CN110079811A - A kind of cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring device and method - Google Patents
A kind of cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring device and method Download PDFInfo
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- CN110079811A CN110079811A CN201910427818.4A CN201910427818A CN110079811A CN 110079811 A CN110079811 A CN 110079811A CN 201910427818 A CN201910427818 A CN 201910427818A CN 110079811 A CN110079811 A CN 110079811A
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- 238000005260 corrosion Methods 0.000 title claims abstract description 253
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
- C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
- C23F13/22—Monitoring arrangements therefor
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Abstract
The invention belongs to the cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring technical field more particularly to a kind of cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring device and methods.The present invention passes through shell, it is connected in shell for providing the underground cathodic protection module of cathodic protection current to pipe string of oil-water well, it is connected in shell for monitoring the downhole corrosion on-line checking module of tube corrosion rate and the setting of ground cathodic protection monitoring and on-line corrosion monitoring module on-line, by configuring ground cathodic protection monitoring and on-line corrosion monitoring module, downhole corrosion on-line checking module and underground cathodic protection module are installed, carry out four steps of downhole corrosion on-line checking module and cathodic protection modular debugging and ground cathodic protection monitoring and the inspection of on-line corrosion monitoring module, it is small to provide a kind of power consumption, guard space is long, effect is good, initial stage Meteorological is low and reliability, the device and method of stability and the high pipe string of oil-water well corrosion protection and detection of accuracy.
Description
Technical field
The invention belongs to the cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring technical field more particularly to a kind of oil
The cathodic protection of tubular column of water well underground and on-line corrosion monitoring device and method.
Background technique
Serious structural strength, ability to bear and the reliability for reducing tubing string is shortened in the damage of pipe string of oil-water well downhole corrosion
The service life of tubing string increases operation risk, threatens oil-water well safety.Pipe string of oil-water well downhole corrosion based on outer wall corrosion,
Cathodic protection is the generally acknowledged effective technology of control external corrosion, and reasonable cathodic Protection Design will effectively extend grease
Well casing column underground service life.Cathodic protection is economical rationality the most, highly effective technical measures.Cathodic protection is a Xiang An
Complete mature aseptic technic, it has strong protective capability, easy construction and investment less, and the feature that protecting effect is good.At present
Cathodic protection equipment is all put it on the ground, and distance protection oil water well down-hole string is remote, is taken up a large area, equipment weight, need to be built special
Power distribution room, at high cost, operational efficiency is low, while oil water well down-hole string corrosion condition unable to monitor, conventional cathodic protection
Be no longer satisfied field demand.
Summary of the invention
The present invention provides a kind of cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring device and method, purpose it
One is to provide the pipe string of oil-water well protection and detection that a kind of power consumption is small, and guard space is long, effect is good, initial stage Meteorological is low
Device and method；The second purpose is to provide the pipe string of oil-water well protection and detection of a kind of reliability, stability and accuracy
Device and method.
To achieve the above object, the technical solution adopted by the present invention is that:
A kind of cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring device, including
Shell；
Underground cathodic protection module, underground cathodic protection module are connected in shell, for providing yin to pipe string of oil-water well
Pole protective current；
Downhole corrosion on-line checking module, downhole corrosion on-line checking module are connected in shell, for monitoring pipe on-line
Column corrosion rate；
Ground cathodic protection monitoring and on-line corrosion monitoring module, ground cathodic protection monitoring and on-line corrosion monitoring module
It is connect with underground cathodic protection module, downhole corrosion on-line checking modular telecommunications number.
The underground cathodic protection module includes communication power supply unit, DC power supply unit, chargeable electricity
Pool unit, adjustable voltage unit, cathodic protection voltage monitoring unit and cathodic protection current monitoring unit；The Alternating Current Power Supply electricity
Source unit is electrically connected DC power supply unit, and DC power supply unit is electrically connected adjustable voltage unit and rechargeable battery list
Member, rechargeable cell cathode are connected with oil water well down-hole string, cathodic protection voltage monitoring unit, cathodic protection current prison
Unit is surveyed to be electrically connected with ground cathodic protection monitoring and on-line corrosion monitoring module.
The communication power supply unit is using AC220V communication power supply, the DC power supply list
Member is using DC30V DC power supply, the rechargeable cell using 24V rechargeable battery, adjustable electric
Press unit using 0~24V adjustable voltage；The DC power supply unit is using adjustable pulsewidth modulation direct current
Power supply.
The pulsewidth modulation electronic direct current divider that the adjustable voltage unit uses；Pulsewidth modulation electronic direct current divider
Including single-chip microcontroller, field-effect tube, display voltage device, current control output size touch screen and external potentiometer composition；The list
Piece machine is electrically connected with display voltage device, current control output size touch screen, and single-chip microcomputer output and high-power FET drive
Dynamic input terminal electrical connection, single-chip microcontroller generate PWM pulsewidth end and the electrical connection of external potentiometer, field-effect tube source terminal and direct current supply
Power supply electricity anode electrical connection, FET drain end and the electrical connection of ground anode well.
The shell both ends are provided with screw thread.
The downhole corrosion on-line checking module includes that sensor and probe integrated unit, anti-corrosion monitoring data acquire
Device unit；The sensor and probe integrated unit be connected on down-hole string outer wall and with anti-corrosion monitoring data collector list
First electric signal connection, anti-corrosion monitoring data collector unit and ground cathodic protection monitoring and on-line corrosion monitoring module electric wire connect
It connects.
The sensor is with probe integrated unit using the resistance of sensor and resistance probe integrated design
Probe sensor；The resistance probe sensor is the probe that metal testing plate is housed.
The ground cathodic protection monitoring and on-line corrosion monitoring module includes that PLC controller and man-machine interface touch
Screen；PLC controller is connect with underground cathodic protection module and underground on-line corrosion monitoring modular telecommunications number.
A kind of cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring method, include the following steps:
Step 1: configuration ground cathodic protection monitoring and on-line corrosion monitoring module；
Step 2: installation downhole corrosion on-line checking module and underground cathodic protection module
It is 73mm that the cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring device, which are connected to outer diameter, and length is
Between tube pump and gas anchor in 800mm tubing string, equipped with the cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring device
Tubing string side is made a call to the hole Ф 8mmm and is sealed in resistance probe sensor insertion hole with sealant, and by sensor by quiet
Electricity bridging conducting wire and pipe string of oil-water well ontology are grounded；
Step 3: downhole corrosion on-line checking module and cathodic protection modular debugging are carried out
It after the completion of step 2, is powered, then carries out underground cathodic protection module and on-line corrosion monitoring modular debugging, well
Lower cathodic protection module and on-line corrosion monitoring module by cathodic protection voltage value, current values and etch rate data, on
Ground cathodic protection monitoring and on-line corrosion monitoring module are passed to, is analyzed and processed and shows；
Step 4: ground cathodic protection monitoring and on-line corrosion monitoring module inspection
Ground cathodic protection monitoring and on-line corrosion monitoring module are opened, the tubing string underground cathode that receiving step three transmits is protected
Voltage, electric current and etch rate data are protected, by ground cathodic protection monitoring and on-line corrosion monitoring module, to the data of receiving
It carries out corrosion rate and corrosion condition calculates, and analyzed, handled according to the position data of acquisition, to judge tube corrosion layer
Ageing state.
Pipe string of oil-water well corrosion rate and corrosion depth in the step four calculate and to the corruption of pipe string of oil-water well underground
Losing layer aging positioning is to obtain with the following method；
According to the situation of resistance probe sensor, pipe string of oil-water well corrosion rate is calculated using following formula:
Metal testing plate corrosion depth H in resistance probe sensor are as follows:
H=r0*{1.0-[1.0-(Rt-Ro)/Rt]1/2,
In formula: r0It is metal testing plate original radius；
R0To corrode preceding resistance value；
RtFor resistance value after corrosion；
Metal testing plate rate of corrosion calculation formula:
V=8760* (H2-H1)/(T2-T1)
In formula: T2-T1For time of measuring interval twice,
H2-H1Difference for the corrosion depth measured twice,
Metal testing plate rate of corrosion is pipe string of oil-water well corrosion rate；
The pipe string of oil-water well corrosion layer is located through following method and obtains:
Pipe string of oil-water well average thickness: Tt=(B1T1-B2T2)/Bt
Wherein: TtTubing string average thickness；
BtAverage magnetic induction intensity in tubing string；
T1Corrode head pipe post thickness；
B1Average magnetic induction intensity before corroding；
T2Tubing string thickness after corrosion；
B1Average magnetic induction intensity after corrosion；
When tubing string average thickness and former tubing string thickness difference are less than 1/10, it is judged as that pipe string of oil-water well corrosion is not serious, when
Tubing string average thickness and former tubing string thickness difference 1/5~1/10, are judged as pipe string of oil-water well serious corrosion；When tubing string is average
Thickness and former tubing string thickness difference are greater than 1/5, are judged as that pipe string of oil-water well corrosion is extremely serious.
The utility model has the advantages that
(1) present invention is by being mounted on one for the combination of both the cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring
It rising, is conveniently mounted between the gentle anchor of pipe string of oil-water well underground tube pump, cathode protecting process is unique on the spot for tubing string cathodic protection,
The features such as power consumption is small, and the long effect of guard space is good, and initial stage Meteorological is low.
(2) present invention monitors oil water well down-hole string corrosion condition and rate, corrosion monitoring rate essence on-line by underground
Degree is high, and the safe operating life of pipe string of oil-water well can be predicted, and provides reliably for the inside and outside guard technology research of pipe string of oil-water well
Method, instruct pipe string of oil-water well using force impressed current cathodic protection reach optimum efficiency, corrode pipe string of oil-water well
To effective control, avoid tubing string that the hidden danger because of corrosion leakage may occur.
(3) present invention establishes pipe string of oil-water well on-line corrosion monitoring system, is replacement, maintenance and the dimension of pipe string of oil-water well
Shield provides scientific basis.
(4) it present invention ensures that pipe string of oil-water well is safe and efficient, even running and environmental protection, opens ensureing that oil field is sustainable
Hair is of great significance.
(5) present invention is easy for installation, and has ensured that pipe string of oil-water well cathodic protection and corrosive effect monitor the reliable of system
Property, stability and accuracy.
The above description is only an overview of the technical scheme of the present invention, in order to better understand technology hand of the invention
Section, and can be implemented in accordance with the contents of the specification, and with presently preferred embodiments of the present invention and attached drawing be cooperated to be described in detail such as below
Afterwards.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is present invention schematic view of the mounting position in down-hole string；
Fig. 2 is operation principle schematic diagram of the present invention.
In figure: 1- oil mend away from；2- oil pipe；3- tube pump；4- be internally connected with pipe string of oil-water well underground cathodic protection module and
The shell of on-line corrosion monitoring module；5- gas anchor；6- starting taper；7- oil reservoir top；8- oil reservoir bottom；The artificial bottom of a well 9-.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
Embodiment one:
A kind of cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring device according to shown in Fig. 1-2, including
Shell；
Underground cathodic protection module, underground cathodic protection module are connected in shell, for providing yin to pipe string of oil-water well
Pole protective current；
Downhole corrosion on-line checking module, downhole corrosion on-line checking module are connected in shell, for monitoring pipe on-line
Column corrosion rate；
Ground cathodic protection monitoring and on-line corrosion monitoring module, ground cathodic protection monitoring and on-line corrosion monitoring module
It is connect with underground cathodic protection module, downhole corrosion on-line checking modular telecommunications number.
In actual use, underground cathodic protection module and downhole corrosion on-line checking module are connected in shell, and
Being mounted on diameter is 73mm, and length is in 800mm tubing string, and both ends are sealed, and tubing string stress levels are 25MPa.Make in tubing string
Setting from top to bottom are as follows: oil is mended away from 1, oil pipe 2, tube pump 3, is internally connected with pipe string of oil-water well underground cathodic protection module and corruption
Shell 4, gas anchor 5, the starting taper 6, oil reservoir top 7, oil reservoir bottom 8, artificial bottom of a well 9 of erosion on-line monitoring module.
Cathodic protection module in underground is used to provide reasonable cathodic protection current to oil water well down-hole string, makes oil water well tube
Column underground, which obtains protecting for a long time, is not corroded；Downhole corrosion monitors module on-line, for monitoring tube corrosion rate on-line.
Ground cathodic protection monitoring and on-line corrosion monitoring module are electrically connected with underground cathodic protection module, underground on-line corrosion monitoring module
It connects, for pipe string of oil-water well cathodic protection current value, potential value and tube corrosion speed data to be monitored online, convenient for searching corrosion
Factor adjusts cathode protecting parameter, pipe string of oil-water well underground is made to reach best cathodes guard mode.The present invention effectively extends oil
The tubular column of water well corrosion failure time limit, has ensured that oil-water well normally produces.
Embodiment two:
A kind of cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring device according to Fig.2, with embodiment one
The difference is that: the underground cathodic protection module includes communication power supply unit, DC power supply unit, can fill
Electric battery unit, adjustable voltage unit, cathodic protection voltage monitoring unit and cathodic protection current monitoring unit；The exchange supplies
Electric power supply unit is electrically connected DC power supply unit, and DC power supply unit is electrically connected adjustable voltage unit and chargeable electricity
Pool unit, rechargeable cell cathode are connected with oil water well down-hole string, cathodic protection voltage monitoring unit, cathodic protection electricity
Stream monitoring unit is electrically connected with ground cathodic protection monitoring and on-line corrosion monitoring module.
In actual use, the technical program can guarantee the acquisition of underground related data and transmission process can stablize,
Safe and efficient progress.
Embodiment three:
A kind of cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring device according to Fig.2, with embodiment one
The difference is that: the communication power supply unit is using AC220V communication power supply, the direct current supply
Power supply unit using DC30V DC power supply, the rechargeable cell using 24V rechargeable battery,
Adjustable voltage unit is using 0~24V adjustable voltage；The DC power supply unit is using adjustable pulsewidth tune
DC power supply processed.
In actual use, the communication power supply unit is passed through 220V AC voltage, by DC power supply
Become direct current 30V, on the one hand powers to rechargeable battery 24V, on the other hand given to adjustable DC device for 0~24V of electricity output
Anode well power supply, detects voltage, electric current by ground cathodic protection voltage monitoring unit and cathodic protection current monitoring unit,
It is sent into ground cathodic protection monitoring and corrosion monitoring unit, shows and controls for cathodic protection voltage, electric current.
Example IV:
A kind of cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring device according to Fig.2, with embodiment one
The difference is that: the pulsewidth modulation electronic direct current divider that the adjustable voltage unit uses；Pulsewidth modulation electronic direct current
Divider includes single-chip microcontroller, field-effect tube, display voltage device, current control output size touch screen and external potentiometer composition；
The single-chip microcontroller is electrically connected with display voltage device, current control output size touch screen, single-chip microcomputer output and high-power field effect
Should pipe driving input terminal electrical connection, single-chip microcontroller generates PWM pulsewidth end and the electrical connection of external potentiometer, field-effect tube source terminal and straight
Flow power supply electricity anode electrical connection, FET drain end and the electrical connection of ground anode well.
In actual use, it is adjusted by external potentiometer, thus it is possible to vary it is single to reach change for electric current and voltage sampling signal
Piece machine exports PWM pulsewidth, so as to change power field effect pipe pole base leakage current angle of flow size.Since field-effect tube is electricity
Pressure controller part adjusts power field effect pipe pole base leakage current angle of flow size, thus it is possible to vary high-power effect pipe source electrode and leakage
Voltage across poles sizes values, to change output voltage values, the mode of the big minor adjustment of the time variant voltage is PWM pulse width modulation manner.Directly
Power supply unit is flowed using the technical solution of adjustable pulsewidth modulation DC power supply, so that range of regulation of the invention
Width, precision is high, and high-efficient and consumption power itself is small.
Field-effect tube is 2000W-3000W field-effect tube using power in the present embodiment.Field-effect tube source terminal and
DC power supply electricity anode electrical connection, drain electrode end and the electrical connection of ground anode well, control the output end arteries and veins of base stage and single-chip microcontroller
Punching electrical connection.
The model NMOS96C of single-chip microcontroller uses in the present embodiment model 80C196KC, field-effect tube use, it shows
The model WRJ-10K composition of model MC12, the use of external potentiometer that voltage device uses, the model that display voltage device uses
The model CMP-2 used for MC12, touch screen.
Embodiment five:
A kind of pipe string of oil-water well underground cathodic protection according to figure 1 and on-line corrosion monitoring device, with embodiment one
The difference is that: the shell both ends are provided with screw thread.
In actual use, shell both ends are provided with screw thread, so that the present invention and tube pump 3, the connection of gas anchor 5 and disassembly are just
Benefit.
Embodiment six:
A kind of cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring device according to Fig.2, with embodiment one
The difference is that: the downhole corrosion on-line checking module includes sensor and probe integrated unit, anti-corrosion monitoring number
According to collector unit；The sensor is connected on down-hole string outer wall with probe integrated unit and adopts with anti-corrosion monitoring data
The connection of Collector Units electric signal, anti-corrosion monitoring data collector unit and ground cathodic protection monitoring and on-line corrosion monitoring module
Electric wire connection.
Preferably the sensor is set with probe integrated unit using sensor is integrated with resistance probe
The resistance probe sensor of meter；The resistance probe sensor is the probe that metal testing plate is housed.
In actual use, downhole sensor and probe integrated unit, measure corrosion rate for resistance probe；Sensing
The corrosion signal of acquisition is sent to online rotten monitoring data collector unit with probe integrated unit by device, becomes to mark by processing
After quasi- RS485 signal, it is sent into ground cathodic protection monitoring and on-line corrosion monitoring module carries out corrosion display and monitoring.This technology
Scheme preferably realizes the function of its detection and data transmission.
Resistance probe sensor is the probe that metal testing plate is housed, in corrosive medium, the cross section of metal testing plate
Product reduces because of corrosion, so that resistance increases, by periodically measuring its resistance, can calculate total corrosion of this time
Amount and corrosion rate.The method is that resistance probe sensor can supervise instantaneous corrosion rate better than hanging slice method place
It surveys and records.
The model CQ-FJ that anti-corrosion monitoring data collector unit uses in the present embodiment.
Embodiment seven:
A kind of cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring device according to Fig.2, with embodiment one
The difference is that: the downhole corrosion on-line checking module includes sensor and probe integrated unit, anti-corrosion monitoring number
According to collector unit；Sensor is connect with probe integrated unit with anti-corrosion monitoring data collector unit electric signal, anti-corrosion prison
Measured data collector unit is connect with remote control module electric wire.
Preferably the sensor is set with probe integrated unit using sensor is integrated with resistance probe
The resistance probe sensor of meter.
In actual use, sensor is electrically connected anti-corrosion monitoring data collector unit, sensor with probe integrated unit
The corrosion signal of acquisition is sent to rotten monitoring data collector unit with probe integrated unit, becomes standard by processing
After RS485 signal, it is sent into ground feeding ground cathodic protection monitoring and corrosion monitoring unit carries out corrosion display and monitoring, preferably
Realize its function.
Embodiment eight:
A kind of cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring device according to Fig.2, with embodiment one
The difference is that: the ground cathodic protection monitoring and on-line corrosion monitoring module includes PLC controller and man-machine interface
Touch screen；PLC controller is connect with underground cathodic protection module and underground on-line corrosion monitoring modular telecommunications number.
In actual use, remote control module real-time monitoring tubular column cathodic protection voltage, electric current and corrosive attack rate,
Corrosion factor is searched, cathode protecting parameter is adjusted, so that the cathodic protection of pipe string of oil-water well underground is reached best cathodes guard mode, prolong
The long pipe string of oil-water well corrosion failure time limit ensures that oil-water well normally produces.
Embodiment nine:
A kind of cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring method, include the following steps:
Step 1: configuration ground cathodic protection monitoring and on-line corrosion monitoring module
Step 2: installation downhole corrosion on-line checking module and underground cathodic protection module
It is 73mm that the cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring device, which are connected to outer diameter, and length is
Between tube pump 3 in 800mm tubing string and gas anchor 5, the cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring device are being housed
Tubing string side make a call to the hole Ф 8mmm and sealed with sealant, and sensor is passed through in resistance probe sensor insertion hole
Electrostatic bridges conducting wire and pipe string of oil-water well ontology is grounded；
Step 3: downhole corrosion on-line checking module and cathodic protection modular debugging are carried out
It after the completion of step 2, is powered, then carries out underground cathodic protection module and on-line corrosion monitoring modular debugging, well
Lower cathodic protection module and on-line corrosion monitoring module by cathodic protection voltage value, current values and etch rate data, on
Ground cathodic protection monitoring and on-line corrosion monitoring module are passed to, is analyzed and processed and shows；
Step 4: ground cathodic protection monitoring and on-line corrosion monitoring module inspection
Ground cathodic protection monitoring and on-line corrosion monitoring module are opened, the tubing string underground cathode that receiving step three transmits is protected
Voltage, electric current and etch rate data are protected, by ground cathodic protection monitoring and on-line corrosion monitoring module, to the data of receiving
It carries out corrosion rate and corrosion condition calculates, and analyzed, handled according to the position data of acquisition, to judge tube corrosion layer
Ageing state.
In actual use, the present invention is by configuring ground cathodic protection monitoring and on-line corrosion monitoring module, installation well
Lower corrosion on-line checking module and underground cathodic protection module carry out carrying out downhole corrosion on-line checking module and cathodic protection mould
Block debugging and four steps of ground cathodic protection monitoring and the inspection of on-line corrosion monitoring module easily drop the present invention and are mounted on oil
In tubular column of water well between tube pump 3 and gas anchor 5, underground uninterruptedly provides reasonable cathodic protection current, protection to pipe string of oil-water well
Distance effect is good, and pipe string of oil-water well is made to obtain protecting for a long time and do not corroded；Underground can monitor tube corrosion on-line simultaneously
Speed data, measures fast response time, and precision is high.Pipe string of oil-water well cathode guarantor can be monitored online in ground remote control module
Electric current, current potential and tube corrosion speed data are protected, convenient for searching corrosion factor, cathode protecting parameter is adjusted, makes pipe string of oil-water well
Reach best cathodes guard mode, extend the pipe string of oil-water well corrosion failure time limit, ensures that oil-water well normally produces.
Embodiment ten:
A kind of cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring method, the oil water well tube in the step four
Column corrosion rate and corrosion depth calculate and are to obtain with the following method to pipe string of oil-water well downhole corrosion layer aging positioning；
According to the situation of resistance probe sensor, pipe string of oil-water well corrosion rate is calculated using following formula:
Metal testing plate corrosion depth H in resistance probe sensor are as follows:
H=r0*{1.0-[1.0-(Rt-Ro)/Rt]1/2,
In formula: r0It is metal testing plate original radius；
R0To corrode preceding resistance value；
RtFor resistance value after corrosion；
Metal testing plate rate of corrosion calculation formula:
V=8760* (H2-H1)/(T2-T1)
In formula: T2-T1For time of measuring interval twice,
H2-H1Difference for the corrosion depth measured twice,
Metal testing plate rate of corrosion is pipe string of oil-water well corrosion rate；
The pipe string of oil-water well corrosion layer is located through following method and obtains:
Pipe string of oil-water well average thickness: Tt=(B1T1-B2T2)/Bt
Wherein: TtTubing string average thickness；
BtAverage magnetic induction intensity in tubing string；
T1Corrode head pipe post thickness；
B1Average magnetic induction intensity before corroding；
T2Tubing string thickness after corrosion；
B1Average magnetic induction intensity after corrosion；
When tubing string average thickness and former tubing string thickness difference are less than 1/10, it is judged as that pipe string of oil-water well corrosion is not serious, when
Tubing string average thickness and former tubing string thickness difference 1/5~1/10, are judged as pipe string of oil-water well serious corrosion；When tubing string is average
Thickness and former tubing string thickness difference are greater than 1/5, are judged as that pipe string of oil-water well corrosion is extremely serious.
Metal testing plate rate of corrosion is pipe string of oil-water well corrosion rate, has effectively reacted the speed of pipe string of oil-water well corrosion
Degree.
Embodiment 11:
As shown in Figure 1, the present embodiment provides installation methods of the invention.It, will be internal in the operation of new oil-water well or well workover
It is connected with the shell of cathodic protection module and on-line corrosion monitoring module, is mounted between tube pump 3 and gas anchor 5.Cathodic protection dress
It sets and uninterruptedly provides reasonable cathodic protection current to pipe string of oil-water well underground on the spot, the long effect of guard space is good, makes oil-water well
Tubing string, which obtains protecting for a long time, not to be corroded；It is monitored in situ tube corrosion speed data, measures fast response time, precision is high.
Ground tubing string cathodic protection and corrosion rate monitor unit on-line, and pipe string of oil-water well underground cathodic protection electricity can be monitored online
Stream, current potential and tube corrosion speed data search corrosion factor, adjust cathode protecting parameter, reach oil water well down-hole string
Best cathodes guard mode extends the oil water well down-hole string corrosion failure time limit, ensures that oil-water well normally produces.
Oil-water well carries out tubing string cathodic protection and on-line corrosion monitoring method includes the following steps:
1) ground tubing string cathodic protection voltage, electric current and on-line corrosion monitoring unit are carried out and configures the cathodic protection of ground tubing string
With on-line corrosion monitoring unit mainly by PLC controller, the composition such as person-computer union.It can real-time monitoring tubular column cathodic protection
Voltage, electric current and corrosion rate situation carry out tubing string cathodic protection voltage, electric current and etch rate data and show, store and report
The functions such as announcement, data calculating, emergency review, sequence of events recording and parameter early warning are the steady in a long-term of pipe string of oil-water well underground
Operation provides technical support.
2) pipe string of oil-water well underground cathode protection device and on-line corrosion monitoring device are installed
It is diameter by external form is 73mm, length is the cathode protection device and on-line corrosion monitoring device peace of 800mm tubing string
Between the gentle anchor of pipe string of oil-water well underground tube pump, cathode protection device and on-line corrosion monitoring device tubing string side are being housed
The hole Ф 8mmm is made a call to, in the insertion of online resistance probe sensor, is sealed with sealant, what the sealant of the present embodiment used
It is epoxy resin.For the stability and reliability for guaranteeing test result, resistance probe sensor must bridge conducting wire by electrostatic
It is grounded with pipe string of oil-water well ontology.
3) oil water well down-hole string on-line corrosion monitoring device debugging is carried out
Corrosion data is uploaded in ground cathodic protection monitoring and on-line corrosion monitoring module by wireless method, is carried out
The debugging of oil water well down-hole string corrosion monitoring, the measurement accuracy minimum of resistance probe sensor, can be in a few minutes up to 30nm
Or pipe string of oil-water well underground corrosion of metal rate is measured in a few houres, and the change to pipe string of oil-water well underground rate of metal corrosion
Fast reaction is made in change.
4) debugging of pipe string of oil-water well underground cathode protection device is carried out
According to pipe string of oil-water well underground protective current require, cathodic protection current be 4A~5A, adjustment adjustable voltage 0~
24V unit guarantees that the minimum protective potential of tubing string is at least -0.85 volt, and can reach makes metal stop corrosion；There is sulfate also
Opportunistic pathogen participates in the environment of corrosion, and when sulfate radical content is greater than 0.5%, cathodic polarization potential should reach -0.95V or more negative.It is logical
Ground cathodic protection current and voltage monitoring unit are crossed, by wired incoming ground cathodic protection monitoring and on-line corrosion monitoring mould
In block, it is analyzed and processed.
5) ground cathodic protection monitoring and on-line corrosion monitoring module inspection are started to work
The cathodic protection of ground tubing string and on-line corrosion monitoring cell operation are opened, cathodic protection and on-line corrosion monitoring are passed through
Unit can detect down-hole string cathodic protection voltage, electric current and corrosion rate, be able to carry out oil-water well by corrosion rate
Tubing string downhole corrosion calculates and analysis, carries out the positioning of pipe string of oil-water well downhole corrosion layer, and the ageing state of evaluation of corrosion layer sentences knowledge
Tubing string operating parameter, on-line parameter early warning etc..Cathodic protection and on-line corrosion monitoring unit have pipe string of oil-water well downhole detection
The features such as hot spot result is quick, and monitoring data are accurate, unattended, high degree of automation.Effectively prevention tubing string risk of leakage,
Hidden danger because of corrosion leakage may be occurred by avoiding pipe string of oil-water well, so that pipe string of oil-water well corrosion is effectively controlled, extended oil
The Years Of Service of tubular column of water well, it is ensured that pipe string of oil-water well safety in production operation mentions to seek corrosion formulation safeguard procedures
For scientific basis, assesses pipe string of oil-water well and force impressed current cathodic protection effect, realize the corrosion of control pipe string of oil-water well
Process extends the Years Of Service of pipe string of oil-water well, improves the evaluation of pipe string of oil-water well corrosion and protection and operation and management level.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
In the absence of conflict, those skilled in the art can according to the actual situation will be relevant in above-mentioned each example
Technical characteristic is combined with each other, and to reach corresponding technical effect, will not repeat them here particularly for various combined situations.
The above, only presently preferred embodiments of the present invention, the present invention be not intended to be limited to it is shown in this article this
A little embodiments, and it is to fit to the widest scope consistent with principles disclosed herein and novel features.According to this hair
Bright technical spirit any simple modification, equivalent change and modification to the above embodiments, still fall within the technology of the present invention
In the range of scheme.The well-known components and common structure of component and the structure category industry that the present embodiment does not describe in detail are normal
With means, do not describe one by one here.
Claims (10)
1. a kind of cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring device, it is characterised in that: including
Shell；
Underground cathodic protection module, underground cathodic protection module are connected in shell, are protected for providing cathode to pipe string of oil-water well
Protect electric current；
Downhole corrosion on-line checking module, downhole corrosion on-line checking module are connected in shell, for monitoring tubing string corruption on-line
Lose rate；
Ground cathodic protection monitoring and on-line corrosion monitoring module, ground cathodic protection monitoring and on-line corrosion monitoring module and well
Lower cathodic protection module, the connection of downhole corrosion on-line checking modular telecommunications number.
2. a kind of pipe string of oil-water well underground cathodic protection as described in claim 1 and on-line corrosion monitoring device, feature exist
In: the underground cathodic protection module includes communication power supply unit, DC power supply unit, rechargeable battery list
Member, adjustable voltage unit, cathodic protection voltage monitoring unit and cathodic protection current monitoring unit；The communication power supply list
Member electrical connection DC power supply unit, DC power supply unit are electrically connected adjustable voltage unit and rechargeable cell,
Rechargeable cell cathode is connected with oil water well down-hole string, cathodic protection voltage monitoring unit, cathodic protection current monitoring
Unit is electrically connected with ground cathodic protection monitoring and on-line corrosion monitoring module.
3. a kind of pipe string of oil-water well underground cathodic protection as claimed in claim 2 and on-line corrosion monitoring device, feature exist
In: the communication power supply unit is adopted using AC220V communication power supply, the DC power supply unit
It is DC30V DC power supply, the rechargeable cell using 24V rechargeable battery, adjustable voltage list
Member is using 0~24V adjustable voltage；The DC power supply unit is using adjustable pulsewidth modulation direct current
Source.
4. a kind of pipe string of oil-water well underground cathodic protection as claimed in claim 2 or claim 3 and on-line corrosion monitoring device, feature
It is: the pulsewidth modulation electronic direct current divider that the adjustable voltage unit uses；Pulsewidth modulation electronic direct current divider packet
Include single-chip microcontroller, field-effect tube, display voltage device, current control output size touch screen and external potentiometer composition；The monolithic
Machine is electrically connected with display voltage device, current control output size touch screen, single-chip microcomputer output and high-power FET driving
Input terminal electrical connection, single-chip microcontroller generate PWM pulsewidth end and the electrical connection of external potentiometer, field-effect tube source terminal and direct current supply electricity
Source electricity anode electrical connection, FET drain end and the electrical connection of ground anode well.
5. a kind of pipe string of oil-water well underground cathodic protection as described in claim 1 and on-line corrosion monitoring device, feature exist
In: the shell both ends are provided with screw thread.
6. a kind of pipe string of oil-water well underground cathodic protection as described in claim 1 and on-line corrosion monitoring device, feature exist
In: the downhole corrosion on-line checking module includes sensor and probe integrated unit, anti-corrosion monitoring data collector list
Member；The sensor and probe integrated unit be connected on down-hole string outer wall and with anti-corrosion monitoring data collector unit electricity
Signal connection, anti-corrosion monitoring data collector unit are connect with ground cathodic protection monitoring and on-line corrosion monitoring module electric wire.
7. a kind of pipe string of oil-water well underground cathodic protection as claimed in claim 6 and on-line corrosion monitoring device, feature exist
In: the sensor and probe integrated unit is passed using sensor and the resistance probe of resistance probe integrated design
Sensor；The resistance probe sensor is the probe that metal testing plate is housed.
8. a kind of pipe string of oil-water well underground cathodic protection as described in claim 1 and on-line corrosion monitoring device, feature exist
In: the ground cathodic protection monitoring and on-line corrosion monitoring module includes PLC controller and person-computer union；PLC
Controller is connect with underground cathodic protection module and underground on-line corrosion monitoring modular telecommunications number.
9. a kind of cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring method, which comprises the steps of:
Step 1: configuration ground cathodic protection monitoring and on-line corrosion monitoring module
Step 2: installation downhole corrosion on-line checking module and underground cathodic protection module
It is 73mm that the cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring device, which are connected to outer diameter, and length is 800mm pipe
Between tube pump (3) in column and gas anchor (5), in the pipe that the cathodic protection of pipe string of oil-water well underground and on-line corrosion monitoring device are housed
Column side is made a call to the hole Ф 8mmm and is sealed with sealant, and sensor is passed through electrostatic in resistance probe sensor insertion hole
It bridges conducting wire and pipe string of oil-water well ontology is grounded；
Step 3: downhole corrosion on-line checking module and cathodic protection modular debugging are carried out
It after the completion of step 2, is powered, then carries out underground cathodic protection module and on-line corrosion monitoring modular debugging, underground yin
Pole protective module and on-line corrosion monitoring module upload to cathodic protection voltage value, current values and etch rate data
Ground cathodic protection monitoring and on-line corrosion monitoring module, are analyzed and processed and show；
Step 4: ground cathodic protection monitoring and on-line corrosion monitoring module inspection
Open ground cathodic protection monitoring and on-line corrosion monitoring module, the tubing string underground cathodic protection electricity that receiving step three transmits
Pressure, electric current and etch rate data carry out the data of receiving by ground cathodic protection monitoring and on-line corrosion monitoring module
Corrosion rate and corrosion condition calculate, and are analyzed, handled according to the position data of acquisition, to judge the old of tube corrosion layer
Change state.
10. a kind of pipe string of oil-water well underground cathodic protection as claimed in claim 9 and on-line corrosion monitoring method, feature exist
It is calculated in: pipe string of oil-water well corrosion rate in the step four and corrosion depth and old to pipe string of oil-water well downhole corrosion layer
Changing positioning is to obtain with the following method；
According to the situation of resistance probe sensor, pipe string of oil-water well corrosion rate is calculated using following formula:
Metal testing plate corrosion depth H in resistance probe sensor are as follows:
H=r0*{1.0-[1.0-(Rt-Ro)/Rt]1/2,
In formula: r0It is metal testing plate original radius；
R0To corrode preceding resistance value；
RtFor resistance value after corrosion；
Metal testing plate rate of corrosion calculation formula:
V=8760* (H2-H1)/(T2-T1)
In formula: T2-T1For time of measuring interval twice,
H2-H1Difference for the corrosion depth measured twice,
Metal testing plate rate of corrosion is pipe string of oil-water well corrosion rate；
The pipe string of oil-water well corrosion layer is located through following method and obtains:
Pipe string of oil-water well average thickness: Tt=(B1T1-B2T2)/Bt
Wherein: TtTubing string average thickness；
BtAverage magnetic induction intensity in tubing string；
T1Corrode head pipe post thickness；
B1Average magnetic induction intensity before corroding；
T2Tubing string thickness after corrosion；
B1Average magnetic induction intensity after corrosion；
When tubing string average thickness and former tubing string thickness difference are less than 1/10, it is judged as that pipe string of oil-water well corrosion is not serious, works as tubing string
Average thickness and former tubing string thickness difference 1/5~1/10, are judged as pipe string of oil-water well serious corrosion；When tubing string average thickness
It is greater than 1/5 with former tubing string thickness difference, is judged as that pipe string of oil-water well corrosion is extremely serious.
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| CN114556012A (en) * | 2019-10-17 | 2022-05-27 | 奇秉镐 | Multifunctional corrosion detection system |
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