11/11/2022 0 Comments Drilling hydraulics optimization![]() ![]() Bit hydraulics can do much more than bottomhole cleaning, and hydraulic parameters can be selected beyond the range of the Fullerton chart or the more » Amoco hydraulic drillability curve. Laboratory studies have proved significant rock-cutting action by the combination of hydraulic and mechanical power. The development of jet-bit drilling is the main direction in upgrading drilling techniques in the near future. Drilling practice in China has shown that there is still much room for a further increase of pump pressure and specific hydraulic horsepower. Three levels in the development of jet-bit drilling in China are discussed, showing significant economic results for each higher pump-pressure level. Results indicate that bit hydraulic horsepower levels in excess of popular rules of thumb are cost effective in slow drilling due to high overbalance pressure. Reduction in drilling costs due to the measured response of ROP to improved hydraulic cleaning is compared to increased operating costs required to provide additional hydraulics. three nozzle configurations, but improvements were not consistently out of the range of normal test to test variations. Some improvements in ROP at constant bit hydraulic horsepower and impact force levels were obtained with two nozzle more » configurations vs. Bit hydraulic horsepower was varied from 0.72 to 9.5 HHP/in/sup 2/ using two or three nozzles in sizes ranging from 9/32 to 14/32 inches in diameter. Tests were conducted in Mancos Shale rock samples at 700 psi and 4000 psi simulated overbalance pressure conditions using a 9.1 pound per gallon bentonite-barite water base drilling fluid. Recommendations for field application of the optimizing technique are =, number = ,Įffects of hydraulic cleaning parameter variations on rate of penetration response of 7 7/8 inch diameter soft formation insert bits have been measured in laboratory drilling tests. The optimum condition for bit hydraulics reveals that fuel costs to power mud pumps and pump maintenance costs should be a fixed percentage of total operating costs depending on bit ROP response to increased bit hydraulic horsepower. Graphical relationships of fuel and pump maintenance cost increases, bit ROP increases and drilling cost variations with increasing standpipe pressure and bit hydraulic horsepower are presented. Effects of blanked nozzles and asymmetric nozzle configurations are also presented. #DRILLING HYDRAULICS OPTIMIZATION FULL#Previously unpublished full scale laboratory drilling data obtained by the authors and test results reported by other authors are presented to demonstrate the relationship of ROP to increased bit hydraulic horsepower. This paper is an extension of the previous work and demonstrates practical application of the new hydraulics optimization method. In a previous paper, the authors derived a condition for optimum bit hydraulics considering increases in rate of penetration (ROP), fuel costs and pump maintenance costs with increased bit hydraulics. ![]()
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