RU1808958C - Drilling stand unit - Google Patents

Abstract

Usage: drilling rigs for studying the technical characteristics of hydraulic motors and rock cutting tools during drilling. Essence: there is a strain gauge pressure sensor 5 (10), which is located at the level of the elastic element 6. The cavities of the pressure sensor 5 (10) and element 6 are in communication. A pressure sensor 5 may be installed outside the housing 3 and parallel to the elastic element. 6. The pressure sensor 10 can be made with a blind internal cavity and installed in the housing 3. When measuring the parameters, the influence of the washing fluid pressure on the axial load is excluded. 2 s.p. f-ly, 3 ill.

Description

The invention relates to drilling equipment, namely to drilling stands, on which the technical characteristics of hydraulic motors and rock-cutting drilling tools during drilling are studied.

The aim of the invention is to increase the accuracy and quality of measurement of the power parameters of the drilling process by eliminating the influence of the washing fluid pressure on the axial load.

In FIG. 1 shows the site of the drill stand; Fig. 2 is a schematic diagram of the inclusion of a compensator in the hydraulic system of a drill stand at the level of the measuring elastic element; in Fig.3 is an example of the installation of the compensator in the housing protecting the elastic element.

Figure 1 shows the load device 1, the rotator 2, the measuring elastic element in the housing 3, the bit 4; in the diagram of Fig. 2 - a compensator 5 - a pressure sensor and a measuring elastic element 6; Fig. 3 shows an elastic element 6 with axial force strain gauges QKHMH 7 in a protective housing 8, where there is a pressure sensor 10 connected to the channel 9 with the internal cavity of the elastic element and the sensors 11 located on it. Internal diameter of the elastic element D2, external - DI . pressure sensor inner diameter d2, external-di.

The difference between the two circuits in FIG. 2 and FIG. 3 is that the pressure sensor in FIG. 2 works by compressing the longitudinal fibers of the working cylindrical part under the expanding action of internal pressure, and in FIG. 3 due to the combined action of compression and, on the other hand, stretching from the same pressure on the bottom of the sensor. Both effects are described in detail below.

Node Drill Stand works as follows.

WITH/)

WITH

00

about

00

ate

00

When the load on the bit and fluid is applied to the hydraulic flushing system, the elastic element is deformed, and axial deformation occurs both due to the action of the axial load equal to the specified load on the bit, and due to the action of internal pressure, as well as due to tensile forces, arising in the presence of a differential pressure on the bit, while the corresponding deformations are equal

0

To determine the axial load signal by compensating for the pressure-undistorted signal, the internal cavity of the elastic element is connected to a strain gauge pressure sensor, the electrical signal of which is used to compensate for the effect of pressure on the axial load.

The deformation of the wall of the pressure sensor is proportional to the pressure acting inside it, as well as for the elastic element

Yeszh 4 Ros

E (Y-02)

2vP -gD2

tf-d2

brast:

4N

E (th --- o2)

where ECL is the compression strain from the action of axial force equal to the load on the bit Јос,

Er compression deformation along the axis of the elastic element from the expanding action of internal pressure p,

The tensile strain resulting from the tensile action of the internal pressure on the column with full or partial closure of the bit wash channels, i.e. when races occur; T back pressure N: N P S, where S is the amount of overlap of the cross section.

The maximum tensile back pressure occurs when the inner section of the drill string is completely closed

1 N 4 p L DZ,

I

Of the three components of the axial signal corresponding to the total axial deformation

bos Јсж + Cz + Ерзст

only the first one is useful, corresponding to the real load on the bit, and the sum of the other two distorts the useful signal:

Bvred b + erast O 2v)

AND

ttf-D2E 55

That is, e is proportional to

R.

 d

Ez - -75-

fifteen

df - oi

With a blind end of the sensor, such as .3,

- to this is added strain deformation -

pressure is also proportional to pressure

twenty

pd

ok

Lrost - - .9 ---

jrE () and the total strain is

ek (1 -2v)

d

Attitude

H R / pk .t2 / p2

L- Ј harm / Ј - ---- / ---- 2 1 - t 1 - g

5

5

0

5

where t D2 / Di, n d2 / di, depends only on the sizes of the sensors, and not on p, therefore, it remains constant under fluctuations in the effective internal pressure, which allows the use of an electric signal Qk corresponding to deformation

A compensation signal for AUvred signal corresponding to Harmful axial load signal distortion. The value of L can be called the compensation coefficient. The pressure sensor is not affected by internal pressure

Electrical compensation of the distorting effect of pressure on the axial load occurs as follows:

signals from strain gages of torque, load, and pressure are supplied to direct current amplifiers (DC amplifiers). Since the internal pressure does not affect the operation of the torque bridge, the output signal from the torque converter is removed without distortion.

The signal from the load bridge of the load contains a pressure component. To compensate, it is supplied to an electronic device that sums it with a certain sign with the signal from the pressure sensor in the proportion set by primary calibration at a single pressure value. The difference signal is an electrical analog of the axial load without distortion.

Claims (3)

SUMMARY OF THE INVENTION 1. A drilling rig assembly comprising a hydraulic system, a loading unit, a rotator associated with a loading unit, a bit located in the lower part of the assembly, and a housing with an elastic measuring element and a strain gauge for measuring axial force between the rotator and the Chisel, characterized in that, in order to improve the accuracy and quality of measuring the power parameters of the drilling process by eliminating the influence of the pressure of the washing fluid on axial load, it is equipped with a strain gauge pressure sensor for flushing fluid, which is located in the hydraulic system at the level of elastic item; the cavity of which is in communication with the cavity of the strain gauge pressure sensor of the washing liquid. 2. The assembly according to claim 1, wherein the strain gauge pressure sensor is mounted parallel to the elastic element outside its housing, and the input and output of the strain gauge pressure sensor are connected respectively to the input and output of the ynpyrofo element. 3. The assembly according to claim 1, characterized in that the strain gauge pressure sensor is filled with a blind internal cavity and is housed in the housing of the elastic Element. ..with