SU1544964A1 - Device for determining azimuth of borehole crooking - Google Patents

Abstract

The invention relates to a drilling technique and allows improving the accuracy of determining the azimuth of a well (C) in ferromagnetic media. The device comprises a housing 1 made in the form of two parts 4 and 5 connected between each other by a detachable connection, between which removable inserts 6 are placed. In the upper 4 and lower 5 parts there are installed the first sensor (D) 2 and the second D 3 of the horizontal component vector magnetic field strength. D 2 and 3 are made in the form of external frames (P) 7.8 and internal frames 9.10, the axes of rotation of which are mutually perpendicular. Eccentric weights 14, 13, 11, and 12 are fixed on P 7-10. On the axes of rotation P 7 and 8, D 19 and 20 angles of rotation are installed. In curved C, under the action of loads 11 and 12, P 9 and 10 are installed in the same plane. From the difference in readings D 2 and 3, taking into account readings D 19 and 20, the value of the angle of rotation of the anomalous magnetic field in the horizontal plane is determined. The second D 3 determines the value of the azimuthal curvature C relative to the vector of the anomalous magnetic field. The obtained values are summed with the value of the known azimuth at the mouth of the C and the azimuth of the curvature of the trajectory C is determined by the amount of the sum. 1 Cp. Of the line, 2 ill.

Description

(21) 4417204 / 23-03

(22) 04/27/88

(46) 02.23.90. Bul № 7

(71) Ufa Aviation Institute. Sergo Ordzhonikidze

(72) M.A. Urakseev, O. Shtanko, G.V. Milovzorov and R.A. Sultanaev (53) 622.242 (088.8)

(56) USSR author's certificate N 10025 7, cl. B 21 C 47/02, 1981.

USSR Author's Certificate No. 1467162, cl. E 21 B 47/02, 1988.

(54) DEVICE FOR DETERMINING THE AZIMUTE OF CURVING THE WELL TRAJECTORY

(57) The invention relates to a drilling technique and makes it possible to increase the accuracy of determining the azimuth of a well (C) in ferromagnetic media. The device comprises a housing 1, made in the form of two parts 4 and 5 connected between each other by a detachable connection, between which removable inserts 6 are placed. In the upper 4 and lower 5 parts there are installed the first sensor (D) 2 and the second

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D 3 directions of the horizontal component of the magnetic field strength vector. D 2 and 3 are made in the form of external frames (P) 7.8 and internal frames P 9, 10, the axes of rotation of which are mutually perpendicular. Eccentric weights I, 13, 11, and 12 are fixed on P 7-U. On the axes of rotation P 7 and 8, D 19 and 20 angles of rotation are set. In curved C, under the action of loads 11 and 12, P 9 and 10 are installed in the same plane. By difference, pho tovoretion refers to the technique of drilling wells and is designed to determine the azimuth of the curvature of the borehole trajectory in ferromagnetic

: redah.

The purpose of the invention is to improve measurement accuracy.

FIG. 1 shows a device for determining the azimuth of a curvature of a well; in fig. 2 is a vector diagram illustrating the principle of operation of the device.

The device comprises a housing 1, in which the first 2 and second 3 sensors of the direction of the horizontal component of the magnetic field strength vector are placed one above the other. The housing 1 is made of a composite in the form of two parts k and 5 of a cylindrical shape, placed one above the other and connected by a detachable connection. The first 2 is located in the upper part C of the housing 1, and the second sensor 3 is located in its lower part 5. Removable cylindrical inserts 6 are placed between the upper 4 and lower 5 parts of housing 1. Sensors 2 and 3 are made in the form of external frames installed in housing 1 7 and 8, the axes of rotation of which are aligned with the longitudinal axis of the housing 1. In the outer frames 7 and 8 there are fixed inner frames 9 and 10, the axes of rotation of which are perpendicular to the axes of rotation of the outer frames 7 and 8. On the inner frames 9 and 10 and The outer frame 8 of the second sensor 3 is fixed main eccentric weights 11-13. Additional eccentric weight 1 is fixed on the outer frame 7 of the first sensor 2.

On the inner frames 9 and 10 there are two pairs of flux-probes 15,16

The indications D 2 and 3, taking into account the readings D 19 and 20, determine the value of the angle of rotation of the anomalous magnetic field in the horizontal plane. The second D 3 determines the value of the azimuthal curvature C relative to the vector of the anomalous magnetic field. The obtained values are summed with the value of the known azimuth at the mouth of the C and the azimuth of the curvature of the trajectory C is determined by the amount of the sum. 1 Cp. Of the line, 2 ill.

and 17.18, the sensitivity axes of which in each pair are orthogonal and located in the plane of the inner frames 9 and 10. Along the axis of rotation of the latter, the axis of sensitivity of one of the flux probes 15 and 17 of each pair is placed. The sensitivity axes of the flux probes 16 and 18 are the sensitivity axes, respectively, of the sensors 2 and 3 of the direction of the horizontal component of the magnetic field strength vector. On the axis of rotation of the outer frames 7 and 8, angle sensors 19 and 20 are installed.

The device works as follows.

The sensors 2 and 3 have the horizontal component of the magnetic field strength vector, located respectively in the upper C and the lower 5 parts of the body at a distance equal to the measurement step, the value of which is chosen from 5 to 20 m and set by the number and length of the cylindrical inserts 6 Before starting measurements, the angle between the axes X01 and X02 (when combined with the sensitivity axes of sensors 2 and 3 of the direction of the horizontal component of the magnetic field strength vector signals from the sensors | 19 and 20 of the external rotation angle) is determined their frameworks 7 and 8 are zero. For this purpose a device in the horizontal plane, the frame 7 and 8 under the action of eccentric loads 1 and 13 are mounted in the same plane, and the angle h 0raven

about MVi-V ,,.,,

where tf, and signals, respectively, from sensors 19 and 20 of the angle of rotation of the outer frames 7 and 8.

ha of the vertical sections of the well and at small tilt angles, the outer frames 7 and 8 are arbitrarily set. Using the sensors 19 and 20 of the angle of rotation of the outer frames 7 and 8 at each measurement interval, the angle d / (cf.- (vu +) between the X, - axes (1 and X; (1 sensitivity of sensors 2 and 3 of the horizontal component) Magnetic field strength vector. In areas wound to the measurement interval, the angle d is determined and recorded between the sensitivity axis of sensor 2 and the horizontal component H 1-.1 of the magnetic field strength vector, and also measured and fixed. angle at; between the axis of sensitivity of the sensor 3 and the horizontal direction the htal component of the vector hL of the magnetic field strength. The angle ud of the rotation of the vector of the anomalous magnetic field in the horizontal plane is defined as

rJ, it-ai / i-of ,,,.

When a benthole of frame j and 10 appears under the action of eccentric weights 11 and 12, they are set in the same plane, and the value of the angle q ifi becomes zero and does not affect further measurements. The ha curved sections of the well using the bottom sensor 3 of the direction of the horizontal component of the magnetic field strength vector measure the magnetic azimuth d of the curvature of the well trajectory relative to the vector of the anomalous magnetic field, after which the azimuth of the curvature of the well trajectory relative to an arbitrarily chosen direction is determined from the equation:

and

n - 10 + n, i + arf,

where o is (the angle between an arbitrarily chosen direction and the horizontal component of the magnetic field strength vector at the wellhead; n is the number of intervals (measurements). The proposed device provides the ability to measure the angle between the outer frames, which allows to take it into account when determining the angle

The rotation of the Vectra intensity of the abnormal magnetic field causes the increase in the measurement accuracy. The construction of the body as composite parts allows these parts to be used as independent devices for measuring azimuth in wells where magnetic field anomalies are absent or insignificant, which expands the operational capabilities of the device.

Claims (2)

1. A device for determining the azimuth of the curvature of the well trajectory, comprising a housing in which the first and second sensors of the direction of the horizontal component of the magnetic field strength vector are placed one above the other, made in the form of external frames installed in the housing, the axes of rotation aligned with the longitudinal axis of the housing, internal frames fixed in the outer frames, the axes of rotation of which are perpendicular to the axes of the external frames, the main eccentric weights fixed on the inner frames and the outer frames The second sensor is located on the inside of two pairs of flux-probes whose sensitivity axes in each pair are orthogonal and located in the plane of the inner frames, along which the axis of rotation of the sensitivity axes of one of the flux-probes of each pair, characterized in that, in order to improve measurement accuracy, it is equipped with an additional eccentric weight, fixed on the outer frame of the first sensor, and two angle sensors mounted on the axes of rotation of the outer frame, and the housing is made up of in the form of two pieces of cylindrical shape, arranged one above another and bonded to each other releasable connection, wherein the first sensor is disposed in the upper portion of the housing, and the second detector - in its lower part. 2. The device according to claim 1, about tl and h aa yu e with the fact that between the top and lower parts of the body are placed 5 removable cylindrical inserts. five 0 five 0 Editor N. Yatsola Compiled by A. Tsvetkov Tehred 1M.Didyk, Order 79 Circulation 485 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab., H / 5 at. - -... ". - - - - - - - - - t - - .- - -. - - - “- - --- - -“ --- - - - - - - Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 -№ FIG, g Proofreader M.Sharoshi Subscription