air and gas drilling manual

8/3/2019 Air and Gas Drilling Manual

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Air and Gas Drilling Manual,

P. 145

Illustrative Example 4.1 A three-stage reciprocating primary air compressor

system unit is rated to have a volumetric flow rate of 900 scfm and a maximum

pressure capability of 240 psig at API Mechanical Equipment Standards standard

atmospheric conditions. The compressor has a diesel prime mover that is rated to

have a maximum power of 300 horsepower at a compressor shaft speed of 1,000 rpm

(at API Standard conditions). The 1,000 rpm is the shaft speed required for the

compressor volumetric flow rate of 900 scfm. The prime mover is naturally

aspirated. This reciprocating compressor system has a clearance ratio of 0.06 and a

mechanical efficiency of 0.90.

Determine the horsepower required by the prime mover to operate the

compressor against a flow-line back pressure of 150 psig for, a) a surface location at

sea level (use API Mechanical Equipment Standards standard atmospheric conditions

for sea level) and for, b) a surface location elevation of 6,000 ft (use average mid

latitudes data in Table 4-1).


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P. 148

Illustrative Example 4.2 A three-stage helical lobe (screw) primary air

compressor system unit is rated to have a volumetric flow rate of 900 scfm and a

maximum pressure capability of 240 psig at API Mechanical Equipment Standards

standard atmospheric conditions. The compressor has a diesel prime mover that is

rated to have a maximum power of 300 horsepower at a compressor shaft speed of

1,000 rpm (at API Standard conditions). The 1,000 rpm is the shaft speed required

for the compressor volumetric flow rate of 900 scfm. The prime mover is naturally

aspirated. This rotary compressor system has a mechanical efficiency of 0.90.

Determine the horsepower required by the prime mover to operate the

compressor against a flow-line back pressure of 150 psig for, a) a surface location at

sea level (use API Mechanical Equipment Standards standard atmospheric conditions

for sea level) and for, b) a surface location elevation of 6,000 ft (use average mid

latitudes data in Table 4-1).


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P. 151

Illustrative Example 4.3 Determine the diesel fuel consumption rate (in

gallons per hour) for the primary reciprocating piston compressor system and

conditions given in Illustrative Example 4.1 for: a) a surface location at sea level

and, b) a surface location elevation of 6,000 ft.

P. 168

Illustrative Example 5.1 Using the basic equations above, determine the direct

circulation minimum volumetric flow rate for a well with a 4 1/2 inch openhole

borehole (4 1/2 inch drill bit diameter) and a uniform drill string composed of a drill

pipe outside diameter of 2 3/8 inch. The anticipated drilling rate in a sequence of

competent unfractured limestone rock (sedimentary rock) is assumed to be 30 ft/hr.

The drilling depth is 1,000 ft.

air and gas drilling manual

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