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

	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
Torsional Strength (ft-lbs)	17,400	13,500
Tensile Strength (lbs)	304,200	238,200
80% Torsional Strength (ft-lbs)	13,900	10,800
Pressure Capacity (psi)	22,680	20,736
Collapse Capacity (psi)	23,432	18,971

FSS-265
OD (in)*	3.250
ID (in)*	2.000
*Frac String with a Material Yield Strength of 135000 psi
Pin Tong length (in)	5
Box Tong length (in)	7
		Friction Factor 1.15
Torsional Strength (ft-lbs)	8,990	10,339
Severe Service Level Recommended Make-up Torque (ft-lbs) (70%)	6,300	7,200
Standard Service Level Recommended Make-up Torque (ft-lbs) (60%)	5,400	6,200
Min Recommended Make-up Torque (ft-lbs)	4,500
Balance OD {in)	3.237
Tensile Strength (lbs)	246,500
Min OD for Tension (in)	3.094

API Adjusted Weight (kg/m)(lbs/ft)	12.23	8.22
Approximate Length (M)(ft)	9.75	32.00
Working Pressure		15,000
Fluid Displacement (CuM/M)(gal/ft)	0.00156	0.126
Fluid Capacity (CuM/M)(gal/ft)	0.00266	0.214
Drift Size (mm)(in)	49.23	1.938

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

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	7,200
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

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	7,200
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

With max MUT of	7,200	Ft-Lbs
The max tensile load* =	154,000	Lbs
With recommended MUT of	6,200	Ft-Lbs
The max tensile load* =	238,000	Lbs
Working Pressure	15,000	psi
Test Pressure	22,500	psi
NCS-30 thread compound required
*Tensile load including pressure end load

THIS TECHNICAL INFORMATION IS FOR REFERENCE ONLY