Free Point Calculation

FREE-POINT CALCULATION
PIPE WEIGHT PER FOOT
MIN. STRENGTH (PIPE BODY OR COUPLED JOINT
TOTAL PIPE RUN
DEPTH TO TOP OF CEMENT
CASINJAC TOTAL CYLINDER AREA
CASINJAC MAXIMUM STROKE
MAXIMUM PULL FORCE
MAXIMIMUM PULL PRESSURE
MINIMUM FORCE TO PULL SLIPS
MAXIMUM RECOVERABLE PIPE STRING WEIGHT
PRESSURE REQUIRED TO PULL STRING WEIGHT
INTERMEDIATE CALCULATION
MAX. USABLE STRETCH FORCE ( 3 STRETCHES)
FIRST PIPE STRETCH
FIRST STRETCH FORCE
FIRST FREE POINT
SECOND PIPE STRETCH
SECOND STRETCH FORCE
SECOND FREE POINT
THIRD PIPE STRETCH
THIRD STRETCH FORCE
THIRD FREE POINT

Equation

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Equation Result

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Free-point equation = pipe wt./ft. (lbs)* pipe stretch (ins.)* 735,000/stretch force (lbs)

Example: 17*25.75*735,000/40,000 = 8043.65