Plug injection method and apparatus
This patent describes an apparatus for use in launching a device plug into a well conduit. It comprises a tubular body having a central passageway and means at its opposite ends for connecting the body in pipe string; inlet means through the wall of the body to enable a fluid to be pumped through the passageway; cylinder means attached to the body and inclining upward and outward thereof, the cylinder means being adopted to receive a device that is to be moved into the passageway and down into the pipe string; piston means in the cylinder means movable from an outer position to an inner position therein for moving the device into the passageway; gate means on the cylinder means for permitting and preventing movement of the device; and remotely and selectively operable means for actuating the piston means and the gate means. This patent also describes a plug assembly for use in displacing cement or other fluid in a well conduit. It comprises upper plug means including a first tubular body having flexible seal cup members mounted thereon adapted to drive the first body down a well conduit in response to pressure, the first body having first annular seat means in the bore thereof; and lower plug means adapted to be releasably connected to the upper plug means and including a second tubular body having flexible seal cup members mounted thereon adapted to drive the second body down a well conduit in response to pressure, the second body having second annular seat means in the bore thereof. This patent also describes a method of injecting an operating device into the passageway of a body having its upper end coupled to an upper pipe member and its lower end coupled to an upper pipe member and its lower end coupled to a lower pipe member and allowing rotation of the pipe members relative to the body.
- Assignee:
- NOV; NOV-92-028004; EDB-92-101125
- Patent Number(s):
- US 5095988; A
- Application Number:
- PPN: US 7-657329
- OSTI ID:
- 5357749
- Resource Relation:
- Patent File Date: 19 Feb 1991
- Country of Publication:
- United States
- Language:
- English
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