7/28/2019 BitHydraulics1.xls

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Name of Company:Well Name & Number:

Date: July 21, 2013

See User notes @ cell A42 before using this application.WELL GEOMETRY SEC 1 SEC 2 SEC 3 SEC 4 SEC 5 SEC 6 SEC 7

Length, ft? = 1,021 2,417Open Hole Size or Casing ID, in? = 28 17.5Drill String OD, in? = 5 5Drill String ID, in? = 4.276 4.276

CONDITIONS DRILLING MUD

Number of Jets in 1st Set? = 3 Mud Weight, ppg? = 9.2Size 1st Set of Jets, 32nds? = 15 Plastic Viscosity, cp? = 5.0Number of Jets in 2nd Set? = Yield Point, lb/100ft? = 29Size 2nd Set of Jets, 32nds? = DEPTHS CASING and BIT MD TVD

Reynolds Number 2,000 For Last Casing Set, ft.? = 1,021 1,021PSI Drop MWD and/or Mud Motor? = 250 For Bit, ft.? = 3,438 3,428

TVD CALCULATION MUD PUMP - TRIPLEX NO. 1 NO. 2

Angle of Last Survey? = 1 Liner Size, in? = 6.5MD Last Survey? = 1,021 Stroke Length, in? = 12TVD Last Survey? = 1,021 Pump Rate, spm? =MD for a New or Projected TVD? = 1,021 Efficiency of Pump, % (1 - 100)? = 95TVD Result, ft 1,021 Output, gpm

RESULT by SECTION SEC 1 SEC 2 SEC 3 SEC 4 SEC 5 SEC 6 SEC 7

Annular Velocity, fpmCritical Velocity Annulus, fpm 351 352Critical Flow Rate Annulus, gpm 10869 4039Flow TypeAnnular Lag Times, minsDrill Pipe Bore Pressure LossesAnnular Pressure Losses

RESULTS

Pressure Loss for Casing Annulus Estimated Pump Pressure 250Lag or Bottoms-Up Time, mins Nozzle VelocityECD @ Last Casing Set, ppg 9.20 Pump Hydraulic Horsepower ECD @ Bit Depth, ppg 9.20 Bit Hydraulic Horsepower Nozzle Area 0.5177 %HP @ BitSurface Equipment Loss Bit HP/inBit Pressure Drop Impact Force

LAST UPDATE JANUARY 1997 THE END APPLICATION CREATED IN 1994

USER NOTES

- Make the first Well Geometry entry in SEC 1 starting at the top of the hole ending at the projected or current MD for bi - Provision made to calculate a TVD. The result can be used for a New or Projected TVD for the Bit or Casing. - If the calculated MD for Bit in cell H17 is not correct, there is an error in one or more of the Section Length entries. - Provision made for two mud pumps in the event each pump has a different size liner. - Date is automatically posted by Excel.

If the result for ECD @ Last Casing Set shows "ERROR", the comparison check made to verify casing measureddepth has found a condition in which the Section Length entries are not in agreement with the measured depth usedfor the last casing set. Check the Section Length entries for Casing as well and the MD entry for the Casing in cell H16.

This application can evaluate or design for optimum bit hydraulics. Design is by Trial and Error. It involves varying nozarea, flow rate, mud properties and Reynolds Number to arrive at an optimum design for Bit Hydraulic Horsepower or JeImpact Force within any defined limitations. When HHP is at Max, JIF is 94% of its max. When JIF is at max, HHP isin 91% of its max. Max HHP Theory recommended when the best bottom hole cleaning needed at lower flow rates. ThMax JIF Theory is recommended when higher flow rates are needed. Optimum HHP 65% and JIF 48% of standpipe PS

Critical Velocity is the highest velocity that flow will remain laminar. Normally, calculations are made with turbulent floaround drill collars and laminar around drill pipe. Flow rate range for design is 30 to 50 gallons per inch of hole diamete

DRILLING APPLICATIONEVALUATE or DESIGN BIT HYDRAULICS