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Chemical heat generating agent for natural gas hydrate exploitation and application of chemical heat generating agent

A kind of hydrate and chemical generation technology, applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of slowing down the heat generation rate and uncontrollable heat of chemical heat generating agents, so as to reduce the consumption of heat Effect

Active Publication Date: 2021-08-06
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a chemical heat generating agent for natural gas hydrate exploitation and its application, which solves the problem that the heat of the existing chemical heat generating agent is uncontrollable, and the chemical heat generating agent can be released under low temperature conditions A large amount of heat can meet the heating capacity, and can also regulate the release rate of heat, slow down the rate of heat generation, and meet the requirements of energy transmission in deep reservoirs in natural gas hydrate exploitation

Method used

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  • Chemical heat generating agent for natural gas hydrate exploitation and application of chemical heat generating agent
  • Chemical heat generating agent for natural gas hydrate exploitation and application of chemical heat generating agent
  • Chemical heat generating agent for natural gas hydrate exploitation and application of chemical heat generating agent

Examples

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Effect test

Embodiment 1

[0024] A chemical heat generating agent for natural gas hydrate exploitation, the main agent I of the heat generating agent includes the following components in mass volume percentage (W / V, g / mL): 1% foaming agent, 2% foam stabilizer agent, 10% sodium nitrite, and the balance is water; wherein, the foaming agent is selected from diquaternary ammonium adipate, and the foam stabilizer is selected from nano-silica particles. The auxiliary agent of the heat generating agent is CO 2 , main agent I and CO 2 The volume ratio is 1:4, and the main agent I and the auxiliary agent are mixed according to the volume ratio to obtain the foam liquid. The main agent II of the heat generating agent is NH 4 Cl aqueous solution, NH 4 The molar concentration of Cl aqueous solution is equal to the molar concentration of sodium nitrite in the foam liquid.

[0025] The preparation of the main ingredient I is as follows: add part of the water to the reaction vessel I, heat to 60°C, and then add 1...

Embodiment 2

[0031] A chemical heat generating agent for natural gas hydrate exploitation, the main agent I of the heat generating agent includes the following components in mass volume percentage (W / V, g / mL): 7.5% foaming agent, 7.5% foam stabilizer agent, 32% sodium nitrite, and the balance is water; wherein, the foaming agent is selected from diquaternary ammonium adipate, and the foam stabilizer is selected from nano silicon dioxide particles. The auxiliary agent of the heat generating agent is CO 2 , main agent I and CO 2 The volume ratio is 1:40, and the main agent I and the auxiliary agent are mixed according to the volume ratio to obtain the foam liquid. The main agent II of the heat generating agent is NH 4 Cl aqueous solution, NH 4The molar concentration of Cl aqueous solution is equal to the molar concentration of sodium nitrite in the foam liquid.

[0032] The preparation of the main ingredient I is as follows: add part of the water to the reaction vessel I, heat it to 60°C...

Embodiment 3

[0038] A chemical heat generating agent for natural gas hydrate exploitation, the main agent I of the heat generating agent includes the following components in mass volume percentage (W / V, g / mL): 1% foaming agent, 2% foam stabilizer agent, 10% sodium nitrite, and the balance is water; wherein, the foaming agent is selected from diquaternary ammonium adipate, and the foam stabilizer is selected from nano-silica particles. The auxiliary agent of the heat generating agent is SO 2 , main agent I and SO 2 The volume ratio is 1:10, and the main agent I and the auxiliary agent are mixed according to the volume ratio to obtain the foam liquid. The main agent II of the heat generating agent is NH 4 Cl aqueous solution, NH 4 The molar concentration of Cl aqueous solution is equal to the molar concentration of sodium nitrite in the foam liquid.

[0039] The preparation of the main ingredient I is as follows: add part of the water to the reaction vessel I, heat to 60°C, and then add ...

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Abstract

The invention discloses a chemical heat generating agent for natural gas hydrate exploitation and application of the chemical heat generating agent. The chemical heat generating agent comprises a main agent I, a main agent II and an auxiliary agent, wherein the main agent I is prepared from the following components in percentage by mass volume of 10 to 32 percent of NaNO2, 1 to 7.5 percent of foaming agent, 2 to 7.5 percent of foam stabilizer and the balance of water; the foaming agent is cationic Gemini quaternary ammonium salt; the foam stabilizer is nanoparticles; the auxiliary agent is acidic gas, and the acidic gas is selected from CO2 and / or SO2; the volume ratio of the main agent I to the auxiliary agent is 1: (4-40), and the main agent I and the auxiliary agent are mixed according to the volume ratio to obtain the foam liquid; and the main agent II is an NH4Cl aqueous solution. The chemical heat generating agent system disclosed by the invention can release a large amount of heat, can regulate and control the release speed of the heat, and meets the requirements of reservoir deep energy transportation in natural gas hydrate exploitation.

Description

technical field [0001] The invention relates to a chemical heat generating agent, in particular to a chemical heat generating agent for natural gas hydrate exploitation and application thereof. Background technique [0002] Natural gas hydrate is a solid compound similar to ice formed by natural gas (mainly composed of methane) and water under certain high pressure and low temperature conditions. The natural gas hydrate production process is a strong heat-absorbing process. During the production process, the temperature of the hydrate layer drops rapidly, leading to problems such as a decrease in gas production rate and channel blockage. [0003] In order to solve the above problems, the current conventional solution is to use hot water injection, hot steam injection and other methods for heating. However, there is a very common problem in these methods, that is, most of the heat of the thermal fluid is consumed in the near wellbore area. Insufficient heat supply required f...

Claims

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Application Information

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IPC IPC(8): E21B43/01E21B36/00E21B43/16E21B43/22
CPCE21B43/01E21B36/008E21B43/164E21B43/166
Inventor 袁青张豪姜松李风光赵金生孙长宇陈光进
Owner LIAOCHENG UNIV
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