Rotary steerablesystem for performancedrilling

PowerDrive X5

Application ■ Performance drilling, from

spud to total depth

Benefits ■ Operates reliably in hot holes

■ Provides structural informa-tion close to bit for real-timedetection of dip and faultboundaries

■ Increases time on bottomthrough efficient downlinkingand trajectory lock-in

■ Optimizes rate of penetration

■ Decreases risk of sticking

■ Improves borehole qualityand hole cleaning to reducedrilling torque and facilitaterunning of casing

■ Maximizes length of drain-hole in pay through precisedirectional control, tightcontrol of true vertical depth(TVD), and near-bit formationevaluation data

■ Optimizes casing and coringpoint selection

Features ■ Reliable operations at temper-

atures up to 302°F [150°C]

■ Optional near-bit azimuthalgamma ray measurementsand imaging

■ Automatic inclination hold in tangent and horizontal sections

■ Fully rotating system

■ Good cuttings flow characteristics

■ Improved downlink whiledrilling

■ Reaming, backreaming, anddrilling out of shoe usingstandard drilling practice

■ Directional measurementsnear bit, including azimuth at bit

■ Electronics based on industry-leading PowerPulse*measurement-while-drilling(MWD) telemetry systemtechnology

■ Simple, rugged steering sectiondesigned for performanceand reliability

Developed for performance directionaldrillingSchlumberger’s objective when providingdirectional drilling services is to drill fromshoe to total depth in one run, every time,at maximum rate of penetration (ROP). ThePowerDrive X5* rotary steerable system(RSS) was developed with that objectivein mind.

This system represents a step change inreliability and efficiency, facilitating thedrilling of longer runs, optimizing wellboreplacement, and reducing drilling time. Thecost savings that result can be direct andsubstantial.

An automatic inclination hold and effi-cient downlink function minimize theinteraction with the directional drillerneeded to maintain directional controlwhile drilling ahead. Less time needed forsurface interaction means more time spentdrilling—up to 15% improvement in drillingperformance has resulted from increasingproductive time on bottom every drilling day.

All PowerDrive X5 external parts rotate.That rotation reduces drag, improves ROP,decreases the risk of differential or mechan-ical sticking, and achieves superior holecleaning and conditioning.

Working in combination with the system’sautomatic trajectory functionality, the fullrotation increases wellbore smoothnessand decreases tortuosity. This reducesdrilling torque, improves drilling efficiency,and eliminates the need for unplannedwiper trips. The smooth wellbore alsomakes it easier to run casing and simplifiesactivities later in the life of the well, suchas coiled tubing intervention and electricalsubmersible pump installation.

Engineered for reliabilityThe PowerDrive X5 system is engineered todeliver a step change in reliability. A robuststeering section and advanced coatingmaterials that mitigate wear ensure reliable,consistent performance in a wide range ofdrilling environments.

Good drilling performance because of simple, rugged steering section.

Directional measurements near bit, for precise TVD directional control.

Fully rotating PowerDrive X5 system.

Optimized flow profiles reduce therisk of sticking, limit the effects of mudsolids, and reduce erosion of internaland external downhole components. Thesystem’s electronics, which are chassismounted for reliability and durability, canoperate in downhole temperatures ashigh as 302°F [150°C].

Designed for accurate drilling and wellboreplacement The availability of near-bit measurementsin real time ensures accurate, efficientdrilling and wellbore placement. Theefficient downlink systems and automaticinclination hold provide a smooth tan-gent section and improve true verticaldepth accuracy in the horizontal section—critical for maximizing recoverablereserves and the well’s productionpotential.

An MWD-type triaxial sensor packageclose to the bit provides accurate azimuthand inclination directional information,

which allows fast, responsive directional control in either automatic or manualoperation mode.

Once a target formation has been pene-trated, the trajectory can be “locked in”using the inclination hold functionality.No further input is required from thedirectional driller.

Steering decisions are further aided byan optional real-time azimuthal gamma raymeasurement and imaging of the wellboreto provide information on formation dipor fault boundaries. An azimuthal gammaray sensor, 61⁄2 ft [2 m] from the bit,enables drillers and geologists to identifybed boundaries quickly, allowing fasterresponse to formation changes and wellplacement optimization. Casing and cor-ing point detection is optimal, penetrationof formations to be cored is minimized,and the chances of drilling through apotentially valuable core section or wast-ing time coring an uninteresting formationare significantly reduced.

Operates in downhole temperatures as high as 302°F [150°C]. Near-bit azimuthal gamma ray for wellbore placement and dip and fault determination.

The PowerDrive X5 system—engineered from the ground up.

PowerDrive X5 System

Specifications

PowerDrive X5 475 †

PowerDrive X5 675

PowerDrive X5 825

†Pow

erDrive X5 900 †Pow

erDrive X5 1100 †

Nominal OD (API)

4.75 in. [120.7 mm

]6.75 in. [171.5 m

m]

8.25 in. [209.6 mm

]9.00 in. [228.6 m

m]

9.50 in. [241.3 mm

]

Hole size5

3⁄4in. to 61⁄2in.

81⁄2in. to 9

7⁄8in.10

5⁄8in.12

1⁄4in. to 143⁄4in.

16 in. to 22 in.

Overall length14.95 ft [4.56 m

]13.48 ft [4.11 m

]14.60 ft [4.45 m

]14.60 ft [4.45 m

]15.10 ft [4.60 m

]

Max. collar dogleg

20°/100 ft [20°/30 m] sliding,

20°/100 ft [20°/30 m] sliding,

20°/100 ft [20°/30 m] sliding,

20°/100 ft [20°/30 m] sliding,

20°/100 ft [20°/30 m] sliding,

10°/100 ft [10°/30 m] rotating

10°/100 ft [10°/30 m] rotating

10°/100 ft [10°/30 m] rotating

10°/100 ft [10°/30 m] rotating

10°/100 ft [10°/30 m] rotating

Build rate0°– 8°/100 ft

0°– 8°/100 ft0°– 8°/100 ft

0°– 5°/100 ft0°–

3°/100 ft

Max. operating torque

4,000 ft-lbf [5,420 N·m]

16,000 ft-lbf [21,700 N·m]

16,000 ft-lbf [21,700 N·m]

48,000 ft-lbf [65,000 N·m]

48,000 ft-lbf [65,000 N-m

]

Max. operating load

340,000 lbf [1,500,000 N]1,100,000 lbf [4,900,000 N]

1,100,000 lbf [4,900,000 N]1,400,000 lbf [6,20,000 N]

2,280,000 lbf [10,140,000 N]

Max. W

OB‡

50,000 lbf [223,000 N] 65,000 lbf [290,000 N]

65,000 lbf [290,000 N]65,000 lbf [290,000 N]

65,000 lbf [290,000 N]

Weight of assem

bly in air754 lbf [3,300 N]

1,700 lbf [7,500 N]1,900 lbf [8,455 N]

2,370 lbf [10,500 N]2,584 lbf [11,490 N

]

Max. LCM

§35 lbm

/bbl nut plug50 lbm

/bbl nut plug50 lbm

/bbl nut plug50 lbm

/bbl nut plug50 lbm

/bbl nut plug

Flow range

220–400 gpm [830–1,500 L/m

in]320–650 gpm

[1,200–2.460 L/min]

480–1,500 gpm [1,800–6,800 L/m

in]480–1,900 gpm

[1,800–7,200 L/min]

480–1,900 gpm [1,820–7,200 L/m

in]

Lateral vibrationsShock level 3 (50 g

threshold), 30-min lim

itShock level 3 (50 g

threshold), 30-min lim

itShock level 3 (50 g

threshold), 30-min lim

itShock level 3 (50 g

threshold), 30-min lim

itShock level 3 (50 g

threshold), 30-min lim

it

Stick-slip±

100% m

ean rotational speed, 30-min lim

it±

100% m

ean rotational speed, 30-min lim

it±

100% m

ean rotational speed, 30-min lim

it±

100% m

ean rotational speed, 30-min lim

it±

100% m

ean rotational speed, 30-min lim

it

Max. rotational speed

250 rpm220 rpm

220 rpm200 rpm

200 rpm

Max. tem

perature302°F [150°C]

302°F [150°C]302°F [150°C]

302°F [150°C]302°F [150°C]

Max. hydrostatic pressure

20,000 psi [138 MPa]

20,000 psi [138 MPa]

20,000 psi [138 MPa]

20,000 psi [138 MPa]

20,000 psi [138 MPa]

Pressure drop across toolDensity (in ppg) ×

Flow (in gpm

)Density (in ppg) ×

Flow (in gpm

)Density (in ppg) ×

Flow (in gpm

)Density (in ppg) ×

Flow (in gpm

)Density (in ppg) ×

Flow (in gpm

)

14,500 56,000

56,000259,000

337,500

Recomm

ended pressure drop across bit600–800 psi [4.1–5.5 M

Pa]600–800 psi [4.1–5.5 M

Pa]600–800 psi [4.1–5.5 M

Pa]600–800 psi [4.1–5.5 M

Pa]600–800 psi [4.1–5.5 M

Pa]

Mud sand content

1% by volum

e1%

by volume

1% by volum

e1%

by volume

1% by volum

e

Rotary Connections

Collar upper connection3

1⁄2in. IF box4

1⁄2in. IF box6

5⁄8in. reg box6

5⁄8in. reg box7

5⁄8in. reg box

Bit box3

1⁄2in. reg4

1⁄2in. reg6

5⁄8in. reg6

5⁄8in. reg7

5⁄8in. reg

Sensors

Bit box to gamm

a ray5.86 ft [1.79 m

]6.40 ft [1.95 m

]7.56 ft [2.30 m

]7.56 ft [2.30 m

]7.97 ft [2.43 m

]

Bit box to inclination6.73 ft [2.05 m

]7.27 ft [2.21 m

]8.43 ft [2.57 m

]8.43 ft [2.57 m

]8.83 ft [2.69 m

]

Bit box to azimuth

8.83 ft [2.69 m]

9.37 ft [2.85 m]

10.53 ft [3.21 m]

10.53 ft [3.21 m]

10.93 ft [3.33 m]

Inclination accuracy±

0.4°(0.05°

resolution)±

0.4°(0.05°

resolution)±

0.4°(0.05°

resolution)±

0.4°(0.05°

resolution)±

0.4°(0.05°

resolution)

Azimuth accuracy

±0.8°

(0.10°resolution)

±0.8°

(0.10°resolution)

±0.8°

(0.10°resolution)

±0.8°

(0.10°resolution)

±0.8°

(0.10°resolution)

Gamm

a ray accuracy, azimuthal 4-quadrant

±5%

(30-s averaging window

)±

5% (30-s averaging w

indow)

±5%

(30-s averaging window

)±

5% (30-s averaging w

indow)

±5%

(30-s averaging window

)

Shock detector threshold, radial50 g

±5 g

(±500 g

max. peak)

50 g±

5 g(±

500 gm

ax. peak)50 g

±5 g

(±500 g

max. peak)

50 g±

5 g(±

500 gm

ax. peak)50 g

±5 g (±

500 g max. peak)

†Bias units in these sizes available in the fourth quarter 2004‡W

eight on bit§Lost circulation m

aterial

DR_04_038_0 ©Schlumberger

February 2004 *Mark of Schlumberger

Produced by Oilfield Marketing Communications, Houston.

www.slb.com/oilfield