Impact Tools DPA Rio

7/30/2019 Impact Tools DPA Rio

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Jarring is a method for dynamically transferring strain

energy from the drill string above the jar to the stuck

point below the jar.

Jars are used to free stuck pipe by generating an

amplified force at the stuck point using the energy from

the force applied at surface.

What is Jarring?

Types of Jars

Drilling Jars

Hydra-Jar

Drilling Accelerators

Fishing Jar

TMC Tools

Fishing accelerators

TT Jars


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Drilling Jars

Hydra-Jar AP

Double Acting Hydraulic Drilling Jar.

Double detent system

Fishing Jars

TMC Jars

Single acting hydraulic jars.

Single detent system.

Only up jarring blows.


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TT Jars

Used in Thru-Tubing Operations

Double Acting Hydraulic

Single Detent System

Jar Anatomy

Lower Sub

Lower Detent Cylinder

Connector Sub

Neutralizer Cylinder

Drive Cylinder

DPRS

Fluid Cylinder

Connector Sub

Service Plug

Fill Plug

Fill Plug

Kelly Mandrel

Grease

Oil


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Energy source.

Delay mechanism.

Accelerate the mass.

Impact / Impulse.

Shock wave propagation.

How does a jar works?

Inputs / Outputs

Inputs

Energy source

Delay mechanism

Acceleration of mass

Outputs

Impact

Impulse


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Input: Energy Source

=

Input: Delay Mechanism

Detent System

Allow time for pipe to stretch (PE)

Sudden release of (KE)

Metering Pin for

Temperature Compensation


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The jar contains a detent mechanism that restricts the

movement of an internal piston, This restriction allows the

drill pipe to stretch and store energy.

When the detent is complete, the piston is allowed to travel

freely from the time it is released to the time it impacts on

the anvil.

Input: Acceleration of Mass

Detent Mechanism


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The energy travels to the stuck point via stress waves, eachwave releases a certain amount of energy peaks, which

creates a tensile force that attempts to put the stuck point

into motion.

Impact: largest peak of energy transferred to the stuck point.

Impulse: total amount of energy transferred to the stuckpoint divided by the total time of the wave travel.

Output

Hammer Mass

Less Hammer = More Impact.

More hammer = More Impulse.

Optimal Hammer Mass

10% to 20% of maximum jar load.

Impact and Impulse Optimization


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Less Hammer = More Impact Less mass more acceleration

Therefore greater impact

Shorter hammer shorter duration of stress wave travel time

Therefore less impulse

More Hammer = More Impulse

More mass less acceleration

Therefore decreased impact

Longer hammer longer duration of stress wave travel time

Therefore more impulse

Impact and Impulse

Impact and Impulse

17

Pipe to surfaceImpulse DecreasesImpact Increases

J

ARJ

A

R

Minimum mass10% of overpull

Impulse Increases

Impact Decreases

Maximum mass20% of overpullFixed length

A BStuck point


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Accelerator AP

An accelerator AP tool is one that amplifies the final impact and

impulse energy released by a jar.

The accelerator AP tool allows the strain energy that is normally

stored by the drill pipe to be stored within the accelerator AP tool

and released closer to the stuck point, resulting in a more

efficient transfer of energy.

Creates a more effective reflecting point.

Stop damaging shock waves from reaching the rig floor bycreating a close jarring loop.

Accelerator Tool Design

Consists of outer cylinder and

inner mandrel connected by a

piston chamber

When forced is applied

Silicon liquid is compressed

by moving piston

When force is released

Silicon liquid expands (like

a spring) moving the piston

back


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Accelerator performance


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Dimensions.

Temperature compensation system.

Pressure balance compensation.

Special features

Dimensions

Tool OD 4 6 8

Tool ID 2 2 3

Max

Overpull 80,000 lb 175,000 lb 300,000 lb

Up Stroke 8 8 8

Down

Stroke7 7 7


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Temperature compensation system

100 F 500 F

Meter pin

Pressure Balance system

Neutralizer Pistons

Hydrostatic Pressure

Balanced Pressure


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Drilling jar & Accelerator placement options

Option # 1: Single jar placement

If working on a vertical well, it is recommended to place

the jar in tension.

If working in a deviated well, it is recommended to place

the jar in the vertical section.

If placed in the horizontal section there is a greater

risk of not being able to overcome the hole drag.

If the stuck point occurs in the curve section the

drilling jar will be useless.

Down size of placing the jar in the vertical section is

that the impact might not be hard enough.


Option # 2: Single jar placement with an accelerator

Same considerations mentioned on the previous slide

apply.

The accelerator enhances the performance of the hydra jar

by storing and releasing strain energy closer to the drilling

jar.

The hydra jar and accelerator tool combination can provide

up to 250% increase in impact forces transmitted to the

stuck point


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Option # 3: Dual jar placement

The top drilling jar will give good impacts in the curve

and help to cock the lower drilling jar, the lower drilling

jar will transmit high impacts to the horizontal section

of the hole.

Most experience shows that successful activation of

the lower drilling jar close to the stuck point resulted in

a high probability of freeing the BHA.Enough spacing between the two drilling jars (at least

1000 mts) must be run to avoid damaging the lower

drilling jar.

Jar situation:

Lower drilling jar is closed and in compression.

Upper drilling jar is open and in tension.

String becomes stuck with bit on bottom. Apply overpull load to lower drilling jar, if drilling jar fires then cock

the jar an continue jarring up.

If the jar does not fire, fire the upper drilling jar, for four times and

verify is the lower drilling jar is activated.

Procedure for dual string jars


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Option #4: Dual jar placement with an accelerator:

The upper drilling jar will provide greater forces for

activation of the lower drilling jar.

Impact if stuck above the horizontal section will

dramatically increase.

All the benefits mentioned in option #2 and option #3

apply.


Option #5: Dual jar and dual accelerator placement:

This would be the ultimate impact system for horizontal

wells.

If stuck in the horizontal section, the chances of gettingfree will increase dramatically.

All the benefits mentioned in option #2, option #3 and

option #4 apply.


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Jar-Pact Impact/PlacementAnalysis Program

JAR PACT

Jar-Pact is a proprietary software for placement and

impact analysis. This program is designed for

exclusive use of smith international personnel.


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BENEFITS OF USING JAR PACT

Jar Pact helps to optimize the placement of a jar and anaccelerator in the BHA.

The software allows us to visualize impact and impulsevalues generated for a given BHA.

Calculate the magnitude of the maximum impact and

impulse values when jarring up and down for threedifferent jar loads.


Calculates the placement of the neutral point.

Determines whether the jar is in tension or compression for a

given placement.

Indicate if the jar OD selected is suitable for the hole size.


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Generates a diagram showing the ODs, IDs, #/ft, of the entire

BHA.

Jar Pact gives a recommendation on the change out time.

REQUIRED INFORMATION

GENERALINFORMATION

WELL INFORMATION BHA INFORMATION

Company name Wellbore diameter ID and OD of each

component on the

BHA

Well name Mud weight Length of eachcomponent on the

BHA

Well location WOB Weight per foot of each

component

Name of person

requesting the

analysis

Surveys Diameter of the jar and

accelerator to be

used


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RULES TO REMEMBER

Jar in the transition zone.

Drill collars.

Hevi-Wate Drill Pipe.

In Tension.

In Compression.In the neutral point.

HWDP

Jar

Drill Collar

RULES TO REMEMBER


Drill Collars.


In Tension.

In Compression.

In the neutral point.

Drill Collar

Jar

Drill Collar


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RULES TO REMEMBER

HWDP

Jar

HWDP


Drill collars.


In Tension.

In Compression.


RULES TO REMEMBER


Drill collars.


In Tension.

In Compression.


JAR

HWDP

HWDP


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JAR IN TENSION

JAR IN TENSION

Neutral point below the jar

Jar will remain open and cocked to jar down

There is no risk of firing the jar when POOH

Recommended in wells with low inclination (less than15 )

RULES TO REMEMBER


Drill collars.


In Tension.

In Compression.


JAR

HWDP

Cerradocompletamente

HWDP


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JAR IN COMPRESSION

JAR IN COMPRESSION

Neutral point placed above the jar.

Jar remains closed and cocked to jar up.

The jar could fire accidentally if the drill string is

POOH too fast.

Inevitable in highly deviated wells where the BHA

below the jar does not supply enough WOB.

RULES TO REMEMBER


Drill collars.

Hevi-Wate Drill Pipe.In Tension.

In Compression.

In the neutral point.HWDP

JAR

HDWP

Cocked Position


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RULES TO REMEMBER

Never place the jar at the neutral point, leave at least a 90

gap between the jar and the neutral point

Never place the jar in a transition zone.

Never place the jar below an stabilizer, reamer or any other

component that has continuous contact with the well walls.

RULES TO REMEMBER

When short interval sticking is expected higher impact values are

recommended.

When long interval sticking is expected higher impulse values are

recommended.

Be cautious when placing Jar in BHA:

Too close to potential stuck point

Too far away hinders Jars abilities to free stuck pipe

Too much BHA in tension can accelerate fatigue in BHA


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JAR PACT RESULTS SHEETJAR PACT RESULTS SHEET

JAR PACT RESULTS SHEET


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THANK YOU

Documents

Impact Tools DPA Rio