Bill DuBose, Schlumberger

Bill DuBose, Schlumberger

Directional Casing While DrillingBill B. DuBoseSenior Drilling SpecialistSchlumberger Drilling and MeasurementsPhone: 337-296-7909E-mail: BDubose@

Directional Casing While Drilling With RSS1 st Schlumberger Directional Casing while Drilling with RSS Jobin 2004We have used Directional Casing while Drilling with RSS on thefollowing wells.1 in Norway ( Offshore ) with exhaustive testing in CTF prior tojob3 in Qatar ( Offshore)1 in Indonesia ( Offshore )1 in Germany ( Offshore)3 in South Texas ( Land )5 in Colorado ( Land )1 In Wyoming ( Land )On the above listed wells we drilled multiple Hole Sections withDirectional Casing while Drilling with RSS.

Directional Casing While Drilling With RSSCasing Sizes and Footage Drilled with Schlumberger RSS10¾” -- 4,618 feet9 5/8” – 8,091 feet7 5/8” – 8,178 feet7” -- 43,517 feetTotal of 66,404’ Drilled using RSS92 % of above footage was Drilled Directionally

Directional Casing While Drilling With RSSRSS Tools UsedPower Drive X-5 – Push the Bit SystemPower Drive Xceed - Point the Bit System.We have used both systems depending on localconditions and accepted practices in the region wherethe work is located.We have drilled hole sizes ranging from 17 ½” x 12 ¼”down to 8 7/8 ”x 6 ½” in Directional Casing whileDrilling with RSS applications. We utilized RSSTechnology with TESCO Underreamers and Casingwhile Drilling tools.

Directional Casing While Drilling With RSSThe next step in Directional Casing while Drilling withRSS Technology is to go to a smaller casing size.We have seen a overwhelming acceptance ofDirectional Casing while Drilling with RSS in thesmaller hole sizes. For 7” Casing we have seen 500%more footage drilled than with the larger sizes ofcasing.We propose to use our Ultra Slim Hole Crossbow RSS todrill with 5 ½” Casing.

Crossbow RSS Results From Operator andService Provider Collaboration Shell, Statoil and BPoffered fundingBased on the 4¾-in.Power Drive X5success Specifications set byabove OperatorsParameterHole sizeDogleg capabilityTarget SpecificationNot less than 3.875 in.Temperature Up to 150°CPressureFlow rateSurface RPM> 10 deg/100 ft but < 15 deg/100 ftUp to 15,000 psi> 80 gpm but < 140 gpm> 20 rpm but < 80 rpmSlimpulseARC3MotorReamerPowerDrive Xbow

PowerDrive Crossbow SpecificationsParameterSpecificationNominal OD 3 1/4”Bit Size 3 7/8”Hole opening Up to 4 ½”Flow rate*Maximum RPMMaximum TemperatureOperating PressureDogleg capabilityPass thru (3 7/8” hole)Maximum weight on bit300 – 530 l/min (80-140 GPM)6.7 Hz (400 RPM)150°C (302°F)1,400 Bar (20,000 psi)15°/30m (100 ft)25°/30m (100ft) rotating50°/30m (100ft) sliding2.2 tonnes (5000lbs)•Using 2 flow kits: 80-120 and 100-140 GPM•For more Information see SPE Paper # 96329

Directional Casing while Drilling with RSSTo Perform Directional Casing while Drilling with Slim hole RSSA Downhole Latch Assembly (DLA) was requiredTESCO has developed a series of DLA;s which are Wire line RetrievableDrill Pipe Retrievable and a Pump Down Reverse Out system for larger sizesTESCO has now developed a DLA for 5 ½” Casing to meet the requirements insmaller casing sizesLatch SleevePacker CupsAxial LocksTorque Dogs

Directional Casing While Drilling With RSS

Directional Casing while Drilling with RSSIn combination with TESCO who provides the LatchingTools and Equipment , utilizing Crossbow Ultra SlimHole RSS we are working to provide a solution toDirectional Casing while Drilling with RSS available forSmaller sizes of Casing than Previously Attempted.We intend to combine Tested and Accepted technologyin a measured Step by Step Collaboration effort toAdvance the Directional Casing while Drilling with RSSServices.

Questions?Bill B. DuBoseSenior Drilling SpecialistE-mail : BDubose @ slb.comPhone: 337- 296-7909

Mandatory Attribution Slide(this title should not display)© 2008 Schlumberger. All rights reserved.An asterisk is used throughout this presentation to denote a markof Schlumberger. Other company, product, and service names arethe properties of their respective owners.

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