CN201110165Y - A double-knob plug valve for blowout prevention in drilling - Google Patents

Abstract

The utility model relates to a double-knob cock valve used for blowout prevention control of drilling tools during oil and gas drilling. It consists of valve body, upper valve seat, lower valve seat, double knob valve core, main knob and auxiliary knob. It is characterized in that the main knob and the auxiliary knob are connected through a double-knob spool; the main knob and the auxiliary knob have the same structure, are respectively located on the corresponding two sides of the cock valve housing, and the center lines are on the same axis. When the closing torque of the main knob is insufficient or the main knob fails, the auxiliary knob can be used to jointly open or close the cock valve to reduce the torque transmitted by a single knob and overcome the risk caused by insufficient switching torque or failure of the single knob cock valve. At the same time, when a single knob is turned, the other knob can provide support, reduce the switching torque of the single-knob cock valve, improve the switching effectiveness of the cock valve, increase the service life of the knob, and reduce the risk of blowout caused by oil and gas wells.

Description

A double-knob plug valve for blowout prevention in drilling

technical field

The utility model relates to a double-knob cock valve for oil and gas drilling for blowout prevention.

Background technique

The plug valve in the drilling kelly is a blowout prevention device in the drilling tool, which is mainly used in oil and natural gas drilling operations. It is usually open. When overflow or well kick occurs, turn the knob clockwise with a special wrench to drive the dial to rotate the ball valve. Closing the valve can prevent the formation fluid from being ejected upward along the water hole of the drill string. ; When the water hose and high-pressure manifold are damaged, close the device and replace it safely.

Currently known, the cock valve in the kelly for oil and gas drilling generally adopts a single-knob design and is manually closed. Practice has proved that this design and closing method has the following disadvantages: (1) The single-knob design switch torque is too large, and the hexagonal hole in the knob is worn, resulting in difficulty in closing or closing failure. ; (2) The single-knob design will cause damage to the valve core and seat due to incomplete switching, resulting in damage to the plug valve. (3) The single-knob design will cause difficulty in closing or ineffective closing due to excessive closing pressure difference and insufficient manual closing torque. These three situations will cause the risk of blowout. The usual solution is: increase the number of switch plug valves to increase the torsional force, use a crowbar, and if the knob still cannot be turned, use a hydraulic snap-off wrench. These measures often cannot solve the on-site problems. Due to the excessive switching torque, the knob is damaged, and the knob fails in advance, so that the cock valve fails prematurely.

In order to overcome the problems of the above-mentioned plug valves, the utility model proposes a double-knob plug valve for blowout prevention in drilling.

Purpose of utility model

The purpose of the utility model is to provide a double-knob cock valve for blowout prevention in well drilling. Solve the problems of the conventional single-knob design of the existing kelly cock valve, such as excessive switching torque, insufficient switching torque, easy wear of the hexagonal hole in the knob, and incomplete switching of the knob, improve the reliability of the kelly cock valve, and reduce the risk of well control.

Technical solutions

The purpose of this utility model is achieved in that the double-knob cock valve mainly consists of a valve body, a main knob, an auxiliary knob, and a double-knob spool. Turning the main knob clockwise closes the stopcock, and turning the auxiliary knob counterclockwise closes the stopcock. The main knob and the auxiliary knob are respectively located on the corresponding two sides of the cock valve housing, and the centerline of the main knob and the auxiliary knob are on the same axis; the knob holes on the double-knob cock valve housing have the same structure, and the axes are at On the same axis; the main knob and the auxiliary knob are connected through a double-knob spool.

The utility model has the advantages of:

Compared with the prior art, with this double-knob cock valve, when the closing torque of the main knob is insufficient or the main knob fails, the auxiliary knob can be used to jointly open or close the cock valve, reducing the torque transmitted by a single knob, and overcoming the single-knob cock valve switch. Risks caused by insufficient torque or single knob failure. At the same time, the auxiliary knob and the main knob are on the same axis and rotate together. When a single knob rotates, the other knob can provide support, reducing the switching torque of the single knob plug valve and improving the plug valve. The switch effectiveness is improved, the service life of the knob is improved, and the risk of blowout caused by oil and gas wells is reduced.

Description of drawings

Fig. 1 is a schematic diagram of the longitudinal section of the utility model.

Detailed ways

Further illustrate the utility model below in conjunction with accompanying drawing.

As shown in the figure, the utility model is composed of a valve body 1, an upper valve seat 2, a lower valve seat 3, a double-knob valve core 4, a main knob 5, and an auxiliary knob 6. The main knob 5 and the auxiliary knob 6 have the same structure, the direction of the knob switch is opposite, and they are respectively installed in the housing holes on the same axis.

Its working principle: The double-knob cock valve described in the utility model is connected to both ends of the kelly or the upper part of the drill pipe, and is usually in a fully open state, and the drilling fluid circulates normally in the water hole. When a kick or blowout occurs in the well and the plug valve needs to be closed, first use a special wrench or a special hydraulic wrench to turn the main knob 5 and the auxiliary knob 6 at the same time according to the mark, and rotate the spool 4 by 90° to close the plug valve. At this time, if the closing torque is not large or the personnel on site are limited, the main knob 5 can be turned first to close the cock. When the cock cannot be closed, the auxiliary knob 6 is used, and the main knob 5 and the auxiliary knob 6 are turned at the same time until the cock is closed. After the cock valve is closed, the entire water eye channel is sealed, preventing the flow of fluid in the water eye. When the cock needs to be opened, it is only necessary to rotate the main knob 5 and the auxiliary knob 6 in opposite directions.

The utility model is suitable for oil and gas drilling in the petroleum industry.

Claims (2)

1. a well drilling blowout prevention is with bispin button plug valve, be made up of valve body (1), upper valve base (2), lower valve base (3), bispin button spool (4), main knob (5), auxiliary knob (6), it is characterized in that: main knob (5) is connected by a bispin button spool (4) with auxiliary knob (6); Described main knob (5) is identical with auxiliary knob (6) structure, lays respectively at the corresponding both sides of plug valve housing, and centerline is on same axis.

2. a kind of well drilling blowout prevention according to claim 1 bispin button plug valve is characterized in that: the knob hole on the described bispin button plug valve housing (1), and structure is identical, and centerline is on same axis.

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