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Timing automatic ash throwing mechanism

An automatic and ash storage technology, applied in wellbore/well components, earth-moving drilling, sealing/isolation, etc., can solve the problems of high construction cost, high safety risk and high safety risk

Inactive Publication Date: 2016-03-16
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, the snubbing operation technology has been widely carried out in major domestic oilfields, but the blockage problem in the tubing has always been the technical bottleneck restricting the development of this technology. Currently, tubing plugs or tubing bridge plugs are used for plugging. In order to improve the plugging effect, To stabilize the plug, a certain amount of cement slurry needs to be covered on the upper part of the bridge plug. The conventional plugging method is opened by mechanical collision, which has low work efficiency and high safety risks.
[0003] For the cement slurry filling device in the oil pipe, domestic scholars have proposed the "Electric Release Ash Ejection Device" patent number: CN200620065535.8, the "Ash Ejector with Fixed Depth Pour Function" patent number: CN201010611230.3 and other cable transmission ash dump devices, The ash dumping operation is realized by going down to the predetermined position and detonating the opening device installed at the lower part of the ash dumping tube through the ground energization. The above ash dumping tubes all need cable transmission operations, which have high construction costs and great safety risks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The timing automatic ash throwing mechanism relates to oil, gas, and water well workover technical fields, and is mainly used for oil, gas, and water well workover operations with pressurized ash throwing operations after bridge plugs or plugs are opened, and can also be applied to well workover Regular ash throwing operations in the job.

[0038] Such as figure 1 As shown, this timing automatic ash throwing mechanism includes an ash storage part and an excitation part. The exciter 7 of the excitation part is located below the hollow piston 5 of the ash storage part. When the exciter 7 is in the state to be activated, the hollow piston 5 blocks the ash storage Part of the release port 6, when the exciter 7 is in the activated state, the hollow piston 5 moves to the upper position under the push of the high-pressure gas generated by the exciter 7, the release port 6 of the ash storage part is opened, and the cement placed in the ash storage part The slurry flows out thr...

Embodiment 2

[0041] The ash storage part in the above embodiment is composed of the pressure balance hole 2, the ash storage pipe 3, the release joint 4, the hollow piston 5, and the release port 6. The ash storage pipe 3 and the upper joint 1 are connected by threads, and the ash storage pipe 3 There is a release nipple 4 threaded at the bottom, and a hollow piston 5 is built in the hollow cavity of the release nipple 4, and a release port 6 is opened on the side wall of the release nipple 4, see figure 2 , There is a pressure balance hole 2 at the side wall above the ash storage pipe 3 .

[0042] The pressure balance hole 2 plays the role of balancing the upper and lower pressures of the ash storage pipe 3 after the release port 6 is opened, which is beneficial to the outflow of the cement slurry in the ash storage pipe 3 and completes the replacement of the liquid in the well with the cement slurry.

[0043] The structure of the hollow piston 5 is as image 3 As shown, the hollow pist...

Embodiment 3

[0048] The excitation part in the embodiment 1 is composed of an exciter 7, an excitation device 8, an excitation device base 9, and a short circuit joint 10. The excitation device 8 is fixed with an exciter 7, and the bottom of the excitation device 8 is an excitation device base 9, and the excitation device A short circuit joint 10 is connected under the base 9 , the lowest end of the short circuit joint 10 is a guide shoe 11 , and the exciter 7 is electrically connected to the short circuit joint 10 through the excitation device 8 and the base 9 of the excitation device.

[0049] The trigger 7 is a cylindrical structure, and the copper outer wall of the trigger 7 has threads for connecting with the trigger device 8, and the trigger 7 is equipped with explosives.

[0050] There is a battery compartment and a control circuit in the short circuit joint 10, wherein the control circuit is located at the upper end of the short circuit joint 10, the battery compartment is located a...

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Abstract

The invention relates to the technical field of oil, water and gas-well well repair under pressure, in particular to a timing automatic cement feeding mechanism used in the well repair under pressure process. The timing automatic cement feeding mechanism comprises a cement storage part and an excitation part and is characterized in that an exciter (7) of the excitation part is located below a hollow piston (5) of the cement storage part, the hollow piston (5) shields a release port (6) of the cement storage part when the exciter (7) is in the to-be-excited state, the hollow piston (5) moves to the upper position under driving of high pressure gases generated by the exciter (7) when exciter (7) is in the excited state and opens the release port (6) of the cement storage part, and cement pastes located in the cement storage part flow out through the release port (6), and cement feeding is completed. The timing automatic cement feeding mechanism is automatically started in timing mode at any position in a tubular column, construction cost is saved by adopting steel wire operation to replace cable operation, capacity of a cement feeding device can be increased or decreased according to the cement discharge amount, and reuse of the timing automatic cement feeding mechanism can be achieved.

Description

technical field [0001] The invention relates to the technical field of workover of oil, water and gas wells under pressure, in particular to a timing automatic ash throwing mechanism in the process of workover under pressure. Background technique [0002] In recent years, the snubbing operation technology has been widely carried out in major domestic oilfields, but the blockage problem in the tubing has always been the technical bottleneck restricting the development of this technology. Currently, tubing plugs or tubing bridge plugs are used for plugging. In order to improve the plugging effect, To stabilize the plug, a certain amount of cement slurry needs to be covered on the upper part of the bridge plug. The conventional casting method uses mechanical collision to open, which has low work efficiency and high safety risks. [0003] For the cement slurry filling device in the oil pipe, domestic scholars have proposed the "Electric Release Ash Ejection Device" patent number...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/13
Inventor 孙虎徐迎新杨红斌谢涛柳志勇
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO