SlimPulse

SlimPulse servicesThe retrievable SlimPulse* third-generationslim measurements while drilling tool provides cost-effective solutions in high-efficiency drilling environments. It wasdesigned for reliability and efficiency in real-time directional performance. SlimPulsecomponents use the same reliable andproven technology developed for the exist-ing PowerPulse* MWD telemetry systemand IMPulse* integrated MWD platform.

Using servo technology for mud pulsetelemetry, the SlimPulse tool providesdirection, inclination, toolface and gammaray measurements in real time. Servo tech-nology benefits include a fast data rate,strong signal and superior antijammingcapabilities for reliable data transmissionin difficult drilling conditions. Continuousdirection and inclination measurementsare made while drilling to facilitate trajec-tory control and reduce stationary surveymeasurements. Telemetry data automaticallyswitches between a “sliding frame” and a“rotating frame” to optimize update ratesfor improved trajectory control.

The tool is operable in a wide variety ofenvironments and fits in collar sizes from

21⁄2 to 91⁄2 in. Flowrate operating range variesfrom 35 to 1200 gal/min. The entire tool isfully retrievable and replaceable, whichsaves rig time by eliminating pipe trips fordirectional equipment.

SlimPulse tools can be upgraded to operate in temperatures as great as 350°F[177°C]; the designers capitalized on experi-ence gained on previous generation tools operating 15,000 hr in temperatures above300°F [149°C].

The system can be combined with theARC475* 43⁄4-in. drill collar resistivity tool,the AIM* At-Bit Inclination Measurementtool, the APWD* Annular Pressure WhileDrilling service and the PowerDrive* rotarysteerable system. Combining SlimPulseand AIM services provides precision trajec-tory control in hole sizes as small as 57⁄8 in.and inclination data within 1 ft of the bitwhile maintaining the retrievability of theSlimPulse MWD system. This informationis transmitted via electromagnetic telemetryto an integrated receiver sub positionedabove the downhole motor. The integratedreceiver sub contains an optional pressuresensor to monitor equivalent circulatingdensities to enhance the drilling process.

Applications

■ Continuous surveys while rotating

Benefits

■ Retrievable and replaceable for reduced lost-in-hole expo-sure and improved operatingefficiency

■ Automatic rotation detection tomaximize update rates

Features

■ High-temperature option 350°F(177°C)

■ Simple to operate under a widerange of flow rates from 35 to1200 gal/min

■ Operable in lost circulationmaterial concentrations of 50 lbm/bbl medium nut plug

■ Servo technology for faster data rates, stronger signal andsuperior antijamming capabil-ities for reliable data transmis-sion in difficult drillingconditions

Next generation retrievable MWD tool

Impeller torque

Gearbox

Resolver

Servomotor

Impellershaft

Controlelectronics

Tool housingRotary valveDrill collar

The SlimPulse tool.

SMP-4047 ©Schlumberger

August 2002 *Mark of Schlumberger

www.connect.slb.com

SlimPulse Measurement Performance Specifications

Stationary Continuous

Direction and inclination surveyInclination

Range 0 to 180° (above 20°)Accuracy ±0.1° at 1 sigma ±0.2° at 1 sigmaResolution 0.03° 0.10°

Azimuth Range 0 to 360° 30 to 330°Accuracy (above 5°) ±1° at 1 sigma ±2° at 1 sigmaResolution 0.03° 0.5°

Toolface Update period 14 to 50 sec (mode dependent) Range 0 to 360°Accuracy ±3° at 1 sigma Resolution 6°Magnetic to gravity toolface switching 3.5° or 8°

Formation evaluation Gamma ray

Range 0 to 250 API Accuracy ±6% Statistical resolution 0.5 cps Distance from bottom of tool 18.0 ft or 8.5 ft

MWD temperature Range Up to 350°F (177°C) Accuracy ±1.5°F (0.8°C) Resolution 3°F (1.7°C)

General specifications Temperature rating 350°F (177°C)Pressure rating 20,000 psiFlow range 35 to 1200 gal/minCollar size 21⁄2 to 91⁄2 in.Curvature 50°/100 ft (145°/100 ft in the short radius version)LCM 50 lbf/bbl medium nut plugMud type No restrictionsSand content 2.5%Length 26.5 ftWeight 150 lbmTool OD 13⁄4 in.Telemetry type Continuous mud siren

Miscellaneous measurementsThreshold shock measurementDownlink optionsReal-time diagnostics