SU785470A2 - Device for measuring borehole depth while drilling - Google Patents

Description

one

The invention relates to the oil industry, in particular to the technique of measuring the depth of boreholes.

According to the main author. St. No. 6,872,22 discloses a device for measuring the depth of a well during drilling, comprising a winch speed sensor, a hook weight sensor, a logic unit consisting of a manual information input unit, a pulse distributor, a maximum pulse width selector, a reverse control trigger, an OR circuit, and , delay node of the decoder, descrambler zero, key, block of counters, including reversible counter "Over the face and counter" Depth of the bottom, correction unit, consisting of a reversible counter of layers of the rope, fractional impulse generator Ls, Code Dialing Panels, Key - Trigger, Pulse Driver, OR Schemes, Encoder, AND Schemes, Pulse Counter, Reverse Pulse Counter Code Dialing Panels, and Pulse Driver 1.

The disadvantage of this device is that when drilling inclined wells, the weight sensor of the drilling tool on the hook does not give a clear signal due to the friction of the drilling tool against the borehole walls.

The purpose of the invention is to increase the reliability of the device in operation.

The goal is achieved. The device is equipped with a pressure indicator and a wedge pickup trigger indicator, and the logic unit is equipped with an additional OR circuit, while the indicator outputs are connected via the input of the additional circuit OR to the input of the logic unit key,

10 and to the other input of the additional circuit OR the output of the selector of the maximum pulse duration is connected. connected to the output selector maximum pulse duration.

The drawing shows a schematic diagram of the described device.

A device for measuring the depth of a well during drilling process includes a winch speed sensor, a hook weight sensor 2, a drilling fluid inlet pressure indicator 3; the indicator 4 for the operation of the wedge grippers, the logic block 5 consisting of the distributor 6 pulses, the node 7 for manually entering information, the selector 8 for the maximum pulse duration, three

rej) a 9 reverse control, OR 10 schemes, AND 11 schemes, decoder delay node 12, decoder 13 zero, OR 14 schemes, key 15, AND 16 schemes; block 17 counters, from the reversible counter- “Over the slaughter 18, and counter“ Depth of the slab 19; a correction unit 20 consisting of a reversible counter 2 turns of a rope, a generator 22 fractional pulses, a code dialing 23, a key-trigger 24, a driver 25 pulses, an OR circuit 26, an encoder 27, AND 28 circuits, an encoder 29, a pulse counter 30 “Panel 31 of the code set for the reversible counter of 32 pulses and forwards of the device of 33 pulses.

The device works as follows.

During the drilling operation, the signal from sensor 1 goes to block 5 through node 7 to distributor b, which distributes the pulses of sensor 1 through the channels Up and Down, depending on the direction of its rotation.

The pulses coming from the distributor 6 to the OR 10 circuit are counting, and the pulses to the trigger 9 are converted into signals that control the device's M counter.

The counting pulses pass through the circuit OR 10, the delay node 12 and arrive at the key 15 and the counter input of the counter 21. The key 15 transmits the impulses if there is permission from the OR circuit 14. This permission is given by the arrival of signals from the sensor 2, from the indicator 3 or from indicator 4.

The counter 21 produces a continuous count of the turns of the rope on the drum of the drawworks. Signals are received from this counter through panel 23 to the encoder 27. The encoder 27 has five outputs (according to the maximum number of cable layers per drawworks 6apa6aFie). Depending on the layer number of the turns of the cable, the signal that arrives at the corresponding AND circuit 28 appears at the corresponding output of the encoder 27.

Pass key 15, the counting pulses. Enter the pulse generator 25 of the correction unit 20. The leading edges of the generated pulses reset the counter 30 and through the pulse driver 33 are counted by the counter 19, and the back edges connect the generator 22 through the key - trigger 24 to the counting inputs of the counters 30 and 32. The accumulation of fractional pulses of the generator 22 on the indicated counters occurs up to a certain number of rope turns corresponding to the layer number on the drum of the drawworks. At the moment when the number of pulses on the counter 30 will correspond to the number of the layer, the signal at the corresponding output of the tracer 29 also receives a signal. If the signals of the encoders 27 and 2U coincide with the corresponding circuit AND 28, the switching permission will be sent through the OR 26 circuit to the key - trigger 24. Key trigger 24 will interrupt the flow of the microbial impulses from the generator 22 to the input of the counters 30

and 32. With the arrival of each subsequent counting pulse, the counter 30 is reset, followed by the start of the counters 30 and 32.

Thus, the counter 32 accumulates fractional pulses of the generator 22 to an integer value, followed by summing it with the counter 19 through the pulse shaper 33. This pulse is a corrective pulse.

Summation of counting pulses by the counter “Bottom depth 19” is possible only if there is a resolution that comes from the AND 16 circuit. If the signals from the reverse control trigger 9 and the decoder zero 13 coincide. shows “0000). When finding the tool “Above the bottom, the coincidence will occur on the diagram AND 11 when moving, the tool is down. In this case, counter 18 is switched to subtraction. When the tool moves upwards, the control signal of the trigger 9 will switch the counter 18 to summation. Thus, in case of contact of the drilling tool with the bottom hole, the counting pulses are read by the Depth counter for 3 and 19, and if there is no contact by the counter Over the face 8. The counter 19 keeps the same readings.

The readings of the depth of the well and the position of the tool relative to the bottom are read in meters.

 The trigger 9 switches the reversible counters of the device to summation or subtraction during drilling and tripping operations.

The number of fractional pulses per one

J is countable by the formula:

n l --- k,

where {.- the length of one coil of rope in the layer, mm; M is the number of targets (1x pulses per turn of the winch speed sensor;

 - price of one whole impulse, mm.

For the first and subsequent layers, the length of one turn of the E- rope wound on the winch of the U2-2-I winch will be;

B, 2086.0 mm.,

02 2174.0 mm

E., 9 mm, etc.

Then the number of fractional pulses S. For the first and subsequent layers will be: n, 43,, n, etc.

The device for manual input of information 7 is intended for the initial installation of counters 18, 19 and 21.

Panels 23 and 31 are used for the insertion of tuspok when using different types of winches and when changing the diameter of the rope of the pulley system.

The use of input indicators will improve the reliability of the device when drilling vertical and inclined wells.

Claims (1)

Invention Formula A device for measuring the depth of a well while drilling according to the ed. St. No. 648722, characterized in that, for the purpose of To increase its reliability in operation, the eye is equipped with a pressure indicator and a wedge pickup indicator, and 5klok logic is equipped with an additional OR circuit, while the indicator outputs are connected through the input of the additional circuit OR to the input of the key of the logic unit, and the selector output is connected to another input of the additional circuit OR maximum pulse duration. Sources of information taken into consideration. Upon examination 1. USSR author's certificate No. 648722, cl. F 2 47/04, 28.02.79 (prototype).