| 摘要 |
The apparatus includes a mixing head forming a mixing chamber communicating with the wellbore, with the chamber having baffle means therein for creating turbulence as fluids are flowed therethrough. The mixing head is arranged for insertion into the wellbore to a position generally adjacent to the porous stratum. Three conduit means are arranged to extend down the wellbore to the mixing head for conducting A and B components of polyurethane and a mixing gas such as air. Means are provided for forcing the components and gas down the conduits to the mixing chamber at predetermined pressures and volumes whereby the components are mixed in the mixing chamber by the turbulence created by the gas and baffle means, and the mixing chamber is maintained clear of hardened polyurethane by the flow of the gas or fluid therethrough. After the polyurethane which has been deposited in the wellbore has set up, it may thereafter be drilled through, with the hardened polyurethane consolidating the lost circulation zone adjacent the wellbore.
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