Agitator Brochure

8/21/2019 Agitator Brochure

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AGITATOR™ TOOL



2000

1800

1600

1400

1200

1000

Without Agitator

Footage Drilled

With Agitator

22

20

18

16

14

12

10

Without Agitator

Average ROP

With Agitator

National Oilwell Varco Downhole offers the most comprehensive

range of proven friction reduction tools for Drilling, Completions,

and Intervention Services.

DRILLING, COMPLETION, AND INTERVENTION CHALLENGES

• Holding Tool Face while drilling

• Poor ROP while drilling

• Stick Slip

• Drag on Drillstring while sliding

• Sinusoidal and Helical buckling with coiled tubing

• Lock up on coiled tubing prior to TD of service

SOLUTIONS

The Agitator tool has provided unparalleled downhole friction

reduction technology for far longer than any other tool in the industry.

The Agitator has been used for various applications including:

• Directional drilling

• Coiled tubing operations

• Wellbore intervention

• Fishing

The assembly’s unique ability to reduce friction is achieved by

creating pressure pulses which act on a shock tool above it to gently

oscillate the drillstring.

BENEFITS

• Better weight on bit control

- Prevents weight stacking

- Improved ROP

- Longer PDC bit life

- Drill plugs more effectively

• Improved toolface control

- Reduced reactive torque and spudding events

- More time drilling, less time orienting

• Extended reach drilling capability due to reduced friction

• Improved production – intervene in longer lateral length wells

• Delays Sinusoidal and Helical Buckling in coiled tubing

• Improves any application where friction is a limiting factor

The Agitator tool is compatible with all MWD systems. The oscillations

are low magnitude and they occur only in the longitudinal axis of

the drillstring. The Agitator does not cause harmful lateral vibrations

detrimental to the life of downhole tools.

PROVEN PERFORMANCE

The Agitator has improved Drilling, Completion, and Inter vention

Services in thousands of runs all over the world.

CASE HISTORY

NOV Agitator Tool Run with a 6¾” DSR516M-B1 improves drilling

performance through lateral section of Haynesville Shale. (Operator

and well name Confidential), De Soto, Parish, LA . USA

RESULTS

• 36.4% Longer footage

• 22.5% Overall ROP increase

• Excellent bit dull

Agitator™ Tool



0 2500 5000 7500 10000 12500 15000 17500

Depth ft

Total Depth Achieved with Agitator

Additional Depth With Agitator

Depth Achieved

Depth Without Agitator

Coiled Tubing Milling Application Permian Basin / West Texas

• 2d” Milling BHA on 1¾” coiled tubing

• Agitator System used after initial lock up with init ial BHA, to reduce friction on coil and allow the CT to reach TD without lockup

BACKGROUND

Well was approached and originally entered with a conventional CT Milling BHA. Upon original attempt three composite plugs were milled and lock

up was seen at 13,100 feet. Two plugs remained in the well at a maximum depth of 15,400 feet.

WELL INFORMATION

• Location: West Texas / Permian Basin

• Horizontal well with max depth of 15,400 feet

• 5½” - 23 lb casing

• BHA Configuration – 2d” Connector, Dual Check Valve, NOV Jar, Disconnect, Circ-Sub, CT Agitator, In-line Filter, 2d” CT Motor, 4.5” Mill

OBJECTIVE

• Overcome buckling and prevent lock up with the Coiled Tubing

• Mill out the last two plugs and reach TD

RESULTS

Addition of the Agitator System immediately reduced the level of weight stacking, providing an additional 2,300 feet of reach and allowing the Coiled

Tubing BHA to mill out the remaining two composite plugs and reach TD.

CONCLUSION

The addition of the Agitator System provided a substantial reduction in coil/borehole friction and allowed the Service Provider to reach TD with Coiled

Tubing.



FISHING WITH THE AGITATOR™ SYSTEMPROVEN PERFORMANCE IN FISHING OPERATIONS

FISHING APPLICATIONS:

• Bottom-Hole Assemblies (BHAs)

• Casing Pulling

• Stuck Casing

• Gravel Packed Sand Screens

• Electri c Submersible Pumps

• and more…



Tool Size (OD)

Overall Length

with Shock Tool

Weight

with Shock Tool

Flow Range*

Max

Temperature**

Operating

Frequency

Operational

Pressure Drop

Generated***

Max Pull to

Yield Agitator/

Shock Tool

Max Pull for

Agitation

Max Weight for

Agitation

4-3/4” (High Flow)

17.25 ft.

825 lbs

150-270 gpm

(250-330 gpm)

320°F

160°C

18-19 Hz @ 250 gpm

(16-17 Hz @ 250 gpm)

700 psi

260,000 lbs

29,000 lbs

74,000 lbs

5” (High Flow)

17.25 ft.

920 lbs

150-270 gpm

(250-330 gpm)

320°F

160°C

18-19 Hz @ 250 gpm

(16-17 Hz @ 250 gpm)

700 psi

360,000 lbs

29,000 lbs

74,000 lbs

6-1/2”

15.4 ft.

1,700 lbs

375-475 gpm

320°F

160°C

15 Hz @ 400 gpm

700 psi

570,000 lbs

61,250 lbs

100,000 lbs

6-3/4”

18.4 ft.

1,850 lbs

400-600 gpm

320°F

160°C

16-17 Hz @ 500 gpm

700 psi

570,000 lbs

61,250 lbs

100,000 lbs

8”

Series 148 = 18.4 ft

Series 160 = 21.5 ft

2,500 lbs

500-1,000 gpm

320°F

160°C

16-17 Hz @ 900 gpm

700 psi

Series 148 = 770,000 lbs

Series 160 = 872,000 lbs

Series 148 = 61,250 lbs

Series 160 = 54,250 lbs

Series 148 = 125,000 lbs

Series 160 = 125,000 lbs

9-5/8”

21.8 ft.

4,200 lbs

600-1,100 gpm

320°F

160°C

12-13 Hz @ 900 gpm

700 psi

1,145,000 lbs

82,500 lbs

100,000 lbs

The Agitator™ System

The Agitator™ System is composed of two tools:

• Agitator™ Tool – generates pressure pulses

• Griffith™ Shock Tool – converts pressure pulses into axial motion

As part of the Fishing BHA, the Agitator System generates an axial oscillating motion

(cyclical tension) to help free the stuck object. This oscillating motion is activated by

circulation of the wellbore fluid: as the wellbore fluid is circulated, the Agitator tool

generates a pressure pulse wave. This pressure wave enters the shock tool and acts on

the piston area within the tool, stroking the shock tool. This axial (along the pipe, not

side-to-side) oscillating motion is transmitted through the catch tool to the stuck object,

helping to vibrate it loose.

Features:

• Easily integrated into Fishing BHA

• Can be used with standard NOV fishing equipment: Catch Tools, Jar, Intensifier™,

Bumper Sub, Safety Joint, etc.

• Available at most NOV service locations worldwide

* NOV Engineering can provide recommendation for flow rate to maximize loosening effect on the stuck object.

** Higher temperature ratings are available upon request.

*** Actual operational pressure drop will depend on flow rate. This can be estimated in pre-job planning.



0

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

11000

-500 500 1500 2500

Well Profile

743ft BHA/Fish

D e p t h

( f t )

Reach (ft)

Well Diagram according to Survey Data

Fishing of stuck pipe – Drilling BHAs, cleanout assemblies, etc.

Challenge:

• Stuck BHAs are a costly problem, causing significant NPT (Non-Productive Time)

• Expensive Lost-In-Hole charges and the additional costs of cementing and sidetracking

• Differential sticking / mechanical sticking / pack-offs / stuck in cuttings

• Challenging well profiles

Solution:

The Agitator System has been used successfully in dozens of f ishing jobs with a high rate of

success, even in applications where conventional fishing attempts over several days had been

unsuccessful. The system is proven to greatly increase the likelihood of BHA retrieval in

difficult conditions.

Note: the Agitator System can also be used while drilling, to prevent differential

sticking/pack-offs/stuck in cuttings.

Benets:

• Gentle oscillation of stuck BHA reduces friction

• Improves overpull transfer from surface

• Turns static sticking into dynamic sticking

• Increases sliding ROP in drilling applications • Improves toolface control & reduces Stick-slip

• Extends step-out capability

• Significantly improves directional control

4 ¾” Fishing Agitator and Bowen

Super Fishing Jar recover RSS

Directional BHA in highly deviated

6 1/8” hole in 1 hour, after being stuck for 12.7 days Success in Saudi Arabia, Q4 2011

Fishing BHA used:

5-3/4” OVERSHOT + 4-3/4” BUMPER SUB + 4-3/4” SUPER FISHING JAR + 3 x 4-3/4”DC

+ 4-3/4” INTENSIFIER + 1 x 4-3/4”DC + 4-3/4” AGITATOR SYSTEM + 2 x 4-3/4” DC + 3 x 4”HWDP

Fishing BHA arrangement will vary based on the application – contact NOV for pre-job planning



Interval (m)

2670 - 2705

2720 - 2735

2735 - 2755

2771 - 2807

2823 - 2843

2843 - 2851

2858 - 2869

2879 - 2890

Length (m)

35

15

20

36

20

8.5

11

11

Overpull Without

Agitator (ton)

250

250

90

250

255

255

255

250

Overpull With

Agitator (ton)

150

149

90

140

240

240

235

250

Jarring

2

3

2

27

3

5

4

Comments

Conventional attempts unsuccessful to pull casing. Agitator System employed and casing was

successfully retrieved

Conventional overpull and jarring unsuccessful. Agitator System used successfully to pull casing

Pulled casing with conventional overpull and jarring, however got stuck on the way out and then

used the Agitator System to successfully free casing






Casing Pulling – Plug & Abandon, Slot Retrieval, Stuck Casing

Challenge:

• Significant cost savings can be realized by retrieving casing from P&A wells

• Conventional overpull and jarring has limited effectiveness in retrieving casing

Solution:

The Agitator System has been used successfully in dozens of casing pulling runs, in various

sizes. The Agitator System in integrated into the Casing Retrieval BHA, incorporating a

circulating sub to allow circulation above the spear and packoff assembly. The Agitator System

has also been used at surface, to retrieve casing which became differentially stuck while

being run into the drilled wellbore.

Success with 9 5/8” Casing Pulling - StatoilHydro, Norway, Q1 2012:

“StatoilHydro had a very positive experience from the use of the Agitator System on

Gullfaks B. The verification came after the first trial when pulling and jarring had shown

no progress. The Agitator System was then operated and the fish came free. The Agitator

System was thereafter included in all the following pulling operations in B-14A.”

Lead Drilling Engineer, StatoilHydro



Jar Freqency – 1 blow/minute

Time and Impact are shown on different scales on each chart for visual clarity

Agitator Frequency – 1200 blows/minute (e.g. at 20 Hz)

Time (s)

I m p a c t ( l b s )

Time (s)

I m p a c t ( l b s )

The Agitator™ System provides an incredibly effective new patented capability to free objects

stuck downhole, such as drilling BHAs, cleanout assemblies, casing, liners, electricsubmersible pumps, and gravel packed sand screens.

Conventional fishing BHA’s and fishing techniques to recover lost BHA’s or other stuck

objects downhole are generally limited to either applying overpull or jarring to free the object.

When added to the Fishing BHA, the Agitator System provides an additional loosening

action which can greatly improve the likelihood of retrieving the stuck object: Axial

oscillating motion.

This functionality is complementary to the Fishing Jar, and both are used in the process of

freeing the stuck object. Whereas jarring generates a large single impact force, the Agitator

System generates a smaller force, but at a much higher frequency. By inducing an

oscillating motion in the stuck object, it loosens the contact with the formation and helps

to literally “wiggle it free.”

Reference Technical Papers:

• SPE 99415

• IADC/SPE 151096

• SPE-163516-MS

• SPE-SAS-372

• IBP2059_12

Benets:

• Significantly increase the rate of success for retrieval of stuck objects

• Reduce rig Non-Productive Time (NPT)

• Eliminate need for expensive cementing & sidetracking operations

• Recovery of BHA strings, casing, gravel packed sand screens, submersible pumps, etc.

• Reduce Lost-In-Hole costs

• Make other downhole operations possible, by retrieving stuck objects

Documents

Agitator Brochure