CO2 drive ground gathering and transportation system
By using a circulating liquid doping system and photoelectric heating device in the CO2 ground transport system, the liquid production is heated up, and the problem of frozen and blocked pipelines and weak energy carrying capacity during CO2 oil transport is solved, and efficient liquid transport and cost are achieved reduce.
Patent Information
- Application Number
- CN202420613934.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-28
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-03-28
AI Technical Summary
During the CO2 oil-driving process, when the produced fluid enters the ground collection and transportation pipeline, the gas throttling and expanding to absorb a large amount of heat, resulting in the collection and transportation system requiring high thermal conditions and increasing the risk of freezing and blocking.
A CO2-drive ground transportation system is designed, including a centralized processing station, an oil collection valve group and a circulating liquid doping system, which heats up the liquid through a photoelectric heating device to prevent the pipeline from being frozen and blocked. Each group of circulating liquid doping systems includes multiple oil wells, with a photoelectric heating device at the end and connected to the oil collecting valve group through a pipeline to ensure that the circulating liquid doping or external transmission after the liquid production heats up.
Effectively prevent pipeline freezing and blockage, solve the problems of weak energy carrying capacity and small transportation radius caused by dispersed oil well layout, low liquid production, low water content of production liquid, and small transportation radius, reduce the input-output ratio of CO2 drive, reduce costs, and improve Economic benefits.
Smart Images
Figure CN222316689U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of oil field development, in particular to a CO2 flooding ground gathering and transportation system. Background Art
[0002] With the continuous development of various oil and gas fields, CO2 flooding has become the main technology for tertiary oil recovery. Due to the extraction effect of CO2, the components and physical properties of the produced crude oil change in the early stage of development and the middle and late stages of development. In the early stage of development, the light group in the formation is extracted, and the density, viscosity and freezing point of the produced fluid are all low; in the middle and late stages, heavy components are produced, the density increases, and the viscosity and freezing point increase. At the same time, when the produced fluid enters the ground gathering and transportation pipeline from the wellbore, the gas throttling expansion work absorbs a large amount of heat, which will cause the thermal conditions required by the gathering and transportation system to be higher than other development methods, and there is a risk of freezing and blocking of the oil gathering pipeline. Utility Model Content
[0003] The utility model aims to overcome the shortcomings of the prior art and proposes a CO2 flooding ground gathering and transportation system that can effectively prevent pipeline freezing and blockage.
[0004] The technical solution adopted by the utility model to solve its technical problems is:
[0005] A CO2 drive ground gathering and transportation system includes a centralized processing station, an oil-gathering valve group, and a circulating liquid-adding system; each centralized processing station is connected to at least one set of oil-gathering valve groups, each set of oil-gathering valve groups is connected to at least one set of circulating liquid-adding systems, each set of circulating liquid-adding systems includes multiple oil wells, and the production of all oil wells in each set of circulating liquid-adding systems is connected in series. A photoelectric heating device is set at the end well field of the circulating liquid-adding system, and is connected to the oil-gathering valve group through a pipeline. The production liquid is heated by the photoelectric heating device and then circulated for liquid addition or external transmission to prevent pipeline freezing. After the oil well production liquid is connected in series, part of it is used for back-mixing, and part of it is externally transmitted to the oil-gathering valve group and then to the centralized processing station.
[0006] Furthermore, each group of circulating liquid injection systems includes 4-10 oil wells, such as 4, 5, 7, 8, 10, etc.
[0007] Furthermore, each set of oil collecting valve groups is connected to 2-8 groups of circulating liquid injection systems, such as 2 groups, 3 groups, 5 groups, 8 groups, etc.
[0008] Furthermore, each centralized processing station is connected to 2-10 sets of oil collecting valve groups, such as 2 sets, 3 sets, 4 sets, 6 sets, 9 sets, etc.
[0009] Furthermore, 36 oil wells are arranged, and every 4 oil wells form a circulating liquid injection system, forming a total of 9 circulating liquid injection systems. Every 3 groups of circulating liquid injection systems are connected to the same set of oil collecting valve groups, forming 3 sets of oil collecting valve groups. The 3 sets of oil collecting valve groups are connected to the same centralized processing station for collecting the liquid produced by each circulating liquid injection system to the centralized processing station.
[0010] Technical effects of the utility model:
[0011] Compared with the prior art, the utility model provides a CO2 drive ground gathering and transportation system, in which each group of circulating liquid injection systems includes multiple oil wells, and the liquid production of all the oil wells in each group of circulating liquid injection systems is connected in series. At the same time, a photoelectric heating device is arranged at the well site at the end of each group of circulating liquid injection systems, which can effectively prevent the freezing and blockage of the pipeline. At the same time, it also solves the shortcomings of weak energy carrying capacity and small gathering and transportation radius caused by the dispersed layout of oil wells, low liquid production and low water content of produced liquid, so that the liquid production of dispersed oil wells can be concentrated and transported to a centralized processing station. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a schematic diagram of the structural principle of the CO2 flooding ground gathering and transportation system of the utility model.
[0013] In the figure, 1. centralized processing station; 2. oil collecting valve group; 3. oil well; 4. photoelectric heating device. DETAILED DESCRIPTION
[0014] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model is clearly and completely described below in conjunction with the accompanying drawings of the specification.
[0015] Embodiment 1:
[0016] like Figure 1 As shown, the present embodiment involves a CO2 flooding ground gathering and transportation system, comprising a centralized processing station 1, an oil collecting valve group 2 and a circulating liquid injection system; each centralized processing station 1 is connected to three sets of oil collecting valve groups 2, each set of oil collecting valve groups 2 is connected to three sets of circulating liquid injection systems, each set of circulating liquid injection systems comprises four oil wells 3, the production liquids of the four oil wells 3 of each set of circulating liquid injection systems are connected in series, a photoelectric heating device 4 is arranged at the end well field of each set of circulating liquid injection systems, and is connected to the oil collecting valve group 2 through a pipeline, the production liquid is heated by the photoelectric heating device 4 and then circulated for liquid injection or external transmission to prevent freezing of the pipeline.
[0017] In this embodiment, there are 36 oil wells 3 in total, and every 4 oil wells 3 form a group of circulating liquid doping systems, forming a total of 9 groups of circulating liquid doping systems. Every 3 groups of circulating liquid doping systems are connected to the same set of oil collecting valve groups 2, forming 3 sets of oil collecting valve groups 2, and the 3 sets of oil collecting valve groups 2 are connected to the same centralized processing station 1, which is used to collect the liquid produced by each circulating liquid doping system to the centralized processing station 1. After the liquid produced by the 4 oil wells 3 in each group of circulating liquid doping system is connected in series, a part is used for back doping, circulating liquid doping, and a part is externally transported to the oil collecting valve group 2 and then transported to the centralized processing station 1.
[0018] It should be noted that the photoelectric heating device 4 described in the present invention and how to install the photoelectric heating device 4 in the well site all adopt the existing technology, and the present invention will not elaborate on this.
[0019] The main pipeline of the circulating liquid injection system of the utility model adopts a heat-insulating non-metallic pipe, the pipeline from the wellhead of the oil well 3 to the circulating system adopts a bimetallic pipe, the oil output section of the oil well 3 adopts skin effect heating, and uses electrical energy as a thermal energy source. It has greater advantages in maintaining the temperature field when the pipeline is inspected and repaired or the transmission is stopped in an accident state, and the wellhead temperature is raised to 30-40°C to prevent the pipeline from freezing and blocking. If there is a high-liquid well nearby, it can be connected nearby, and the energy-saving micro-ring arrangement at the starting point can increase the starting liquid injection volume; the overall energy consumption of local heating or pressurization is the lowest (pressurization can be performed when the gathering and transportation radius is greater than 4km). The utility model is provided with a circulating liquid injection system, an oil collecting valve group 2 and a centralized processing station 1, that is, after a number of oil wells 3 form a circulating liquid injection system, a number of circulating liquid injection systems are connected to the oil collecting valve group 2, and a number of oil collecting valve groups 2 centrally transport the oil well 3 production liquid to the centralized processing station 1, which solves the shortcomings of the oil well 3 being dispersed in layout, low liquid production, and low water content in the produced liquid, resulting in weak energy carrying capacity and small gathering and transportation radius. The utility model can not only effectively prevent pipeline freezing and blockage, but also significantly reduce the input-output ratio of CO2 flooding, reduce costs and improve economic benefits.
[0020] The above-mentioned specific implementation methods are only specific cases of the present utility model. The patent protection scope of the present utility model includes but is not limited to the above-mentioned specific implementation methods. Any appropriate changes or modifications made to them by ordinary technicians in the relevant technical field in accordance with the claims of the present utility model shall fall within the patent protection scope of the present utility model.
Claims
1. A CO2 flooding surface gathering and transportation system, characterized by: The invention comprises a centralized processing station (1), an oil collecting valve group (2) and a circulating liquid doping system; each centralized processing station (1) is connected to at least one set of oil collecting valve groups (2), each set of oil collecting valve groups (2) is connected to at least one set of circulating liquid doping systems, each set of circulating liquid doping systems comprises a plurality of oil wells (3), the production of liquid from all oil wells (3) in each set of circulating liquid doping systems is connected in series, and a photoelectric heating device (4) is provided at the well site at the end of the circulating liquid doping system and is connected to the oil collecting valve group (2) via a pipeline.
2. The CO2 flooding surface gathering and transportation system according to claim 1 is characterized in that: Each group of circulating liquid injection systems includes 4 to 10 oil wells (3).
3. The CO2 flooding surface gathering and transportation system according to claim 1 is characterized in that: Each set of oil collecting valve group (2) is connected to 2 to 8 sets of circulating liquid injection systems.
4. The CO2 flooding surface gathering and transportation system according to claim 1, 2 or 3, characterized in that: Each centralized processing station (1) is connected to 2 to 10 sets of oil collecting valve groups (2).
5. The CO2 flooding surface gathering and transportation system according to claim 1 is characterized in that: The oil wells (3) are provided with 36 oil wells, and every four oil wells (3) form a group of circulating liquid injection systems, forming a total of nine groups of circulating liquid injection systems. Every three groups of circulating liquid injection systems are connected to the same set of oil collecting valve groups (2), forming three sets of oil collecting valve groups (2), and the three sets of oil collecting valve groups (2) are connected to the same centralized processing station (1).