Inflatable packer device and method |
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| 申请号 | US3762470D | 申请日 | 1971-04-26 | 公开(公告)号 | US3762470A | 公开(公告)日 | 1973-10-02 |
| 申请人 | TENNECO OIL CO; | 发明人 | EGGLESTON J; | ||||
| 摘要 | A method and device used in freeing a pipe string stuck in the bore of a well. An inflatable packer and setting tool may be run through the string to a position just below the lowermost free connection where the packer is inflated to sealingly close the upper end of the stuck fish. The fish may then be separated from the remainder of the string. After the fish is freed from the stuck position the packer and fish are retrieved. The bouyant packer and setting tool may be positioned by a weight depending from the packer on a preselected length of wire. The packer may comprise a bladder member inflatable with fluid from the setting tool. The setting tool may comprise a piston member in a cylinder, one end of which contains the inflating fluid, the other end of which is provided with gas generating means to force the fluid into the packer. | ||||||
| 权利要求 | 1. Apparatus for use in freeing and retrieving a tubular fish stuck in the bore of a well comprising: a cylindrical packer connected to a setting tool and lowerable therewith through said well bore into the interior of said fish, said packer having a bladder member inflatable with fluid by said setting tool to sealingly close the upper end of said fish, said fluid being of a specific gravity less than the drilling fluid in said well bore so as to render said packer buoyant therein; characterized by weight means attached to said packer of a sufficient weight to overcome said buoyancy of said packer. 2. Apparatus as set forth in claim 1 in which said weight means is attached to said packer by a line, for dependence therefrom, the length of said line plus the length of said weight means and said packer being substantially equal to the length of said fish. 3. Apparatus as set forth in claim 1, characterized in that said setting tool comprises a piston member slidingly disposed in a cylinder, one end of which is in fluid communication with the interior of said bladder member, said bladder member and said one end of said cylinder being substantially filled with said fluid, the opposite end of said cylinder being provided with means for generating a force against one side of said piston to force some of the fluid in said cylinder into said bladder member to expand said bladder member for sealing engagement with the interior of said fish. 4. Apparatus as set forth in claim 3 characterized by valve means between said cylinder and said bladder member, closeable on the disconnection of said setting tool from said packer to prevent escape of fluid from said bladder member, said valve means being subsequently engageable by suitable tool means to open said valve means, permitting deflation of said bladder member and retrieval of said packer from said fish. |
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