A method and system for subsurface infusion of a carbon-containing liquid

Abstract

The present application belongs to the technical field of organic solid waste storage, and particularly discloses a carbon-containing liquid underground perfusion method and system, which perfuses carbon-containing liquid into the ground for solidification and storage, and the perfusion parameter adjustment mode is as follows: when the real-time distance between the upper surface of the perfusion object and the ground is greater than a height threshold, the difference between the pipe bottom pressure and the underground storage pressure is detected in real time; if the difference changes decreases, the perfusion temperature and the perfusion pressure are increased, and the perfusion viscosity is reduced; if the difference changes increases, the perfusion temperature and the perfusion pressure are reduced, and the perfusion viscosity is increased; if the difference changes does not change, the current perfusion parameters are kept. When the distance is not greater than the height threshold, the pipe bottom pressure is detected in real time; if the pressure suddenly changes, the perfusion is stopped; otherwise, the perfusion temperature is increased, and the perfusion pressure is reduced. The present application utilizes the self-polymerization characteristics of carbon-containing liquid in a high-temperature and high-pressure geological environment to gradually polymerize and solidify the carbon-containing liquid, realizes underground storage, and can realize large-scale underground carbon sequestration.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of organic solid waste sequestration, and more particularly relates to a carbon-containing liquid underground injection method and system. BACKGROUND

[0002] With the increase of carbon-containing waste such as plastics, agricultural and forestry waste, and industrial sludge, and the intensification of harm to the ecological environment, there is an urgent need for beneficial and effective carbon source treatment methods, including electrification, fuel conversion, renewable energy, bioenergy, and carbon capture, utilization and storage (CCUS), among which CCUS has great potential. Based on this, carbon-containing waste can also be sequestered underground.

[0003] At present, carbon-containing waste is often converted (such as thermal conversion, liquefaction, etc.) and modulated to generate carbon-containing liquids containing various active functional groups. Carbon-containing liquids have the advantages of easy transportation, high carbon content, high reactivity, and strong fluidity. However, deep wells have the characteristics of low temperature and high pressure, and low temperature and high pressure coking is prone to occur during the injection of carbon-containing liquids underground, affecting the injection effect of carbon-containing liquids. SUMMARY

[0004] In view of the above defects or improvement needs of the prior art, the present application provides a carbon-containing liquid underground injection method and system, which aims to reduce the amount of coking during the injection of carbon-containing liquids and improve the injection effect of carbon-containing liquids.

[0005] To achieve the above-mentioned purpose, according to one aspect of the present application, a carbon-containing liquid underground injection method is provided, comprising the following steps:

[0006] The carbon-containing liquid is pumped into the pipeline as an injection material, and then injected into the underground for solidification and sequestration. The adjustment mode of the injection parameters is as follows:

[0007] When the real-time distance between the upper surface of the injection material and the ground is greater than the preset height threshold, the difference between the pipeline bottom pressure and the underground storage pressure is detected in real time: if the change of the difference decreases, the injection temperature and the injection pressure are increased, and the viscosity of the injection material is reduced; if the change of the difference increases, the injection temperature and the injection pressure are reduced, and the viscosity of the injection material is increased; if the change of the difference is unchanged, the current injection parameters are maintained;

[0008] When the real-time distance between the upper surface of the injection material and the ground is not greater than the preset height threshold, the pipeline bottom pressure is detected in real time: if the pipeline bottom pressure suddenly changes, the injection is stopped; otherwise, the injection temperature is increased, the injection pressure is reduced, and the injection is stopped when the maximum injection height is reached.

[0009] As a further preferred, the pipeline is arranged as follows:

[0010] When the underground storage environment depth is less than or equal to 800 meters, the carbon-containing liquid is pumped into a single pipe independently;

[0011] When the underground storage environment depth is greater than 800 meters, the carbon dioxide is also pumped in simultaneously: if the carbon-containing liquid and the carbon dioxide have a curing time of no more than 12 hours, the carbon-containing liquid and the carbon dioxide are pumped into separate pipes independently; if the carbon-containing liquid and the carbon dioxide have a curing time of more than 12 hours, the carbon-containing liquid and the carbon dioxide are mixed and pumped into the same pipe.

[0012] As a further preferred, the concentration of the carbon dioxide is 0.1% to 100%, and the viscosity of the carbon-containing liquid is 8mm 2 / s to 130mm 2 / s; the injection pressure of all the injections is no less than 8MPa, the injection temperature ranges from 40℃ to 200℃, and the injection flow rate is 150m 3 / h to 250m 3 / h.

[0013] As a further preferred, the height threshold is 500 meters.

[0014] As a further preferred, anti-coking measures are provided during the injection, and the anti-coking measures include at least one of the following: a heat storage cooling jacket structure is provided on the pipe, the pipe material is a material added with an anti-coking substance, and a polymerization inhibitor is added to the carbon-containing liquid.

[0015] As a further preferred, anti-freezing measures are provided during the injection, and the anti-coking measures include at least one of the following: heat preservation through an electric heat tracing pipe, a vacuum jacket is provided on the pipe, and a phase change heat storage material jacket heat preservation structure is provided on the pipe.

[0016] As a further preferred, the injection range of the carbon-containing liquid is below a cap layer having an oil and gas escape prevention effect.

[0017] As a further preferred, the carbon-containing liquid includes a liquid oil containing one or more carbon atoms generated by liquefaction of organic solid waste.

[0018] As a further preferred, the underground storage site includes a waste mineral resource shaft, a waste salt well, and an underground salt phase change heat storage material layer.

[0019] According to another aspect of the present application, a carbon-containing liquid underground injection system is provided, which includes a processor configured to execute the above-described carbon-containing liquid underground injection method.

[0020] Overall, compared with the prior art, the above technical solutions conceived by the present application mainly have the following technical advantages:

[0021] 1. The present application adjusts parameters in the process of perfusion in real time according to the perfusion state: when the perfusion is still less, the perfusion temperature, pressure and viscosity are adjusted through the change of the difference between the pressure at the bottom of the pipeline and the underground storage pressure, so as to weaken the polymerization of aromatic components of carbon-containing liquid in the pipeline perfusion process and reduce the amount of coking in the perfusion process; when the perfusion approaches the ground, the perfusion is stopped by judging the pressure at the bottom of the pipeline, so as to accurately control the perfusion process, reduce coking in the perfusion process, prolong the service life of the pipeline, effectively reduce resource waste and improve the perfusion effect.

[0022] 2. Based on the reaction characteristics of carbon-containing liquid and CO2 and the characteristics of low temperature and high pressure of underground environment, the present application adopts single and double pipe perfusion mode, carries out different forms of coupling of carbon-containing liquid and carbon dioxide, and adopts different perfusion modes according to different perfusion characteristics and different geological environment locations, so as to improve the perfusion effect, realize large-scale low-cost perfusion, store carbon-containing resources for a long time, and reduce resource waste and environmental pollution.

[0023] 3. The present application proposes specific anti-coking measures and anti-freezing measures, which can maintain stable temperature in the conveying process and prevent coking and blockage of the pipeline in the pumping process of carbon-containing liquid.

[0024] 4. The present application can flexibly select the location of underground storage, fully utilize the mined-out area formed after the exploitation of coal, oil and the like, carry out carbon-containing liquid perfusion engineering relying on the original deep well facilities, reduce the cost, and at the same time, solidify the geological structure and prevent the collapse of the mined-out area. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic diagram of the carbon-containing liquid underground perfusion system of the embodiment of the present application;

[0026] Figure 2 is a partial sectional view of the perfusion pipeline of the embodiment of the present application;

[0027] Figure 3 is a schematic diagram of the perfusion parameter adjustment mode of the embodiment of the present application.

[0028] In all the drawings, the same reference signs are used to represent the same elements or structures, wherein: 1 - electric heating wire, 2 - phase change heat storage cooling material. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0030] An embodiment of the present invention provides a method for underground injection of carbon-containing liquid, comprising the following steps:

[0031] S1. Based on fluidity and reactivity, organic solid waste is liquefied and modulated to obtain modulated carbon-containing liquid that is easy to be stored underground;

[0032] S2. The prepared carbon-containing liquid and other injectable materials are pumped into the pipeline through a booster pump and injected underground. Due to the self-polymerization characteristics of the bio-oil in the carbon-containing liquid and the catalytic effect of the underground ore, a polymerization reaction occurs. The aromatic components in the carbon-containing liquid, including those with three rings or less, polymerize to form polycyclic aromatic components, which gradually transfer to a solid state, achieving a solidification effect and realizing carbon and waste solidification. At the same time, the carbon-containing liquid can use its strong surface tension characteristics to form a dense oil film to encapsulate carbon dioxide, allowing it to fully contact the carbon dioxide, which can promote the polymerization reaction. During this process, the pressure at the bottom of the pipeline, the underground storage pressure, and the distance between the injectable material surface and the ground are monitored by data, and key parameters such as injection temperature, injection pressure, and injectable material viscosity are adjusted accordingly.

[0033] S3. After detecting the end-of-injection signal, the injection is stopped, the pipeline vent valve is opened remotely to drain the material in the pipe, and the injection device is retrieved.

[0034] Furthermore, such as Figure 3 As shown, the start-up, parameter adjustment, and shutdown of the grouting are determined based on the pressure difference between the bottom of the pipeline and the underground storage pressure, as well as the distance between the grout surface and the ground surface.

[0035] When the real-time distance between the upper surface of the injection material and the ground is greater than 500 meters, the difference between the pressure at the bottom of the pipeline and the underground storage pressure is monitored in real time: if the change in this difference decreases, the injection temperature and injection pressure are increased, and the viscosity of the injection material is decreased; if the change in this difference increases, the injection temperature and injection pressure are decreased, and the viscosity of the injection material is increased; if the change in this difference remains unchanged, the current injection parameters are maintained (viscosity adjustment is only for carbon-containing liquids);

[0036] When the distance between the upper surface of the grout and the ground is no more than 500 meters, the pressure at the bottom of the pipeline is monitored in real time. If the pressure at the bottom of the pipeline changes abruptly, grouting is stopped. Otherwise, the grouting temperature is increased and the grouting pressure is decreased until the maximum grouting height that can be accommodated is reached, at which point grouting is stopped.

[0037] Furthermore, geophysical monitoring technologies, including but not limited to 4D seismic technology, geophysical logging technology, and electromagnetic monitoring technology, are used to investigate information such as stratum depth, fractures, geological temperature, and geological pressure, thereby:

[0038] If the underground storage environment is at a depth of ≤800 meters, then the carbon-containing liquid should be pumped in through a single pipe.

[0039] If the underground storage environment depth > 800 meters, and in the simulation of deep underground environment of curing test, carbon-containing liquid and CO2 curing time ≤ 12 hours, carbon-containing liquid and CO2 are pumped into by independent single pipe respectively;

[0040] If the underground storage environment depth > 800 meters, and in the simulation of deep underground environment of curing test, carbon-containing liquid and CO2 curing time > 12 hours, carbon-containing liquid and CO2 are pumped into by the same single pipe mixed.

[0041] Further, the perfusion pipeline has anti-coking measures and anti-freezing measures; the anti-coking measures include at least one of the following measures: pipeline phase change material heat storage cooling jacket structure, pipeline material added with anti-coking material, carbon-containing liquid added with polymerization inhibitor, etc.; the anti-freezing measures include at least one of the following measures: electric heating pipeline insulation technology, vacuum jacket, phase change heat storage material jacket insulation structure, etc.

[0042] Specifically, as shown in Figure 2 The pipeline is provided with a detachable jacket structure, the jacket is placed with phase change heat storage cooling material 2, and the pipeline has electric heating pipeline insulation technology, and an electric heating wire 1 is further arranged outside the jacket to keep the temperature stable during transportation. The pipeline material is a special pipeline added with anti-coking material, which can reduce or even eliminate the coking of carbon-containing material. At the same time, the anti-coking material has carbon-containing material compatibility, which can avoid blockage of the pipeline caused by peeling due to pressure change in the pipeline; when the pipeline pressure changes suddenly, it means that the carbon-containing liquid in the pipeline cokes, and the viscosity of the carbon-containing material needs to be changed, including but not limited to adding free radical polymerization inhibitor and other substances.

[0043] Further, the gas concentration of carbon dioxide is 0.1% to 100%, and the viscosity of the carbon-containing liquid is 8mm 2 / s to 130mm 2 / s; the perfusion pressure of carbon dioxide and carbon-containing liquid is not less than 8MPa, the critical pressure of CO2 is 7.38MPa, and the pressure of 800 meters underground is generally 8MPa; the perfusion temperature range is 40℃ to 200℃, the critical temperature of CO2 is 31.1℃, the carbon-containing liquid is not easy to freeze and coke, and the transportation process is good; the perfusion flow rate is 150m 3 / h to 250m 3 / h, which is not prone to low-temperature high-pressure coking.

[0044] Specifically, the underground storage site includes but is not limited to abandoned mineral resource shaft, abandoned salt well, underground salt phase change heat storage material layer, etc.; the injection range is below the cap layer with the function of preventing oil and gas from escaping, to prevent harmful substances from being released during pumping of the perfusion material. The carbon-containing liquid includes liquid oil containing one or more carbon atoms generated by liquefaction of organic solid waste such as biomass, solid waste, medical waste, etc.

[0045] A carbon-containing liquid and carbon dioxide underground perfusion system, as shown in the figure, comprises a liquid supply subsystem, a gas supply subsystem, a pipeline subsystem, an underground storage subsystem and a data monitoring and control subsystem, wherein: Figure 1

[0046] The liquid supply subsystem comprises a modulated carbon-containing liquid storage tank and a liquid injection pump, which are connected to the pipeline subsystem;

[0047] The gas supply subsystem comprises a carbon dioxide cylinder and a gas injection pump, which are connected to the pipeline subsystem;

[0048] The pipeline subsystem is connected to the underground storage subsystem to inject the modulated carbon-containing liquid and carbon dioxide into the underground storage system;

[0049] The underground storage subsystem is a suitable, well-sealed abandoned mine, abandoned salt well or underground layer of saline phase change thermal storage material suitable for perfusion;

[0050] The data monitoring and control subsystem is connected to the gas supply subsystem, the liquid supply subsystem and the pipeline subsystem respectively through sensors to realize intelligent control of key parameters such as perfusion speed, perfusion temperature, perfusion pressure and perfusion viscosity.

[0051] The following is a specific example:

[0052] Example 1

[0053] (a) Use geophysical monitoring techniques, including but not limited to four-dimensional seismic techniques, geophysical logging techniques, electromagnetic monitoring techniques, etc. to explore information such as stratum depth, fractures, geological temperature and geological pressure, and select a storage environment with a stratum depth greater than 800m;

[0054] The carbon-containing liquid obtained by rapid pyrolysis of plastic PBT at 300℃ is subjected to a simulated underground environment curing experiment, the temperature is 200℃, the pressure is 15MPa, and the curing time is less than 12h, and it is found that the carbon-containing liquid is suitable for single-pipe perfusion;

[0055] (b) independently perfuse the carbon-containing liquid and CO2 in separate pipes, the pipeline is a phase change thermal storage material jacketed pipeline with electric heating strips, the perfusion temperature is 200℃, the perfusion pressure is 15MPa, and the perfusion flow rate is 150m 3 / h;

[0056] (c) Feedback through the data monitoring device, stop perfusion when the underground environment pressure changes sharply; little coking occurs during perfusion, and no harmful gases or substances are released.

[0057] Example 2

[0058] ​(a) using geophysical monitoring techniques, including but not limited to four-dimensional seismic technology, geophysical logging technology, electromagnetic monitoring technology, etc. to explore information such as stratum depth, fracture, geological temperature, and geological pressure, and select a storage environment with a stratum depth greater than 800 m;

[0059] The carbon-containing liquid obtained by rapid pyrolysis of corn stalks at 500°C was subjected to a simulated underground environment solidification experiment at a temperature of 120°C and a pressure of 10 MPa for more than 12 h, and it was found that the carbon-containing liquid was suitable for single-pipe perfusion.

[0060] (b) The carbon-containing liquid and CO2 were mixed and pumped into the same single pipe, and the pipe was a phase change heat storage material jacketed pipe with an electric heating strip, the perfusion temperature was 120°C, the perfusion pressure was 10 MPa, and the perfusion flow rate was 200 m 3 / h;

[0061] (c) Feedback through a data monitoring device, stop perfusion when the underground environment pressure changes sharply; little coking occurs during perfusion, and no harmful gases or substances are released.

[0062] Example 3

[0063] (a) using geophysical monitoring techniques, including but not limited to four-dimensional seismic technology, geophysical logging technology, electromagnetic monitoring technology, etc. to explore information such as stratum depth, fracture, geological temperature, and geological pressure, and select a storage environment with a stratum depth less than 800 m;

[0064] The carbon-containing liquid obtained by rapid pyrolysis of French plane tree leaves at 400°C was subjected to a simulated underground environment solidification experiment at a temperature of 40°C and a pressure of 8 MPa for more than 12 h, and it was found that the carbon-containing liquid was suitable for single-pipe perfusion.

[0065] (b) The carbon-containing liquid was pumped into a single pipe, and the pipe was a phase change heat storage material jacketed pipe with an electric heating strip, the perfusion temperature was 40°C, the perfusion pressure was 8 MPa, and the perfusion flow rate was 250 m 3 / h;

[0066] (c) Feedback through a data monitoring device, stop perfusion when the underground environment pressure changes sharply; little coking occurs during perfusion, and no harmful gases or substances are released.

[0067] Those skilled in the art will readily understand that the above description is only a preferred embodiment of the present application and is not intended to limit the present application, and any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method of subterranean infusion of a carbon-containing liquid, characterized by, The method comprises the following steps: The carbon-containing liquid is pumped into the pipeline as a perfusion, and then perfused into the ground for solidification and storage, and the perfusion parameters are adjusted as follows: When the real-time distance between the upper surface of the perfusion and the ground is greater than the preset height threshold, the difference between the pipeline bottom pressure and the underground storage pressure is detected in real time: if the change of the difference decreases, the perfusion temperature and perfusion pressure are increased, and the perfusion viscosity is reduced; if the change of the difference increases, the perfusion temperature and perfusion pressure are reduced, and the perfusion viscosity is increased; if the change of the difference is unchanged, the current perfusion parameters are maintained; When the real-time distance between the upper surface of the perfusion and the ground is not greater than the preset height threshold, the pipeline bottom pressure is detected in real time: if the pipeline bottom pressure suddenly changes, the perfusion is stopped; otherwise, the perfusion temperature is increased, the perfusion pressure is reduced, and the perfusion is stopped when the maximum perfusion height is reached; The pipeline is arranged as follows: When the underground storage environment depth is less than or equal to 800 meters, the carbon-containing liquid is pumped into a single pipe; When the underground storage environment depth is greater than 800 meters, carbon dioxide is also pumped in: if the solidification time of the carbon-containing liquid and the carbon dioxide is not greater than 12 hours, the carbon-containing liquid and the carbon dioxide are independently pumped into separate pipes; if the solidification time of the carbon-containing liquid and the carbon dioxide is greater than 12 hours, the carbon-containing liquid and the carbon dioxide are mixed and pumped into the same pipeline.

2. The carbonaceous liquid underground infusion method of claim 1, wherein, The concentration of carbon dioxide is 0.1%~100%, the viscosity of carbon-containing liquid is 8mm 2 / s~130mm 2 / s; the perfusion pressure of all perfusion is not less than 8MPa, the perfusion temperature range is 40℃~200℃, the perfusion flow is 150 m 3 / h~250 m 3 / h.

3. The carbonaceous liquid underground infusion method of claim 1, wherein, The height threshold is 500 meters.

4. The carbonaceous liquid underground infusion method of claim 1 wherein, Anti-coking measures are provided during perfusion, and the anti-coking measures include at least one of arranging a heat storage cooling jacket structure on the pipeline, using a material added with an anti-coking substance as the pipeline material, and adding a polymerization inhibitor to the carbon-containing liquid.

5. The carbonaceous liquid underground infusion method of claim 1 wherein, Anti-freezing measures are provided during perfusion, and the anti-coking measures include at least one of using an electric heat tracing pipeline for heat preservation, arranging a vacuum jacket on the pipeline, and arranging a phase change heat storage material jacket heat preservation structure on the pipeline.

6. The carbonaceous liquid underground infusion method of claim 1 wherein, The injection range of the carbon-containing liquid is below a cap layer that prevents oil and gas from escaping.

7. The carbonaceous liquid underground infusion method of claim 1 wherein, The carbon-containing liquid includes a liquid oil containing one or more carbon atoms generated by liquefaction of organic solid waste.

8. A carbonaceous liquid underground infusion method according to any one of claims 1 to 7, wherein The underground storage site includes abandoned mineral resource shafts, abandoned salt wells, and underground salt phase change heat storage material layers.

9. A carbonaceous liquid underground perfusion system, characterized by, A processor is included for performing the carbon-containing liquid underground perfusion method according to any one of claims 1-8. A processor is included for performing the carbon-containing liquid underground perfusion method according to any one of claims 1-8.

Images