CN103111446B - Method for handling inner scaling problem of offshore production platform pipeline device - Google Patents
Method for handling inner scaling problem of offshore production platform pipeline device Download PDFInfo
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Landscapes
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a method for handling an inner scaling problem of an offshore production platform pipeline device. The method for handling the inner scaling problem of the offshore production platform pipeline device comprises scale inhibition by a chemical method, scale removal by an electrochemical method and monitoring by a physical method. The method for handling the inner scaling problem of the offshore production platform pipeline device methodically handles the scaling problem of the offshore production platform pipeline device in a thought of scale inhibition, scale removal and scale monitoring, organically combines antisepsis and scaling removal into one by using the electrochemical method, overcomes the defect that scale inhibitor can not effectively decrease thickness of formed scale layers, avoids pipeline corrosion caused by acid cleaning and production delay due to acid cleaning and pipe replacing, and reduces manpower expenses; meanwhile, the method for handling the inner scaling problem of the offshore production platform pipeline device monitors scaling effect and water quality scaling trend by using the physical method, and excellently solves the problems that construction period is long and cleaning efficiency is low in an existing method for handling the inner scaling problem of the offshore production platform pipeline device. Besides, the method for handling the inner scaling problem of the offshore production platform pipeline device is convenient to operate, outstanding in using effect, and has excellent application value.
Description
Technical field
The invention belongs to technical field of petroleum extraction, particularly relate to a kind of processing method of offshore production platform line equipment internal incrustation problem.
Background technology
When current offshore production platform carries out fouling process, usually adopt simple interpolation antisludging agent or carry out the traditional means such as pickling replace tubes, Partial flats adopts mechanical descaling's means, and current existing means, more or less all come with some shortcomings part.In traditional scale removal mode, the most widely used means are pickling, and line equipment is mainly stopped work by the process of pickling, and inject acid fluid dissolves dirt layer, pickle main component is hydrochloric acid, concentration about about 10%, and its primary chemical reflection equation is:
CaCO3+2HCl=CaCl2+H2O+CO2↑
MgCO3+2HCl=MgCl2+H2O+CO2↑
FeS+2HCl=FeCl2+H2S↑
Pickling descaling comparatively speaking cost is lower, easy and simple to handle, but meanwhile, the fouling position effect that pickling effects on surface sedimentation layer is thicker is poor, and remaining acid solution easily pollutes, it is only reduce dirty layer thickness to the control of fouling, do not solve from the dirty layer origin cause of formation, so need regularly to carry out pickling in pipeline useful life, relatively labor intensive, and use pickling descaling, after dirty layer thickness reduces, easy generation underdeposit corrosion perforation, electrochemical method is adopted to carry out scale removal in the present invention, thoroughly avoid the operation of pipeline pickling on platform, not only can enhance productivity, the conduit wiring piercing because pickling causes can also be avoided, substantially increase the security of production, adding antisludging agent is also that one of scale inhibition means commonly used by platform, its mechanism has following 4 points usually:
1. peptizaiton
Low-molecular-weight polymer, generally there is higher electrical travelling density, interionic repulsion can be produced, copolymer also has the characteristic of surfactant, they are surrounded colloidal solid to walk with water-band in stable state in the solution, the core of colloidal solid also comprises the crystal such as CaSO4 and CaCO3, therefore plays anti-scaling action
2. chelating and complexing
Scale preventative becomes the metal ion (cation) that can produce precipitation into chelating ion or the complex ion of solubility, thus suppress cation (as Ca2+, Mg2+, Ba2+) and anion (CO32-, SO42-) to combine generation precipitation, typically there is ATMP and EDTA
3. flocculation
Be suspended in water alumen ustum formed by the chain being adsorbed on high molecular polymer in water containing the colloidal solid of CaCO3 and CaSO4 nucleus, play scale effect, typically have poly amic acid and Sodium Polyacrylate,
4. distortion of lattice effect
In the process forming crystal dirt, there is high molecular polymer to enter crystal structure, destroy crystal and normally increase, and crystal is distorted, change original regular texture, make crystal no longer continue to increase, thus prevent or alleviate fouling.Simple interpolation antisludging agent carries out scale removal, often be difficult to reach good effect, reason have following some: one, antisludging agent adding proportion and dosage need to carry out determining to adjust according to field working conditions, this cycle is longer, when field working conditions changes, antisludging agent often easily lost efficacy, at this moment just need to redefine adding proportion and consumption, good scale inhibition effect cannot be played in the process, they are two years old, the effect of antisludging agent is tended to reduce inner dirty layer and is formed trend, extend the induction period of scaling time, scale problems cannot be suppressed from root, and along with time cumulation, after dirty layer is shaping gradually, cannot effectively reduce dirty layer thickness, scale inhibition result is caused to be had a greatly reduced quality, simultaneously, while interpolation antisludging agent, also to consider whether it exists with conventional corrosion inhibiter conflict, if it is improper to choose, not only can not reach desirable effect, likely accelerate the erosion and encrustation problem of pipeline on the contrary, and although conventional corrosion inhibiting and descaling agent such as EDTMPS can reach the effect of slowing down corrosion and scale inhibition simultaneously, but mainly for calcium sulfate, barium sulfate scale, and offshore platform fouling is mainly calcium carbonate scale, be difficult to reach good effect.Electrochemical method is utilized effectively to reduce molded dirty layer thickness, thus avoid the problem that antisludging agent efficiency declines, simultaneously, the existence of antisludging agent also produces facilitation effect to electrochemical means scale removal efficiency, and initiative inhibition anode loss protection means are combined with scale removal means, the object slowing down line equipment corrosion can be reached while scale removal, instead of the means of carrying out inhibition by adding corrosion inhibiter, thus avoid because conventional corrosion inhibiter to conflict with antisludging agent composition the erosion and encrustation situation penalty issue caused, mechanical descaling's mode that Partial flats adopts mainly utilizes powerful wiper, there is magnetic pipeline cleaner, nail wheel wiper and brush wheel wiper etc., wiper scale removal has easy and simple to handle compared with other scale removal mode, price is low, short construction period, workmen is few, construction equipment is simple, intensity is low, the feature such as pollution-free, but wiper is rectilinear motion, clean out dirty layer in pipe, general need 5 ~ 6 times, sometimes reach 10 times, pigging efficiency is low, of poor quality, simultaneously when line equipment internal structure complexity has turning, wiper cannot normal operation, and, when carrying out mechanical descaling, easily damage and cut are in various degree caused to line equipment inside, corrosion easily increases the weight of in damage and cut appearance place development.
Visible, often kind of descaling method all has its inevitable defect, when descaling method chosen by platform, often choose single method or appoint several method to mix at random, effectively different scale inhibition means can not be combined, make up mutually and maximize favourable factors and minimize unfavourable ones, so be difficult to the treatment effect reaching expectation, simultaneously, inappropriate scale inhibition means also can cause certain damage to line equipment, so, there is no now a kind of rationally effective method that offshore production platform calcium carbonate scaling problem is dealt with.
Utility model content
The object of the invention is to the processing method utilizing a kind of offshore production platform line equipment internal incrustation problem, be intended to solve existing often kind of descaling method and all have its inevitable defect, when descaling method chosen by platform, often choose single method or appoint several method to mix at random, effectively different scale inhibition means can not be combined, make up mutually and maximize favourable factors and minimize unfavourable ones, so be difficult to the treatment effect reaching expectation, simultaneously, inappropriate scale inhibition means also can cause certain damage to line equipment, there is no now a kind of rationally effective problem to the method that offshore production platform calcium carbonate scaling problem deals with.
The object of the present invention is to provide a kind of processing method of offshore production platform line equipment internal incrustation problem, the processing method of described offshore production platform line equipment internal incrustation problem comprises: chemical method carries out scale inhibition; Electrochemical method scale removal; Physical method is monitored.
Further, the step that the processing method of described offshore production platform line equipment internal incrustation problem is concrete is:
Chemical method carries out scale inhibition: choose suitable corrosion inhibiter according to platform operating mode and water type and Scaling Formation Origin, added by the dosing mouth of equipment and pipeline, pass through peptizaiton, chelating and complexing, flocculation and distortion of lattice effect, alleviate water quality scaling tendency, extend induction period of scaling, reduce water quality fouling tendency, such as adopt with ammonium persulfate is initator, by the method for aqueous solution polymerization, synthesize the medicament of water miscible maleic anhydride/acrylic acid/2-acrylamide-2-methyl-propane sulfonic acid/inferior sodium phosphate copolymer, the Active Growth point on nucleus is first adsorbed on by co-polymer, make crystal can not in strict accordance with lattice arrangement normal growth, crystal is distorted, the crystallite of its adsorbable multiple identical charges of chain structure simultaneously, electrostatic repulsion between them can stop the mutual collision of crystallite, thus avoid the formation of megacryst, make dirty crystal more dispersed.During reaction, first add maleic anhydride, ortho phosphorous acid sodium dihydrogen and deionized water successively, dissolve under 80 degree, add acrylic acid, ammonium persulfate, 2-acrylamide-2-methyl-propane sulfonic acid subsequently successively, be heated to 100 degrees Celsius and continue 4 hours;
Electrochemical method scale removal: the use of magnesium alloy anti-corrosion, scale-inhibiting net, utilize superplastic die forging, fine-grained alloy is pulled out at 1/2nd temperature of fusing point kelvin degree, to ensure that not producing necking down causes netting twine in use surprisingly to rupture, its specification is diameter 1mm, diamond-shaped meshes, mesh size freely can adjust according to platform water quality scaling tendency, scaling tendency is large, and then mesh size is little, at netting twine side twine infall, suitably install material reed of the same race additional, ensure netting twine can with inside pipe wall good contact, net is curling according to girth cutting in pipe, be lining in pipeline, be adjacent to inwall, reed is in netting twine and tube wall is close to side, pipe end and equipment inner bending place use argon arc welding with protect anode network do not suffer damage in welding process '
Physical method is monitored: after the installation of anti-corrosion, scale-inhibiting net, line equipment is come into operation, and thoroughly do away with field working conditions determination antisludging agent interpolation consumption, simultaneously, in protected line sections and equipment two ends, bypass is set, bypass two ends are installed can the section of closing valve, bypass connecing one can open and close type casing, built-in piezoelectric quartz thin slice, on cover a slice and carry dirty plate, parallel with water body flow direction, piezoelectric quartz upper and lower surface connecting electrode, connect outside sense voltage meter, by measuring voltage change ratio, calculate that in the unit interval, dirty thing piles up quality, thus according to the dirty thing sample rate extracted in the operating mode measured, and carry dirty plate effective surface area, calculate in this unit interval, dirt thing stackeding speed (mm/a).
Further, described chemical method carries out the principle that scale inhibition utilizes distortion of lattice effect and cohesion peptizaiton.
Further, described chemical method carries out each component molar ratio of scale inhibition is maleic anhydride: acrylic acid: 2-acrylamide-2-methyl-propane sulfonic acid=19:8:1, quality is than ammonium persulfate: ortho phosphorous acid dihydro is received: total monomer=3:4:20.
Further, described magnesium alloy material selection Mg-6Al-3Zn-Mn alloy.
Further, also comprise can open and close type casing, piezoelectric quartz thin slice, sense voltage meter for the monitoring of described physical method; Settle described piezoelectric quartz in described casing, described sense voltage meter is set outside described casing.
The processing method of offshore production platform line equipment internal incrustation problem provided by the invention, according to scale inhibition, scale removal, the thinking coherent process offshore production platform equipment installation scale problems of fouling monitoring, when having occurred problem in processing procedure, also be convenient to look for one's roots fast and study carefully the very crux that problem is found in source, simultaneously, when processing platform erosion and encrustation problem in the past, corrosion and the solution of scale problems oppose often, process scale problems causes the corrosion of line equipment to increase the weight of usually unavoidably, and this method utilizes electrochemical means organically to unite two into one anticorrosion with scale removal, added merely the time limit that antisludging agent can only extend replace tubes or pickling in the past, cannot thoroughly avoid pickling or replace tubes, and this method utilizes electrochemical means to overcome shortcoming that antisludging agent effectively cannot reduce molded dirty layer thickness, thoroughly avoiding corrosion and pickling replace tubes that pickling causes pipeline to the delay of producing decreases the expenditure of manpower, meanwhile, the existence of antisludging agent also produces facilitation effect to electrochemical means scale removal efficiency, utilize physical method to monitor fouling effect and water quality scaling tendency simultaneously, be convenient to understand at any time the fouling tendency of line equipment in result, pinpoint the problems in the very first time and deal with problems, avoid owing to stopping over the problem aggravation caused, the long construction period that the processing method preferably resolving existing offshore production platform line equipment internal incrustation exists, the problem that cleaning efficiency is low, in addition, the present invention is easy to operate, result of use is obvious, there is good using value.
Accompanying drawing explanation
Fig. 1 is the realization flow figure of the processing method of the offshore production platform line equipment internal incrustation problem that the embodiment of the present invention provides.
Fig. 2 is the relation scatter diagram of induction period of scaling and Mg2+/Ca2+.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Embodiments provide a kind of processing method of offshore production platform line equipment internal incrustation problem, the processing method of this offshore production platform line equipment internal incrustation problem comprises: chemical method carries out scale inhibition; Electrochemical method scale removal; Physical method is monitored.
As a prioritization scheme of the embodiment of the present invention, the step that the processing method of offshore production platform line equipment internal incrustation problem is concrete is:
Chemical method carries out scale inhibition: choose suitable corrosion inhibiter according to platform operating mode and water type and Scaling Formation Origin, added by the dosing mouth of equipment and pipeline, pass through peptizaiton, chelating and complexing, flocculation and distortion of lattice effect, alleviate water quality scaling tendency, extend induction period of scaling, reduce water quality fouling tendency, adopting with ammonium persulfate is initator, by the method for aqueous solution polymerization, synthesize the medicament of water miscible maleic anhydride/acrylic acid/2-acrylamide-2-methyl-propane sulfonic acid/inferior sodium phosphate copolymer, the Active Growth point on nucleus is first adsorbed on by co-polymer, make crystal can not in strict accordance with lattice arrangement normal growth, crystal is distorted, the crystallite of its adsorbable multiple identical charges of chain structure simultaneously, electrostatic repulsion between them can stop the mutual collision of crystallite, thus avoid the formation of megacryst, make dirty crystal more dispersed.During reaction, first add maleic anhydride, ortho phosphorous acid sodium dihydrogen and deionized water successively, dissolve under 80 degree, add acrylic acid, ammonium persulfate, 2-acrylamide-2-methyl-propane sulfonic acid subsequently successively, be heated to 100 degrees Celsius and continue 4 hours;
Electrochemical method scale removal: the use of magnesium alloy anti-corrosion, scale-inhibiting net, utilize superplastic die forging, fine-grained alloy is pulled out at 1/2nd temperature of fusing point kelvin degree, to ensure that not producing necking down causes netting twine in use surprisingly to rupture, its specification is diameter 1mm, diamond-shaped meshes, mesh size freely can adjust according to platform water quality scaling tendency, scaling tendency is large, and then mesh size is little, at netting twine side twine infall, suitably install material reed of the same race additional, ensure netting twine can with inside pipe wall good contact, net is curling according to girth cutting in pipe, be lining in pipeline, be adjacent to inwall, reed is in netting twine and tube wall is close to side, pipe end and equipment inner bending place use argon arc welding with protect anode network do not suffer damage in welding process '
Physical method is monitored: after the installation of anti-corrosion, scale-inhibiting net, line equipment is come into operation, and thoroughly do away with field working conditions determination antisludging agent interpolation consumption, simultaneously, in protected line sections and equipment two ends, bypass is set, bypass two ends are installed can the section of closing valve, bypass connecing one can open and close type casing, built-in piezoelectric quartz thin slice, on cover a slice and carry dirty plate, parallel with water body flow direction, piezoelectric quartz upper and lower surface connecting electrode, connect outside sense voltage meter, by measuring voltage change ratio, calculate that in the unit interval, dirty thing piles up quality, thus according to the dirty thing sample rate extracted in the operating mode measured, and carry dirty plate effective surface area, calculate in this unit interval, dirt thing stackeding speed (mm/a).
As a prioritization scheme of the embodiment of the present invention, chemical method carries out the principle that scale inhibition utilizes distortion of lattice effect and cohesion peptizaiton.
As a prioritization scheme of the embodiment of the present invention, it is maleic anhydride that chemical method carries out each component molar ratio of scale inhibition: acrylic acid: 2-acrylamide-2-methyl-propane sulfonic acid=19:8:1, quality is than ammonium persulfate: ortho phosphorous acid dihydro is received: total monomer=3:4:20.
As a prioritization scheme of the embodiment of the present invention, magnesium alloy material selection Mg-6Al-3Zn-Mn alloy.
As a prioritization scheme of the embodiment of the present invention, physical method monitoring also comprises can open and close type casing, piezoelectric quartz thin slice, sense voltage meter; Settle piezoelectric quartz in casing, sense voltage meter is set outside casing.
Referring to accompanying drawing 1, the processing method of embodiment of the present invention offshore production platform line equipment internal incrustation problem is described in further detail.
As shown in Figure 1, the processing method of a kind of offshore production platform line equipment internal incrustation problem that the invention process case provides, the method comprises:
In step S101, chemical method is utilized to carry out scale inhibition;
Suitable corrosion inhibiter is chosen according to platform operating mode and water type and Scaling Formation Origin, added by the dosing mouth of equipment and pipeline, by peptizaiton, chelating and complexing, flocculation and distortion of lattice effect, alleviate water quality scaling tendency, extend induction period of scaling, reduce water quality fouling tendency.
It is initator that the platform of current recommendation Bohai Sea region mixed water injection mode water filling adopts with ammonium persulfate, by the method for aqueous solution polymerization, synthesize the medicament of water miscible maleic anhydride/acrylic acid/2-acrylamide-2-methyl-propane sulfonic acid/inferior sodium phosphate copolymer, utilize distortion of lattice effect and cohesion peptizaiton two kinds of principles, the Active Growth point on nucleus is first adsorbed on by co-polymer, make crystal can not in strict accordance with lattice arrangement normal growth, crystal is distorted, the crystallite of its adsorbable multiple identical charges of chain structure simultaneously, electrostatic repulsion between them can stop the mutual collision of crystallite, thus avoid the formation of megacryst, make dirty crystal more dispersed.
Wherein each component molar ratio is maleic anhydride: acrylic acid: 2-acrylamide-2-methyl-propane sulfonic acid=19:8:1, quality is than ammonium persulfate: ortho phosphorous acid dihydro is received: total monomer=3:4:20, during reaction, first add maleic anhydride, ortho phosphorous acid sodium dihydrogen and deionized water successively, dissolve under 80 degree, add acrylic acid, ammonium persulfate, 2-acrylamide-2-methyl-propane sulfonic acid subsequently successively, be heated to 100 degrees Celsius and continue 4 hours.
In step s 102, electrochemical method scale removal is utilized;
The use of magnesium alloy anti-corrosion, scale-inhibiting net, material selection Mg-6Al-3Zn-Mn alloy, utilize superplastic die forging, fine-grained alloy is pulled out at 1/2nd temperature of fusing point kelvin degree, to ensure that not producing necking down causes netting twine in use surprisingly to rupture, its specification is diameter 1mm, diamond-shaped meshes, mesh size freely can adjust according to platform water quality scaling tendency, scaling tendency is large, and then mesh size is little, at netting twine side twine infall, suitably install material reed of the same race additional, ensure netting twine can with inside pipe wall good contact, net is curling according to girth cutting in pipe, be lining in pipeline, be adjacent to inwall, reed is in netting twine and tube wall is close to side, argon arc welding is used not suffer damage in welding process to protect anode network at pipe end and equipment inner bending place.
In step s 103, physical method is utilized to monitor.
After the installation of anti-corrosion, scale-inhibiting net, line equipment is come into operation, and thoroughly do away with field working conditions determination antisludging agent interpolation consumption.Simultaneously, in protected line sections and equipment two ends, bypass is set, bypass two ends are installed can the section of closing valve, bypass connecing one can open and close type casing, a slice piezoelectric quartz thin slice is settled in casing, its upper and lower surface is parallel with media flow direction, a plate electrode is respectively pasted in upper and lower surface, casing is drawn with wire, the external sense voltage meter of casing, record quartz plate upper and lower surface potential difference can be measured, according in the unit interval, the variable quantity of upper surface potential difference, heap incrustation material amount is extrapolated according to quartz plate surface area, can show that in the unit interval, quartz plate surface is subject to STRESS VARIATION amount, thus according to the dirty thing sample rate extracted in the operating mode measured, calculate in this unit interval, dirt thing stackeding speed (mm/a).
Operation principle of the present invention is:
1, chemical method scale inhibition
Suitable corrosion inhibiter is chosen according to platform operating mode and water type and Scaling Formation Origin, added by the dosing mouth of equipment and pipeline, by peptizaiton, chelating and complexing, flocculation and distortion of lattice effect, alleviate water quality scaling tendency, extend induction period of scaling, reduce water quality fouling tendency.
The mode of carrying out antisludging agent selection can choose static state deposition method and Bubbling method, if the change of this platform working condition pressure is little, what calcium ion content was higher then chooses static state deposition method, if this platform working condition pressure changes greatly, takes Bubbling method.
It is initator that the platform of current recommendation Bohai Sea region mixed water injection mode water filling adopts with ammonium persulfate, by the method for aqueous solution polymerization, synthesize the medicament of water miscible maleic anhydride/acrylic acid/2-acrylamide-2-methyl-propane sulfonic acid/inferior sodium phosphate copolymer, utilize distortion of lattice effect and cohesion peptizaiton two kinds of principles, the Active Growth point on nucleus is first adsorbed on by co-polymer, make crystal can not in strict accordance with lattice arrangement normal growth, crystal is distorted, the crystallite of its adsorbable multiple identical charges of chain structure simultaneously, electrostatic repulsion between them can stop the mutual collision of crystallite, thus avoid the formation of megacryst, make dirty crystal more dispersed.
Wherein each component molar ratio is maleic anhydride: acrylic acid: 2-acrylamide-2-methyl-propane sulfonic acid=19:8:1, quality is than ammonium persulfate: ortho phosphorous acid dihydro is received: total monomer=3:4:20, during reaction, first add maleic anhydride, ortho phosphorous acid sodium dihydrogen and deionized water successively, dissolve under 80 degree, add acrylic acid, ammonium persulfate, 2-acrylamide-2-methyl-propane sulfonic acid subsequently successively, be heated to 100 degrees Celsius and continue 4 hours.
2, electrochemical method scale removal
Utilize electrochemical principle; cathodic protection inhibition means are combined with descalling technique; adopt sacrificial anode mode; the equipment that fouling is serious or the wire netting that pipeline laid inside one deck Mg-6Al-3Zn-Mn alloy is made; at pipeline two ends or device interior turnover is bending etc. that key position carries out reinforcement of weld; when equipment installation is in Korrosionsmedium; due to the galvanic series of magnesium alloy in water, comparatively carbon steel is more negative; so preferentially lose electronics as anode to be corroded; it is protected that pipe-line equipment obtains electronics as negative electrode, plays corrosion inhibition.
Meanwhile, this magnesium alloy anode net can also play good descale effect, and mechanism of action has following 3 points:
(1) when pipe-line equipment interior surface is covered by dirty thing; due to acid autocatalysis; the lower medium of dirt is in acid; ph value can reach 2-3; magnesium alloy and equipment pipe inwall are buried by dirt; under being in acid anaerobic environment, there is gas-evolving electrodes, Mg-2e-=Mg2+ obtaining inner surface of pipeline (i.e. magnesium alloy net mesh place) as negative electrode; 2H++2e-=H2 ↑.Pipe-line equipment inwall produces hydrogen bubble, and hydrogen bubble to be gathered on dirty thing lower surface with calcium carbonate scale, and dirty layer and pipe-line equipment inwall adhesion are died down, make dirty Rotating fields loosen simultaneously, under media flow effect, can more easily be washed away by medium, reach the object reducing dirty layer thickness.
(2) magnesium alloy can regulate the concentration rate of magnesium ion and calcium ion in medium after dissolving, experimentally result, although Mg2+ also belongs to scale-forming ion, but when Mg2+ and Ca2+ exists simultaneously, the accumulation of dirty layer can be suppressed, Fig. 2 is the relation scatter diagram of induction period of scaling and Mg2+/Ca2+, provides Mg2+ and Ca2+ concentration ratio.
From scatter diagram, magnesium ion and calcium ion concentration are than higher, induction period of scaling is longer, and it is because have two, and first, the salt effect of dissolving, when salt content increases, the corresponding ion concentration that improve in water, due to interionic mutual electrostatic interaction, make the hypoergy of incrustation ion, reduce scale velocity; The second, containing in the solution of Mg2+, Mg2+ can be rapidly absorbed in calcite lattice and Ca2+ combines, because the water molecules force rate Ca2+ of Mg2+ is strong, so its solubility is larger than simple groundwater, induction period of scaling can be extended.
(3) Mg2+ can impel the aragonite Structure Transformation of calcite structure C aCO3 crystal to non-scaling of fouling.
Wherein exasperate sphaerocrystal structure is harder, exert pressure under slide and find that its mechanical strength is very high, light face spherical structure quality is softer, the low easy fragmentation of mechanical strength is washed away, as seen from the above table, along with magnesium ion concentration and calcium ion concentration are than raising, crystal structure mechanical strength declines gradually, habit and structure also can gradually change, so the existence of magnesium ion helps lend some impetus to calcium carbonate crystal by becoming dirty crystalline form to not becoming dirty crystal phase transition.
3, physical method monitoring
For the effect of chemical method scale inhibition and electrochemical method scale removal, physical method is adopted to carry out water quality monitoring at structural device line downstream place, water stabilization index and saturation index is calculated by measuring various ion component in water, detect its water quality scaling tendency, and can assess equipment installation descale effect by detecting median particle size in water, if desired, in downstream lacing film point position, place installs porous fouling lacing film additional, or bypass is set, by soaking piezoelectric quartz crystal, by soaking the concussion frequency difference of front and back, carry out attachment analysis once in 3 to 5 days, or the potential difference that the upper and lower surface utilizing sense voltage meter on-line determination to cause stress deformation because dirty thing ulking thickness increases to piezoelectric quartz crystal and produce raises gradually, pressure variety is extrapolated by unit of account time inter potential variable quantity, according to the dirty thing sample rate extracted from field working conditions, scaling rate (mm/a) can be calculated, thus the object reached the monitoring of fouling treatment effect, when having there is problem in processing procedure, also be convenient to look for one's roots fast and study carefully the very crux that problem is found in source.
First the present invention will carry out the selection of antisludging agent for platform, concrete selection mode can choose static state deposition method and Bubbling method, if the change of this platform working condition pressure is little, what calcium ion content was higher then chooses static state deposition method, if this platform working condition pressure changes greatly, takes Bubbling method.The material selection Mg-6Al-3Zn-Mn alloy of magnesium alloy anti-corrosion, scale-inhibiting net, utilize superplastic die forging, fine-grained alloy is pulled out at 1/2nd temperature of fusing point kelvin degree, ensure that not producing necking down causes netting twine in use surprisingly to rupture, its specification is diameter 1mm, diamond-shaped meshes, mesh size freely can adjust according to platform water quality scaling tendency, scaling tendency is large, and then mesh size is little, at netting twine side twine infall, suitably install material reed of the same race additional, ensure netting twine can with inside pipe wall good contact, net is curling according to girth cutting in pipe, be lining in pipeline, be adjacent to inwall, reed is in netting twine and tube wall is close to side, argon arc welding is used not suffer damage in welding process to protect anode network at pipe end and equipment inner bending place.After the installation of anti-corrosion, scale-inhibiting net, line equipment is come into operation, and thoroughly do away with field working conditions determination antisludging agent interpolation consumption.Simultaneously, in protected line sections and equipment two ends, bypass is set, bypass two ends are installed can the section of closing valve, bypass connecing one can open and close type casing, a slice piezoelectric quartz thin slice is settled in casing, its upper and lower surface is parallel with media flow direction, a plate electrode is respectively pasted in upper and lower surface, casing is drawn with wire, the external sense voltage meter of casing, record quartz plate upper and lower surface potential difference can be measured, according in the unit interval, the variable quantity of upper surface potential difference, can show that in the unit interval, quartz plate surface is subject to STRESS VARIATION amount, heap incrustation material amount is extrapolated according to quartz plate surface area, thus according to the dirty thing sample rate extracted in the operating mode measured, calculate in this unit interval, dirt thing stackeding speed (mm/a).
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a processing method for offshore production platform line equipment internal incrustation problem, is characterized in that, the processing method of described offshore production platform line equipment internal incrustation problem comprises the following steps: chemical method carries out scale inhibition; Electrochemical method scale removal; Physical method is monitored;
The step that the processing method of described offshore production platform line equipment internal incrustation problem is concrete is:
Chemical method carries out scale inhibition: choose suitable corrosion inhibiter according to platform operating mode and water type and Scaling Formation Origin, added by the dosing mouth of equipment and pipeline, by peptizaiton, chelating and complexing, flocculation and distortion of lattice effect, alleviate water quality scaling tendency, extend induction period of scaling, reduce water quality fouling tendency; Adopting with ammonium persulfate is initator, by the method for aqueous solution polymerization, synthesize the medicament of water miscible maleic anhydride/acrylic acid/2-acrylamide-2-methyl-propane sulfonic acid/inferior sodium phosphate copolymer, the Active Growth point on nucleus is first adsorbed on by co-polymer, make crystal can not in strict accordance with lattice arrangement normal growth, crystal is distorted, the crystallite of its adsorbable multiple identical charges of chain structure simultaneously, electrostatic repulsion between them can stop the mutual collision of crystallite, thus avoid the formation of megacryst, make dirty crystal more dispersed; During reaction, first add maleic anhydride, ortho phosphorous acid sodium dihydrogen and deionized water successively, dissolve under 80 degree, add acrylic acid, ammonium persulfate, 2-acrylamide-2-methyl-propane sulfonic acid subsequently successively, be heated to 100 degrees Celsius and continue 4 hours;
Electrochemical method scale removal: the use of magnesium alloy anti-corrosion, scale-inhibiting net, utilize superplastic die forging, fine-grained alloy is pulled out at 1/2nd temperature of fusing point kelvin degree, its specification is diameter 1mm, diamond-shaped meshes, mesh size freely can adjust according to platform water quality scaling tendency, scaling tendency is large, and then mesh size is little, at netting twine side twine infall, suitably install material reed of the same race additional, ensure netting twine can with inside pipe wall good contact, net is curling according to girth cutting in pipe, be lining in pipeline, be adjacent to inwall, reed is in netting twine and tube wall is close to side, argon arc welding is used not suffer damage in welding process to protect anode network at pipe end and equipment inner bending place,
Physical method is monitored: after the installation of anti-corrosion, scale-inhibiting net, line equipment is come into operation, and add consumption according to exhausted field working conditions determination antisludging agent, simultaneously, in protected line sections and equipment two ends, bypass is set, bypass two ends are installed can the section of closing valve, bypass connecing one can open and close type casing, built-in piezoelectric quartz thin slice, on cover a slice and carry dirty plate, parallel with water body flow direction, piezoelectric quartz upper and lower surface connecting electrode, connect outside sense voltage meter, by measuring voltage change ratio, calculate that in the unit interval, dirty thing piles up quality, thus according to the dirty thing sample rate extracted in the operating mode measured, and carry dirty plate effective surface area, calculate in this unit interval, dirt thing stackeding speed.
2. the processing method of offshore production platform line equipment internal incrustation problem as claimed in claim 1, is characterized in that, described chemical method carries out the principle that scale inhibition utilizes distortion of lattice effect and cohesion peptizaiton.
3. the processing method of offshore production platform line equipment internal incrustation problem as claimed in claim 1, is characterized in that, described magnesium alloy material selection Mg-6Al-3Zn-Mn alloy.
4. the processing method of offshore production platform line equipment internal incrustation problem as claimed in claim 1, is characterized in that, described physical method monitoring also comprises can open and close type casing, piezoelectric quartz thin slice, sense voltage meter; Settle described piezoelectric quartz thin slice in described casing, described sense voltage meter is set outside described casing.
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| CN101255560A (en) * | 2007-02-26 | 2008-09-03 | 李英范 | LYF-A oil extraction long-acting corrosion inhibition anticrustator |
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| CN2588041Y (en) * | 2002-09-02 | 2003-11-26 | 长庆石油勘探局工程技术研究院 | Short-section type corrosion-resisting device for oil pipe |
| CN200996922Y (en) * | 2006-07-10 | 2007-12-26 | 大庆油田有限责任公司 | Antifouling performance evaluating experimental device |
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