casing hanger test guideline_g22 02 (3)

8/13/2019 Casing Hanger Test Guideline_G22 02 (3)

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Design Guideline G22.02: Casing Hanger Load Capacity

Step 6.1: Enter Given Data

Casing Hanger: C-21

HPI or Pressure Isolation Seals

being used? No

Casing Description:

OD (in): 20

a=OD/2 a= 10

ID (in): 19

b=ID/2 b= 9.5

Minimum Yield Strength of

Casing, Syp(psi): 55000

Collapse Pressure of Casing,

qcollapse(psi): 770

Plain End Yield Strength of

Casing, PEYS (lbs): 1684683

Buttress Joint Strength of

Casing, BJS (lbs): 1682947

Round Joint Strength of

Casing, RJS (lbs): 2361822

Joint Type: Buttress

Modulus Of Elasticity, E (psi): 30000000

Poison's Ratio, v: 0.292

This is a step-by-step worksh eet designed to assis t in the calculations out l ined in section 6.0 of Design Guidel ine

G22.02. The user should be able to use this wo rksheet to determine the recommend ed operating range for a given

sl ip casing hanger and a given casing type wi th respect to h ang load and pressure.

20 OD - 106.5 LB/FT-(K55)

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Step 6.2: Determine Casing Application (Thick-wall vs. Thin-wall vessel)

(a+b)ratio= __2__

Eqn.(1) (a-b) ratio= 19.50

application= if (ratio >10,"thin-wall","thickwall")

application= thin-wall

Let Dyp = Diametrical Deflection that will cause internal yield in the casing (in)

Let R = Mean Casing Radius (in)

(a+b)

R= 2

R= 9.75

Dyp =Eqn.(2) if application = "thin-wall"

(a+b)2- v * (a

2- b

2)

Eqn.(3) Syp* otherwise

Dyp = 0.035

Let t = casing wall thickness (in)

Let K = a constant based on casing hanger type

0.3 for C-21 and C-22 casing hangers

0.2 for C-29 casing hangers

If the mean radius of the casing divided by the wall thickness is less than or equal to 10, then the thick-wall vessel

criteria applies. If the ratio is greater than 10, then the thin-wall vessel criteria applies.

2*R*Syp

Step 6.3: Determine the Diametrical Deflection in the Casing That Will Cause Internal Yield

E

Step 6.4: Determine the Maximum Hang Load Capacity, PLyield

Now that the maximum diametrical deflection for th egiven casing has been determined, the hang load that will

generate that same amount o fdeflection must be determined. This value will be the Maximum Hang Load Capacity

for the given casing hanger and casing.

Let PLyield= hang load required to generate a diametrical casing deflection equal to Dypunder zero pressure

conditions (lbs)

2 * a * E

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t= a-b

t= 0.5

K= 0.2 if Type = "C-29"0.3 otherwise

K= 0.3

Eqn.(4) PLyield= Dyp*pi*t*EK*R

PLyield= 5.574E+05

Step 6.5: Determine the Diametrical Deflection Due To Collapse Pressure

Let Dcollapse= Diametrical Deflection due to collapse Pressure only (in)

Let f = a constant based on casing hanger type used in thin-wall cases;

3 for C-21 and C-22 casing hangers;

4 for C-29 casing hangers

Let = a variable term in the equation based on R, t, and v used in thin-wall cases

f= 4 if Type = "C-29"

3 otherwise

f= 3

Eqn.(6)

= 0.583

Eqn.(5) if application = "thin-wall"

Eqn.(7)

otherwise

Dcollapse = 0.010

Determine the diametrical deflection that results when the casing is subjected to its collapse pressure with no

hanging load present.

2

42 2

3* (1 )

*

v

R t

2

**

2 * * 1 * cos( **

collapse f

collapse

q RD e f

E t

*collapseq a a bv

E a b

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Step 6.6: Determine the Maximum Additional Loading at Collapse Pressure

Let Dadditional_load= Diametrical deflection due to hang load at collapse pressure (in)

Let PLadditional_load= Hang load required to generate a deflection equal to Dadditional_load(lbs)

Dadditional_load= Dyp- DcollapseEqn.(8) Dadditional_load= 2.453E-02

PL_additional_load= Dadditional_load* pi * t * EEqn.(4) K * R

PL_additional_load= 3.953E+05

Step 6.7 - 6.8: Graph the Recommended Operating Range

The graph will have pressure (psi) on the x-axis and Hang Load (lbs) on the y-axis.

Calculate the slope between the points (0 psi, 0.8*PLyield) and (collapse pressure, PL_additional_load)

slope = PL_additional_load- 0.8*PLyieldEqn.(9) qcollapse - 0

slope = -65.72646213

slopefactor= 0 if (HPI = "Yes") or (Type = "C-21")

Eqn.(10) -1 * slope otherwise

slopefactor= 0

Note:slopefactorequals zero for C-21 casing hangers and for C-22, C-29 casing hangers with HPI seals.

Limit_1 = RJS if Joint Type = "Round"

BJS otherwise

Limit_2 = RJS if Joint Type = "Unknown"

Limit_1 otherwise

Max_Limit = 0.8*PLyield

0.8*PEYS if 0.8*PEYS < 0.8*PLyield

t co apse pressure, t e cas ng s a rea y e ecte ue to t e pressure. us, t e amount o e ect on t at can

occur due to loading is limited since the total deflection must be less than or equal to Dyp. First calculate the

amount of allowable deflection due to loading, then calculate the amount of hang load required to generate this

deflection.

If Buttress Joint Strength or Round Joint Strength or 80% of Plain End Yield is less than 80% of P Lyield, then the

smallest of the three values shall serve as a maximum load limit for the graph. Note that Buttress Joint Strength is

not considered as a possible limit when the joint type is umknown. Determine the least of the four values, as

appropriate.

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Max_Limit = Max_Limit

Limit_1 if Limit_1 < Max_Limit

Max_Limit = Max_Limit

Limit_2 if Limit_2 < Max_Limit

Max_Limit = 4.459E+05

Let TP = test pressure (psi)

TP = 0,1qcollapse

Max_Rec_Load(TP) = (0.8*PLyield) - (TP*slopefactor)

Type = C-21 Syp= 5.500E+04 0.8 * PLyield= 4.459E+05

HPI = No qcollapse= 7.700E+02 0.8 * PEYS = 1.348E+06

OD = 20 0.8 * qcollapse= 6.160E+02 BJS = 1.683E+06

ID = 19 Joint Type = Buttress RJS = 2.362E+06

application = thin-wall Max_Limit = 4.459E+05

1.) the x-axis

2.) the y-axis

3.) the line representing the Maximum Calculated Recommended Hang Load

4.) the vertical line at 80% collapse pressure

5.) the horizontal line at Max_Limit

The recommended operating range is represented by the area in the 1st quadrant of the graph that is confined by:

The equation of the line to graph will be the Maximum Recommended Hang Load for a given casing exposed to a

given pressure with the given casing hanger. This equation can be applied to the recommended pressure range

which extends from 0 psi to 80% of the collapse pressure.

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Here are some values at specific pressures to be used when graphing for reference only:

Max_Rec_Load(0) = 4.459E+05

Max_Rec_Load(0.8*qcollapse) = 4.459E+05

Max_Rec_Load(qcollapse) = 4.459E+05

Given Pressure, qgiven(psi) = 10000

Allowable_Load = Max_Rec_Load(qgiven) if (Max_Rec_Load(qgiven)


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Given Load, loadgiven(lbs) = 165000

Max_Pressure(loadgiven) = 0.8 * PLyield- loadgiven

slopefactor

Allowable_Pressure = Max_Pressure(loadgiven) if (Max_Pressure

casing hanger test guideline_g22 02 (3)

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