Drilling
After the bit has been started, rotary speed should be increased to the
practical limit indicated by rig equipment. The drill pipe, hole condition,
and depth should also be taken into consideration.
Weight should be added as smoothly as possible in 2000 pound increments.
Observations of penetration rate after each weight increase should be made
to avoid overloading. As long as the penetration rate continues to increase
with weight, then weight should be increased. However, if additional
weight does not increase the penetration rate, then the weight should be
reduced back 2000 to 3000 pounds, to avoid packing and balling-up of the
space between the diamonds. Drilling should be continued at this reduced
weight.
After making a connection, be sure to circulate just off bottom for at least
five minutes, as cuttings in the hole could damage the bit. The time spent
here may lengthen the life of the bit by many hours.
After the bit has been started, rotary speed should be increased to the
practical limit indicated by rig equipment. The drill pipe, hole condition,
and depth should also be taken into consideration.
Weight should be added as smoothly as possible in 2000 pound increments.
Observations of penetration rate after each weight increase should be made
to avoid overloading. As long as the penetration rate continues to increase
with weight, then weight should be increased. However, if additional
weight does not increase the penetration rate, then the weight should be
reduced back 2000 to 3000 pounds, to avoid packing and balling-up of the
space between the diamonds. Drilling should be continued at this reduced
weight.
After making a connection, be sure to circulate just off bottom for at least
five minutes, as cuttings in the hole could damage the bit. The time spent
here may lengthen the life of the bit by many hours.
