SU1661388A1 - Device for determining three-dimensional position of borehole - Google Patents

Abstract

The invention relates to mining and is intended to determine the parameters of the curvature of a well. The goal is to improve measurement accuracy and simplify the design. On the casing (K) 1, the coil 2 is mounted for movement in two mutually perpendicular directions. In K 1 there is a plumb line marked along the length (C) 3. One end of the C 3 is wound on the coil 2, and the other is fixed on the downhole centralizer 4, made in the form of a long rod, in the upper part of which spring elements 5 are fixed. In K 1 there is also a measuring unit 10 with two mutually perpendicular scale bars (M) 6, connected to K 1 by flexible threads 9. On M 6, levels 7, 8 are fixed at right angles to each other, located in the same horizontal plane with displacement relative to the central axes of M 6. Moreover, through M 6 central hole in which the size schena C. 3. With spool 2 lowered centralizer 4 to a predetermined depth, and C 3 is set vertically to the markings on the levels 7 and 8. Measurement of dissolved barchart rulers unit 10 displacement C 3 with respect to the wellhead. The magnitude of the measurements determines the azimuth of the curved well and the magnitude of the displacement of its cross section at a predetermined depth. 5 il.

Description

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the parts of which are fixed spring elements 5. In K1 there is also a measuring unit 10 with two mutually perpendicular scale bars and a pattern (M) 6, connected with K 1 flexible threads 9. On M 6 they are fixed at a right angle to each other Levels 7, 8, located in the same horizontal plane with an offset relative to the central axes of M 6. Moreover, through 6 is performed in M 6

The invention relates to mining and is intended to determine the parameters of the curvature of a well.

The purpose of the invention is to improve the measurement accuracy and simplify the design.

Fig. 1 shows a device for determining the spatial position of a borehole, a general view; Fig. 2 shows the location of the coil, top view; on fig.Z - section aa in figure 1; figure 4 - section bb in figure 1; Fig. 5 is a diagram for determining the azimuth and magnitude of the displacement of the borehole axis from the vertical.

A device for determining the spatial position of a borehole contains a frame-type body 1, at the upper end of which a coil 2 is mounted so that it moves in two mutually perpendicular directions. 8 A body 3 marked along the length of a plumb-line 3 is placed on the body 1, and the other is fixed on the central axis of the downhole centralizer 4 with spring elements 5 mounted on it in the radial direction. In the case 1 there is also an indicator 6 with two levels 7 and 8 associated with the case m 1 flexible yarns 9 and a measuring unit 10. The downhole centraliser 4 is made in the form of elongated rod, and the spring members 5 are fixed in its upper part.

Two rolling pins 11 (FIG. 2) are fixed to the upper part of the housing 1, on which a slide is mounted in the form of two bushings 12, which are rigidly interconnected by two guides 13, with the possibility of translational movement. One of the bushings 12 has a locking screw 14,

On the guides 13 with the possibility of translational movement in the perpendicular direction relative to the movement of the sleeves 12, a carriage 15 is installed with a rigidly fixed coil 2 fixed to it, having an opening 16 for the string 3 and a locking screw 17.

the central hole in which C 3 is placed. Using a coil 2, lower the centralizer 4 to a predetermined depth and set C 3 vertically along the marks at levels 7 and 8. Measure with a scale bar of block 10 offset 3 from the wellhead. The magnitude of the measurements determines the azimuth of the curved well and the magnitude of the displacement of its cross section at a predetermined depth. 5 il.

a through central hole 18 (FIG. 3), in which the string 3 is placed, and a locking screw 19 is mounted for fastening the pendulum to the string. On tribute 6 at right angles

Levels 7 and 8 are fixed to each other with marks 20 (air bubbles located strictly in the middle of the level when the latter is located in the horizontal plane). Levels 7 and 8

fixed on the tambourine 6 in the same horizontal plane with an offset relative to its central axes.

Measuring unit 10 (FIG. 4) contains two mutually perpendicular scale bars: a fixed ruler 21 with a scale of 22 and a movable nonius 23 and a ruler 24 that is movable in the perpendicular direction with a scale of 25. On the nonius 23, marks 26 and 27 are made, and on line 24, groove 28 for string 3.

A device for determining the spatial position of a borehole works as follows.

The device is rigidly fixed on the conductor 29 of the well 30 (or on the casing), orienting it relative to the cardinal directions by the direction of the scale of the ruler 21 and 24. Release the stop

screw 19, thanks to which the tang 6 hangs loosely on the thread x 9, and the plumb string 3 is able to move freely in the hole of the 18th tandem. Using the coil 2, lower the centralizer 4 into the mouth

wells 30 and secure the coil against rotation. The rim 6 is raised upward so that a slack is formed in the flexible wires x 9 (Fig. 1). Then the tambour 6 is fixed to the plumb string 3 by a locking screw 19 and moving the carriage 15 with the coil 2 along the guides 13 and the sleeves 12 along the rolling pins 11 achieve zero readings at levels 7 and 8, which corresponds to the vertical position of the plumb string 3.

The groove 28 of the ruler 24 is placed on the string 3, while reading the indications of marks 27 and

26 on scales 22 and 25, taking them as reference values.

The position of the upper end of the string 3 plumb fix the locking screws 14 and 17, the locking screw 19 is released, releasing the string, and using the coil 2 is lowered the centralizer 4 to a predetermined depth. If section 31 (FIG. 5) of well 30 at a predetermined depth is offset relative to section 32 of the wellhead, then the lower end of the plumb line 3 at centralizer 4 is displaced by a certain amount, the string takes an inclined position in space and marks 20 at level 7 and 8 shifted from the center of the levels. The locking screw 19 secures the tambourine on the string 3, secures the locking screws 14 and 17 of the slide, and by moving the carriage 15 in two directions, it is necessary to return the marks of 20 levels and the central position, i.e. return the string 3 to a strictly upright position.

The new position of the string 3 is measured with scale bars 21 and 24 and the values of the marks 26 and 27 compared with the measurements at the wellhead are laid, respectively, as segment 33 and segment 34 (figure 5). The magnitude of hypotenuse 35 corresponds to the magnitude of the displacement of the well section at a given depth, and the azimuthal direction of the curved well is determined by the magnitude of the angle. To measure the curvature of the well at other intervals, the measurement cycle is repeated as described.

If the well has a curved section and after its correction, its vertical section is formed, which is to be measured by its displacement, then the centralizer 4 in the form of a long rod with spring elements 5, when lowered into the vertical section, takes a strictly vertical position under the action of its own weight and carries the spring elements 5 in the corrected vertical area.

Improving the accuracy of measurement and simplifying the design provided by the proposed device, determine its main advantages in comparison with the known. The arrangement of levels in one plane with an offset relative to the central axes of the tandem and the exclusion from the design of the coil hanging frame, which is rigidly fixed to the housing, also reduce the size of the device and provide ease of operation.

Claims (1)

The invention The device for determining the spatial position of a borehole, comprising a housing in which a master has been placed with levels fixed to it at a right angle to one another, a measuring unit with two mutually perpendicular scale bars and marked along the length of the plumb line, one end which is wound on a coil, and the other is mounted on a downhole centralizer with spring elements mounted on it in the radial direction, characterized in that, in order to improve measurement accuracy and simplify In the master, the through central hole is made in which the plumb string is placed, and the levels are fixed on the mandrel in the same horizontal plane displaced relative to its central axes, the coil being mounted on the upper end of the body with the possibility of moving in two mutually pedicable directions x, the tomb is connected to the body with flexible threads and the downhole centralizer is made in the form of a long rod, in the upper part of which spring elements are fixed Ј4 5 V I.Shulla Compiled by A. Tsvetkov Tehred M. Morgental 5-5 / 4pN 2 r | ЈЈ ptn | llil || iii | nn |; i | | i | TT rnT Tn TO ---- | ijTTirjTij  SW5 Proofreader M. Demchik