Hydrate inhibitor and application thereof

A hydrate inhibitor and hydrate technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of low inhibitory activity, poor biodegradability, high synthesis cost, etc., and achieve no cumulative effect and no harmfulness Small and versatile

Inactive Publication Date: 2018-02-06
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low-dose hydrate inhibitors include hydrate kinetic inhibitors and antipolymerization agents; among them, kinetic inhibitors are mainly suitable for gas-water two-phase systems, and kinetic inhibitors represented by poly N-ethylene caprolactam have limited inhibitory activity. High, usually used under supercooling conditions, and it is easy to fail when it exceeds 10°C, especially its poor biodegradability,

Method used

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  • Hydrate inhibitor and application thereof
  • Hydrate inhibitor and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The hydrate inhibitor of this embodiment is proline, and the method for using it to inhibit hydrate comprises the following steps:

[0029] 1. Solution preparation

[0030] The proline was completely dissolved in deionized water to prepare a proline solution with a molar concentration of 3 mol / L (mass concentration was 34.5%).

[0031] 2. Hydrate inhibition

[0032] use figure 1 The reaction system shown was subjected to the hydrate inhibition test, wherein: the system used in this example was a gas-water system, the hydrate inhibitor was a 3mol / L proline solution, and the gas was CH 4 , the constant temperature and pressure search method is used to obtain the equilibrium condition of the hydrate, and the experimental temperature is set to 9.99°C. The specific steps are as follows:

[0033] 1) Use the vacuum pump 1 to evacuate the reactor 2, and then use negative pressure to inhale deionized water to clean the reactor 2 until it is cleaned;

[0034] 2) Rinse the rea...

Embodiment 2

[0045] The system used in this example is a gas-water system, the hydrate inhibitor is a 3mol / L proline solution, and the gas is CH 4 , the constant temperature and pressure search method was used to obtain the equilibrium condition of hydrate, the experimental temperature was set at 6.11°C, and the hydrate inhibition test was carried out using the same steps as in Example 1.

[0046] After testing, in this embodiment, after trace hydrates exist stably and the pressure is stable for 4 hours, the obtained equilibrium pressure value is 9.0Mpa; at the same time, the blank control test (i.e. replace the above-mentioned proline with deionized water without proline Acid solution) obtained equilibrium pressure value is 4.69Mpa.

[0047] This shows that: at about 6°C, the hydrate inhibitor of this example can increase the equilibrium pressure value by 4.31Mpa when the concentration is 3mol / L, indicating that the hydrate inhibitor can significantly improve the formation conditions of h...

Embodiment 3

[0049] The system used in this example is a gas-water system, the hydrate inhibitor is a proline solution with a mass concentration of 21.9 wt%, and the gas is CH 4 , the constant temperature and pressure search method was used to obtain the equilibrium condition of hydrate, the experimental temperature was set at 10.0°C, and the hydrate inhibition test was carried out using the same steps as in Example 1.

[0050] After testing, in this embodiment, after trace hydrates exist stably and the pressure is stable for 4 hours, the obtained equilibrium pressure value is 9.36Mpa; at the same time, the blank control test (i.e. replace the above-mentioned proline with deionized water without proline Acid solution) obtained equilibrium pressure value is 7.25Mpa.

[0051] This shows that: at about 10°C, the hydrate inhibitor of this example can increase the equilibrium pressure value by 2.11Mpa when the mass concentration is 21.9wt%, indicating that the hydrate inhibitor can significantl...

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Abstract

The invention provides a hydrate inhibitor and application thereof. The hydrate inhibitor provided by the invention is prepared from proline; a hydrate inhibiting method comprises the step of adoptingthe hydrate inhibitor for inhibiting the generation of a hydrate in an inhibition system, wherein the system is an oil-water system, a gas-water system or an oil-water-gas system. The hydrate inhibitor provided by the invention is low in toxicity, non-volatile, easy to degrade, environmentally-friendly and the like; in addition, a balance condition of hydrate generation can be greatly improved, and the hydrate inhibitor has favorable a thermodynamics inhibiting effect.

Description

technical field [0001] The invention belongs to the field of oil and gas production, and in particular relates to a hydrate inhibitor and application thereof. Background technique [0002] Some low molecular weight gases and some volatile liquids, such as C1~C4 light hydrocarbons, N 2 , O 2 , CO 2 、H 2 S, ethylene oxide, tetrahydrofuran, and halogenated alkanes can form non-stoichiometric cage crystals with water under certain temperature and pressure conditions, which are usually called clathrate hydrates, or hydrates for short. There are mainly three types of structures: Type I, Type II and Type H. For a long time, pipeline blockage caused by gas hydrate formation has been a thorny problem for the oil and gas production and transportation sector; especially for the development of offshore oil and gas fields and deep-sea transportation of oil and gas, the hydrate problem is particularly prominent, mainly due to the water temperature and pressure of the seabed The condi...

Claims

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Application Information

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IPC IPC(8): C09K8/524
Inventor 陈波孙强李阳杨郭绪强
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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