RU183741U1 - Force reactive torque sensor on the rotor table of a drilling rig - Google Patents

Abstract

The utility model relates to drilling equipment, namely to drilling rigs, in which during the drilling process it is necessary to measure the torque on the rotor, and is used in drilling rigs with chain and cardan drive of the rotor and in turbine drilling. The force measuring reactive moment sensor on the rotor table of the drilling rig includes a force meter connected via transmission to the rotor table. According to a utility model, it comprises interconnected double-sided eyelet 1 for rigidly attaching the sensor to the base of the drilling rig, a strain gauge 3 force with electronics unit 4, a lanyard 5 with a winch 6 for tensioning the drive circuit 7 and a double-sided eyelet 8 for rigidly fastening to the rotor table 9 drilling rig.

The technical result of the utility model is to simplify the process of measuring the reactive moment on the rotor table of the drilling rig. 4 s.p. f-ly, 3 ill.

Description

The utility model relates to drilling equipment, namely to drilling rigs, in which during the drilling process it is necessary to measure the torque on the rotor and is used in drilling rigs with a chain and cardan drive of the rotor and during turbine drilling.

The process of drilling oil and gas wells is characterized by a number of features - the implementation of huge drive capacities due to significant resistance to cutting rocks with a drilling tool and a set of complications during drilling. The increased capacity of drilling rigs, the speed of drilling, the transition to a directional type of well predetermined the need for more sophisticated sensors and monitoring systems for the drilling process.

In the process of drilling a well during rotary drilling, it becomes necessary to control the rotational moment of the drill string. Otherwise, it can lead to emergency situations (tool breakage, wear of the armament of the bit, etc.). Torque can be determined by changing the elastic properties of the shaft, the angle of its twisting, tangential stresses on the surface, by changing the active current of the electric motor.

A well-known drill stand assembly (RU 2021461, class Е21В3 / 04, 194), comprising a rotator, a cardan shaft connected to it, interacting by means of a bevel gear with a rotary table and an elastic measuring element with a tensometric bridge for measuring torque. The measuring element is made of a removable clamp mounted on the driveshaft and placed diametrically opposite stiffeners, interconnected by jumpers and fixed at one end to the driveshaft. Technometric cantilever beams are installed at the free ends of the ribs, interacting with the clamp by means of point stops.

A disadvantage of the known device is the difficulty in determining the reactive moment on the rotor table of the drilling rig due to the need to adjust the measurements taking into account the effects of residual deformation of the driveshaft, vibrations during drilling, as well as the need to take into account the properties of the metal of the driveshaft, which is not just because of the wide ambient temperature range (± 50 ° С) at drilling rigs.

The problem of the utility model is the elimination of these shortcomings.

The technical result of the utility model is to simplify the process of measuring the reactive moment on the rotor table of the drilling rig.

The posed problem and the technical result are achieved by the fact that the force measuring sensor of the reactive moment on the rotor table of the drilling rig includes a force meter connected via transmission to the rotor table. According to a utility model, it contains a interconnected double-sided eyelet for rigidly attaching the sensor to the base of the drilling rig, a strain gauge force sensor with an electronics unit, a lanyard with a handle for tensioning the drive chain and a double-sided eyelet for rigidly mounting the rotor of the drilling rig to the table.

Rigid attachment of the eyes to the base of the rig and to the rotor table is made by welding.

When attaching double-sided eyes to the base of the drilling rig and to the rotor table, the overall dimensions of the width of the eyes are made equal to 60 + 1 mm.

When it is installed on the rotor table, the shoulder formed between the longitudinal axis of the load cell and the axis of rotation of the rotor corresponds to the formula:

,

,

– максимальный момент на роторе (определяется по данным буровой установки), тс·м;Where

- maximum torque on the rotor (determined according to the drilling rig), tf · m;

F = 5 tf - maximum load on the load cell.

The load cell is made in explosion-proof design, type of protection - “Intrinsically safe electrical circuit ia”.

The presence of double-sided eyes for rigid mounting of the sensor to the base of the drilling rig and to the rotor table ensure the sensor is operating under tension with rotor torque.

The strain gauge force sensor is connected to the electronics unit to convert the analog signal to digital and provides power to the strain gauge.

The presence of a turnbuckle with a winder creates the necessary initial chain tension and chain tension in the measuring section in order to ensure the operation of the load meter in the linearity zone of the nominal static characteristic.

Rigid fastening of the eyes to the rotor table of the rig allows to exclude changes in the length of the measuring section, which affects the obtaining of reliable results when measuring the reactive moment on the rotor table.

The observance of the overall dimensions of the double-sided eyes, when they are fastened to the base of the drilling rig and to the rotor table equal to 60 + 1 mm, provides the initial tuning of the chain in the measuring section during drilling due to vibrations.

Maintaining the size of the shoulder formed between the longitudinal axis of the load cell and the axis of rotation of the rotor is necessary to ensure the nominal static characteristics in the entire measurement range.

The utility model is illustrated by drawings, where in FIG. 1 shows a load cell of a reactive moment on a rotor table of a drilling rig, front view; in FIG. 2 sensor, side view; in FIG. 3 diagram of the installation of the sensor on the rig.

The force-measuring reactive moment sensor on the table of the rotor of the drilling rig is made in explosion-proof design, the type of explosion protection is “Intrinsically safe electric circuit ia” and includes interconnected two-way eye 1 for connecting (welding) it to the base 2 of the drilling rig, strain gauge 3 tensile forces with electronics unit 4, lanyard 5 with a winch 6 for tensioning the drive chain 7 and a two-way eye 8 for connecting (welding) it to the table 9 of the rig rotor.

Force measuring the reactive moment on the table of the rotor of the drilling rig operates as follows.

The load cell is a fully intrinsically safe and explosion-proof product and does not contain spark-hazardous circuits. Intrinsic safety of internal circuits is achieved by observing intrinsically safe clearances and creepage distances between conductive elements. The electric circuit of the sensor does not contain elements capable of storing enough energy to ignite explosive mixtures.

Before installing the load cell sensor at the place of operation, it is necessary to install chain 7 to the desired length, securing the outer link with a removable finger 10, while setting the lanyard 5 in the middle position (the distance between the axes of the fingers is approximately 590 mm), for adjustment. The chain length 7 is selected based on considerations of ease of installation, operation and maintenance of the sensor by the drilling personnel.

When installing and operating the load cell, it is necessary to ensure that the operating parameters of the strain gauge 3 force correspond to and are in the ranges of the following values:

Range of measurements of force, kN (tf) 0.5-50 The limits of permissible basic reduced error of force measurement,% ± 1.0 The limits of permissible additional relative error of force measurement, due to temperature deviation environment for every 10ºС from normal conditions,% ± 0.5 DC supply voltage, V from 10 to 15 Consumption current, mA, no more twenty Power consumption, W, no more 0.3 Range of working ambient temperatures, ^о С –50 ... +50 MTBF, h 8000 Output Type: 1-wire digital Dimensions, length × width × height, mm no more than 650 × 115 × 180 Weight kg no more than 15 Mode of operation constant Lifetime 5 years

Double-sided eyelets 1 are welded to the base 2 (to the floor) of the drilling rig or to a fixed support (withstanding loads up to 5 tf), and the double-sided eyelet 8 to the rotor table 9. When choosing the installation location of the double-sided eyes 1 and 8, it is necessary to maintain a size between their sides of 60 + 1 mm, as well as a shoulder L, which is determined by the formula:

,

,

– максимальный момент на роторе (определяется по данным буровой установки), тс·м;Where

- maximum torque on the rotor (determined according to the drilling rig), tf · m;

F = 5 tf - maximum load on the force sensor.

Before installing the force sensor, check the position of the rotor. The rotor housing must be firmly in contact with the side stop 11 from the installation side of the load cell.

There should be a gap of about 1 cm between the rotor and the side stop on the opposite side of the load cell. The gap is necessary for the correct measurement of the moment on the rotor. If there is no gap, then the lateral emphasis 11 will take on part of the load, and the readings of the load cell will be significantly underestimated. The amount of clearance during drilling may vary, but the rotor should not touch the side stop 11.

Install the load cell on the welded eyes 1 and 8. Rotating the lanyard with 5 hands, create a small preliminary tensile force in order to select the gaps in the joints. If necessary, you can use the handle 6. The force at the end of the handle 6 should be no more than 0.5 kg. After pre-tensioning the chain 7, set the knob 6 in the holes of the fingers 10 to prevent spontaneous rotation of the lanyard 5 during drilling due to vibration.

During operation, the load cell must undergo a systematic (shift) inspection, in which it is necessary to check the tightness of the threaded connections, as well as damage to the protective sleeve 12 of the cable.

The force sensor using a tensometric force sensor 3 measures the reactive moment of the rotary table 9 relative to the bed. When installing a load cell, strain gauge 3 must be pre-loaded with zero torque. With increasing torque on the rotor, the tensile force on the circuit 7 will increase, and therefore the tensile force on the load cell.

The signal from the output of the strain gauge sensor 3, proportional to the measured force, is fed to the input of the electronics unit 4, which converts the analog signal to digital and provides power to the strain gauge.

The force-measuring sensor is simple to manufacture and reliable in operation with simultaneous high accuracy in determining the reactive moment on the rotor table of the drilling rig.

At present, the load cell has been field tested and is preparing serial production for the oil and gas industry.

Claims (8)

1. Force-measuring reactive moment sensor on the rotor table of the drilling rig, including a force meter connected by transmission to the rotor table, characterized in that it contains interconnected two-way eyelet for rigidly fastening the sensor to the base of the drilling rig, strain gauge force sensor with an electronics unit, lanyard with a handle for tensioning the drive chain and a double-sided eyelet for rigid mounting to the rotor table of the drilling rig. 2. The load cell according to claim 1, characterized in that the rigid fastening of the eyes to the base of the drilling rig and to the rotor table is made by welding. 3. The load cell according to claim 1, characterized in that when fastening the double-sided eyes to the base of the drilling rig and the rotor table, the overall dimensions of the width of the eyes are made equal to 60 + 1 mm. 4. The load cell according to claim 1, characterized in that when it is mounted on the rotor table, a shoulder formed between the longitudinal axis of the load cell and the axis of rotation of the rotor corresponds to the formula:

, Where

- maximum torque on the rotor (determined according to the drilling rig), tf · m; F = 5 tf - maximum load on the load cell. 5. The load cell according to claim 1, characterized in that it is made in explosion-proof design, type of protection - "Intrinsically safe electrical circuit ia".

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