Page 33 - Shale Shakers Drilling Fluid Systems

16 SHALE SHAKERS AND DRILLING FLUID SYSTEMS

SHAFFER TOOL WORKS BREA, CALIFORNIA

SHAFFER DRIFT INDICATOR SHAFFER-BOLES FORMATION TESTER
The Shaffer-Boles For-
The Shaffer Drift Indicator is a mation Tester often saves
patented tool which is run on the its cost many times over
drill pipe above the bit or drill col- by positivel y proving
lar. It consists of a sub made of whether the well is capa-
heat treated alloy steel in which is ble of flowing gas or oil
or whether further work
mounted a valve operated by a will be needed. Not only
plumb bob. This bob is free to might you save the cost of
swing in all directions. Below the the casing itself, but also
plumb bob is a cup shaped pin. the cement job, the drill-
ing out, and the possibili-
The force of the circulation tends ties of necessary re-ce-
to close the valve. But if the hole is menting. Moreover, it eli-
within required limits of straight- minates the necessity of re-
ness the plumb bob hits the pin ducing the size of the hole
when the tester proves the
thereby holding the valve off the absenc e of commercial
seat so the circulation is continu- production and furthe r
ous, The diameter of the cup shaped drilling is necessary. This
pin may be changed according to the device gives reliable sam-
ples and flow tests. The
limits of straightness desired, which Shaffer - Boles Formation
may be anything up to 5 degrees. Tester in conjunction with
When the hole is more than the desir- Shaffer-Phipps Packer en-
ed degree off vertical the plumb bob ables you to secure a posi-
will miss the pin and allow valve to tive test of water shut off.
Simplicity of construction
close, thus shutting off circulation. and operation make the
To find out if the well is off ver- Shaffer - Boles Formation
tical it is only necessary to stop Tester outstanding. It has
the tools and circulation for a very few working parts —and
no springs or trips. A hard
brief time and then start circulation again. If the faced valve which is at all
hole is within the required limits of straightness cir- times under positive and
easy control from the sur-
culation will go on as usual and drilling be resumed. face, may be opened and
But when deflection from vertical, greater than the closed as many times as
required durin g testing
amount for which the machine is set, takes place operations. Three revolu-
the valve is closed thereby shutting off the pump. tions of the pipe to the
left open this valve fully—
Before being able to proceed it is necessary to lift three turns to the right
the drill pipe to a point above the crooked spot. The close it tight. No frac-
tional turns or other pre-
drill is then held up and hole is reamed straight. In cise mechanical operations
this way a continuous check is made and the hole is have to be employed. Each
valve is tested under 3000
straightened without having to disconnect the swivel pounds pressure to insure
and kelly or waiting until the tools are withdrawn it against leakage. A by-
pass consisting of a left-
from the hole. hand joint opens the test-
er below the main valve so
SHAFFER VIBRATING MUD SCREEN that the fluid pressure can be equalized on both sides of the
packer; and this joint can be unscrewed only after the
The Shaffer Vibrating Mud Screen provides an effective tester valve has been positively closed.
and economical method of reclaiming and cleaning rotary Type C is used for open hole testing where no shoulder is
mud at the well. Even gassing mud can be treated with provided. The packer is set by lowering the weight of the drill
this device. The Shaffer Screen is a simple mechanism and pipe which shears a pin. The length of tail piece may be varied
has been thoroughly proven under all kinds of drilling con- to•control the depth at which the packer is desired to be set.
ditions. There are no complicated parts.
It is noted for its long life and ease of ad-
justments. Any work on it can be done
with ordinary tools at the derrick.
The screen, which is 48 inches wide by 55
inches long, should be set on a 27 degree
inclination and is placed in the mud sys-
tem so that as the mud emerges from under
the derrick floor it flows over the screen. The rapidity
of vibration causes all the mud to flow through the screen
while particles ^ larger than the mesh are retained and fall
into the rejection pit. Special adjustments on the screen
assembly together with the peculiar method of vibrating
make the machine unique and exceptionally efficient. The
vibrating mechanism and the method of mounting the
screen (rubber insulated from metal parts) is such as to
give the screen long life. A 2T rotating cam shaft, equipped with
two W offset eccentric bearings, produce a ££" vibration with
each revolution. Two connecting rods run to a cross bar which
is attached to the screen assembly, A steam driven turbine
equipped with a governor permits regulation of vibrations to the
most efficient speed of operation.