IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0128798
(1980-03-10)
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발명자
/ 주소 |
- Harris Monty E. (Cleveland OK)
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| 출원인 / 주소 |
- The Dow Chemical Company (Midland MI 02)
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| 인용정보 |
피인용 횟수 :
36 인용 특허 :
0 |
초록
▼
A cementing head is disclosed, which is particularly designed for injecting an omega-type cementing plug into a well casing. Prior to cementing, the plug is retained in a housing. Located above the plug is a movable plunger, actuated by an operating fluid, such as hydraulic fluid. Below the plug is
A cementing head is disclosed, which is particularly designed for injecting an omega-type cementing plug into a well casing. Prior to cementing, the plug is retained in a housing. Located above the plug is a movable plunger, actuated by an operating fluid, such as hydraulic fluid. Below the plug is a control valve. When the valve is closed, it prevents any accidental downward movement of the plug into the well casing. Following injection of the cement slurry into the casing, the valve is opened, and the plunger is moved down to push the plug through the valve and beyond the cement inlet. A fluid such as water is passed through the cement inlet, under pressure, to push the plug down the casing behind the cement slurry.
대표청구항
▼
A cementing head apparatus for injecting a cementing plug into a well casing, the apparatus comprising: means defining a fluid chamber having top and bottom ends, the chamber being adapted to contain an operating fluid; means defining a fluid inlet, in communication with the inside of the fluid cham
A cementing head apparatus for injecting a cementing plug into a well casing, the apparatus comprising: means defining a fluid chamber having top and bottom ends, the chamber being adapted to contain an operating fluid; means defining a fluid inlet, in communication with the inside of the fluid chamber and a source for the operating fluid, said inlet being adapted to carry the operating fluid into the fluid chamber; a plug housing having top and bottom ends, the top end being coupled into the bottom end of the fluid chamber, the plug housing being adapted for retaining a cementing plug; a plunger, the plunger being positioned inside the fluid chamber, and the plunger being movable in said chamber, by the action of the operating fluid, between a rest position and an extended position; a valve housing having top and bottom ends, the top end being coupled into the bottom end of the plug housing; and the bottom end being coupled into the well casing; a control valve having a bore therein, said valve being installed inside the valve housing, and the valve being movable in the housing between a closed position and an open position; a cement inlet, mounted on the valve housing below the control valve, coupled into a source for a cement slurry, and adapted for carrying the slurry into the valve housing; wherein, the wiper plug is adapted to be pushed through the valve bore by the plunger, by moving the control valve to its open position and moving the plunger to its extended position. Method for injecting a cementing plug into a well casing behind a cement slurry, the method comprising the steps of: positioning a cementing plug in the plug housing of a cementing head apparatus; injecting a predetermined amount of a cement slurry into the well casing through a cement inlet positioned in a valve housing, the valve housing being installed in said apparatus below the cementing plug; opening a control valve installed in the valve housing; directing an operating fluid against a movable plunger installed in a fluid chamber positioned in said apparatus above the cementing plug; causing the plunger to move into contact with the cementing plug; further moving the plunger, by the action of the operating fluid, to cause it to push the cementing plug through the open control valve and into a position below the cement inlet.
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