Composite type hydrate inhibitor

A technology of hydrate inhibitors and compositions, which is applied in the direction of drilling compositions, pipeline systems, chemical instruments and methods, etc., can solve the problems of insufficient inhibition ability and inability to be applied on a large scale, so that it is not easy to block pipelines and reduce costs. Low, good effect

Inactive Publication Date: 2013-07-10
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Kinetic inhibitors have the advantages of small dosage and high performance, but in the face of complex field conditions in oil and gas fields, they still show insufficient inhibitory ability and cannot be applied to actual production on a large scale

Method used

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  • Composite type hydrate inhibitor
  • Composite type hydrate inhibitor
  • Composite type hydrate inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The synthetic method of embodiment 1 polyvinylcaprolactam

[0026] Using N-vinyl caprolactam monomer and azobisisobutyronitrile as an initiator, carry out free radical solution polymerization in an aqueous solution to obtain the polyvinyl caprolactam; the mass ratio of the monomer to the solvent is 1: 2~1:10, the amount of initiator accounts for 5-10% of the mass of the monomer, the reaction temperature of the polymerization reaction is 40-90°C, and the reaction time is 2-12h.

[0027] like figure 1 As shown, comparing the infrared spectra of monomers and polymers, at 1625cm of the polymer infrared spectrum -1 The -C=C bond stretching vibration peak disappears, 3105cm -1处烯碳上 The characteristic absorption of protons also disappeared, so it can be preliminarily determined that the polymer no longer contains double bonds, and the reaction product is polyvinyl caprolactam. like figure 2 and 3 As shown, the monomer N-vinylcaprolactam has a neat single peak, while poly...

Embodiment 2

[0028] Example 2 Experimental method for performance evaluation of inhibitors

[0029] The polyvinyl caprolactam composite inhibitor performance evaluation of the present invention adopts THF test method, specifically:

[0030] (1) Preparation of polyethylene caprolactam inhibition solution

[0031] Accurately weigh a certain mass of polyvinyl caprolactam into a 100ml round bottom flask, add water and stir to dissolve, and prepare polyethylene caprolactam aqueous solutions with mass fractions of 1%, 3%, and 5% for later use.

[0032] (2) Accurately pipette 10 ml of polyethylene caprolactam aqueous solution into a round bottom flask, add 2.65 ml of tetrahydrofuran, stopper the bottle tightly, and shake the flask to mix the inhibitor solution and THF evenly.

[0033] (3) In order to eliminate the influence of room temperature, adjust the temperature of the refrigerator in advance, put the flask in the refrigerator, and keep it at 8°C for 15 minutes to keep the initial state as ...

Embodiment 3

[0041] Based on the quality of water in the system, a compound hydrate inhibitor containing 1% polyvinylcaprolactam mass concentration and 5% methanol mass concentration was prepared, added to 19wt% THF aqueous solution, and the performance was evaluated by THF method. Under normal pressure, the reaction temperature was maintained at 0°C, and the stirring speed was kept consistent in each experiment. Hydrate was formed after 887 minutes of reaction.

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Abstract

The invention discloses a hydrate inhibitor composite which comprises the following components in parts by weight: 1-5 parts of polyvinyl alcohol caprolactam and 1-8 parts of mixed preparations, wherein the mixed preparations are selected from one or more of alcohols, ethers or polymers. The hydrate inhibitor composite disclosed by the invention enhances the inhibition property of an inhibitor by taking the dynamic inhibitor as a main agent and adding certain mixed preparations.

Description

technical field [0001] The invention relates to a composite hydrate inhibitor, which belongs to the technical field of oil and gas field additives. Background technique [0002] During oil and gas extraction and transportation, especially under low temperature and high pressure conditions, gas molecules in natural gas can combine with water to form ice-like crystals, called natural gas hydrates. In 1930, Hammerschmidt discovered the phenomenon of natural gas hydrates clogging natural gas transportation pipelines and gas wells, and the problem of natural gas hydrates gradually attracted close attention from the industry. The huge troubles brought by hydrates to oil and gas production have become an urgent problem to be solved. [0003] The main ways to inhibit the formation of natural gas hydrates are: (1) remove the moisture in the natural gas; (2) heat the pipeline (the formation of hydrates is possible below a certain temperature); (3) control the pressure (the hydration ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524F17D1/02
Inventor 王凯郝红闫晓艳赵君民
Owner NORTHWEST UNIV(CN)
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