SU1448034A1 - Logging elevator - Google Patents

Abstract

This invention relates to field geophysics. Purpose - increase. accuracy of maintenance and smoothness of adjustment of a given speed of the downhole tool. The lift contains a hydraulic pump (GN) t variables-. performance with a rotary housing associated with the drive motor 2 and the hydraulic motor 3 connected to the drum 4. The elevator also contains $ 8 sabers 5 with the downhole tool 6, the control unit 7, including the control panel 8 and the sensor 9 for depth and speed, Last connected to the first input of the block CO 4a 4: 00 o 00

Description

10 depth and speed controls. The lift has a sensor 11 position of the rotary body of the hydraulic pump, a microcontroller 12 with a buffer unit 13, an electric motor 14 with power amplifier 15 and a gearbox 16. The lift also has generators 17 and 18 pulses, elements AND 19, 20, 22, 23, elements OR 21, 24 The linear motion of the cable 5 is converted into rotational motion of the sensor 9, the depth information enters the microcontroller 12. When the specified speed reaches the given depth of the instrument on the microcontroller, a zero signal is obtained. When this happens, the motor 14 will stop. The angle of inclination of the housing at this moment sets the capacity of the GN 1, which provides a given speed to the movement of the cable 5. 3 sludge.

one

The invention relates to field geophysics, in particular, to devices for lowering and lifting downhole devices.

The purpose of the invention is to improve the accuracy of maintenance and smoothness of the control of a given speed of movement of the downhole tool.

Figure 1 shows the structural diagram of the logging hoist; Fig. 2 and Fig. 3 show the algorithm for adjusting the speed of the downhole tool.

The logging elevator contains a variable-capacity hydraulic pump 1 with a rotary body, a drive motor 2, a hydraulic motor 3 whose shaft is mechanically connected to the drum 4 on which the logging cable 5 with the well tool 6 and the control unit 7 are wound. The control unit 7 includes a remote control 8, a sensor 9 for depth and speed, the output of which is connected to the first input of the unit 10 for controlling the depth and speed sensor 11 for positioning the swiveling body of the hydraulic pump, microcontroller 12 for the buffer unit 13, electric motor 14 for power amplifier 15, gearbox 16, first 17 and second 18 pulse generators, first 19 and second 20 elements AND, first element OR 21, third 22 and fourth 23 elements AND, second element OR 24. The output of the second element OR 24 is connected to the input of power amplifier 15 first output the second element and LI 24 is associated with the release of the third element

And 22, the second input of the second element OR 24 is connected with the output of the fourth element And 23, the second inputs of the third 22 and fourth 23 elements And are connected with the output of the first element OR 21, the first inputs of the third 22 and fourth 23 And elements are connected to the third and fourth the information outputs of the buffer unit 13 of the microcontroller 12, the first input of the first element OR 21 is connected with the output of the first element AND 19, the second input of the first element OR 21 is connected with the output of the second element And 20, the first input of which is connected to the output of the second generator 18 of pulses. Tue The second input element I 20 is connected to the second information output of the buffer unit 13 of the microcontroller 12e, the first input of the first element 19 is connected to the output of the first pulse generator 17, the second input of the first element I 19 is connected to the first information output of the buffer unit 13 of the microcontroller 12, third inputs the first 19 and second 20 elements AND are associated with the fifth information output of the buffer unit 13.

The output of the sensor 11 of the position of the rotary body of the hydraulic pump is connected to the second input of the depth and speed control unit 10, the output of which through the buffer unit 13 is connected to the data bus of the microcontroller 12. The microcontroller 12 contains a central processing unit (CPE) and a programmable interrupt controller (PEP) , timer, random access memory (RAM), read only memory (ROM), buffer elements and matching logic (not shown).

The depth and speed control unit 10 consists of an analog-code converter and a decimator-former, which uses a constant memory block (not shown),

Logging works as follows.

In preparing the logging elevator control unit 7 for operation, there is no pressure in the hydraulic system of the elevator.

Information about the position of the rotary body of the hydraulic pump 1 is removed from the sensor 11 of the position of the rotary body and is fed to the input of the depth and speed control unit 10. The digital information from block 10 through the buffer block 13 via the data bus enters the microcontroller 12.

The microcontroller 12 in the logging control system operates as follows.

After the power is turned on, the program recorded in the ROM from the zero address starts to run. According to this program, the logging elevator control system is prepared for operation (an interrupt controller and a timer are programmed, a RAM is prepared). Next, an analysis is made of the state of the control system and the installation of the rotary body of the hydraulic pump 1 to zero. After that, the timer expires the pulses corresponding to the sampling step n time, which arrive at the input of the interrupt controller. These signals determine the times for generating the control signals of the motor 14,

The dependence of the velocity on the depth in the RAM is also produced by the signal that is fed to the control panel input.

The program recorded in the microcontroller's ROM 12 corresponds to the presented speed control algorithm (Fig. 2 and Fig. 3). The operation of the microcontroller 12 in the speed control mode depending on the depth is as follows.

After power is turned on, an initial state analysis is performed.

All logging systems. If the turning casing of the hydraulic pump 1 is not at zero, then with the help of the electric motor 14 it returns to the middle position. In this case, the flow rate of the hydraulic pump 1 is zero and the drum 4 with cable 5 does not rotate.

After the arrival of the trigger signal, a determination is made that the current depth corresponds to the depth segment at a given speed. After that, speed control is performed. The magnitude of the error between the current velocity V and

given speed V

MA

equals

liV

V - V.

Ead

20, In order to determine with which acceleration to make the regulation, the difference between uV and a predetermined threshold value Dv is determined, depending on the oscillatory properties of the system:

ubv uV - aVeonst There may be several such threshold values.

30 Depending on the sign of u & V, the speed of movement of the hydraulic pump pivoting body and acceleration of movement are determined. The uV sign indicates the direction of movement of the swivel body.

Thereafter, the difference between the LY and the speed determined by the deadband, is determined:

35

40

45

A & V - & uVcon6-fc.

Depending on the sign of this quantity, the motor 14 is supplied with a sequence of control signals either to regulate the speed with low acceleration or to stop the adjustment process.

This process is repeated every time the device operates. Numerically, it is 10 ms.

Depending on the absolute value of the deviation of the rotary body of the hydraulic pump 1 and the sign of the deviation, the microcontroller 12 activates control signals that send gg to the second inputs of the first 19 and second 20 elements through the data bus through the buffer unit 13

Pulse generators 17 and 18 serve to form pulse sequences that determine

50

51

two speeds of rotation of the motor 14... The speed of rotation of the vada of the motor 14 is required. It is determined by control signals from the first and second information outputs of the buffer unit 13.

The direction of rotation of the shaft of the electric motor 14 is set by the control signals that are supplied to the second inputs of the third 22 and fourth 23 elements And from the third and fourth information outputs of the buffer unit 13.

The pulse sequence from the output of the first 17 or second 18 pulse generators is supplied to the power amplifier 15, the amplified signal from which is fed to the windings of the electric motor 14. The shaft of the electric motor 14 through the gearbox 16 is kinematically connected with the rotary body of the hydraulic pump 1. Thus, the rotation of the electric motor shaft 14 changes em tilt of the rotary body of the hydraulic pump 1.

The magnitude of the working fluid supply in the hydraulic system of the logging elevator depends on the angle of inclination of the rotary body of the hydraulic pump 1.

Hydraulic servo-mechanism hydraulic pump 1 - hydraulic engine 3 is designed to control the rotational movement of the drum 4.

The servo-mechanism consists of a hydraulic pump 1 with a variable capacity, driven in rotation by a driving motor 2 at a constant speed, and from a hydraulic motor 3, kinematically connected to the drum 4.

The direction and magnitude of the flow rate at the outlet of the hydraulic pump 1 is regulated in this case by changing the slope of the rotary body of the hydraulic pump 1. The hydraulic fluid 3 converts the flow and pressure of the working fluid into rotational speed and torque at the output shaft of the hydraulic motor 3, which is connected to the drum 4. When passing the rotary body the neutral hydraulic pump 1, the direction of flow of the working fluid in the hydraulic system of the lift changes direction, i.e. the working fluid is reversed, and this, in turn, leads to a change in the direction of rotation of the drum 4 with the cable 5.

After the electric motor i 14 returns the rotary case: the hydraulic pump 1 is in the middle position, in

the hydraulic system of the logging elevator rises pressure, i.e. The logging elevator is ready to perform tripping operations.

Before logging

wellbore depths are known, representing the danger of an emergency shutdown of a downhole tool. These depths are the bottom and bottom of the well, the lower end of the casing, etc.

In addition, the lift operator is familiar with the program of descending and lifting a downhole tool for performing logging operations. Therefore, before starting the lifting operation from the control panel, the operational memory of the microcontroller 12 is loaded with the parameters of the logging tool in the well, i.e. speeds and depths.

The descent of the downhole tool in automatic mode starts at low speed. The rotation of the motor shaft 14 through the gear 16 changes. The tilt of the rotary body of the hydraulic pump 1, which leads to a change in the performance of the hydraulic pump. The change in the performance of the hydraulic pump, in turn, leads to a change in the number of revolutions of the hydraulic motor 3, whose shaft is connected to the drum 4 of the hoist winch.

The linear movement of the cable 5 is converted into rotational movement of the sensor 9 for depth and speed, which is structurally fulfilled in the form of a selsyn sensor. The depth and speed sensor 9 is simultaneously

cable direction sensor.

Information about the depth, speed and direction of movement of the cable 5 through the pin of the data enters the microcontroller 12, where it is analyzed, compared with the set and limit values of the parameters, on the basis of which the necessary control and regulation signals are generated.

When the cable speed 5 reaches a predetermined value at a given depth of the downhole tool, the error signal generated by the microcontroller 12 becomes

equal to zero, which leads to the formation of a control signal at the fifth information output of the buffer unit 13 of the microcontroller 12.

The occurrence of this signal causes the motor 14 to stop,

The angle of inclination of the rotary body of the hydraulic pump 1 at the moment of stopping the electric motor 14 sets the production-ig of the third and fourth elements I, the capacity of the hydraulic pump 1, which provides the specified speed of movement of the logging cable 5.

the first and second elements OR, rather than the position sensor of the rotary body of the hydraulic pump is connected to the second input of the depth control unit

After the completion of the logging work, the pressure in the hydraulic system of the logging elevator is released.

The motor 14 through the gearbox 16 returns the rotary housing of the hydraulic pump 1 in the middle position. This is done to prevent hydraulic shock in the hydraulic system of the lift at the time of the subsequent increase in pressure.

Claims (1)

Invention Formula A logging elevator containing a variable-capacity variable displacement pump with a drive motor and a hydraulic motor connected to the drum, a cable with a downhole tool, a block control, including the remote control 35 connected to the input of the amplifier power and the depth and speed sensor, connected to the first input of the unit control of depth and speed, about what increase maintenance accuracy and 40 the output of which is connected to an electric motor connected through a gearbox with a variable-capacity hydraulic pump with a rotary valve. Smooth control of a given speed of the downhole tool, it is equipped with a position sensor of the rotary body of the hydraulic pump, a microcontroller with a buffer unit, an electric motor with power amplifier and gearbox, the first and second pulse generators, the first, second. the third and fourth elements are AND, the first and second elements OR, and the position sensor of the rotary body of the hydraulic pump is connected to the second input of the depth control unit and speeds, the code of which is connected to the control panel and the microcontroller through a buffer unit, the first and second information outputs of which are connected respectively to the second input of the first element And and the second input of the second element And, the first inputs of which are connected respectively to the first and second pulse generators, the third inputs are connected to the fifth information output of the buffer block, the outputs of the first and second element AND are connected through the first element OR to the first inputs of the third and fourth elements AND, the second inputs of which are connected respectively to the third and fourth informational outputs of the buffer block, the outputs of the third and fourth elements AND through the second element OR the output of which is connected to an electric motor connected through a gearbox with a variable-capacity hydraulic pump with a rotary casing. Apl yifMtf eoeiaternemi mti io Mioto uyueamyu Jj tfhit Yavcmxe / yavcmxe scheschus Ofmenotfiie in loithem