TM 5-3820-256-10
c. Connect the auxiliary drum line to the elevators. Use the auxiliary drum to lift the leader pipe and position it
above the overflow pipe in the mud pit. Lower the leader pipe into the overflow pipe until the elevators rest on
the mud pit. Disconnect the auxiliary drum line.
d. Assemble a coupling to a section of casing in the same manner as to the leader pipe. Attach the elevators to the
casing and use the auxiliary drum line to raise it into position over the leader pipe. Set the casing into the leader
pipe coupling and insert a nylon locking spline.
e. Operate the auxiliary drum to raise the entire assembly high enough to remove the lower elevators. Then lower
the casing into the hole, resting the second elevator on the mud pit overflow pipe.
f. Repeat the procedure to add as much surface casing as is required to support the overburden. When the
required casing is in place, cut the top section of casing so that it is flush with the top of the mud pit overflow
pipe. Now resume drilling.
2-36.
Setting Well Casing.
a. When samples and tests indicate the desired bearing formation has been located, drill the hole about one foot
past the formation. Then remove all drill pipe, collars, and the bit or down-the-hole tools.
b. Cut the interlocking end from a section of strainer (See figure 2-45). Bond a cap to the cut end of the strainer.
c. Assemble another section of strainer and rotate 1/4 turn to make the connection.
d. Assemble a strainer clamp to the top strainer and attach the auxiliary drum line to the clamp chain.
e. Operate the auxiliary drum to raise the strainers and position them above the mud pit overflow pipe.
f. Lower the auxiliary line until the strainer clamp rests on top of the mud pit. Disconnect the auxiliary drum line.
g. Assemble another strainer clamp to the next strainer section and move it into place on the first strainer using the
auxiliary drum line. Lock the strainer sections together by rotating 1/4 turn. Lift the assembled strainer enough
to remove the bottom clamp, then lower strainers to rest on the top clamp.
h. Continue to add strainer sections until the required length of strainers is attained, then assemble a strainer
coupling to the top strainer. Always lubricate the coupling o-rings prior to assembly.
2-107
