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HYBRID WORKSTRING FEATURING TUBING DIMENSIONS WITH DRILL PIPE DURABILITY AND STRENGTH

FSS-247
Rugged Workstring Design

Patent US 11,505,999 B2

New workstring design giving more versatility when drilling out frac plugs.

Robust thread profile gives higher torsional strength allowing greater performance on wellbore cleanouts.

4.5 turns for makeup.

  • Engineered for drilling out frac plugs
  • Metal to Metal seal
  • Tested to 22,500 psi at 40deg/100ft bend radius
  • Extended lengths upsets allow multiple recuts
Flow-Data-FSS-247 Chart.pdf

Frac String Performance Characteristics Sheet 

Pipe Size and Weight:
Pipe Grade:
Range:
Connection:

2 3/8 5.95 IEU
S135
2
3.062 x 1.805 FSS-247®

Frac String Pipe Body

New-APIPremium
OD (in)2.3752.273
Wall Thickness (in)0.2540.203
ID (in)1.8671.867
Calculated Plain End Weights (lbs/ft)5.7514.491
Note: Premium properties are calculated based on uniform OD and wall thickness.
Cross sectional area pipe body (in2)1.6921.322
Cross sectional area OD (in2)4.4304.059
Cross sectional area ID (in2)2.7382.738
Section Modulus (in3)0.8130.629
Polar Section Modulus (in3)1.6261.258
New-APIPremium
Torsional Strength (ft-lbs)10,6008,200
Tensile Strength (lbs)228,500178,400
Pressure Capacity (psi)25,26623,101
Collapse Capacity (psi)25,78821,976

Connection

FSS-247®
OD (in)3.062
ID (in)1.805
Drift (in)1.773
*Frac String with a Material Yield Strength of 135000 psi
Pin Tong length (in)6
Box Tong length (in)9
Thread CompoundNCS-30
Friction Factor1.15
Torsional Strength (ft-lbs)8,800
Severe Service Level Recommended Make-up Torque (ft-lbs) (75%)6,600
Standard Service Level Recommended Make-up Torque (ft-lbs) (60%)5,300
Min Recommended Make-up Torque (ft-lbs)4,400
Operational Torque Must Not Exceed Mark-up Torque
Balance OD (in)3.050
Tensile Strength (lbs)230,200
Connection Compressive Strength (lbs)234,900
Min OD for Tension and Compression (in)2.843
Stretch K value0.21730

Frac String Properties

API Adjusted Weight (kg/m)(lbs/ft)9.596.44
Make up loss (mm)(in)702.75
Approximate Length (M)(ft)9.6031.5
Working Pressure (kPa)(psi)10342115,000
Fluid Displacement (CuM/M)(gal/ft)0.001220.099
Fluid Capacity (CuM/M)(gal/ft)0.001710.137
Drift Size (mm)(in)45.031.773

Frac String Bend Radius

These calculations are based on new pipe with nominal wall
Based on Bending Stress (psi) at Pipe OD15,000
Radius of Curvature ( R ) (ft) (@ OD of pipe)197.9
BUR (dogleg) deg/100 ft29

Frac String Connection 4.5x13.5 lb

NameIDID AreaODSleeve DriftAnnular AreaAnnular/ID RatioID/Annular RatioFPS Down Tube @ 25 BPMFPS Down Annulus @ 5 BPMMax Torque
2-7/8, 7.90, S135 FSS-26523.14163.253.72.456378%128%107277,200
2-3/8, 5.95, S135 FSS-2471.8052.55883.0623.7003.3883132%76%132206,600
2-3/8, 5.95, P110 Two Step1.8052.55882.9063.7004.1195161%62%132163,400
2-7/8, 7.90, P110, Two Step2.2654.02933.4383.7001.468836%274%84464,400

Frac String Connection 4.5x11.6 lb

NameIDID AreaODSleeve DriftAnnular AreaAnnular/ID RatioID/Annular RatioFPS Down Tube @ 25 BPMFPS Down Annulus @ 5 BPMMax Torque
2-7/8, 7.90, S135 FSS-26523.14163.253.8753.4975111%90%107197,200
2-3/8, 5.95, S135 FSS-2471.8052.55883.0623.8754.4295173%58%132156,600
2-3/8, 5.95, P110 Two Step1.8052.55882.9063.8755.1607202%50%132133,400
2-7/8, 7.90, P110, Two Step2.2654.02933.4383.8752.510062%161%84274,400

FSS-247 Working Parameters

With max MUT of6,600Ft-Lbs
The max tensile load* =131,847Lbs
With recommended MUT of5,300Ft-Lbs
The max tensile load* =148,860Lbs
Working Pressure15,000psi
Test Pressure22,500psi
NCS-30 thread compound required
*Tensile load including pressure end load
Combined Loading Chart
For FSS-247 3.062 X 1.805 Tool Joint with a Material Strength of 135000 psi, using a Coefficient of Friction of 0.08, NCS30 Thread Compound and a Safety Factor of 1.0. On Pipe: 2.375 5.95 S135 Premium Class.
TorqueTension
Applied to StringMake Up Torque using NCS30 with FF of 1.15Limits of Combined Loading on the FSS-247 ConnectionLimit with Torque Applied to StringMAKEUP TORQUE
1.15Pin YieldShoulder Separation
Ft-LbsPound
250300225,6780178,410
500600225,67810,870178,327
750900225,67821,740178,075
1,0001,200225,67832,610177,656
1,2501,400225,67843,480177,067
1,5001,700225,67854,350176,307
1,7502,000225,67865,220175,373
2,0002,300225,67876,090174,263
2,2502,600225,67886,960172,974
2,5002,900225,67897,830171,501
2,7503,200225,678108,700169,839
3,0003,500225,678119,570167,984
3,2503,700225,678130,440165,928
3,5004,000225,678141,310163,664
3,7504,300225,678152,180161,183
3,8004,400225,678163,050158,475MINIMUM
4,0004,600225,678163,050158,475
4,2504,900225,678173,920155,528
4,5005,200225,678184,790152,329
4,6005,300225,678195,660148,860RECOMMENDED
4,7505,500225,678195,660148,860
5,0005,800225,678206,530145,103
5,2506,000225,678217,400141,035
5,4006,200220,198220,198136,627
5,5006,300220,198220,198136,627
5,7506,600197,213197,213131,847MAXIMUM
6,0006,900174,227174,227126,651
6,2507,200151,242151,242120,985
6,5007,500128,257128,257114,782
6,7507,800105,272105,272107,947
7,0008,10082,28782,287100,353
7,2508,30059,30259,30291,810
7,5008,60036,31736,31782,022

TORQUE TENSION COMBINED LOAD CURVE

For FSS-247 3.062 X 1.805 Drill Pipe with a Material Strength of 135000 psi, using a Coefficient of Friction of 0.08, NCS30 Thread Compound (FF 1.15) and a Safety Factor of 1.0. On Pipe: 2.375 5.95# S135 Premium Class.
TORQUE TENSION COMBINED LOAD CURVE

FSS-247® 3.062 X 1.805 CONNECTION OD WEAR CURVE

FSS-247® 3.062 X 1.805 CONNECTION OD WEAR CURVE
THIS TECHNICAL INFORMATION IS FOR REFERENCE ONLY