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.

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

	New-API	Premium
OD (in)	2.375	2.273
Wall Thickness (in)	0.254	0.203
ID (in)	1.867	1.867
Calculated Plain End Weights (lbs/ft)	5.751	4.491
Note: Premium properties are calculated based on uniform OD and wall thickness.
Cross sectional area pipe body (in²)	1.692	1.322
Cross sectional area OD (in²)	4.430	4.059
Cross sectional area ID (in²)	2.738	2.738
Section Modulus (in³)	0.813	0.629
Polar Section Modulus (in³)	1.626	1.258
Torsional Strength (ft-lbs)	10,600	8,200
Tensile Strength (lbs)	228,500	178,400
80% Torsional Strength (ft-lbs)	8,500	6,600
Pressure Capacity (psi)	25,266	23,101
Collapse Capacity (psi)	25,788	21,976

FSS-247
OD (in)*	3.062
ID (in)*	1.805
*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)	7,650	8,798
Recommended Make-up Torque (ft-lbs) (70%)	5,400	6,200
Recommended Make-up Torque (ft-lbs) (60%)	4,600	5,300
Min Recommended Make-up Torque (ft-lbs)	3,800
Balance OD {in)	3.050
Tensile Strength (lbs)	230,200
Min OD for Tension (in)	2.843

API Adjusted Weight (kg/m)(lbs/ft)	9.45	6.35
Approximate Length (M)(ft)	9.74	31.96
Working Pressure		15,000
Fluid Displacement (CuM/M)(gal/ft)	0.00121	0.097
Fluid Capacity (CuM/M)(gal/ft)	0.00171	0.138
Drift Size (mm)(in)	45.03	1.773

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)	197.9
BUR (dogleg) deg/100 ft	29

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-./83, 5.95, S135 FSS-247	1.805	2.5588	3.062	3.700	3.3883	132%	76%	132	20	6,200
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, S135, FSS-247	1.805	2.5588	3.062	3.875	4.4295	173%	58%	132	15	6,200
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	6,200	Ft-Lbs
The max tensile load* =	131,900	Lbs
With recommended MUT of	5,300	Ft-Lbs
The max tensile load* =	214,600	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