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Bevel unloading low-opening-fore square drilling rod plug valve

A kelly and plug valve technology, which is used in earth-moving drilling, wellbore/well valve device, wellbore/well components, etc. big problem

Inactive Publication Date: 2015-07-29
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above problems have been solved to a certain extent, there are still some problems, such as the polymer materials used are prone to creep, sediments block the pressure relief channel and reduce the life of the plug valve, or the pressure difference between the two ends of the valve ball is large. , when the plug valve is opened, although the pressure of the liquid acting on the valve ball is converted to the wedge body, it is also converted to the rotary rod and the connecting rod. The axial force must not only overcome the frictional moment between the wedge body and the liquid Pressure component, but also to overcome the friction and friction torque between the rotary rod and the valve body, so the torque when opening is also relatively large

Method used

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  • Bevel unloading low-opening-fore square drilling rod plug valve
  • Bevel unloading low-opening-fore square drilling rod plug valve
  • Bevel unloading low-opening-fore square drilling rod plug valve

Examples

Experimental program
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Effect test

Embodiment Construction

[0016] The present invention will be further described below in conjunction with accompanying drawing:

[0017] attached by figure 1 It can be seen that the plug valve includes a valve body (1), a lower valve seat (2), a valve ball (3), a lower half ring (4), a wedge (5a) (5b), a fixing screw (6a) (6b) ), block cover (7a) (7b), adjusting screw (8a) (8b), connecting rod (9a) (9b), upper half ring (10), retaining ring (11), wedge-shaped upper valve seat (12) , wave spring (13), knob (14), valve sleeve (15) and wave spring (16) etc. The knob (14) is connected together with the valve ball (3) through the groove on the valve ball (3). Under the valve ball (3) is the lower valve seat (2), under the action of the wave spring (16), the lower valve seat (2) and the valve ball (3) are closely fitted, and the lower valve seat (2) is seated above the step of the valve body (1). On the top of the valve ball (3) are the lower half ring (4), the wedge-shaped upper valve seat (12), the we...

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PUM

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Abstract

The invention provides an inner blowout preventing tool for a dirlling machine, specifically provides a square drilling rod plug valve with a novel structure, an aims at solving the problem of wear of the sealing surface caused by failure of opening of the plug valve and large frictional force due to large pressure difference of a pipe column and large contact pressure of the sealing surface. The plug valve is that the main torque for opening the plug valve is converted into transmission torque between thread pairs and then is introduced into a wedge block, so that the force acting on a valve ball is greatly reduced; the plug valve can be opened with small torque under the spiral transmission type amplifying effect. With the adoption of the plug valve, the torque for opening the plug valve can be effectively reduced, the frictional force of the contact surface can be reduced, and the service life of the plug valve can be prolonged.

Description

technical field [0001] The patent of the present invention relates to a blowout prevention tool in a drilling tool in a well control device for petroleum drilling, in particular to a kelly cock valve. Background technique [0002] The Kelly plug valve is a blowout prevention tool inside the drilling tool, and it is one of the blowout prevention tools required by the well control technical specification. Kelly cock valves are divided into upper kelly cock valves and lower kelly cock valves. The upper kelly cock is connected between the swivel and the kelly, and the lower kelly cock is connected between the kelly and the drill pipe. The Kelly plug valve is easy to operate, and it can be opened or closed by using a special wrench to rotate 90° according to the instruction. During drilling and workover operations, in order to avoid the occurrence of blowout incidents, the specification requires installation of kelly plug valves at the upper and lower ends of the kelly. [000...

Claims

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Application Information

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IPC IPC(8): E21B34/06
CPCE21B34/06
Inventor 何东升贾礼霆梁志彬卢玲玲
Owner SOUTHWEST PETROLEUM UNIV
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