RU2217590C2 - Gear controlling setting depth of pipes in well - Google Patents

Abstract

FIELD: oil and gas industry, control over setting depth of pipe string in well in process of oil and gas production, drilling and repair of wells. SUBSTANCE: gear includes weight transmitter connected to system measuring and converting weight on hook to code, transmitter of movement of rotary drill line connected to system converting movement into two trains of pulses " upward " and " downward " with weights equal to unit of less significant position in depth and system of two reversible counters " setting depth " and " drill pipe connection ". For increase of accuracy and reliability gear is supplemented with computer and circuit for input of settings according to weight, speed and acceleration. Outputs of circuit are connected to one group of inputs of computer and second group of its inputs is coupled to outputs of systems converting weight and movement. Outputs of computer are coupled to inputs of reversible counters " setting depth " and " drill pipe connection " which outputs are connected to corresponding indicators. EFFECT: increased accuracy and simplified design of gear. 1 dwg

Description

The invention relates to the oil and gas industry and can be used to control the depth of descent of the pipe string into the well in oil and gas production, during drilling and well overhaul.

Known devices for measuring the penetration or depth of the well during drilling, containing transducers of displacements of the tackle rope, the angle of rotation of the pulley of the crown block (1) or the speed sensor of the winch (2, 3). To exclude idling moves of the tackle block when building up the pipe string, they use a weight sensor, pressure indicators and actuation of wedge grips, as well as an additional logic circuit.

Changing the dimensions of the elements of the hoisting mechanism included in the measuring circuit is not taken into account by the indicated devices, which leads to the appearance of an error in measuring the depth, length of the pipe string or penetration.

Studies have shown that temperature deformations of the elements of the hoisting mechanism within the operating temperature ranges slightly affect the accuracy of measuring the depth of descent of the pipe string by indirect methods. To the greatest extent, the measurement error is affected by strains of the hoist rope under the action of loads and changes in the diameters of the hoist rope, pulley pulleys and winch drum during manufacture and as a result of wear (1).

The purpose of the invention is to improve the accuracy and simplification of the device. The goal is achieved in that the design is equipped with a solver and a circuit for entering settings for weight, speed and acceleration, while the outputs of the circuits for measuring weight, moving the hoist rope and settings are connected to the inputs of the solver, the outputs of which are connected to the inputs of the reversing depth and build-up meters.

The drawing shows a schematic diagram of the described device.

A device for controlling the depth of descent of pipes into the well contains a sensor 1 for moving the hoist rope, a sensor 2 for weight on the hook, a system 4 for converting the movement of the hoist rope in two sequences of weight pulses when moving "up" and "down" with weights equal to the unit of the least significant digit ( 1 cm or 1 mm); scheme 5 input settings on the weight of the speed and accelerate the movement of the traveling block; a deciding device 6 and a system of reversible counters 7 and 8, respectively, "descent depth" and "build-up" with indicators 9 and 10.

The device operates as follows.

When the elevator is unloaded and its position on the rotor, the device turns on. In this case, the counters and the weight meter are set to zero. Capture the 1st candle and lower it into the well. The weight measurement system 3 fixes the weight of the 1st candle G1 in the resolver 6. At the moment the end of the candle passes the zero mark (rotor level), the operator gives a resolution signal to the reverse depth meter 7. The pulses are counted “down”. At the same time, in the solver, the speed and acceleration of the movement of the candle are calculated and compared with the settings from scheme 5, characterizing their values when approaching the installation of the elevator on the rotor. When the speed decreases and the corresponding settings Vy and Hu are accelerated, the weight control starts, taking into account the setting value Gy. When the elevator is mounted on the rotor, the weight on the hook begins to decrease and with a weight equal to G = G1-Gy, the counter “depth of descent” is turned off, and the counter “build-up” is turned on, recording a downward movement equal to three components: stretching of the hoist rope, deformation (subsidence ) a rotor table and an allowance for release of an elevator. After that, the “build-up” counter changes its state in accordance with the movements of the tackle block to capture a new candle, raise it, install the 1st candle in the coupling, screw the candle and pick up the column to lower the next candle into the well. When the column is picked up with a weight of G = Gl + G2-Gy, the “build-up” counter is turned off, and the “descent depth” counter is turned on. In this case, indicator 10 should show “0”, and indicator 9 - the length of two candles. Further work is similar. Turning on and off the counters occurs with weight

where N is the number of candles lowered into the well.

SOURCES OF INFORMATION

1. V.A. Brazhnikov, V.A. Kuznetsov. Information devices for determining the effectiveness of drilling process control. - M .: "Nedra", 1978, p. 23-26 and 41-48.

2. A.S. USSR No. 648722.

3. A.S. USSR No. 785470.

Claims (1)

A device for monitoring the depth of the descent of pipes into the well, containing a weight sensor connected to the measuring system and converting it into a weight code on the hook, a moving rope movement sensor connected to the system for converting movement in two sequences of up and down pulses with weights equal to unit of the least significant digit in depth, and a system of two reversible counters “descent depth” and “build-up”, characterized in that a decisive device and a setpoint input circuit are introduced to increase accuracy and reliability by weight, speed and acceleration, and the outputs of the latter are connected to one group of inputs of the deciding device, and the second group of its inputs is connected to the outputs of the systems for converting weight and displacement, in turn, the outputs of the deciding device are connected to the inputs of the reversing counters “descent depth” and “ building ”, the outputs of which are connected to the corresponding indicators.

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