E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/65
E21B 33/12 (2006.01)
Patent
CA 2018366
PRESSURE COMPENSATING APPARATUS AND METHOD FOR CHEMICAL TREATMENT OF SUBTERRANEAN WELL BORES ABSTRACT OF THE DISCLOSURE An apparatus for effecting chemical treatment of a subterranean well bore comprises vertically spaced, inflatable packing elements which are run into the well on a fluid conduit, such as continuous coiled tubing, or the like. The apparatus permits circulation while being run into the well and, when positioned, 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 relative to an outer body, which 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 ap- plication of a treatment fluid. The same movement, accompanied by an increase in fluid pressure effects the opening of a fluid path to the well bore above the uppermost packing element. The pressurizing 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. In order to compensate for a pressure variance as a result of the initiation of the release sequence involved in deflating the inflatable packing elements, a pres- sure compensating member is provided, with the member having a EXPRESS MAIL NO. B76921555 cylindrical outer housing and a valve housing concentrically movable relative to and within the cylindrical housing. A fluid flow passageway is within the valve housing and extends to the top of the well. Valve head and seat means are carried by the housing for selective blocking of fluid flow in one direction through the passageway when the valve head and seat means are in a first relative position and permit fluid flow in that direction through the valve housing when the valve head and seat means are in a second relative position. A pressure chamber is provided within the outer housing and extends to the lowermost side of the valve head means. Biasing means are provided for biasing the valve housing to contract the pressure chamber with the biasing means being energized by a decrease of pressure within the fluid supply conduit such that the valve housing is moved relative to the outer housing to expand the pressure chamber without movement of the valve head means relative to the valve seat means. The compensating valve mem- ber may also be used independent of the inflatable apparatus either alone or in combination with another auxiliary tool within the subterranean well. -2-
Baker Hughes Incorporated
Smart & Biggar
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