CN114426823A - Oil field insoluble scale dispersing solubilizer and preparation method thereof - Google Patents
Oil field insoluble scale dispersing solubilizer and preparation method thereof Download PDFInfo
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- CN114426823A CN114426823A CN202111654657.6A CN202111654657A CN114426823A CN 114426823 A CN114426823 A CN 114426823A CN 202111654657 A CN202111654657 A CN 202111654657A CN 114426823 A CN114426823 A CN 114426823A
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- 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
Abstract
The invention discloses a preparation method of an oil field insoluble scale dispersing solubilizer, which comprises a pyridine compound and a pyridine-N-oxide compound in a mass ratio of: w (pyridines): w (pyridine-N-oxide compounds) (80-85) (15-20) is used in combination with a chelating agent commonly used in oil fields, and the temperature is higher than 30 ℃, so that the scale dissolution rate of insoluble scales such as calcium sulfate, strontium sulfate, barium sulfate and the like is not lower than 81%, and the scale dissolution performance is improved.
Description
Technical Field
The invention belongs to the technical field of oil extraction engineering in the petroleum industry, and particularly relates to an oil field insoluble scale dispersing solubilizer and a preparation method thereof.
Background
Scaling problems are prevalent in oil and gas production, water injection, and drainage processes. Formation water or reinjection water often contains a certain amount of Ca2+、Mg2+、Ba2+、Sr2+Iso-cation, and a certain amount of CO3 2-、SO4 2-The anions cause scaling due to the change of thermodynamic factors such as temperature and pressure, the change of kinetic factors such as flow rate and flow form, the compatibility between the reinjection water and the formation water and the like, thereby reducing the exploitation efficiencyEven the oil and gas well is stopped producing and scrapped; in addition, the scaling and corrosion of the pipeline also easily cause the problems of perforation and the like, so that the scale removal and prevention are one of the problems faced by the petroleum industry. Calcium sulfate, barium sulfate, strontium sulfate and other insoluble scales are poor in cleaning effect of a common scale remover, and normal production of an oil field is seriously affected.
Anionic polymers containing carboxyl functional groups are a common class of scale and scale inhibitors. These polymers are usually homopolymers or modified copolymers of acrylic acid, maleic acid. On one hand, functional groups such as carboxyl and the like in the polymer can generate chelation with high-valence metal ions, so that the solubility is increased; on the other hand, polymers may also change the lattice, creating lattice deformities that result in difficult or softened crystals. In addition, the polymer can also be adsorbed on the surface of the scale particles, making the scale particles more easily dispersed.
In China, a plurality of research results on chelation, dissolution and scale dissolution have been achieved, and in 2012, leap and the like synthesize an alkaline scale dissolving agent aiming at the scaling problem of Changqing oil field Chang2 oil reservoir. Experiments show that the scale dissolving agent has good scale dissolving effect on sulfate scale. In 2014, a slow sulfate blocking remover (YHJD-1) is researched in Changqing oil fields, mainly comprises a plurality of chelating agents, cosolvents, surfactants, synergists, bactericides and other components, has very good solubility on oil field calcium scale and sulfate scale, can convert solid insoluble scale into a water-soluble solution, and reduces the scale formation on the inner walls of stratum pores and gathering and transportation pipelines. Lijiabo et al synthesizes a tetrapolymer by using 2-acrylamide-2-methylpropanesulfonic Acid (AMPS), Vinyl Acetate (VAC) and the like as monomers, and compounds the tetrapolymer with citric acid, tartaric acid and ammonia complexing agent to form the scale remover. 1g of the built detergent can dissolve 0.61g of CaSO 4. It is proposed by Hongjiang et al that carboxylic acid compounds containing conjugated double bonds, carboxylic acid polymer conversion agents and surfactants can increase the scale dissolution rate of DTPA to BaSO 4. The barium sulfate descaling rate was found to be 89.01%, and the core permeability recovery rate was found to be 94.67%. Yuan-Yan orchid and the like synthesize a novel compound scale remover which takes a P (AMPS-AA) binary copolymer as an auxiliary agent and an EDTA/DTPA mixture as a main agent and is used for BaSO4The descaling capacity of the water-based oil reaches 17.4g/L after 8 hours.
The chelating descaling mechanism is researched systematically by influence of the molecular structure, basic physicochemical properties and environmental factors of the chelating agent on the scale dissolving effect, and when some chelating agents dissolve sulfate scales, the chelating agent has better using effect by matching with a catalyst, such as oxalic acid, fluoride, formate and the like, and has promotion effect on the chelating dissolution of EDTA, DTPA and sulfate. The current trend is to develop a scale dissolver with high scale removal rate and high scale dissolution rate.
In the text of synthesis of polycarboxylic acid macromolecular surfactant and application thereof in mold gypsum in 2014, which is equivalent to Maoyou and Huichi, polycarboxylic acid macromolecules have certain surface activity, and when the concentration is 3.0 percent at 30 ℃, the surface tension of a polycarboxylic acid macromolecular solution is 53.6mN/m, so that the surface tension reducing capability is weaker. The polycarboxylic acid macromolecules have the capability of increasing the polymerization solubility of calcium sulfate, and when the parameter is 20% at 40 ℃, the solubility of the calcium sulfate is increased from 0.25% of the solubility of blank gypsum to 0.47%, and the absolute value of the increase of the solubility is small.
Chinese patent application CN201110315256.8 discloses a carbonate scale remover for oil-water wells, wherein the scale removal synergist is potassium fluoride, sodium oxalate or ammonium persulfate. The oil washing agent is beneficial to peeling of the dirt, but is easy to adsorb, and has no obvious effect on peeling of the dirt. The descaling synergist is potassium fluoride, sodium oxalate or ammonium persulfate. Potassium fluoride and sodium oxalate have certain solubilization effect, but are easy to generate precipitates.
The Chinese patent application CN202110137541.9 discloses a barium sulfate scale dissolver, wherein the solubilizer comprises sodium formate and sodium hydroxide. Sodium formate is poorly solubilised on calcium carbonate, which is converted to calcium hydroxide by sodium hydroxide, increasing solubility, but at pH values greater than 11.
Disclosure of Invention
The invention mainly aims to provide an oil field insoluble scale dispersing solubilizer and a preparation method thereof, which utilizes the strong electronegativity, high activity and strong polarity of a compound containing pyridine rings and pyridine-N-oxide compounds in a molecular structure to be matched with a common chelating agent to disperse and solubilize insoluble scales such as barium sulfate, strontium sulfate, calcium sulfate and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
an oil field insoluble scale dispersing solubilizer is prepared by compounding a pyridine compound and a pyridine-N-oxide compound, wherein the mass ratio of the pyridine compound to the pyridine-N-oxide compound is (80-85) to (15-20).
Further, the mass ratio of the pyridine compound to the pyridine-N-oxide compound is 4: 1.
Further, the pyridine compounds include: 5-ethyl-2-methylpyridine, 3-ethylpyridine, 2-ethylpyridine, 3-methylpyridine, 2-hydroxy-6-methylpyridine and 3-amino-2-methylpyridine.
Further, the pyridine-N-oxide based compound includes: 2, 3-lutidine-N-oxide, 3, 5-lutidine-N-oxide, 2-methylpyridine-N-oxide and 3-methylpyridine-N-oxide.
As another object of the invention, the invention also provides a preparation method of the oil field insoluble scale dispersing solubilizer, which comprises the following steps: sequentially adding a pyridine compound and a pyridine-N-oxide compound into a container, wherein the mass ratio of the pyridine compound to the pyridine-N-oxide compound is as follows: w (pyridines): and (5) continuously stirring W (pyridine-N-oxide compounds) (80-85) (15-20) at the room temperature at the rotating speed of 100-120 r/min for 50-70 minutes to obtain the compound.
As another object of the invention, the invention also provides an oil field insoluble scale dispersion and increase solution which comprises the following components: 1-2 wt% of oil field insoluble scale dispersing solubilizer, 5-6 wt% of ethylene diamine tetraacetic acid tetrasodium salt, 1-2 wt% of tetrakis hydroxymethyl phosphonium sulfate and the balance of water.
Further, the component is preferably: 1.5 wt% of oilfield insoluble scale dispersion solubilizer, 5.5 wt% of ethylenediamine tetraacetic acid tetrasodium salt, 1.5 wt% of tetramethylolphosphate sulfate, and the balance of water.
The nitrogen atom of the pyridine ring has strong electronegativity, and has strong repulsion action on scales such as calcium sulfate, barium sulfate and the like, so that the scales are stripped, dispersed and solubilized. The compound containing pyridine ring or pyridine-N-oxide has strong polarity and strong molecular vibration capability at normal temperature, and increases the scale dissolving speed of the scale dissolving agent at normal temperature. The pyridine-N-oxide compounds have higher activity, lower molecular weight and easy penetration; and because the solubilizer contains pyridine rings, the solubilizer has good wettability to crude oil and strong oil washing capability, so that the chelating agent is more easily contacted with the surface of scale, and the on-site actual scale sample scale dissolving speed is increased.
The oil field insoluble scale dispersing solubilizer prepared by the invention is used together with a chelating agent commonly used in oil fields, and when the temperature is higher than 30 ℃, the insoluble scale dissolving rate of calcium sulfate, strontium sulfate, barium sulfate and the like is not lower than 81 percent, and the scale dissolving performance is improved.
Detailed Description
The present invention is described in detail with reference to the following embodiments, which should be understood as being illustrative only and not limiting, and any modifications, equivalents, etc. based on the present invention are within the scope of the present invention.
Example 1
Adding a proper amount of 3-ethylpyridine and 3-methylpyridine-N-oxide into a container in sequence, wherein the mass ratio of the 3-ethylpyridine to the N-methylpyridine-N-oxide is as follows: w (3-ethylpyridine): w (3-methylpyridine-N-oxide) ═ 80: 20. Stirring continuously at room temperature at the rotating speed of 110 r/min for 60 min to obtain the oil field insoluble scale dispersing solubilizer.
100g of the oil field insoluble scale dispersing and solubilizing solution is prepared by 1.5 percent of the oil field insoluble scale dispersing and solubilizing agent, 5.5 percent of the ethylene diamine tetraacetic acid tetrasodium salt, 1.5 percent of the tetrakis (hydroxymethyl) phosphonium sulfate and the balance of water, 1g of calcium sulfate powder is added into the oil field insoluble scale dispersing and solubilizing solution, and the scale dissolving rate is 95 percent at 30 ℃ for 1 hour.
Example 2
Adding a proper amount of 3-methylpyridine and 2, 3-dimethylpyridine-N-oxide into a container in sequence, wherein the mass ratio of the 3-methylpyridine to the 2, 3-dimethylpyridine-N-oxide is as follows: w (3-methylpyridine): w (2, 3-lutidine-N-oxide) 85: 15. Stirring continuously at room temperature at the rotating speed of 110 r/min for 60 min to obtain the oil field insoluble scale dispersing solubilizer.
100g of the oilfield insoluble scale dispersing and solubilizing solution is prepared by 1.5% of the oilfield insoluble scale dispersing and solubilizing agent, 5.5% of ethylene diamine tetraacetic acid tetrasodium salt, 1.5% of tetrakis hydroxymethyl phosphonium sulfate and the balance of water, 1g of strontium sulfate powder is added, and the scale dissolution rate is 90% after 72 hours at the temperature of 60 ℃.
Example 3
Sequentially adding a proper amount of 2-hydroxy-6-methylpyridine and 2-methylpyridine-N-oxide into a container, wherein the mass ratio of the 2-hydroxy-6-methylpyridine to the 2-methylpyridine-N-oxide is as follows: w (2-hydroxy-6-methylpyridine): w (2-methylpyridine-N-oxide) ═ 83: 17. Stirring continuously at room temperature at the rotating speed of 110 r/min for 60 min to obtain the oil field insoluble scale dispersing solubilizer.
100g of the oilfield indissolvable dirt dispersion solubilizer is prepared from 1.5 percent of the oilfield indissolvable dirt dispersion solubilizer, 5.5 percent of ethylenediaminetetraacetic acid tetrasodium salt, 1.5 percent of tetramethylolphosphate sulfate and the balance of water, 1g of barium sulfate powder is added into the oilfield indissolvable dirt dispersion solubilizer, and the dirt dissolution rate of 72 hours at the temperature of 60 ℃ is 82 percent.
Example 4
Adding a proper amount of 2-ethylpyridine and 3, 5-dimethylpyridine-N-oxide into a container in sequence, wherein the mass ratio of the 2-ethylpyridine to the 3, 5-dimethylpyridine-N-oxide is as follows: w (2-ethylpyridine): w (3, 5-lutidine-N-oxide) ═ 80: 20. Stirring continuously at room temperature at the rotating speed of 110 r/min for 60 min to obtain the oil field insoluble scale dispersing solubilizer.
100g of the oilfield indissolvable dirt dispersion solubilizer with the mass concentration of 1.5 percent, 5.5 percent of ethylenediaminetetraacetic acid tetrasodium salt, 1.5 percent of tetramethylolphosphate and the balance of water are prepared into 100g of oilfield indissolvable dirt dispersion solution, 1g of calcium carbonate powder is added into the oilfield indissolvable dirt dispersion solubilizer, and the dirt dissolution rate is 60 percent at 60 ℃ for 72 hours.
Example 5
100g of the oil field insoluble scale dispersing and increasing solution prepared in the example 4 is added with 1g of HQ oil field well screen pipe mixed scale sample, and the main components of the scale sample comprise 40% of calcium carbonate, 15% of calcium sulfate, 12% of sulfur iron compound, 13% of colloid asphaltene and other impurities. After 72 hours at the temperature of 60 ℃, colloidal asphaltene in the scale sample is dispersed in the solution, most of the scale sample is dispersed in the solution, a small amount of small particles are present at the bottom of the bottle, solid particles at the bottom of the bottle are filtered out and weighed, and the dissolution rate of the mixed scale sample is calculated to be 81%.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (7)
1. The oil field insoluble scale dispersing solubilizer is characterized by being prepared by compounding a pyridine compound and a pyridine-N-oxide compound, wherein the mass ratio of the pyridine compound to the pyridine-N-oxide compound is (80-85) to (15-20).
2. The oilfield insoluble scale dispersing and solubilizing agent according to claim 1, wherein the mass ratio of the pyridine compound to the pyridine-N-oxide compound is preferably 4: 1.
3. The oilfield poorly soluble scale dispersing and solubilizing agent of claim 1, wherein the pyridine compound comprises: 5-ethyl-2-methylpyridine, 3-ethylpyridine, 2-ethylpyridine, 3-methylpyridine, 2-hydroxy-6-methylpyridine and 3-amino-2-methylpyridine.
4. The oilfield poorly soluble scale dispersing and solubilizing agent of claim 1, wherein the pyridine-N-oxide based compound comprises: 2, 3-lutidine-N-oxide, 3, 5-lutidine-N-oxide, 2-methylpyridine-N-oxide and 3-methylpyridine-N-oxide.
5. The preparation method of the oil field insoluble scale dispersing and solubilizing agent of any one of claims 1 to 4, which comprises the following steps: sequentially adding a pyridine compound and a pyridine-N-oxide compound into a container, wherein the mass ratio of the pyridine compound to the pyridine-N-oxide compound is as follows: w (pyridines): and (5) continuously stirring W (pyridine-N-oxide compounds) (80-85) (15-20) at the room temperature at the rotating speed of 100-120 r/min for 50-70 minutes to obtain the compound.
6. An oil field insoluble scale dispersion solubilization solution is characterized by comprising the following components: 1-2 wt% of the oil field insoluble scale dispersing solubilizer as defined in any one of claims 1-4, 5-6 wt% of tetrasodium ethylenediamine tetraacetate, 1-2 wt% of tetramethylolphosphosulfate, and the balance of water.
7. The oilfield poorly soluble scale dispersing and solubilizing solution as claimed in claim 6, wherein the components are preferably: 1.5 wt% of oil field insoluble scale dispersing solubilizer, 5.5 wt% of ethylene diamine tetraacetic acid tetrasodium salt, 1.5 wt% of tetrakis hydroxymethyl phosphonium sulfate and the balance of water.
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| CN114806529A (en) * | 2022-05-31 | 2022-07-29 | 中国石油化工股份有限公司 | Scale-dissolving cosolvent and preparation method thereof |
| CN117384611A (en) * | 2023-12-13 | 2024-01-12 | 东营煜煌能源技术有限公司 | Solid descaling blocking remover and preparation method thereof |
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| CN117384611B (en) * | 2023-12-13 | 2024-02-13 | 东营煜煌能源技术有限公司 | Solid descaling blocking remover and preparation method thereof |
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