CN113249104B - Scale inhibition and scale removal agent and preparation method thereof - Google Patents
Scale inhibition and scale removal agent and preparation method thereof Download PDFInfo
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- CN113249104B CN113249104B CN202010090124.9A CN202010090124A CN113249104B CN 113249104 B CN113249104 B CN 113249104B CN 202010090124 A CN202010090124 A CN 202010090124A CN 113249104 B CN113249104 B CN 113249104B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
Abstract
The application discloses a scale inhibition and scale removal agent and a preparation method thereof, and belongs to the field of oilfield exploitation. The scale inhibition and removal comprises the following components in parts by weight: 0.2-0.6 part of anti-swelling agent, 0.013-0.021 part of antiscaling agent, 0.004-0.005 part of methylated single-large cyclic polyamine, 0.01-0.02 part of antiscaling agent, 0.15-0.4 part of dispersing agent and the balance of water. Through the electronegativity neutralization between cations generated by the dissociation of the anti-swelling agent and the clay surface, the electrostatic repulsion of the clay is reduced, so that the swelling of the clay is inhibited; calcium sulfate or calcium carbonate can be directly converted into water-soluble substances through the antiscaling agent, so that the combination of scaling ions is avoided; dissolving calcium carbonate scale or calcium sulfate scale by methylating the mono-and macrocyclic polyamines; the above components are uniformly dispersed by a dispersant. The scale inhibition and scale removal agent provided by the application has the advantages of good scale removal effect, high scale removal rate, short scale removal time and low corrosion rate to equipment.
Description
Technical Field
The application relates to the field of oilfield exploitation, in particular to a scale inhibition and removal agent and a preparation method thereof.
Background
At present, each large oil field enters a middle and later development stage, the scaling and corrosion problems of oil-water wells become more serious, such as high-pressure oil-gas well operation and old block high-pressure water injection well operation, due to high pressureThe high-density workover fluid is required to be used, and the density of the high-pressure water injection well after long-term pressure release is 1.30-1.40g/cm 3 The liquid calcium well control fluid has the problems of incompatibility with the stratum and scaling, and the formation damage is often caused as a result, so the scale inhibitor and the scale remover are needed to treat the formed scaling.
The scale inhibiting and descaling agent provided by the related technology comprises: hydrochloric acid, sodium acetate, sodium citrate, sodium fluoride, polyoxyethylene abietate, nekal, sodium di-sec-octyl maleate sulfonate, solid chlorous anhydride and the balance of water.
The applicant has found that the related art has at least the following problems:
the scale-inhibiting and descaling agent adopting the related technology has short effective period and high cost, the corrosion of acid liquor to underground tools is more aggravated, and the site construction process is complex.
Disclosure of Invention
The embodiment of the application provides a scale inhibition and scale removal agent and a preparation method thereof, and can solve the problems that the scale inhibition and scale removal agent in the related technology has short effective period and high cost, aggravates the corrosion of acid liquor to downhole tools, and has a complex field construction process. The technical scheme is as follows:
in one aspect, the scale inhibition and removal agent comprises the following components in parts by weight: 0.2-0.6 part of anti-swelling agent, 0.013-0.021 part of antiscaling agent, 0.004-0.005 part of methylated single-large cyclic polyamine, 0.01-0.02 part of antiscaling agent, 0.15-0.4 part of dispersing agent and the balance of water.
In an alternative embodiment, the anti-swelling agent is potassium chloride.
In an alternative embodiment, the anti-scalant comprises: disodium maleate, gluconate, and bisulphide.
In an alternative embodiment, the disodium maleate salt is 0.004 to 0.005 part by weight, the gluconate salt is 0.005 to 0.01 part by weight, and the bis-sulfide is 0.004 to 0.006 part by weight.
In an alternative embodiment, the gluconate is potassium gluconate and/or sodium gluconate.
In an alternative embodiment, the detergent comprises hydrolyzed polymaleic anhydride and carboxyethylene diphosphonic acid.
In an alternative embodiment, the hydrolyzed polymaleic anhydride is present in an amount of 0.005 to 0.01 parts by weight and the carboxyethylenediphosphonic acid is present in an amount of 0.01 to 0.02 parts by weight.
In an alternative embodiment, the dispersant is sodium dodecylbenzene sulfonate.
In an alternative embodiment, the sodium dodecylbenzenesulfonate is present in an amount of 0.15 to 0.4 parts by weight.
In another aspect, there is provided a method for preparing a scale inhibiting and removing agent, the method comprising:
according to the weight parts of the components, water, the anti-swelling agent and the scale inhibitor are sequentially added, then stirred for a reference time, and then the scale inhibitor, the methylated single-large cyclic polyamine and the dispersant are sequentially added, and stirred for 5-10 minutes to obtain the scale inhibiting and removing agent.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
the scale inhibition and scale removal agent provided by the embodiment of the application neutralizes cations generated by dissociation of the anti-swelling agent and negative charges on the surface of clay, reduces electrostatic repulsion of the clay, and inhibits the swelling of the clay; calcium sulfate or calcium carbonate can be directly converted into water-soluble substances through the antiscaling agent, so that the combination of scaling ions is avoided; dissolving the formed calcium carbonate scale or calcium sulfate scale by the methylated mono-and macrocyclic polyamine; the components are uniformly dispersed by a dispersing agent to form a uniform system. The scale inhibition and scale removal agent provided by the embodiment of the application has good scale removal effect and high scale removal rate, and the experimental scale removal rate is more than or equal to 95%; the descaling time is short, and the working efficiency is improved; compared with the acid descaling system provided by the related technology, the system has neutral pH value and low corrosion rate, saves the operation cost, reduces the operation links, and prolongs the production period of the oil well due to the scale inhibition property.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of the mechanism of action of the scale and scale inhibitor provided by the embodiment of the invention.
Detailed Description
Unless defined otherwise, all technical terms used in the examples of the present application have the same meaning as commonly understood by one of ordinary skill in the art.
At present, each large oil field enters a middle and later development stage, the scaling and corrosion problems of oil-water wells become more serious day by day, for example, aiming at high-pressure oil-gas well operation and old block high-pressure water injection well operation, because high-density workover fluid is needed to be used under high pressure, at present, because few equipment for operating the oil field under pressure are used, a large amount of workover operation cannot be met in time, and the used density is 1.40-1.70g/cm 3 High density workover fluids are essentially purchased externally and are very costly. For the high-pressure water injection well workover, the use density is 1.30-1.40g/cm after long-term pressure release 3 The liquid calcium well control fluid has the problems of incompatibility with the stratum and scaling, and the stratum is damaged frequently as a result. And for example, each oil production plant in a large port oil field has serious self scaling phenomenon because the salinity of formation water is higher and is influenced by the change of temperature and pressure, and the scaling phenomenon is aggravated due to the invasion of various incompatible fluids in the well repairing operation process, so that high corrosion, low productivity and serious economic loss are often brought. In view of this, the embodiment of the present application provides a scale inhibition and scale prevention agent and a preparation method thereof, and aims to solve the technical problems.
On one hand, the embodiment of the application provides a scale inhibition and removal agent, which comprises the following components in parts by weight: 0.2-0.6 part of anti-swelling agent, 0.013-0.021 part of antiscaling agent, 0.004-0.005 part of methylated single-large cyclic polyamine, 0.01-0.02 part of antiscaling agent, 0.15-0.4 part of dispersing agent and the balance of water.
The scale inhibition and scale removal agent provided by the embodiment of the application at least has the following technical effects:
the scale and scale inhibitor provided by the embodiment of the application neutralizes electronegativity of cations generated by dissociation of the anti-swelling agent and the surface of clay, reduces electrostatic repulsion of the clay, and inhibits the swelling of the clay; calcium sulfate or calcium carbonate can be directly converted into water-soluble substances through the antiscaling agent, so that the combination of scaling ions is avoided; dissolving the formed calcium carbonate scale or calcium sulfate scale by the methylated mono-and macrocyclic polyamine; the components are uniformly dispersed by a dispersing agent to form a uniform system. The scale inhibition and scale removal agent provided by the embodiment of the application has a good scale removal effect and a high scale removal rate, and the experimental scale removal rate is more than or equal to 95%; the descaling time is short, and the working efficiency is improved; compared with the acid descaling system provided by the related technology, the system has neutral pH value and low corrosion rate, saves the operation cost, reduces the operation links, and prolongs the production period of the oil well due to the scale inhibition property.
The scale inhibiting and descaling agent provided by the embodiment of the application is further described by the optional embodiment.
In an alternative embodiment, the anti-swelling agent is potassium chloride.
Potassium chloride generates potassium ions after ionization in aqueous solution, the potassium ions carry positive charges to neutralize the clay with negative charges, the clay is prevented from swelling,
in an alternative embodiment, the anti-fouling agent comprises: disodium maleate, gluconate, and bisulphide.
The disodium maleate salt can disperse the scaling ions in the gluconate and the dithioether, so that scaling caused by combination of the scaling ions is avoided. As an example, the scale inhibitor may be any one of disodium maleate, gluconate, and disulfide, or a combination of the three, and when the combination of the three is used, the effect of dispersing scale-forming ions is most excellent. Preferably, the scale inhibitor provided by the embodiment of the application comprises a combination of three of maleic acid disodium salt, gluconate and disulfide. When the three components are combined, the combination ratio can be 1:1: 2. The ratio of the three in the embodiment of the present application is not limited thereto.
In an alternative embodiment, the disodium maleate salt is 0.004 to 0.005 part by weight, the gluconate salt is 0.005 to 0.01 part by weight, and the disulfide is 0.004 to 0.006 part by weight.
For example, the disodium maleate salt may be present in an amount of 0.004 parts by weight or 0.005 parts by weight. The gluconate may be present in an amount of 0.005, 0.006, 0.007, 0.008, 0.009, 0.01 parts by weight, or the like. The weight parts of the bis-sulfide may be 0.004, 0.005, 0.006, etc.
In an alternative embodiment, the gluconate is potassium gluconate and/or sodium gluconate.
The gluconate can react with formed calcium carbonate and calcium sulfate scale to generate metal calcium ions so as to achieve the purpose of descaling. The gluconate can be a mixture of potassium gluconate and sodium gluconate, or potassium gluconate and sodium gluconate independently.
In an alternative embodiment, the detergent comprises hydrolyzed polymaleic anhydride and carboxyethylene diphosphonic acid.
The hydrolysis of polymaleic anhydride and carboxyethylidene diphosphonic acid can dissolve the formed calcium carbonate scale or calcium sulfate scale to achieve the purpose of descaling. Furthermore, the hydrolyzed polymaleic anhydride and the carboxyethylidene diphosphonic acid are ionized in water to generate anions which have certain surface activity and are adsorbed by the surface of scaling ions. The surface of the scaling ion adsorbs and hydrolyzes polymaleic anhydride and carboxyethylidene diphosphonic acid to form a double electric layer, so that the surface of the scale is charged, the coalescence among scale crystals is inhibited, and the scale prevention effect is achieved.
In an alternative embodiment, the hydrolyzed polymaleic anhydride is present in an amount of 0.005 to 0.01 parts by weight and the carboxyethylenediphosphonic acid is present in an amount of 0.01 to 0.02 parts by weight.
Illustratively, the hydrolyzed polymaleic anhydride is present in an amount of 0.005, 0.006, 0.007, 0.008, 0.009, 0.01 parts by weight, etc. The weight portions of the carboxyethylidene diphosphonic acid are 0.01 portion and 0.02 portion.
In an alternative embodiment, the dispersant is sodium dodecyl benzene sulfonate.
In an alternative embodiment, the sodium dodecylbenzenesulfonate is present in an amount of 0.15 to 0.4 parts by weight. Illustratively, it may be 0.15, 0.20, 0.3, 0.35, 0.4, etc.
In an optional embodiment, the scale inhibition and removal agent comprises the following components in parts by weight: 0.2-0.6 part of potassium chloride, 0.004-0.005 part of disodium maleate, 0.005-0.01 part of gluconate, 0.004-0.006 part of disulfide, 0.004-0.005 part of methylated monocyclic polyamine, 0.005-0.01 part of hydrolyzed polymaleic anhydride, 0.01-0.02 part of carboxyethylidene diphosphate, 0.15-0.4 part of sodium dodecyl benzene sulfonate and the balance of water.
As an example, the scale and scale inhibitor provided in the embodiments of the present application, on one hand, through dissociation of potassium chloride in water, positively charged potassium ions are generated, the potassium ions neutralize negative charges on clay, so as to avoid swelling of clay, and through reaction of anions generated after hydrolysis of disodium maleate, gluconate and dithioether in water with scale-forming metal ions and chelation with scale-forming cations, a stable ring structure is generated, as shown below:
the annular structure is adsorbed on the surface of the stratum, so that the contact of scaling ions and the stratum is avoided, the scaling ions are prevented from scaling and regenerating into precipitates, and the scale prevention effect is achieved. On the other hand, through the ionization of potassium chloride in water, the crystal lattice of the clay is changed, so that the normal structural state of the scaling surface is interfered, and the scaling of scaling ions is further inhibited. With the continuous growth of crystal lattice, the scaling ion is in saturation state or forms loose scale to be carried away by water flow; the other is an electrostatic repulsion mechanism, the scale inhibition and scale removal agent provided by the application is adsorbed on the surface which is already scaled, as shown in figure 1, the hydrolyzed polymaleic anhydride and the carboxyethylidene diphosphonic acid in the scale inhibition and scale removal agent provided by the application are ionized in water to generate anions, have certain surface activity and are adsorbed on the surface of the scale formation ions. The surface of the scaling ion adsorbs and hydrolyzes polymaleic anhydride and carboxyethylidene diphosphonic acid to form a double electric layer, so that the surface of the scale is charged, the coalescence among scale crystals is inhibited, and the scale prevention effect is achieved.
Through the scale inhibition and scale removal agent provided by the embodiment of the application, the scale removal effect is good and the scale removal rate is high through laboratory experiments. 1g of calcium carbonate scale is soaked in 200mL of oil layer protective solution in a laboratory, and the scale removal rate is more than or equal to 95 percent.
The system has short descaling time. 1g of calcium carbonate scale is soaked in 200mL of oil layer protective solution in a laboratory, and the descaling time is less than or equal to 8 h. When the scale-inhibiting and scale-removing agent is applied on site, only the scale-inhibiting and scale-removing agent provided by the embodiment of the application needs to be kept stand in a well shaft of a scale-forming well within 8 hours, and then the scale in the well shaft can be removed without delaying the normal operation progress of an operation team.
Compared with the common acidic descaling system, the system has neutral pH value and low corrosion rate. The pH value of the system measured in a laboratory is 6.8-7.0, the corrosion rate is less than or equal to 1mm/a and is far less than the corrosion rate of hydrochloric acid with the concentration of 15 percent, and the system has short standing time in a shaft and low corrosion rate, so that the system cannot cause serious corrosion to a tubular column.
The system has strong descaling capability and weak corrosivity on a pipe column, and can effectively remove and inhibit scale in an oil layer after entering a reservoir. Compared with descaling methods such as acidification and the like, the descaling method not only saves the operation cost and reduces the operation links, but also prolongs the production period of the oil well due to the descaling property.
On the other hand, the embodiment of the application provides a method for preparing the scale inhibiting and removing agent, which is used for preparing any one of the scale inhibiting and removing agents, and comprises the following steps:
according to the weight parts of the components, water, the anti-swelling agent and the scale inhibitor are sequentially added, then stirred for a reference time, and then the scale remover, the methylated single large cyclic polyamine and the dispersant are sequentially added, and stirred for 5-10 minutes to obtain the scale inhibiting and removing agent.
Furthermore, 98.271-98.944 parts of clear water is measured by a measuring cylinder to be used as base liquid, 0.2-0.6 part of potassium chloride is firstly added, 0.004-0.005 part of disodium maleate and 0.005-0.01 part of gluconate (potassium and sodium) are then added, the mixture is stirred for 10 minutes, then 0.004-0.006 part of dithioether, 0.004-0.005 part of methylated monocyclic polyamine, 0.005-0.01 part of hydrolyzed maleic anhydride, 0.01-0.02 part of carboxyethylene diphosphate and 0.15-0.4 part of sodium dodecyl benzene sulfonate are sequentially added, and the scale-inhibiting and descaling agent can be obtained after 5-10 minutes of stirring.
In the following alternative examples, those whose operations are not conditional are performed according to conventional conditions or conditions recommended by the manufacturer. The raw materials are conventional products which can be obtained commercially by manufacturers and specifications.
Example 1
98.271 parts of clear water is taken as a base solution by a measuring cylinder, 0.2 part of potassium chloride is firstly added, 0.004 part of disodium maleate and 0.005 part of potassium gluconate are then added, the mixture is stirred for 10 minutes, then 0.004 part of dimethyl sulfide, 0.004 part of methylated single large cyclic polyamine, 0.005 part of hydrolyzed polymaleic anhydride, 0.01 part of carboxyethylidene diphosphonic acid and 0.15 part of sodium dodecyl benzene sulfonate are sequentially added, and the mixture is stirred for 5 minutes to obtain the scale-inhibiting and descaling agent.
Example 2
98.271 parts of clear water is taken as a base solution by a measuring cylinder, 0.2 part of potassium chloride is firstly added, 0.004 part of disodium maleate and 0.006 part of potassium gluconate are then added, the mixture is stirred for 10 minutes, then 0.006 part of dithioether, 0.004 part of methylated monocyclic polyamine, 0.008 part of hydrolyzed polymaleic anhydride, 0.01 part of carboxyethylidene diphosphate and 0.2 part of sodium dodecyl benzene sulfonate are sequentially added, and the mixture is stirred for 6 minutes to obtain the scale and scale inhibitor.
Example 3
98.271 parts of clear water is taken as a base solution by a measuring cylinder, 0.2 part of potassium chloride is added, 0.005 part of disodium maleate and 0.007 part of potassium gluconate are added, the mixture is stirred for 10 minutes, then 0.006 part of dithioether, 0.004 part of methylated monocyclic polyamine, 0.007 part of hydrolyzed polymaleic anhydride, 0.01 part of carboxyethylidene diphosphonic acid and 0.3 part of sodium dodecyl benzene sulfonate are added in sequence, and the scale inhibitor and scale remover can be obtained after stirring for 5 minutes.
Example 4
98.271 parts of clear water is taken as a base solution by a measuring cylinder, 0.2 part of potassium chloride is firstly added, 0.005 part of disodium maleate and 0.008 part of potassium gluconate are then added, the mixture is stirred for 10 minutes, then 0.004 part of dithioether, 0.004 part of methylated monocyclic polyamine, 0.006 part of hydrolyzed polymaleic anhydride, 0.01 part of carboxyethylidene diphosphate and 0.35 part of sodium dodecyl benzene sulfonate are sequentially added, and the mixture is stirred for 10 minutes to obtain the scale and scale inhibitor.
Example 5
98.271 parts of clear water is taken as a base solution by a measuring cylinder, 0.2 part of potassium chloride is firstly added, 0.004 part of disodium maleate and 0.009 part of potassium gluconate are then added, the mixture is stirred for 10 minutes, then 0.005 part of dithioether, 0.004 part of methylated single large cyclic polyamine, 0.005 part of hydrolyzed polymaleic anhydride, 0.01 part of carboxyethylidene diphosphonic acid and 0.4 part of sodium dodecyl benzene sulfonate are sequentially added, and the mixture is stirred for 5 minutes to obtain the scale and scale inhibitor.
Example 6
98.271 parts of clear water is taken as a base solution by a measuring cylinder, 0.2 part of potassium chloride is firstly added, 0.005 part of disodium maleate and 0.01 part of potassium gluconate are then added, the mixture is stirred for 10 minutes, then 0.004 part of dithioether, 0.004 part of methylated single large cyclic polyamine, 0.009 part of hydrolyzed polymaleic anhydride, 0.01 part of carboxyethylidene diphosphonic acid and 0.35 part of sodium dodecyl benzene sulfonate are sequentially added, and the mixture is stirred for 10 minutes to obtain the scale and scale inhibitor.
Example 7
98.271 parts of clear water is taken as a base solution by a measuring cylinder, 0.2 part of potassium chloride is firstly added, 0.004 part of disodium maleate and 0.006 part of potassium gluconate are then added, the mixture is stirred for 10 minutes, then 0.005 part of dithioether, 0.004 part of methylated monocyclic polyamine, 0.008 part of hydrolyzed polymaleic anhydride, 0.01 part of carboxyethylidene diphosphate and 0.15 part of sodium dodecyl benzene sulfonate are sequentially added, and the mixture is stirred for 10 minutes to obtain the scale and scale inhibitor.
Example 8
98.271 parts of clear water is taken as a base solution by a measuring cylinder, 0.2 part of potassium chloride is firstly added, 0.005 part of disodium maleate and 0.007 part of potassium gluconate are then added, the mixture is stirred for 10 minutes, then 0.006 part of bis-sulfide, 0.004 part of methylated monocyclic polyamine, 0.006 part of hydrolyzed polymaleic anhydride, 0.01 part of carboxyethylidene diphosphonic acid and 0.15 part of sodium dodecyl benzene sulfonate are sequentially added, and the mixture is stirred for 5 minutes to obtain the scale-inhibiting and descaling agent.
Example 9
98.271 parts of clear water is taken as a base solution by a measuring cylinder, 0.2 part of potassium chloride is firstly added, 0.005 part of disodium maleate and 0.008 part of potassium gluconate are then added, the mixture is stirred for 10 minutes, then 0.004 part of dimethyl sulfide, 0.004 part of methylated single large cyclic polyamine, 0.007 part of hydrolyzed polymaleic anhydride, 0.01 part of carboxyethylidene diphosphonic acid and 0.35 part of sodium dodecyl benzene sulfonate are sequentially added, and the mixture is stirred for 5 minutes to obtain the scale and scale inhibitor.
Example 10
98.271 parts of clear water is taken as a base solution by a measuring cylinder, 0.2 part of potassium chloride is firstly added, 0.005 part of disodium maleate and 0.009 part of potassium gluconate are then added, the mixture is stirred for 10 minutes, then 0.005 part of dithioether, 0.004 part of methylated single large cyclic polyamine, 0.005 part of hydrolyzed polymaleic anhydride, 0.01 part of carboxyethylidene diphosphonic acid and 0.35 part of sodium dodecyl benzene sulfonate are sequentially added, and the mixture is stirred for 5 minutes to obtain the scale and scale inhibitor.
Example 11
98.271 parts of clear water is taken as a base solution by a measuring cylinder, 0.2 part of potassium chloride is firstly added, 0.004 part of disodium maleate and 0.01 part of potassium gluconate are then added, the mixture is stirred for 10 minutes, then 0.004 part of dithioether, 0.004 part of methylated monocyclic polyamine, 0.006 part of hydrolyzed polymaleic anhydride, 0.01 part of carboxyethylidene diphosphate and 0.4 part of sodium dodecyl benzene sulfonate are sequentially added, and the mixture is stirred for 10 minutes to obtain the scale and scale inhibitor.
Example 12
98.271 parts of clear water is taken as a base solution by a measuring cylinder, 0.2 part of potassium chloride is firstly added, 0.005 part of disodium maleate and 0.005 part of potassium gluconate are then added, the mixture is stirred for 10 minutes, then 0.004 part of dimethyl sulfide, 0.004 part of methylated single large cyclic polyamine, 0.005 part of hydrolyzed polymaleic anhydride, 0.01 part of carboxyethylidene diphosphonic acid and 0.2 part of sodium dodecyl benzene sulfonate are sequentially added, and the mixture is stirred for 10 minutes to obtain the scale and scale inhibitor.
The scale inhibition and scale removal agent provided by the embodiment of the application is tested through experiments.
Example 13, using 98.271 parts of clear water as an example in a laboratory, 0.2 part of potassium chloride, 0.004 part of disodium maleate and 0.005 part of potassium gluconate were added and stirred for 10 minutes, and then 0.004 part of dithioether, 0.004 part of methylated mono-and macrocyclic polyamine, 0.005 part of hydrolyzed polymaleic anhydride, 0.01 part of carboxyethylenediphosphonic acid and 0.15 part of sodium dodecylbenzenesulfonate were added in sequence and stirred for 5 minutes to prepare the scale and scale inhibitor. The pH was measured to be 7.0.
Experiments show that 1g of calcium carbonate is added into 200mL of the scale and scale inhibitor provided by the embodiment of the application, a large amount of bubbles are generated immediately, the bubbles disappear after 5 minutes, the oil layer protection solution is clear and transparent, no calcium carbonate precipitates, and the experimental data are shown in Table 1.
TABLE 1 Experimental results of corrosion rate of scale inhibiting and removing agent provided in the examples of the present application
| Sample name | Composite synergistic scale-removing and scale-inhibiting integrated oil layer protection liquid |
| pH value | 7.0 |
| Time of scale removal | 5min |
| Rate of scale removal | 99.7％ |
As can be seen from the table 1, the scale inhibition and scale removal agent provided by the embodiment of the application has short scale removal time, the scale removal rate is as high as 99.7%, and the scale removal rate is high.
In example 14 and the laboratory, using 98.157 parts of clear water as an example, 0.4 part of potassium chloride, 0.004 part of disodium maleate and 0.01 part of sodium gluconate are added and stirred for 10 minutes, then 0.005 part of dithioether, 0.004 part of methylated mono-macrocyclic polyamine, 0.007 part of hydrolyzed polymaleic anhydride, 0.015 part of carboxyethylidene diphosphate and 0.25 part of sodium dodecyl benzene sulfonate are sequentially added and stirred for 5 minutes, and the scale and scale inhibitor can be prepared.
It can be seen through experiments that two pieces of N80 steel were soaked in 300mL of oil layer protective solution and placed in a water bath at 90 ℃ for 72 hours, and the corrosion rate was calculated to be between 0.6 and 1.0, and the experimental data are shown in Table 2.
Table 2 corrosion rate test results of scale inhibiting and removing agent provided in the examples of the present application
| Hanging tablet number | Mass before corrosion | Quality after corrosion | Corrosion rate |
| 086 | 10.57 | 10.51 | 0.68 |
| 088 | 10.80 | 10.72 | 0.91 |
As can be seen from Table 2, the scale inhibition and scale removal agent provided by the embodiment of the application has low corrosivity to equipment and low corrosion rate, well protects the equipment, achieves the effect of scale inhibition and scale removal, and reduces the operation cost.
In example 15 and the laboratory, 98.944 parts of clear water is taken as an example, 0.6 part of potassium chloride, 0.005 part of disodium maleate and 0.01 part of potassium gluconate are added, stirred for 10 minutes, then 0.006 part of disulfide, 0.005 part of methylated mono-and macrocyclic polyamine, 0.01 part of hydrolyzed polymaleic anhydride, 0.02 part of carboxyethylene diphosphonic acid and 0.4 part of sodium dodecyl benzene sulfonate are sequentially added, and stirred for 5 minutes to prepare the scale and scale inhibitor. The pH was measured to be 6.9.
1g of calcium carbonate is added into 200mL of the scale inhibition and scale removal agent provided by the embodiment of the application, a large amount of bubbles are generated immediately, the bubbles disappear after 4 minutes, the oil layer protection solution is clear and transparent, no calcium carbonate is precipitated, and the experimental data are shown in Table 3.
TABLE 3 results of scale removal experiments with scale inhibiting and removing agents provided in the examples of the present application
| Sample name | Scale inhibitor and descaling agent |
| pH value | 6.9 |
| Time of scale removal | 4min |
| Rate of scale removal | 99.8％ |
As can be seen from Table 3, the scale inhibition and scale removal agent provided by the embodiment of the application has a neutral pH value, does not corrode equipment, and improves the operation efficiency in a scale removal time period, wherein the scale removal rate is as high as 99.8%, and the scale removal rate is high.
Two N80 steel sheets were immersed in 300mL oil layer protective solution and placed in a 90 ℃ water bath for 72 hours, and the corrosion rate was calculated to be between 0.6 and 0.8. The experimental data are shown in Table 4.
Table 4 corrosion rate test results of scale inhibiting and removing agent provided in the examples of the present application
| Hanging tablet number | Mass before corrosion | Quality after corrosion | Rate of corrosion |
| 059 | 11.06 | 10.99 | 0.73 |
| 091 | 11.02 | 10.95 | 0.76 |
As can be seen from Table 4, the scale and scale inhibitor provided by the embodiment of the application has small corrosion to metals, and the corrosion rate is less than 0.8.
All the above optional technical solutions may be combined arbitrarily to form optional embodiments of the present application, and are not described herein again.
The above description is only exemplary of the present application and should not be taken as limiting the scope of the present application, as any modifications, equivalents, improvements and the like that are within the spirit and principle of the present application should be included in the scope of the present application.
Claims (7)
1. The scale inhibiting and removing agent is characterized by comprising the following components in parts by weight: 0.2-0.6 part of anti-swelling agent, 0.013-0.021 part of antiscaling agent, 0.004-0.005 part of methylated mono-and large cyclic polyamine, 0.01-0.02 part of antiscaling agent, 0.15-0.4 part of dispersing agent and the balance of water;
the anti-swelling agent is potassium chloride;
the scale inhibitor comprises disodium maleate, gluconate and dithioether;
the scale remover comprises hydrolyzed polymaleic anhydride and carboxyethylidene diphosphonic acid.
2. The scale inhibiting and removing agent as claimed in claim 1, wherein the weight part of the disodium maleate salt is 0.004-0.005, the weight part of the gluconate salt is 0.005-0.01, and the weight part of the disulfide is 0.004-0.006.
3. The scale inhibiting and removing agent of claim 1, wherein the gluconate is potassium gluconate and/or sodium gluconate.
4. The scale inhibiting and removing agent as claimed in claim 1, wherein the hydrolyzed polymaleic anhydride is 0.005-0.01 weight part, and the carboxyethylidene diphosphonic acid is 0.01-0.02 weight part.
5. The scale inhibiting and removing agent of claim 1, wherein the dispersant is sodium dodecyl benzene sulfonate.
6. The scale inhibiting and removing agent as claimed in claim 5, wherein the weight portion of the sodium dodecyl benzene sulfonate is 0.15-0.4.
7. A method for preparing the scale inhibiting and descaling agent, which is used for preparing the scale inhibiting and descaling agent as claimed in any one of claims 1 to 6, and comprises the following steps:
according to the weight parts of the components, water, the anti-swelling agent and the scale inhibitor are sequentially added, then stirred for a reference time, and then the scale inhibitor, the methylated single-large cyclic polyamine and the dispersant are sequentially added, and stirred for 5-10 minutes to obtain the scale inhibiting and removing agent.
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| CN104046346A (en) * | 2013-03-13 | 2014-09-17 | 中国石油天然气股份有限公司 | Oil-field water injection well descaling agent and preparation method thereof |
| CN104726082A (en) * | 2015-03-27 | 2015-06-24 | 中国石油天然气集团公司 | Organic base scale removing agent applied to three-component compound flooding and preparation method of organic base scale removing agent |
| CN106145397A (en) * | 2016-08-04 | 2016-11-23 | 陕西森瑞石油技术开发有限公司 | A kind of oilfield injection water neutral corrosion inhibiting and descaling agent and preparation and application thereof |
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| FI126260B (en) * | 2013-05-20 | 2016-09-15 | Kemira Oyj | Antiscant mix and its use |
| CN106833580A (en) * | 2016-12-29 | 2017-06-13 | 中国石油天然气股份有限公司 | A kind of hyposmosis water injection well increasing injection scale preventative and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104046346A (en) * | 2013-03-13 | 2014-09-17 | 中国石油天然气股份有限公司 | Oil-field water injection well descaling agent and preparation method thereof |
| CN104726082A (en) * | 2015-03-27 | 2015-06-24 | 中国石油天然气集团公司 | Organic base scale removing agent applied to three-component compound flooding and preparation method of organic base scale removing agent |
| CN106145397A (en) * | 2016-08-04 | 2016-11-23 | 陕西森瑞石油技术开发有限公司 | A kind of oilfield injection water neutral corrosion inhibiting and descaling agent and preparation and application thereof |
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