By Boyun Guo
This concise technical instruction manual, written to assist drilling engineers and drilling supervisors in underbalanced drilling (UBD) operations, comprises specific calculations. in truth, readers can simply code the mathematical versions offered during this publication and construct their very own UBD simulators in spreadsheet courses. Guo and Ghalambor conceal a lot wanted info at the purposes for drilling water wells, mine boreholes, geotechnical boreholes, and oil and fuel restoration wells via offering illustrative examples through the textual content. extra, they comprise an entire set of engineering charts with an intensive description of conception and rules. Contents: Underbalanced drilling fundamentals Air, fuel, mist, and volatile foam drilling reliable foam drilling Aerated liquid drilling picking out compressor devices box purposes Appendices (Required ventilation premiums for air drilling vertical holes; required fuel move premiums for gasoline drilling vertical holes; required ventilation premiums for air drilling deviated holes)
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Additional info for Gas volume requirements for underbalanced drilling : deviated holes
Example text
662 psia at 2,000 ft elevation. 662 (6,095) = 6,254 ft 3 / min . 43) Use of engineering charts for mist and unstable foam drilling. The engineering charts in Figures A–1 through A–29 in Appendix A and Figures B–1 through B–24 in Appendix B can be used for mist and unstable foam drilling after converting the liquid rates to equivalent ROP (Rpe). 4 A well is to be drilled to 5,500 ft with a 7 7/8 in. diameter rotary drill bit using air as a circulating fluid at an ROP of 30 ft/hr. The drillstring in this well is made up of 500 ft of 6 3/4 in.
When small bit nozzles are used, the temperature at the bit can be lower than the dewpoint and even the ice point of water due to the Joule–Thomson effect (discussed in Chapter 5). 37 guo CH 02(19-70) 9/10/02 9:11 AM Page 38 Gas Volume Requirements for Underbalanced Drilling | Deviated Holes Miska29 presents a formula to correct air humidity. 01°F/ft. Dewatering efficiency of the water trap is 95%. Misting water rate is 10 bbl/hr. Formation water influx is 30 bbl/hr. Blooey line pressure is 15 psia.
39416 − 1750. 685 (3,021) = 3,133 ft 3 / min . 5949) Engineering charts for gas drilling. Due to the trial-and-error procedure involved, gas volume requirements cannot be calculated easily without a computer program. It is therefore convenient for field engineers to use engineering charts. 6, respectively. Air volume charts are shown in Figures A–1 through A–29 in Appendix A. Gas volume charts are presented in Figures B–1 through B–24 in Appendix B. Gas volume requirements for gas of a different spe- 40 guo CH 02(19-70) 9/10/02 9:11 AM Page 41 | Air, Gas, Mist, and Unstable Foam Drilling cific gravity can be determined from these charts based on interpolation.