| 400 kHz Phase Difference | 36 in. (914 mm) | 49 in. (1,245 mm) | 12 in. (305 mm) |
| 2 MHz Attenuation | 40 in. (1,016 mm) | 53 in. (1,346 mm) | 8 in. (203 mm) |
| 400 kHz Attenuation | 60 in. (1,524 mm) | 76 in. (1,930 mm) | 12 in. (305 mm) |
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