CN2249412Y

CN2249412Y - Defects detector without damage to oil water well tube and rod

Info

Publication number: CN2249412Y
Application number: CN 95216598
Authority: CN
Inventors: 王兆和; 马成文; 周建军
Original assignee: HARBIN MOST-SPECIAL ELECTROCHEMICAL EQUIPMENT FACTORY
Current assignee: HARBIN MOST-SPECIAL ELECTROCHEMICAL EQUIPMENT FACTORY
Priority date: 1995-07-11
Filing date: 1995-07-11
Publication date: 1997-03-12
Anticipated expiration: 2005-07-11

Abstract

The utility model relates to a flaw detection instrument used for detecting the damage degree of oil and water pipes and rods. The utility model can display damaged curve via the CRT of a computer, the output ends A, B of an exciter circuit are connected to the ends of an exiting coil, and the output end of a measuring coil is connected with the input end of the computer. The annular exiting coil and the measuring coil are concentrically arranged on a frame in a column-shaped sealing steel tank so as to form a sensor, and the exciter circuit is composed of a single-phase thyristor semi bridge type rectifying circuit and a thyristor triggering control circuit.

Description

Profit well casing, bar harmless flaw detector

The utility model relates to a kind of detector device that is used to detect profit well casing, bar degree of injury.

At present, the domestic and international not damaged checkout equipment of well casing, bar, be not exist equipment huge, cost an arm and a leg, manipulate complicated such problem, have function singleness exactly, can only carry out the such shortcoming of a kind of damage check.As reflectoscope, can detect after the surface clean that greasy dirt and earth must be covered when detecting is clean.Otherwise testing result is just inaccurate.Eddy current flaw detec for another example can only detector tube, the bar surface damage, and damage can't detect to tube wall.The rotating magnetic field defectoscope then needs to increase slewing, and the defectoscope cost is increased greatly.

The purpose of this utility model is intended to overcome the deficiency of prior art and provides a kind of rational in infrastructure, simple, is easy to use operation, can detect the harmless flaw detector of profit well casing, the various damages of bar.

The CRT of the utility model computing machine shows the damage curve, the output terminals A of its excitation device circuit, B are connected on the terminal (2) of magnetizing coil (1), the output terminal (4) of measuring coil (3) is connected on input end and computer, and the skeleton (6) that magnetizing coil (1) and measurement coil (3) are installed in the garden cylindricality sealing cylinder of steel (5) is with one heart upward formed sensor.The excitation device circuit is made up of single-phase silicon-controlled half-controlling bridged rectifier circuit controllable silicon trigger control circuit.

Single-phase silicon-controlled half-controlling bridged rectifier circuit of the present utility model is by transformer B, diode Z ₁, Z ₂, Z ₅, controllable silicon Z ₃, Z ₄Resistance R ₁, R ₂, R ₃, R ₄, capacitor C ₁, C ₂, C ₃, C ₄Connect and form.

The comparer IC of controllable silicon trigger control circuit of the present utility model ₁, IC ₂Input end be connected in parallel, its output terminal is connected to integrator IC respectively ₃, IC ₄Input end, integrator IC ₃, IC ₄Output terminal be connected to comparer IC respectively ₅, IC ₆Input end, comparer IC ₅, IC ₆Output terminal be connected on triode BG respectively ₁And BG ₂Base stage, pulse transformer M ₁, M ₂Be connected on triode BG respectively ₁, BG ₂Collector on, two-way switch IC ₇Be connected on IC respectively ₃, IC ₄Input, output terminal.

The output terminal of the utility model computing machine is connected to printer.

The utlity model has reasonable in design, simple in structure, be easy to use operation, low cost of manufacture, function congruence advantage, it can detector tube, the various damages of pavilion.

Fig. 1 is the utility model principle of work synoptic diagram;

Fig. 2 is the utility model block diagram;

Fig. 3 is the utility model sensor I outside drawing;

Fig. 4 is the utility model sensor II outside drawing;

Fig. 5 is the utility model sensor broken section structural representation;

Fig. 6 is the single-phase silicon-controlled half-controlled bridge type of the utility model excitation device circuit

Rectification circuit figure;

Fig. 7 is the utility model excitation device circuit controllable silicon trigger control circuit

Figure.

Below in conjunction with accompanying drawing the technical solution of the utility model is further described:

The utility model mainly is to realize nondestructive examination by the sectional area that the method for measuring magnetic flux is measured measured tube, bar.Its principle is as shown in Figure 1: the total magnetic flux by sensor measurement coil (3) is: If pipe, pavilion by a fixed magnetic field H magnetic saturation, when magnetization M is a constant (being that B is a constant), when measuring coil away from the tube head end, can think that the magnetic flux variable is directly proportional with profit well casing, pavilion cross-sectional area variable.That is: Δ

=B Δ S.When coil and pipe, when reed moves to axial, according to electromagnetic induction principle, the induced potential that produces in coil equals: e (t)=-N (d

/ dt), that is: e (t) and d Be directly proportional, that is to say that the value of e is directly proportional with Δ S, therefore, can be by the measurement of e being measured damage sectional area Δ S (mean value of tube wall).Fixedly the saturated magnetization field is to be provided by the excitation device circuit, and the damage signal of sensor is delivered to the computing machine (see figure 2), and needed several data can also print output by printer.

As shown in Figure 2, the utility model is connected and is formed by sensor, excitation device, calculating letter printer four parts.

Shown in Fig. 3,4,5, the n circle of sensor is measured coil (3) and magnetizing coil (1) is installed on the skeleton (6) gentry with one heart. and portion is with the red cylinder of steel in garden (5) sealing, so that every magnetic with prevent the profit immersion.Cylinder of steel can adopt ordinary steel, and neither influence detects effect, has also reduced cost of products.

As shown in Figure 6 excitation device be input as 380V, 50Hz alternating voltage, after transformer B is depressurized to 35V, adopt two controllable silicon Z3 and Z4 to make the single-phase bridge (Z of half control ₁, Z ₂, Z ₃And Z ₄Constitute) full-wave rectification, R ₁C ₁, R ₂C ₂, R ₃C ₃, R ₄C ₄Be overvoltage protection element; C5 is a filter capacitor; because loaded impedance is a band induction reactance; this not only makes output voltage waveforms contain ripple; and this ripple can be by transformer coupled to controllable silicon, and this is equivalent to be mingled with the high frequency composition in supply voltage, thereby makes controllable silicon be difficult to turn-off; phase shift range reduces, and current waveform degenerates.For overcoming above-mentioned shortcoming, the utility model has added fly-wheel diode Z5 in this circuit, can eliminate the problems referred to above.Behind rectifying and wave-filtering, at the output current of output terminals A, B for carrying out the continuously adjustable exciting curent in the 0-15A scope.During practical application, about 7A, can meet the demands.

As shown in Figure 7, the trigger pip of control thyristor operating angle is taken out sinusoidal signal by transformer B secondary winding among Fig. 6 and is added to input end C, D1, D2 are limiter diode, sinusoidal signal is exported square-wave signal behind comparer IC1 and IC2, behind integrator IC3 and IC4, export sawtooth wave, these two integrators are subjected to the control of two-way switch IC7, make integrator IC3 when this half period has sawtooth wave output, and IC4 does not have sawtooth wave output; When following half period IC4 had sawtooth wave output, IC3 did not then have sawtooth wave output.This function of alternately exporting sawtooth wave realizes by two-way switch IC7 short circuit integrating capacitor respectively C6 and C7.The two-way sawtooth wave adds to comparer IC5 and IC6 respectively, its comparative level R15 control, and the output width can be by the rect.p. of R15 adjustment.This rect.p. is respectively by diode D3, D4, triode BG1, BG2, exports SCR trigger pulse behind pulse transformer M1 and M2, and this pulse adds to Z3-g1 and Z4-g2, makes Z3, Z4 conducting respectively, and conduction angle is then adjusted by potentiometer R15.Therefore, by the continuous adjustment that the size (promptly adjusting comparative level by R15) of controlling thyristor operating angle can realize exporting exciting curent 0-15A, satisfied the requirement of sensor to exciting curent.

Computing machine is 386 compatibles, the sensor measurement coil obtain and damage signal can on CRT, show the damage curve, ordinate is set at pipe, rod area damage number percent, abscissa is set at the length of pipe, bar, computing machine can write down the very several of pipe that teams and groups detect, bar, and can store in the teams and groups curve that surpasses alarming line, can also use the printer prints examining report, above the curve and the hole condition analysis chart of alarming line.

The utility model sensor can be designed to two kinds of versions, and a kind of is vertical (as Fig. 3), and it is applicable to that factory carries out carrying out flaw detection to pipe, bar, and pipe, bar horizontal direction move through cell winding; Another kind is horizontal (as Fig. 4), and it is applicable at the well head scene carries out carrying out flaw detection, is implemented in well head pipe, bar are lifted in the process and detect simultaneously.Just can eliminate pipe, the bar of scrapping so at the scene, and change, need not be transported to factory to all pipes, bar and detect, and then pipe, the bar that can continue to use be transported back.Both shorten the engineering time like this, saved expense again.

The utility model does not have specific (special) requirements to measured tube, bar, need not clean its surface, does not influence the detection effect yet.

The utility model can be measured the number percent curve of degree of injury intuitively by the method for detector tube, rod area, and available computers is set the alarming line of wall erosion degree number percent, so that determining this pipe, bar to scrap still continues to use, and it is identical to the inwall damage check result of pipe with the outer wall damage, outside the utility model can accurately detect pipe, bar large tracts of land corrosion damage, can also detect various damages such as hole, hole, vertical facial cleft line, shaft-like damages.

Claims

1, a kind of profit well casing, bar harmless flaw detector, it shows the damage curve by the CRT of computing machine, it is characterized in that output terminals A, the B of excitation device circuit are connected on the terminal of magnetizing coil (1) (2), the output terminal (4) of measuring coil (3) is connected on input end and computer, the skeleton (6) that magnetizing coil (1) and measurement coil (3) are installed in the garden cylindricality sealing cylinder of steel (5) is with one heart gone up the composition sensor, and the excitation device circuit is made up of single-phase silicon-controlled half-controlling bridged rectifier circuit and controllable silicon trigger control circuit.

2, defectoscope according to claim 1 is characterized in that single-phase silicon-controlled half-controlling bridged rectifier circuit is by transformer B, diode Z ₁, Z ₂, Z ₅, controllable silicon Z ₃, Z ₄Resistance R ₁, R ₂, R ₃, R ₄, capacitor C ₁, C ₂, C ₃, C ₄Connect and form.

3, defectoscope according to claim 1 and 2 is characterized in that the comparer IC of controllable silicon trigger control circuit ₁, IC ₂Input end be connected in parallel, its output terminal is connected to integrator IC respectively ₃, IC ₄Input end, integrator IC ₃, IC ₄Output terminal be connected to comparer IC respectively ₅, IC ₆Input end, comparer IC ₅, IC ₆Output terminal be connected on triode BG respectively ₁And BG ₂Base stage, pulse transformer M ₁, M ₂Be connected on triode BG respectively ₁, BG ₂Collector plate on, two-way switch IC ₇Be connected on IC respectively ₃, IC ₄Input, output terminal.

4, defectoscope according to claim 3 is characterized in that the output terminal of computing machine is connected to printer.