APPLICATIONS ■ HP/HT wells where temperatures to 350deg [175 degC] and pressures to 25,000psi [172.4 MPa] are reached††

■ Formation evaluation and petrophysicalanalysis ■ Bed boundary detection ■ Geosteering and well placement ■ Structural and stratigraphic dip analysis

BENEFITS ■ Real-time 4, 8, or 16 sector images ofcompensated density, photoelectricindex and standoff

■ Up to 64 sector images for memory data

■ Survey quality directional measurement

■ Borehole shape log and borehole break-out analysis

■ Dynamic standoff based density andneutron processing delivers high qualitymeasurements even in enlarged bore-holes

DENSITY SENSOR FEATURES ■ Density measurement uses rugged scin-tillation detectors for accurate formation density and photoelectric index deter-mination

■ Measurement quality factors are com-puted along with log data

NEUTRON POROSITY SENSOR FEATURES ■ LWD industry first californium-252source for neutron porosity

■ Enhanced analysis from three neutrondetectors with the 43/4 -in system

STANDOFF & CALIPER SENSOR FEATURES ■ Two ultrasonic transducers provideaccurate standoff/caliper measurements

■ Both transducers are aligned with thedensity and neutron detectors for accu-rate dynamic standoff-based processing

■ New highly rugged ultrasonic pitch-catch transducers

The SureLog™ tool family includes the iDNSC*. The iDNSC tool provides a bulk density image along with traditional bulk density, neutron porosity and PE curves. Tool standoff and hole cali-per measurements are also provided by a pair of ultrasonic transducers which can also be used to environmentally correct the neutron porosity curve.

iDNSC ToolThe iDNSC density imaging tool records data in an industry leading extra high density format on a large memory module to enable high quality well statistics for calculation of the bulk density curve and the bulk density image. The extra-high resolution imaging service extracts the detail contained in this large number of nuclear counts by a combination of various techniques pro-viding clarity in 128 sectors, a feature not yet seen on other on density images.

The extra-high resolution images clearly reveal faults and fractures along with internal features of reservoir rocks more closely associated with high resolution wireline tools and micro-electrode LWD imagers. A distinct advantage of the iDNSC tool over LWD micro-electrode type imagers is the ability to generate images in oil-based muds.

Applications of the extra-high resolution imaging tool include fault and fracture charac-terization, rock stress distribution, facies characterization and potential cleat and fracture characterization for optimum well placement in the reservoir, specifically in coal-bed-methane reservoirs.

The iDNSC tool can be configured to operate in drilling environments with temperatures to350 degF [175 degC] and pressures to 25,000 psi [172.4] MPa.

Density Imaging Service

3D Caliper ImageDensity Image

Tool Specifications

Nominal tool OD, in [mm] 4 3/4 [120.7] 6 3/4 [171.5]

Hole size, in [mm] 5 7/8 to 7 7/8 [149.2 to 200.0] 8 1/2 to 9 7/8 [215.9 to 250.8]

Tool length, ft [m] 19.6 [5.98] 19.8 [6.04]

Battery length, ft [m] 15.5 [4.7] 15.5 [4.7]

Flow rates, gal/min [m3/min] 0 to 375 [0 to 1.420] 0 to 750 [0 to 2.839]

Pressure drop in water, psi [kPa]

@750 gal/min n/a 250

@500 gal/min n/a 85

@375 gal/min 65 50

@250 gal/min 29 n/a

@100 gal/min 6 n/a

Density Sensor SpecificationsMeasurement/detector type gamma-gamma/Nal scintillation Source isotope cesium-137

Source activity 1.7 Ci (63 GBq)

Measurement Range Accuracy Repeatability Vertical Resolution, in [mm]**Density, g/cm3 1.0 to 3.1 ± 0.015 ± 0.011 15 [381.0]

Density porosity, p.u. 0 to 100 ± 0.9 ± 0.7 15 [381.0]

Photoelectric index 0 to 6 ± 0.25 ± 0.25 3 [76.2]

Maximum standoff, in [mm] 1 [25.4] Samples per second 0.016 Ci (0.6 GBq)

Accumulation interval, sec 2 to 60

Neutron Porosity SpecificationsMeasurement type/detector type neutron-neutron/helium-3 Source isotope californium-252

Source Activity 0.016 Ci (0.6 GBq)

Measurement Range Accuracy Repeatability Vertical Resolution, in [mm]

Neutron porosity, p.u. 0 to 100 ± 1.5 ± 0.9 22 [558.8]

Maximum standoff, in [mm] 3 [76.2] Accumulation interval, sec 100

Standoff Caliper Sensor Specifications

Measurement detector type ultrasonic/piezoelectric Number of transducers 2

Samples per second 100

Measurement Water Base Mud Oil Base Mud

Mud weight range, lb/gal [g/cc] 8.3 to 18 [1.000 to 2.159] 8 to 14 [0.965 to 1.679]

@ 10 lb/gal, max. standoff, in [mm] 3.0 [76.2] 2.5 [63.5]

@ 14 lb/gal, max. standoff, in [mm] 2.5 [63.5] 2.0 [50.8]

@ 18 lb/gal, max. standoff, in [mm] 1.5 [38.1] n/a

Standoff accuracy, in [mm] ±0.1 [2.54] Caliper accuracy†, in [mm] ± 0.15 [3.81]

Environmental Specifications

Max. allowable vibration, g [m/s2]

20 [196.1] Grms random, 5 to 1,000 Hz Max. allowable shock, g [m/s2] 500 [4,903.3]

Max. allowable temp., degF [degC] 302 [150], 350 [175]††

Max. working press., psi [MPa] 25,000 [172.4]

Mud sand content, percent 1 †Accuracy of caliper function is speed of sound in drilling fluid††Standard tool configuration 32 to 302 degF [0 to 150 degC], optional Survivor Series rating 32 to 350 degF [0 to 175 degC].

*Mark of Schlumberger.Copyright © 2018 APS Technology, Inc. All rights reserved. Rev. 20180510vA.0205-10-2018

iDNSC 475 Mechanical SpecificationsDensity Imaging Tool

19.6 ft[5.98] m

14.9 ft[4.54] m

13.9 ft[4.24] m

10.8 ft[3.29] m

10.3 ft[3.14] m

9.6 ft[2.93] m

5.9 ft[1.80] m

Neutronmeasurepoint

Neutronsource

2 Calipermeasurepoints

Density source

Densitymeasurepoints

4 FH

3 ½ IFPin

4 FHBox

Directionalmeasurepoints

4 FH

XOSub†

2.2ft[0.7] m

5.6 ft[1.71] m

Tool Specifications

Nominal OD, in [mm] 4.75 [120.7] Max. OD, in [mm] 5.75 [146.1]

Internal diameters, in [mm]

3.55 [90.2], 3.00 [76.2], 2.50 [63.5]

Length, ft [m] 29.9 [9.12]

Tool joints, box x pin 4 FH (NC 40), 3 ½ API IF (NC 38)

Weight, lbm [kg] 1,050 [476]

Equivalent stiffness, in [mm]

4.92 [125.0] OD/ 2.25 [57.2] ID

Avg. moment of inertia, in4 [cm4]

21.56 [897.4]

Tool Joint Specifications

API 4 FH (NC 40)

Makeup torque, lbf.ft [N.m] 10,500 [14,236]

Bending-strength ratio 2.56

API 4 FH (NC 40)

Makeup torque, lbf.ft [N.m] 10,500 [14,236]

Bending-strength ratio 2.56

API 4 FH (NC 40)

Makeup torque, lbf.ft [N.m] 10,500 [14,236]

Bending-strength ratio 2.56

API 3 ½ IF (NC 38)

Makeup torque, lbf.ft [N.m] 10,000 [13,558]

Bending-strength ratio 2.36

Operating Speci� cations

Max. dogleg, rotating, deg/ft

15/100 Max. dogleg, sliding, deg/ft

30/100

Max. compression, lb [kg]

20,000 [9,070] Max. tension,lb [kg]

263,000 [119,274]

Max. torque, lbf.ft [N.m]

9,500 [12,880] Max. RPM 250

Max. temp., degF [degC]

302 [150], 350 [175]††

Transportation Basket

Length, ft [m] 30.5 [9.3] Width, ft [m] 2.8 [0.9]

Height, ft [m] 2.5 [0.8] Weight, lbm [kg] 1,400 [635]

Gross Weight

Tool and basket, lbm [kg]

4,650 [2,109]

0.30 ft, [0.09] m

*iDNSC is a mark of Schlumberger.Copyright © 2018 APS Technology, Inc. All rights reserved. Rev. 20180510vA.0205-10-2018

Note: All dimensions are nominal. Con� guration options are available. Tool drawing is not to scale.†Optional spiral stabilizer on XO sub.††Standard tool configuration 32 to 302 degF [0 to 150 degC], optional Survivor Series rating 32 to 350 degF [0 to 175 degC].

Extension sub

iDNSC 675 Mechanical SpecificationsDensity Imaging Tool

19.83 ft[6.05] m

14.97 ft[4.56] m

13.97 ft[4.26] m

10.72 ft[3.27] m

10.33 ft[3.15] m

9.62 ft[2.93] m

6.01 ft[1.83] m

2.16 ft[0.66] m

Neutronmeasurepoint

Neutronsource

2 Calipermeasurepoints

Density SourceDensitymeasurepoints

5 ½ FH

Extension sub

5 ½ FH

5 ½ FHPin

XO Sub†

5 ½ FHBox

5 ½ FH

Extension

XO Sub

Directionalmeasurepoints

5.80 ft[1.77] m

Tool Specifications

Nominal OD, in [mm] 6 ¼ [171.5] Max. OD, in [mm] 8.25 [209.6]

Internal diameters, in [mm]

4.90 [124.5], 4.63 [117.6], 3.85 [97.8],

3.75 [95.3]

Length, ft [m] 19.8 [6.04]

Tool joints, Box x Pin 5 ½ FH Weight, lbm [kg] 2,050 [4,520]

Equivalent stiffness,

in [mm]

6.68 [1169.7] OD/ 2.81 [71.4] ID

Average moment of inertia, in4 [cm4]

94.64 [3,939.2]

Tool Joint Specifications

API 5 ½ FH (field)

Makeup torque, lbf.ft [N.m] 28,500 [36,641]

Bending-strength ratio 1.93

API 5 ½ FH (shop)

Makeup torque, lbf.ft [N.m] 28,500 [36,641]

Bending-strength ratio 1.93

API 5 ½ FH (shop)

Makeup torque, lbf.ft [N.m] 28,500 [36,641]

Bending-strength ratio 1.93

API 5 ½ FH (field)

Makeup torque, lbf.ft [N.m] 28,500 [36,641]

Bending-strength ratio 1.93

Operating Speci� cations

Max. dogleg, rotating, deg/ft

10/100 Max. dogleg, slid-ing, deg/ft

16/100

Max. compression, lb [kg]

50,000 [22,676] Max. tension, lb [kg]

350,000 [158,730]

Max. torque, lbf.ft [N.m] 28,000 [37,963] Max. RPM 250

Max. temp., degF [degC] 302 [150], 350 [175]††

Transportation Basket

Length, ft [m] 30.5 [9.3] Width, ft [m] 2.8 [0.9]

Height, ft [m] 2.5 [0.8] Weight, lbm [kg] 2,150 [975]

Gross Weight

Tool and basket, lbm [kg] 5,400 [2,449]

Note: All dimensions are nominal. Con� guration options are available. Tool drawing is not to scale.†Optional spiral stabilizer on XO sub.††Standard tool configuration 32 to 302 degF [0 to 150 degC], optional Survivor Series rating 32 to 350 degF [0 to 175 degC].

2.81 ft[0.86] m

*iDNSC is a mark of Schlumberger.Copyright © 2018 APS Technology, Inc. All rights reserved. Rev. 20180510vA.0205-10-2018