SU1488662A1 - Well depth pulse shaper - Google Patents

Description

The invention relates to drilling and allows you to increase the accuracy of converting the movement of the pulley rope into depth pulses. Shaper 1 pulses of depth contains a source of 3 light, two pairs of fiber-optic cables (FOC) 4 and 5, photodetectors 17 and 18 and a code element. The code element is designed as an opaque drum 8, in the cavity of which an axis is placed on axis 9.

'3 to n

FIG. 2

3

1488662

four

target disk 10. In the diametrically opposite points of the rim 11 of the disk 10 fixed the ends of the segments of the flexible fiber 12. On the outer side of the drum 8 in the diametrically opposite points are fixed two pairs of cores 13 and 14, as well as 15 and 16 WOK 4 and 5, respectively. The first pair of FOC 4 is connected to the light source 3, and the second pair of FOC 5 is connected to the corresponding photodetectors 17 and 18. A counting pulse appears on the photodetectors 17 and 18 after turning the dial

5 10 at an angle. Angle between neighbors

segments of the light guide 12 must be greater than the angle οί,. The choice of angles between segments of the light guide 12 and pairs of cores WOK 4 and 5 allows you to determine

Yu direction of movement of the rope cable. 2 Il.

The invention relates to the control of technological parameters of drilling and is intended for continuous, measuring the depth of the well during the drilling process. 20

The purpose of the invention is to increase the accuracy of formation.

Figure 1 shows the placement of the elements of the device for measuring the depth of the well; FIG. 2 shows the shaping of the well depth pulses and the block diagram of the recording unit.

Structurally, the device for measuring the depth of the well is made in the form of a pulse shaper 1, which was drilled at a drilling rig 2 at the crown block.

The light to the driver 1 pulses is supplied from the source 3 of the light via fiber-optic twin-core cable 4, and from the driver 1 pulses - via cable 5 to the photodetectors.

6. The outputs of the photodetectors are connected to the inputs of the node '7 registration (figure 1). The pulse former .1 (FIG. 2) is made of a code element in the form of a light-tight drum 8, in the cavity of which an annular disk 10 is placed on axis 9. Axis 9 is kinematically connected with the axis of a drilling crown block. In the rim 11 of the annular disk 10, sections 45 of the flexible light guide 12 are fixed so that the ends of the segments are located at diametrically opposite points of the rim 11. On the outer side of the opaque drum 8, the fiber optic cable 4 and cores 15 and 16 of fiber-optic cable 5. The cores 15 and 16 of cable 5 are connected to photodetectors 17 and 18.

The outputs of the photodetectors 17 and 18 are connected to the inputs of the triggers 19 and 20, respectively.

The signals from the two outputs of the trigger 20 are fed through the differentiating chains 21 and 22 to the first inputs of the elements 23 and 24 of coincidence. The second inputs of the latter are connected to the trigger output 19.

Shaper · works as follows.

The rotation of the crown block roller is transmitted to the annular disk 10, which, in turn, rotates, closes the optical channel: one of the cores (13 or 14) of the fiber optic cable 4 is a segment of the flexible light guide 12 one of the cores (15 or 16) of the fiber optic cable 5. In this case, the attachment point of the core 16 of the cable 5 is offset from the attachment point of the core 15 by an angle o4,. Thus, a counting pulse appears on the photodetectors 17 and 18 after the annular disk is rotated through the angle o4 ,. The angle between adjacent segments of the flexible fiber C4 ₂ must be greater than the angle.

The separation of the cores 15 and 16 of the cable 5 at an angle allows for tracking the direction of rotation of the annular disk 10, i.e. for lowering or lifting a drilling tool. Node 7 registration distributes pulses for addition or subtraction in a reversible counter. Element 23 matches gives pulses from trigger 20 for addition to the counter, and element 24 matches for subtraction.

The use of derivatives of pulses from the output of trigger 20, obtained at the output of differentiating chains 21 and 22, allows you to determine the direction of rotation of the disk 10 and to add or subtract the received pulses, i.e. determine the depth of the well.

⁵ I

While the disk rotation has one sign, the appearance of pulses at the output of the photodetector 18, for example, is ahead of the appearance of pulses at the output of the photodetector 17, and the signals from the differentiating chain 21 pass to the output of the recording node, since they coincide in time with the pulses at the trigger output 19.

When there is a change in the direction of rotation, the pulses from the photodetector. 18 begin to appear later than the pulses from the shaper 17. This results in a coincidence of the pulses from trigger 19 and differentiating chain 22. Thus, with one direction of rotation, pulses from element 23 pass to the output of registration unit 7, and from another element from rotation 24 .

The supply of such sequences to the corresponding inputs of the reversible counter allows to determine by 488662 ⁶

position of the drilling tool in the well and its depth.

Claims (1)

Claim 5 A shaper depth pulse shaper containing a light source, two photodetectors and a code element, 10 different in that, in order to increase the formation accuracy, it is equipped with two pairs of fiber-optic cables, while the code element is designed as a light-proof drum with cavity ring disk, in diametrically opposite points of the rim of which are fixed the ends of the segments of flexible fibers, on the 2θ of the outer surface of the drum in diametrically opposite points are fixed two pairs of window-optic cables, the first of which is connected to the light source 25 and the other to the respective photodetectors. Phie.1