Wells – Processes – Placing or shifting well part
Patent
1989-07-06
1990-06-19
Massie, IV, Jerome W.
Wells
Processes
Placing or shifting well part
166387, 166187, 166321, E21B 33127
Patent
active
049344609
ABSTRACT:
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 application 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. 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 initation of the release sequence involved in deflating the inflatable packing elements, a pressure compensating member is provided, with the member having a cylindrical outer housing and a valve housing concentrically movable relative to and within the cylindrical housing.
REFERENCES:
patent: 4648448 (1987-03-01), Sanford et al.
patent: 4805699 (1989-02-01), Halbardier
patent: 4815538 (1989-03-01), Burroughs
Baker Hughes Incorporated
Massie IV Jerome W.
Melius Terry Lee
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