Dual-flap-valve type downhole safety valve

A safety valve, flap valve technology, applied in wellbore/well components, wellbore/well valve device, earth-moving drilling, etc. Ensure continuous production, reliable sealing and high thrust

Active Publication Date: 2015-04-08
BAOJI PETROLEUM MASCH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a double disc valve type downhole safety valve, which solves the problem that the downhole saf

Method used

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  • Dual-flap-valve type downhole safety valve
  • Dual-flap-valve type downhole safety valve
  • Dual-flap-valve type downhole safety valve

Examples

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Embodiment Construction

[0027] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0028] Reference figure 1 , Is a schematic diagram of the working state of the present invention in offshore oil and gas exploitation. The (horizontal) underwater Christmas tree 15 is placed on the subsea wellhead, and the tubing hanger with the production pipe string 18 is placed inside the underwater Christmas tree 15 The downhole safety valve 17 is arranged in the inner cavity of the production pipe string 18 and constitutes a part of the pipe string. The control pipeline 16 of the downhole safety valve 17 is connected upwards to the underwater control module in the underwater Christmas tree 15, and then realized by ground operation Control of the entire system.

[0029] Reference figure 2 , image 3 , The structure of the device of the present invention is to include an outer shell formed by connecting the upper sub section 1, the middle sub section 5 and t...

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Abstract

The invention discloses a dual-flap-valve type downhole safety valve which comprises an outer shell formed by sequentially connecting an upper short piece, a middle short piece and a lower short piece, wherein the inner cavity of the middle short piece is provided with a spring; the inner cavity of the upper short piece is provided with a piston pipe; the piston pipe is of a cylinder structure; the pipe wall of the upper short piece is internally provided with at least two plunger holes for mounting plungers along an axial direction; the upper ends of the plunger holes are connected with the outside by virtue of a hydraulic pipeline joint; each plunger hole is internally provided with a group of plunger assemblies; the lower opening of the middle short piece is connected with an upper valve base by virtue of threads; an upper flap valve is arranged below the upper valve base; the convex shoulder of the inner cavity of the lower short piece is connected with a lower valve base by virtue of threads, and a lower flap valve is arranged below the lower valve base is provided with. According to the dual-flap-valve type downhole safety valve, a dual-flap-valve structure is adopted and the two plungers are adopted for driving, so that double shut of downhole pressure is realized, the dual-flap-valve type downhole safety valve is simple in structure and reliable in operation.

Description

Technical field [0001] The invention belongs to the technical field of oil and gas equipment, and relates to a double flap valve type downhole safety valve. Background technique [0002] The downhole safety valve is one of the downhole tools installed on the oil and gas field completion production string. The main function of the downhole safety valve is to automatically close the production string in time to prevent accidents in the event of fire, blowout, pipeline rupture and other emergency situations. Development or further expansion. [0003] Downhole safety valves have broad application prospects, high technical difficulties, and high added value of products. Domestically, all offshore oil and gas wells and some high-risk and high-yield oil and gas wells on land must be equipped with downhole safety valves. [0004] The existing downhole safety valves have a single structure, which are basically single plunger, single flap valve or central pipe piston safety valves. They have ...

Claims

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Application Information

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IPC IPC(8): E21B34/06
CPCE21B34/08
Inventor 赵旭东刘文霄邓平金连登田阳
Owner BAOJI PETROLEUM MASCH CO LTD
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