HYBRID WORKSTRING FEATURING TUBING DIMENSIONS WITH DRILL PIPE DURABILITY AND STRENGTH

FSS-329
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.

Frac String Performance Characteristics Sheet

Pipe Size and Weight:
Pipe Grade:
Range:
Connection

3 1/2 12.95 IEU
S135
2
4.0 X 2.50 FSS-329

	New-API	Premium
OD (in)	3.500	3.350
Wall Thickness (in)	0.375	0.300
ID (in)	2.750	2.750
Calculated Plain End Weights (lbs/ft)	12.510	9.768
Note: Premium properties are calculated based on uniform OD and will thickness.
Cross sectional area pipe body (in²)	3.682	2.875
Cross sectional area OD (in²)	9.621	8.814
Cross sectional area ID (in²)	5.940	5.940
Section Modulus (in³)	2.605	2.015
Polar Section Modulus (in³)	5.210	4.030
Torsional Strength (ft-lbs)	33,800	26,200
Tensile Strength (lbs)	497,000	388,100
80% Torsional Strength (ft-lbs)	27,000	21,000
Pressure Capacity (psi)	25,313	23,143
Collapse Capacity (psi)	25,829	22,014

FSS-329
OD (in)	4.000
ID (in)	2.500
*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)	17,200	19,780
Severe Service Level Recommended Make-up Torque (ft-lbs) (70%)	12,000	13,800
Standard Service Level Recommended Make-up Torque (ft-lbs) (60%)	10,300	11,900
Min Recommended Make-up Torque (ft-lbs)	8,600
Balance OD {in)	3.981
Tensile Strength (lbs)	389,400
Min OD for Tension (in)	3.829

API Adjusted Weight (kg/m)(lbs/ft)	19.78	13.29
Approximate Length (M)(ft)	9.75	32.00
Working Pressure		15,000
Fluid Displacement (CuM/M)(gal/ft)	0.00253	0.203
Fluid Capacity (CuM/M)(gal/ft)	0.00374	0.301
Drift Size (mm)(in)	61.93	2.438

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)	291.7
BUR (dogleg) (deg/100ft	19.6
BUR(dogleg) deg/100 M.	64.5

Name	ID	ID Area	OD	Drift	Annular Area	Annular/ID Ratio	ID/Annular Ratio	FPS Down Tube @ 26 BPM	FPS Down Annulus @ 5 BPM	Max Torque
3-1/2, 12.95, S135 FSS-338	2.562	5.1552	4.125	4.423	2.0006	39%	258%	68	34	15,100
3-1/2, 12.95, S135 FSS-329	2.500	4.9087	4	4.423	2.7983	57%	175%	71	24	13,400
2-7/8, 7.90, P110 Two Step	2.265	4.0293	3.438	4.423	6.0814	151%	66%	87	11	4,400
2-7/8, 10.40, S135, PTECH28+	2	3.1416	3.625	4.423	5.0441	161%	62%	112	13	12,200

With max MUT of	13,400	Ft-Lbs
The max tensile load* =	241,000	Lbs
With recommended MUT of	11,500	Ft-Lbs
The max tensile load* =	378,000	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