Page 96 - Air and Gas Drilling Manual

3-24 Air and Gas Drilling Manual
100,000 psi. Similar data is shown for API X95, API G105, and API S135 steel
grades [1, 2].
Table B-4 gives the dimensions and mechanical properties of various drill pipe
sizes (and nominal weights) and tool joint combinations for API grade E75 [1, 2].
The approximate (actual) weight per unit length data given in the table is for a 30 ft
drill pipe element (Range 2). In general, API grade E75 drill pipe elements are used
on single rotary drilling rigs. These drill pipe elements are usually Range 1 lengths
(see Table 1-1). Table B-4 also shows the drill pipe body to tool joint type (either
external upset or internal upset), the tool joint connection, outside diameter, inside
diameter, tensile yield of the pipe body and tool joint (threaded connection), and the
torsion yield of the pipe body and tool joint (threaded connection). The data given
for tensile yield and torsion yield are based on the minimum yield of the API grade
E75 (i.e., 75,000 psi).
An example will be used to demonstrate how to use the API drill pipe tables in
Appendix B. Table B-4 gives data for E75 grade steel drill pipe. In Column (1) of
Table B-4 is given a 2 3/8 inch nominal size drill pipe (also pipe body size given in
Table B-3). In Column (2) is given 6.65 lb/ft nominal unit weight, (also nominal
unit weight given in Table B-3). In Column (4) is given the upset type (in this case
EU is external upset) and in Column (5) is given the connection type (in this case
NC26 (IF)). Column (3) shows that this drill pipe has an actual unit weight of 6.99
lb/ft. Column (6) gives the connection tool joint outside diameter of 3 3/8 inches
and Column (7) gives the connection tool joint inside diameter of 1 3/4 inches.
Column (8) gives a drift inside diameter of 1.625 inches (the outside diameter of the
largest survey or other tool that can pass through the drill pipe element) for this drill
pipe. This diameter is governed by the tool joint inside diameter. Column (9)
gives an axial tensile force of 138,214 lb to yield the steel of the drill pipe body and
Column (10) gives an axial tensile force of 313,681 lb to yield the steel of the tool
joint. Thus, the weakest part of the drill pipe element to axial tension is the pipe
body. Column (11) gives a torque of 6,250 ft-lb to give torsion yield of the steel of
the pipe body and Column (12) gives a torque of 6,875 ft-lb to give torsion yield of
the steel of the tool joint box. Thus, the weakest part of the drill pipe element to
torque is the pipe body.
Table B-5 gives similar data as in Table B-4 but for the higher strength grades
of drill pipe steel (i.e., X95, G105, and S135). In Column (1) of Table B-5 is given
a 4 1/2 inch nominal size drill pipe (also pipe body size given in Table B-3). In
Column (2) is given 16.60 lb/ft nominal unit weight, (also nominal unit weight
given in Table B-3). In Column (4) is given the upset type (in this case EU is
external upset) and the steel grade S135. In Column (5) is given the connection type
(in this case NC50). Column (3) shows that this drill pipe has an actual unit weight
of 18.62 lb/ft. Column (6) gives the connection tool joint outside diameter of 6 5/8
inches and Column (7) gives the connection tool joint inside diameter of 3 1/2
inches. Column (8) gives a drift inside diameter of 3.375 inches (the outside
diameter of the largest survey or other tool that can pass through the drill pipe
element) for this drill pipe. This diameter is governed by the tool joint inside
diameter. Column (9) gives an axial tensile force of 595,004 lb to yield the steel of
the drill pipe body and Column (10) gives an axial tensile force of 1,183,908 lb to
yield the steel of the tool joint. Thus, the weakest part of the drill pipe element to