Patent ID: 8997855
Filing Date: 2015-04-07
Classification: E21B

Abstract:
1. A method for deforming a wellbore tubular in a wellbore, comprising: urging a body into engagement with the wellbore tubular to apply a static force to the wellbore tubular; connecting an ultrasonic vibration device to the body with a connector; generating a specified dynamic force by applying a vibration to the body with the vibration device via the connector, wherein the body resonates by diametrically expanding and contracting in response to the vibrations applied by the vibration device, wherein the vibration device includes a transducer stack, and a function generator applying a driving signal to the transducer stack; oscillating the transducer stack at a fraction of a resonant frequency of the body to cause the body to resonate at a resonant frequency; selecting a mass of the body and a frequency of the vibration to generate the specified dynamic force; and expanding the wellbore tubular by applying the specified dynamic force and the static force to the wellbore tubular, the specified dynamic force and the static force cooperating to cause a substantially constant relative motion between the body and the wellbore tubular.