Single trip wellbore cleaning and sealing system and method

A method for sealing a wellbore, comprising:

• driving a rotation of an impeller using a flow of a sealing fluid;
• using the rotation of the impeller to drive an obturation mechanism to alternately interrupt and release a flow of the sealing fluid through a fluid passage thereby generating pulses at a frequency and a pressure;
• and
• depositing the sealing fluid at a target interval, wherein the sealing fluid is solidifiable into a sealing plug at the target interval.

A plugging tool for depositing a sealing plug at a target interval of a wellbore, comprising:

• a fluid pulse generator for generating pulses of a high viscosity sealing fluid, wherein the fluid pulse generator comprises:
• an impeller driven by a flow of the sealing fluid through a housing;
• and
• an obturation mechanism driven by the impeller to generate pulses of the sealing fluid having a frequency and a pressure by alternately interrupting and releasing the flow of the sealing fluid through a fluid passage.