SU1317091A1 - Damper of torsional oscillations of drilling tool - Google Patents

Abstract

The invention relates to the field of drilling wells and allows to increase work efficiency by preventing jamming of the drilling tool. The damper includes a hollow body 1 with internal protrusions and openings for communication of its cavity with the annulus. Concentric to the housing 1 is a hollow shaft 2 with blades 3, which form the discharge cavities (NP) 5 with the projections of the housing 1. They are connected to the cavity of the shaft 2 by means of the upper 6 and lower 7 windows formed in the shaft 2 and the blades x 3. Between the windows 6 and 7, shaft 2 has a septum 8, and an adjusting valve (K) is installed at its lower end. The windows 6 are equipped with return plate K 9. During the operation of the damper, the washing fluid through the cavity of shaft 2, windows 6 and 7, NP 5, K 9 and And enters the column tube. Torsional vibrations occur, turning the casing 1. At the same time, the pressure in the NP 5 increases and the liquid is thrown through the windows 7 into the core pipe. As a result, the tool is raised at excessive torques. Further, under the action of the pressure of the fluid in the NP 5, the housing 1 returns to its original position. 3 il I (L with isha. About with

Description

The invention relates to the drilling of wells and can be used in the core drilling.

The purpose of the invention is to increase the efficiency of the torsional vibration damper by preventing the drilling tool from jamming.

FIG. 1 shows a damper, section; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one.

The torsional and oscillation damper includes a hollow body 1, a hollow shaft 2 centrally located to it with blades 3 forming oscillatory cavities 5 with the inner projections 4 in the housing 1. Shaft 2 and blades 3 are made with the upper 6 and lower 7 windows, I call Zimi injection cavities 5 with the cavity of the shaft 2, and the shaft has a partition 8 located between the top 6 and bottom 7 windows. The upper windows 6 of the blades 3 are equipped with non-return flap valves 9, reinforced with rivets 10. At the bottom, at the bottom end of the shaft 2, under the discharge cavity 5, an adjusting valve 11 is installed with a regulating nut 12 and a spring 13. The shaft is in support sub-bodies 14 and 15, tightened with clamping nuts 16 and 17.

The thread in the upper part of the shaft 2 is intended for connection with the drill string. The connection to the core pipe is made by means of an adapter 18. The movable connections of the damper have gland seals 19.

Torsional vibration damper works as follows.

Flushing fluid flows from the drill pipe into the upper cavity of shaft 2 and through windows 6 with valves 9 onto blades x 3 into the discharge cavities 5. Next, from cavities 5 the liquid flows through lower windows 7 of blades 3 into the lower cavity of shaft 2 and then through the adjusting valve 11 passes the EI cavity of the adapter 18 and further into the core pipe. A partition 8 in the cavity of the shaft 2 prevents the flow of fluid into the column tube.

When torsional vibrations occur, the housing 1 rotates with respect to the shaft 2 with the blades 3. The pressure in the cavities 5 increases with the ejection of fluid through the lower windows 7 and the control valve 11 into the core pipe. The increase in pressure in cavity 5 causes damping, i.e., smooth rotation of body 1 relative to shaft 2.

The required fluid pressure in the cavity 5 is maintained by means of an adjusting valve 11 with a regulating nut 12 and a spring 13.

At high frequencies of rotation of the tool, the rate of ejection of fluid from the core pipe under the tool end

Q is significant, resulting in a lift force applied to the rock-breaking tool and pointing upwards, which prevents the latter from seizing. At the same time, the pressure of the fluid increases under the end of the ip5 of the struc- ture. Everything determines the lifting of the tool, the reduction of the adhesion force at the place of the anomalous contact of the rock-cutting tool with the rock and its further smooth operation.

Q After removing excess torque from the tool body 1 with internal protrusions 4, under the influence of fluid pressure in cavity 5, returns to its original position relative to shaft 2. In order to avoid the formation of disconnection5 from the rear sides of the blades 3 of the shaft 2, in the inner lugs 4 of the housing 1 of the damper there are openings connecting the hydraulic demper with the annulus space.

The prevention of leakage of flushing fluid and the sealing of movable joints is ensured by gland seals 19.

Claims (1)

Invention Formula A torsional vibration damper of a boring tool, including a hollow body with internal protrusions and openings, communicates the first cavity of the body with the annular space, is located concentrically to it the shaft with blades forming Q with the internal protrusions in the body pressure cavities, characterized in that, in order to increase the efficiency of the operation by preventing jamming of the drilling tool, the shaft and the blades are made with upper and lower windows connecting 5 the pressure cavities with the shaft cavity the last one has a partition disposed .mezhdu upper and lower windows at the lower end of the shaft cavity under injection control valve is mounted, and the upper window of the blades are provided with inverse plastinchaty.mi valves. 0., 0 cf3ue.3