High Pressure Differential Switchable Kelly Plug Valve

A kelly and high-pressure differential technology, applied in the field of high-pressure differential kelly switchable kelly plug valves, can solve problems such as difficulty in operation, and achieve the effects of improving reliability, small opening torque, and reliable sealing

Active Publication Date: 2016-07-06
黑龙江北方双佳钻采机具有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: in view of the above problems, to provide a high-pressure difference switchable kelly cock valve with an improved structure to solve the defect that ordinary kelly cock valves are very difficult to operate under pressure

Method used

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  • High Pressure Differential Switchable Kelly Plug Valve

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Embodiment Construction

[0007] Such as figure 1 As shown, it includes a valve body 1, a knob 2 and a valve ball 3, the valve ball 3 is fixed in the valve body 1 through the upper valve seat 4 and the lower valve seat 5, the lower valve seat 5 is covered with a wave spring 6, the upper Both the valve seat 4 and the lower valve seat 5 are provided with an annular sealing portion 7 that contacts the valve ball 3 through an inner corner, and the lower valve seat 5 and its annular sealing portion 7 are of a split structure and are connected by threads. The spring 6 abuts against the outer end of the annular sealing portion 7 of the lower valve seat 5 . The upper valve seat 4, the lower valve seat 5 and the inner wall of the body 1 are sealed by a sealing member.

[0008] The upper valve seat 4 and its annular sealing portion 7 are separate structures and connected by threads.

[0009] A sliding thrust bearing 8 is sleeved between the inner shoulder of the knob 2 and the inner wall of the valve body 1 . ...

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Abstract

The invention discloses an openable kelly cock valve with a high pressure difference, which relates to petroleum machinery. The openable kelly cock valve comprises a valve body (1), a knob (2) and a valve ball (3), wherein the valve ball (3) is fixed in the valve body (1) by an upper valve seat (4) and a lower valve seat (5); the lower valve seat (5) is sleeved with a wave spring (6); an annular sealing portion (7) is arranged on the upper valve seat (4) and the lower valve seat (5) respectively and in contact with the valve ball (3) by an inner-side corner; the lower valve seat (5) and the annular sealing portion (7) thereof are of a split structure and in threaded connection; the wave spring (6) is abutted against the outer-side end of the annular sealing portion (7) of the lower valve seat (5). The openable kelly cock valve has the advantages of being simple in structure, reliable in sealing, and low in opening torque; manual opening is realized in case of building a pressure of 35MPa in a drilling tool, and manual rapid closing in case of a vertical tube pressure below 35MPa during overflow and well kick can be realized; the reliability of a blowout prevention operation in a wellhead and the safety of wellhead operations are improved.

Description

technical field [0001] The invention relates to petroleum machinery, in particular to a high-pressure differential switchable kelly plug valve. Background technique [0002] Kelly cock, as an important blowout prevention tool in drilling tools, has become a must in drilling and workover. Ordinary kelly plug valves have a metal elastic seat sealing structure, which adopts the sealing method of floating ball ball valves, and two-way hard seals are used between the ball and the upper and lower valve seats. There is no gap between the seat and the ball, and the contact surface is large, so the friction is very large. When the kelly plug valve is closed during operation, the valve ball is pushed to the upper valve seat by the sealing fluid pressure and pressed tightly to keep the seal; at the same time, the lower valve seat is also pressed against the valve ball under the action of spring force and fluid pressure. Tight and keep sealed. Therefore, the sealing structure of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B34/06
Inventor 王洪波孟庆辉王传德姜海成杜克忠杜野孙华
Owner 黑龙江北方双佳钻采机具有限责任公司
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