How can RSS bring your independent drilling operation to the next level?
Denis Biglin, Executive Vice President at APS Technologies discusses the advantages of integrating APS SureSteer technology to the independent drillers tool string.

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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