SPERRY DRILLING SERVICES
Directional Casing While Drilling Overcome the challenges of wellbore instability in mature basins
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Halliburton and TESCO can deliver a complete technology and engineering solution. TESCO CASING DRILLING™ system
www.halliburton.com
Geo-Pilot® Rotary Steerable System
www.tescocorp.com
InSite Generation™ LWD System XR™ reamer
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Case History MWD Pulser
+/- 64’ Inside Csg.
Sperry Drilling Services and TESCO successfully steered a 7-5/8” x 7” casing string using Casing Drilling technology. The customer requested the ability to rotate continuously and drill with aerated fluid. This required a slimhole rotary steerable system that could operate in conjunction with electromagnetic (EM) telemetry. The directional BHA consisted of a Geo-Pilot® 5200 Series slimhole rotary steerable system, equipped with a Geo-Pilot extended gauge bit from Security DBS, the Mercury™ electromagnetic telemetry MWD system and a TESCO 8-7/8” underreamer. The rotary steerable, EM-MWD and underreamer were run below a high performance mud motor. The motor increased the RPM at the bit and underreamer for better ROP. The rotary steerable significantly improved the daily footage compared to oriented drilling with a mud motor.
PWD
7” GeoForce® Wired Motor
Stabilizer
XR™ reamer +/- 55’ “Stick-out”
The rotary steerable built angle from 12° to 20° in 6-1/8” hole at build rates of more than 4.5 °/100 ft and then maintained hole inclination. The EM telemetry provided 100% detection at more than twice the data rate of conventional telemetry.
Stabilizer Short Non-Mag DC Directional Module
Geo-Pilot® RSS Geo-Pilot® bit
Successfully Drill and Case Directional Wells with Reduced NPT
Over 2.8 Million Feet Drilled with Casing
Directional Casing While Drilling protects every foot drilled on your way to the reservoir. By providing you the ability to steer the casing, Halliburton and TESCO deliver the capability to successfully reach difficult directional targets in mature basins.
Cuttings in the reduced annular space between the casing and the borehole wall are “plastered” or smeared onto the formation face, creating a sealing mechanism that strengthens weak formations, increasing stability and reducing torque and drag.
Sections Drilled
Significant non-productive time can result when attempting to drill through formations with wellbore stability issues common in mature basins. Hole collapse, lost circulation, and stuck pipe can all lead to increased cost and time. Directional Casing While Drilling can overcome these challenges.
16
302
57 7 552 28
Casing Drilled with RSS
Directional Casing Drilling
Drilled while Coring with Casing
Drilled with retrievable assembly
Drilled with drillable shoe
Drilled with disposable bit COM PLE XITY
Integrating Proven Technologies to Achieve New Capabilities In order to steer the casing string, Halliburton has collaborated with TESCO to integrate the Geo-Pilot® rotary steerable system, InSite® Generation™ LWD, and XR™ reamer into the TESCO CASING DRILLING™ system. This collaboration has resulted in a complete solution that significantly increases your chances of reaching the reservoir in the most challenging wellbore stability environments.
TESCO CASING DRILLING™ has evolved from simple vertical drilling to complex directional profiles. (Data as of 03/08)
BENEFITS • Reduce personnel risk by eliminating casing crew • Enhance well control through continuous circulation while tripping BHA • Reduce number of casing strings required to reach TD and significantly reduce drilling cost • Reach previously undrillable targets and increase Net Present Value of your asset
FEATURES • Complete systems available for 7”, 9-5/8” and 13-3/8” casing • Short BHA “stick-out” beyond casing shoe minimizes exposure time of unstable formations • Zero rig time required for surveys due to acquisition while making connections • Zero rig time required for RSS commands using the Geo-Span® downlinking system • Precise directional control with over 12,000 available settings for the Geo-Pilot rotary steerable system • Superior borehole quality through use of Security DBS Geo-Pilot® extended gauge bits • Fully retrievable BHA ensures hole is protected during bit trips
