Device to observe drilling hole walls

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to field-geophysical analysis and can be used for visual control of well walls. Proposed device comprises TV camera with TV receiver interconnected via cable that moves up and down the well driven by special device arranged on top circular platform arranged to rotate in horizontal plane on bottom circular platform and aligned with it. Bottom platform is arranged aligned with the well and rigidly fixed at its mouth. Bottom circular platform upper surface accommodates reversing motor coupled via reduction gear with top circular platform and, via its control input, with reversing motor control unit. TV camera carries light source and laser radiator directed towards well mouth and furnished with optical adapter to transform laser beam projection point into light line passing along bottom circular platform radius to central photo receiver arranged on bottom circular platform edge. LH and RH photo receivers are arranged in symmetry with central photo receiver of the right and left of it. Said receivers are connected to appropriate inputs of control unit that control sense of rotation of aforesaid motor.

EFFECT: constant orientation of produced well wall image with respect to cardinal points.

2 dwg

 

The invention relates to geophysical studies and can be used for visual inspection of the walls of the wells.

A device for inspection of the walls of the borehole containing the light source, the television camera with the centering coils, descent vehicle what is used in the hole on the cable, the receiver of the television image, and the orientation of the borehole walls to the sides of the light [1].

The disadvantage of this device is that it cannot work near sources of electromagnetic radiation, and in wells drilled in rocks containing minerals with magnetic susceptibility.

The closest in technical essence of the present invention is a device for the surveillance of the walls of the borehole containing the light source, a television camera, descent vehicle what is used in the well on a cable pulling-lifting device, ensure that the movement of the cable along the borehole, the receiver of the television image and the system image of the borehole walls to the sides of the light, including laser emitter [2]. This device is taken as a prototype.

The drawback of the prototype is the impossibility of using it to ensure consistency of the orientation of the image on the screen of the TV is as receiver with respect to cardinal directions, due to the inevitable uncontrolled rotational movements of the cable about its axis during the descent and ascent of the TV cameras.

The task of the invention is to provide for continuity in the orientation of the borehole walls on the screen of the television receiver relative to the cardinal directions.

To solve the problem in the device for observation of the walls of the borehole containing the light source, a television camera, descent vehicle what is used in the well on a cable pulling-lifting device, ensure that the movement of the cable along the borehole, the receiver of the television image and the system image of the borehole walls to the sides of the light, including laser emitter, the orientation system of images of the borehole walls are in the form of two parallel arranged coaxially with the bore of the ring platform, the bottom of which is rigidly attached to the wellhead, and the top mounted for rotation in a horizontal plane, and a reversible motor that provides rotation of the top ring platform, three photodetectors installed along the generatrix of the lower ring of the platform and facing the laser emitter mounted on a television camera, a control unit reversible engine, the input of which is connected to the hodam photodetectors, and outputs to the control input of the reversible motor, this trip device is attached to the top circular platform, and the laser emitter is equipped with an optical grating to ensure the transformation of the point of projection of the laser beam in a light line along the radius of the bottom ring of the platform through the center of the photodetectors.

1 shows a block diagram of a device for monitoring the borehole walls, and figure 2 is a view of a still lower circular platform on the side of the well.

Device for observation of the walls of the borehole contains a television camera 1, associated with receiver 2 TV picture cable 3 passing through the trip device 4 in the form of the engine 5 and rotating on its axis of the drum 6. Trip device 4 is attached to the top circular platform 7 installed rotatably in a horizontal plane on the fixed lower annular platform 8. The lower annular platform is located coaxially with the upper circular platform 7, and with the bore 9, the mouth of which it is rigidly fixed. On the upper surface of the lower annular platform 8 is fixed reversible motor 10, through which the gear 11 is connected to the upper circular platform 7, and through its control input from the control block 12 R is versionem engine 10. The television camera 1 placed light sources 13 and the laser emitter 14 directed towards the mouth of the bore 9. On the periphery of the bottom surface of the lower annular platform 8 at the point the line of sight from the laser oscillator 14 has a Central photodetector 15, connected to the first control input unit 12 controls the reversible motor 10. Laser emitter 14 is equipped with the optical head 16, which provides the transformation of the point of projection of the laser beam 17 in light line 18 passing along the radius of the bottom ring of the platform 8 to the Central photodetector 15. On the lower annular platform 8 on one of the ring forming with the Central photodetector 15 left and right symmetrically left the photodetector 19 and the right sensor 20, each of which the active part is directed towards the laser source 14, and its output is connected with the respective managing unit 12 controls the reversible motor 10.

Device for observation of the walls of the borehole works as follows.

In the initial state, the lower annular platform 8 is mounted above the investigated borehole 9 so that the line passing through the center of the platform 8 and the Central photodetector 15, was oriented exactly North-South. Further in the hole 9c through trip device 4 is lowered television camera 1 to a predetermined depth, so engine 5 result in rotational movement of the drum 6 is wound on the cable 3. When illuminated by the light source 13 of the wall of the bore 9 in the form of a corresponding image perceived by the television camera 1 and then reproduced by the receiver 2 of the television image.

So far, the TV camera 1 is located near the mouth of the bore 9, manually oriented so that the laser beam 13, emitted by the laser 14 and the transformed optical head 16 in light line 18, passed through the Central photodetector 15. The presence of a light signal at the Central photodetector 15 leads to the appearance of an electrical signal on the first input unit 12 controls the reversible motor 10. Thus reversing the motor remains stationary, since the orientation of the TV camera 1 match the original.

Upon further lowering of the television camera 1 occurs its rotational movement either left or right from the original position corresponding to the direction of the light beam 18 North-South.

When the camera was rotated to the right, i.e. clockwise direction in figure 2, the light line 18, emitted by the laser 14 with the optical head 16 also moves to the right until, until it crosses the photodetector 20. When the sensor 20 produces at its output elec the historical signal, received by corresponding control input unit 12 controls the reversible motor 10. In the reversible motor 10 generates a rotational movement of the gear 11, which is the upper circular platform 7. The upper circular platform 7 with pulling-lifting device 4, and hence the cable 3, starts to rotate to the left until such time as the light beam 18 does not cross the Central photodetector 15. The signal from the Central photodetector will be available on a first control input of the control block 12, which will stop the reversible motor 10. And thus reverts to the original orientation of the TV camera 1, and hence the image of the walls of the bore 9 to the TV receiver 2.

In the case of the rotation of the camera to the left, i.e. counterclockwise in figure 2, the light line 18 created by the laser from the optical head 16, will move to the left until, until it crosses the photodetector 19. When the sensor 19 produces a signal on the appropriate input unit 12 controls the reversible motor 10. In the reversible motor 10 will create a rotational movement of the gear 11, which is the upper circular platform 7. The upper circular platform 7 with pulling-lifting device 4, and thus the cable 3 will start rotating right up until the light is howling beam 18 does not cross the Central photodetector 15. In this case, as in the case described above, the control block 12 will stop the reversible motor 10, and the original orientation of the TV camera 1 and the image on the TV receiver 2 will be restored.

Thus, the proposed device provides a constant orientation of the images of the borehole walls on the screen of the television receiver relative to the cardinal directions.

Experimental verification of the operability of the device is conducted when videokarta blastholes in OAO Karelsky Okatysh. The review confirmed the expected positive effect of the permanence of the orientation of the borehole walls on the screen of the television receiver relative to the cardinal directions.

Sources of information

1. USSR author's certificate No. 861569, CL. EV 49/00, 1981

2. Patent RU No. 2326243, CL. EV 49/00, B. I. No. 16, dated June 10, 2008

Device for observation of the walls of the borehole containing the light source, a television camera, descent vehicle what is used in the well on a cable lifting device, ensure that the movement of the cable along the borehole, the receiver of the television image and the system image of the borehole walls to the sides of the light, including laser emitter, wherein the orientation system of images of the borehole walls to the sides of the light is and made in the form of two parallel, located coaxially with the bore of the ring platform, the bottom of which is rigidly attached to the wellhead, and the top mounted for rotation in a horizontal plane, and a reversible motor that provides rotation of the top ring platform, three photodetectors installed along the generatrix of the lower ring of the platform and facing the laser emitter mounted on a television camera, a control unit reversible engine, the input of which is connected to the outputs of the photodetectors, and outputs to the control input of the reversing engine, with lifting device attached to the top circular platform, and the laser emitter is equipped with an optical grating to ensure the transformation of the point of projection of the laser beam in light line along the radius of the bottom ring of the platform through the center of the photodetectors.



 

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