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HYBRID WORKSTRING FEATURING TUBING DIMENSIONS WITH DRILL PIPE DURABILITY AND STRENGTH

FSS-338
Rugged Workstring Design

Patent US 11,505,999 B2

New workstring design with smaller OD connection giving more versatility when used for refracking existing wells.

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

6.5 turns for makeup.

  • Engineered for 5 ½ casing applications
  • Metal to Metal seal
  • Tested to 22,500 psi at 40deg/100ft bend radius
  • Extended lengths upsets allow multiple recuts

Frac String Performance Characteristics Sheet 

Pipe Size and Weight:
Pipe grade:
Range:
Connection:

3 1/2 12.95 IEU
S135
2
4.125 x 2.562 FSS-338

Frac String Pipe Body

New-APIPremium
Wall Thickness (in)0.3750.300
ID (in)2.7502.750
Calculated Plain End Weights (lbs/ft)12.5109.768
Note: Premium properties are calculated based on uniform OD and will thickness.
Cross sectional area pipe body (in2)3.6822.875
Cross sectional area OD (in2)9.6218.814
Cross sectional area ID (in2)5.9405.940
Section Modulus (in3)2.6052.015
Polar Section Modulus (in3)5.2104.030
Torsional Strength (ft-lbs)33,80026,200
Tensile Strength (lbs)497,000388,100
80% Torsional Strength (ft-lbs)27,00021,000
Pressure Capacity (psi)25,31323,143
Collapse Capacity (psi)25,82922,014

Connection

FSS-338
Pin Tong length (in)5
Box Tong length (in)7
Friction Factor
1.15
Torsional Strength (ft-lbs)18,81021,632
Severe Service Level Recommended Make-up Torque (ft-lbs) (70%)13.20015,100
Standard Service Level Recommended Make-up Torque (ft-lbs) (60%)11,30013,000
Min Recommended Make-up Torque (ft-lbs)9,400
Balance OD (in)4.106
Tensile Strength (lbs)422,600
Min OD for Tension (in)3.906

Frac String Properties

API Adjusted Weight (kg/m)(lbs/ft)19.7913.30
Approximate Length (M)(ft)9.7532.00
Working Pressure15,000
Fluid Displacement (CuM/M)(gal/ft)0.002530.203
Fluid Capacity (CuM/M)(gal/ft)0.003760.303
Drift Size (mm)(in)63.502.500

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)291.7
BUR (dogleg) deg/100ft19.6
BUR(dogleg) deg/100 M64.5
FSS-338 Data Charts.pdf

Frac String Connection 5.5x23 lb

NameIDID AreaODDriftAnnular AreaAnnular/ID RatioID/Annular RatioFPS Down Tube @ 26 BPMFPS Down Annulus @ 5 BPMMax Torque
3-1/2, 12.95, S135 FSS-3382.5625.15524.1254.5452.859955%180%682415,100
2-7/8, 7.90, P110 Two Step2.2654.02933.4384.5456.9407172%58%87104,400

Frac String Connection 5.5x20 lb

NameIDID AreaODDriftAnnular AreaAnnular/ID RatioID/Annular RatioFPS Down Tube @ 26 BPMFPS Down Annulus @ 5 BPMMax Torque
3-1/2, 12.95, S135 FSS-3382.5625.15524.1254.6533.640271%142%681915,100
2-7/8, 7.90, P110 Two Step2.2654.02933.4384.6537.7209192%52%8794,400

Frac String Connection 5.5x26 lb

NameIDID AreaODDriftAnnular AreaAnnular/ID RatioID/Annular RatioFPS Down Tube @ 26 BPMFPS Down Annulus @ 5 BPMMax Torque
3-1/2, 12.95, S135 FSS-3382.5625.15524.1254.4232.000639%258%683415,100
3-1/2, 12.95, S135 FSS-3292.5004.908744.4232.798357%175%712413,400
2-7/8, 7.90, P110 Two Step2.2654.02933.4384.4236.0814151%66%87114,400
2-7/8, 10.40, S135, PTECH28+23.14163.6254.4235.0441161%62%1121312,200

FSS-338 Working Parameters

With max MUT of15,000Ft-Lbs
The max tensile load* =260,000Lbs
With recommended MUT of13,000Ft-Lbs
The max tensile load* =412,000Lbs
Working Pressure15,000psi
Test Pressure22,500psi
NCS-30 thread compound required
*Tensile load including pressure end load
THIS TECHNICAL INFORMATION IS FOR REFERENCE ONLY