SU1647364A1 - Device for determining lubricating capacity of drilling mud - Google Patents

Abstract

The invention relates to a testing technique and can be used to determine the lubricating properties of liquids. in particular drilling fluids. The purpose of the invention is to improve the measurement accuracy by increasing the amount of fluid circulating between rubbing surfaces. A device for determining the lubricity of a drilling fluid comprises a housing 1. in which a friction unit is disposed, consisting of three disks 6, 7 and 8. The middle disk 8 is made with grooves on the side surfaces, thereby achieving supply and circulation of drilling mud through friction knot. The middle disk 8 is connected to the friction torque meter, the load on the disks 6, 7 and 8 is set by means of a loading device through point 14, and between them a load indicator 12 is installed.2 or so on. Ё О 4 V СА) Ј

Description

The invention relates to a testing technique and can be used to determine the lubricating properties of a fluid, in particular drilling fluids.

The purpose of the invention is to improve the measurement accuracy by increasing the amount of fluid circulating between rubbing surfaces.

Figure 1 shows the device, a general view; figure 2 - section aa in Fig, 1.

The device includes a housing 1 to which a bracket 2 is mounted with a shaft 3 rotating actuator 3 mounted on it. The friction unit is placed in the chamber 5 with the test solution and made as placed on the shaft 4 with the possibility of axial movement and torque transmission (in the drawing The connection is conventionally shown as a key), two extreme disks 6 and 7 and an intermediate disk 8 located between them with the possibility of axial and rotational movement relative to the shaft 4. On the working surfaces of the middle disk there are grooves 9 (in the drawing they are but shown radially) to improve circulation of the test solution through the friction knot.

A thrust assembly for creating an axial load in a friction pair contains a screw pair consisting of a cap nut 10 articulated with a screw thread of the shank of the flange 11. A measuring device 12 for measuring the axial loading force of the friction knot is placed between the cap nut and the spring loaded pin. The measuring device 12 is used as a pusher transmitting an axial force through the ball 13 on the pin 14 through the pressure spring 15, which transmits the force to the friction unit. The friction torque meter 16 is attached to the middle disk 8 by means of a ball joint 17, and to the body 1 by means of another connection. The shaft 4 is equipped with a stop collar 18 and is placed in a bearing 19 fixed to the body 1. The middle disk 8 is equipped with a bearing 20 (bearing 20 is conventionally shown as a ball bearing, the inner race of which is mounted on a shaft on a sliding fit 4). Case 1 is equipped with a drain plug 21. The standard LH-143 power converter is used as a friction torque meter 16, and an analog TPA type analog pressure transducer is used as a sensitive element (measuring device 12).

The device works as follows.

Chamber 5 is filled with drilling mud or, if constant monitoring is necessary, the drilling fluid is passed through it (in order not to darken the drawing, the chamber is conventionally shown open, since its design can be very diverse in

depending on the task.

After installing a given angular velocity of the extreme disks 6 and 7, placed on the shaft 4, the drive 3 and a given axial load of the disks 6 and 7 on the middle disk in

0 by screwing the cap nut 10, which communicates the force through the measuring device 12, the ball 13, p 14, and the spring 15 onto the disk 6, which, moving on the shaft 4, presses the middle disk 8 against the disk 7, further movement of the disks 6 and 7 and the middle disk 8 clamped between them along the shaft 4 does not occur, as the disk 7 rests against the flange 18 of the shaft 4, and that, in turn, - into the bearing 19.

0 This technical solution allows to achieve self-installation of the middle disk 8 and the extreme disks 6 and 7 relative to each other, without introducing additional kinematic and dynamic errors at

5 measurement of friction using the meter 16 moment of friction. The effect can be achieved due to the fact that the moment of friction is measured directly on the middle disk 8 through ball joints 17 (allowing to eliminate the occurrence of radial loads on the measuring device 12), the middle disk 8, located on the shaft 4, is carried away by the extreme disks 6 7 and tends to rotate relative to housing 1, but

5 is kept stationary by the device.

Claims (1)

Apparatus of the Invention A device for determining the lubricity of a drilling fluid, comprising a housing, a rotationally driven shaft, a loading unit, a friction unit connected to the shaft, for accommodating the drilling mud, and a friction torque meter, characterized in that 5 in order to increase accuracy, the friction unit is made in the form of three axially mounted axial disks mounted on the shaft, the middle of which is also installed 0 rotation relative to the shaft and associated with the friction torque meter, and on the side surfaces of the middle disk there are grooves for mixing and supplying to the surfaces 5 friction of the drilling fluid disks and for its mixing, the loading unit is located on the side of the shaft opposite to the drive and is connected with one of the extreme disks, and the device is equipped with a disk movement limiter. FIG. 2