SU90725A1 - Instrument for determining orientation of guiding devices - Google Patents

Description

Instruments are known for determining the orientation of guide devices when drilling inclined wells, based on measuring the angle between the azimuth of the curvature of the well and the bending plane of the guide device by obtaining a print of the knives of the guide device on the print device. However, the use of such devices for the installation of inclined wells requires the installation of tubes with hydrofluoric acid in the devices, which complicates the downhole orientation process.

A distinctive feature of the proposed device is the use of an eccentric device suspension below its center of gravity. Such a constructive design of the device simplifies and accelerates the process of downhole orientation.

FIG. 1 shows the proposed device in general; in fig. 2 - the same in section.

With a borehole curvature of 3 ° or more, the eccentrically suspended device exits the vertical position and lies in the plane of curvature, with the azimuth position of the borehole located at the intersection of the plane perpendicular to the device with the axis of the cord. It is fixed to the housing 1 of the instrument with a mark 2. In the lower part of the instrument housing there is an internal cutting into which the cup 5 is screwed, having a lead seal 4 in the lower part. The cup has a recess 5 for screwing away from the instrument housing and an opening 6 for installing a test tube, if necessary simultaneously measure the borehole curvature in two ways. A gash 7 for a loop of a cord passed through an opening 5 in the upper part of the body is welded to the body. The opening 9 on the body serves to set the mandrel with which the cup is turned off. Hole W is designed to hang the instrument in its designated location in the rig.

For the usual cases of bottomhole orientation, the device is lowered into the well on a wire at a speed of 1-0.5 m per second. After hitting

„NO 90725-- 2 -

For knives, the instrument is removed from the tubes without knife exposure. The cup is unscrewed from the body and installed on the bottom hole sighting card so that the body mark transferred to the cup coincides with the wellbore at the depth of the location of the wells. Then, the axis of the marker on the seal in the direction of the bevel of the scallops of the knives will show on the downhole sighting card the azimuth of the position of the diverter, (the curve of the pipe).

During the first descent of the device it is necessary to check the coincidence of the mark on the device body with the azimuth of the wellbore. For this, a glass tube is placed in the cup and a seal is created between the tube (cotton, paper) to maintain the position of the tube. Then they pour a float knollot into it and close it with a rubber stopper. The device is lowered into the well and kept on the blades for 7-12 minutes. After the instrument is removed from the well, the label is transferred from the well to the cup, screwed off, the acid is poured out, washed and the readings are decoded.

If the lower point of the acid-formed meniscus on the test tube, which was carried to the cup, coincides with the tag removed from the body, no corrections are required. If there is a slight assignment, the label corresponding to the demolished lower point of the needle is applied to the cup, screw the cup into the body until the first marks match and the new mark will continue to be removed as the azimuth indicator of the wellbore.

Subject invention

A device for determining the orientation of the bottom devices when drilling inclined wells, based on measuring the angle with the azimuth of the curvature of the borehole and the bending plane of the directional device by obtaining a print of the blades on the device’s printing device, characterized in that in order to orient the device body along the azimuth of the curvature of the well and ensuring a centered fit of the print on the knives of the guide device, an eccentric suspension of the device below its center of gravity is applied.