CN114806529B - Scale dissolving cosolvent and preparation method thereof - Google Patents
Scale dissolving cosolvent and preparation method thereof Download PDFInfo
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- CN114806529B CN114806529B CN202210608706.0A CN202210608706A CN114806529B CN 114806529 B CN114806529 B CN 114806529B CN 202210608706 A CN202210608706 A CN 202210608706A CN 114806529 B CN114806529 B CN 114806529B
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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
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/54—Compositions for in situ inhibition of corrosion in boreholes or wells
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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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
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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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/602—Compositions for stimulating production by acting on the underground formation containing surfactants
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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
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/605—Compositions for stimulating production by acting on the underground formation containing biocides
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
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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
- C09K2208/32—Anticorrosion additives
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Abstract
The invention discloses a scale dissolving cosolvent which comprises organic salt, organic phenol, cationic surfactant and solvent water, wherein the mass ratio of each component is W (organic salt): w (organic phenol): w (cationic surfactant) = (2% -3%) (1% -1.5%) (0.5% -0.9%) and the balance solvent water. The invention has strong scavenging power, weak corrosiveness and strong universality, and can effectively achieve the purposes of increasing the production and the injection of the oil-water well.
Description
Technical Field
The invention belongs to the technical field of petroleum exploitation, and particularly relates to a scale-dissolving cosolvent and a preparation method thereof.
Background
Most of the oil fields in China enter the middle and later stages of development, and as water injection development is carried out for a long time, the oil wells of a plurality of oil fields, pumps and pipe columns of the water injection wells, a ground gathering and conveying system and stratum all have scaling with different degrees. The scale formation can corrode equipment pipelines, block the pipelines and stratum, increase water injection pressure, reduce exploitation efficiency and seriously affect normal production of oil fields.
The prior descaling technology mainly comprises a mechanical method, a physical method and a chemical method. The mechanical method is simple, low in cost and high in efficiency, but has the fatal defect that equipment is required to be disassembled for construction, which is not practical for many instruments. The physical method is to use physical means such as sound, light, electricity, ultrasonic wave, radiation and the like to achieve the aim of removing scale by changing the movement conditions of ions and molecules, and has the advantages of simple and convenient operation compared with mechanical scale removal, high cost and high energy consumption. Chemical means that water-insoluble scale is neutralized, oxidized, loosely dispersed or sequestered by adding a quantity of a chemical agent, so as to be dispersed and dissolved in an aqueous solution. The chemical descaling agent has various types, wide adaptability and convenient transportation, and has more obvious advantages in the field of oil fields.
The scale dissolving agent is divided into two parts: firstly, inorganic scale is dissolved, and secondly, the inorganic scale reacts with dissolved metal cations. To increase the solubility of inorganic scale, the dissolution rate is increased, according to the solubility product theory, mainly by heating and solubilization with auxiliary agents. The heating can accelerate the movement speed of ions and improve the dissolution speed, but the scaling phenomenon can be aggravated by the change of the thermal environment. Scaling can occur at the positions of stratum, shaft, pipeline and the like, and the blockage is mostly mixed by inorganic scale and organic scale, so that the scale-dissolving agent is difficult to permeate into the scale sample for dissolution, and the scale-dissolving effect cannot be achieved, so that a large amount of scale-dissolving agent is wasted, for example, slow waves are used for synthesizing low molecular weight potassium polyacrylate as a solubilization auxiliary agent in the text of barium sulfate strontium scale chemical scale remover research, a large amount of negatively charged ions can be ionized in water by the potassium polyacrylate, and the negatively charged ions are adsorbed on the surfaces of scale particles to form double layers, so that dissolution is accelerated; meanwhile, the potassium polyacrylate has certain chelating force and dispersibility and can soften scale. Gao Yang in the text of "the compounding of barium sulfate scale-dissolving agent and the analysis of scale-dissolving effect", sodium hydroxide is used as a solubilizer, and the chelation of the scale-forming cations by the scale-dissolving agent can be promoted under an alkaline environment, but excessive sodium hydroxide can saturate sodium ions in the solution, and the sodium ions can be combined with chelating groups to prevent the chelation of the scale-forming cations.
CN112094633a discloses a chelating type blocking remover, which is a multifunctional compound composition, wherein the weight percentage of the scale inhibitor is 5% -30%, the weight percentage of the scale inhibitor is polyaspartic acid is 0% -20%, the weight percentage of chelating agent iminodisuccinic acid is 5% -25%, the weight percentage of chelating agent ethylene diamine tetraacetic acid is 0% -5%, the weight percentage of the active synergist is polyquaternium-37 is 1% -5%, the weight percentage of the dispersant polyacrylamide is 1% -5%, and the balance is water. The adopted active synergist is polyquaternium-37, so that the oil-water interfacial tension can be effectively reduced, but the polyquaternium-37 is a hydrophilic polymer of high molecular weight aliphatic quaternium, and is not suitable for low permeability reservoirs.
CN113214813a discloses a chemical blocking remover for an oil-water well immobile pipe column, a preparation method and application thereof, wherein the chemical blocking remover for the oil-water well immobile pipe column comprises the following raw materials in percentage by mass: 15-30% of chelating dissolvent, 0.5-1.5% of penetrating solubilizing agent, 2.0-4.0% of antiscale stabilizer and 4.0-8.0% of viscosity-stabilizing discharge assistant, wherein the chelating dissolvent is one or more than two of 1,4,7, 10-tetraazacyclododecane-N-tetraacetic acid, ethylenediamine tetraacetic acid, 3-methyl-1,5,8,11-tetraazacyclotridecane-N-tetraacetic acid. The osmotic solubilizer is nonionic surfactant isomeric tridecanol polyoxyethylene ether phosphate and fatty alcohol polyoxyethylene ether, has higher stability, better water solubility, electrolyte resistance, easy biodegradation, small foam and environmental protection. However, nonionic surfactants are relatively sensitive to temperature and may precipitate after an increase in temperature.
Disclosure of Invention
The invention aims to provide a scale dissolving cosolvent which mainly aims at the field of oil extraction engineering of oil fields, so as to solve the problems of weak scavenging power, strong corrosiveness, poor universality and the like of the existing scale dissolving agent and achieve the purposes of increasing the production and injection of an oil-water well.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a scale-dissolving cosolvent comprises organic salt, organic phenol, cationic surfactant and solvent water, wherein the mass ratio of each component is W (organic salt): w (organic phenol): w (cationic surfactant) = (2% -3%) (1% -1.5%) (0.5% -0.9%) and the balance solvent water.
As a preferred embodiment, a chelating agent is also added, the mass ratio of each component being W (organic salt): w (organic phenol): w (cationic surfactant): w (chelating agent) = (2% -3%) (1% -1.5%) (0.5% -0.9%) (0.3% -0.5%) and the balance solvent water.
As a preferred embodiment, the organic salt is one or a combination of several of potassium benzoate, sodium p-toluenesulfonate, potassium hydrogen phthalate and sodium p-hydroxybenzoate.
As a preferred embodiment, the organic phenol is resorcinol.
As a preferred embodiment, the cationic surfactant is cetylpyridinium chloride (CPC) and/or dodecylpyridine chloride (DPC).
In a preferred embodiment, the chelating agent is tetrasodium ethylenediamine tetraacetate.
As a preferred embodiment, the solvent water is industrial water.
As a preferred embodiment, W (organic salt): w (organic phenol): w (cationic surfactant): w (chelating agent) = (2.2-2.8%) (1-1.3%) (0.6-0.8%) (0.4% and the balance solvent water.
As another object of the invention, the invention also provides a preparation method of the scale dissolving cosolvent, which comprises the following steps: and respectively weighing the organic salt, the organic phenol, the cationic surfactant and the solvent water according to the weight ratio, placing the mixture in a container, and fully and uniformly stirring the mixture at room temperature to obtain the scale dissolving cosolvent.
As another object of the present invention, the present invention also provides a method for scale dissolution using the above-mentioned scale dissolution co-solvent, comprising the steps of: and (3) injecting the prepared scale-dissolving agent into the oil well on line, wherein the injection amount is defined as the maximum discharge capacity under the injection pressure, and then closing the well for 48-72 hours to obtain the detergent.
Compared with the prior art, the invention has the following beneficial effects:
the molecular vibration of benzoic acid in the scale dissolving cosolvent is strong, the activity is high, the movement speed of ions can be accelerated at normal temperature, the dissolution speed of calcium carbonate and calcium sulfate is increased, meanwhile, because sodium benzoate, resorcinol and the like with benzene rings are electron donating groups, positive ions are lost, electronegativity is enhanced, and the action of formate negative potential is cooperated, physical and chemical adsorption is easy to occur with positively charged metal cations, and the dissolution capacity is enhanced. The cationic activator containing heterocycle has strong oil washing capability and good temperature resistance, and has bactericidal effect on iron bacteria and sulfate reducing bacteria; and because the surfactant contains pyridine rings, the corrosion inhibition effect on metals can be achieved, the reaction of chelating agents and iron ions is reduced, and the scale dissolution rate is improved. The invention is compounded with chelating agent under normal temperature through the synergistic effect between the medicaments, the scale dissolution rate of calcium sulfate after 1h is 98.7%, the scale dissolution rate of calcium carbonate after 24h is 62.5%, and meanwhile, the cosolvent has low corrosion rate, strong universality and simple preparation method.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Sequentially adding 2% of organic salt potassium benzoate, 1% of organic phenol resorcinol, 0.5% of cationic surfactant chlorohexadecylpyridine and 4% of chelating agent ethylene diamine tetraacetic acid tetrasodium salt and the balance of water into a container, mixing the components, fully stirring at room temperature to obtain 50g of scale-dissolving liquid, wherein the pH value of the solution is 10, respectively adding 1g of calcium carbonate and calcium sulfate into conical bottles respectively filled with 50mL of scale-dissolving agent, and fully stirring. After the reaction for 1h at normal temperature, the scale dissolution rate of calcium sulfate reaches 98.7%, and after the reaction for 24h, the scale dissolution rate of calcium carbonate is 67.5%.
Example 2
Sequentially adding 2.5% of organic salt sodium p-toluenesulfonate, 1.5% of organic phenol resorcinol, 0.5% of cationic surfactant chlorododecyl pyridine, 4% of chelating agent ethylene diamine tetraacetic acid and the balance of water into a container, mixing the components, fully stirring at room temperature to obtain 50g of scale-dissolving liquid, wherein the pH value of the solution is 10.5, respectively adding 1g of calcium carbonate and calcium sulfate into conical flasks respectively filled with 50mL of scale-dissolving agent, and fully stirring. After the reaction for 1h at normal temperature, the scale dissolution rate of calcium sulfate reaches 95.1%, and after the reaction for 24h, the scale dissolution rate of calcium carbonate is 63.2%.
Example 3
Sequentially adding 3% of organic salt sodium benzoate, 1.2% of organic phenol resorcinol, 0.9% of cationic surfactant chlorododecyl pyridine and 4% of chelating agent ethylene diamine tetraacetic acid tetrasodium salt and the balance of water into a container, mixing the components, fully stirring at room temperature to obtain 50g of scale-dissolving liquid, wherein the pH value of the solution is 10.5, respectively adding 1g of calcium carbonate and calcium sulfate into conical bottles respectively filled with 50mL of scale-dissolving agent, and fully stirring. After the reaction for 1h at normal temperature, the scale dissolution rate of calcium sulfate reaches 98.1%, and after the reaction for 24h, the scale dissolution rate of calcium carbonate is 63.8%.
Example 4
The dissolution agents of examples 1-3 were each tested for corrosion rate by the hanging piece vector method with reference to standard SY/T5273-2000, and N80 hanging pieces were placed in the dissolution agent at 80℃for 7 days, see Table 1, with uniform corrosion rates for both dissolution agents being lower than the standard corrosion rates.
TABLE 1 evaluation of corrosion by three detergents
Example 5
Aiming at a CF43 water well, the oil pressure of the well before the measure is 22MPa, and the daily injection allocation is 30m 3 Daily note of 18m 3 The water quality and scale sample of the well are tested and analyzed to find that the water quality and scale sample is mainly barium sulfate scale and a small amount of calcium carbonate, and the scale-dissolving agent of the example 1 is prepared by 30m 3 On-line injection, closing reaction for 72 hours, and comparing after measures to find that the oil pressure of the well is reduced to 5MPa and daily injection reaches 30m 3 Meets the injection allocation requirement, and the oil pressure is 9.8MPa and the daily injection is 30m 6 months after the measures 3 The injection increasing effect is obvious.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The scale dissolving cosolvent is characterized by comprising organic salt, organic phenol, cationic surfactant, chelating agent and solvent water, wherein the mass ratio of the components is W (organic salt): w (organic phenol): w (cationic surfactant): w (chelating agent) = (2% -3%) (1% -1.5%) (0.5% -0.9%) (0.3% -0.5%) and the balance solvent water;
the organic salt is one or the combination of more of potassium benzoate, sodium p-toluenesulfonate, potassium hydrogen phthalate and sodium p-hydroxy benzoate;
the organic phenol is resorcinol;
the cationic surfactant is cetylpyridinium chloride and/or dodecylpyridine chloride;
the chelating agent is tetrasodium ethylenediamine tetraacetate.
2. A scale-dissolving co-solvent according to claim 1, wherein the solvent water is industrial water.
3. A scale-dissolving co-solvent according to claim 1, wherein W (organic salt): w (organic phenol): w (cationic surfactant): w (chelating agent) = (2.2-2.8%) (1-1.3%) (0.6-0.8%) (0.4% and the balance solvent water.
4. A method for preparing a scale-dissolving co-solvent according to any one of claims 1 to 3, comprising the steps of: and respectively weighing the organic salt, the organic phenol, the cationic surfactant, the chelating agent and the solvent water according to the weight ratio, placing the mixture in a container, and fully and uniformly stirring the mixture at room temperature to obtain the scale dissolving cosolvent.
5. A method of scale dissolution using the scale dissolution co-solvent according to any one of claims 1 to 3, comprising the steps of: and (3) injecting the prepared scale-dissolving agent into the oil well on line, wherein the injection amount is defined as the maximum discharge capacity under the injection pressure, and then closing the well for 48-72 hours to obtain the detergent.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106867490A (en) * | 2017-01-18 | 2017-06-20 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | A kind of chelating de-plugging agent suitable for complicated fouling reservoir and preparation method thereof |
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| US5151196A (en) * | 1991-09-27 | 1992-09-29 | Mobil Oil Corporation | Method for regenerating scale solvent |
| CA2369954A1 (en) * | 1999-05-03 | 2000-11-09 | Kim A. Whitaker | Method and composition for inhibiting corrosion in aqueous systems |
| CN105754567B (en) * | 2014-12-17 | 2018-08-14 | 中国石油天然气股份有限公司 | A kind of water injection well scale remover and its preparation method and application |
| CN114426823B (en) * | 2021-12-30 | 2022-12-30 | 中国石油化工股份有限公司 | Oil field insoluble scale dispersing solubilizer and preparation method thereof |
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| CN106867490A (en) * | 2017-01-18 | 2017-06-20 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | A kind of chelating de-plugging agent suitable for complicated fouling reservoir and preparation method thereof |
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