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Weatherford International Ltd.

515 Post Oak Blvd., Suite 600

Houston, Texas 77027 USATel: 713-693-4000

weatherford.com© 2008 Weatherford. All rights reserved. 180.04

Dailey® R-A-M ® Shock Absorber

Drilling Tools

The• Dailey R-A-M shockabsorberisentirelymechanical.Drillingorhydraulicuids,

which could leak and cause downhole pressure to drop, are not required.

Theshockabsorbercanberunintensionorincompressionforoperationalexibility.•

Theshockabsorberworksimmediately,withoutpreloading,foroperationalefciency.•Drive rollers minimize friction on the reciprocating motion of the shock absorber to•reduce wear and prolong the life of the tool.

Special rubber elements provide high vibration reduction capability.•

Features, Advantages and Benefts

All drilling operations•

High-temperature applications (up to 400°F/204°C)•

Applications

Weatherford’s patented Dailey R-A-M shockabsorberisatime-provenrstlineof

defense against excessive drill-bit wear and drillstring damage caused by string shock

andvibration.Theprimarybenetofshockabsorptionistheallowanceofoptimal

weight and rotary speeds while drilling, which translates to increased penetration

rates and lower drilling costs per foot.

Incorporatingtheeld-provenRoll-A-Maticroller/splinedrivemechanism,theshock

absorber uses drive rollers that ride almost friction free in the splined mandrel as drillingweight is attained. The rollers transfer torque from the rotary table, through the barrel,

directlytothebit.Astackedcolumnofuidandtemperature-resistantrubberelements

absorbsvibrationwhileoatingpistonsequalizeinternalandexternalpressure.A

unique linear motion bushing reduces mandrel wear, increases stabilization, and

virtually eliminates hole deviation.

The Dailey R-A-M shock absorber activates immediately and is not limited by

drillingweight,torque,typeofdrillinguid,orowrates.Itcanbemodiedforhigh-

temperature applications. The shock absorber performs best if placed as close to the

drill bit as possible; but, with its unique design, it can be run anywhere in the drillstring.

180.04_Dailey RAM Shock Absorber-A4.indd 1 9/9/2008 9:46:46 AM

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Drilling Tools






Specifcations

OD (in./mm)6-1/2

165.10

8

203.20

9

228.60

9-1/2

241.30

11

279.40

ID (in./mm)2

50.80

2-1/4

57.15

2-1/2

63.50

2-3/4

69.85

Tool joint size (API), top4-1/2 IF

6-5/8Reg. 7-5/8Reg.

4-1/2 XH

Tool joint size (API), bottom 4-1/2Reg. 6-5/8Reg. 7-5/8Reg.

Tensile yield

(lbf/kN )1

179,000

796

598,000

703

1,700,000

7,562

1,046,000

4,653

Torsional yield

(lbf-ft/kN•m)

35,000

47.5

115,000

155.9

168,000

227.8

364,000

493.5

Length (ft/m)12.5

3.8

14.0

4.3

14.5

4.4

18.0

5.5

15.0

4.6

Weight (lb/kg )1,030

467

2,000

907

2,400

1,089

4,000

1,814

4,025

1,826

Hole size range (in./mm)7-7/8 to 8-3/4

200.0 to 222.3

8-1/2 to 12-1/4

215.9 to 311.2

9-5/8 to 14-3/4

244.5 to 374.7

12-1/4 to 17-1/2

311.2 to 444.5

14-3/4 to 26

374.7 to 660.4

Dynamic spring rate2

(x 1,000 lbf/in., N/mm)

63

11

90

16

110

19

Maximum weight on bit

(x 1,000 lbf/1,000 N )

65

289

90

400

110

489

130

578

Lateral defection ratio3 1.24:1 1.21:1 1.18:1 1.14:1

Maximum bottomhole

temperature (°F/°C )

400

204

Pump-open area (in.2 /cm2 )12.57

81.1

14.19

91.6

19.63

126.6

17.70

114.2

27.11

174.9

1TensileandtorsionalyieldvaluesarecalculatedperAPIRP7G,basedonnominaldimensionsandpublishedyieldstrengthofmaterial,anddonotconstituteaguarantee,actual

or implied.2Dynamic spring rate values are based on calculations.3ThesevaluesrepresenttheratioofdeectionoftheshockabsorbertoadrillcollarofthesameOD,ID,andlengthundercomparableloadingconditions.


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Drilling Tools






Pump-Open Forces Chart

0

11-in. OD279.40-mm OD

9-in. OD228.60-mm OD

9 1/2-in. OD241.30-mm OD

8-in. OD203.20-mm OD

6 1/2-in. OD165.10-mm OD

0

522

65289

70311

75334

90400

85378

80356

P u m p - O p e n F o r c e s ( 1 , 0

0 0 l b f / k N )

Differential Pressure (psi/bar )

400

28

800

55

1,200

83

1,600

110

2,000

138

2,400

165

2,800

193

1044

1567

2089

25111

30133

35156

40178

45200

50222

55245

60267


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Drilling Tools





Weatherford products and services are subject to the Company’s standard terms and conditions, availableon request or at weatherford.com. For more information contact an authorized Weatherford representative.Unlessnotedotherwise,trademarksandservicemarkshereinarethepropertyofWeatherford.Specicationsare subject to change without notice. Weatherford sells its products and services in accordance with theterms and conditions set forth in the applicable contract between Weatherford and the client.


The• Dailey R-A-M shockabsorbercanbemodiedforhigh-temperatureapplications.

Take the following steps each trip out of the hole:

Wash the mud from the polished mandrel and from inside the bottom connection.1.

Checkthepolishedmandrelcarefullyforanysignsofcorrosion,pitting,orakingof2.

the coating.

Options

Maintenance


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