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.
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-API | Premium | |
|---|---|---|
| OD (in) | 2.875 | 2.765 |
| Wall Thickness (in) | 0.276 | 0.221 |
| ID (in) | 2.323 | 2.323 |
| Calculated Plain End Weights (lbs/ft) | 7.657 | 5.996 |
| Note: Premium properties are calculated based on uniform OD and wall thickness. | ||
| Cross sectional area pipe body (in2) | 2.254 | 1.765 |
| Cross sectional area OD (in2) | 6.492 | 6.003 |
| Cross sectional area ID (in2) | 4.238 | 4.238 |
| Section Modulus (in3) | 1.339 | 1.040 |
| Polar Section Modulus (in3) | 2.677 | 2.081 |
| New-API | Premium | |
| Torsional Strength (ft-lbs) | 17,400 | 13,500 |
| Tensile Strength (lbs) | 304,200 | 238,200 |
| Pressure Capacity (psi) | 22,680 | 20,736 |
| Collapse Capacity (psi) | 23,432 | 18,971 |
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 Compound | NCS30 |
| Friction Factor | 1.15 |
| 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 value | 0.16856 |
Frac String Properties
| API Adjusted Weight (kg/m)(lbs/ft) | 12.36 | 8.31 |
| Make up loss (mm)(in) | 70 | 2.75 |
| Approximate S/S Length (M)(ft) | 9.61 | 31.5 |
| Working Pressure (kPa)(psi) | 103421 | 15,000 |
| Fluid Displacement (CuM/M)(gal/ft) | 0.00158 | 0.127 |
| Fluid Capacity (CuM/M)(gal/ft) | 0.00266 | 0.214 |
| Drift Size (mm)(in) | 49.23 | 1.938 |
Frac String Bend Radius
| These calculations are based on new pipe with nominal wall | |
|---|---|
| Based on Bending Stress (psi) at Pipe OD | 15,000 |
| Radius of Curvature ( R ) (ft) (@ OD of pipe) | 239.6 |
| BUR (dogleg) deg/100 ft | 23.9 |
FSS in 4.5" x 13.5# casing:
| Name | ID | ID Area | OD | Sleeve Drift | Annular Area | Annular/ID Ratio | ID/Annular Ratio | FPS Down Tube @ 25 BPM | FPS Down Annulus @ 5 BPM | Max Torque |
|---|---|---|---|---|---|---|---|---|---|---|
| 2-7/8, 7.90, S135 FSS-265 | 2 | 3.1416 | 3.25 | 3.7 | 2.4563 | 78% | 128% | 107 | 27 | 7,800 |
| 2-3/8, 5.95, P110 Two Step | 1.805 | 2.5588 | 2.906 | 3.700 | 4.1195 | 161% | 62% | 132 | 16 | 3,400 |
| 2-7/8, 7.90, P110, Two Step | 2.265 | 4.0293 | 3.438 | 3.700 | 1.4688 | 36% | 274% | 84 | 46 | 4,400 |
FSS in 4.5" x 11.6# casing:
| Name | ID | ID Area | OD | Sleeve Drift | Annular Area | Annular/ID Ratio | ID/Annular Ratio | FPS Down Tube @ 25 BPM | FPS Down Annulus @ 5 BPM | Max Torque |
|---|---|---|---|---|---|---|---|---|---|---|
| 2-7/8, 7.90, S135 FSS-265 | 2 | 3.1416 | 3.25 | 3.875 | 3.4975 | 111% | 90% | 107 | 19 | 7,800 |
| 2-3/8, 5.95, P110 Two Step | 1.805 | 2.5588 | 2.906 | 3.875 | 5.1607 | 202% | 50% | 132 | 13 | 3,400 |
| 2-7/8, 7.90, P110, Two Step | 2.265 | 4.0293 | 3.438 | 3.875 | 2.5100 | 62% | 161% | 84 | 27 | 4,400 |
FSS-265 Working Parameters
| With max MUT of | 7,800 | Ft-Lbs |
| The max tensile load* = | 207,439 | Lbs |
| With recommended MUT of | 6,200 | Ft-Lbs |
| The max tensile load* = | 218,344 | Lbs |
| Working Pressure | 15,000 | psi |
| Test Pressure | 22,500 | psi |
| 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. | |||||
| Torque | Tension | ||||
| Applied to String | Make Up Torque using NCS30 with FF of 1.15 | Limits of Combined Loading on the FSS-265 Connection | Applied to String | MAKEUP TORQUE | |
| 1.15 | Pin Yield | Shoulder Separation | |||
| Ft-Lbs | Pounds | ||||
| 300 | 350 | 241,686 | 11,684 | 238,154 | |
| 600 | 700 | 241,686 | 23,368 | 237,978 | |
| 900 | 1,000 | 241,686 | 35,053 | 237,684 | |
| 1,200 | 1,400 | 241,686 | 46,737 | 237,271 | |
| 1,500 | 1,700 | 241,686 | 58,421 | 236,739 | |
| 1,800 | 2,100 | 241,686 | 70,105 | 236,088 | |
| 2,100 | 2,400 | 241,686 | 81,790 | 235,316 | |
| 2,400 | 2,800 | 241,686 | 93,474 | 234,422 | |
| 2,700 | 3,100 | 241,686 | 105,158 | 233,405 | |
| 3,000 | 3,500 | 241,686 | 116,842 | 232,262 | |
| 3,300 | 3,800 | 241,686 | 128,527 | 230,993 | |
| 3,600 | 4,100 | 241,686 | 140,211 | 229,595 | |
| 3,900 | 4,500 | 241,686 | 151,895 | 228,065 | |
| 4,200 | 4,800 | 241,686 | 163,579 | 226,402 | |
| 4,500 | 5,200 | 241,686 | 175,264 | 224,602 | Minimum |
| 4,800 | 5,500 | 241,686 | 186,948 | 222,661 | |
| 5,100 | 5,900 | 241,686 | 198,632 | 220,577 | |
| 5,400 | 6,200 | 241,686 | 210,316 | 218,344 | Recommended |
| 5,700 | 6,600 | 241,686 | 222,001 | 215,959 | |
| 6,000 | 6,900 | 241,686 | 233,685 | 213,416 | |
| 6,300 | 7,200 | 233,478 | 233,478 | 210,709 | |
| 6,750 | 7,800 | 207,439 | 207,439 | 207,833 | Maximum |
| 6,900 | 7,900 | 181,401 | 181,401 | 204,780 | |
| 7,200 | 8,300 | 155,363 | 155,363 | 201,541 | |
| 7,500 | 8,600 | 129,324 | 129,324 | 198,108 | |
| 7,800 | 9,000 | 103,286 | 103,286 | 194,471 | |
| 8,100 | 9,300 | 77,247 | 77,247 | 190,618 | |
| 8,400 | 9,700 | 51,209 | 51,209 | 186,535 | |
| 8,700 | 10,000 | 25,170 | 25,170 | 182,207 | |
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
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.
