Clean natural gas exploiting method

Abstract

The invention discloses a clean natural gas exploiting method which comprises the following steps of: 1) adding an ice inhibitor, 2) separating liquid from natural gas, 3) sending the gas obtained in step 2) into an open container, 4) adding alkali into the open container for regeneration, 5) separating waste slag, 6) sending the gas obtained in step 5) into another open container, 7) ventilatingand removing moisture, 8) conducting separation and purification, and 9) recycling the ice inhibitor solution. The invention has the advantages that the clean natural gas exploiting method overcomes the defects of the existing natural gas exploiting method, effectively exploits natural gas, effectively solves the problems that natural gas hydrate or ice affects the exploitation of the natural gasand that the natural gas exploitation causes environmental pollution and has high energy consumption, effectively eliminates potential safety hazards in the natural gas exploitation, significantly reduces the fixed investment, exploitation cost, energy consumption, self gas consumption, management workload and the like of the exploitation of the natural gas, and is characterized by easy implementation, safety, reliability, wide application range, easy promotion, high economic and environmental benefits and obvious safety benefits.

Description

technical field [0001] The invention relates to an oil and gas extraction method, in particular to a clean natural gas extraction method. Background technique [0002] At present, domestic natural gas mining methods include natural pressure alcohol-containing mining method, natural pressure hydrate inhibitor mining method, natural pressure heating mining method, natural pressure mining method, natural pressure pressurized mining method, surface throttling alcohol-containing mining method, ground Throttling hydrate inhibitor mining method, surface throttling heating mining method, surface throttling mining method, surface throttling surface pressurized mining method, underground throttling alcohol-containing mining method, underground throttling hydrate inhibitor mining method, underground Throttling heating mining method, underground throttling mining method, underground throttling surface pressurized mining method, drainage mining method, air extraction mining method, pumpi...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that when the natural gas is extracted from the ground, some form of water is inevitably extracted at the same time, and these waters are very easy to form gas hydrates under relatively high pressure conditions during the process of mixing and flowing with the natural gas. Commonly known as combustible ice), or when the temperature of natural gas is lower than the freezing point, it is easy to freeze, block the wellbore, pipeline, equipment, etc., seriously affect the natural gas exploitation or storage and transportation, and even make the natural gas exploitation or storage and transportation unable to proceed normally

The disadvantage of this method is that in order to solve the problem of natural gas hydrate blocking the wellbore, pipelines, and equipment during natural gas exploitation, it is necessary to add hydrate inhibitors instead of methanol and other alcohols to inhibit the formation and harm of natural gas hydrate; There are different drawbacks of chemical inhibitors, or they will increase the cost of natural gas extraction, or they are toxic, or they cannot be recovered, or they have other side effects, or they cannot effectively solve the problem of gas hydrate and icing in winter environments, or in the natural gas flow itself. When the temperature is low, the problem of natural gas hydrate and icing cannot be effectively solved, or when the pressure of the natural gas flow itself is high, the problem of natural gas hydrate cannot be effectively solved, so it cannot meet the actual needs of normal natural gas exploitation

The defect of this method is that in order to solve the problems such as natural gas hydrate or ice blocking the wellbore, pipeline, and equipment in natural gas exploitation, it is necessary to use heating methods (such as the method of heating furnace heating) to increase the temperature of the natural gas flow to prevent natural gas hydrate, ice, etc. Form or reduce the hazards of natural gas hydrates and ice; heating requires a large amount of energy, which will lead to increased energy consumption, increased costs, increased fixed investment, complicated processes, and increased management workload and other disadvantages in natural gas mining; and the heating method is easy on the ground. Implementation, it is very difficult to implement inside the wellbore, and it is difficult to solve the problem of gas hydrate plugging the wellbore

The disadvantage of this method is that when the ambient temperature on the ground is low (such as winter), the temperature of the natural gas flow will drop significantly due to the heat dissipation of the gathering pipelines and equipment, and it is very easy to form natural gas hydrate or freeze under low temperature conditions.

The disadvantage of this method is that when the ambient temperature is low (such as winter), the temperature of the pressurized natural gas flow will drop significantly due to the heat dissipation of the gathering pipeline and equipment. Very easy to form gas hydrate, or freeze

The disadvantage of this method is that: due to the high pressure of the natural gas flow in the underground wellbore, if the temperature of the natural gas flow is low, it is easy to form natural gas hydrates to block the wellbore, seriously affecting the normal gas production of natural gas; if the temperature of the natural gas flow in the underground wellbore is high If the natural gas hydrate is not formed at a high temperature, the temperature of the natural gas flow will be greatly reduced due to the throttling and pressure reduction of the ground gathering and transportation after rising to the ground, and it is easy to form natural gas hydrate or ice to block the ground gathering and transportation pipelines, valves, and equipment etc., which seriously affect the normal gathering and transportation of natural gas. For this reason, methanol or other alcohols must be added to the natural gas flow before the natural gas is throttled and depressurized to inhibit the formation and damage of natural gas hydrate or ice.

The disadvantage of this method is that: due to the high pressure of the natural gas flow in the underground wellbore, if the temperature of the natural gas flow is low, it is easy to form natural gas hydrates to block the wellbore, seriously affecting the normal gas production of natural gas; if the temperature of the natural gas flow in the underground wellbore is high If the natural gas hydrate is not formed at a high temperature, the temperature of the natural gas flow will be greatly reduced due to the throttling and pressure reduction of the ground gathering and transportation after rising to the ground, and it is easy to form natural gas hydrate or ice to block the ground gathering and transportation pipelines, valves, and equipment etc., which seriously affect the normal gathering and transportation of natural gas. Therefore, it is necessary to add hydrate inhibitors to the natural gas flow before throttling and reducing the pressure of the natural gas.

The disadvantage of this method is that: due to the high pressure of the natural gas flow in the underground wellbore, if the temperature of the natural gas flow is low, it is easy to form natural gas hydrates to block the wellbore, seriously affecting the normal gas production of natural gas; if the temperature of the natural gas flow in the underground wellbore is high If the natural gas hydrate is not formed at a high temperature, the temperature of the natural gas flow will be greatly reduced due to the throttling and pressure reduction of the ground gathering and transportation after rising to the ground, and it is easy to form natural gas hydrate or ice to block the ground gathering and transportation pipelines, valves, and equipment etc., which seriously affect the normal gathering and transportation of natural gas. Therefore, heating must be used to increase the temperature of natural gas flow before throttling and reducing the pressure of natural gas, so as to prevent the formation of natural gas hydrate and ice or reduce the hazards of natural gas hydrate and ice.

The disadvantage of this method is that the temperature of the natural gas flow will decrease due to throttling on the ground. It is easy to form gas hydrate or ice

The disadvantage of this method is that the temperature of the natural gas flow will decrease due to throttling on the ground. Gas hydrates or ices are easily formed at lower temperatures

The defect of this method is that the temperature of the natural gas flow will be greatly reduced due to the throttling and depressurization process of the natural gas flow in the underground wellbore. If the natural gas flow cannot pass through the wellbore in time to absorb enough When the natural gas flow rises to the ground, if the temperature of the natural gas flow is not high, or the ground environment temperature is low (such as winter), or the natural gas The local heat dissipation of pipelines, equipment, and valves is relatively fast, or the flow of natural gas is throttled at valves, etc., and it is easy to form natural gas hydrate or ice to block ground pipelines, valves, and equipment, which seriously affects the normal gathering and transportation of natural gas. Dosing methanol and other alcohols into the natural gas flow in the wellbore or on the ground

The disadvantage of this method is that the temperature of the natural gas flow will be greatly reduced due to the throttling and depressurization process of the natural gas flow in the underground wellbore. If the natural gas flow cannot pass through the wellbore in time to absorb enough When the natural gas flow rises to the ground, if the temperature of the natural gas flow is not high, or the ground environment temperature is low (such as winter), or the natural gas The local heat dissipation of pipelines, equipment, and valves is relatively fast, or the flow of natural gas is throttled at valves, etc., and it is easy to form natural gas hydrate or ice to block ground pipelines, valves, equipment, etc., seriously affecting the normal gathering and transportation of natural gas. Dosing hydrate inhibitors into natural gas streams in the wellbore or on the ground

The disadvantage of this method is that the temperature of the natural gas flow will be greatly reduced due to the throttling and depressurization process of the natural gas flow in the underground wellbore. If the natural gas flow cannot pass through the wellbore in time to absorb enough When the natural gas flow rises to the ground, if the temperature of the natural gas flow is not high, or the ground environment temperature is low (such as winter), or the natural gas The local heat dissipation of pipelines, equipment, and valves is relatively fast, or the natural gas flow is throttled at valves, etc., and it is easy to form natural gas hydrate or ice to block the ground pipelines, valves, equipment, etc., which seriously affects the normal gathering and transportation of natural gas. Therefore, it is necessary to use Heating methods increase the temperature of natural gas streams

The defect of this method is that the temperature of the natural gas flow will be greatly reduced due to the throttling and depressurization process of the natural gas flow in the underground wellbore. If the natural gas flow cannot pass through the wellbore in time to absorb enough When the natural gas flow rises to the surface, if the temperature of the natural gas flow is not high, the natural gas flow will be released when the surface ambient temperature is low (such as in winter). The flow temperature will further drop due to the heat dissipation of gathering pipelines and equipment, and it is easy to form natural gas hydrate or ice to block ground pipelines, valves, equipment, etc. under low temperature conditions, seriously affecting the normal gathering and transportation of natural gas

The disadvantage of this method is that although the method of throttling and depressurization in the underground wellbore can reduce the pressure of natural gas below the pressure of natural gas hydrate formation and avoid the formation of natural gas hydrate in the wellbore, the process of throttling and depressurization will greatly reduce the If the natural gas flow cannot absorb enough heat from the ground through the wellbore in time, the temperature of the natural gas flow will be lower than the freezing point of water, which will easily form ice to block the wellbore and seriously affect the normal gas production; After the ground, if the temperature of the natural gas flow is lower than the freezing point, or the ground am