Agitator Tool Handbook Rev02, Q3 2010

7/25/2019 Agitator Tool Handbook Rev02, Q3 2010

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AgitatorTool Handbook

Agita

torToo

lHandb

ook


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AGITATOR

1. Introduction ...................................................................2

1.1 Drilling ............................................................2

1.2 Intervention and Coiled Tubing .........................3

2. How It Works ................................................................ 4

Planning the Job ...............................................................8

3.1 Operating Parameters ......................................8

3.2 Drilling/Completion Fluids ................................8

3.3 MWD ...............................................................8

4. Applications ..................................................................9

4.1 Drilling Applications .........................................9

4.2 Non-Drilling Applications .................................94.3 Optimization Service .......................................9

5. Drilling Procedures (Jointed Pipe) ..............................10

5.1 Surface Testing .............................................10

5.2 Testing with MWD Systems ...........................125.3 Advice While Drilling ......................................13

5.4 Tool Storage and Handling .............................14

6. Trouble Shooting ........................................................15

6.1 Tool Operation ...............................................15

7. Specifications ............................................................18

7.1 Agitator Specifications ...................................18

7.2 Power Sections

Specifications and Guidelines.........................35

7.3 Dog Leg Severity (DLS) .................................39

7.4 Shock Tool Selection .....................................39

Contents

The information contained within this handbook is believed

to be accurate and is based upon run histories and empirical

data. However, NOV makes no warranties or representations

to that effect. All information is furnished in good faith, and

the use of this information is entirely at the risk of the user.

1


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1.1 Drilling

The Agitator gently oscillates the BHA or drillstring tosubstantially reduce friction. This means improved weight

transfer and reduced stick-slip in all modes of drilling, butespecially when oriented drilling with a steerable motor. Aswell profiles become more tortuous and the limits of extendedreach boundaries are explored, the Agitator provides a simplemeans of expanding the operating window of conventionalsteerable motor assemblies.

Smooth weight transfer and exceptional tool face control isnow possible with PDC bits, even in significantly depletedformations after large azimuth changes. Extended intervalscan be achieved and the lack of requirement to work the BHA- to obtain and maintain tool face - provides significant ROP

improvements.The Agitator is compatible with all MWD systems andprovides a viable means of extending long reach targets whileimproving ROP, reducing rock bit runs and minimizing thechance of differential sticking.

MWD/LWD Compatibility

Does not damage MWD tools or corrupt signals

Reduces lateral and torsional vibration

Run above or below MWD

No impact force to bit or tubulars

Bit Friendly

Can be used with rock bit or fixed cutter bits

No impact forces to damage teeth or bearings

Extends PDC life through controlled weighttransfer; no spudding

Directional Enhancement

Prevents weight stacking and allows excellenttool face control

Provides means of sliding at increased ROP and lowerweight off hook

Allows weight transfer with less drill pipe compression

1. Introduction

2


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Fig. 1

AGITATOR

The Agitator allows steerable motors to expandthe boundaries of extended reach drilling, andenhances their efficiency in less complexapplications.

1.2 Intervention and Coiled Tubing

Friction also plagues intervention work. TheAgitator has been used to convey memory

logs, perforating guns and to slide stuck tubingsleeves at the end of tortuous completionstrings. It has also proven beneficial in runningliners and in the retrieval of stuck assemblies.

Note

Please contact NOV for up to dateinformation.

3


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2. How it Works

Power Section

Shock Tool

The Agitator system relies on three main mechanisms:

1. Power section

2. Valve and bearing section

3. Excitation section:

Running on jointed pipe = use a shock toolRunning on coiled tubing = coiled tubing does the

shock tools job

Valve & Bearing

Section

Fig. 2

4


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AGITATOR

P

(psi)

t (sec)

1. Valve moves to one extremityTFA minimized = pressure peak

P= pressure drop across

valve plates

t= time

t (sec)

P

(psi)

2. Valve moves to center

TFA maximized = pressure trough

P

(psi)

t (sec)

3. Valve moves to other extremityTFA minimized = pressure peak

Fig. 3. Relative positions of valve plates

The power section drives the valve section producing pressure

pulses which in turn activate the shock tool or act on the coiled

tubing. It is the axial motion of the shock tool or coiled tubing

which breaks static friction.

The unique valve system is the heart of the tool; it converts the

energy available from the pumped fluid into a series of pressure

fluctuations (pressure pulses). This is done by creating cyclical

restrictions through the use of a pair of valve plates. The valve

opens and closes with the result that the total flow area (TFA) ofthe tool cycles from maximum to minimum.

At minimum TFA, the pressure is high and at maximum TFA, the

pressure is low.(See Fig. 3)

5


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The frequency of these pressure pulses is directionally

proportional to the flow rate. Refer to the tool specifications to

see the frequency/flow rate relationship for each tool size. The

size of the valve plates is configured based on operational

parameters to optimize performance and ensure that thepressure drop is always within specification.

The Agitator itself only creates pressure pulses. In order to

transform this hydraulic energy into a useful mechanical

force in jointed pipe operations, a shock tool is placed abovethe Agitator tool in the BHA or drill string as in Fig 2. In coiled

tubing operations only the Agitator is required; the coiled

tubing expands and contracts as the pressure pulses act

on it.

The shock tool contains a sealed mandrel which is springloaded axially, (see Fig. 4). When internal pressure is applied

to the shock tool the mandrel will extend due to pressure

acting on the sealing area (also known as the pump open

area) within the tool. If the pressure is removed, the springs

return the mandrel to its original position. When used directlyabove the Agitator, the pressure pulses cause the shock tool

to extend and retract, thus producing an axial oscillation. The

Agitator system may be positioned anywhere in the drillstring to

focus energy where it will be most effective.

Agitator System - Overview

The Agitator Systemconsists of a power section which

drives a valve

The valve

creates pressure pulses. Their frequency isdirectly proportional to the flow rate

Shock Tool: A shock tool converts pressure pulses into

axial movement (in coiled tubing applications a shock tool

is not required)

How It Works

6


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Seal Area

Springs

AGITATOR

Fig. 4 Shock Tool

7


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3. Planning The Job3.1 Operating Parameters

Customers are requested to complete a simple Agitator pre-

job check sheet to ensure that the tool is set-up correctly,

including:

Flow rate

Fluid weight and type (See section 3.2)

Pressure drop available to the Agitator

Downhole temperature

Inclination and azimuth Drilling/intervention plan and/or well type

Planned BHA configuration

The valve plates will be selected based upon flow rate, fluid

weight and pressure drop available to the Agitator. The flowrate and mud weight ranges should be kept as accurate as

possible to aid best tool set-up. Hydraulics software is used

to aid tool set-up and produce an operating chart for the job.

3.2 Drilling/Completion Fluids

Drilling/completion fluids information is required to ensure that

the power section elastomer and the rotor will be compatible

with the operating environment:

Brand and manufacturer

Type/composition

Chlorides concentration

PH level

Mud oil/water ratio (%)

MSDS sheets for all completion fluids and additivesDownhole operating temperatures will also influence choice

of power section.

3.3 MWDThe Agitator is compatible with all MWD systems. Pre-job

planning is advised to avoid any problems at the rig site,

however. Where the MWD frequency can be altered please

contact NOV for advice. Also see Section 7.1 for Agitator

frequency information.

8


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AGITATOR

4.1 Drilling Applications

Applications and tool positioning:

Above motor, below MWD

Above motor and MWDVertical rotary assembly

Andergauge adjustable stabilizer assembly

Up hole on drill pipe (See 4.3 Optimization Service)

Dual Agitator assembly (See 4.3 Optimization Service)

TTRD

Coiled Tubing drilling

4.2 Non-Drilling Applications

Coiled Tubing Intervention:

- Extended reach

- Stimulation

- Manipulation

- Scale/fill removal- Logging

Fishing

Running liners

Cementing

4.3 Optimization Service

If provided with full well information, NOV can provide an

optimization service to ensure that the placement of the

Agitator is optimized for jointed pipe operations.

Torque and drag analysis

Determine effective friction factors

4. Applications

9


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AGITATOR

Fig. 5. Agitator

11

Pressure Drop

Shock Tool

Pulses act on

pump open seal area

Pulse generatedat operating frequency

Pulses converted to

axial displacement

Agitator

Power Section

Valve & Bearing Section


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Drilling Procedures5.2 Testing with MWD Systems

Check with the MWD Field Engineers whether they will

be testing just to see pulses (Pulse Only Test), a more

comprehensive test (Full MWD Test), or if they will test the

MWD 656 984 ft (200 300 m) downhole (Shallow Hole

MWD Testing).

Pulse Only Test (at Surface)

This can be done with the Agitator in the BHA.Test the flow rate required by the MWD (this should be

more than sufficient to activate the Agitator system).

There will be easily recognizable oscillations in the

BHA. If the shock tool is visible, there will be an obvious8

-a

(310 mm) axial movement.

Full MWD Test (at Surface)

NOV recommends testing the Agitator separately from the

MWD string. Once the test has been successfully completed,

the Agitator can then be picked up and tested.Bring the pumps up steadily until vibrations can be felt, or

movement seen in the shock-tool. There is no need to pump

at full drilling rate for the Agitator test. As soon as vibrations

are seen, the test is successful and the pumps can be turned

off.

Shallow Hole MWD Testing

Where an MWD test is to be done at a depth of typically 656

984 ft (200 300 m), NOV recommends the Agitator and

motor are tested at surface, as above. The MWD string can

then be picked up and run into the hole for a normal test.

There is no minimum duration for testing if vibration is

seen, then the test is good.Additional confirmation can be seen on the MWD Operators

pulse detection screen.

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5.4 Tool Storage and Handling

Cold Climate Storage Guidelines

Stators should be stored in an environment above 32F

(0C). Short duration below freezing will be unavoidable whentransporting to the field or on stand-by but long term storage

should be above 32F (0C). Assembled tools should not

be stored in temperatures below 14F (-10C) for periods

exceeding one week.

Hot Climate Storage Guidelines

Stators should not be stored in direct sunlight. Cover tools

with a tarp if stored outdoors.

Post-Job Handling

Flush tool with clean water first then apply a soapy solution,

e.g. washing-up liquid. The Agitators power section cannot be

rotated by external force; hang tool vertically (pin connection

down); pour solution in the top (box connection) and allow

to filter down through the power section. Alternatively, pumpfresh water though the tool.

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AGITATOR

6. Trouble Shooting

Section through

a 1:2 PDM

Section through

a 5:6 PDM

Fig. 6

15

6.1 Tool Operation

Recognizing How the Tool is Working

If the Agitator is under-performing then the following factors

should be considered: Mud weight and flow rate vs. planned: Check these

parameters against the operating chart.

BHA position reposition the Agitator or add a second

tool (See 4.3 Optimization Service)

Temperature and mud type: actual vs. planned

Hours in hole

LCM pumped Agitator has same capabilities as a

drilling motor.

Elastomer Over Shakers

More than likely to be the drilling motor. The Agitator power

section is not required to generate torque therefore is less

stressed and less likely to fail. The Agitator power section is

a 1:2 lobe style section whereas most motors are multilobe.(See Fig. 6) Therefore close observation of the elastomer

pieces should reveal whether it is the Agitator or a multilobe

molding.


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Frequency Fig. 7

0.31

0.25

0.19

0.12

0.06

Amplitude

Example MWD Trace

0.0 5.0 10.0 15.0 20.0 25.0

Trouble Shooting

16

Using the MWD Oscilloscope to Monitor Agitator Frequency

The Agitators frequency can be monitored on the MWD

oscilloscope (See Fig 7). Normally a spike will be apparent

at the Agitators operating frequency which verifies tool

operation. Fig.7 shows spike at approx. 17 Hz.

The operating frequency can vary by up to 2Hz from tool to

tool so do not be alarmed if the frequency is not exactly as

calculated. Changes in temperature can also affect the tool

frequency.

Signal Loss

The Agitator will still be operating even if a signal reduction

or loss is experienced. This is not unusual, and only if

accompanied by a large pressure change should there be

cause for concern. Signal loss is likely to be caused by: Harmonics

Attenuation

Often the signal will return through time/depth if caused by

harmonics. If down due to attenuation then the signal will

generally decrease with depth (See Fig 8).


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Frequency Fig. 8

Amplitude

0.31

0.25

0.19

0.12

0.06

0.0 5.0 10.0 15.0 20.0 25.0

Example MWD Trace

AGITATOR

17

The MWD software and hardware set-up itself will affect the

oscilloscope display. Check the following when comparing

signals:

Axis scale and units

HarmonicsFilters


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ToolSize(OD)

3w

4w

(HighFlow

)

5

(HighTORQU

E)

62

6w

8

9s

Ov

erallLength

122ft

8wft

8wft

6ft

9ft

11ft

12ft

Weight

240lbs

310lbs

498lbs

900lbs

1,0

00lbs

1,600

lbs

2,0

00lbs

Re

commendedFlowRan

ge

90-140gpm

150-270gpm

250-330gpm

150-270gpm

250-330gpm

375-475gpm

400-600gpm

500-1,0

00gpm

600-1100gpm

TempRange*

302F(150C)

302F(150C)

302F(150C)

302F(150C)

302F(150C)302F(150C)

302F(150C)

Op

eratingfrequency

26Hz@1

20gpm

18-19Hz@250

gpm

16-17Hz@250

gpm

16-17Hz@2

50

gpm

15Hz@4

00gpm

16-17Hz@

500gpm

16Hz

@9

00gpm

12-13Hz

@9

00gpm

Op

erationalPressuredro

p

ge

nerated

500-700psi

550-650psi

550-650psi

600-700psi

600-700psi

600-800psi

600-800

psi

MaxPull

230,000lbs*depe

nding

onserviceconnection

260,0

00lbs

500,0

00lbs

570,0

00lbs

570,0

00lbs

930,0

00lbs

1,1

45,00

0lbs

Co

nnections

2a

IF,

2d

IF

2d

AMOH,2d

REG

pin/box

32

IFpin/box

4

GRANTPRIDECO

XT39pin/box

42

XH,

4IF

pin/boxorNC46

pin/box

42

IF

pin/box

6s

REGpin/box

orNC

-56pin/box

7s

REG

boxup

7s

REG

pindown

or6sR

EGpin

down

AGITATOR

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L

C

A

B

D

K

Z

J

I

X

X

H

G

E

F

Dim Description In mm Dim Description In mm

A 28Agitator 72.90 1852 H Bottom Sub 1.00 25

B Top Sub Length 7.90 201 I Top Sub 1.25 32

C Stator Length 57.00 1448 J Top Sub 1.45 37

DBottom SubLength

8.00 203 K Stator I.D. 1.75 44

E Top Sub 2.12 54 L Rotor 44.30 1125

F Stator 2.12 54 X 12AMMT Connection

G Bottom Sub 2.12 54 Z

1.82010-3G Stub ACME

Thread

20

Specifications28Agitator Assembly


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L

C

A

B

D

K

Z

J

I

X

X

H

G

E

F


A 2aAgitator 72.90 1852 H Bottom Sub 1.00 25

B Top Sub Length 7.90 201 I Top Sub 1.25 32

C Stator Length 57.00 1448 J Top Sub 1.45 37

DBottom SubLength

8.00 203 K Stator I.D. 1.75 44

E Top Sub 2.38 60 L Rotor 46.56 1183

F Stator 2.38 60 X 12AMMT Connection

G Bottom Sub 2.38 60 Z1.82010-3G Stub ACMEThread

AGITATOR

21

2aAgitator Assembly


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Specifications


A 2dAgitator 69.00 1753 I Top Sub 1.25 32

B Top Sub Length 8.00 203 J Top Sub 2.06 527

C Stator Length 53.00 1346 K Stator I.D. 2.44 624

D Bottom SubLength

8.00 203 L Rotor 44.35 1126

E Top Sub 2.88 73 M Rotor OD 1.10 28

F Stator 2.88 73 X 2aPAC-DSI Connection

G Bottom Sub 2.88 73 YSub ID Restricted from0.550to 0.90

H Bottom Sub 1.25 32 Z 2.5508-3G Stub ACME Thread

22

2dAgitator Assembly

L

D

C

A

B

M

Y

Z

X

X

I

J

K

Z

H

G

F

E


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A 2dAgitator 85.60 2174 I Top Sub 1.25 32


C Stator Length 70.00 1778 K Stator I.D. 2.44 62

D Bottom SubLength

7.60 193 L Rotor 61.20 1554

E Top Sub 2.88 73 M Rotor OD 1.12 28

F Stator 2.88 73 X 2aPAC-DSI Connection

G Bottom Sub 2.88 73 YSub ID Restricted from0.60and 0.90

H Bottom Sub 1.25 32 Z 2.550Stub ACME Thread

AGITATOR

23

2dAgitator Assembly(HF)

L

X

Z

Y

D

C

A

B

M

Z

H

G

F

I

X E

J

K

Z


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A 3aAgitator 77.05 1957 I Stator 2.75 70

B Top Sub 15.75 400 J Bottom Sub 1.586 40

C Stator 48.00 1219 K Bottom Sub 1.50 38

D Bottom Sub 13.30 338 L Rotor 39.00 990

E Top Sub 3.50 89 X 2dReg Pin Connection

F Stator 3.38 86 Y 2dReg Box - -

G Bottom Sub 3.50 89 Z 2.875 8-3G Stub ACME

H Top Sub 1.60 41

AGITATOR

3aAgitator Assembly

25

3aAgitator Assembly with 2dREG Connection

Y

H

X

I

K

G

J

C

A

B

D

L

M

Z

E


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A 3wAgitator 151 3835 K Top Sub ID 1.50 38B Top Sub Length 51.30 1303 L Top Sub ID 2.13 54

C Stator Length 49.60 1260 M Stator ID 2.75 70

DBottom SubLength

51.00 1296 N Rotor Length 38.98 990

E Top Sub OD 4.00 102 O Rotor OD 1.12 29

F Top Sub OD 3.75 95 P Top Sub FishingNeck

12.00 305

G Stator OD 3.75 95 X See above table

H Bottom Sub OD 3.75 95 YSub ID Restricted between0.725and 0.875

I Bottom Sub OD 4.00 102 Z Modified PAC Connection

J Bottom Sub ID 1.50 38

Connection Option

X

2aIF2dIF

2dAMOH

2dREG

AGITATOR

3wAgitator Assembly

C

A

B

D

N

H

G

F

EX

K

O

Y

Z

ZML

J

I

X

27


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31/42


A 5Agitator 134.14 3407 J Bottom Sub ID 2.00 51

B Top Sub Length 31.50 800 K Top Sub ID 2.25 57

C Stator Length 68 1727 L Top Sub ID 2.75 70

D Bottom Sub 34.64 880 M Stator ID 3.84 98

E Top Sub OD 5.00 127 N Rotor Length 54.07 1373

F Flex Profile OD 4.00 102 O Rotor OD 1.64 42

G Stator OD 5.00 127 X XT 39 Connections

H Flex Profile OD 4.00 102 YSub ID Restrictedfrom 1.00to 1.35

I Bottom Sub OD 5.00 127 Z 4.3- 4 TPI Tapered ACME Thread

AGITATOR

29

5Agitator Assembly

M

ON

D

C

A

B

X

ZY

E

Z

X

K

L

F

G

H

I

J


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A 62Agitator 180.88 4594 J Bottom Sub ID 2.50 64

B Top Sub Length 51.08 1297 K Top Sub ID 2.50 64

C Stator Length 83.00 2108 L Top Sub ID 2.50 64

D Bottom Sub 46.80 1189 M Stator ID 5.00 127

E Top Sub OD 6.50 165 N Rotor Length 64.00 1628

F Flex Profile OD 4.77 121 O Rotor OD 2.30 58.4

G Stator OD 6.50 165 X XT 39 Connections

H Flex Profile OD 4.77 121 YSub ID Restrictedfrom 1.30to 1.70

I Bottom Sub OD 6.50 165 Z

Service Connection (mod pac

- 1.5 TPF

30

62Agitator Assembly

Specifications

M

ON

D

C

A

B

X

Z

Y

E

Z

X

K

L

F

G

H

IJ


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L

D

C

A

B

K

I

X

ZJ

M

H

F

E

G

X

Z

Y


A 6wAgitator 113.0 2870 I Top Sub 2.81 71


C Stator Length 72.00 1829 K Stator ID 5.57 141

D Bottom Sub 22.50 572 L Rotor 57 1448

E Top Sub OD 6.75 171 M Rotor OD 2.57 65

F Stator OD 6.75 171 X 42IF Connection

G Bottom Sub 6.75 171 YSub ID Restrictedfrom 1.00to 1.35

H Bottom Sub 2.50 64 Z4.3- 4 TPI Tapered ACME

Thread

AGITATOR

31

6wAgitator Assembly


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C

A

D

B

L

X

M

X

I

F

E

G

KZ

J

H

Y

Z


A 9sAgitator 145.30 3690 I Top Sub See above table


C Stator Length 90.00 2240 K Stator ID 7.85 199

D Bottom Sub 27.80 706 L Rotor 70.60 1793E Top Sub OD See above table M Rotor OD 4.09 104

F Stator OD 9.62 244 XTop &Bottom Sub

See above table

G Bottom Sub See above table YSub ID Restrictedfrom 2.00to 2.50

H Bottom Sub See above table Z

8.500- Modified

ACME Thread

X O.D I.D

6sREG 8.00 3.50

7sREG 9.62 3.00

Connection Details

AGITATOR

33

9sAgitator Assembly


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38

Other factors to consider:

Elastomer Swelling

Aerated Fluids

Explosive Decompression

Particulate Content

High temperatures will cause elastomer swelling. Undersize

rotors must be fitted in a high temperature environment.

See selection guideline graph for general rotor choice

guidelines. Note that muds known to cause swelling (low

aniline point), coupled to a high temperature, may require

extra swelling allowance and/or a special elastomer.

The Agitator will have reduced efficiency in aerated fluids

due to the compressible nature of gas. Care should also

be taken when running the tool in low liquid content to

reduce the wear of the power section and components.

Lubrication should be added to reduce friction. Thiswill extend life of all components. Lubricants should be

thoroughly mixed with water and injected into the drilling

medium at a rate of no less than 5% of the drilling medium

volume.

Aerated drilling fluids can cause over speeding of thepower section which will increase temperature and could

lead to premature failure. Ensure sufficient lubricant is

added. Generally fluids with >75% liquid content should

not cause a problem. Note: the Agitator power section

cannot be slowed down by applying WOB as per a drillingmotor, since it has no drive output (bit box). The motor

may be controlled in such applications but separate

consideration must be given to the Agitator.

Explosive decompression of the elastomer can be an

issue in aerated fluids; ensure float equipment is installed

in the string below the tool in such environments. When

explosive decompression is known to be a problem do

not run the tool again.

As the particulate content increases, erosion becomes

a problem with elastomers and other components. The

particulates should be limited to 2%.

Specifications


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AGITATOR

Rotor/Mud Compatibility Rules

The rotor coating material must be compatible with the

fluid. Failure to ensure this could lead to rotor damage, in

turn leading to stator elastomer damage. The standard rotorcoating material is chrome. Environments known to be

incompatible with chrome are:

Chloride content

Very low/high phDo not run chrome plated rotors if the level is 11 pH.

For use in such environments uncoated stainless steel rotors

or a tungsten carbide type coating is recommended.

Best practice is to properly flush the tool regardless of mud

type.

7.3 Dog Leg Severity (DLS)

Please contact NOV for specific advice.

7.4 Shock Tool Selection

NOV will recommend a shock tool which has been carefully

selected and assessed to ensure good performance. Not allshock tools are compatible with the Agitator.

39

When the drilling fluid contains a chloride concentration

over 30,000 ppm (30,000 mg/l) the tool must be properly

flushed and serviced as soon as possible.

Do not run chrome plated rotors in chloride concentrations

of > 100,000 ppm (100,000 mg/l).


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Agitator Tool Handbook Rev02, Q3 2010

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Transcript of Agitator Tool Handbook Rev02, Q3 2010