SU757695A1 - Apparatus for determining azimuth and zenith angles of well - Google Patents

Description

The invention relates to the field of exploratory drilling and is intended to measure the curvature of exploration wells.

Known inclinometers single action, including a plumb with an eccentric weight, sensors for measuring the curvature of the well and locking device.

Such inclinometers, as a rule, are complex in terms of design, since they use either a clock mechanism or a time relay with an autonomous power source [1] to drive the arresting device.

A single-action inclinometer is also known, which includes an azimuth angle sensor, made in the form of a graduated hemisphere, 20 which, together with a zenith angle sensor, is rigidly connected to the arresting device {Ύ]. Fixing the positions of the sensors is carried out by shorting the contacts on the dial of the time – 5 relay. In this case, the core of the electromagnet moves the sensors of the zenith and azimuth angles until they are pressed against the spherical surface of the housing.

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This device has a complex structure, requires manual unloading after lifting it from the well, but the main thing is that the inclinometer cannot be included in the drill during the drilling process, since the arresting time must correspond to the time of the end of the voyage. However, to predict the time of the end of the flight is almost impossible. Therefore, in order to get a measurement of the curvature of the well, it is necessary either to interrupt the flight, or to wait until the relay operates after it has finished.

The aim of the invention is to reduce the measurement time in the drilling process and simplify the design.

This goal is achieved by the fact that the device is equipped with a frame and an emphasis installed in the casing, and the casing is made in the form of an elastic shell filled with heavy liquid and installed in a frame under the anvil, the stop being rigidly connected to the casing, and the frame with the drill string and spring-loaded relative to stop.

FIG. 1 schematically shows a general view of an inclinometer included in a drilling tool on

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Fig. · 2 - general view of the sensors, on

FIG. 3 shows section A-A in FIG. 1 (core pipe).

The column pipe 1 is connected to the drillstring 2 by detachable coupling halves 3. In the upper part of the core pipe 1, an emphasis 4 is installed with slots 5 through which the frame 6 passes, rigidly connected to the drillstring 2.

In the upper part of the frame 6, a spring 7 is installed, abutting with its ends on the frame cover and the stop 4. In the bottom cover · frame 6, an elastic transparent spherical shell 8 is fixed on which a vertical scale is applied and which is filled with a heavy fluid, where the sensitive element of the azimuth angle floats performed with a graduated sphere 9.

At the bottom of the sphere 9 is a plumb line 10, which is the sensor of the zenith angle.

The inclinometer works as follows. In the process of drilling during the transmission of the axial load, the half-couplings 3 are engaged. In this case, frame 6, overcoming the resistance of the spring 7, occupies the lowest position in which the elastic spherical shell 8 is undeformed and the sensitive sensors 9, 10 of the zenith and azimuthal angles located in it are in the unlocked state. After the end of the voyage, when the drilling tool is raised and the borehole is drilled, the drill string 2 moves upward, dragging frame 6 behind itself. fixed in the position in which they were downhole. Spring 7 eliminates the possibility of the sensors being released during random shocks during lifting. After

extraction of the drilling tool from the well turns the core pipe 1 and from the inclinometer, without disassembling it on the horizontal and vertical scales, the corresponding readings are taken.

The use of the invention in the practice of geological exploration will significantly reduce the time spent on inclinometric measurement by the geophysical service. In addition, the curved well curvature measurements will allow you to more quickly change its direction with the help of diverters in a timely manner to use other methods to combat the natural curvature of the wells. The scheme is also greatly simplified and the cost of the inclinometer is reduced in price.

Claims (1)

Claim A device for determining the azimuthal and zenith angles of a well, comprising a housing in which the sensitive elements of azimuthal and zenithing sensors are located, characterized in that, in order to shorten the measurement time during drilling and simplify the design, it is provided with a frame and an emphasis installed in the casing, and the body is made in the form of an elastic shell filled with heavy liquid, and is installed in a frame under the anvil, the anvil rigidly connected with the casing, and the frame with the drill string and is spring-loaded relative to the anvil. •