Natural gas hydrate control agent

A technology of hydrate and natural gas, applied in drilling composition, gas/liquid distribution and storage, pipeline system, etc., to reduce the cost of use, prolong the formation time, and improve the inhibition effect.

Active Publication Date: 2015-09-16
北京沃特普特环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide a natural gas hydrate prevention and control age

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0037] Example 1:

[0038] The composition of the natural gas hydrate prevention and control agent Q1 in weight percentage is: 40% of vinylpyrrolidone, sodium acrylate, terpolymer formed by polymerization of acrylamide, 25% of fatty alcohol polyoxyalkylene, 30% of ethylene glycol , 5% hydroxyethylene diphosphonic acid.

[0039] The natural gas hydrate prevention and control agent Q1 was tested on site. The test site was Well No. 22 in a domestic gas field, and the following test data were obtained:

[0040] Statistical table 1 of field test results of Well No. 22 in a domestic gas field

[0041] Apostille date

[0042] December 23

[0043] The validity period of the existing hydrate inhibitor is generally 3-4 days, and the cost is 32 yuan / kg. The difference with the existing longest number of days-the difference between the longest number of days in this embodiment and the existing shortest number of days, the calculation method in the following embodimen...

Example Embodiment

[0044] Example 2:

[0045] The composition of the natural gas hydrate prevention and control agent Q2 in weight percentage is: 60% of vinylpyrrolidone, sodium acrylate, terpolymer formed by polymerization of acrylamide, 10% of low-foaming surfactant, specifically Huntsman TERIC 168, 28% ethanol, 2% aminotrimethylenephosphonic acid.

[0046] The natural gas hydrate prevention and control agent Q2 was tested on site, and the test site was Well No. 22 in a domestic gas field, and the following test data were obtained:

[0047] Statistical table 2 of field test results of Well No. 22 in a domestic gas field

[0048] Apostille date

[0049] The validity period of the existing hydrate inhibitor is generally 3-4 days, and the cost is 32 yuan / kg. The validity period of this embodiment is 6-7 days, which is 2-4 days longer than that, and the growth rate is 50%-133 %, and the cost is 24 yuan / kg.

Example Embodiment

[0050] Example 3:

[0051] The composition of the natural gas hydrate prevention and control agent Q3 in weight percentage is: 50% of vinylpyrrolidone, sodium acrylate, and a terpolymer formed by polymerization of acrylamide, and 14% of a low-foaming wetting agent. Specifically, DOW TRITON low-foaming agent is selected. Wetting agent CF-10, 35% sorbitol, 1% sodium tripolyphosphate.

[0052] The natural gas hydrate prevention and control agent Q3 was tested on site, and the test site was Well No. 22 in a domestic gas field, and the following test data were obtained:

[0053] Statistical table 3 of field test results of Well 22 in a domestic gas field

[0054] Apostille date

[0055] The validity period of the existing hydrate inhibitor is generally 3-4 days, and the cost is 32 yuan / kg. The validity period of this embodiment is 7-8 days, which is an increase of 3-5 days, and the growth rate is 75%. -167%, and the cost is 23 yuan / kg.

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PUM

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Abstract

The invention relates to a natural gas hydrate control agent which comprises the following components in percentage by weight: 40-60% of dynamical inhibitor, 10-25% of surfactant, 15-35% of organic alcohol and 1-5% of corrosion inhibitor. The surfactant is one of fatty alcohol polyoxy alkyl ether, a low-foaming surfactant and a low-foam wetting agent. By using the fatty alcohol polyoxy alkyl ether, low-foaming surfactant or low-foam wetting agent as the surfactant, no additional defoaming agent is needed, thereby lowering the use cost. On the premise of not increasing the cost, the control agent controls the weight percent of the dynamical inhibitor at 40-60%, can effectively prolong the hydrate formation time, and has higher hydrate inhibition effects.

Description

technical field [0001] The invention relates to the field of hydrate inhibitors, in particular to a natural gas hydrate prevention and control agent. Background technique [0002] During the extraction, processing and transportation of oil and natural gas, the small molecular gas in oil and gas interacts with water under certain temperature and pressure conditions to form ice-like solid hydrates, which can block wellbores, pipelines, valves and Equipment, thus affecting the normal operation of natural gas exploitation, gathering and transportation and processing. Generally speaking, there are three forms of hydrates formed in wellbore and surface pipelines: [0003] (1) The smooth tube wall becomes rough due to the attachment of hydrate. One part of the fluid passes and the other part slides off; [0004] (2) The hydrate forms a non-dense mesh plug in the tube. During the lifting process, the gas passes through the non-dense hydrate mesh plug, and part of the liquid auto...

Claims

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Application Information

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IPC IPC(8): C09K8/524F17D1/04
CPCC09K8/524C09K2208/22F17D1/04
Inventor 王程刘尚军
Owner 北京沃特普特环境科技有限公司
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