Kinetic inhibition oil-water emulsion responsive to hydrates and preparation method and application of emulsion

A kinetic inhibitor and kinetic technology, which is applied in mechanical equipment, gas/liquid distribution and storage, pipeline systems, etc., can solve the problem of inability to effectively prevent growth, aggregation and blockage of pipelines, decreased inhibitory effect of hydrate kinetic inhibitors, Concentration drop and other problems, to achieve the effect of ensuring performance, avoiding long-term contact, and stable performance

Active Publication Date: 2018-12-11
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, during the time interval from injection to the hydrate growth area, the concentration of the inhibitor in the water phase may decrease due to the organic phase dissolved in the pipeline or contact with other additives (preservatives, wax inhibitors), resulting in Hydrate Kinetic Inhibitors Decreased Inhibition
In addition, a prominent problem in the application of kinetics is that once hydrates are formed in the system, the kinetic inhibitors either disturb the water molecules in the system through hydrogen bonds to prevent the formation of new hydrate crystal nuclei, or through steric hindrance The effect prevents the agglomeration between water molecules and generates more new hydrates, but the hydrate kinetics suppression cannot quickly suppress the hydrate crystal nuclei appearing in the pipeline one-to-one, and cannot effectively prevent the existing hydrates in the system. The growth and aggregation of crystal nuclei and the resulting safety hazards such as blockage of pipelines

Method used

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  • Kinetic inhibition oil-water emulsion responsive to hydrates and preparation method and application of emulsion
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  • Kinetic inhibition oil-water emulsion responsive to hydrates and preparation method and application of emulsion

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Experimental program
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Effect test

Embodiment 1

[0036] The invention adopts a microfluidic preparation method to prepare W / O / W type inhibitor emulsion. ① Dissolve the inhibitor in 10 wt% ethylene glycol aqueous solution, based on the mixed solution, the inhibitor concentration is 50 wt%; after fully dissolved, add 5.0 wt% polyvinyl alcohol as an active agent, and add a small amount of dye As a mark to track the cracking of the inhibited emulsion; ② Slowly inject the prepared inner layer inhibitor solution through a 300 μm capillary tube at a rate of 1 mL / h containing 99.0 wt% 2-phenoxyethyl acrylate and In the pipeline of the 1.0wt% photoinitiator mixed solution (the inner diameter of the pipeline is 350 μm, and the flow rate is 1.5 mL / h), a water-in-oil structure is naturally formed according to the polarity difference of the two solutions; ③ After that, the formed water-in-oil structure The structure was injected into a pipe (inner diameter 380 μm, flow rate 4.5 mL / h) containing 5.0 wt% polyvinyl alcohol solution to form ...

Embodiment 2

[0040] The hydrate inhibitor evaluation test system is a visual high pressure coil tube device. The device has a high-pressure stainless steel wheel tube reactor, temperature and pressure sensors, temperature control system, vacuum and data acquisition system and pipeline endoscope, which can reliably evaluate the performance of the inhibitor. Using this device can obtain evaluation indicators of the nucleation stage such as durable subcooling and induction time of the system, as well as hydrate blockage, etc., so as to comprehensively evaluate hydrate inhibitors (its structure is as shown in Chinese patent CN201410431032.7 record in). The results are scientific and reliable, with excellent reproducibility and evaluation capabilities. All the following implementation cases are tested with this device, and the induction time method is used to test the inhibition performance of the inhibitor on the hydrate phenomenon.

[0041] The present invention uses a high-pressure stirred...

Embodiment 3

[0044] The invention uses a high-pressure stirred tank with a visible window to test the release process and performance of inhibiting the oil-water emulsion. After cleaning the reactor, the temperature of the reactor was stabilized at 25.0 o At C, add 237.5mL deionized and 12.5g suppressed oil-water emulsion to the reactor, and fill it with 11.6MPa methane gas. After the gas is dissolved and balanced, from 25 o C starts to cool down, with 1 o The rate of C / h is carried out, and the induction time of the first appearance of hydrate crystal nuclei, the situation of inhibiting the release of high-concentration inhibitors from the emulsion in the visible window, and the growth rate of hydrate crystal nuclei are recorded. Figure 4 The test results show that from 25 o C began to cool down to the end of the test, the system first appeared hydrate crystal nuclei, the growth rate of crystal nuclei, and the effect of inhibiting the release of high-concentration inhibitors from the ...

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Abstract

The invention discloses kinetic inhibition oil-water emulsion responsive to hydrates and a preparation method and application of the emulsion. The emulsion is a W/O/W type emulsion; an aqueous phase on an innermost layer is a solution composed of a hydrate kinetic inhibitor and a mixture of water and ethylene glycol, and a small amount of polyvinyl alcohol is added to serve as a surfactant; an intermediate oil phase is a solution of photocurable resin 2-phenoxyethyl acrylate and a small amount of photoinitiator; an outermost layer is a polyvinyl alcohol solution. Inhibitor capsules can be stable in an oil and gas conveying pipeline and cannot be broken due to the factors such as pressure and compositions. When hydrate crystal nuclei are formed on the surface of the emulsion, the structureof the photocurable resin is destroyed, so that an internal high-concentration inhibitor solution is released, the released hydrate inhibitor can directly act on the hydrate crystal nuclei on the surface of the emulsion for efficiently inhibiting the growth of the hydrate crystal nuclei, the size of the hydrate crystal nuclei is controlled, and the solid hydrates are prevented from blocking the pipeline.

Description

technical field [0001] The invention relates to the technical field of oil and gas hydrates, in particular to a kinetically inhibited emulsion responsive to hydrates. Background technique [0002] In the pipelines of natural gas and petroleum fluids, various low-boiling hydrocarbons such as methane, ethane, propane, carbon dioxide, and hydrogen sulfide react with water under certain temperature and pressure conditions to form a non-stoichiometric cage-type solid substance. Also known as clathrate hydrate crystals. In the oil and gas industry, the formation of gas hydrates will lead to the blockage of oil and gas transportation pipelines, and even the bursting of pipelines, which will bring many safety hazards and huge economic losses to the exploitation and transportation of oil and natural gas. In addition, for offshore oil and gas field development and deep-sea pipeline transportation, the problem of hydrates is also particularly prominent, because the temperature and pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17D1/17F17D1/20
CPCF17D1/17F17D1/20
Inventor 许书瑞蔡卓弟廖文波钟国玉
Owner DONGGUAN UNIV OF TECH
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