Echometer Company
Model – M Manual
Phone: (940) 767-4334
5001 Ditto Lane
Page
9
Fax: (940) 723-7507
Wichita Falls, Texas 76302, U.S.A.
E-Mail:•
Battery Charger Connector
Attaching the 110 VAC or the 220 VAC battery charger or the 12V-car battery power cable to this connector
charges the built-in battery.
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Test Connector and Test Switch (on units serial number 4999 and below only.)
This TEST connector should be attached to the INPUT connector using the coaxial cable in order to check
that the instrument and the coaxial cable are operating correctly. Depressing the test switch applies a test
signal to the input of the amplifier via the TEST connector and the coaxial cable.
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Chart Paper Drive
Pushing the spring-loaded aluminum plate cover towards the right and lifting it from the left side accesses the
chart paper. The paper is dropped into the cavity so that it unrolls counter-clockwise. After inserting the
paper roll, the aluminum cover is replaced. The printed Echometer logo on the paper should face up since
only this side of the paper is heat sensitive. The heat sensitive paper supplied by Echometer Company
operates over a wide temperature range and is made for the Echometer Chart drive system. The chart drive
has a paper sensor to determine when paper exists in the drive. If the sensor detects that paper is not present,
power is not supplied to the printhead. If paper is not present in the drive system and power is supplied to the
printhead, the printhead will be damaged because the small heating elements in the printhead will be
overheated. Using paper that is not of the proper width may result in printhead failure. Use only Echometer
paper to insure proper operation of the printhead and chart drive system.
Wellhead Attachments
Compact Gas Gun
The Compact Gas Gun consists of a microphone and a ten cubic inch volume chamber with a ¼” outlet
valve. The outlet valve will open rapidly when the trigger is pulled. This generates a pressure pulse. If
the pressure is greater in the volume chamber than in the casing annulus, a compression pulse is
generated. If the pressure is greater in the casing annulus than in the volume chamber, a rarefaction
pulse is created. A differential pressure must exist between the volume chamber and the casing annulus
for a pressure pulse to be generated. The operator has the choice of using an explosion or implosion
pulse.
Compression (Explosion) Pulse
Explosion utilizes an external gas supply to generate an acoustic pulse in the well. In the explosion
mode, the volume chamber is charged from an external gas supply to a pressure in excess of the well
pressure. Operating in the explosion mode keeps the inside of the chamber cleaner and results in less
maintenance.
Rarefaction (Implosion) Pulse
If the well’s casing pressure is greater than 200 PSI, implosion can be used. This method uses the
well’s pressure to generate a pulse. Use the gas gun filler/bleed valve to release gas from the volume
chamber. An external gas supply is not necessary to operate in the implosion mode. Operation in this
mode forces sand, moisture and other debris into the gas gun volume chamber and thus requires more
maintenance including frequent replacement of “O” rings.
Description of Compact Gas Gun Control Functions (refer to drawing)