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Oil well plugging device

A plugging device and oil well technology, applied in sealing/isolation, wellbore/well parts, earthwork drilling and production, etc., can solve problems such as difficulty in opening wells, easy absorption of wellbore by killing fluid, and cold damage to oil layers, etc., to avoid Killing operation, improving the effect of steam huff and puff, and improving the effect of steam heat utilization

Inactive Publication Date: 2013-02-06
SHAANXI ALLIANCE LOGISTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, heavy oil reservoirs in some oilfields are mainly developed by steam huff and puff. After steam injection in heavy oil wells, well killing operations are required to prevent oil and water upwelling during pumping operations, formation energy reduction, and pollution of the surrounding environment. However, once the well killing operation is carried out, on the one hand, the well killing fluid can easily absorb the heat around the wellbore, lower the temperature in the near wellbore area, cause cold damage to the oil layer, and make it difficult to start the well after pumping, and on the other hand, it is easy to kill the oil well. Well fluids are also easy to cause pollution to oil layers, which is especially serious for water-sensitive heavy oil reservoirs
In addition, the well killing operation after steam injection is easy to damage the casing

Method used

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  • Oil well plugging device

Examples

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Effect test

Embodiment 1

[0011] An oil well plugging device, a pipe string is arranged inside the casing, a switch connection device 1 and a connecting rod 3 are arranged in turn above the pipe string, the connecting rod 3 is movable inside the switch connection device 1, and the lower part of the connecting rod 3 passes through the spring 2 is connected with the pipe column, and the lower part of the switch connection device 1 is open, and its cross-sectional area is larger than that of the spring column 2.

[0012] Under normal conditions, the spring column 2 is in the released state, and the connecting rod 3 seals the spring column 2 on the switch connection device 1, which can effectively prevent the well fluid from gushing. When gas injection is required, the gas pours in from the upper connecting rod 3 , the spring column 2 is tightened under the action of atmospheric pressure, and the gas flows from the switch connection device 1 into the well.

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Abstract

The invention relates to a plugging device, in particular to an oil well plugging device for sealing a wellhead. The oil well plugging device comprises a casing pipe, a pipe column is arranged inside the casing pipe, a switch connecting device and a connecting rod are sequentially arranged above the pipe column, and the connecting rod is movably arranged inside the switch connecting device which is fixedly arranged inside the casing pipe. The oil well plugging device is capable of achieving opening and closing of the pipe column by the aid of a spring column, simple in structure, highly practical and capable of achieving industrial production.

Description

technical field [0001] The invention relates to a plugging device, in particular to a wellhead sealing device. Background technique [0002] At present, heavy oil reservoirs in some oilfields are mainly exploited by steam huff and puff. After steam injection in heavy oil wells, well killing operations are required to prevent oil and water upwelling during pumping operations, formation energy reduction, and pollution of the surrounding environment. However, once the well killing operation is carried out, on the one hand, the well killing fluid can easily absorb the heat around the wellbore, lower the temperature near the wellbore, cause cold damage to the oil layer, make it difficult to start the well after pumping, and on the other hand, it is easy to kill the oil well. The well fluid is also easy to cause pollution to the oil layer, which is especially serious for water-sensitive heavy oil reservoirs. In addition, the well killing operation after steam injection is easy to...

Claims

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Application Information

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IPC IPC(8): E21B33/03
Inventor 王耀斌
Owner SHAANXI ALLIANCE LOGISTICS
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