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HYBRID WORKSTRING FEATURING TUBING DIMENSIONS WITH DRILL PIPE DURABILITY AND STRENGTH

FSS-265
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.

4.5 turns for makeup.

  • Engineered for 4 ½ casing applications
  • Metal to Metal seal
  • Tested to 22,500 psi at 40deg/100ft bend radius
  • Extended lengths upsets allow multiple recuts
FSS-265 Performance Characteristics

Frac String Performance Characteristics Sheet 

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

2 7/8 7.90 IEU
S135
2
3.250 x 2.0 FSS-265

Frac String Pipe Body

New-APIPremium
OD (in)2.8752.765
Wall Thickness (in)0.2760.221
ID (in)2.3232.323
Calculated Plain End Weights (lbs/ft)7.6575.996
Note: Premium properties are calculated based on uniform OD and wall thickness.
Cross sectional area pipe body (in2)2.2541.765
Cross sectional area OD (in2)6.4926.003
Cross sectional area ID (in2)4.2384.238
Section Modulus (in3)1.3391.040
Polar Section Modulus (in3)2.6772.081
New-APIPremium
Torsional Strength (ft-lbs)17,40013,500
Tensile Strength (lbs)304,200238,200
Pressure Capacity (psi)22,68020,736
Collapse Capacity (psi)23,43218,971

Connection

FSS-265
OD (in)3.250
ID (in)2.000
Drift (in)1.938
*Frac String with a Material Yield Strength of 135000 psi
Pin Tong length (in)6
Box Tong length (in)9
Thread CompoundNCS30
Friction Factor1.15
Torsional Strength (ft-lbs)10,300
Severe Service Level Recommended Make-up Torque (ft-lbs) (75%)7,800
Standard Service Level Recommended Make-up Torque (ft-lbs) (60%)6,200
Min Recommended Make-up Torque (ft-lbs)5,200
Operational Torque Must Not Exceed Make-up Torque
Balance OD (in)3.237
Tensile Strength (lbs)246,500
Connection Compressive Strength (lbs)266,400
Min OD for Tension and Compression (in)3.031
Stretch K value0.16856

Frac String Properties

API Adjusted Weight (kg/m)(lbs/ft)12.36 8.31
Make up loss (mm)(in)702.75
Approximate S/S Length (M)(ft)9.6131.5
Working Pressure (kPa)(psi)10342115,000
Fluid Displacement (CuM/M)(gal/ft)0.001580.127
Fluid Capacity (CuM/M)(gal/ft)0.002660.214
Drift Size (mm)(in)49.231.938

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)239.6
BUR (dogleg) deg/100 ft23.9

FSS in 4.5" x 13.5# casing:

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%107277,800
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

FSS in 4.5" x 11.6# casing:

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%107197,800
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-265 Working Parameters

With max MUT of7,800Ft-Lbs
The max tensile load* =207,439Lbs
With recommended MUT of6,200Ft-Lbs
The max tensile load* =218,344Lbs
Working Pressure15,000psi
Test Pressure22,500psi
NCS-30 thread compound required
*Tensile load including pressure end load
Combined Loading Chart
For FSS-265 3.250 X 2.000 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: 2.875, 7.90#, S135 Premium Class.
TorqueTension
Applied to StringMake Up Torque using NCS30 with FF of 1.15Limits of Combined Loading on the FSS-265 ConnectionApplied to StringMAKEUP TORQUE
1.15Pin YieldShoulder Separation
Ft-LbsPounds
300350241,68611,684238,154
600700241,68623,368237,978
9001,000241,68635,053237,684
1,2001,400241,68646,737237,271
1,5001,700241,68658,421236,739
1,8002,100241,68670,105236,088
2,1002,400241,68681,790235,316
2,4002,800241,68693,474234,422
2,7003,100241,686105,158233,405
3,0003,500241,686116,842232,262
3,3003,800241,686128,527230,993
3,6004,100241,686140,211229,595
3,9004,500241,686151,895228,065
4,2004,800241,686163,579226,402
4,5005,200241,686175,264224,602Minimum
4,8005,500241,686186,948222,661
5,1005,900241,686198,632220,577
5,4006,200241,686210,316218,344Recommended
5,7006,600241,686222,001215,959
6,0006,900241,686233,685213,416
6,3007,200233,478233,478210,709
6,7507,800207,439207,439207,833Maximum
6,9007,900181,401181,401204,780
7,2008,300155,363155,363201,541
7,5008,600129,324129,324198,108
7,8009,000103,286103,286194,471
8,1009,30077,24777,247190,618
8,4009,70051,20951,209186,535
8,70010,00025,17025,170182,207

TORQUE TENSION COMBINED LOAD CURVE

For FSS-265 3.250 X 2.000 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: 2.875, 7.90#
S135 Premium Class.

TORQUE TENSION COMBINED LOAD CURVE

FSS-265 3.250 X 2.000 CONNECTION OD WEAR CURVE

FSS-265 3.250 X 2.000 CONNECTION OD WEAR CURVE
THIS TECHNICAL INFORMATION IS FOR REFERENCE ONLY