SU1204708A1 - Arrangement for measuring hole depth while drilling - Google Patents

Description

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The invention relates to the control of well drilling, in particular to systems for measuring their depth.

A device is known for measuring the depth of boreholes by an indirect method for the angular displacement of the rollers of a crown block, containing sensitive and defining organs on the crown. block of the drilling rig, the signals from which act on the C 15 scalers.

The disadvantage of this triple device is the need to turn it off for the time of launching operations, as well as to manually measure the length of each drill pipe.

It is also known a device for measuring the depth of a borehole, which contains a shawl block position sensor, a hook weight sensor, a drilling tool motion direction unit, a pulse counter and a correction unit, consisting of a tool movement sensor, an OR NOT circuit, a trigger, a circuit And the comparator t 27.

However, in this device, when braking suddenly when the empty hook block moves down, the weight on the hook can reach a value that exceeds the comparator set point, which will trigger the trigger and cause a depth measurement error.

Closest to the proposed technical entity is a device for measuring squall depth during drilling j containing a winch speed sensor, a hook weight sensor, a logic block, a meter block and a correction block that is connected between the logic block and the meter block, mud pressure indicators and srabatyu no wedge captures C31.

In this device, the resolution for measuring the measurement result is made only when signals are received from the weight sensor on the hook, from the mud pressure indicator. at the input or from the trigger indicator, neither wedge grips.

The disadvantage of the known devices

is the lack of a clear signal from the weight sensor on the hook due to friction

pipe columns against the borehole walls and also due to the occurrence of a piston -og effect when the bit moves in a clay solution. In addition, when using

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the use of wedge grips leads to slipping of the pipes in them, which also creates failures when issuing a signal from the indicator of the wedge grips,

The above drawbacks adversely affect measurement accuracy.

The purpose of the shadow is to increase the accuracy of the measurement.

This goal is achieved by having a device for measuring the depth of a well while drilling, which contains an interconnected logic block, a counter block, a correction block that includes a pulse generator, as well as a hook weight sensor, a mud pressure indicator and a winch speed sensor connected to the block logic, consisting of a manual node for information input, the input of which is connected to the winch speed sensor, and the output - to the pulse distributor whose outputs are connected to the installation inputs, a control trigger trigger catfish and through the first OR circuit and the delay element with the output of the logic unit and the first input of the key, the output of which is connected to the output of the logic unit, and the second input through the second OR circuit is connected to the pressure indicator, both outputs of the reverse control trigger are connected to the outputs of the logic unit, and one of the outputs of the specified trigger is also connected to the first inputs of the two coincidence circuits, the second inputs of which are connected to the output of the decoder zero, the input of which and the outputs of the co-ownership circuits. connected to the outputs of the logic block; it is equipped with a blocking signal for the weight at a given speed of the drillstring movement downwards, consisting of two additional coincidence circuits, a digital comparison device and a trigger, the trigger output connected to the second I-ITM circuit connected; with a weight sensor, a pressure indicator and the input of the first of two additional matching circuits, and the trigger inputs are connected to the output of the specified matching circuit and the output of the digital comparison device, one of the inputs of which is connected to the pulse indicator, and the other input is connected to the output of the first and the inputs of the second additional matching circuits, and the inputs of the latter are connected respectively to the output

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the first OR circuit and one of their outputs of the reverse control trigger.

The drawing shows a functional diagram of the device.

A device for measuring the depth of a well while drilling comprises a winch revolving sensor 1, a hook weight sensor 2, an output mud pressure indicator 3 connected to a logic unit 4 consisting of logic circuits AND 5 and 6j of digital comparison device 7, distributor 8 pulses, manual information input node 9, trigger 10, reverse control trigger 11, OR circuit 12, AND circuit 13, delay element 14, decoder 15 zero, OR circuit 16, key 17, AND circuit 18, counter block 19 consisting of reversible counter 20 Over the face and counter 2 1 Depth depth, correction unit 22 consisting of a reversible counter 23 turns of a rope, a generator 24 pulses of the code dialing panel 25, a key-trigger 26, a driver 27 pulses of the circuit OR 28, an encoder 29, the AND circuit 30, an encoder 31, a pulse counter 32 , the panel 33 of the code set, reversible counter 34 pulses and driver 35 pulses.

The device works as follows.

During the operation, the drilling signals of the winch speed sensor 1 enter the logic block 4 through the device 9 for manually entering information onto the pulse distributor 8, which distributes the pulse of the winch speed sensor 1 through the channels up and down, depending on the direction of its rotation.

The pulses J coming from the distributor 8 pulses to the OR circuit 12 are converted into counting pulses, and the pulses fed to the trigger 11 into signals, which control the reverse of the device counters.

The counting pulses pass through the circuit OR 12, the delay element 14 k is sent to the key 17 and to the counting input of the counter 23, the Key 17 passes it; the pulses, if there is permission from the OR circuit 16. This permission is issued on arrival of signals from the dates

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weight 2, pressure indicator 3 and trigger 10,

When the descent rate is higher than a given one, for example more than 1 m / s, and a signal is 5 Down, counting pulses from the output of the OR 12 circuit go through the AND 5 circuit to the first inputs of the AND 6 circuit and the digital comparison device 7, to the second input of which

10 is a signal with a predetermined frequency that determines a predetermined descent rate from the generator 24 of the pulses of the correction unit 22. If the descent rate is higher than the preset one, then the output of circuit 7 of form F5 is the signal of a logical unit that goes to the second input of trigger 10 and gives permission to record information on the first input, i.e. from the output of the circuit And 6, On the second

The 20 input of Scheme 1 and 6 receives a signal from the weight indicator 2, which occasionally fails due to an excess of the descent speed. In this case, trigger 10 takes a state of logical zero, t, e,

5 remembers and simulates the presence of weight on the hook. If the speed is lower than the set one, a logic zero signal is generated at the output of circuit 7, which returns trigger 10 to the initial state, t, e, a logic unit signal is set at its output. Then the signal from the hook weight sensor 2 goes directly through the circuit OR 16 Thus, blocking of the weight signal failures at the moments of its disappearance resulting from the friction of the tool against the borehole wall is carried out.

Counter 23 produces continuous

0 counting the turns of the rope on the drum of the drawworks, From that counter, signals are received through panel 25 to the encoder 29, the latter has five outputs (according to the maximum number of layers of the cable on the drum of the drawworks), depending on the number of layers of turns of the cable on the corresponding output The encoder 29 has a signal that is fed to the input of the corresponding AND circuit 30.

Pass the key 17, the counting pulses arrive at the shaper 27 pulses of the correction unit 22. The leading edges of the formed pulses are produced by discharge from the tetchik 32 and through

the pulse shaper 35 is read by the counter 21, and the back edges connect the generator 24 through the key-tri1-

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rep 26 to the counting inputs of counters 32 and 34.

The accumulation of fractional pulses of the generator 24 on the indicated counters occurs up to a certain number hi -) t5, corresponding to the number of rope slots on the winch drum. At the moment when the number of pulses on the counter 32 corresponds to the layer number, a signal appears on the corresponding output of the board 31, too. When the signals of the encoders 29 and 31 match the corresponding AND 30 circuit, OR 28, the trigger switch 26 is sent to switching, then the key-trigger 26 interrupts the supply of fractional pulses from the generator 24 to the inputs of counters 32 and 34. With the arrival of each counting pulse, the counter 32 is reset, followed by the start of counters 32 and 34.

Thus, the counter 34 accumulates fractional pulses of the generator 24 to the value of a whole, followed by summing it with the counter 20 through the pulse shaper 35 pulses. This impulse is corrective.

The summation of the counting pulses by the counter 21 is possible only if there is a resolution that comes from the AND 18 circuit when the signals from the reverse control trigger 11 and the zero decoder 15o coincide. The zero decoder 15 outputs a signal if there are KOHTaicTa drilling tools with a face (counter 20 shows 0000).

When the tool is in the position Above the bottom, the coincidence occurs on the diagram And 13 when the tool moves down. In this case, the counter 20 switches to subtraction. When the tool moves upwards, the control signal of the trigger) 1 control of the reverse switches the counter 20 to summation.,

Thus, in the presence of contact of the drilling tool with the face, the counting pulses are read by the counter 2 Depth of the bottom, and in the absence of contact by the counter 20 Above the face. The counter 21 gfi this keeps the same readings.

The readings of the depth of the well and the position of the tool relative to the air flow are measured in meters.

The device for manual entry of information CEC 9 is intended for the initial installation of counters 20,2.1 and 23.

Panels 25 and 33 of the code set are pressed to make corrections when applying different types of winches and when changing the diameter of the rope of the pulley system.

Providing the device with a signal blocking circuit of a weight at a predetermined downward speed of the drill string allows to increase the reliability of measuring the depth of the well by eliminating the failures of the bin counters when the signal disappears from the weight sensor at a high speed of the drill tool when the effective weight of the string decreases. drill drill

tool against the borehole wall.

Thus, accurate measurement of the position of the tool will help prevent accidents, avoid accidents and reduce the time for tripping.

Claims (1)

DEVICE FOR MEASURING DEPTH OF A WELL IN A DRILLING PROCESS, containing interconnected logic block, counter block, correction block, including a pulse generator, as well as a weight sensor on a hook, drilling fluid pressure indicator and winch speed sensor connected to a logic block consisting of a manual input unit information, the input of which is connected to the winch speed sensor, and the output to the pulse distributor, the outputs of which are connected to the installation inputs of the reverse control trigger and through the first OR circuit and the back element Arms - with the output of the logic unit and the first input of the key, the output of which is connected to the output of the logic unit, and the second input through the second OR circuit is connected to the pressure indicator, both outputs of the reverse control trigger are connected to the outputs of the logic unit, and one of the outputs of the specified trigger also connected to the first inputs of two matching circuits, the second inputs of which are connected to the output of the zero decoder, the input of which and the outputs of the matching circuits are connected to the outputs of the logic unit, characterized in that, in order to increase the reliability of the measurement, it It is equipped with a weight signal blocking circuit for a given drill string downward speed, consisting of two additional matching circuits, a digital trigger comparison device, the trigger output being connected to a second OR circuit connected to a weight sensor, a pressure indicator and the input of the first of two additional matching circuits, and the trigger inputs are connected to the output of the specified matching circuit and the output of the digital comparison device, one of the inputs of which is connected to the pulse generator, and the other input is connected to the output of howling and one of the inputs of the second additional coincidence circuits, the inputs of the latter respectively connected to the output of the first OR circuit and a flip-flop iz_ reverser control outputs. SU. „, 1204708 ¹ 1Σ