CN104458561A - Compound probe, device and method for monitoring corrosion of down-hole string on line and in real time - Google Patents
Compound probe, device and method for monitoring corrosion of down-hole string on line and in real time Download PDFInfo
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Abstract
The invention discloses a compound probe for monitoring corrosion of a down-hole string on line. The compound probe comprises a probe body, an electrical resistance probe, and an alternating current impedance probe, wherein the probe body is sleeved by a cylindrical shell; the electrical resistance probe comprises a sealing reference element and a sensitive element, which are in series connection, and materials of the sealing reference element and the sensitive element are the same as that of the down-hole string; the alternating current impedance probe comprises a reference electrode, a working electrode and an auxiliary electrode and forms an electrochemical three-electrode system. Corrosion allowance of the down-hole string is calculated by collecting terminal voltages of the reference element and the sensitive element of the electrical resistance probe; sine wave signals of different frequency points are loaded on the working electrode, and the polarization current of the auxiliary electrode and the polarization potential of the reference electrode are synchronously collected, so as to obtain the polarization resistance of the working resistance, and then the corrosion velocity can be measured. The invention further discloses a monitoring device with the probe and a monitoring method. According to the compound probe for monitoring the corrosion of the down-hole string on line, the monitoring device and the monitoring method, the quick on-line monitoring of the corrosion velocity of a down-hole oil gas sleeve or string can be realized; and the probe, the monitoring device and the monitoring method are suitable for an environment with any mixed medium of oil, water and gas in a down-hole high-temperature high-pressure environment.
Description
Technical field
The invention belongs to oil gas field corrosion monitoring technology field, in particular to a kind of probe, device and method of the on-line real time monitoring for tube and casing in downhole corrosion, be applicable to the high precision on-line corrosion monitoring of any blending agent of Oil, Water, Gas and the assessment of anticorrosive measure in Temperature Deep hyperbaric environment.
Background technology
Along with oil gas field CO
2the large-scale promotion of the tertiary oil recovery technologies such as displacement, by CO
2the deep-well tubing and casing etching problem that the displacement of reservoir oil brings is on the rise, and therefore down-hole on-line corrosion monitoring is as an important process of oil gas field safe working, has caused the great attention of numerous oil and gas production enterprises.
At present, conventional tube and casing in downhole corrosion monitoring adopts the mode of corrosion coupon, carries out corrosion monitoring based on weight-loss method.If application number is disclose a kind of downhole well corrosion monitoring scheme in the Chinese patent literature of 201220476848.8, it comprises step in the annular in inner body wall, multiple interior link group on this interior step, it forms by monitoring link in an interior insulating isolation ring and one, and this link device can monitor oil pipe simultaneously and oil sets annular space corrodes.But, this common weight-loss corrosion evaluation method time and effort consuming, and lacing film must be taken out could evaluate etch state from down-hole, the change of downhole corrosion state cannot be reflected real-time.
In order to overcome the defect of said apparatus, in prior art, there is a kind of scheme utilizing resistance probe to carry out Real-Time Monitoring.Such as, patent documentation CN 101846644B discloses a kind of scheme adopting resistance probe technology to carry out oil and gas pipes on-line corrosion monitoring, it comprises Resistance probe, be provided with in this Resistance probe and be directly exposed to and expose sensitive element as the built-in sensitive element with reference to resistance with as measured resistance in pipeline corrosion environment, wherein built-in sensitive element and expose sensitive element and adopt same material to make.During measurement, by built-in sensitive element with expose sensitive element and carry out synchronous difference voltage sample, calculate the resistance ratio of two elements.The characteristic that the program utilizes the sectional area of tinsel or sheet to increase because of corrosion reduction resistance value, the long-pending change of computing nodes is carried out by measuring its resistance delta, and then obtain metal corrosion and corrosion rate, go for comprising the various working environments such as gas phase, liquid phase, solid phase and flow particles.
But because the principle that realizes of resistance probe is based on Ohm law, its corrosion resolution is lower, and the program is more suitable for the monitoring of long-term corrosion, and is not suitable for fast erosion monitoring, and particularly down-hole hot environment can cause microresistivity survey precision to reduce.
Summary of the invention
For defect or the Improvement requirement of prior art, the invention provides a kind of apparatus and method for down-hole string on-line corrosion monitoring, it is by resistance probe and AC impedance probe, and the coupling of both optimal design and integrated, thus realize the quick on-line monitoring of the corrosion rate of downhole oil gas bushing or tubing string, may be used in the environment of any blending agent of Oil, Water, Gas in the high temperature and high pressure environment of down-hole.
According to one aspect of the present invention, a kind of combined probe for down-hole string on-line corrosion monitoring is provided, it is characterized in that, comprising:
Probe body, it is sleeved in barrel-type casing, and seals with this inner walls face and contact, housing exterior walls and downhole corrosion environmental exposure;
Resistance probe, it comprises sealing and is arranged on reference element in probe body and is arranged in probe body outer and be exposed to the primary element of downhole corrosion environment, and this reference element is connected mutually with the primary element being positioned at probe body and identical with down-hole string material; And
AC impedance probe, it comprises contrast electrode, working electrode and auxiliary electrode, and forms galvanochemistry three-electrode system, and three electrodes are all exposed to corrosion environment, and wherein the material of working electrode is identical with down-hole string;
By the terminal voltage of the reference element and described primary element that gather described resistance probe, obtain the resistance ratio of described primary element and reference element, and then calculate the corrosion allowance of down-hole string; By loading the sine wave signal of different frequent points on described working electrode, and the polarization current of synchronous acquisition auxiliary electrode and the polarized potential of contrast electrode, calculate the resistance value of corresponding frequency accordingly, obtain the polarization resistance of working electrode, and then can corrosion rate be recorded.
As improvement of the present invention, the sine wave signal of the different frequent points of described loading comprises high frequency (100Hz ~ 1000Hz) sine wave signal and low frequency (0.001Hz ~ 0.01Hz) sine wave signal.
As improvement of the present invention, the outer peripheral face of described probe body and barrel-type casing contact internal walls being provided with multiple groove, for accommodating O-ring seal, sealing isolated with the one end contacted popping one's head in corrosion environment and the other end.
As improvement of the present invention, a taper sheath is connected with in the end, one end that barrel-type casing contacts with corrosion environment, this taper jacket surface has multiple aperture, for ensure corrosive medium freely to enter in barrel-type casing and with resistance probe and AC impedance probes touch.
As improvement of the present invention, the other end that described barrel-type casing is relative is provided with the nut of central opening, for closing this barrel-type casing upper end and making cable to pass.
As improvement of the present invention, described probe body is provided with pcb board, it is integrated with the circuit of row relax of going forward side by side for collection signal.
According to another aspect of the present invention, a kind of device for down-hole string on-line corrosion monitoring is provided, it comprises above-mentioned combined probe, and bottom is arranged on the pcb board in the probe body of this combined probe, it is characterized in that, this pcb board is provided with waveform generator, potentiostatic circuit, single-chip microcomputer, multi-channel a/d converter and bidirectional constant source, wherein
Described single-chip microcomputer is connected with described potentiostatic circuit and multi-channel a/d converter respectively, described bidirectional constant source is wired to reference element and the primary element head and end of series connection, the primary element of resistance probe and the current constant of reference element is flow through for maintaining, described potentiostatic circuit two ends are connected with the contrast electrode of described AC impedance probe and working electrode respectively, the AC signal of the different frequency that described waveform generator exports is loaded between contrast electrode and working electrode by this potentiostatic circuit
Described multi-channel a/d converter is connected to the primary element two ends of resistance probe and the two ends of reference element respectively by four ports, synchronized sampling is carried out for the terminal voltage difference after steady current being flowed through to both, and be connected by the contrast electrode of wire and AC impedance probe, working electrode and auxiliary electrode, the alternating voltage (U between working electrode (WE) and contrast electrode (RE)
aC) and the ac current signal (I that exports of auxiliary electrode (CE)
aC) carry out analog to digital conversion by multi-channel a/d converter, the data after the voltage difference of above-mentioned synchronous employing and analog to digital conversion are input to described single-chip microcomputer and process, and obtain the resistance ratio of described primary element and reference element respectively, and alternating voltage U
aCwith ac current signal I
aCbetween Amplitude Ration and phase differential, obtain etching extent by this resistance ratio thus, obtain the impedance spectrum of WE under different frequency by this Amplitude Ration and phase differential and obtain corrosion rate.
As improvement of the present invention, this device also comprises power regulator and well head power supply, the built-in DC-DC conversion chip of wherein said power regulator and linear voltage stabilization chip, the voltage step-down that well head power supply can be provided to corresponding DC voltage, and is powered by all circuit after the voltage stabilizing of linear voltage stabilization chip being pcb board.
As improvement of the present invention, this device also comprises the data collector being arranged on well head, is provided with transceiver in it, and is electrically connected with the described PCB of down-hole, for the data of measurement being sent to the corrosion Surveillance center of far-end, realizes monitoring in real time.
According to another aspect of the invention, a kind of method utilizing the above-mentioned device for down-hole string on-line corrosion monitoring down-hole string to be carried out to etching extent and corrosion rate real time on-line monitoring is provided, comprises the steps:
Described combined probe to be fixed on outside tubing string to be monitored and to send in downhole corrosion environment, and making three electrodes of the primary element in resistance probe wherein and AC impedance probe be exposed in corrosion environment;
Steady current is passed to described resistance probe, and then gathers the voltage difference at described reference element and primary element two ends, obtain the resistance ratio of described primary element and reference element, and then obtain down-hole string etching extent according to Ohm law;
To the sine wave signal described working electrode loading different frequent points, and the polarization current of synchronous acquisition auxiliary electrode and the polarized potential of contrast electrode, calculate the resistance value of corresponding frequency accordingly, and then obtain polarization resistance Zp and the instantaneous corrosion rate of working electrode.
The present invention can be used for carrying out on-line corrosion monitoring to the metal tubing string in the Oil, Water, Gas medium of High Temperature High Pressure down-hole, based on well head data collector and monitoring center software, realizes the remote on-line monitoring of downhole corrosion.Due to the high temperature and high pressure environment under Oil/gas Well, downhole well corrosion monitoring sensor needs to be operated in that temperature is the highest 130 DEG C, in the corrosive atmosphere of pressure 50MPa.Downhole well corrosion monitoring sensor is installed in oil pipe, the data that sensor gathers upload to the data collector on ground by the sheathed cable be fixed on tubing and casing outer wall clip, then by wireless or wire communication mode, upload to central monitoring system, user is stayed indoors and can understand downhole corrosion state at any time, timely regulation and control anticorrosive measure, guarantees the security that Oil/gas Well is produced and economy.
The present invention adopts the integrated corrosion monitoring scheme of resistance probe and AC impedance, wherein, corrosion monitoring process based on AC impedance can reflect the instantaneous corrosion rate change of tubing string in conducting medium fast, and resistance probe then can reflect the change of corroding semi-invariant in gas, liquid two-phase environment.By the combination of instantaneous corrosion rate with corrosion semi-invariant, can reflect because fluid media (medium) condition changes the corrosion rate Rapid Variable Design caused, also can reflect metal material overall corrosion tendency in a long time.
Total etching extent of down-hole string and corrosion rate change in device energy sensitive detection gas phase in the present invention or liquid phase environment, its etching extent measuring accuracy can reach 1/5000 of the resistance probe primary element life-span, and AC impedance probe adopts sine-wave excitation and correlation analysis algorithm, there is stronger antijamming capability, and measuring process is rapid, data reappearance is good, and its instantaneous corrosion rate Measurement Resolution can reach 0.01 μm/a, can reflect the change of downhole corrosion environment fast.Can be used for the corrosion rate of Oil/gas Well sleeve pipe or tubing string in on-line monitoring producing well, and the production of this well need not be interrupted.Specifically, the present invention compared to existing technology tool have the following advantages:
(1) significantly improve the sensitivity of corrosion rate measurement and the reappearance of measurement result based on ac impedance technology, more promptly can reflect the change of etch state than existing method;
(2) integrated based on resistance probe and AC impedance probe, the present invention can monitor etching extent and the instantaneous corrosion rate of tubing string in High Temperature High Pressure gas, the complicated subsurface environment of liquid, compared to existing technology can the more quick and precisely validity of anticorrosive measure under appraisal well;
(3) can realize the Real-Time Monitoring of down-hole string etch state, supvr is stayed indoors can understand downhole corrosion state at any time;
Accompanying drawing explanation
Fig. 1 is the circuit theory schematic diagram according to the downhole well corrosion monitoring device constructed by the embodiment of the present invention;
Fig. 2 is the combined probe structural representation according to the downhole well corrosion monitoring device constructed by the embodiment of the present invention;
Fig. 3 is for according to the downhole well corrosion monitoring apparatus structure schematic diagram constructed by the embodiment of the present invention;
Fig. 4 is for according to the downhole well corrosion monitoring device scheme of installation constructed by the embodiment of the present invention;
Fig. 5 is the resistance probe primary element etching extent curve map over time according to the downhole well corrosion monitoring device constructed by the embodiment of the present invention, and wherein, transverse axis is the test duration, and the longitudinal axis is the corrosion allowance of primary element;
Fig. 6 is the AC impedance probe face electrode instantaneous corrosion rate curve map over time according to the downhole well corrosion monitoring device constructed by the embodiment of the present invention, and wherein, transverse axis is the test duration, and the longitudinal axis is instantaneous corrosion rate;
In all of the figs, identical Reference numeral is used for representing identical element or structure, wherein: 1: waveform generator, 2: real-time clock, 3:Flash memory chip, 4: potentiostat circuit, 5: single-chip microcomputer, 6: communication interface, 7: multi-channel a/d converter, 8: bidirectional constant source, 9: power regulator, 10: well head power supply, 11: corrosion monitoring combined probe, 20:8 ~ 10 heart yearn bundle, 21: teflon annular groove and O-ring seal, 22: polyetheretherketone or teflon casting probe body, 23, 27: the reference element and the primary element that are respectively resistance probe, 24, 25, 26: the contrast electrode being respectively AC impedance probe, working electrode and auxiliary electrode, 30: high strength stainless steel seal head, 31: high strength stainless steel circular cylindrical shell, 32:PCB circuit board, 33: corrosive medium exchanges through hole, 34: stainless steel taper sheath, 40: well head data collector, 41: stainless steel sheathed cable, 42: downhole well corrosion monitoring device, 43: oil pipe, 44: sleeve pipe, 45: oil pipe clip.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
See Fig. 1, downhole well corrosion monitoring device constructed by the embodiment of the present invention comprises down-hole on-line corrosion monitoring device, as accompanying drawing 1, comprise waveform generator 1, real-time clock 2, data-carrier store 3, potentiostatic circuit 4, single-chip microcomputer 5, communication interface 6, multi-channel a/d converter 7, bidirectional constant source 8, power regulator 9, well head power supply 10 and combined monitoring probe 11.
Wherein, waveform generator 1, real-time clock 2, data-carrier store 3, potentiostatic circuit 4, single-chip microcomputer 5, communication interface 6, multi-channel a/d converter 7, bidirectional constant source 8, power regulator 9 are all arranged in PCB 32.
As Fig. 2, combined probe comprises probe body 22, resistance probe and AC impedance probe.Wherein, probe body is sleeved in barrel-type casing 31, and seals with this housing 31 internal face and contact, and housing 31 one end contacts with corrosion environment.Resistance probe comprises sealing and is arranged on reference element in probe body 22 23 and is arranged in probe body 22 outer and be exposed to the primary element 27 of downhole corrosion environment, and the primary element 27 being positioned at probe body 22n is mutually connected and primary element 27 is identical with down-hole string material for this reference element 23.AC impedance probe comprises contrast electrode 24, working electrode 25 and auxiliary electrode 26, and forms galvanochemistry three-electrode system, and three electrodes are all exposed to corrosion environment, and wherein the material of working electrode WE 25 is identical with down-hole string;
As Fig. 3, pcb board 32 and combined monitoring probe 11 are arranged in the high strength stainless steel cylindrical shell 31 of withstand voltage 50MPa, heatproof 150 DEG C, and the two realizes electrical connection by 8 ~ 10 heart yearn bundles 20 (see Fig. 2).
Pcb board 32 there is a high temperature modification C8051F single-chip microcomputer 5, be preferably 8 or 32 high temperature modification single-chip microcomputers 5.This single-chip microcomputer 5 connects waveform generator 1, real-time clock 2,64k ~ 512k bytes data-carrier store 3, potentiostatic circuit 4, RS485 communication interface 6, hyperchannel 16bit ~ 24bit A/D converter 7 (such as hyperchannel 16 or 24 100k Hz A/D converter chips) and power regulator 9 respectively.Above-mentioned all chips are powered by 3.3V ~ 5V power regulator 9, and all chips are all welded on above-mentioned PCB, and pcb board is connected on corrosion monitoring combined probe 11, as accompanying drawing 2 by 8 wires.
Waveform generator 1 is preferably built by 16bit D/A converter and operational amplifier, can export the sine wave table of pre-stored in single-chip microcomputer 5.Under time clock controls, by the sine wave signal of characteristic frequency input potentiostatic circuit 4, and be loaded on the working electrode 25 in AC impedance probe, then the polarization current of auxiliary electrode 26 and the polarized potential of contrast electrode 24 is gathered by the two-way A/D Channel Synchronous in multi-channel a/d converter 7, finally by single-chip microcomputer, correlation analysis is carried out to alternating voltage and current signal, and calculate the resistance value of corresponding frequency.The AC impedance Z under high frequency (100 ~ 1000Hz) and low frequency (0.001 ~ 0.01Hz) two frequency bins measured respectively by single-chip microcomputer
hand Z
l, and then calculate polarization resistance the Zp (=Z of working electrode 25
l-Z
h).Then according to Stern formula, corrosion electric current density Icorr is calculated, Icorr=B/Zp (mA/cm
2), and instantaneous corrosion rate Vcorr, Vcorr=Icorr × 11.74mm/a.Wherein B is Stern coefficient, and value is 26mV ~ 52mV.
Real-time clock 2 preferably adopts PCA8565 clock chip, and exportable pulse signal, for waking up single-chip microcomputer 5 from low-power consumption.
Data-carrier store 6 preferably adopts 32k ~ 256k bytes flash storage, for storing Measuring Time, polarization resistance Z
pand etch rate data.
Communication interface 8 preferably adopts isolated form 485 chip, for instruction and measurement data transmission.
Combined probe comprises 8 cores and draws wire harness (A, B, C, D, E, F, G, H) 20, is connected respectively on resistance probe and AC impedance probe.The sensitive element of resistance probe is made up of the material identical with down-hole string, and has identical corrosive property with down-hole string, and its outward appearance can be thread laminar or cylindric.Resistance probe (is designated as R by reference element
f) 23 and primary element (be designated as R
x) 27 two parts compositions, wherein reference element 23 is sealed in probe inside, and do not corroded, primary element 27 is then exposed to downhole corrosion environment, with down-hole string, same corrosion behavior occurs.AC impedance probe is made up of contrast electrode (being designated as RE) 24, working electrode (being designated as WE) 25 and auxiliary electrode (being designated as CE) 26, composition galvanochemistry three-electrode system.Three electrode outward appearance can be cylindric or circular, and is all exposed to corrosion environment.In three electrodes, the material of WE 25 is identical with down-hole string, and RE 24 can be high purity zinc or MnO
2or Ag/AgCl powder die mould electrode, CE 26 can be stainless steel or titanium alloy material.Probe body 22 is cylindrical, and adopt polyetheretherketone (PEEK) or teflon (PTFE) integral cast, probe body 22 is installed in high-strength stainless steel circular cylindrical shell 31.2 ~ 3 ring grooves are had, for installing PTFE O-ring seal 21, to improve the sealing ability between probe body 22 and high strength stainless steel circular cylindrical shell 31 in the outside of probe body.
The other two-way A/D of the multi-channel a/d converter 7 in Fig. 1 is connected to the resistance probe reference element 23 of combined probe 11 and the two ends (see Fig. 2) of primary element 27 respectively by wire harness.Reference element 23 to be embedded in fire resistant resin and to isolate with external environment; Primary element 27 is exposed in corrosion environment, and the two is made by U-shaped tinsel or thin plate; And resistance value is preferably all between 5 to 50m Ω.Two terminal A of resistance probe, F input end are connected with bidirectional constant source 8, this constant current source adopts high-precision power managing chip, and by single-chip microcomputer 5 control export alternately change nyctitropic 0.1A ~ 0.5A encourage continuous current, when electric current falls by reference to coating-forming voltage when element 23 and primary element 27, by the voltage drop on witness mark element 23 while of multi-channel a/d converter 7 and preposition 64 times ~ 128 times gain amplifiers thereof and primary element 27, the last voltage drop ratio being calculated them by single-chip microcomputer 5, and total etching extent of primary element is converted to according to Ohm law.Corrosion monitoring combined probe 11 is also wired to the contrast electrode 24, working electrode 25 and the auxiliary electrode 26 that are exposed to corrosion environment, and these electrodes can be cylindric or circular, and wherein contrast electrode 24 preferably can by high purity zinc or MnO
2or Ag/AgCl powder die mould electrode is made, working electrode 25 is preferably made by the material identical with down-hole string, and auxiliary electrode 26 is preferably made by stainless steel or titanium alloy.
Resistance probe is by drawing two lead terminal (A in wire harness 20, H) bidirectional constant source 8 is connected to, primary element 27 and the reference element 23 of resistance probe is flow through for maintaining steady current, constant current supply 8 is built-in with power amplifier and relay, the constant current of exportable 100 ~ 500mA, direction of current is then by Control, and power amplifier and relay all control by the instruction of single-chip microcomputer 5.Multi-channel a/d converter 7 is the A/D of 16 ~ 24, sigma-delta type, adopt 4 passage Differential Input, be connected to the primary element 27 of resistance probe and the two ends of reference element 23 by B, F and the F in extraction wire harness 20, G lead terminal, and synchronized sampling is carried out to the terminal voltage difference on two elements.For improving precision, measuring process have employed the oversampling technique of 128 ~ 1024 times.Voltage measurements is sent to single-chip microcomputer 5, and then calculates primary element 27 and the resistance ratio of reference element 23 by the radiometer of two wire-end voltages, utilizes Ohm law to be converted to corrosion allowance.
Have the sine waveform table of 16 ~ 64k byte in single-chip microcomputer 5, exported the AC signal of different frequency by the D/A converter in waveform generator 1 according to waveform table, and be loaded between the WE 25 of AC impedance probe and RE 24 by potentiostatic circuit 4.Alternating voltage (U between WE and RE
aC) and auxiliary electrode (CE) 26 export ac current signal (I
aC) carry out digitizing by multi-channel a/d converter 7, finally by means of correlation integral algorithm, calculate U
aCwith I
aCbetween Amplitude Ration and phase differential, obtain the impedance spectrum of WE 25 under different frequency thus.Impedance measurements is saved in flash storage storage 3, is also sent to geoceiver by communication interface 6.
The one-piece construction of downhole well corrosion monitoring device is as accompanying drawing 3.Wherein corrosion monitoring sensor 11 is fixed in a stainless steel circular cylindrical shell 31, and the preferred external diameter of this right cylinder is 25 ~ 35mm, and internal diameter is 20 ~ 30mm.The extension line of probe 11 is connected to pcb board 32, this pcb board is welded with all electron devices included but not limited in accompanying drawing 1.At the top of stainless steel right cylinder 31, be threaded connection one 1/4 " stainless steel sealing nut 30, sealing nut central aperture, can be used for passing through sheathed cable.2 ~ 4 grades of PTFE O-ring seals are adopted to realize sealing between this circular cylindrical shell 31 inwall and combined probe 11 outer wall.In the bottom of right cylinder 31, be connected with a taper sheath 34, this taper jacket surface has many apertures 33, can ensure that corrosive medium freely flows through probe 11, make downhole corrosion medium fully can contact resistance probe in combined probe 11 and AC impedance probe, guarantee that corrosion monitoring combined probe can truly reflect downhole corrosion state.Stainless steel right cylinder 31 is by the O-ring seal 21 outside the seal 30 at top and the corrosion monitoring sensor 11 of bottom and probe; form a highly airtight space; for pcb board 32 provides good protection, guarantee corrosion monitor reliably working in the high temperature and high pressure environment of down-hole.
The primary power of downhole well corrosion monitoring device is provided by power regulator 9, the built-in DC-DC conversion chip of power regulator 9 and linear voltage stabilization chip, 24 ~ 48V voltage step-down to 4 that well head power supply 10 can be provided ~ 6V DC voltage, being 3.3V by linear voltage stabilization chip by its voltage stabilizing again, is all analog/digital chip power supplies on pcb board 32.Adopt real-time clock 2 to realize self-timing in the circuit of downhole well corrosion monitoring device and wake measurement up, adopt the Voltagre regulator that can turn off, during non-measured, close feed circuit, to reduce power consumption.
The mounting means of downhole well corrosion monitoring device in oil well is see Fig. 4.Be provided with data collector 40 at well head, this transceiver is powered by well head power supply 10, has wireless transmitter module in transceiver 40, measurement data can be sent to the corrosion Surveillance center of far-end.Well head transceiver 40 is connected by sheathed cable 41 with downhole well corrosion monitoring device 42 of the present invention and realizes data communication, also powers to downhole well corrosion monitoring device 42 by sheathed cable 41 simultaneously.Sheathed cable 41 is fixed on outside oil pipe 43 by clip 45 when oil pipe 43 times well operations.Described downhole well corrosion monitoring device 42 is installed in the annular space between oil well casing 44 and oil pipe 43, also can be fixed in the tail pipe of oil pipe.Downhole well corrosion monitoring device 42 is fixed on a certain key position of annular space, measured resistance probe and AC impedance corrosion data are then sent to well head transceiver 40 in real time by sheathed cable 41, and be sent to corrosion Surveillance center by wireless or cable network, facilitate managerial personnel to check on-the-spot corrosion condition whenever and wherever possible.
Downhole well corrosion monitoring device 42 with one removing shaft bottom during oil pipe 43 operation, and is fixed in the oil well on distance the darkest 4000 meters of ground.This device carries out communication by RS485 four-core stainless steel cable 41 and well head data collector 40, and is powered by the latter.Stainless steel cable 41 is fixed on oil pipe 43 outer wall by clip 45.Data are sent to central monitoring system by wireless or wire signal by the data collector 40 of well head, make supvr can check downhole corrosion situation whenever and wherever possible.
This downhole well corrosion monitoring device is immersed in simulating oil field produced water, measure the corrosion allowance curve over time of primary element 27 in compound corrosion monitoring sensor 11, see Fig. 5.The visible prolongation along with the time, the primary element corrosion allowance be exposed in corrosion environment declines in time and linearly.The curve that the instantaneous corrosion rate that Fig. 6 then shows working electrode 25 in the AC impedance probe simultaneously measured increases in time and progressively, shows, along with corrosion product is in the accumulation of working electrode surface, the instantaneous corrosion rate of electrode progressively to be declined.The instantaneous corrosion rate measured respectively in conjunction with two kinds of methods and corrosion allowance, can more fully characterize and the sample general corrosion state in gas, liquid complex environment of down-hole string with material.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. for a combined probe for down-hole string on-line corrosion monitoring, it is characterized in that, comprising:
Probe body (22), it is sleeved in barrel-type casing (31), and seals with this barrel-type casing (31) internal face and contact, and barrel-type casing (31) contacts with corrosion environment;
Resistance probe, it comprises sealing and is arranged on the reference element (23) in probe body (22) and is arranged in probe body (22) and be exposed to the primary element (27) of downhole corrosion environment outward, and this reference element (23) is connected with primary element (27) and the two is all identical with down-hole string material; And
AC impedance probe, it comprises contrast electrode (24), working electrode (25) and auxiliary electrode (26), and form galvanochemistry three-electrode system, three electrodes are all exposed to corrosion environment, and wherein the material of working electrode (25) is identical with down-hole string;
By the terminal voltage of the reference element (23) Yu described primary element (27) that gather described resistance probe, obtain described primary element (27) and the resistance ratio of reference element (23), down-hole string corrosion allowance can be obtained; By the sine wave signal at described working electrode (25) upper loading different frequent points, and the polarized potential of the polarization current of synchronous acquisition auxiliary electrode (26) and contrast electrode (24), calculate the resistance value of corresponding frequency accordingly, and then obtain the polarization resistance of working electrode (25), and then the instantaneous corrosion rate of down-hole string can be recorded.
2. a kind of combined probe for down-hole string on-line corrosion monitoring according to claim 1, wherein, the sine wave signal of the different frequent points of described loading is respectively high_frequency sine wave signal and low frequency sine wave signal, wherein high_frequency sine wave signal is the signal within the scope of 100 ~ 1000Hz, and low frequency sine wave signal is the signal within the scope of 0.001 ~ 0.01Hz.
3. a kind of combined probe for down-hole string on-line corrosion monitoring according to claim 1 and 2, wherein, described probe body (22) and the outer peripheral face of barrel-type casing (31) contact internal walls are provided with multiple groove, for accommodating O-ring seal, isolated so that one end contacted with corrosion environment of this probe and the other end are sealed.
4. a kind of combined probe for down-hole string on-line corrosion monitoring according to any one of claim 1-3, wherein, a taper sheath (34) is connected with in the end, one end that described barrel-type casing (31) contacts with corrosion environment, this taper jacket surface has multiple aperture (33), for ensure corrosive medium freely to enter in barrel-type casing (31) and with resistance probe and AC impedance probes touch.
5. a kind of combined probe for down-hole string on-line corrosion monitoring according to any one of claim 1-4, wherein, the other end that described barrel-type casing (31) is relative is provided with the nut of central opening, for closing this barrel-type casing (31) upper end and making sheathed cable to pass.
6. a kind of combined probe for down-hole string on-line corrosion monitoring according to any one of claim 1-5, wherein, these (22) are provided with pcb board (32) for described probe, it are integrated with the circuit of row relax of going forward side by side for collection signal.
7. the device for down-hole string on-line corrosion monitoring, it comprises the combined probe according to any one of claim 1-6, and one is arranged on pcb board (32) on the probe body (22) of this combined probe, it is characterized in that, this pcb board (32) is provided with waveform generator (1), potentiostatic circuit (4), single-chip microcomputer (5), multi-channel a/d converter (7) and bidirectional constant source (8), wherein
Described single-chip microcomputer (5) is connected with described potentiostatic circuit (4) and multi-channel a/d converter (7) respectively, described bidirectional constant source (8) is wired to reference element (23) and primary element (27) head and end of series connection, for maintaining the current constant of primary element (27) and the reference element (23) flowing through resistance probe, described potentiostatic circuit (4) two ends are connected with the contrast electrode (24) of described AC impedance probe and working electrode (25) respectively, the AC signal of the different frequency that described waveform generator (1) exports is loaded between contrast electrode (24) and working electrode (25) by this potentiostatic circuit (4),
Described multi-channel a/d converter (7) is connected to primary element (27) two ends of resistance probe and the two ends of reference element (23) respectively by four ports, synchronized sampling is carried out for the terminal voltage difference after steady current being flowed through to both, and be connected by the contrast electrode (24) of wire and AC impedance probe, working electrode (25) and auxiliary electrode (26), the alternating voltage (U between this contrast electrode (24) and working electrode (25)
aC) and the ac current signal (I that exports of auxiliary electrode (26)
aC) carry out analog to digital conversion by described multi-channel a/d converter (7), data after the voltage difference of above-mentioned synchronized sampling and analog to digital conversion are input to described single-chip microcomputer (5) and process, obtain the resistance ratio of described primary element (27) and reference element (23) respectively, and described alternating voltage (U
aC) and ac current signal (I
aC) between Amplitude Ration and phase differential, obtain etching extent by this resistance ratio thus, obtain the impedance spectrum of working electrode (25) under different frequency by this Amplitude Ration and phase differential and then obtain corrosion rate.
8. a kind of device for down-hole string on-line corrosion monitoring according to claim 7, wherein, this device also comprises power regulator (9) and well head power supply (10), the built-in DC-DC conversion chip of wherein said power regulator (9) and linear voltage stabilization chip, the voltage step-down that well head power supply (10) can be provided to corresponding DC voltage, and is powered by all circuit after the voltage stabilizing of linear voltage stabilization chip being pcb board (32).
9. a kind of device for down-hole string on-line corrosion monitoring according to claim 7 or 8, wherein, this device also comprises the data collector (40) being arranged on well head, transceiver (40) is provided with in it, and be electrically connected with the described pcb board (32) of down-hole, for measurement data being sent to the corrosion Surveillance center of far-end, realize monitoring in real time.
10. utilize the above-mentioned device for down-hole string on-line corrosion monitoring down-hole string to be carried out to a method for etching extent and corrosion rate real time on-line monitoring, comprise the steps:
Described combined probe is sent in downhole corrosion environment with tubing string to be monitored, and makes three electrodes of the primary element in resistance probe wherein (27) and AC impedance probe be exposed in corrosion environment;
Steady current is passed to described resistance probe, and then gather the voltage difference at described reference element (23) and primary element (27) two ends, obtain the resistance ratio of described primary element (27) and reference element (23), and then obtain down-hole string etching extent according to Ohm law;
To the upper sine wave signal loading different frequent points of described working electrode (25), and the polarized potential of the polarization current of synchronous acquisition auxiliary electrode (26) and contrast electrode (24), calculate the resistance value of corresponding frequency accordingly, and then obtain the polarization resistance of working electrode (25), and then instantaneous corrosion rate can be recorded.
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