tubing anchor catcher application & operation - · pdf fileo∆p o) a i = internal area of...

Jyothi Samayamantula

International SRP workshop 2013, OKC | Don-Nan 1

What is a TAC & how it works?


4.5 TAC 5.5 TAC

Why use a TAC Production gains and losses

Tubing parting


Application and Installation Selection of Well heads – 1. Screw type 2. Slip type


Application and Installation Casing and Tubing size and type

Shear value

Above and below the perforations

Above and below the pump

Slip types

Running and setting

Normal and emergency release


Tubing Stretch Factors that alter the tubing string length:

Piston effect due to buoyance

Piston effect due to plugging

Ballooning effect

Temperature effect


Tubing under compression due to the fluid pressure acting on the bottom face of the freely hanging tubing.


Piston effect due to buoyance (FPB):

Force (FPB) with a pressure p acting underneath the tubing.

FPB = pAcs

pfluid head = ρTVD

ρ = 0.433 s.g


Piston effect due to buoyance (FPB):

The fluid load results in an axial

force (FPP) on the tubing when the bottom of the tubing is plugged.

Fpp = ∆pplug Ai ∆pplug = pabove – pbelow pabove and pbelow should be considered at the operating fluid levels International SRP workshop 2013, OKC | Don-Nan 9

Piston effect on the tubing string due to plugging (FPP):

Radial forces on the tubing string causes the tubing to change it’s length longitudinally

FB = 2υ (Ai∆pi – Ao∆po )

Ai = internal area of the tubing

Ao = external area of the tubing

∆pi = internal pressure difference above

and below the plug

∆po = external pressure difference above

and below the plug

υ = Poisson’s ratio, defined as −𝑟𝑎𝑑𝑖𝑎𝑙 𝑠𝑡𝑟𝑎𝑖𝑛

𝑎𝑥𝑖𝑎𝑙 𝑠𝑡𝑟𝑎𝑖𝑛

(approximately 0.3 for most of the steels used in oil field)


Ballooning effect (FB)

Considering steady state flow.

∆LT = CTL∆T

CT = coefficient of thermal

expansion (°F-1)

∆T = is the average change in

temperature from the

base case to the load

case (°F)

L = length of the tubing

(same units as ∆LT)


Temperature effect (FT)

Coefficient of thermal expansion is itself a temperature dependent property.

For Carbon steels it is around 5.5 x 10-6 °F-1 - 7.5 x 10-6 °F-1.

FT = CTE∆T (Ao - Ai)

E= Young’s modulus (30 x 106 psi for the for most of the steels used in oil field)


Temperature effect (FT)

Total minimum initial force(FI)

Total minimum initial load (FI) = Fpp + FT – FB – FPB


Comparative study Example 1: Tubing size: 2-3/8 OD Depth of pump & anchor: 6,000’ Fluid level at the time anchor is set (from surface): 5,000’ Operating fluid level (from surface): 6,000’ Fluid temperature at surface: 90°F Mean yearly temperature for area: 60°F Tubing string weight: 28,200 lbs. Rod string weight: 11,500 lbs. Pump plunger size: 1-1/2” Weight of fluid in tubing: 9,000 lbs. (est.) Density (corresponding to a fluid of specific gravity 1.154): 0.5

psi/ft.


Comparative study Example 1:


Baker Weatherford Lubinsky FI

FI 11,220 lb. 11,200 lb. 11,300 lb. 12,642 lb.

∆L 20.65 20.61 20.79 23.26 in.


Tubing size: 2-7/8 OD

Depth of pump: 6,000’

Anchor depth: 6,500’

Fluid level at the time anchor is set: 4,000’

Working fluid level: 5,000’

Fluid temperature at surface: 100°F

Mean yearly temperature for area: 60°F

Density (corresponding to a fluid of specific gravity 1.154): 0.5 psi/ft.




Baker Weatherford Lubinsky FI

FI 15,860 lb. 16,400 lb. 16,000 lb. 18,021 lb.

∆L 20.99 in. 21.71 in. 21.18 in. 23.86 in.

Lubinski Graph


Thank you

Questions ?


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tubing anchor catcher application & operation - · pdf fileo∆p o) a i = internal area of...

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