| 摘要 |
METHOD AND APPARATUS FOR CHEMICAL TREATMENT OF SUBTERRANEAN WELL BORES An apparatus for effecting chemical treatment of any selected portion of a subterranean well bore comprises a pair or vertically spaced, inflatable packing elements which are run into the well on a fluid conduit, such as continuous tubing. The apparatus permits circulation while being run into the well bore and, when positioned at a desired location, effects the expansion of the two inflatable elements by pressured fluid introduced through the supporting fluid conduit. The applied pressure is trapped within the inflatable elements by axial movement of an inner body assemblage of the apparatus relative to an outer body assemblage, which is opposed by a string. The relative movement effects the opening of fluid communication between the central fluid conduit and the well bore portion between the inflated packing elements, permitting testing of the sealing effectiveness of the packing elements, and the application of a treatment fluid. The same movement, accompanied by an increase in fluid pressure supplied through the fluid supply conduit, effects the opening of a fluid path to the well bore above the uppermost packing element. The pressurizing and/or testing fluid remaining in the fluid supply conduit may be discharged into the well annulus by supplying pressurized treatment fluid through the supply conduit. For deflation of the inflatable packing elements, the central body is moved downwardly by the spring, a circulation port is opened and a rupture disc is ruptured through the application of preselected higher fluid pressures, thus permitting drainage of fluid from the inflatable elements and circulation as the tool is withdrawn from the well. EXPRESS MAIL NO. B76921561
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