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Natural gas hydrate preventing and controlling agent and application method thereof

An application method and technology of natural gas, applied in the direction of drilling composition, chemical instruments and methods, reagents, etc., can solve the problems of deicing agent loss, low recovery rate, reducing potassium formate to inhibit natural gas hydrate, etc.

Inactive Publication Date: 2017-07-07
BEIJING HAOBO WANWEI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, after adding 50% potassium formate aqueous solution into the natural gas flow channel, it will form a salt with a solubility of less than 10% of the solubility of potassium formate with calcium ions, magnesium ions, and chloride ions in the natural gas flow channel, thereby greatly reducing the inhibition of natural gas hydration by potassium formate. Moreover, when the solubility of magnesium formate, calcium formate, and potassium chloride is reached or exceeded, magnesium formate, calcium formate, and potassium chloride salt crystals will be precipitated in the natural gas flow channel, which will block the natural gas flow channel and cause natural gas production. not working
[0012] 2) The deicing agent liquid described in this invention reacts with calcium ions, magnesium ions, iron ions, chloride ions, carbonate ions, sulfate ions, etc. in the water to form salts with a solubility much lower than that of the deicing agents, which will evaporate in ventilation. Salt crystals are precipitated when water and deicing agent liquid is recovered, resulting in serious loss of deicing agent and low recovery rate
[0015] In the same way, further calculation shows that if the technical scheme described in the invention is adopted, at an ambient temperature of 30°C, the 49wt% potassium formate aqueous solution recovered from the sewage containing 7wt% potassium formate will precipitate when used in an environment of 0°C. Potassium chloride salt crystal 32g / L will inevitably cause salt crystal blockage in the dosing system and natural gas pipeline

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0151] A natural gas hydrate prevention and control agent comprises glycerol solution.

[0152] The glycerol solution refers to an aqueous solution of glycerol.

[0153] Experiments show that: when the temperature is lower than 10°C, glycerol is in a solidified state; the freezing point (or freezing point) of glycerol aqueous solution and glycerol is essentially different, and the freezing points of glycerol aqueous solution are all lower than the melting point of glycerol At 20°C, the freezing point of 10% glycerol aqueous solution is -1.5°C, the freezing point of 30% glycerol aqueous solution is -10°C, the freezing point of 50% glycerol aqueous solution is -23°C, and the freezing point of 65% glycerol aqueous solution It is -45°C, the freezing point of 80% glycerol aqueous solution is -20°C, and the freezing point of 90% glycerol aqueous solution is -1.5°C; it can be seen from the known knowledge in the field that the natural gas coming out of the formation must contain wate...

Embodiment 2

[0157] A natural gas hydrate prevention and control agent, which includes an alcohol solution of glycerol, the solvent of the alcohol solution of glycerol can be selected from methanol, ethanol, propanol, butanol, octanol, pentanol, fusel oil Any one or a mixture of any two or more in any proportion.

[0158] Furthermore, the fusel oil is selected from any one of the fusel oil by-product of alcohol production by fermentation method, fusel oil by-product of butadiene production by alcohol method, or a mixture of them in any proportion.

[0159] Public information shows that glycerol and ethanol are miscible; fusel oil is liquid at normal temperature and pressure, and its main component is octanol.

[0160] Experiments show that glycerol is miscible with methanol, propanol, butanol, octanol, pentanol and fusel oil.

[0161] The prevention and control agent effect of this implementation is similar to embodiment 1.

Embodiment 3

[0163]Repeat Practices 1-2, except it also includes or adds the following:

[0164] Salt and / or brine, alkali or / and alkaline water, ethylene glycol and / or ethylene glycol solution, triethylene glycol and / or triethylene glycol solution, water-soluble high molecular polymer and / or water-soluble high molecular polymer aqueous solution, Any one of urea and / or urea solution, emulsifier, corrosion inhibitor or any two or more thereof in any proportion.

[0165] Public information shows that ethylene glycol, also known as glycol, is miscible with water, ethanol, and glycerin; triethylene glycol, also known as triethylene glycol, is miscible with water, alcohol, and glycerin.

[0166] It can be seen from the known knowledge in the art that by using existing technologies such as pumps, screw pumps, and solid-liquid mixed delivery pumping devices, solidified glycerin, solid salt or alkali, solid surfactants and arbitrary ratios thereof can be formed in any state. The mixture is added ...

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Abstract

The invention discloses a natural gas hydrate preventing and controlling agent. The natural gas hydrate preventing and controlling agent comprises glycerol and / or a glycerol solution. The invention also discloses an application method of the natural gas hydrate preventing and controlling agent. The natural gas hydrate preventing and controlling agent can effectively solve the problem about inhibition or prevention and control of the natural gas hydrate when being applied to production as well as storage and transportation of the natural gas, can be used for exploiting the natural gas from the natural gas hydrate system or mineral resources, and also can be used for reducing the dew point of the natural gas and solving the problem that the natural gas flow channel is frozen and blocked; and the advantages and characteristics of easiness in implementation, wide application, easiness in popularization and the like are achieved.

Description

technical field [0001] The invention relates to the fields of natural gas production and natural gas hydrate, in particular to a natural gas hydrate prevention and control agent and an application method thereof. Background technique [0002] On page 277, line 2-3 of "Oilfield Chemistry", the first printing of the first edition of China University of Petroleum Press in July 2000, it was stated: "Under certain conditions, natural gas can form hydrates with water, causing natural gas pipelines to produce hydrates. Blockage. In order to solve this problem, we should understand the conditions, structure and suppression method of gas hydrate generation.” Therefore, in the production, storage and transportation of natural gas, the problem of suppression or prevention of gas hydrate must be involved. [0003] Lines 10-11 on page 269 of the "Oilfield Chemistry" once stated: "Under formation conditions, natural gas is in contact with water, so natural gas always contains a certain am...

Claims

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Application Information

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IPC IPC(8): C09K8/524F17D1/04F17D3/14E21B43/01E21B43/22
CPCC09K8/524E21B41/0099E21B43/01E21B43/16F17D1/04F17D3/14Y02P20/141
Inventor 李晟贤
Owner BEIJING HAOBO WANWEI TECH
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