CN117925208A - Application of betaine in hydrate inhibitor and hydrate inhibition method - Google Patents
Application of betaine in hydrate inhibitor and hydrate inhibition method Download PDFInfo
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- CN117925208A CN117925208A CN202211314136.0A CN202211314136A CN117925208A CN 117925208 A CN117925208 A CN 117925208A CN 202211314136 A CN202211314136 A CN 202211314136A CN 117925208 A CN117925208 A CN 117925208A
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- KWIUHFFTVRNATP-UHFFFAOYSA-N Betaine Natural products C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 239000003112 inhibitor Substances 0.000 title claims abstract description 85
- 229960003237 betaine Drugs 0.000 title claims abstract description 45
- 230000005764 inhibitory process Effects 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 38
- KWIUHFFTVRNATP-UHFFFAOYSA-O N,N,N-trimethylglycinium Chemical compound C[N+](C)(C)CC(O)=O KWIUHFFTVRNATP-UHFFFAOYSA-O 0.000 title abstract 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 28
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 27
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 13
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 10
- 150000003839 salts Chemical class 0.000 claims description 8
- 229920003169 water-soluble polymer Polymers 0.000 claims description 8
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 claims description 6
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 6
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 6
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 6
- 235000010333 potassium nitrate Nutrition 0.000 claims description 6
- 239000004323 potassium nitrate Substances 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 230000002401 inhibitory effect Effects 0.000 claims description 3
- 229910017053 inorganic salt Inorganic materials 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 13
- 230000015556 catabolic process Effects 0.000 abstract description 3
- 238000006731 degradation reaction Methods 0.000 abstract description 3
- 231100000053 low toxicity Toxicity 0.000 abstract description 3
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- 238000006243 chemical reaction Methods 0.000 description 24
- 239000007789 gas Substances 0.000 description 21
- 239000000243 solution Substances 0.000 description 17
- 238000012360 testing method Methods 0.000 description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000013078 crystal Substances 0.000 description 7
- 239000008367 deionised water Substances 0.000 description 7
- 229910021641 deionized water Inorganic materials 0.000 description 7
- 238000001514 detection method Methods 0.000 description 7
- 150000001413 amino acids Chemical class 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
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- 150000004677 hydrates Chemical class 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000012985 polymerization agent Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 238000003760 magnetic stirring Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- JWYVGKFDLWWQJX-UHFFFAOYSA-N 1-ethenylazepan-2-one Chemical compound C=CN1CCCCCC1=O JWYVGKFDLWWQJX-UHFFFAOYSA-N 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- 239000004471 Glycine Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
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- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- -1 methane hydrate Chemical compound 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention provides an application of betaine in a hydrate inhibitor and a hydrate inhibition method, and belongs to the technical field of oil gas production. The hydrate inhibitor of the present invention includes betaine; the hydrate inhibition method comprises the step of adopting the hydrate inhibitor to inhibit the generation of hydrate in a system, wherein the system is an oil-water system, a gas-water system or an oil-water gas system. The hydrate inhibitor has the advantages of low toxicity, no volatilization, easy degradation, environmental friendliness and the like, can greatly improve the balance condition of hydrate generation, and has good thermodynamic inhibition effect.
Description
Technical Field
The invention belongs to the field of oil gas production, and particularly relates to application of betaine in a hydrate inhibitor and a hydrate inhibition method.
Background
Some low molecular weight gases and some volatile liquids, such as C1-C4 light hydrocarbons, N 2、O2、CO2、H2 S, ethylene oxide, tetrahydrofuran, halogenated alkanes and the like, can form non-stoichiometric cage-shaped crystals with water under certain temperature and pressure conditions, and are commonly called cage-shaped hydrate (CLATHRATE HYDRATES) for short, and the structural types of the low molecular weight gases and the volatile liquids are mainly three types of I type, II type and H type. Pipeline blockage caused by gas hydrate generation has long been a troublesome problem for the oil and gas production and transportation sector; in particular, the problem of hydrates is particularly pronounced for the development of offshore oil and gas fields and for the deep sea transportation of oil and gas, mainly because both the water temperature and pressure conditions at the sea floor are well suited for the formation of hydrates. Therefore, how to prevent the generation of hydrate is always concerned by the petroleum and natural gas industry, and is also a difficult problem that needs to be broken through in the industry.
Hydrate inhibition methods are of two types, traditional thermodynamic inhibition methods and novel kinetic control methods. The thermodynamic inhibition method is characterized in that the thermodynamic inhibition method is widely applied at present by dehydrating, heating, decompressing and adding thermodynamic inhibitors to ensure that the system does not have thermodynamic conditions for generating hydrate. Conventional thermodynamic inhibition methods typically avoid hydrate formation by adding a sufficient amount of thermodynamic inhibitors (e.g., methanol, ethanol, ethylene glycol, triethylene glycol, etc.) to bring the equilibrium formation pressure of the hydrate above or below the operating pressure of the pipeline. However, this method is limited by the problems of large amount of thermodynamic inhibitors represented by methanol and ethylene glycol (the amount used is usually 40 to 60wt% based on the mass of water in the system), high cost, difficult recovery, and the like. In particular, methanol is gradually eliminated due to the defects of high toxicity, high volatility, high pollution and the like, and electrolyte salts represented by sodium chloride can be only applied in a limited range due to the problems of pipeline corrosion and the like.
Kinetic control methods have evolved from kinetic inhibition methods, including both kinetic inhibition and dynamic control. The kinetic inhibition method is to add a low dose of hydrate inhibitor, which does not change the thermodynamic conditions of hydrate formation, but rather achieves the purpose of preventing and controlling the hydrate by changing the kinetic conditions of hydrate formation, such as delaying the nucleation of the hydrate, slowing down the growth rate of hydrate crystals, preventing the hydrate crystals from aggregating into blocks, and the like. Low dose hydrate inhibitors include hydrate kinetic inhibitors and anti-agglomerants; the dynamics inhibitor is mainly applicable to a gas-water two-phase system, has the defects of low inhibition activity, common use under supercooling degree conditions, easy failure at the temperature exceeding 10 ℃ and the like, and particularly has poor biodegradability, so that the dynamics inhibitor represented by poly-N-vinylcaprolactam is limited to be used in many offshore oil fields; the anti-polymerization agent only can play a role when the oil phase exists, and once the water content in the system exceeds 50wt%, the anti-polymerization effect can be disabled, and in addition, the anti-polymerization agent has the problems of high synthesis cost, high toxicity and the like, so that the use of the anti-polymerization agent is gradually limited.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the application of betaine in the hydrate inhibitor and a hydrate inhibition method, and the hydrate inhibitor containing the betaine has the advantages of low toxicity, non-volatility, easy degradation, environmental friendliness and the like, can greatly improve the balance condition of hydrate generation, and has good thermodynamic inhibition effect.
According to one aspect of the present invention there is provided the use of betaine as a component of a hydrate inhibitor in inhibiting hydrate formation in a system.
Optionally, the hydrate inhibitor further comprises an inhibitor M; the inhibitor M is at least one selected from soluble alcohol, water soluble salt and water soluble polymer, preferably soluble alcohol.
Optionally, the system is an oil-water system, a gas-water system or an oil-water gas system.
Optionally, the mass ratio of the betaine to the inhibitor M is 1:0-1:3.
Optionally, the soluble alcohol is at least one selected from methanol and ethylene glycol, preferably ethylene glycol.
Alternatively, the water-soluble salt is selected from at least one of sodium chloride and potassium nitrate, preferably potassium nitrate.
Optionally, the water-soluble polymer is at least one selected from polyvinylpyrrolidone and polyvinylcaprolactam, preferably polyvinylpyrrolidone.
In the invention, the CAS registry number of the betaine is 107-43-7, and the betaine has the following structure:
。
In the present invention, the hydrate inhibitor may be betaine alone; in this case, betaine acts directly as a hydrate inhibitor.
Furthermore, the hydrate inhibitor of the present invention may also be a mixture of betaine and other conventional hydrate inhibitors in the art; wherein betaine and other conventional hydrate inhibitors can be mixed in any ratio.
According to the invention, a great deal of researches show that betaine can be used as a hydrate inhibitor to achieve good thermodynamic and kinetic inhibition effects, and the presumed reasons are as follows: researches show that Gan Ji acid and the like have certain thermodynamic inhibition effect on hydrate, and other amino acids can be presumed to have certain inhibition effect due to similar molecular structures of amino acids. However, among other amino acids, only betaine and water molecules have strong interactions and the secretion of betaine in animal and plant bodies is used for preserving the moisture required by biological cells in extreme climates. Because the cage structure of the hydrate is formed by hydrogen bonds of water molecules, the compound with larger molecular interaction with the water molecules can show more obvious thermodynamic performance of the hydrate, so the betaine is selected as a research object.
According to yet another aspect of the present invention, there is provided a hydrate inhibition method comprising adding a hydrate inhibitor to a system to inhibit hydrate formation in the system; the hydrate inhibitor contains betaine.
Optionally, the hydrate inhibitor further comprises an inhibitor M; the inhibitor M is at least one selected from soluble alcohol, water soluble salt and water soluble polymer.
Optionally, the soluble alcohol is selected from at least one of methanol and ethylene glycol.
Optionally, the water soluble salt is selected from at least one of sodium chloride and potassium nitrate.
Optionally, the water-soluble polymer is at least one selected from polyvinylpyrrolidone and polyvinylcaprolactam
Optionally, the mass ratio of the betaine to the inhibitor M is 1:0-1:3.
Alternatively, the hydrate inhibitor is formulated into an aqueous solution prior to use.
Alternatively, the aqueous solution has a concentration of 10wt% to 60wt%, preferably 10wt% to 50wt%.
The system used by the hydrate inhibitor is not strictly limited, and can be an oil-water system, a gas-water system, an oil-water-gas system and the like. In particular, the oil-water system may be a system composed of water and oil (e.g., water and gasoline); the gas-water system can be a system composed of water, C1-C4 light hydrocarbons (such as methane, ethane and the like), N 2、O2、CO2、H2 S and the like; the hydrocarbon-water system may be a three-phase system consisting of water, the above oil and the above gas.
The invention has no strict requirement on the volume content of water in the system, and the volume content of water in the system can be 1-99%, and further 50-99%.
In the present invention, the hydrate inhibitor may be used in an amount of 0.001% to 70% by mass of water in the system, further 10% to 70%, still further 30% to 70%.
The invention does not limit the generation condition of hydrate in the hydrate inhibitor inhibition system strictly, and the inhibition can be carried out under the conditions that the absolute pressure is 0.1-35 MPa and the temperature is-30-25 ℃; further, the reaction may be carried out under the conditions of an absolute pressure of 9 to 20MPa and a temperature of 5 to 12 ℃.
The hydrate is not strictly limited in the invention; in a specific embodiment, the hydrate may be a gas hydrate, such as methane hydrate, and the like.
The hydrate inhibitor provided by the invention has at least the following advantages:
(1) No volatility: the hydrate inhibitor exists in a solid powder form at normal temperature, and cannot volatilize to cause the inhalation of workers; in addition, the hydrate inhibitor does not volatilize when dissolved in various systems, so that the hydrate inhibitor can be used by simple dust prevention measures.
(2) Low toxicity: the hydrate inhibitor belongs to biological micromolecules, can be completely metabolized by animals and plants, has low risk to skin, little harm to human bodies, no accumulation effect and is generally used for industrial treatment.
(3) No pollution: the hydrate inhibitor is one of 20 amino acids constituting organisms, has biodegradability close to 100%, and has small environmental pollution, so that the defects of difficult degradation, high toxicity and the like of most of the existing hydrate inhibitors are overcome.
(4) The universality is good: the hydrate inhibitor can be widely used in oil-water systems, gas-water systems, oil-water gas systems and the like, has no strict requirements on the water content of the system, the concentration, the temperature, the pressure and other conditions during use, and has no limit on the application range.
(5) High efficiency: the hydrate inhibitor has good thermodynamic inhibition effect and kinetic inhibition effect, and the inhibition effect is obviously higher than that of other conventional hydrate inhibitors (such as methanol and the like) in the field at the same molar concentration; in particular to methane hydrate, which can improve the balance pressure by about 6.68MPa at 10 ℃.
Drawings
FIG. 1 is a schematic structural diagram of a reaction system for performing the hydrate inhibition test of the present invention.
Reference numerals illustrate:
1: a vacuum pump; 2: a reaction kettle; 3: a gas cylinder; 4: an air bath temperature control device; 5: air bath; 6: a magnetic stirring device; 7: a manual pump; 8: a piston; 9: a visual window; 10: a temperature display device; 11: and a pressure display device.
Detailed Description
The invention is further illustrated below in connection with specific examples, which are not to be construed as limiting the invention in any way.
Example 1
The hydrate inhibitor of this embodiment is only betaine, and the method for hydrate inhibition using the same includes the steps of:
1. solution preparation
Betaine was completely dissolved in deionized water to prepare a betaine solution having a molar concentration of 3mol/L (mass concentration of 34.5 wt%).
2. Hydrate inhibition
Hydrate inhibition experiments were performed using the reaction system shown in fig. 1, in which: the system adopted in the embodiment is a gas-water system, the hydrate inhibitor is a betaine solution with the concentration of 3mol/L, the gas is CH 4, a constant temperature pressure search method is adopted to obtain the balance condition of the hydrate, the experimental temperature is set to be 9.99 ℃, and the specific steps are as follows:
1) Vacuumizing the reaction kettle 2 by using a vacuum pump 1, and then sucking deionized water into the reaction kettle 2 by using negative pressure to clean the reaction kettle;
2) The prepared betaine solution is rinsed in a reaction kettle 2 for three times, and 50ml of betaine solution is sucked into the reaction kettle 2;
3) Filling a small amount of methane gas stored in the gas bottle 3 into the reaction kettle 2 to purge the reaction kettle 2, vacuumizing the reaction kettle 2, and filling the methane gas with the pressure of 13.0MPa after repeating the steps for three times;
4) Starting and adjusting an air bath temperature control device 4, enabling the temperature of the reaction kettle 2 to reach 9.99 ℃ through an air bath 5 and keeping constant, then starting a magnetic stirring device 6, and stirring at a constant speed at a stirring speed of 100 r/min;
5) Pressurizing the reaction kettle 2 through a manual pump 7 and a piston 8 to ensure that the pressure inside the reaction kettle 2 is slightly higher than the hydrate generation pressure, and observing whether the hydrate is generated in the reaction kettle 2 through a visible window 9 of the reaction kettle 2 by using a cold light source (usually, the hydrate is generated within 1 hour, the heat is released when the hydrate is generated, and the temperature of the reaction kettle 2 is increased to a certain extent);
6) When hydrate generation is observed, the manual pump 7 is rapidly rotated to reduce the pressure of the reaction kettle 2, so that the generated hydrate is partially decomposed as soon as possible;
7) When the temperature of the reaction vessel 2 was stabilized at the experimental temperature, the above step 4) was repeated, and when trace hydrate crystals (only a few hydrate crystal grains) were generated at the gas-liquid interface and adhered to the visible window 9 of the reaction vessel 2, the temperature and pressure of the reaction vessel 2 were maintained unchanged and stabilized for 4 hours.
8) After 4 hours, if trace hydrate crystals still exist in the reaction kettle 2, the pressure at the moment is the hydrate generation pressure at the experimental temperature; if the trace amount of hydrate crystals generated within 4 hours are completely dissolved, the pressure is lower than the hydrate generation pressure, the pressure is required to be adjusted to a higher value (the amplification is 0.02 MPa), trace amount of hydrate is regenerated in the reaction kettle 2, the stable existence of the trace amount of hydrate is ensured for 4 hours, and finally the hydrate generation pressure of an experimental system at the experimental temperature is obtained.
In the above test, the temperature may be displayed by the temperature display device 10 and the pressure may be displayed by the pressure display device 11.
According to detection, after trace hydrate exists stably and the pressure is stable for 4 hours, the obtained equilibrium pressure value is 13.93Mpa; meanwhile, the equilibrium pressure value obtained in the blank test (i.e., replacing the betaine solution with deionized water containing no betaine) was 7.25Mpa.
This shows that: the hydrate inhibitor of this example can increase the equilibrium pressure value by 6.68Mpa at a concentration of 3mol/L at about 10 ℃.
Example 2
The system used in this example was a gas-water system, the hydrate inhibitor was a betaine solution of 3mol/L (no other inhibitor was contained), the gas was CH 4, and a constant temperature pressure search method was used to obtain the equilibrium condition of the hydrate, the experimental temperature was set to 6.11℃and the hydrate inhibition test was performed by the same procedure as in example 1.
According to detection, after trace hydrate exists stably and the pressure is stable for 4 hours, the obtained equilibrium pressure value is 9.0Mpa; meanwhile, the equilibrium pressure value obtained in the blank test (i.e., replacing the betaine solution with deionized water containing no betaine) was 4.69Mpa.
This shows that: the hydrate inhibitor of this example can increase the equilibrium pressure value by 4.31Mpa at a concentration of 3mol/L at about 6 ℃.
Example 3
The system used in this example was a gas-water system, the hydrate inhibitor was a betaine solution (containing no other inhibitors) having a mass concentration of 21.9wt%, the gas was CH 4, and a constant temperature pressure search method was used to obtain the equilibrium condition of the hydrate, the experimental temperature was set to 10.0 ℃, and the hydrate inhibition test was performed by the same procedure as in example 1.
According to detection, after trace hydrate exists stably and the pressure is stable for 4 hours, the obtained equilibrium pressure value is 9.36Mpa; meanwhile, the equilibrium pressure value obtained in the blank test (i.e., replacing the betaine solution with deionized water containing no betaine) was 7.25Mpa.
This shows that: the hydrate inhibitor of this example can increase the equilibrium pressure value by 2.11Mpa at a mass concentration of 21.9wt% at about 10 ℃.
Example 4
The system used in this example was a gas-water system, the hydrate inhibitor was betaine solution (no other inhibitor) having a mass concentration of 6.81wt%, the gas was CH 4, and a constant temperature pressure search method was used to obtain the equilibrium condition of the hydrate, the experimental temperature was set to 10.0 ℃, and the hydrate inhibition test was performed by the same procedure as in example 1.
According to detection, after the trace amount of hydrate exists stably and the pressure is stable for 4 hours, the obtained equilibrium pressure value is 7.79Mpa; meanwhile, the equilibrium pressure value obtained in the blank test (i.e., replacing the betaine solution with deionized water containing no betaine) was 7.25Mpa.
This shows that: the hydrate inhibitor of this example can increase the equilibrium pressure value by 0.54Mpa at a mass concentration of 6.81wt% at about 10 ℃.
Example 5
The system adopted in this example was a gas-water system, the hydrate inhibitor was a betaine-compounded 10wt% glycol solution having a mass concentration of 21.9wt%, the gas was CH 4, and a constant temperature pressure search method was used to obtain the equilibrium condition of the hydrate, the experimental temperature was set to 10.0 ℃, and the hydrate inhibition test was performed by the same procedure as in example 1.
According to detection, after the trace amount of hydrate exists stably and the pressure is stable for 4 hours, the obtained equilibrium pressure value is 16.54Mpa; meanwhile, the equilibrium pressure value obtained in the blank test (i.e., replacing the betaine solution with deionized water containing no betaine) was 7.25Mpa.
This shows that: when the mass concentration of the betaine is 21.9wt% and the glycol solution is 10wt%, the equilibrium pressure value can be increased by 9.31Mpa, which indicates that the hydrate inhibitor can obviously improve the generation condition of the hydrate, thereby inhibiting the generation of the hydrate in the gas-water system.
Comparative example 1
The system used in this comparative example was a gas-water system, the hydrate inhibitor was a 3mol/L methanol solution, the gas was CH 4, a constant temperature pressure search method was used to obtain the equilibrium condition of the hydrate, the experimental temperature was set to 9.99℃and the hydrate inhibition test was performed by the same procedure as in example 1.
According to detection, at about 10 ℃, the hydrate inhibitor of the comparative example is stable in trace hydrate and stable in pressure for 4 hours, the obtained equilibrium pressure value is 12.14Mpa, and only the equilibrium pressure value is increased by 4.89Mpa and is far lower than that of the hydrate inhibitor of the invention, so that the inhibition effect of the hydrate inhibitor of the invention is far better than that of the conventional inhibitor in the field.
Comparative example 2
The system used in this comparative example was a gas-water system, the hydrate inhibitor was a glycine solution of 3mol/L, the gas was CH 4, a constant temperature pressure search method was used to obtain the equilibrium condition of the hydrate, the experimental temperature was set to 9.99℃and the hydrate inhibition test was performed by the same procedure as in example 1.
According to detection, at about 10 ℃, the hydrate inhibitor of the comparative example has a balance pressure value of 9.75Mpa after trace hydrate exists stably and the pressure is stable for 4 hours, and only the balance pressure value is increased by 2.5Mpa and is far lower than that of the hydrate inhibitor of the invention, so that the hydrate inhibitor of the comparative example has a good hydrate inhibition effect without any amino acid.
Any numerical value recited in this disclosure includes all values incremented by one unit from the lowest value to the highest value if there is only a two unit interval between any lowest value and any highest value. For example, if the amount of a component, or a process variable such as temperature, pressure, time, etc., is stated to be 50-90, it is meant in this specification that values such as 51-89, 52-88 … …, and 69-71, and 70-71 are specifically recited. For non-integer values, 0.1, 0.01, 0.001 or 0.0001 units may be considered as appropriate. This is only a few examples of the specific designations. In a similar manner, all possible combinations of values between the lowest value and the highest value enumerated are to be considered to be disclosed.
It should be noted that the above-described embodiments are only for explaining the present invention and do not constitute any limitation of the present invention. The invention has been described with reference to exemplary embodiments, but it is understood that the words which have been used are words of description and illustration, rather than words of limitation. Modifications may be made to the invention as defined in the appended claims, and the invention may be modified without departing from the scope and spirit of the invention. Although the invention is described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, as the invention extends to all other means and applications which perform the same function.
Claims (10)
1. Use of betaine as a component of a hydrate inhibitor for inhibiting hydrate formation in a system.
2. The use according to claim 1, wherein the hydrate inhibitor further comprises an inhibitor M; the inhibitor M is at least one selected from soluble alcohol, water soluble salt and water soluble polymer, preferably soluble alcohol;
And/or the system is an oil-water system, a gas-water system or an oil-water gas system.
3. The use according to claim 2, characterized in that the mass ratio of betaine to inhibitor M is 1:0 to 1:3.
4. Use according to claim 2 or 3, wherein the soluble alcohol is selected from at least one of methanol, ethylene glycol, preferably ethylene glycol;
and/or the inorganic salt is at least one selected from sodium chloride and potassium nitrate, preferably potassium nitrate.
And/or the water-soluble polymer is at least one selected from polyvinylpyrrolidone and polyvinylcaprolactam; polyvinylpyrrolidone is preferred.
5. A hydrate inhibition method, comprising adding a hydrate inhibitor to a system to inhibit hydrate formation in the system; the hydrate inhibitor contains betaine.
6. The hydrate inhibition method according to claim 5, wherein the hydrate inhibitor further contains an inhibitor M; the inhibitor M is at least one selected from soluble alcohol, water soluble salt and water soluble polymer;
preferably, the soluble alcohol is selected from at least one of methanol and ethylene glycol; and/or the water-soluble salt is selected from at least one of sodium chloride and potassium nitrate; and/or the water-soluble polymer is at least one selected from polyvinylpyrrolidone and polyvinylcaprolactam;
and/or the mass ratio of the betaine to the inhibitor M is 1:0-1:3.
7. The hydrate inhibition method according to claim 5 or 6, wherein the system is an oil-water system, a gas-water system or an oil-water-gas system;
and/or the volume content of water in the system is 1-99%;
and/or the hydrate is a gas hydrate, preferably methane hydrate.
8. The hydrate inhibition method according to any one of claims 5 to 7, wherein the hydrate inhibitor is used in an amount of 0.001 to 70% by mass of water in the system.
9. The hydrate inhibition method according to any one of claims 5 to 8, wherein the applicable conditions of the hydrate inhibitor are 0.1 to 35MPa absolute pressure and a temperature of-30 to 25 ℃.
10. The hydrate inhibition method according to any one of claims 5 to 9, wherein the hydrate inhibitor is formulated into an aqueous solution when used;
Preferably, the concentration of the aqueous solution is 10wt% to 60wt%.
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