A novel hydrate kinetic inhibitor and its preparation method

Abstract

Disclosed is a hydrate kinetic inhibitor of a structural formula as represented by formula I. The inhibitor has a good water solubility, a high inhibitory activity, a capability of achieving a good inhibitory effect, a small usage amount and a reduced cost; has the advantages of a low dosage, a high efficiency, an extensive applicability, etc.; can effectively delay the hydrate nucleation time and reduce the hydrate generation rate in an environment of a high degree of undercooling at a low dosage concentration (0.1-10 wt%); is suitable for an oil-gas-water three-phase or oil-water or gas-water two-phase coexistence system; is applied to the inhibition of the generation of hydrates during the exploration, processing and transportation of oil and gas, without subjecting to undercooling and application constraints; and has a broad prospect of application. In formula I, R is *(CH2)m*, m = 1-5, and n = 10-10000.

Description

Technical field:

[0001] The invention relates to the technical field of chemical industry, in particular to a novel hydrate kinetic inhibitor and a preparation method thereof. Background technique:

[0002] Natural gas hydrate is an ice-like solid formed by water and natural gas under high pressure and low temperature conditions. The formation of hydrates has always been a problem that the oil and gas industry needs to avoid, because hydrates can block flow lines, valves, wellheads, and pipelines, causing serious losses to production.

[0003] Traditional methods to prevent hydrate formation include depressurization method, temperature raising method and water removal method. Research and practice have shown that these three methods have a certain suppression effect, but due to their high cost and application limitations, the application range of physical methods is relatively limited, and they are generally used as auxiliary suppression conditions and rescue methods after ...

Examples

Embodiment 1

[0028] Embodiment 1: The hydrate kinetics inhibitor (referred to as PVPSCH for short) as shown in formula II 2 COOH) synthesis

[0029]

[0030] Among them, the average value of n is 478.

[0031] The synthetic method comprises the following steps: Weigh 352mg (2mmol) of the chain initiator azobisisobutyronitrile into a 250mL eggplant-shaped reaction bottle, seal it with a rubber stopper, and then vacuumize and blow nitrogen three times; slowly add N-vinylpyrrole oxalanone monomer 20mL (206mmol), mercaptoacetic acid 0.56mL (about 5mmol) and N,N-dimethylformamide solvent 100mL, use liquid nitrogen to freeze-pump-heat cycle 3 times; Reaction at high temperature for 7 hours; the obtained initial product was cooled to room temperature and then slowly dripped into 1000mL cold ethyl acetate for recrystallization, suction filtration, and the obtained solid was dried in a vacuum oven at 45°C for 48 hours and then dried at 105°C After drying for 1 hour, the target product was obta...

Embodiment 2

[0034] Embodiment 2: The hydrate kinetic inhibitor (PVPSCH 2 CH 2 COOH) synthesis

[0035]

[0036] Among them, the average value of n is 1665.

[0037]The synthesis method comprises the following steps: Weigh 176mg (1mmol) of the chain initiator azobisisobutyronitrile into a 100mL eggplant-shaped reaction bottle, seal it with a rubber stopper, and then vacuumize and blow nitrogen for 3 times; slowly add N-vinylpyrrole 11mL of oxalanone monomer, 0.28mL of 3-mercaptopropionic acid (about 2.5mmol) and 50mL of N,N-dimethylformamide solvent, freezing with liquid nitrogen-pumping-heating cycle 3 times; ℃ for 12 hours; the obtained primary product was cooled to room temperature and then slowly dripped into 400mL of cold ethyl acetate for recrystallization and suction filtration. Drying under high temperature for 1 hour, the target product was obtained. The weight average molecular weight (Mw) is 184908, its 13 CNMR spectrum (D 2 O as a solvent) such as Figure 4 As shown, ...

Embodiment 3

[0038] Embodiment 3: inhibition effect evaluation

[0039] The method for inhibiting effect evaluation of the present invention is as follows:

Technical field:

[0001] The invention relates to the technical field of chemical industry, in particular to a novel hydrate kinetic inhibitor and a preparation method thereof. Background technique:

[0002] Natural gas hydrate is an ice-like solid formed by water and natural gas under high pressure and low temperature conditions. The formation of hydrates has always been a problem that the oil and gas industry needs to avoid, because hydrates can block flow lines, valves, wellheads, and pipelines, causing serious losses to production.

[0003] Traditional methods to prevent hydrate formation include depressurization method, temperature raising method and water removal method. Research and practice have shown that these three methods have a certain suppression effect, but due to their high cost and application limitations, the application range of physical methods is relatively limited, and they are generally used as auxiliary suppression conditions and rescue methods after ...

Examples

Embodiment 1

[0028] Embodiment 1: The hydrate kinetics inhibitor (referred to as PVPSCH for short) as shown in formula II 2 COOH) synthesis

[0029]

[0030] Among them, the average value of n is 478.

[0031] The synthetic method comprises the following steps: Weigh 352mg (2mmol) of the chain initiator azobisisobutyronitrile into a 250mL eggplant-shaped reaction bottle, seal it with a rubber stopper, and then vacuumize and blow nitrogen three times; slowly add N-vinylpyrrole oxalanone monomer 20mL (206mmol), mercaptoacetic acid 0.56mL (about 5mmol) and N,N-dimethylformamide solvent 100mL, use liquid nitrogen to freeze-pump-heat cycle 3 times; Reaction at high temperature for 7 hours; the obtained initial product was cooled to room temperature and then slowly dripped into 1000mL cold ethyl acetate for recrystallization, suction filtration, and the obtained solid was dried in a vacuum oven at 45°C for 48 hours and then dried at 105°C After drying for 1 hour, the target product was obta...

Embodiment 2

[0034] Embodiment 2: The hydrate kinetic inhibitor (PVPSCH 2 CH 2 COOH) synthesis

[0035]

[0036] Among them, the average value of n is 1665.

[0037]The synthesis method comprises the following steps: Weigh 176mg (1mmol) of the chain initiator azobisisobutyronitrile into a 100mL eggplant-shaped reaction bottle, seal it with a rubber stopper, and then vacuumize and blow nitrogen for 3 times; slowly add N-vinylpyrrole 11mL of oxalanone monomer, 0.28mL of 3-mercaptopropionic acid (about 2.5mmol) and 50mL of N,N-dimethylformamide solvent, freezing with liquid nitrogen-pumping-heating cycle 3 times; ℃ for 12 hours; the obtained primary product was cooled to room temperature and then slowly dripped into 400mL of cold ethyl acetate for recrystallization and suction filtration. Drying under high temperature for 1 hour, the target product was obtained. The weight average molecular weight (Mw) is 184908, its 13 CNMR spectrum (D 2 O as a solvent) such as Figure 4 As shown, ...

Embodiment 3

[0038] Embodiment 3: inhibition effect evaluation

[0039] The method for inhibiting effect evaluation of the present invention is as follows:

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