CN103111446A - 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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- 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, relate in particular to a kind of processing method of offshore production platform line equipment internal incrustation problem.
Background technology
When at present offshore production platform carries out fouling and processes, usually adopt simple interpolation antisludging agent or carry out the traditional means such as pickling replace tubes, the part platform adopts mechanical descaling's means, present existing means, and part more or less all comes with some shortcomings.In traditional scale removal mode, the most widely used means are pickling, and the process of pickling is mainly that line equipment is stopped work, and inject acid fluid dissolves dirt layer, and the pickle main component is hydrochloric acid, concentration about 10% left and right, and its main chemistry reflection equation is:
CaCO3+2HCl=CaCl2+H2O+CO2↑
MgCO3+2HCl=MgCl2+H2O+CO2↑
FeS+2HCl=FeCl2+H2S↑
pickling descaling cost comparatively speaking is lower, easy and simple to handle, but meanwhile, the fouling position effect that pickling effects on surface sedimentation layer is thicker is relatively poor, and remaining acid solution easily pollutes, it is only to reduce dirty layer thickness to the control of fouling, do not solve from the dirt layer origin cause of formation, so need to regularly carry out pickling in the pipeline useful life, compare labor intensive, and use pickling descaling, after dirty layer thickness reduces, the underdeposit corrosion perforation easily occurs, adopt electrochemical method to carry out scale removal in the present invention, thoroughly avoided the operation of pipeline pickling on the platform, not only can enhance productivity, can also avoid the conduit wiring piercing that causes because of pickling, greatly improved the security of producing, adding antisludging agent is also one of platform scale inhibition means commonly used, its mechanism has following 4 points usually:
1. peptizaiton
Low-molecular-weight polymer, higher electric line density is generally arranged, can produce interionic repulsion, copolymer also has characteristics of surfactants, they are surrounded colloidal solid in solution and are stable state and take away with water, 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 chelating ion or the complex ion of solubility, thereby suppress cation (as Ca2+, Mg2+, Ba2+) and anion (CO32-, SO42-) in conjunction with producing precipitation, ATMP and EDTA are typically arranged
3. flocculation
The colloidal solid that contains CaCO3 and CaSO4 nucleus in water is adsorbed on forms alumen ustum on the chain of high molecular polymer and be suspended in water, play scale effect, poly amic acid and Sodium Polyacrylate are typically arranged,
4. distortion of lattice effect
In the process that forms the crystal dirt, there is high molecular polymer to enter crystal structure, destroyed the crystal normal growth, and made the crystal distorted, changed original regular texture, make crystal no longer continue to increase, thereby prevent or alleviate fouling.simple interpolation antisludging agent carries out scale removal, often be difficult to reach effect preferably, reason have following some: one, antisludging agent adding proportion and dosage need to be determined 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, can't play good scale inhibition effect in this process, they are two years old, the effect of antisludging agent tends to reduce inner dirt layer formation trend, extend the induction period of scaling time, can't suppress scale problems from root, and along with time cumulation, when dirt layer gradually after moulding, can't effectively reduce dirty layer thickness, cause the scale inhibition result to be had a greatly reduced quality, simultaneously, to consider also when adding antisludging agent whether it exists with conventional corrosion inhibiter and conflict, if it is improper to choose, not only can not reach desirable effect, might accelerate on the contrary the erosion and encrustation problem of pipeline, although and corrosion inhibiting and descaling agent commonly used for example EDTMPS can reach simultaneously the effect of slowing down corrosion and scale inhibition, but mainly for calcium sulfate, barium sulfate scale, and the offshore platform fouling is mainly calcium carbonate scale, be difficult to reach effect preferably.utilize electrochemical method effectively to reduce molded dirty layer thickness, thereby avoid the problem of antisludging agent decrease in efficiency, simultaneously, the existence of antisludging agent also produces facilitation effect to electrochemical means scale removal efficient, and initiative inhibition anode loss protection means are combined with the scale removal means, can reach the purpose of slowing down the line equipment corrosion in scale removal, the means of carrying out inhibition by adding corrosion inhibiter have been replaced, thereby avoided the erosion and encrustation situation penalty issue of conflicting with the antisludging agent composition and causing due to conventional corrosion inhibiter, mechanical descaling's mode that the part platform adopts is mainly to utilize powerful wiper, magnetic pipeline cleaner is arranged, nail wheel wiper and brush wheel wiper etc., the wiper scale removal compare with other scale removal mode have easy and simple to handle, price is low, short construction period, the workmen is few, construction equipment is simple, intensity is low, the characteristics such as pollution-free, but wiper is rectilinear motion, clean out dirt layer in pipe, generally need 5～6 times, sometimes reach 10 times, pigging efficient is low, of poor quality, simultaneously when line equipment internal structure complexity has the turning, wiper can't normal operation, and, when carrying out mechanical descaling, easily damage and cut are in various degree caused in line equipment inside, corrosion easily increases the weight of in damage and cut appearance place development.
As seen, every kind of descaling method all has its inevitable defective, when platform is chosen descaling method, often choose single method or appoint several method to mix at random, can not effectively different scale inhibition means be combined, make up mutually and maximize favourable factors and minimize unfavourable ones, so be difficult to reach the treatment effect of expectation, simultaneously, inappropriate scale inhibition means also can cause certain damage to line equipment, so, there is no now a kind of method that rationally effectively offshore production platform calcium carbonate scaling problem is dealt with.
Summary of the invention
the object of the invention is to utilize a kind of processing method of offshore production platform line equipment internal incrustation problem, be intended to solve existing every kind of descaling method its inevitable defective is all arranged, when platform is chosen descaling method, often choose single method or appoint several method to mix at random, can not effectively different scale inhibition means be combined, make up mutually and maximize favourable factors and minimize unfavourable ones, so be difficult to reach the treatment effect of expectation, simultaneously, inappropriate scale inhibition means also can cause certain damage to line equipment, there is no now a kind of problem of the method that rationally effectively offshore production platform calcium carbonate scaling problem is dealt 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 is carried out scale inhibition; The electrochemical method scale removal; The physical method monitoring.
Further, the concrete step of processing method of described offshore production platform line equipment internal incrustation problem is:
chemical method is carried out scale inhibition: choose suitable corrosion inhibiter according to platform operating mode and water type and Scaling Formation Origin, dosing mouth by equipment and pipeline adds, pass through peptizaiton, chelating and complexing, flocculation and distortion of lattice effect, alleviate the water quality scaling tendency, extend induction period of scaling, reduce the water quality fouling tendency, for example adopt take ammonium persulfate as initator, method by aqueous solution polymerization, the medicament that has synthesized water miscible maleic anhydride/acrylic acid/2-acrylamide-2-methyl-propyl sulfonic acid/inferior sodium phosphate copolymer, first be adsorbed on active growing point on nucleus by co-polymer, make the crystal can not be in strict accordance with the lattice arrangement normal growth, make the crystal distorted, the crystallite of its adsorbable a plurality of identical charges of chain structure simultaneously, electrostatic repulsion between them can stop the mutual collision of crystallite, thereby avoided the formation of megacryst, make more Uniform Dispersion of dirty crystal.During reaction, first add successively maleic anhydride, ortho phosphorous acid sodium dihydrogen and deionized water, dissolving under 80 degree adds acrylic acid, ammonium persulfate, 2-acrylamide-2-methyl-propyl sulfonic acid subsequently successively, is heated to 100 degrees centigrade and continues 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 guarantee that not producing necking down causes the unexpected fracture of netting twine in use, its specification is diameter 1mm, diamond-shaped meshes, mesh size can freely be adjusted according to platform water quality scaling tendency, scaling tendency greatly mesh size is little, at netting twine one side twine infall, suitably install material reed of the same race additional, guarantee netting twine can with the 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 a side, pipe end and equipment inner bending place use argon arc welding with the protection anode network do not suffer damage in welding process '
physical method monitoring: after the installation of anti-corrosion, scale-inhibiting net, line equipment is come into operation, and thoroughly do away with field working conditions and determine that antisludging agent adds consumption, simultaneously, in protected line sections and equipment two ends, bypass is set, install at the bypass two ends can the section of closing valve, but connect an open and close type casing in bypass, built-in piezoelectric quartz thin slice, on cover a slice and carry dirty plate, parallel with the water body flow direction, piezoelectric quartz upper and lower surface connecting electrode, connect outside sensitive potentiometer, by measuring voltage change ratio, calculate that in the unit interval, dirty thing is piled up quality, thereby according to the dirty thing sample rate that extracts in the operating mode of measuring, and year dirty plate effective surface area, calculate in this unit interval, dirt thing stackeding speed (mm/a).
Further, described chemical method is carried out the principle that scale inhibition utilizes distortion of lattice effect and cohesion peptizaiton.
Further, to carry out each composition mol ratio of scale inhibition be maleic anhydride to described chemical method: acrylic acid: 2-acrylamide-2-methyl-propyl sulfonic acid=19:8:1, quality is than ammonium persulfate: the ortho phosphorous acid dihydro is received: total monomer=3:4:20.
Further, described magnesium alloy material is selected the Mg-6Al-3Zn-Mn alloy.
Further, but described physical method monitoring also comprises open and close type casing, piezoelectric quartz thin slice, sensitive potentiometer; Settle described piezoelectric quartz in described casing, described casing arranges described sensitive potentiometer outward.
the processing method of offshore production platform line equipment internal incrustation problem provided by the invention, according to scale inhibition, scale removal, the coherent processing offshore production platform of the thinking equipment installation scale problems of fouling monitoring, problem has appearred in processing procedure, also be convenient to look for one's roots fast and study carefully the very crux that problem is found in the source, simultaneously, when processing platform erosion and encrustation problem in the past, the solution of corrosion and scale problems opposes often, processing 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 with scale removal anticorrosion, added merely the time limit that antisludging agent can only extend replace tubes or pickling in the past, can't thoroughly avoid pickling or replace tubes, and this method utilizes electrochemical means to overcome the shortcoming that antisludging agent can't effectively reduce molded dirty layer thickness, thoroughly avoided corrosion that pickling causes pipeline and pickling replace tubes to the delay of producing and the expenditure that has reduced manpower, meanwhile, the existence of antisludging agent also produces facilitation effect to electrochemical means scale removal efficient, utilize simultaneously physical method that fouling effect and water quality scaling tendency are monitored, be convenient to understand at any time the fouling tendency of line equipment in result, pinpoint the problems and deal with problems in the very first time, the problem of having avoided causing due to delay is aggravated, preferably resolve the long construction period of the processing method existence of existing offshore production platform line equipment internal incrustation, the problem that cleaning efficiency is low, in addition, the present invention is easy to operate, result of use is obvious, good using value is arranged.
Description of drawings
Fig. 1 is the realization flow figure of the processing method of the offshore production platform line equipment internal incrustation problem that provides of the embodiment of the present invention.
Fig. 2 is the scatter diagram that concerns of induction period of scaling and Mg2+/Ca2+.
The specific embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, 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, is not intended to limit the present invention.
The embodiment of the present invention provides a kind of processing method of offshore production platform line equipment internal incrustation problem, and the processing method of this offshore production platform line equipment internal incrustation problem comprises: chemical method is carried out scale inhibition; The electrochemical method scale removal; The physical method monitoring.
As a prioritization scheme of the embodiment of the present invention, the concrete step of processing method of offshore production platform line equipment internal incrustation problem is:
chemical method is carried out scale inhibition: choose suitable corrosion inhibiter according to platform operating mode and water type and Scaling Formation Origin, dosing mouth by equipment and pipeline adds, pass through peptizaiton, chelating and complexing, flocculation and distortion of lattice effect, alleviate the water quality scaling tendency, extend induction period of scaling, reduce the water quality fouling tendency, employing is take ammonium persulfate as initator, method by aqueous solution polymerization, the medicament that has synthesized water miscible maleic anhydride/acrylic acid/2-acrylamide-2-methyl-propyl sulfonic acid/inferior sodium phosphate copolymer, first be adsorbed on active growing point on nucleus by co-polymer, make the crystal can not be in strict accordance with the lattice arrangement normal growth, make the crystal distorted, the crystallite of its adsorbable a plurality of identical charges of chain structure simultaneously, electrostatic repulsion between them can stop the mutual collision of crystallite, thereby avoided the formation of megacryst, make more Uniform Dispersion of dirty crystal.During reaction, first add successively maleic anhydride, ortho phosphorous acid sodium dihydrogen and deionized water, dissolving under 80 degree adds acrylic acid, ammonium persulfate, 2-acrylamide-2-methyl-propyl sulfonic acid subsequently successively, is heated to 100 degrees centigrade and continues 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 guarantee that not producing necking down causes the unexpected fracture of netting twine in use, its specification is diameter 1mm, diamond-shaped meshes, mesh size can freely be adjusted according to platform water quality scaling tendency, scaling tendency greatly mesh size is little, at netting twine one side twine infall, suitably install material reed of the same race additional, guarantee netting twine can with the 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 a side, pipe end and equipment inner bending place use argon arc welding with the protection anode network do not suffer damage in welding process '
physical method monitoring: after the installation of anti-corrosion, scale-inhibiting net, line equipment is come into operation, and thoroughly do away with field working conditions and determine that antisludging agent adds consumption, simultaneously, in protected line sections and equipment two ends, bypass is set, install at the bypass two ends can the section of closing valve, but connect an open and close type casing in bypass, built-in piezoelectric quartz thin slice, on cover a slice and carry dirty plate, parallel with the water body flow direction, piezoelectric quartz upper and lower surface connecting electrode, connect outside sensitive potentiometer, by measuring voltage change ratio, calculate that in the unit interval, dirty thing is piled up quality, thereby according to the dirty thing sample rate that extracts in the operating mode of measuring, and year 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 is carried 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 is carried out each composition mol ratio of scale inhibition: acrylic acid: 2-acrylamide-2-methyl-propyl sulfonic acid=19:8:1, quality is than ammonium persulfate: the ortho phosphorous acid dihydro is received: total monomer=3:4:20.
As a prioritization scheme of the embodiment of the present invention, the magnesium alloy material is selected the Mg-6Al-3Zn-Mn alloy.
As a prioritization scheme of the embodiment of the present invention, but the physical method monitoring also comprises open and close type casing, piezoelectric quartz thin slice, sensitive potentiometer; Settle piezoelectric quartz in casing, casing arranges sensitive potentiometer outward.
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, utilize chemical method to carry out scale inhibition;
Choose suitable corrosion inhibiter according to platform operating mode and water type and Scaling Formation Origin, dosing mouth by equipment and pipeline adds, by peptizaiton, chelating and complexing, flocculation and distortion of lattice effect, alleviate the water quality scaling tendency, extend induction period of scaling, reduce the water quality fouling tendency.
recommend at present the platform of zone, Bohai Sea mixed water injection mode water filling to adopt take ammonium persulfate as initator, method by aqueous solution polymerization, the medicament that has synthesized water miscible maleic anhydride/acrylic acid/2-acrylamide-2-methyl-propyl sulfonic acid/inferior sodium phosphate copolymer, utilize distortion of lattice effect and two kinds of principles of cohesion peptizaiton, first be adsorbed on active growing point on nucleus by co-polymer, make the crystal can not be in strict accordance with the lattice arrangement normal growth, make the crystal distorted, the crystallite of its adsorbable a plurality of identical charges of chain structure simultaneously, electrostatic repulsion between them can stop the mutual collision of crystallite, thereby avoided the formation of megacryst, make more Uniform Dispersion of dirty crystal.
Wherein each composition mol ratio is maleic anhydride: acrylic acid: 2-acrylamide-2-methyl-propyl sulfonic acid=19:8:1, quality is than ammonium persulfate: the ortho phosphorous acid dihydro is received: total monomer=3:4:20, during reaction, first add successively maleic anhydride, ortho phosphorous acid sodium dihydrogen and deionized water, dissolving under 80 degree, add successively subsequently acrylic acid, ammonium persulfate, 2-acrylamide-2-methyl-propyl sulfonic acid, be heated to 100 degrees centigrade and continue 4 hours.
In step S102, utilize the electrochemical method scale removal;
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 guarantee that not producing necking down causes the unexpected fracture of netting twine in use, its specification is diameter 1mm, diamond-shaped meshes, mesh size can freely be adjusted according to platform water quality scaling tendency, scaling tendency greatly mesh size is little, at netting twine one side twine infall, suitably install material reed of the same race additional, guarantee netting twine can with the 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 a side, use argon arc welding not suffer damage in welding process with the protection anode network at pipe end and equipment inner bending place.
In step S103, utilize the physical method monitoring.
After the installation of anti-corrosion, scale-inhibiting net, line equipment is come into operation, and thoroughly do away with field working conditions and determine that antisludging agent adds consumption.simultaneously, in protected line sections and equipment two ends, bypass is set, install at the bypass two ends can the section of closing valve, but connect an open and close type casing in bypass, settle a slice piezoelectric quartz thin slice in casing, its upper and lower surface is parallel with the media flow direction, respectively paste a plate electrode in upper and lower surface, draw casing with wire, casing external one sensitive potentiometer, can measure and record quartz plate upper and lower surface current potential difference, within the unit interval, the variable quantity of upper surface current potential difference, extrapolate according to the quartz plate surface area and pile up dirty amount, can draw that the quartz plate surface is subject to the STRESS VARIATION amount in the unit interval, thereby according to the dirty thing sample rate that extracts in the operating mode of measuring, calculate in this unit interval, dirt thing stackeding speed (mm/a).
Operation principle of the present invention is:
1, chemical method scale inhibition
Choose suitable corrosion inhibiter according to platform operating mode and water type and Scaling Formation Origin, dosing mouth by equipment and pipeline adds, by peptizaiton, chelating and complexing, flocculation and distortion of lattice effect, alleviate the water quality scaling tendency, extend induction period of scaling, reduce the water quality fouling tendency.
Carry out the mode of antisludging agent selection and can choose static state deposition method and Bubbling method, little if this platform working condition pressure changes, the static state deposition method of choosing that calcium ion content is higher is more taked Bubbling method if this platform working condition pressure changes.
recommend at present the platform of zone, Bohai Sea mixed water injection mode water filling to adopt take ammonium persulfate as initator, method by aqueous solution polymerization, the medicament that has synthesized water miscible maleic anhydride/acrylic acid/2-acrylamide-2-methyl-propyl sulfonic acid/inferior sodium phosphate copolymer, utilize distortion of lattice effect and two kinds of principles of cohesion peptizaiton, first be adsorbed on active growing point on nucleus by co-polymer, make the crystal can not be in strict accordance with the lattice arrangement normal growth, make the crystal distorted, the crystallite of its adsorbable a plurality of identical charges of chain structure simultaneously, electrostatic repulsion between them can stop the mutual collision of crystallite, thereby avoided the formation of megacryst, make more Uniform Dispersion of dirty crystal.
Wherein each composition mol ratio is maleic anhydride: acrylic acid: 2-acrylamide-2-methyl-propyl sulfonic acid=19:8:1, quality is than ammonium persulfate: the ortho phosphorous acid dihydro is received: total monomer=3:4:20, during reaction, first add successively maleic anhydride, ortho phosphorous acid sodium dihydrogen and deionized water, dissolving under 80 degree, add successively subsequently acrylic acid, ammonium persulfate, 2-acrylamide-2-methyl-propyl sulfonic acid, be heated to 100 degrees centigrade and continue 4 hours.
2, electrochemical method scale removal
Utilize electrochemical principle; cathodic protection inhibition means are combined with descalling technique; adopt the sacrificial anode mode; the wire netting that the equipment that fouling is serious or pipeline laid inside one deck Mg-6Al-3Zn-Mn alloy are made; at the pipeline two ends or device interior turnover is crooked etc. that key position carries out reinforcement of weld; when equipment installation is in Korrosionsmedium; galvanic series due to magnesium alloy in water is more negative than carbon steel; so preferentially losing electronics as anode is corroded; it is protected that pipe-line equipment gets electronics as negative electrode, plays corrosion inhibition.
Simultaneously, this magnesium alloy anode net can also play descale effect preferably, and mechanism of action has following 3 points:
(1) when surface, pipe-line equipment inside is covered by dirty thing, due to acid autocatalysis, the lower medium of dirt is acid, the ph value can reach 2-3, magnesium alloy and equipment pipe inwall are buried by dirt, be under acid anaerobic environment, getting the corrosion of inner surface of pipeline (being magnesium alloy net mesh place) generation liberation of hydrogen, Mg-2e-=Mg2+ as negative electrode; 2H++2e-=H2 ↑.Produce the hydrogen bubble on the pipe-line equipment inwall, the hydrogen bubble be gathered on dirty thing lower surface with calcium carbonate scale in, the dirt layer is died down with pipe-line equipment inwall adhesion, make simultaneously dirt layer short texture, under the media flow effect, can more easily be washed away by medium, reach the purpose that reduces dirty layer thickness.
(2) can regulate the concentration rate of magnesium ion and calcium ion in medium after magnesium alloy dissolving, according to experimental result, although Mg2+ also belongs to scale-forming ion, but when Mg2+ and Ca2+ exist simultaneously, can suppress the accumulation of dirt layer, Fig. 2 is the scatter diagram that concerns of induction period of scaling and Mg2+/Ca2+, Mg2+ and Ca2+ concentration ratio are provided.
By scatter diagram as seen, magnesium ion is higher with the calcium ion concentration ratio, induction period of scaling is longer, and its factor has two, the first, the salt effect of dissolving, when salt content increases, correspondingly improved the ion concentration in water, due to interionic mutual electrostatic interaction, make the hypoergy of incrustation ion, reduced scale velocity; The second, in containing the solution of Mg2+, Mg2+ can be absorbed to enter in the calcite lattice and combine with Ca2+, 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 calcite structure C aCO3 crystal of fouling to the aragonite Structure Transformation of non-scaling.
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, and along with magnesium ion concentration and calcium ion concentration ratio raise, the crystal structure mechanical strength descends 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
effect for chemical method scale inhibition and electrochemical method scale removal, adopt physical method to carry out water quality monitoring at structural device line downstream place, in water, various ion components calculate water stabilization index and saturation index by measuring, detect its water quality scaling tendency, and can assess the equipment installation descale effect by median particle size in detection water, in case of necessity, the place installs porous fouling lacing film additional in downstream lacing film point position, bypass perhaps is set, by soaking piezoelectric quartz crystal, by the concussion frequency difference before and after soaking, carry out attachment analysis once in 3 to 5 days, perhaps utilize sensitive potentiometer on-line determination to increase the potential difference that causes upper and lower surface that stress deformation produces to raise gradually to piezoelectric quartz crystal due to dirty thing ulking thickness, extrapolate pressure variety by unit of account time inter potential variable quantity, according to the dirty thing sample rate that extracts from field working conditions, can calculate scaling rate (mm/a), thereby reach the purpose to the monitoring of fouling treatment effect, when problem having occurred in processing procedure, also be convenient to look for one's roots fast and study carefully the very crux that problem is found in the source.
At first the present invention will carry out for platform the selection of antisludging agent, concrete selection mode can be chosen static state deposition method and Bubbling method, if this platform working condition pressure changes little, the static state deposition method of choosing that calcium ion content is higher is more taked Bubbling method if this platform working condition pressure changes.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, guarantee not produce necking down and cause the unexpected fracture of netting twine in use, its specification is diameter 1mm, diamond-shaped meshes, mesh size can freely be adjusted according to platform water quality scaling tendency, scaling tendency greatly mesh size is little, at netting twine one side twine infall, suitably install material reed of the same race additional, guarantee netting twine can with the 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 a side, use argon arc welding not suffer damage in welding process with the protection 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 and determine that antisludging agent adds consumption.simultaneously, in protected line sections and equipment two ends, bypass is set, install at the bypass two ends can the section of closing valve, but connect an open and close type casing in bypass, settle a slice piezoelectric quartz thin slice in casing, its upper and lower surface is parallel with the media flow direction, respectively paste a plate electrode in upper and lower surface, draw casing with wire, casing external one sensitive potentiometer, can measure and record quartz plate upper and lower surface current potential difference, within the unit interval, the variable quantity of upper surface current potential difference, can draw that the quartz plate surface is subject to the STRESS VARIATION amount in the unit interval, extrapolate according to the quartz plate surface area and pile up dirty amount, thereby according to the dirty thing sample rate that extracts in the operating mode of measuring, calculate in this unit interval, dirt thing stackeding speed (mm/a).
The above is only preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. the processing method of an 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 is carried out scale inhibition; The electrochemical method scale removal; The physical method monitoring.
2. the processing method of offshore production platform line equipment internal incrustation problem as claimed in claim 1, is characterized in that, the concrete step of processing method of described offshore production platform line equipment internal incrustation problem is:
Chemical method is carried out scale inhibition: choose suitable corrosion inhibiter according to platform operating mode and water type and Scaling Formation Origin, dosing mouth by equipment and pipeline adds, by peptizaiton, chelating and complexing, flocculation and distortion of lattice effect, alleviate the water quality scaling tendency, extend induction period of scaling, reduce the water quality fouling tendency;
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 can freely be adjusted according to platform water quality scaling tendency, scaling tendency greatly mesh size is little, at netting twine one side twine infall, suitably install material reed of the same race additional, guarantee netting twine can with the 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 a side, use argon arc welding not suffer damage in welding process with the protection anode network at pipe end and equipment inner bending place,
physical method monitoring: after the installation of anti-corrosion, scale-inhibiting net, line equipment is come into operation, and thoroughly do away with field working conditions and determine that antisludging agent adds consumption, simultaneously, in protected line sections and equipment two ends, bypass is set, install at the bypass two ends can the section of closing valve, but connect an open and close type casing in bypass, built-in piezoelectric quartz thin slice, on cover a slice and carry dirty plate, parallel with the water body flow direction, piezoelectric quartz upper and lower surface connecting electrode, connect outside sensitive potentiometer, by measuring voltage change ratio, calculate that in the unit interval, dirty thing is piled up quality, thereby according to the dirty thing sample rate that extracts in the operating mode of measuring, and year dirty plate effective surface area, calculate in this unit interval, dirt thing stackeding speed.
3. the processing method of offshore production platform line equipment internal incrustation problem as claimed in claim 2, is characterized in that, described chemical method is carried out the principle that scale inhibition utilizes distortion of lattice effect and cohesion peptizaiton.
4. the processing method of offshore production platform line equipment internal incrustation problem as claimed in claim 2, it is characterized in that, described chemical method is carried out each composition mol ratio of scale inhibition: maleic anhydride: acrylic acid: 2-acrylamide-2-methyl-propyl sulfonic acid=19:8:1, mass ratio is: ammonium persulfate: the ortho phosphorous acid dihydro is received: total monomer=3:4:20.
5. the processing method of offshore production platform line equipment internal incrustation problem as claimed in claim 2, is characterized in that, described magnesium alloy material is selected the Mg-6Al-3Zn-Mn alloy.
6. the processing method of offshore production platform line equipment internal incrustation problem as claimed in claim 2, is characterized in that, but the monitoring of described physical method also comprises open and close type casing, piezoelectric quartz thin slice, sensitive potentiometer;
Settle described piezoelectric quartz thin slice in described casing, described casing arranges described sensitive potentiometer outward.
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