SU1571211A1 - Valve for core dredger - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to mining and is intended for core drilling. The goal is to increase reliability. The valve includes a housing 1 with a socket 2 and a saddle in its lower part, a locking ball 3 and an elastic diaphragm 4 with a hole and a reinforcing elastic element 5 that restricts the movement of the ball. In the nest 2 there is an elastic sheath 7 with a figured closed cavity 8 filled with a viscous seat fluid. The edge of the diaphragm opening is made with reinforced teeth 6. With increasing pressure in the cavity of the core tube, the ball 3 rises with the flow of drilling fluid, reaching the teeth 6. The upward flow of drilling fluid leaves the cavity of the valve, flowing between the teeth 6. the drill pipe ball 3 quickly sits in the nest 2. Due to this, a small part of the drilling fluid pumped to the bottom is introduced into the cavity of the core-receiver pipe. 3 il.

Description

The invention relates to mining, in particular to devices for drilling wells with coring.

The purpose of the invention is to increase reliability.

Figure 1 shows the valve in the working position, a longitudinal section; . FIG. 2 is the same with negative differential pressure; FIG. 3 shows the placement of the valve in a double column end (the arrows indicate the direction of movement of the drilling fluid).

 The valve includes a housing 1 with a socket 2 and a saddle in its lower part under the locking ball 3. A balloon is placed above the ball 3

diaphragm 4 is elastic with a reinforcing elastic element 5 and with reinforced teeth 6 on the edge of the hole,

An elastic sheath 7 with a figured closed cavity 8 filled with a viscous fluid through the opening 9 is placed in the nest 2 and on the saddle

The shell 7 and the diaphragm 4 are held in the housing I by a nut 10,

The valve operates as follows

The valve is lowered to the bottom as a part of the coring slug, but without ball 3. After setting the projectile to the bottom by pumping the drilling fluid, the cavity of the core tube is cleared of sludge. Then into the cavity of borilsp 1

to

The pipes 3 lower the ball 3, which sits in the socket 2, closing the cavity of the core tube from the downward flow of drilling mud. In this case, the shell 7 encloses the ball under the action of pressure on the viscous fluid in the cavity 8. Due to this, the contact surface of the ball 3 with the shell 7 is enlarged and the degree of sealing of the cavity of the core-receiver tube is proportional to this.

With increasing pressure in the cavity of the core tube Ball 3, the flow of drilling fluid rises to reach the teeth 6 of the diaphragm 4. The upward flow of drilling fluid leaves the valve cavity, the flow between the teeth 6 and the ball 3, rapidly.

It sits in the nest 2. Due to this, a small part of the mud pumped to the bottom of the drilling fluid gets into the cavity of the core tube.

Claims (1)

Invention Formula The valve for coring projectile, comprising a housing with a seat and a saddle in its lower part, a stop ball, and an elastic diaphragm with a hole and a reinforcing elastic element restricting the movement of the ball, in order to increase reliability, it is provided with in the nest and on the saddle, an elastic shell with a figured closed cavity filled with a viscous liquid, while the edge of the aperture of the diaphragm is made with reinforced teeth. Fig 2. Phage.Z