DEA-150-Slips

7/29/2019 DEA-150-Slips

http://slidepdf.com/reader/full/dea-150-slips 1/28

Diminished Drillpipe CapacityDiminished Drillpipe Capacity

Due to Slip CrushingDue to Slip Crushing

Drilling Engineering Association (DEA) A Research Operations Forum

7/29/2019 DEA-150-Slips


What We KnowWhat We Know

z

Reaching (Exceeding?) Limits – Materials

– Equipment

7/29/2019 DEA-150-Slips


W. ReinholdW. Reinhold

WH SpiriWH Spiri(World Oil, Oct. 1959)(World Oil, Oct. 1959)

7/29/2019 DEA-150-Slips


Hydraulic SlipsHydraulic Slips

z

Hydraulic ControlledSlips

7/29/2019 DEA-150-Slips


Conventional SlipsConventional Slips

z

Conventional Drop in3 Man Slips

z Modified to enhance

integrity at high loads

7/29/2019 DEA-150-Slips


Strain Gage PlacementStrain Gage Placement

z

Strain Gages Placed atCritical Load/Stress

Points on Modified

Conventional Slips

7/29/2019 DEA-150-Slips


Wedding CakeWedding Cake

z

ID Measuring Systemz 3 sensors at 120°

phase separation

7/29/2019 DEA-150-Slips


1.6 MM Pound Load Frame1.6 MM Pound Load Frame

z

Sample Loaded inLoad Frame

7/29/2019 DEA-150-Slips


ResultsResults

z

DimensionalLocations

z Strain Gage Locations

z Evaluate Shape andDiameters Before and

After Testing

7/29/2019 DEA-150-Slips


ResultsResults

z

Slip Die Bite Marks atToe of Slips

7/29/2019 DEA-150-Slips


Landing StringsLanding StringsOD ID PPF WALL

5 3.574 32.67 0.7135 3.500 34.01 0.750

5 1/2 4.000 38.01 0.750

5 7/8 4.375 41.05 0.7506 5/8 5.625 32.67 0.500

6 5/8 5.581 34.01 0.522

6 5/8 5.375 40.00 0.6256 5/8 5.345 40.90 0.640

6 5/8 5.125 47.05 0.750

6 5/8 4.999 50.46 0.813

6.906 5.000 60.59 0.953

7/29/2019 DEA-150-Slips


New 6 5/8 DrillpipeNew 6 5/8 Drillpipe

z

Hexagonal IDz Mill Process

7/29/2019 DEA-150-Slips


Neck down of ODNeck down of OD

z

OD Deformationz Midway up the toe of

the slips

7/29/2019 DEA-150-Slips


NeckdownNeckdown of Drillpipeof Drillpipe

z

As Weight is HungOff Plastic

Deformation Occurs

7/29/2019 DEA-150-Slips


Change in Internal Diameter by Load CycleChange in Internal Diameter by Load Cycle

-0.80%

-0.70%

-0.60%

-0.50%

-0.40%

-0.30%

-0.20%

-0.10%

0.00%

850 900 1000 1050 1100 1150 1250 1300 1350 1400

Load Cycle Maximum (kips)

% C

h a n g e i n I D

7/29/2019 DEA-150-Slips


Cumulative Change in Internal Diameter Cumulative Change in Internal Diameter

-4.00%

-3.50%

-3.00%

-2.50%

-2.00%

-1.50%

-1.00%

-0.50%

0.00%

800 850 900 950 1000 1050 1100 1150 1200 1250 1300 1350 1400 1450Load (kips)

%

C h a n g e i n

I D

DRIFT

7/29/2019 DEA-150-Slips


What We ThinkWhat We Think

z

This problem should not be ignoredz If the string needs to be held for a length of

time, plastic deformation will cause the

drillpipe to neckdown just below the slips

z The reduction in area will eventually

weaken the drillpipe causing the pipe to part just below the slips

7/29/2019 DEA-150-Slips


What Needs to be DoneWhat Needs to be Done

z

Comprehensive Studies to Better Define – Material Degradation

– Material Limits

– Equipment Operating Limits

z Test validity of Spiri-Reinhold Equation

z

Possible solutions – Mitigate Risks

– Improve Cost Effectiveness

7/29/2019 DEA-150-Slips


How?How?

z

Develop a study protocol that does not havethe objective of qualifying a product

z Strain Gage OD and ID of Drill Pipe

– ID Problematic

z Precise, Repetitive, and Accurate Placement

– Technically Difficult

7/29/2019 DEA-150-Slips


Establish Control ValuesEstablish Control Values

z

Limit Scope – Limit variables

– Establish baseline values

z Determine generic damage to drill pipe

7/29/2019 DEA-150-Slips


Limit Initial StudyLimit Initial Study

66--12 Months12 Months

z

1 pipe vendor – Before tool joint

z 10 foot lengths

– 5”

– 5 ½”

– 6 5/8”

7/29/2019 DEA-150-Slips


z

2 Slip Styles – Narrow Column Inserts

– Wide Column Inserts

7/29/2019 DEA-150-Slips


z

New Solid Bowl inside new bushing – Establish control values

– Split bowls more popular

z Less consistent

z More variance

7/29/2019 DEA-150-Slips


Future EffortsFuture Efforts – – Phase IIPhase II

z

Determine correlation between laboratoryconditions vs rig conditions

7/29/2019 DEA-150-Slips


Future EffortsFuture Efforts – – Phase IIIPhase III

z 1 Drill Pipe vs Split Bowl vs Bushing

– Split Bowl vs Bushing Condition Matrix

z New x New

z New x Mid API Spec

z New x Max API Spec

z Mid API Spec x New

z Max API Spec x New

z Mid API Spec x Mid API Spec

z Mid API Spec x Max API Spec

z Etc.

7/29/2019 DEA-150-Slips


Future EffortsFuture Efforts – – Phase IVPhase IV

z

Establish Realistic Range – Coefficient of Friction

z Water Base Mud vs Oil Base Mud

– Insert Die and Slip Body – Slip Body and Bowl

z Define Critical Damage to Drill Pipe

– Inspection Criteria

z Effect of Instantaneous Loading

7/29/2019 DEA-150-Slips


Projected CostProjected Cost – – Phase IPhase I

Lab and Engineering 100,000$Drill Pipe 20,000$

Slips and Bowls Rental 10,000$Bushing Rental 10,000$

TOTAL 140,000$

7/29/2019 DEA-150-Slips


Safe and TroubleSafe and Trouble--free Operationsfree Operations

Documents

DEA-150-Slips