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Artificial Lift UtilizingArtificial Lift UtilizingCT as a Hollow Sucker RodCT as a Hollow Sucker Rod

Humberto F. Leniek

COIL TUBING AMERICAS

Dr. William C. Maurer

MAURER ENGINEERING INC.

Engineering Inc.

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Stekoll Slimhole Pumping System (1960)

Flow Line

Rubber Hose

1” Tee

Clamp

Polished Rod Liner

2 7/8” Casing

1” EUE Pumping String

Traveling Barrel Insert Pump

Slip-Type Hold-Downwith Rubber RemovedScreen

Blind Cage

Gas Vent

ConventionalStuffing Box

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Stekoll Field Well (1960)

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STEKOLL Field Experience (1960)

• Over 1,000 Wells • 3,000 to 5,000 Foot Wells• 1” EUE Tubing (Hollow Sucker Rod)• 2-1/2” & 2-7/8” Inch Casing• 70 BOPD• 40 to 50% Reduction in Tubular Costs• 17% Overall Cost Savings

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STEKOLL Slimhole Wells (1960)

• Bolton Field, Kansas (1,000 ft) - 1,000 Wells

• Corsicana, Texas (1,200 ft) - 300 Wells• Panhandle, Texas (3,000 ft) - 20 Wells• Canada (5,000 ft) - 15 Wells

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STEKOLL Slimhole Operations (2-7/8”)

• Drilling & Logging• Perforating & Squeeze Cementing• Acidizing & Fracturing• Fishing & Washovers• Sand Bailing• Dual Completions

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Hollow Sucker Rod Advantage

“The hollow sucker rod combines the function of the sucker rod and the tubing, so it is no longer necessary to pull both sucker rods and tubing when working over wells.”

STEKOLL, 1960

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STEKOLL System Limitations (1960)

• Limited Slimhole Logging Tools• Workover Concerns• Tubing Failures• Resistance to Slimholes• Resistance to New Technology

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Leniek Pumping System (1999)

Production Line

1-1/2” Hydraulic Hose

Clamp

Hollow Polish Rod

2-7/8” or 3-1/2” Casing (CT or Tubing)

1-1/2” Coiled Tubing

Hollow Rod Pump

AnchorScreen

Gas Vent

Stuffing Box

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Leniek CT Pumping System

• Conventional Surface Equipment• 1,000 to 5,000 Feet• 2-7/8” or 3-1/2” Casing (CT or

Tubing)• 1-1/2” CT (Hollow Sucker Rod)• Hollow Polish Rod• Hollow Rod Pump

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LeniekSurface Equipment

(1999)

LubricatedStuffing Box

HollowPolish Rod

DynamometerHolder

Bridel

Polish RodClamp

1-1/2” Hydraulic Hose

ProductionLine

“U” Tube

HydraulicConnector

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Hollow Rod Pump

Screen

AnchorPerforations

1-1/2 Coiled Tubing

2-7/8” or 3-1/2” Casing(CT or Tubing)

GasGas

Oil

Oil

Leniek Bottomhole Assembly

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Coiled Tubing

Hollow Pull Rod

Pump Plunger

Traveling Valve

Standing Valve

Hollow RodConventional

Pump Barrel

Pump Barrel

Pull Rod

Tubing

Pump Plunger

Traveling Valve

ConventionalSeating Nipple

Standing Valve

Pump Barrel

Sucker Rod Pumps

Anchor

Tubing

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Leniek System Advantages

• Reduce Well Construction Cost 50 Percent• Eliminates Tubing Thread Failures• Eliminates Tubing Anchors• Reduce Lifting Costs• Reduce Paraffin Problems• Reduce Casing Wear• Treat Wells Through CT• Eliminate Rod Failures• Allows Ultraslim Holes

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Initial Concerns

• CT Fatigue Failures

• CT Buckling• CT Wear• Casing Wear

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Argentina YPF Test(1998-1999)

• San Jorge Basin• 2,600 Foot Well• 60 BPD• 2-7/8” Casing (Tubing)• 1-1/2” CT• 13 Months (No Failures)

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YPF Test

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YPF Test

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YPF Test

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Project Name:Well Name:CT OD (in):CT Wall Thickness (in):Casing Pipe OD (in):Casing Pipe Weight (lb/ft):CT Yield Strength (psi):CT Weld Reduction Factor:Stress Concentration Factor:Fatigue Strength Coefficient:Pumping Fluid Density (ppg):CT Job Corrosion Factor:Stroke Rate (stk/min):Pumping Stroke Length (in):CT Length (ft):

CTPSXYZ

1.5000.13403.5009.380

10000011

1250008.33

1674

6000

Coiled Tubing PumpingCoiled Tubing PumpingFatigue ModelFatigue Model CT Length (ft)

100012071414162118282034224124482655286230693276348336903897410343104517472449315138534555525759596661726379658667937000

Years to Failure>30>30>30>30>30>30>30>30>30>30>30>30>30>30>30>30>30>30>30>30>30>30>30>30>30>20>107.614.642.87

Acceptable

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CT Fatigue Life vs Stroke RateCT Fatigue Life vs Stroke Rate

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Leniek Potential Applications

• Marginal Oilfields• Shallow Wells• Low Production Wells (<300 BOPD)• Close Well Spacing• In Fill Drilling• Drill New Wells With Smaller Drilling

Rigs

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Leniek Marketing Options

• Start Service Company• Form Alliances with Service Companies• License Patent Rights to Service Company• Sell Territorial Rights to Operators• Form Partnership With Major Independent• Drill Slimholes Free For Oil Participation• Purchase Shallow Fields and Become

Operator

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Installation & Workover Requirements

• CT Rig• New CT• Good Supervision

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Future Requirements

• CT Centralizers• Low Cost CT Pulling Units• Trained Personnel• Industry Acceptance• Service Company Supplier

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Project Name:Well Name:CT OD (in):CT Wall Thickness (in):Casing Pipe OD (in):Casing Pipe Weight (lb/ft):CT Yield Strength (psi):CT Weld Reduction Factor:Stress Concentration Factor:Fatigue Strength Coefficient:Pumping Fluid Density (ppg):CT Job Corrosion Factor:Stroke Rate (stk/min):Pumping Stroke Length (in):CT Length (ft):

CTPSXYZ

1.5000.13402.8755.05980000

11

1050008.33

1674

4000

Coiled Tubing PumpingCoiled Tubing PumpingFatigue ModelFatigue Model CT Length (ft)

100012071414162118282034224124482655286230693276348336903897410343104517472449315138534555525759596661726379658667937000

Years to Failure>30>30>30>30>30>30>30>30>30>30>30>30>30>30>20>106.663.822.251.350.830.520.330.220.140.090.060.040.030.02

Acceptable

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Project Name:Well Name:CT OD (in):CT Wall Thickness (in):Casing Pipe OD (in):Casing Pipe Weight (lb/ft):CT Yield Strength (psi):CT Weld Reduction Factor:Stress Concentration Factor:Fatigue Strength Coefficient:Pumping Fluid Density (ppg):CT Job Corrosion Factor:Stroke Rate (stk/min):Pumping Stroke Length (in):CT Length (ft):

CTPSXYZ

1.5000.13403.5009.38080000

11

1050008.33

1674

4000

Coiled Tubing PumpingCoiled Tubing PumpingFatigue ModelFatigue Model CT Length (ft)

100012071414162118282034224124482655286230693276348336903897410343104517472449315138534555525759596661726379658667937000

Years to Failure>30>30>30>30>30>30>30>30>30>30>30>30>108.554.482.431.350.780.460.270.170.110.070.040.030.020.010.010.010.00

Unacceptable

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Project Name:Well Name:CT OD (in):CT Wall Thickness (in):Casing Pipe OD (in):Casing Pipe Weight (lb/ft):CT Yield Strength (psi):CT Weld Reduction Factor:Stress Concentration Factor:Fatigue Strength Coefficient:Pumping Fluid Density (ppg):CT Job Corrosion Factor:Stroke Rate (stk/min):Pumping Stroke Length (in):CT Length (ft):

CTPSXYZ

1.5000.13403.5009.38090000

11

1150008.33

1674

4000

Coiled Tubing PumpingCoiled Tubing PumpingFatigue ModelFatigue Model CT Length (ft)

100012071414162118282034224124482655286230693276348336903897410343104517472449315138534555525759596661726379658667937000

Years to Failure>30>30>30>30>30>30>30>30>30>30>30>30>30>30>30>30>30>20>108.534.882.851.701.030.640.400.260.170.110.07

Acceptable

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Project Name:Well Name:CT OD (in):CT Wall Thickness (in):Casing Pipe OD (in):Casing Pipe Weight (lb/ft):CT Yield Strength (psi):CT Weld Reduction Factor:Stress Concentration Factor:Fatigue Strength Coefficient:Pumping Fluid Density (ppg):CT Job Corrosion Factor:Stroke Rate (stk/min):Pumping Stroke Length (in):CT Length (ft):

CTPSXYZ

1.7500.15605.50014.500100000

11

1250008.33

1474

6000

Coiled Tubing PumpingCoiled Tubing PumpingFatigue ModelFatigue Model CT Length (ft)

100012071414162118282034224124482655286230693276348336903897410343104517472449315138534555525759596661726379658667937000

Years to Failure>30>30>30>30>30>30>30>30>30>30>30>30>30>30>30>30>30>107.703.882.011.070.580.330.190.110.060.040.020.01

Unacceptable

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Project Name:Well Name:CT OD (in):CT Wall Thickness (in):Casing Pipe OD (in):Casing Pipe Weight (lb/ft):CT Yield Strength (psi):CT Weld Reduction Factor:Stress Concentration Factor:Fatigue Strength Coefficient:Pumping Fluid Density (ppg):CT Job Corrosion Factor:Stroke Rate (stk/min):Pumping Stroke Length (in):CT Length (ft):

CTPSXYZ

1.7500.15605.50014.500100000

11

1250008.33

1674

4000

Coiled Tubing PumpingCoiled Tubing PumpingFatigue ModelFatigue Model CT Length (ft)

100012071414162118282034224124482655286230693276348336903897410343104517472449315138534555525759596661726379658667937000

Years to Failure>30>30>30>30>30>30>30>30>30>30>30>30>30>30>30>30>107.573.701.870.970.520.280.160.090.050.030.020.010.01

Acceptable

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Conventional Stuffing Box

Production Tee

2-7/8” J-55 Non Upset SeamlessTubing Set As Casing

Flexible RubberHose to Oil

Lead Line

HollowPolish Rod

Gas Vent

1” J-55 External Upset SeamlessTubing Used as Sucker Rods

1” J-55 External Upset SeamlessTubing Used as Sucker Rods

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Elbow

HoseFastConnector

Hollowpolished rod

Stuffing box

Pressurerelief or

chemical inlet

Surfacecasing

Ground level

Perforations

Pump seatPump

Tubing anchor

1-1/2 Coiled tubing

2-7/8 Tubing

5-1/2 Casing

Productionline

Checkvalve

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Sucker Rod Pump in Horizontal Well

100-200 ft.

Pump (30O inclination)

Pump Jack

Oil

Pump (90O inclination)