SU889836A1 - Apparatus for determining three-dimensional position of borehole - Google Patents

Description

(54) DEVICE FOR DETERMINING THE SPATIAL POSITION OF THE WELL

I

The invention relates to devices for measuring the angle of inclination of a well and orienting measuring instruments (deformometers, pressure meters and others) in it.

The inclinometer is known, which contains a symbol, a fixing device, a compass with a reachord, and an actuator. The compass is equipped with an additional mechanism made in the form of an interacting wedge with a brace, a needle freely installed in a channel displaced relative to the axis of rotation of the compass and perpendicular to the axis of the magnetic needle, a rectangular lever, the free end of which enters the hole in the axis of the magnetic needle 1.

The disadvantages of this device are the impossibility of using it in wells of small diameter and the need to remove the device from the well to determine the measured angle of its deviation after the next measurement.

It is also known a device for determining the angle of inclination, consisting of upper and lower cylindrical bodies connected by strings, excluding the mutual rotation of the body relative to the longitudinal axis. Inside shtang is a wire that goes from the lower cylinder to the cable head located on the upper cylinder. The measuring parts located in the upper and lower cylinders are completely identical. Two tubular V-shaped levels are fixed inside each body in mutually perpendicular planes. The inductors are worn on the straight sections of the tubes. A conductive liquid, such as mercury, is poured into the tube, the upper part of them is filled with a light damping fluid. In the upper part of the tubes there is a screw for adjusting the degree of damping. Below levels are the generators and power supplies 2.

The disadvantages of this device are the complexity of the design of the device, the need for sophisticated recording equipment in the production of measurements, the non-use of the device in small-diameter wells and a relatively small range of measured angles.

(O-60 °). All this, as well as the presence in the measuring unit of the device of electrical prices having reactance, makes it difficult to use this device in mine conditions, its operation, reduces the accuracy, reliability and performance of measurements.

The aim of the invention is to expand the measurement range.

This goal is achieved by the fact that the measuring elements are made in the form of a round ring bent into a non-conductive tube, inside which are placed wires with different resistances and a mercury contact.

For measurements in wells of different diameters and elimination of the influence of irregularities and cavities in them, the device is equipped with centering supports made in the form of flat plates.

FIG. 1 shows the device, general view, section; in fig. 2 shows section A-A in FIG. one.

The proposed device consists of body 1, covers 2 and 3, which are threadedly connected with gaskets and gaskets 4 and connected to body 1. The lid 3 serves simultaneously to orient and send measuring instruments in the well. On the covers 2 and 3, spring guide supports 5 are fixed. In the cavity of housing 1, two annular resistance sensors are located to determine the vertical angle of inclination of the borehole 6 and to orient the devices 7. The resistance sensors 6 and 7 are installed in two mutually perpendicular planes; a round non-conductive (for example glass) tube 8 bent in a ring. Inside tube 8 there is a wire 9 with low electrical resistance and a wire 10 with great resistance, as well as a drop of mercury 11, which plays the role conductive contacts (engine) and fills the cross section of the tube 8 so that there is no damping of its air. Wires 9 and 10 are made of non-amalgamation metals. Ring resistance sensors 6 and 7 are fixed in housing 1 in mutually perpendicular planes by means of a fastening assembly, which includes clamps 12-14, shock-absorbing gaskets 15 and locking screws 16. On terminal block 17, wires 18 are dispersed on one side of wire 18 from resistance sensors 6 and 7, on the other hand, the wires 19 of the flexible cable 20, which is fixed in the cap 2 by means of a nut 21 and a gasket 22.

The proposed device works as follows.

A device for measuring the vertical angle of inclination and orienting the instruments in it is placed into a well drilled in the mountain range with the help of a jib tool connected to the lid 2. After the device is fed into the well for the required distance, the angle of deviation of the well from the horizontal is determined using sensor 6 as follows. A drop of mercury 11, moving through the tube 8, is in continuous contact with the wires 9 and 10, which causes a change in the resistance of the circuit. The signal about the change in resistance passes through the wires of the electric circuit (9, 10, 18, 19) and goes to the recording equipment, for example, the IZD-2 stress control station. Based on recorded readings of the recording equipment and the calibration data of the proposed device, the vertical angle of deviation of the well is determined.

When the measuring device is oriented in the borehole (for example, such as a deformometer, presiometer and others), the proposed device is connected to it with the help of cover 3, and in this case a rheostat sensor 7 is in operation. Measurement

5 of the angle of rotation of the instrument is similar to measurements when determining the vertical angle of the well. To measure the curvature trajectory of a well using the proposed device as it moves along the length of the well with a certain pin, a vertical angle is determined.

The proposed device allows reducing time expenditures and simplifying the process of measuring in industrial conditions, using the simplest recording equipment.

Claims (2)

1. USSR Author's Certificate No. 442289, cl. B 21 B 47/02, 1974. 2. USSR author's certificate number 597822, cl. B 21 B 47/022, 1976.