SU1463903A1 - Shock-damper - Google Patents

Abstract

This invention relates to the field of drilling. The purpose of the invention is to improve the efficiency of damping with a super-longtime shock absorber of oscillations of a wide frequency range. For this, the shock absorber has a piston 10 mounted on the upper end of the shaft (B) 7 and. interacting with elastic element. Volume 6, KOHycHjTO bushing 4, located in the upper chamber 12 and forming with the piston 10 an annular channel 11 of variable cross section, a flexible sleeve 14, forming with B 7 a flow channel 15. One end of the sleeve 14 is rigidly connected with B 7 and the other with case. 3. The floating piston 16, located in the lower chamber 13, is spring-loaded relative to the housing 3. When the shaft 7 moves up to the value DH, the damper stiffness increases due to a decrease in channel 11. With further movement of B 7, the damper stiffness is determined only by the stiffness of the elastic element 6 With such a con-. Structures of the shock absorber, given the parameters of the sleeve 4, the piston 10, the flexible sleeve 14, the annular channel 11 and the flow channel 15, can be damped out the oscillations of a certain specified value, 4 Il. (L In "Od with so with so QlUt.l

Description

The invention relates to the field of well drilling, in particular to a drilling tool.

The shock absorber can be installed in any part of the drill string, but it is most expedient to install it under fitting drill pipes. In this case, it stabilizes the load on the bit.

The purpose of the invention is to improve the efficiency of damping oscillations of the frequency range.

1 shows a shock absorber, a general view; figure 2 - aa in figure 1; in fig. 3 shows a section BB in FIG. in fig. 4 is a section bb In figure 1.

The shock absorber contains the subs 1 and 2, through which is included in the composition of the drill string, splined housing 3, sleeve 4 with a tapered lower part, spacer sleeves 5, elastic element 6, movable hollow splined shaft 7 with pefepuschnuy hole 8, with centering elements 9 and the piston 10, located at the upper end of the shaft 7, which, with the sleeve 4, forms an annular channel 11 of variable cross section, & upper and lower chambers 12 and 13, respectively, with a slotted body 3, communicating with each other. Figure 3: a flow channel 15 formed by an elastic sealing sleeve 14 and a movable hollow shaft | 7; One end of the sleeve 14 is rigidly connected to the shaft 7, and the other with housing 3. In the spring: epithelial chamber 12 there is an elastic element 6 that can interact with the piston 10, and in the lower chamber 13 there is a spring-loaded floating piston 16. The upper and lower chambers are filled with a grease pin.

The shock absorber works as follows.

The oscillations coming from the well are transmitted through the sub 2, to the shaft 7. When the shaft moves. 7 up to the value of / Jh, the piston 10 compresses the elastic element 6. At the same time, the liquid lubricant is displaced from the upper chamber through the annular channel 11 of variable cross section into the flow channel 15 and then through the bypass hole 8 into the lower chamber 13. With SITOM, the floating piston 17 moves down by an amount of 41, commensurate with the volume of fluid displaced from the upper chamber I2.

With an increase in the axial displacements of the shaft 7, the area of the annular channel 11 between the piston TH and the tapered bushing 4 decreases, while the rigidity of the shock absorber increases.

When moving the shaft 7 and the piston 10 to h {and h, the volume of the upper chamber 12 is insulated from the annular channel 11, and the damping rigidity in this

The case is determined only by the stiffness of the elastic element 6 and can be specified.

0

five

0

five

0

five

0

five

When the shaft 7 is moved downwards, the annular channel 11 opens, and the liquid through the bypass hole 8 and the flow channel 15 passes into the upper chamber 12, while the floating piston 16 moves upwards by an appropriate amount. Then the cycle repeats -.

With TaKo i of the construction of the shock absorber, given the parameters of the tapered bushing 4, the piston 10, the flexible sleeve 14, the annular channel P, and the flow channel 15, it is possible to damp the oscillations of a certain specified value.

Claims (1)

Invention Formula A shock absorber, comprising a housing, connected by a splined joint to the shaft and forming the upper and lower annular chambers with it, filled with liquid lubricant and hydraulically connected to each other, a resilient element located in the upper chamber and a floating piston in the lower chamber, distinguished by that, in order to increase the efficiency of damping of a wide range of frequencies, it is equipped with a piston located on the upper end of the shaft and installed with the possibility of interaction with an elastic element, a tapered bushing, ennoy in the upper chamber and the annular piston forming with variable cross-section channel, and a flexible sleeve, one end of which is rigidly connected to the "shaft, while the other - with the housing, wherein the floating porschen biased relative to the housing.