CN108562619A - Detection device and detection method for coating quality in underground casing - Google Patents
Detection device and detection method for coating quality in underground casing Download PDFInfo
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- CN108562619A CN108562619A CN201810266483.8A CN201810266483A CN108562619A CN 108562619 A CN108562619 A CN 108562619A CN 201810266483 A CN201810266483 A CN 201810266483A CN 108562619 A CN108562619 A CN 108562619A
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- 238000000576 coating method Methods 0.000 title claims abstract description 147
- 239000011248 coating agent Substances 0.000 title claims abstract description 145
- 238000001514 detection method Methods 0.000 title claims abstract description 47
- 239000003792 electrolyte Substances 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000009413 insulation Methods 0.000 claims description 37
- 230000005611 electricity Effects 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 14
- 238000013441 quality evaluation Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 6
- 239000003129 oil well Substances 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 229920001617 Vinyon Polymers 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 239000008398 formation water Substances 0.000 claims description 3
- 239000013505 freshwater Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims 1
- 238000010292 electrical insulation Methods 0.000 abstract 1
- 230000000452 restraining effect Effects 0.000 abstract 1
- 238000005406 washing Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000010422 painting Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000013632 homeostatic process Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229920003986 novolac Polymers 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
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Abstract
The invention belongs to the technical field of anticorrosive coating detection, and particularly relates to a device and a method for detecting the coating quality in an underground casing, which are used for drifting and well washing of a target well casing, wherein the casing is filled with electrolyte; connecting the instrument string, lowering it into the bottom of well, lifting it up, applying same-polarity voltage to main electrode, upper and lower auxiliary electrodes, which are connected in short circuit and have equal potential UBThe detector automatically adjusts the output current I of the upper auxiliary electrode and the lower auxiliary electrode to the stratum loopB1、IB2Make UBEqual to the main electrode potential UAWhile detecting the voltage U of the main electrodeAAnd current IAThe resistance of the coating in the sleeve is calculated according to ohm's lawAnd according to the characteristic that the resistance reflects the quality performance of the coating, which is an index for measuring the electrical insulation property of the inner coating, the quality of the inner coating of the underground casing is judged by detecting the resistance of the coating. The invention achieves the purposes of restraining the trend of the main current and detecting the coating quality in the underground casing according to the potential balance principle, and has the advantages of easy operation and low detection cost.
Description
Technical field
The invention belongs to corrosion-inhibiting coating detection technique fields, and in particular to a kind of down-hole casing inner coating quality detection device
And detection method.
Background technology
Domestic and international oil field generally extends oil jacket tube lifetime using organic inner coating protection technology.The organic inner coating raw material of casing
The predominantly organic coatings such as epoxy resin or epoxy novolac form dense coating, and thickness by room temperature, hot setting in inner wall
It is relatively thin, about 100~600 μm.Oil well casing is gone into the well before completion, ground can by visual observation, endoscope and leak source, Insulation monitoring
The modes such as instrument determine that internally coated quality, ripe effective method have low pressure leak detecting, online electric spark leak detecting etc..Casing exists
Hundreds of meters to thousands of meters of underground depth, pit shaft is interior, and there is also the complex dielectrics such as completion fluid, oil gas water, have certain temperature and pressure
Power will judge and detect the set inner tube coating quality of underground state there are great difficulties.
For sleeve body internal corrosion, damage and it is run-down the problems such as engineering log technology it is numerous, formed serial opposite
Ripe logging method and extensive use in industry mainly have underground multi-arm caliper, based on magnetic survey thickness and well temperature, optics
The types such as television imaging and ultrasonic imaging, but these are based on electromagnetism, mechanical hole diameter, temperature field, optics and ultrasonic wave principle
Logging method is difficult to detect the organic coating thickness or damage status that thickness is only the up to a hundred microns of orders of magnitude.
For the on-line checking of down-hole casing inner coating quality, applies for a patent 201510621431.4 and provide a kind of underground
The internally coated single electrode current type detection method of tubing and casing, the patent use positive electrode Injection Current in down-hole casing,
Positive electrode is away from oil jacket inside pipe wall apart from necessary<0.04m applies for a patent 201510621495.4 and provides in a kind of tube and casing in downhole
Three electrode potential differential detection methods of coating, the patent are electrode Injection Currents in down-hole casing, while using another 2
Branch electrode detection potential difference therefrom picks up coating quality signal, and the characteristics of this two pieces patent is to acquire in tubing and casing in advance
Current value (or potential difference) under different conductivity medias, different damaged rate forms data group, is drawn in tubing and casing according to data group
Coating oil jacket inner tube coating breakage rate-electric current (or potential difference) curve graph template under same electrolytic conductivity, is then surveyed,
The breakage rate of coating is obtained according to template, and complicated in program, operation is relatively professional.
Invention content
The purpose of the present invention is overcome to need to consider that casing electrolyte inside salinity factor causes to detect journey in the prior art
The problem of sequence is complicated, positive electrode must abut internal surface of sleeve pipe.
For this purpose, the present invention provides a kind of down-hole casing inner coating quality detection device, including casing, casing are located at well
Under, internal surface of sleeve pipe is coated with inner coating, the down-hole casing inner coating quality detection device further include logging truck, laptop,
Crane, circuit grounding electrode, cable, head harness, detector, magnetic locator, weighted lever and centralizer set well logging system in logging truck
System, centralizer, weighted lever, magnetic locator, detector and head harness pass sequentially through cable connection in casing from bottom to top, horse cage
Head, crane and logging truck passes sequentially through cable connection and crane and logging truck are respectively positioned on ground, laptop connection are surveyed
Well system, the power cathode link circuit grounding electrode of detector.
The detector includes that top connection, upper supplementary insulation ring, upper auxiliary electrode, upper major insulation ring, main electrode, lower master are exhausted
Edge ring, lower auxiliary electrode, lower supplementary insulation ring, mechanical hull, pipe inner frame circuit board and lower contact, top connection, upper auxiliary are exhausted
Edge ring, upper auxiliary electrode, upper major insulation ring, main electrode, lower major insulation ring, lower auxiliary electrode, lower supplementary insulation ring, mechanical hull
Be sequentially connected from the top down with lower contact, mechanical hull interconnecting tube inner frame circuit board, upper auxiliary electrode, main electrode and under
For auxiliary electrode by cable connection tube inner frame circuit board, top connection connects head harness, and lower contact connects magnetic locator.
The centralizer uses rolling wheel centralizer.
The cable uses the standard seven core cable of oil well logging.
The upper auxiliary electrode, main electrode and lower auxiliary electrode use stainless steel steel loop, upper supplementary insulation ring, upper major insulation
Ring, lower major insulation ring and lower supplementary insulation ring use vinyon material, pipe inner frame circuit board include at least amplifying circuit,
Acquisition Circuit and power supply, amplifying circuit use instrument amplifier AD620, Acquisition Circuit to use ADS1274 analog-digital converters, power supply
Using switching power supply.
A kind of monitoring method of down-hole casing inner coating quality detection device, includes the following steps：
1) casing drifting and well-flushing are carried out successively to target well, it is ensured that casing is unobstructed, then replaces former target with electrolyte
Liquid in well will fill electrolyte to well head until the entrance liquid water quality of target well detection unanimously stops replacing in casing；
2) instrument string is connected：Centralizer, weighted lever, magnetic locator, detector and head harness pass sequentially through electricity from bottom to top
Cable is connected in the casing for filling electrolyte in step 1), and head harness, crane and logging truck pass sequentially through cable connection and crane
It is respectively positioned on ground with logging truck, laptop connects logging system, the power cathode link circuit ground connection electricity of detector
Pole；
3) detection of two class situations is completed：
One kind is detected in the cased well of intact coating：In the set of the cased well of intact coating first as described in step 1)
Electrolyte is full of in pipe, then such as step 2) the connection instrument string, by the instrument string connected down toward the cased well of intact coating
Bottom above carries instrument string later, it is upper carry instrument string during start to detect, magnetic locator acquires well depth data, and detector adopts
The current potential and current data for collecting main electrode are calculated according to Ohm's law and potential balance principle in the cased well of intact coating
The well depth data of acquisition and resistance data are plotted as well depth-resistance data curve, take electricity by the internally coated resistance data of casing
Hinder normal data of the maximum value of data as intact coating；
Two classes are detected in uncoated cased well：It is filled in the casing of uncoated cased well first as described in step 1)
Expire electrolyte, then such as step 2) the connection instrument string, by the instrument string connected down toward uncoated cased well bottom, Zhi Houshang
Carry instrument string, it is upper carry instrument string during start to detect, magnetic locator acquires well depth data, and detector acquires main electrode
The resistance data in uncoated cased well is calculated according to Ohm's law and potential balance principle in current potential and current data,
The well depth data of acquisition and resistance data are plotted as well depth-resistance data curve, the resistance data of acquisition is as casing without painting
Normal data under exposed i.e. 100% damaged condition of coating of layer；
4) the set inner tube coating of target well is detected：Electrolyte is full of in the casing of target well first as described in step 1),
Then such as step 2) the connection instrument string above carries instrument string later by the instrument string connected down toward the shaft bottom of target well, upper
Start to detect during carrying instrument string, magnetic locator acquires well depth data, and detector acquires the current potential and electric current number of main electrode
According to the internally coated resistance data of casing of target well being calculated according to Ohm's law and potential balance principle, by the well of acquisition
Deep data and resistance data are plotted as well depth-resistance data curve；
5) data of step 3) and step 4) are handled using two ways and draws casing coating quality evaluation figure：
Mode one：Successively by the resistance data in the cased well of resistance data and intact coating in uncoated cased well
As abscissa zero line benchmark and full scale line benchmark, using well depth as ordinate, object to be measured well coating resistance data are made
For abscissa, casing well depth-inner coating quality evaluation figure is drawn；
Mode two：Using the resistance data in the cased well of intact coating as benchmark, by object to be measured well coating resistance number
According to the ratio of the normal data with intact coating as the intact degree index of coating, use 1- ratios as coating damage degree, with well
Depth is ordinate, is made with the ratio of object to be measured well coating resistance data and the normal data of intact coating, coating damage degree
For abscissa, casing well depth-inner coating quality evaluation figure is drawn.
After the set inner tube coating Type Change of the target well, repeats step 3) and well depth-resistance is done to the coating after change
Data and curves, and obtain the measuring resistance data of the intact coating after change.
The step 1), step 3) be identical with the electrolyte described in step 4) and the conductivity of electrolyte is kept constant, electricity
The conductivity value for solving liquid is more than the salinity of ground fresh water and is less than formation water salinity.
Beneficial effects of the present invention：This down-hole casing inner coating quality detection device provided by the invention and detection side
Method has electrolyte conducting medium in oil-water well, according to potential balance principle, auxiliary electrode, lower auxiliary electricity in realization
Extremely the control of main electrode electric current is flowed to, then the current potential and supply current of the main electrode of acquisition reflection casing coating quality information
Parameter is realized to the on-line checking of down-hole casing inner coating quality, solves the set inner tube coating quality evaluation one of in-service oil-water well
As need processing electrolytic conductivity factor to lead to the problem of program is relative complex, measuring electrode need to abut internal surface of sleeve pipe, well logging behaviour
Make simple and convenient, technically reliable, grasps inner coating anti-corrosion effect, optimization set inner tube coating design for tracking and carry out casing and be on active service
Life prediction assessment etc. provides foundation and technological means.
Description of the drawings
The present invention is described in further details below with reference to attached drawing.
Fig. 1 is the detection method principle schematic of down-hole casing inner coating quality detection device；
Fig. 2 is potential balance equivalent circuit diagram；
Fig. 3 is the structure connection diagram of down-hole casing inner coating quality detection device；
Fig. 4 is the structural schematic diagram of detector；
Fig. 5 is potential balance closed-loop control schematic diagram.
Reference sign：1.1, casing；1.2, upper auxiliary electrode active region；1.3, main electrode active region；1.4, main electricity
Electrode current；1.5, lower auxiliary electrode active region；1.6, inner coating；1.7, casing electrolyte inside；1.8, lower auxiliary electrode electric current；
1.9, lower auxiliary electrode；1.10, lower major insulation ring；1.11, main electrode；1.12, upper major insulation ring；1.13, upper auxiliary electrode；
1.14, cable；1.15, upper auxiliary electrode electric current；1.16, casing current；1-1.1, well liquid and casing resistance；1-1.2, circuit connects
Ground electrode；1-1.3, coating resistance；1-1.4, main electrode end well liquid radial direction resistance；1-1.5, main electrode end；1-1.6, auxiliary electricity
Extremely；1-1.7, auxiliary electrode end well liquid radial direction resistance；1-1.8, galvanometer；2.1 logging truck；2.2, laptop；2.3、
Weighted lever；2.4, centralizer；2.5, magnetic locator；2.6, detector；2.7, head harness；2.8, crane；2-1.1, top connection；2-
1.2, connecting wire；2-1.3, pipe inner frame circuit board；2-1.4, lower contact；2-1.5, mechanical cover；2-1.6, lower auxiliary are exhausted
Edge ring；2-1.7, upper supplementary insulation ring；3.1, main electrode current potential；3.2, difference signal；3.3, comparison amplifier；3.4, given electricity
Position；3.5, Regulate signal；3.6, upper and lower auxiliary electrode current potential；3.7, comparator.
Specific implementation mode
Embodiment 1：
A kind of down-hole casing inner coating quality detection device, including casing 1.1, casing 1.1 are located at underground, in casing 1.1
Wall is coated with inner coating 1.6, the down-hole casing inner coating quality detection device further include logging truck 2.1, laptop 2.2,
Crane 2.8, circuit grounding electrode 1-1.2, cable 1.14, head harness 2.7, detector 2.6, magnetic locator 2.5, weighted lever 2.3
With centralizer 2.4, logging system, centralizer 2.4, weighted lever 2.3, magnetic locator 2.5,2.6 and of detector are set in logging truck 2.1
Head harness 2.7 passes sequentially through cable 1.14 and is connected in casing 1.1 from bottom to top, head harness 2.7, crane 2.8 and logging truck 2.1
It passes sequentially through the connection of cable 1.14 and crane 2.8 and logging truck 2.1 is respectively positioned on ground, the connection well logging of laptop 2.2
System, the power cathode link circuit grounding electrode 1-1.2 of detector 2.6.
Embodiment 2：
As shown in figure 3, a kind of down-hole casing inner coating quality detection device, including casing 1.1, casing 1.1 are located at underground,
1.1 inner wall of casing is coated with inner coating 1.6, and the down-hole casing inner coating quality detection device further includes logging truck 2.1, notebook
Computer 2.2, circuit grounding electrode 1-1.2, cable 1.14, head harness 2.7, detector 2.6, magnetic locator 2.5, adds crane 2.8
Weight bar 2.3 and centralizer 2.4 set logging system, centralizer 2.4, weighted lever 2.3, magnetic locator 2.5, detection in logging truck 2.1
Instrument 2.6 and head harness 2.7 pass sequentially through cable 1.14 and are connected in casing 1.1 from bottom to top, head harness 2.7, crane 2.8 and survey
Well vehicle 2.1 passes sequentially through the connection of cable 1.14 and crane 2.8 and logging truck 2.1 are respectively positioned on ground, and laptop 2.2 connects
Meet logging system, the power cathode link circuit grounding electrode 1-1.2 of detector 2.6.
Wherein centralizer 2.4 plays between two parties instrument string, and weighted lever 2.3, which ensures smoothly to rise, goes into the well, and magnetic locator 2.5 is examined
Casing coupling is surveyed, position coating depth measurement is used for, head harness 2.7 plays connector conversion and test safety effect.There is electricity in oil-water well
In the case of solving liquid conducting medium, according to potential balance principle, auxiliary electrode 1.13, lower auxiliary electrode 1.9 are to main electrode in realization
The control of electric current 1.4 flows to, then the current potential of the main electrode 1.11 of acquisition reflection casing coating quality information and supply current ginseng
Number realizes that the on-line checking to down-hole casing inner coating quality, the set inner tube coating quality evaluation for solving in-service oil-water well are general
Electrolytic conductivity factor, which need to be handled, leads to the problem of program is relative complex, measuring electrode need to abut internal surface of sleeve pipe, logging operation
Simple and convenient, technically reliable grasps inner coating anti-corrosion effect, optimization set inner tube coating design and carries out casing and is on active service the longevity for tracking
It orders forecast assessment etc. and foundation and technological means is provided.
Embodiment 3
As shown in figure 4, on the basis of embodiment 2, the detector 2.6 includes top connection 2-1.1, upper supplementary insulation ring
2-1.7, upper auxiliary electrode 1.13, upper major insulation ring 1.12, main electrode 1.11, lower major insulation ring 1.10, lower auxiliary electrode 1.9,
Lower supplementary insulation ring 2-1.6, mechanical hull 2-1.5, pipe inner frame circuit board 2-1.3 and lower contact 2-1.4, top connection 2-1.1,
Upper supplementary insulation ring 2-1.7, upper auxiliary electrode 1.13, upper major insulation ring 1.12, main electrode 1.11, lower major insulation ring 1.10, under
Auxiliary electrode 1.9, lower supplementary insulation ring 2-1.6, mechanical hull 2-1.5 and lower contact 2-1.4 are sequentially connected from the top down, machinery
Shell 2-1.5 interconnecting tube inner frame circuit board 2-1.3, upper auxiliary electrode 1.13, main electrode 1.11 and lower auxiliary electrode 1.9
Pass through 1.14 connecting tube inner frame circuit board 2-1.3 of cable, top connection 2-1.1 connections head harness 2.7, lower contact 2-1.4 companies
Connect magnetic locator 2.5.
The centralizer 2.4 uses rolling wheel centralizer.When rolling wheel centralizer is sleeved on casing downslide, idler wheel can rotate, more
Facilitate the decentralization of centralizer and above carry, reduces frictional force.
The cable 1.14 uses the standard seven core cable of oil well logging.Logging system in logging truck 2.1 uses
SKD3000 numerical controlled well logging systems；Laptop 2.2, circuit earthing pole 1-1.2, weighted lever 2.3, centralizer 2.4, magnetic
Locator 2.5, head harness 2.7, crane 2.8 and logging truck 2.1 use commercial product；Ensure that detection device reaches standard and use
Safety.
The upper auxiliary electrode 1.13, main electrode 1.11 and lower auxiliary electrode 1.9 use stainless steel steel loop, upper supplementary insulation
Ring 2-1.7, upper major insulation ring 1.12, lower major insulation ring 1.10 and lower supplementary insulation ring 2-1.6 use vinyon material, pipe
Inner frame circuit board 2-1.3 includes at least amplifying circuit, Acquisition Circuit and power supply, and amplifying circuit uses instrument amplifier AD620,
Acquisition Circuit uses ADS1274 analog-digital converters, power supply to use switching power supply.Its remaining part of pipe inner frame circuit board 2-1.3
Divide and is completed using conventional circuit design.
The software section for completing 1.6 detection of down-hole casing inner coating mainly includes the acquisition of well depth, electric current, three parameter of voltage
Storage processing and Communication Control, well depth data are completed by SKD3000 numerical controlled well logging systems, with SKD3000 Sub-system in Computerized Logging System
Plane system is platform, carries out appropriate simple system extension on this basis, increases SKD3000 numerical controlled well logging systems and pen
Remember the functions such as the communication, Current Voltage operation, mapping and printing of this computer 2.2, belongs to known technology.
The operation principle of the present invention is that：
The detection method principle schematic of down-hole casing inner coating quality detection device referring to Fig.1, ground power supply give main electricity
Lowest impedance path rule " is walked " according to electric current, under normal circumstances main electrode electric current for positive main electrode electric current 1.4 in pole 1.11
1.4 will dissipate and gather back ground return grounding electrode 1-1.2 around, and mainly well liquid flows back along casing, and flows through casing to be measured
The magnitude of current in 1.6 face of inner coating is accordingly smaller.In order to make main electrode electric current 1.4 mainly by coat side to be measured, devise to upper
Auxiliary electrode 1.13 and lower auxiliary electrode 1.9 are for same polarity electric current, auxiliary electrode electric current 1.15 and lower auxiliary electrode electricity in adjusting
Stream 1.8 makes the electrode potential 3.6 of auxiliary electrode 1.13 and lower auxiliary electrode 1.9 be equal to main electrode current potential 3.1, upper auxiliary electricity
Finally confluence is returned in the complete tube current of sleeve 1.16 for electrode current 1.15, lower auxiliary electrode electric current 1.8 and main electrode electric current 1.4
Power cathode, that is, circuit earthing pole 1-1.2.According to potential balance principle, upper auxiliary electrode electric current 1.15 will be in upper auxiliary electrode diameter
It flows to form upper auxiliary current active region 1.2 to the area of coverage, lower auxiliary electrode electric current 1.8 will be acted in the lower auxiliary electrode of diagram
Area 1.5 is flowed, and main electrode and the potential difference in upper and lower auxiliary electrode effect section are zero or negative value, lead to main electrode electric current 1.10
It mainly will flow to form main electrode active region 1.3 in the radial area of coverage, the result is that upper auxiliary electrode 1.13 and lower auxiliary electrode 1.9
The electric field region constraint main electrode electric current 1.4 of generation flows to form main electrode active region 1.3 in the main electrode radial direction area of coverage, main electricity
The coating quality of pole active region 1.3 will be by 3.1 ratio of main electrode electric current 1.4 and main electrode current potentialIt determines.
With reference to Fig. 2 potential balance equivalent circuit diagrams, further illustrate main electrode 1.11 and upper auxiliary electrode 1.13 and under it is auxiliary
Electrode 1.9 is helped to constrain the action principle of principal current flow direction by potential balance；In Fig. 2, DC power supply is to main electrode 1.11, upper auxiliary
The electrical circuit that electrode 1.13 and the power supply of lower auxiliary electrode 1.9 generate is helped to be equivalent to two resistance circuits, two circuit common returns
Electrode 1-1.2, ground electrode are also zero potential datum mark, and wherein well liquid and casing resistance are homeostasis amounts, and coating resistance 1-1.3 is with painting
Layer mass change and change, UB、UAMain electrode 1.11 can be respectively seen as in 1.13 He of main electrode active region 1.3 and upper auxiliary electrode
The current potential of arbitrary point in the auxiliary electrode active region of lower auxiliary electrode 1.9, in order to make main electrode electric current 1.4, (its value is IIt is main) only flow
Enter main electrode active region 1.3, adjusts IIt is auxiliary, make UB≈UA, galvanometer 1-1.8 no currents flow through, when usual coating quality is preferable, because
Coating resistance 1-1.3 is more much bigger than well liquid and casing resistance, it is desirable that reduces main electrode electric current 1.4, that is, reduces main electrode current potential
3.1, to control auxiliary electrode electric current IIt is auxiliaryNo more than 1.14 cable core maximum current capacity of cable (<10A).
With reference to Fig. 5 potential balance closed-loop control schematic diagrames, main electrode current potential 3.1 is compared with upper and lower auxiliary electrode current potential 3.6
Generate difference signal 3.2, difference signal 3.2 and Setting signal 3.4 are sent into comparator 3.7, if main electrode current potential 3.1 higher than it is upper,
Lower auxiliary electrode current potential 3.6 exports positive electricity potentiometer signal, when positive electricity potentiometer signal is more than Setting signal 3.4, then comparison amplifier
The upper auxiliary electrode electric current 1.15 of 3.3 output regulation signals 3.5 increase, lower auxiliary electrode electric current 1.8, to increase upper and lower auxiliary
Electrode potential 3.6；If main electrode current potential 3.1 is less than upper and lower auxiliary electrode current potential 3.6, negative electricity potentiometer signal, negative electricity potential difference are exported
When signal absolute value is more than Setting signal 3.4, then 3.3 output regulation signal 3.5 of comparison amplifier reduces upper auxiliary electrode electric current
1.15, lower auxiliary electrode electric current 1.8, to reduce upper and lower auxiliary electrode current potential 3.6；It is given if 3.2 absolute value of difference signal is less than
Determine signal, then do not change upper auxiliary electrode electric current 1.15, lower auxiliary electrode electric current 1.8, does not change upper and lower auxiliary electrode electricity accordingly
Position 3.6.By closed control circuit, automatic adjustment makes main electrode current potential 3.1 be roughly equal to upper and lower auxiliary electrode current potential 3.6.
Embodiment 4
A kind of monitoring method of down-hole casing inner coating quality detection device, which is characterized in that include the following steps：
1) casing drifting and well-flushing are carried out successively to target well, it is ensured that casing 1.1 is unobstructed, then replaces former mesh with electrolyte
Liquid in well is marked, until the entrance liquid water quality of target well detection unanimously stops replacing, electrolyte will be filled extremely in casing 1.1
Well head；
2) instrument string is connected：Centralizer 2.4, weighted lever 2.3, magnetic locator 2.5, detector 2.6 and head harness 2.7 are under
It passes sequentially through cable 1.14 upwards to be connected in the casing 1.1 for filling electrolyte in step 1), head harness 2.7, crane 2.8 and survey
Well vehicle 2.1 passes sequentially through the connection of cable 1.14 and crane 2.8 and logging truck 2.1 are respectively positioned on ground, and laptop 2.2 connects
Meet logging system, the power cathode link circuit grounding electrode 1-1.2 of detector 2.6；
3) detection of two class situations is completed：
One kind is detected in the cased well of intact coating：In the set of the cased well of intact coating first as described in step 1)
Electrolyte is full of in pipe 1.1, then such as step 2) the connection instrument string, by the instrument string connected down toward the casing of intact coating
Shaft bottom above carries instrument string later, it is upper carry instrument string during start to detect, magnetic locator 2.5 acquire well depth data, detection
Instrument 2.6 acquires the current potential and current data of main electrode 1.11, and intact painting is calculated according to Ohm's law and potential balance principle
The resistance data of the inner coating 1.6 of the cased well inner sleeve 1.1 of layer, well is plotted as by the well depth data of acquisition and resistance data
Depth-resistance data curve takes normal data of the maximum value of resistance data as intact coating；
Two classes are detected in uncoated cased well：In the casing 1.1 of uncoated cased well first as described in step 1)
It is interior to be full of electrolyte, then such as step 2) the connection instrument string, by the instrument string connected down toward uncoated cased well bottom, it
Above carry instrument string afterwards, it is upper carry instrument string during start to detect, magnetic locator 2.5 acquires well depth data, and detector 2.6 adopts
Uncoated cased well is calculated according to Ohm's law and potential balance principle in the current potential and current data for collecting main electrode 1.11
The well depth data of acquisition and resistance data are plotted as well depth-resistance data curve, the resistance data of acquisition by interior resistance data
As the normal data under uncoated exposed i.e. 100% damaged condition of coating of casing；
4) the set inner tube coating of target well is detected：Electrolyte is full of in the casing of target well first as described in step 1),
Then such as step 2) the connection instrument string above carries instrument string later by the instrument string connected down toward the shaft bottom of target well, upper
Start to detect during carrying instrument string, magnetic locator 2.5 acquires well depth data, and detector 2.6 acquires the electricity of main electrode 1.11
The resistance number of the set inner tube coating 1.6 of target well is calculated according to Ohm's law and potential balance principle for position and current data
According to the well depth data of acquisition and resistance data are plotted as well depth-resistance data curve；
5) data of step 3) and step 4) are handled using two ways and draws casing coating quality evaluation figure：
Mode one：Successively by the resistance data in the cased well of resistance data and intact coating in uncoated cased well
As abscissa zero line benchmark and full scale line benchmark, using well depth as ordinate, object to be measured well coating resistance data are made
For abscissa, casing well depth-inner coating quality evaluation figure is drawn；
Mode two：Using the resistance data in the cased well of intact coating as benchmark, by object to be measured well coating resistance number
According to the ratio of the normal data with intact coating as the intact degree index of coating, use 1- ratios as coating damage degree, with well
Depth is ordinate, is made with the ratio of object to be measured well coating resistance data and the normal data of intact coating, coating damage degree
For abscissa, casing well depth-inner coating quality evaluation figure is drawn.
After the set inner tube coating Type Change of the target well, repeats step 3) and well depth-resistance is done to the coating after change
Data and curves, and obtain the measuring resistance data of the intact coating after change.The measuring resistance of coating after certain Type Change
Data no longer need to survey the type new coating when surveying the evaluation of the type coating quality once detecting.
The step 1), step 3) be identical with the electrolyte described in step 4) and the conductivity of electrolyte is kept constant, electricity
The conductivity value for solving liquid is more than the salinity of ground fresh water and is less than formation water salinity；It is physically easier to perform in this way；Electrolyte
Conductivity occurrence is to be easy to scene allotment, less than ground layer original conductivity and meet oil well production operation as principle and determine.
This method reaches technical indicator：
Cover inner tube coating：Organic insulation paint coatings.
It is applicable in casing specification (Ф outer diameters × wall thickness)：Ф139.7mm×7.72mm.
Detector：Heatproof：- 10 DEG C~+90 DEG C, water pressure resistance：40MPa, outer diameter of popping one's head in：108mm, detector body diameter：
73mm。
Cable single maximum current：﹤ 10A, supply voltage：﹤ 30V.
Detection set pipe coating impaired area：<10cm2, coating information longitudinal resolution：<0.5m forms quantitative response coating
The log of quality information.
Detection speed：﹤ 1200m/hr.
In description of the invention, it is to be understood that if there is the orientation or positional relationship of the instructions such as term "upper", "lower" to be
It is based on the orientation or positional relationship shown in the drawings, specific side must be had by not indicating or implying the indicated device or element
Position, with specific azimuth configuration and operation, therefore the terms describing the positional relationship in the drawings are only for illustration, Bu Nengli
Solution is the limitation to this patent.
The foregoing examples are only illustrative of the present invention, does not constitute the limitation to protection scope of the present invention, all
Be with the present invention it is same or analogous design all belong to the scope of protection of the present invention within.
Claims (7)
1. a kind of down-hole casing inner coating quality detection device, including casing (1.1), casing (1.1) are located at underground, casing
(1.1) inner wall is coated with inner coating (1.6), it is characterised in that：The down-hole casing inner coating quality detection device further includes well logging
Vehicle (2.1), laptop (2.2), crane (2.8), circuit grounding electrode (1-1.2), cable (1.14), head harness (2.7),
Detector (2.6), magnetic locator (2.5), weighted lever (2.3) and centralizer (2.4), logging truck (2.1) is interior to set logging system, helps
Positive device (2.4), weighted lever (2.3), magnetic locator (2.5), detector (2.6) and head harness (2.7) pass sequentially through from bottom to top
Cable (1.14) is connected in casing (1.1), and head harness (2.7), crane (2.8) and logging truck (2.1) pass sequentially through cable
(1.14) it connecting and crane (2.8) and logging truck (2.1) is respectively positioned on ground, laptop (2.2) connects logging system,
The power cathode link circuit grounding electrode (1-1.2) of detector (2.6), the detector (2.6) includes top connection (2-
1.1), upper supplementary insulation ring (2-1.7), upper auxiliary electrode (1.13), upper major insulation ring (1.12), main electrode (1.11), lower master
Dead ring (1.10), lower auxiliary electrode (1.9), lower supplementary insulation ring (2-1.6), mechanical hull (2-1.5), pipe inner frame circuit
Plate (2-1.3) and lower contact (2-1.4), top connection (2-1.1), upper supplementary insulation ring (2-1.7), upper auxiliary electrode (1.13),
Upper major insulation ring (1.12), main electrode (1.11), lower major insulation ring (1.10), lower auxiliary electrode (1.9), lower supplementary insulation ring
(2-1.6), mechanical hull (2-1.5) and lower contact (2-1.4) are sequentially connected from the top down, are connected inside mechanical hull (2-1.5)
Take over inner frame circuit board (2-1.3), upper auxiliary electrode (1.13), main electrode (1.11) and lower auxiliary electrode (1.9) pass through
Cable (1.14) connecting tube inner frame circuit board (2-1.3), top connection (2-1.1) connect head harness (2.7), lower contact (2-
1.4) connection magnetic locator (2.5).
2. down-hole casing inner coating quality detection device as described in claim 1, it is characterised in that：The centralizer (2.4)
Using rolling wheel centralizer.
3. down-hole casing inner coating quality detection device as claimed in claim 2, it is characterised in that：The cable (1.14) is adopted
With the standard seven core cable of oil well logging.
4. down-hole casing inner coating quality detection device as claimed in claim 3, it is characterised in that：The upper auxiliary electrode
(1.13), main electrode (1.11) and lower auxiliary electrode (1.9) use stainless steel steel loop, and upper supplementary insulation ring (2-1.7), upper master are exhausted
Edge ring (1.12), lower major insulation ring (1.10) and lower supplementary insulation ring (2-1.6) use vinyon material, pipe inner frame electricity
Road plate (2-1.3) includes at least amplifying circuit, Acquisition Circuit and power supply, and amplifying circuit uses instrument amplifier AD620, acquisition electricity
Road uses ADS1274 analog-digital converters, power supply to use switching power supply.
5. a kind of monitoring method of down-hole casing inner coating quality detection device, which is characterized in that include the following steps：
1) casing drifting and well-flushing are carried out successively to target well, it is ensured that casing (1.1) is unobstructed, then replaces former target with electrolyte
Liquid in well will fill electrolyte extremely until the entrance liquid water quality of target well detection unanimously stops replacing in casing (1.1)
Well head；
2) instrument string is connected：Centralizer (2.4), weighted lever (2.3), magnetic locator (2.5), detector (2.6) and head harness
(2.7) it passes sequentially through cable (1.14) from bottom to top to be connected in the casing (1.1) for filling electrolyte in step 1), head harness
(2.7), crane (2.8) and logging truck (2.1) pass sequentially through cable (1.14) connection and crane (2.8) and logging truck (2.1) are equal
On ground, laptop (2.2) connects logging system, the power cathode link circuit ground connection electricity of detector (2.6)
Pole (1-1.2)；
3) detection of two class situations is completed：
One kind is detected in the cased well of intact coating：In the casing of the cased well of intact coating first as described in step 1)
(1.1) electrolyte is full of in, then such as step 2) the connection instrument string, by the instrument string connected down toward the casing of intact coating
Shaft bottom above carries instrument string later, it is upper carry instrument string during start to detect, magnetic locator (2.5) acquire well depth data, inspection
Current potential and current data that instrument (2.6) acquires main electrode (1.11) are surveyed, is calculated according to Ohm's law and potential balance principle
The resistance data of the inner coating (1.6) of the cased well inner sleeve (1.1) of intact coating, by the well depth data and resistance data of acquisition
It is plotted as well depth-resistance data curve, takes normal data of the maximum value of resistance data as intact coating；
Two classes are detected in uncoated cased well：First as described in step 1) in the casing (1.1) of uncoated cased well
Full of electrolyte, then such as step 2) the connection instrument string, by the instrument string connected down toward uncoated cased well bottom, later
Above carry instrument string, it is upper carry instrument string during start to detect, magnetic locator (2.5) acquire well depth data, detector (2.6)
Uncoated set is calculated according to Ohm's law and potential balance principle in the current potential and current data for acquiring main electrode (1.11)
The well depth data of acquisition and resistance data are plotted as well depth-resistance data curve, the resistance of acquisition by the resistance data in pipe well
Data are as the normal data under uncoated exposed i.e. 100% damaged condition of coating of casing；
4) the set inner tube coating of target well is detected：Electrolyte is full of in the casing of target well first as described in step 1), then
The connection instrument string as described in step 2) above carries instrument string later by the instrument string connected down toward the shaft bottom of target well, and instrument is carried upper
Start to detect during device string, magnetic locator (2.5) acquires well depth data, and detector (2.6) acquires main electrode (1.11)
The electricity of the set inner tube coating (1.6) of target well is calculated according to Ohm's law and potential balance principle for current potential and current data
Data are hindered, the well depth data of acquisition and resistance data are plotted as well depth-resistance data curve；
5) data of step 3) and step 4) are handled using two ways and draws casing coating quality evaluation figure：
Mode one：By the resistance data conduct successively in the cased well of resistance data and intact coating in uncoated cased well
Abscissa zero line benchmark and full scale line benchmark, using well depth as ordinate, using object to be measured well coating resistance data as cross
Coordinate draws casing well depth-inner coating quality evaluation figure；
Mode two：Using the resistance data in the cased well of intact coating as benchmark, by object to be measured well coating resistance data with
The ratio of the normal data of intact coating uses 1- ratios as coating damage degree, is with well depth as the intact degree index of coating
Ordinate, using the ratio of object to be measured well coating resistance data and the normal data of intact coating, coating damage degree as horizontal
Coordinate draws casing well depth-inner coating quality evaluation figure.
6. the monitoring method of down-hole casing inner coating quality detection device as claimed in claim 5, it is characterised in that：The mesh
After the set inner tube coating Type Change for marking well, repeats step 3) and well depth-resistance data curve is done to the coating after change, and obtain
The measuring resistance data of intact coating after change.
7. the monitoring method of down-hole casing inner coating quality detection device as claimed in claim 6, it is characterised in that：The step
It is rapid 1), step 3) is identical with the electrolyte described in step 4) and the conductivity of electrolyte is kept constant, the conductivity value of electrolyte
More than ground fresh water salinity and be less than formation water salinity.
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| CN113417627A (en) * | 2021-07-09 | 2021-09-21 | 中国石油天然气股份有限公司 | Method for measuring quality of outer coating of oil field casing pipe |
| CN113417626A (en) * | 2021-07-09 | 2021-09-21 | 中国石油天然气股份有限公司 | Wellhead excitation type detection method for oil field shallow well casing pipe external coating defects |
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| CN113417626B (en) * | 2021-07-09 | 2023-10-31 | 中国石油天然气股份有限公司 | Wellhead excitation type detection method for outer coating defects of oil field shallow well casing |
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