| 摘要 |
<p>A mixing valve for use in cementing, fracturing or other treatment of a well. The valve, which may be mounted in a pipe string, comprises a center mandrel surrounded by a coaxial housing having circumferentially spaced apertures therethrough. A packer cup surrounds the center mandrel below the apertures in the housing, and seals the annulus between the mandrel and housing when the pressure of fluid through the bore of the mandrel exceeds that on the outside of the chamber. When mixing fluids, it is only necessary to pressure the fluid outside the housing to collapse the packer cup against the mandrel, the fluid from the outside then entering the stream flowing from the mandrel bore. A method of mixing fluids utilizing the valve of the present invention is also disclosed.</p> |
