Mechanical underground sleeve valve

A mechanical, casing valve technology that is applied in wellbore/well valve devices, wellbore/well parts, sealing/packing, etc., and can solve problems such as low reliability, bit scraping of the valve body, easy drilling, etc. problems, to achieve the effect of simple structure, reduced operation difficulty and low production cost

CN103790551AActive Publication Date: 2014-05-14BC P INC CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-05-14

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Abstract

The invention discloses a mechanical underground sleeve valve comprising a valve body, a switch tool, a protecting sliding sleeve and a valve plate. The valve body comprises an upper joint, a valve seat joint, a connection sleeve, a valve seat and a lower joint. The valve plate is hinged onto the valve seat, the protecting sliding sleeve is mounted in the valve body, the outer wall of the protecting sliding sleeve matches with the inner wall of the valve seat joint and the inner wall of the valve seat at the same time, and the lower end face of the protecting sliding sleeve is disposed on a step of the lower joint, a positioning lock is mounted on the inner wall of the connection sleeve, and a positioning groove matching with the positioning lock is mounted on the outer wall of the protecting sliding sleeve. The protecting sliding sleeve is arranged in the valve body, a conventional well cementation technology can be adopted for well cementation work, and working difficulty is reduced. An externally embedded switch sliding sleeve is adopted to be fixedly connected with a drilling tool in a shearing manner, so that during the whole process of placing the switch tool into a well, the risk of early failure of the valve resulted from that a drilling head is scrapped and elements and mechanisms in the sleeve valve are worn out is avoided.
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Description

[0001] technical field

[0002] The invention relates to the technical field of oil and gas drilling downhole tools, and is mainly used in underbalanced drilling and well completion construction operations. Background technique

[0003] During the process of underbalanced drilling, since the drilling fluid column pressure is lower than the reservoir fluid pressure, the drilling fluid will not infiltrate and pollute the reservoir, thus maximizing the protection of the reservoir and effectively increasing the single well production. At the same time, in the process of underbalanced operation, because the pressure of the drilling fluid column cannot balance the pressure of the reservoir fluid, there is a certain pressure in the wellbore. Therefore, when the drill string is lifted to the upper part of the wellbore during the tripping process, the weight of the drill string is insufficient. The drill string will be pushed out of the wellhead when it overcomes the upward force gen...

Examples

Embodiment 1

[0042] As a preferred embodiment of the present invention, the present invention discloses a mechanical downhole casing valve, which includes a valve body component, the valve body component includes an upper joint, a valve seat joint, a connecting sleeve, a valve seat and a lower joint, It also includes a protective sliding sleeve and a valve plate for opening and closing the passage in the valve body part. The valve plate is hinged on the valve seat, and the protective sliding sleeve is installed in the valve body part. The inner wall of the joint is matched with the inner wall of the valve seat, and the protective sliding sleeve can slide up and down among the valve body components. The outer wall of the sliding sleeve is provided with a positioning groove that cooperates with the positioning and unlocking.

Embodiment 2

[0044] As another preferred embodiment of the present invention, a funnel-shaped structure with a diameter-reducing step is provided on the upper inner wall of the protective sliding sleeve, and a special tool with a tapered undercut structure is provided in conjunction with the funnel-shaped structure. It is a cylindrical structure, and the extension section of the special tool is an inverted truncated cone structure. The outer diameter of the lower end surface of the inverted truncated cone structure is smaller than the inner diameter of the upper end surface of the protective sliding sleeve, and the outer diameter of the upper end surface of the inverted truncated cone structure is larger than the inner diameter of the protective sliding sleeve. Minimum inner diameter. All the other structures are with embodiment 1.

Embodiment 3

[0046] As yet another preferred embodiment of the present invention, the present invention includes valve body components, which are composed of upper and lower joints, valve seat joints, connecting sleeves, valve seats, valve plates, positioning locks and other components. The upper and lower joints can be connected with the casing through threaded buckles respectively. The lower part of the upper joint is connected with the valve seat joint. The outer thread of the lower part of the valve seat joint is connected with the upper part of the connecting sleeve. The hinge is connected with the core part of the valve body, that is, the switch valve plate, and the lower joint is connected with the lower part of the connecting sleeve through external threads. The inner wall of the connecting sleeve is provided with a positioning lock, which can play the role of positioning the switch sliding sleeve. For casing valves that are initially lowered into the well, a protective sliding sle...