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SureLog-WPR™

A PROVEN WORKHORSE, THE WPR EXCELS IN MULTIPLE APPLICATIONS AND ENVIRONMENTS

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.

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Download Technical Data Sheets

ENG CHI RUS SPA

WPR operates in all mud types including oil-based and salt-saturated and provides real-time resistivity with flexible transmission formats.

  • Provides real-time compensation.
  • Minimizes 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.

  • 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.

  • 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

“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)

Operating Temperature 0˚ to 302˚F; 347˚F option (-18˚ to 150˚C; 175˚C option)
Pressure 20,000 psi (138 MPa)

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]

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

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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