HIGH SIGNAL STRENGTH MUD SIREN FOR MWD TELEMETRY
A measurement while drilling (MWD) tool includes a sensor, an encoder operably connected to the sensor and a modulator operably connected to the encoder. The modulator includes a first stator, a rotor and a second stator. The rotor is optimally positioned between the first and second stator. The use of a second stator amplifies the pressure pulse signal produced by the modulator.
1 . A drilling tool comprising:
a sensor;
an encoder operably connected to the sensor; and
a modulator operably connected to the encoder, wherein the modulator comprises:
a first stator;
a rotor; and
a second stator.
2 . The drilling tool of claim 1 , wherein the rotor is positioned between the first stator and the second stator.
3 . The drilling tool of claim 1 , further comprising a generator.
4 . The drilling tool of claim 1 , wherein the first stator includes a plurality of stator vanes and wherein the second stator includes a plurality of stator vanes.
5 . The drilling tool of claim 1 , wherein the first stator is offset in position from the second stator such that the stator vanes on the first stator are not aligned with the stator vanes on the second stator.
6 . The drilling tool of claim 1 , wherein the rotor includes a plurality of rotor vanes.
7 . The drilling tool of claim 1 , wherein the rotor vanes are pitched.
8 . A modulator for use with a drilling tool encoder, the modulator comprising:
a first stator;
a rotor; and
a second stator.
9 . The modulator of claim 8 , wherein the rotor is positioned between the first stator and the second stator.
10 . The modulator of claim 8 , wherein the first stator includes a plurality of stator vanes and wherein the second stator includes a plurality of stator vanes.
11 . The modulator of claim 8 , wherein the first stator is offset in position from the second stator such that the stator vanes on the first stator are not aligned with the stator vanes on the second stator.
12 . The modulator of claim 8 , wherein the rotor includes a plurality of rotor vanes.
13 . The modulator of claim 8 , wherein the rotor vanes are pitched.
14 . A drilling system adapted for use in drilling a subterranean well, the drilling system comprising:
a drill string;
a drill bit; and
a measurement while drilling (MWD) tool positioned between the drill string and the drill bit, wherein the measurement while drilling tool comprises:
a sensor;
an encoder operably connected to the sensor; and
a modulator operably connected to the encoder, wherein the modulator comprises:
a first stator;
a rotor; and
a second stator.
15 . The drilling system of claim 14 , wherein the measurement while drilling tool comprises:
a motor; and
a shaft connected to the motor and to the rotor.
16 . The drilling system of claim 15 , wherein the rotor is positioned between the first stator and the second stator.
17 . The drilling system of claim 16 , wherein the first stator includes a plurality of stator vanes and wherein the second stator includes a plurality of stator vanes.
18 . The drilling system of claim 17 , wherein the first stator is offset in position from the second stator such that the stator vanes on the first stator are not aligned with the stator vanes on the second stator.
19 . The drilling system of claim 18 , wherein the rotor includes a plurality of rotor vanes.
20 . The drilling system of claim 19 , wherein the rotor vanes are pitched.