Vibrator sub
A vibrator tool for use in inserting a bottom hole assembly into a wellbore. The vibrator tool includes a substantially cylindrical body, a motor within the substantially cylindrical body, and a non-linear shaft attached to the motor so that the motor turns the non-linear shaft. The non-linear shaft extends outwardly from the motor within the substantially cylindrical body. The vibrator tool further includes a bearing attached to the shaft a predetermined distance from the motor so that the bearing rotates as the non-linear shaft turns. The bearing contacts portions of the inner surface of the cylindrical body as the non-linear shaft turns, thereby vibrating the substantially cylindrical body.
1. A vibrator tool for use in inserting a bottom hole assembly into a wellbore, the vibrator tool comprising:
a substantially cylindrical body;
a motor within the substantially cylindrical body;
a non-linear shaft attached to the motor so that as the motor turns the non-linear shaft, the non-linear shaft extends outwardly from the motor within the substantially cylindrical body; and
a bearing attached to the shaft a distance from the motor so that the bearing rotates as the non-linear shaft turns, the bearing contacting portions of the inner surface of the cylindrical body as the non-linear shaft turns, thereby vibrating the substantially cylindrical body;
wherein the substantially cylindrical body has longitudinal slots therein that are positioned to contact the bearing as the bearing rotates so that contact between the bearing and the slots amplifies the vibration of the vibrator tool.
2. The vibrator tool of claim 1 , wherein the motor turns the shaft at a rate of about 1000-2000 revolutions per minute.
3. A vibrator tool for use in inserting a bottom hole assembly into a wellbore, the vibrator tool comprising:
a substantially cylindrical body;
a motor attached to the cylindrical body;
a substantially circular gear that rotates and that is driven by the motor; and
a weight attached to the gear at a position off-center relative to the center of the gear, so that when the gear rotates the off-center attachment of the weight causes the motor and the cylindrical body to vibrate, wherein the weight is outside of, and spaced apart from, a center of rotation of the gear.
4. A method of inserting logging equipment into a wellbore, the method comprising the steps of:
inserting a bottom hole assembly attached to coiled tubing into a wellbore, the bottom hole assembly including a vibrating tool, the vibrating tool comprising:
a substantially cylindrical body;
a motor within the substantially cylindrical body;
a non-linear shaft attached to the motor so that the motor turns the non-linear shaft, the non-linear shaft extending outwardly from the motor within the substantially cylindrical body; and
a bearing attached to the shaft a predetermined distance from the motor so that the bearing rotates as the non-linear shaft turns, the bearing contacting portions of the inner surface of the cylindrical body as the non-linear shaft turns, thereby vibrating the substantially cylindrical body;
wherein the substantially cylindrical body has longitudinal slots therein that are positioned to contact the bearing as the bearing rotates so that contact between the bearing and the slots amplifies the vibration of the vibrator tool;
lowering the bottom hole assembly through a vertical part of the wellbore;
pushing the bottom hole assembly through a deviated part of the wellbore using the tubing; and
vibrating the bottom hole assembly and tubing with the vibrating tool to reduce friction between the bottom hole assembly and tubing, and the wellbore.
5. The method of claim 4 , wherein the bottom hole assembly includes more than one vibrating tool.
6. The method of claim 4 , further comprising:
adjusting the distance of the bearing from the motor to increase or decrease vibration.
7. The method of claim 4 , further comprising:
adjusting the weight of the bearing to increase or decrease vibration.