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Well plugging device and method

A technology for closing wells and well sections, applied in the field of oilfield equipment, can solve problems such as high cost and low work efficiency

Inactive Publication Date: 2017-11-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a well sealing device, which solves the problems of low working efficiency and high cost of the existing sealing technology

Method used

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  • Well plugging device and method
  • Well plugging device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The sealing device provided in this embodiment can be applied in the sealing process of oil and gas wells, and is used for sealing the well section in the well that needs to be sealed. The sealing device provided in this embodiment can be directly lowered into the production The well sealing is carried out in the tubing of the string, and the production string does not need to be pulled out when the well is sealed.

[0033] figure 1 It is a structural schematic diagram of the sealing device of the present invention, figure 2 It is a schematic diagram of the sealing device of the present invention in the production tubing, as figure 1 As shown, the sealing device includes: coiled tubing 10, a control valve 30 and a flushing head 40, wherein the two ends of the control valve 30 are connected to the coiled tubing 10 and the flushing head 40 respectively, that is, one end of the control valve 30 is connected to the coiled tubing 10 , the other end of the control valve 30...

Embodiment 2

[0051] The well sealing method provided in this embodiment specifically adopts the well sealing device 100 of any of the above-mentioned embodiments to perform well sealing, image 3 It is a schematic flow sheet of the well sealing method of the present invention, specifically, as image 3 As shown, the sealing method comprises the steps:

[0052] Step 101, running a well sealing device into the tubing of the production string in the well to the well sealing section.

[0053] In this embodiment, firstly, the well sealing device 100 is lowered into the tubing 200 of the production string in the well, and then down to the well section that needs to be plugged. If the weight changes, stop the lowering of the sealing device 100 if it encounters resistance, and try to lift the sealing device 100 .

[0054] Step 102, inject well flushing fluid into the coiled tubing of the sealing device, and perform circular flushing to reduce the temperature in the well.

[0055] In this embodi...

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Abstract

The invention provides a well plugging device and method. The well plugging device comprises a continuous oil pipe, a control valve and a flushing head, wherein two ends of the control valve are respectively connected with the continuous oil pipe and the flushing head; the continuous oil pipe communicates with the flushing head via the control valve; the control valve controls liquid or slurry liquid in the continuous oil pipe to enter the flushing head in a single direction; and the flushing head can discharge the liquid or the slurry liquid in the continuous oil pipe. The well plugging device can solve problems of low work efficiency and high cost of the well plugging technology.

Description

technical field [0001] The invention relates to the technical field of oilfield equipment, in particular to a well sealing device and a well sealing method. Background technique [0002] In the later stage of oil and gas well production, wells with depleted production or high water content need to be sealed with cement plugs. [0003] At present, the commonly used sealing method is as follows: the production tubing string in the well needs to be pulled out by the workover rig on the well, and then the drill pipe string with the drill bit is lowered, and the drill bit on the drill string is passed to the well. At the bottom of the well, after pulling out the drill pipe string, run the smooth drill pipe string, drive cement slurry downhole through the light drill pipe string, block the production well section, and lift the smooth drill pipe string to the cement slurry at the same time Above, after the cement slurry is ready to set (according to the solidification test equippe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B21/00E21B36/00
CPCE21B21/00E21B33/13E21B36/001
Inventor 周建平高永梅
Owner PETROCHINA CO LTD