Crude oil transportation viscosity reduction system based on gaseous alcohol substance injection and oil extraction system
By injecting gaseous alcohols into crude oil pipelines and utilizing a pressurized vaporization system to generate microturbulence and co-solvent effects, the high energy consumption and environmental risks in crude oil transportation in cold regions are solved, achieving a high-efficiency, low-energy viscosity reduction effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TIBET KANGSHENG ENERGY DEV CO LTD
- Filing Date
- 2025-06-10
- Publication Date
- 2026-04-21
AI Technical Summary
Existing crude oil viscosity reduction technologies suffer from high energy consumption, high cost, and environmental risks in cold regions. In particular, during crude oil transportation in high-latitude deep-sea areas, heat dissipation from the pipe wall causes a sharp increase in crude oil viscosity, leading to complex rheological problems such as increased flow resistance and wax crystal precipitation.
By injecting gaseous alcohols into crude oil pipelines, a pressurized vaporization system is used to pressurize and vaporize liquid alcohols and inject them into crude oil. This generates microturbulence that disrupts the wax crystal structure. After the alcohols mix with crude oil, they condense and release latent heat, raising the temperature and forming a co-solvent system that reduces viscosity.
It achieves low energy consumption and low carbon emissions in the crude oil transportation process, with a viscosity reduction effect of 70-95%. Alcohols can be recycled and reused, reducing costs and avoiding pollution from chemical additives.
Smart Images
Figure CN224150702U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of crude oil transportation and oil production systems, specifically to a crude oil transportation viscosity reduction system based on the injection of gaseous alcohols, and an oil production system. Background Technology
[0002] Oilfield development includes onshore oil extraction and underwater oil extraction.
[0003] Currently, most conventional oil fields are in the late stages of exploitation. With the reduction of conventional crude oil reserves, offshore oil field exploitation is gradually showing a trend of development from shallow sea to deep sea. The exploration and development of offshore oil fields is increasing, such as offshore oil fields in high-latitude cold regions.
[0004] After oilfield extraction, crude oil needs to be transported to its destination via a crude oil transportation system. However, in cold regions, temperature has a significant impact on the viscosity of crude oil during both extraction and transportation. For example, in high-latitude cold regions (such as high-latitude deep-sea areas), crude oil is transported via long-distance pipelines. During transportation, the temperature of the crude oil gradually decreases due to heat dissipation from the pipe walls. Especially when the temperature drops to 5-15°C, the intermolecular forces of the crude oil significantly increase, and its dynamic viscosity may increase exponentially. Taking typical heavy crude oil as an example, the viscosity can increase by 2-3 times for every 10°C decrease in temperature. When the viscosity exceeds 3000 MPa.s, the Reynolds number of pipeline flow will fall below the critical value, leading to a sharp increase in frictional resistance under laminar flow conditions. This deterioration of rheological properties not only increases pumping power requirements by 40%-60%, but also causes complex rheological problems such as wax crystal precipitation and gum deposition, which can lead to pipe clogging accidents in severe cases.
[0005] To address the impact of low temperatures on crude oil viscosity during transportation, traditional solutions include:
[0006] ① Heating at heating stations: Gas-fired or electric heating stations are installed every 50-80 km along the pipeline to raise the crude oil temperature to the design value. This method is energy-intensive and requires repeated heating.
[0007] ② Adding chemical viscosity reducers: By adding a certain concentration of polymer or surfactant viscosity reducers, the apparent viscosity of crude oil can be reduced, but this method is costly and may contaminate the crude oil.
[0008] ③ Dilution method: Adding a certain proportion of light oil to crude oil can lower the pour point of the mixed oil by 15-25℃, but this method has a general viscosity reduction effect and requires subsequent separation treatment.
[0009] Therefore, existing crude oil transportation viscosity reduction technologies have problems such as poor economic efficiency or environmental risks. Under the dual carbon background, there is an urgent need to find a method for crude oil transportation viscosity reduction that is efficient, low in energy consumption, and low in carbon emissions. Utility Model Content
[0010] The main purpose of this invention is to provide a crude oil transportation viscosity reduction system based on the injection of gaseous alcohols, as well as an oil production system, which aims to solve the problems of poor economic efficiency or environmental risks of existing crude oil transportation viscosity reduction technologies.
[0011] To achieve the above objectives, the present invention proposes a crude oil transportation viscosity reduction system based on the injection of gaseous alcohols for connection to a crude oil transportation pipeline, thereby injecting gaseous alcohols into the crude oil transportation pipeline; the crude oil transportation viscosity reduction system includes a crude oil transportation pipeline injection section for connection to the crude oil transportation pipeline, and at least one injection hole is opened on the crude oil input pipeline injection section; each injection hole is used to connect an injection device, and the injection device includes a pressurized vaporization system and an injection system;
[0012] The inlet side of the pressurized vaporization system is used to connect with the alcohol export pipeline, and the outlet side of the pressurized vaporization system is used to connect with the inlet side of the injection system.
[0013] The injection system is used to connect to the injection section of the crude oil transport pipeline through the corresponding injection hole, and the outlet side of the injection system is used to inject gaseous alcohols into the injection section of the crude oil transport pipeline.
[0014] The inlet side and the outlet side of the crude oil pipeline injection section are respectively used to connect the crude oil pipeline.
[0015] Optionally, the pressurized vaporization system includes a storage tank, a pressurized pump, a vaporizer, and a superheater connected in sequence;
[0016] The inlet of the storage tank is connected to the external pipeline for the alcohol substance, the outlet of the storage tank is connected to the inlet of the pressurizing pump, the outlet of the pressurizing pump is connected to the inlet of the vaporizer, the outlet of the vaporizer is connected to the inlet of the superheater, and the outlet of the superheater is connected to the inlet of the injection system.
[0017] Optionally, a pressure detection unit, a first temperature detection unit, and a safety pressure relief unit are respectively installed on the pipeline between the outlet of the pressurizing pump and the vaporizer; the pressure relief outlet of the safety pressure relief unit is connected to the pressure relief port of the storage tank.
[0018] Optionally, a second temperature detection unit is provided on the pipeline between the outlet of the vaporizer and the inlet of the superheater; and / or, a flow regulation unit and a flow detection unit are respectively provided on the pipeline from the outlet of the superheater to the inlet of the injection system.
[0019] Optionally, the injection system includes a nozzle, a distribution pipe, and a connecting part;
[0020] The inlet of the connector is used to communicate with the outlet of the pressurized vaporization system, and the connector and the distribution pipe are connected by the connecting part; the distribution pipe is provided with distribution holes for injecting gaseous alcohols into the injection section of the crude oil delivery pipeline.
[0021] Optionally, multiple rings of distribution holes are formed along the length of the distribution tube; each ring of distribution holes is arranged axially around the distribution tube; each ring of distribution holes includes multiple distribution holes.
[0022] Optionally, the crude oil delivery pipeline injection section includes a Venturi mixer, and the distribution pipe is disposed within the straight section of the Venturi mixer to mix the gaseous alcohol with the crude oil in the crude oil delivery pipeline injection section through the Venturi mixer.
[0023] Optionally, the crude oil delivery pipeline injection section further includes a first viscometer located before the inlet of the Venturi mixer and a second viscometer located after the outlet of the Venturi mixer.
[0024] Optionally, the alcohol is any one of methanol, ethanol, and propanol.
[0025] To achieve the above objectives, this utility model also proposes an oil production system, including subsea oil production equipment and the crude oil transportation and viscosity reduction system based on the injection of gaseous alcohols, wherein the crude oil extracted by the subsea oil production equipment is transported through a crude oil transportation pipeline; the subsea oil production equipment includes drilling equipment.
[0026] In this invention, liquid alcohols are pressurized and vaporized using a pressurized vaporization system to reach a certain temperature. The gaseous alcohols are then uniformly injected into the crude oil via an injection system. During gas-phase injection, micro-turbulence is generated, disrupting the wax crystal network structure. Furthermore, after the high-temperature alcohols mix with the crude oil, the alcohols cool down and eventually condense, releasing latent heat of condensation and causing the crude oil temperature to rise by 5-15°C. Simultaneously, the alcohols form a co-solvent system with C10-C20 alkanes in the crude oil, resulting in a viscosity reduction of 70-95%. This solution uses a relatively small amount of alcohols, which can be recovered in subsequent processes. Therefore, this invention helps solve the problems of high energy consumption and high carbon emissions during crude oil transportation. Attached Figure Description
[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0028] Figure 1 A schematic diagram of the crude oil transport viscosity reduction system for injecting alcohols into the present invention;
[0029] Figure 2 This is a schematic diagram of the pressurized vaporization system in this utility model;
[0030] Figure 3 This is a schematic diagram of the injection system in this utility model;
[0031] Figure 4 This is a schematic diagram of the crude oil delivery pipeline injection section in this utility model.
[0032] Explanation of icon numbers:
[0033] 01-Pressurized vaporization system; 02-Injection system; 03-Crude oil pipeline injection section;
[0034] 101-Storage tank; 102-Pressure pump; 103-Pressure detection unit; 104-Safety pressure relief unit; 105-First temperature detection unit; 106-Vaporizer; 107-Second temperature detection unit; 108-Superheater; 109-Flow regulation unit; 110-Flow detection unit;
[0035] 201-Connecting pipe; 202-Connecting part; 203-Distribution pipe; 204-Distribution hole;
[0036] 301 - First viscometer; 302 - Venturi mixer; 303 - Second viscometer; 304 - Crude oil pipeline;
[0037] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0039] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0040] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0041] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0042] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0043] This invention proposes a crude oil transportation viscosity reduction system based on the injection of gaseous alcohols.
[0044] Please refer to Figures 1 to 4 To achieve the above objectives, the present invention proposes a crude oil transportation viscosity reduction system based on the injection of gaseous alcohols for connection to a crude oil transportation pipeline 304, for injecting gaseous alcohols into the crude oil transportation pipeline 304; the crude oil transportation viscosity reduction system includes a crude oil transportation pipeline injection section 03 for connection to the crude oil transportation pipeline 304, and at least one injection hole is opened on the crude oil input pipeline injection section; each injection hole is used to connect an injection device, and the injection device includes a pressurized vaporization system 01 and an injection system 02;
[0045] The inlet side of the pressurized vaporization system 01 is used to connect with the alcohol substance export pipeline, and the outlet side of the pressurized vaporization system 01 is used to connect with the inlet side of the injection system 02.
[0046] The injection system 02 is used to connect to the crude oil delivery pipeline injection section 03 through the corresponding injection hole, and the outlet side of the injection system 02 is used to inject gaseous alcohols into the crude oil delivery pipeline injection section 03.
[0047] The inlet side and the outlet side of the crude oil pipeline injection section 03 are respectively used to connect to the crude oil pipeline 304.
[0048] Furthermore, industrial methanol with a purity of 95% or higher is preferred among the alcohols used, but ethanol and propanol can also be used as substitutes. Of course, other alcohols such as butanol and pentanol can also be used.
[0049] In this invention, liquid alcohols are pressurized and vaporized by a pressurized vaporization system 01 to reach a certain temperature. The gaseous alcohols are then uniformly injected into the crude oil via an injection system 02. During gas-phase injection, micro-turbulence is generated, disrupting the wax crystal network structure. Furthermore, after the high-temperature alcohols mix with the crude oil, the alcohols cool down and eventually condense, releasing latent heat of condensation and causing the crude oil temperature to rise by 5-15°C. Simultaneously, the alcohols form a co-solvent system with C10-C20 alkanes in the crude oil, resulting in a viscosity reduction of 70-95%. This solution uses a relatively small amount of alcohols, which can be recovered in subsequent processes. Therefore, this invention helps solve the problems of high energy consumption and high carbon emissions during crude oil transportation.
[0050] Specifically, gaseous alcohols are injected into crude oil pipeline 304. The latent heat of condensation and sensible heat of the gaseous alcohols raise the temperature of the crude oil, thereby reducing viscosity during transport. Simultaneously, during crude oil transport, the crude oil is fluid, and the injection of alcohols in a specific manner results in rapid heat transfer and mixing with the crude oil. This achieves a flow pattern improvement and accelerated viscosity reduction in both processes. Furthermore, this invention utilizes the similarity-like solubility of the alcohols and the organic matter in the crude oil to further reduce viscosity. Thus, this invention achieves a multi-faceted, composite viscosity reduction effect. Moreover, this invention eliminates the need for a heating station during viscosity reduction, achieving low energy consumption; it also eliminates the need for chemical viscosity reducers, reducing costs and preventing crude oil contamination. Furthermore, this invention does not require the addition of light oil, thus eliminating the need for subsequent separation treatment. The injected alcohols, transported with the crude oil to the end of the pipeline, can be recovered at a refinery and sold as a byproduct, or they can be recovered and transported back to various injection points in the pipeline for reuse. Therefore, the technical solution of this utility model achieves efficient viscosity reduction through the three-level synergistic effect of phase change heat transfer, similar solubility and flow pattern improvement. It is beneficial to solve the problems of poor economic efficiency or environmental risks of existing crude oil transportation viscosity reduction technologies. Under the dual carbon background, it realizes the high efficiency, low energy consumption and low carbon emissions of viscosity reduction method in crude oil transportation.
[0051] The alcohols used in this invention have a simple composition, are readily available, have a mature production process, and are relatively inexpensive. Because alcohols have a low boiling point (for example, methanol has a boiling point of 64.7°C), they can be repeatedly used with low energy consumption in subsequent purification stages. This method is suitable for viscosity reduction scenarios in long-distance crude oil pipelines in cold regions.
[0052] Specifically, the present invention can employ a multi-stage crude oil transport viscosity reduction system for crude oil transport pipeline 304. Based on the viscosity range, composition, and local meteorological conditions of the transported crude oil, an injection point is set every 50-150 km in crude oil transport pipeline 304.
[0053] Please refer to Figure 1 For each crude oil pipeline injection section 03, one or more injection devices can be installed (e.g., Figure 1 There are 3 injection devices installed in the middle, and each injection device is connected to the crude oil delivery pipeline injection section 03 through a corresponding injection hole.
[0054] As an optional embodiment, the injection hole can be opened at the top of the injection section 03 of the crude oil delivery pipeline.
[0055] The preferred pressure range for injecting alcohols is 0.5-7.9 MPa. The alcohols are heated to raise their temperature and vaporize, reaching superheated steam; the temperature range is 120-239℃. If the crude oil viscosity is too high or its composition is complex, the injection temperature and pressure of the alcohols can reach supercritical parameters.
[0056] Injection system 02 is used to ensure uniform dispersion of vaporized alcohols by injecting them evenly into the oil pipeline at a certain flow rate.
[0057] The crude oil pipeline injection section 03 is used to achieve effective mixing of alcohols and crude oil. The crude oil pipeline injection section 03 is located at the injection point specified by the crude oil pipeline 304. The top of the injection section has an opening to connect with the injection system 02.
[0058] Optionally, the pressurized vaporization system 01 includes a storage tank 101, a pressurized pump 102, a vaporizer 106, and a superheater 108 connected in sequence.
[0059] The inlet of the storage tank 101 is connected to the external pipeline for the alcohol substance, the outlet of the storage tank 101 is connected to the inlet of the pressurizing pump 102, the outlet of the pressurizing pump 102 is connected to the inlet of the vaporizer 106, the outlet of the vaporizer 106 is connected to the inlet of the superheater 108, and the outlet of the superheater 108 is connected to the inlet of the injection system 02.
[0060] Specifically, liquid alcohols are stored in storage tank 101 through an alcohol export pipeline. The liquid alcohols are then pressurized to 0.5 to 7.9 MPa by a pressurizing pump 102 and sent to vaporizer 106 through a pipeline. In vaporizer 106, the alcohols are heated and completely vaporized. The vaporized alcohols then enter superheater 108, where the temperature of the alcohol vapor is raised to 120 to 239°C before being sent to the inlet pipe 201 of injection system 02.
[0061] Optionally, a pressure detection unit 103, a first temperature detection unit 105, and a safety pressure relief unit 104 are respectively installed on the pipeline between the outlet of the pressurizing pump 102 and the vaporizer 106; the pressure relief outlet of the safety pressure relief unit 104 is connected to the pressure relief port of the storage tank 101.
[0062] Optionally, a second temperature detection unit 107 is provided on the pipeline between the outlet of the vaporizer 106 and the inlet of the superheater 108.
[0063] Optionally, a flow regulating unit 109 and a flow detection unit 110 are respectively installed on the pipeline from the outlet of the superheater 108 to the inlet of the injection system 02. Specifically, the flow regulating unit 109 is a regulating valve, and the flow detection unit 110 is a flow meter. The injection system 02 adjusts the opening degree through the regulating valve.
[0064] Specifically, the booster pump 102 is preferably a variable frequency pump, and the speed of the booster pump 102 is controlled by the pressure detection unit 103 and the flow detection unit 110 on the outlet pipeline.
[0065] Optionally, the injection system 02 includes a pipe 201, a distribution pipe 203, and a connecting part 202;
[0066] The inlet of the connecting pipe 201 is used to connect with the outlet of the pressurized vaporization system 01 (specifically the outlet of the superheater 108). The connecting pipe 201 and the distribution pipe 203 are connected through the connecting part 202. The distribution pipe 203 is provided with a distribution hole 204 for injecting gaseous alcohols into the crude oil delivery pipeline injection section 03.
[0067] In one specific embodiment, the connecting part 202 can be a reinforcing plate, and the injection system 02 is welded to the connecting pipe 201 and the distribution pipe 203 through the reinforcing plate.
[0068] Specifically, the alcohol vapor from the pressurized vaporization system 01 is regulated by the flow regulating unit 109 and then enters the injection system 02 through the pipeline. The gaseous alcohol enters the distribution pipe 203 through the connecting pipe 201 and is injected into the crude oil at a high flow rate through the distribution holes 204 evenly arranged on the distribution pipe 203.
[0069] Optionally, the volumetric flow rate of the injected alcohol is 0.5%-8% of the crude oil volumetric flow rate, specifically calculated using the following formula:
[0070] ;
[0071] Where Q is the injection flow rate of alcohol, in meters. 3 / s; D is the pipe diameter, in meters; u is the crude oil flow rate, in meters per second; Crude oil density, in kg / m³ 3 ; This refers to the density of liquid alcohols, expressed in kg / m³. 3 ; , These represent the crude oil viscosity before and after injection, in MPa.s, and k is a correction factor ranging from 0.02 to 0.06.
[0072] Preferably, the flow rate of alcohols is controlled at 0.8-2.0 m / s during the initial injection stage and at 2.0-3.0 m / s during the static mixing stage. For high-viscosity crude oil (above 200 MPa.s), the flow rate can be controlled up to 3.0-4.0 m / s.
[0073] Optionally, multiple rings of distribution holes 204 are formed along the length of the distribution pipe 203; each ring of distribution holes 204 is arranged axially around the distribution pipe 203; each ring of distribution holes 204 includes multiple distribution holes 204.
[0074] Furthermore, multiple rings of distribution holes 204 are uniformly formed along the length of the distribution pipe 203; each ring of distribution holes 204 is uniformly arranged around the axial direction of the distribution pipe 203.
[0075] Specifically, a ring of distribution holes 204 can be provided every 30 to 50 mm along the length of the distribution pipe 203, and each distribution pipe 203 can be provided with 20 to 25 rings of distribution holes 204.
[0076] Optionally, the diameter of the distribution holes 204 of the injection system 02 is 8 to 14 mm.
[0077] Of course, the spacing of each ring of distribution holes 204 is not limited to this, and the aperture of the distribution holes 204 is not limited to this either. Other spacings and other apertures are also included within the protection scope of this utility model.
[0078] Optionally, the crude oil pipeline injection section 03 includes a Venturi mixer 302, and the distribution pipe 203 is disposed within the straight section of the Venturi mixer 302 to mix the gaseous alcohol with the crude oil in the crude oil pipeline injection section 03 through the Venturi mixer 302.
[0079] Optionally, the crude oil delivery pipeline injection section 03 further includes a first viscometer 301 disposed before the inlet of the Venturi mixer 302, and a second viscometer 303 disposed after the outlet of the Venturi mixer 302.
[0080] Specifically, the distance between the first viscometer 301 and the Venturi mixer 302 is less than the distance between the second viscometer 303 and the Venturi mixer 302. For example, the first viscometer 301 is at least 2m away from the Venturi mixer 302, and the second viscometer 303 is at least 20m away from the Venturi mixer 302.
[0081] Preferably, the first viscometer 301 and the second viscometer 303 can be rotational viscometers.
[0082] To achieve the above objectives, this utility model also proposes an oil production system, including subsea oil production equipment and the crude oil transportation and viscosity reduction system based on the injection of gaseous alcohols. The crude oil extracted by the subsea oil production equipment is transported through crude oil transportation pipeline 304. The subsea oil production equipment includes drilling equipment.
[0083] The subsea oil production equipment can be subsea oil production equipment, such as deep-sea oil production equipment. Therefore, the drilling equipment is deep-sea oil drilling equipment.
[0084] Of course, the crude oil transportation viscosity reduction system of this utility model can be used not only for crude oil transportation in underwater oil production equipment, but also for crude oil transportation in onshore oil production equipment.
[0085] In summary, this utility model, through the gas pressurization vaporization system 01, the injection system 02, and the crude oil transportation pipeline injection section 03, combines heat conduction and molecular dissolution mechanisms, breaking through the limitations of single physical / chemical viscosity reduction. It saves more than 40% energy compared to traditional heating methods, increases the viscosity reduction rate by 2-3 times, and allows alcohols to be recycled with a recovery rate of over 92%, effectively reducing the cost of crude oil transportation.
[0086] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made under the concept of this utility model using the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.
Claims
1. A gaseous alcohol-based injection system for crude oil viscosity reduction, characterized in that, The application relates to a crude oil transportation viscosity reduction system for accessing a crude oil transportation pipeline to inject gaseous alcohol into the crude oil transportation pipeline; the crude oil transportation viscosity reduction system comprises a crude oil transportation pipeline injection section for accessing the crude oil transportation pipeline, at least one injection hole is arranged on the crude oil transportation pipeline injection section, each injection hole is connected with an injection device, the injection device comprises a pressurized vaporization system and an injection system. An inlet side of the pressurized vaporization system is connected with an alcohol outlet pipeline, and an outlet side of the pressurized vaporization system is connected with an inlet side of the injection system. The injection system is connected with the crude oil transportation pipeline injection section through the corresponding injection hole, and an outlet side of the injection system is used for injecting gaseous alcohol into the crude oil transportation pipeline injection section. An inlet side of the crude oil transportation pipeline injection section and an outlet side of the crude oil transportation pipeline injection section are respectively connected with a crude oil transportation pipeline.
2. The gaseous alcohol-based injection system for crude oil viscosity reduction according to claim 1, wherein The pressurized vaporization system comprises a storage tank, a pressurized pump, a vaporizer and a superheater which are sequentially connected. An inlet of the storage tank is connected with the alcohol outlet pipeline, an outlet of the storage tank is connected with an inlet of the pressurized pump, an outlet of the pressurized pump is connected with an inlet of the vaporizer, an outlet of the vaporizer is connected with an inlet of the superheater, and an outlet of the superheater is connected with an inlet of the injection system.
3. The gaseous alcohol-based crude oil viscosity reduction system of claim 2, wherein, A pressure detection unit, a first temperature detection unit and a safety pressure relief unit are respectively arranged on a pipeline between the outlet of the pressurized pump and the vaporizer, and a pressure relief outlet of the safety pressure relief unit is connected with a pressure relief port of the storage tank.
4. The gaseous alcohol-based crude oil viscosity reduction system for injection of claim 2, wherein, A second temperature detection unit is arranged on a pipeline between the outlet of the vaporizer and the inlet of the superheater, and a flow regulation unit and a flow detection unit are respectively arranged on a pipeline between the outlet of the superheater and the inlet of the injection system.
5. The gaseous alcohol-based injection system for crude oil viscosity reduction according to claim 1, wherein The injection system comprises a connecting pipe, a distribution pipe and a connecting part. An inlet of the connecting pipe is connected with the outlet of the pressurized vaporization system, the connecting pipe and the distribution pipe are connected through the connecting part, and the distribution pipe is provided with distribution holes for injecting gaseous alcohol into the crude oil transportation pipeline injection section.
6. The gaseous alcohol-based crude oil viscosity reduction system of claim 5, wherein, A plurality of circles of the distribution holes are arranged along a length direction of the distribution pipe, each circle of the distribution holes is arranged around an axial direction of the distribution pipe, and each circle of the distribution holes comprises a plurality of the distribution holes.
7. The gaseous alcohol-based crude oil viscosity reduction system of claim 5, wherein, The crude oil transportation pipeline injection section comprises a Venturi mixer, and the distribution pipe is arranged in a straight section of the Venturi mixer so that the gaseous alcohol is mixed with crude oil in the crude oil transportation pipeline injection section through the Venturi mixer.
8. The gaseous alcohol-based crude oil viscosity reduction system of claim 7, wherein, The crude oil transportation pipeline injection section further comprises a first viscosity meter arranged before an inlet of the Venturi mixer and a second viscosity meter arranged after an outlet of the Venturi mixer.
9. The gaseous alcohol-based crude oil viscosity reduction system of any one of claims 1 to 8, wherein, The alcohol is any one of methanol, ethanol and propanol.
10. An oil production system characterized by, The application further relates to a crude oil transportation viscosity reduction system based on gaseous alcohol injection, and an underwater oil extraction device, wherein crude oil extracted by the underwater oil extraction device is transported through a crude oil transportation pipeline, and the underwater oil extraction device comprises a drilling device.