SU827766A1 - Device for monitoring cementing of wells - Google Patents

Description

Source 2 consists of a fluid-filled housing 8, which houses an annular magnetostrictive transducer 9 fed from generator 6. The radiating surface 10 of the transducer 9 forms a gap with the inner surface of the housing 8, the dimensions of which are chosen from the resonance condition of the oscillatory system.

Block 3 includes an electric motor 12 housed in housing 11, which, through a lowering gearbox 13, transmits forward movement to an output shaft 14, which is rigidly connected to the supporting disk 15. The supporting disk 15 is connected to spring-loaded pushers 16 that interact with the small arms 17 of the levers 18, fitted with at the ends of the rubber wheels 19 and pivotally connected to the housing I. With the levers 18, the receiving piezo sensors 21 are pivotally connected and provided with locks 20 with the possibility of orienting the sensitive surface 22 in parallel casing 23 depending on the diameter and, consequently, the angle ip of the deviations of the levers 18 from the vertical. The electronic unit 1, blocks 2 and 3 are interconnected by sealed adapters 24 and 25.

The device works as follows.

Before descending into the well 26, depending on the diameter of the casing 23, the piezo sensor 21 is oriented so that the sensitive surface 22 is parallel to the casing forming when opening the levers 18 at a predetermined angle, the value of which is determined by the diameter of the casing.

The device 26 is lowered into the borehole 26 through the inner hole of the drill pipe 28. The section of the casing 23 is connected to the drill pipe 28 by a hook-on node 29. The device’s descent depth is determined from the condition that the receiving piezo sensors 21 are 3-4 m below the calculated level 30 lifting cement mortar in the annulus. Then turn on the electric motor 12 and open the levers 18 up to the stop of their ends with the casing 23. Turn on the recording equipment of the logging station (not shown). After that, through the grouting posts 31

Cement mortar is pumped into the annulus, which replaces the drilling fluid, which creates a change in the density, and therefore the speed of passage of the elastic will and amplitude of the signals. If a

In the process of pumping the calculated volume of cement slurry, changes in the readings of the recording equipment are not clear, which may be due to absorption or insufficient consideration of the cavernousness of the borehole walls, it is necessary to lower the device to the bottom and record the acoustic parameters during lifting.

Form. M lla invented and

A device for controlling cementing wells, comprising a housing with centering elements, including an electronic unit, an emitter and a piezopath receiver of elastic vibrations, characterized in that, in order to improve accuracy when monitoring cementing wells with large-diameter casing, mounted on centering elements with the possibility of installing a sensitive surface of piezo riders parallel to the tube forming an obsadia.

Information sources,

taken into account in the examination

1. USSR author's certificate No. 312936, cl. E 21B 47/00, 1969.

2. USSR author's certificate number 194694, cl. Е21В 49/00, 1967 (prototype),

Claims (1)

Claim A device for monitoring cementing wells, comprising a housing with centering elements, including an electronic unit, emitter and a piezoelectric receiver of elastic vibrations, characterized in that, in order to improve the accuracy of cementing cementing wells with large diameter casing pipes, it is equipped with additional piezoelectric receivers fixed to the centering elements with the possibility of installing the sensitive surface of the piezoelectric receivers parallel to the forming casing.