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High-temperature-resistant hydrate inhibitor and preparation method thereof

A hydrate inhibitor and high temperature resistant technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of inhibitor degradation failure, poor high temperature resistance effect, inconvenient on-site construction, etc., and achieve the goal of reducing inhibitor Dosage, increase the effect of inhibiting hydration, the effect of convenient injection

Active Publication Date: 2021-04-02
TIANJIN XINXIANG PETROLEUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such inhibitors are usually not effective in high temperature resistance. For wells above 110 °C, the high temperature environment will cause the degradation of the inhibitor to fail. At the same time, the above-mentioned hydrate inhibitors are high-molecular-weight polymers, which have high viscosity at low temperatures, resulting in winter construction. Difficult to inject when the site needs to be heated to lower the viscosity before injecting, which is not convenient for on-site construction

Method used

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  • High-temperature-resistant hydrate inhibitor and preparation method thereof
  • High-temperature-resistant hydrate inhibitor and preparation method thereof
  • High-temperature-resistant hydrate inhibitor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] This embodiment provides a high temperature resistant hydrate inhibitor and its preparation method, the inhibitor includes by mass percentage:

[0030] Polypropylene glycol-bis-2-aminopropyl ether with an average molecular weight of 200-300, 45%;

[0031] Tetraethylenepentamine, 3%;

[0032] PAAS, 0.4%;

[0033] Span-80, 0.2%;

[0034] Isopropanol, 0.5%;

[0035] Water, 50.9%.

[0036] Among the above ratios, the high-temperature-resistant PAAS has better compatibility with high-minerality brine, and it can be combined with polypropylene glycol-bis-2-aminopropyl ether to achieve the inhibition of hydrates at high temperatures.

[0037] The preparation process of above-mentioned inhibitor is as follows:

[0038] First, add 50.9% of water, 0.2% of Span-80, and 0.5% of isopropanol into the reactor, and stir for 30 minutes; then add 0.4% of PAAS into the reactor and stir for 20 minutes; Ethylenepentamine was added into the reactor and stirred for 20 minutes;

[0039]...

Embodiment 2

[0041] This embodiment provides a high temperature resistant hydrate inhibitor and its preparation method, the inhibitor includes by mass percentage:

[0042] Polypropylene glycol-bis-2-aminopropyl ether with an average molecular weight of 200-300, 40%;

[0043] Diethylenetriamine, 1%;

[0044] PAAS, 0.3%;

[0045] Span-80, 0.1%;

[0046] Isopropanol, 0.4%;

[0047] Water, 58.2%.

[0048] The preparation process of above-mentioned inhibitor is as follows:

[0049] First, 58.2% of water, 0.1% of Span-80, and 0.4% of isopropanol were added to the reactor and stirred for 30 minutes; then 0.3% of PAAS was added into the reactor and stirred for 20 minutes; Ethylenetriamine was added to the reactor and stirred for 20 minutes;

[0050] Finally, heat up 40% of the polypropylene glycol-bis-2-aminopropyl ether reactor with an average molecular weight of 200-300 to 140°C, stir and react for 2-3 hours, and cool down to normal temperature to obtain uniform high-temperature-resistant ...

Embodiment 3

[0052] This embodiment provides a high temperature resistant hydrate inhibitor and its preparation method, the inhibitor includes by mass percentage:

[0053] Polypropylene glycol-bis-2-aminopropyl ether with an average molecular weight of 200-300, 42%;

[0054] Diethylenetriamine, 1%, triethylenetetramine 1%, tetraethylenepentamine 1%;

[0055] PAAS, 0.35%;

[0056] Span-80, 0.15%;

[0057] Isopropanol, 0.45%;

[0058] Water, 54.05%.

[0059] The preparation process of above-mentioned inhibitor is as follows:

[0060] First, add 42% of water, 0.15% of Span-80, and 0.45% of isopropanol into the reactor, and stir for 30 minutes; then add 0.35% of PAAS into the reactor and stir for 20 minutes; Ethylenetriamine, triethylenetetramine, and tetraethylenepentamine mixture were added into the reactor and stirred for 20 minutes;

[0061] Finally, heat up 42% of the polypropylene glycol-bis-2-aminopropyl ether reactor with an average molecular weight of 200-300 to 140°C, stir and ...

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Abstract

The invention provides a high-temperature-resistant hydrate inhibitor and a preparation method thereof, and aims at solving the problems of degradation failure, high viscosity and difficult injectionof a low-dose hydrate inhibitor at the temperature of 110 DEG C or above in the prior art. The inhibitor comprises the following components in percentage by mass: 40%-45% of polypropylene glycol-bis-2amino propyl ether; 1%-3% of a synergist; 0.3%-0.4% of PAAS; 0.1%-0.2% of a Span-80; 0.4%-0.5% of isopropyl alcohol; and 50.9% to 58.2% of water. According to the inhibitor, a main agent is a small-molecular-weight product synthesized at high temperature, the product is low in viscosity and resistant to temperature, ether bonds and amido in molecules easily form hydrogen bonds with water molecules, and an excellent hydrate inhibition effect is achieved; and a synergist plays a role in disturbing and destroying a water molecule cage structure by capturing CO2 and H2S in natural gas, so that thenucleation time of the hydrate can be remarkably prolonged, the hydrate inhibiting effect of the product is remarkably improved, and meanwhile, the dosage of an inhibitor is reduced.

Description

technical field [0001] The invention belongs to the fields of oil and gas exploitation and gathering and transportation, and in particular relates to a high-temperature-resistant hydrate inhibitor and a preparation method thereof. Background technique [0002] In the low-temperature and high-pressure pipelines in the process of natural gas extraction, small molecule gases easily form ice-snow-like cage crystals with liquid water, that is, natural gas hydrate. [0003] After the formation of natural gas hydrate, it will block the wellbore, pipeline, valve and various equipment, which will bring great harm to the exploitation, gathering, transportation and processing of natural gas. Therefore, it is necessary to add natural gas hydrate inhibitor. Hydrate inhibitors are divided into thermodynamic inhibitors (methanol, ethylene glycol, etc.) and low-dose hydrate inhibitors. Low-dose hydrate inhibitors are more and more popular among researchers because of their safety, environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52
CPCC09K8/52
Inventor 鲍素领邰津吴振华吴丹
Owner TIANJIN XINXIANG PETROLEUM TECH CO LTD
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