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SureLog-WPR

Wave Propagation Resistivity Sub

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.

SureLog WPR Receiver Board

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.

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.
SureLog WPR 4.75in
SureLog WPR 3.5in

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 SizeMaximum Dogleg SeverityConnectionMax. Flow
Rate, gpm
(L/sec
SlidingRotating
3.5 in.
(89 mm)
4.625 - 4.75 in.
(117 - 121 mm)
40˚/100 ft16˚/100 ft2 7/8 AOH 1120/150 [1, 6]
(7.6/9.5)
3.75 in.
(95.25 mm)
4.75 - 5.63 in.
(121 - 143 mm)
38˚/100 ft15˚/100 ft2 7/8 AOH 1200 [2, 6]
(12.61)
4.75 in.
(121 mm)
5.625 - 6.125 in.
(142 - 165 mm)
25˚/100 ft13˚/100 ftNC38280/350 [3, 6]
(17.7/22.1)
6.75 in.
(172 mm)
8.375 - 9.875 in.
(213 - 251 mm)
24˚/100 ft10˚/100 ftNC50700 [4, 6]
(44.2)
8.0 in.
(204 mm)
12.125 - 14.75 in.
(308 - 375 mm)
15˚/100 ft8˚/100 ft6 5/8 Reg.900/1,200 [5, 6]
(63.1/75.7)

Environmental

Operating Temperature0˚ to 302˚F; 347˚F option (-18˚ to 150˚C; 175˚C option)
Pressure20,000 psi (138 MPa)

Compensated Resistivity Measurements

FrequencyMeasurementRangeAccuracy
2 MHZPhase 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 kHzPhase 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 
 UHDH
 T1T2*R1R2T3*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 InvestigationVertical
Resolution**
Short Spacing
Radius
Long Spacing
Radius
2 MHz Phase Difference21 in. (533 mm)28 in. (711 mm)8 in. (203 mm)
400 kHz Phase Difference30 in. (762 mm)39 in. (991 mm)12 in. (305 mm)
2 MHz Attenuation34 in. (866 mm)44 in. (1,118 mm)8 in. (203 mm)
400 kHz Attenuation52 in. (1,321 mm)66 in. (1,676 mm)12 in. (305 mm)
Rf = 10 ohm-m
Rxo = 0.5 ohm-m
Depth of InvestigationVertical
Resolution**
Short Spacing
Radius
Long Spacing
Radius
2 MHz Phase Difference26 in. (660 mm)37 in. (940 mm)8 in. (203 mm)
400 kHz Phase Difference36 in. (914 mm)49 in. (1,245 mm)12 in. (305 mm)
2 MHz Attenuation40 in. (1,016 mm)53 in. (1,346 mm)8 in. (203 mm)
400 kHz Attenuation60 in. (1,524 mm)76 in. (1,930 mm)12 in. (305 mm)

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