| 摘要 |
A mud shearing device for placement in the mud flow line in a well drilling operation includes a series of inner pressure chambers surrounded by concentric outer chambers with jet discharge ports connecting each inner chamber with a respective outer chamber and an inlet aperture connecting each succeeding inner chamber with a preceding outer chamber. The mud flow line is connected to the first inner chamber by a flanged nipple, and mud is pumped under pressure into the first inner chamber and then sheared by discharge in a high velocity jet stream through the discharge ports into the first outer chamber and impinged against the wall surface of the outer chamber. A similar shearing mud flow is repeated through the succeeding series of inner and outer chambers and respective discharge ports to the last outer chamber which is connected by an outlet nipple to a continuation of the mud flow line where the mud continues in a conventional flow circuit in the drilling operation. Removable nozzles of various sizes can be secured in the discharge ports.
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