SU750049A1 - Apparatus for monitoring well-drilling direction - Google Patents

Description

(54) DEVICE TO CONTROL DRILLING DIRECTION

one

This invention relates to the control of well drilling. It can be used, for example, in controlling the movement of drill bits of auger and drilling machines.

A device for controlling the position of the drill string with respect to a given drilling trajectory is known, described in a method based on the transmission of electromagnetic energy through a developed mountain massif and recording the energy passed through it by the receiver 1.

The disadvantages of this method and device are the inability to determine the coordinates of the drill string relative to a given drilling trajectory and the significant effect of interference on the measurement accuracy. In this way, it is possible to determine only the direction in which the drill bit is currently located relative to the receiver of energy emitted through the drill bit. Geological disturbances, trash noise and anisotropy of the physical properties of the rock mass have lost a significant part of the emitted energy. metal objects (for example, lining workings)

WELLS

in the immediate vicinity of the receiver distorts the distribution of this energy in space and causes interference to the reception of signals.

These drawbacks do not allow the use of a monitoring device for objects (projectiles) located at considerable distances from the receiver, which increase the complexity of the monitoring procedure and make it generally impossible.

A device for monitoring the direction of drilling of wells is known, which includes a transmitter of magnetic energy, receivers for vertical and horizontal deviation of wells, an actuator control unit and an indicator 2.

The disadvantage of the device has a low accuracy of control of the position of the drill string relative to a predetermined drilling trajectory.

The purpose of the invention is to improve the accuracy of control.

Claims (2)

This is achieved by the fact that the device is equipped with two vertical primary units, two secondary units, a secondary unit, two adders, a filter and a switch, the inputs of which are connected to the outputs of the primary unit, to the vertical and horizontal well deviation receivers, and the outputs to the input unit actuators and inputs of adders, the outputs of which are connected to the inputs of the secondary division unit, connected through a filter to the indicator. FIG. Figure 1 shows a device for controlling the position of a drill slug, for example: a screw-auger for underground works: working out a mineral bed; in fig. 2 is a view along arrow A i in FIG. 1 (location of the receivers of electrons; of the magnetic energy at the place of the supposed: output of the drill string). In the reservoir of mineral 1, preparatory workings 2 and 3 were carried out, in the first of which the auger was installed: a groove machine 4 with a drilling rig 5. Based on surveying surveys in the place of the expected exit of the drill shear: vertical control receivers 6 and 7 and horizontal 8 and 9 deviations: scientific research institutes connected to the outputs of the division blocks of voltages 10 and 11, the outputs of which are soy; they are connected to the input of the switch 12 connected by their outputs to the inputs of the adders; 13 and 14, the outputs of which are connected to the input of the secondary division block 15. The output of the secondary division block through the filter 16 connect; It is also connected with the indicator 7. In addition, the output of the switch 12 is connected to the input of the control unit 18, and the transmitter 19 is connected to the drill station 5, which is equipped with the drill string 20. The transmitter 19 can also be installed in the drill de 20, and receivers 6, 7, 8 and 9 in this case can be installed both at the site of the intended projectile exit and at the wellhead. Tray drilling 21 is set by surveying metering. Receivers 6, 7, 8 and 9 are positioned with a certain radius from point 22 (see FIG. 2) of the expected output (input) of the drill string 20. In the simplest case, four receivers can be used. Two of the receivers 6 and 7 are positioned vertically, and the other two receivers 8 and 9 horizontally with respect to the exit point 22 of the drill string 20. The control of the position of the drill bit relative to a predetermined drilling trajectory is dried as follows. When a drill bit 20 is buried in the borehole, a transmitter 19 is turned on. Electromagnetic energy, a passage through the mining array 1 being developed, is recorded by receivers 6, 7, 8 and 9 and is converted into electrical voltage. In the case of following the drill bit 20, strictly along a predetermined drilling path 21, the voltages at the output of receivers b, 7, 8 and 9 and the dividing blocks 10 and 11 will vary to the same degree. When the drill bit 20 deviates from the specified drilling path 21 at the output, the corresponding voltage will change, and their receivers will change. When the vertical deflection of the projectile 20, for example, upwards (see Fig. 2), the voltage increases at the output of the receiver 6 and decreases at the output of the receiver 7. The output signal of the dividing unit 10 will change, the value of which will characterize the relative deflection of the drill 20 from given a drilling path 21. If the projectile 20 deviates horizontally from a given drilling path 21, for example, to the right, the voltage increases at the output of receiver 9 and decreases at the output of receiver 8, and the output signal of dividing unit 11 changes. the simultaneous vertical and horizontal deviations of the drill bit 20, the output nagfs of the dividing units 10 and 11 change simultaneously. Weekend si dividing units 10 and 11 through switch 12 and adders 13 and 14 are fed to dividing dividing unit 15. In the first adder 13, the output voltages of the blocks 10 and 11 are added; in the second adder 14, the same signals are subtracted. Thus, the output of the secondary dividing unit 15 is an electrical voltage proportional to the following relation:. dh-aiU - -atU4 F-Hi. UiUj-UjO where K is the deviation of the drill string from the specified trajectory; Ui, Ua, are the output voltages taking UniU. NIKS 6, 7 and 8, 9 vertical and horizontal deviations from the specified trajectory 21; -Q- is the output signal of the horizontal deviation block 11; The -j-j- output signal of the block does not deviate 10 vertical deviations. In the absence of displacement of the drill bit 20 and equality of the output signals of all receivers, the denominator of the ratio tends to zero, and therefore the output voltage of the secondary division unit tends to the maximum value. The output signal of the secondary dividing unit 15 through the filter 16, designed to highlight the average value of the signal, is fed to the indicator 17, which determines the deviation of the drill bit 20 from the specified drilling trajectory 21, 8, 9 — coordinates of the vertical and horizontal displacements of the drill string from a given drilling trajectory. Measurement results can be used in control systems for guided drilling rigs. Moreover, both intermediate signals from blocks 10 and 11 and final signals from block 16 can be introduced into these systems. In the latter case, the control accuracy will be higher. Use: A monitoring device will significantly reduce the effect of various types of interference on measurement accuracy. By registering not absolute, but relative values of the output voltages of the receivers. Using the measurement results in turn will increase the depth of drilling. By eliminating the possibility of removing the drill string from a given drilling trajectory, it will be possible to reduce the loss of coal in the ground, reduce the amount of preparatory work, and increase the productivity of workers. Apparatus for monitoring the direction of drilling wells, which includes an electromagnetic energy transmitter, vertical and horizontal deviation receivers, an actuator control unit and an indicator, characterized in that it is connected to the outputs of vertical and horizontal deviations of the well to improve the accuracy of control two primary dividing units, a secondary dividing unit, two adders, a filter and a switch, whose inputs are connected to the outputs of the primary division blocks, and the outputs with the input of the control unit of the actuators and the inputs of the adders, the outputs of which are connected to the inputs of the secondary division block connected through a filter to the indicator. The source of information taken into account during the examination 1. USSR author's certificate 385251, cl. G 01 Y 3/00, 1973. 2. Authors certificate of the USSR 145504, cl. E 21 D 13/14, 1962 (prototype).