A shale heating product collection and real-time quantification system and method
By designing a shale heating product collection and real-time quantification system, the problems of real-time product quantification and light hydrocarbon loss in in-situ heating simulation of low-mature shale were solved, realizing real-time accurate quantification of products and precise assessment of resource quantity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- PETROCHINA CO LTD
- Filing Date
- 2022-06-15
- Publication Date
- 2026-07-03
AI Technical Summary
In existing technologies, in-situ heating simulation of low-mature shale cannot achieve real-time quantitative analysis of products, and light hydrocarbon components are easily lost during collection, resulting in low liquid hydrocarbon yield and inaccurate component analysis.
Design a shale heating product collection and real-time quantification system, including crude oil, light hydrocarbon and gas collection and quantification units. The system achieves graded condensation and closed collection of products through connected collectors and weighing devices, and performs real-time quantification using weighing and gas quantification devices.
It enables real-time and accurate quantification of products during in-situ heating of low-mature shale, ensuring the complete collection of light hydrocarbons and providing a basis for accurate prediction of shale oil and gas resources and economic value assessment.
Smart Images
Figure CN117268979B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of shale oil and gas exploration and development and shale oil and gas resource evaluation technology, and in particular to a system and method for collecting and quantifying shale heating products in real time. Background Technology
[0002] Shale oil is currently one of the most significant growth drivers in global oil production. The organic-rich shale formations developed in China can be broadly classified into two categories: ancient marine shale formations in the south and Mesozoic-Cenozoic continental shale formations in the north. The ancient marine shale formations in the south have higher maturity (R...). o Shale regions with a maturity level greater than 2.0% are the main shale gas producing areas in my country. The shale formations widely developed in northern my country, except for a few limited areas in certain basins where the maturity level exceeds 1.3%, are mostly in the medium to low maturity stage. Due to their relatively low maturity, the amount of organic matter generated is low, and the resulting crude oil has a high content of heavy components, high specific gravity, high viscosity, and a low gas-oil ratio, making it unsuitable for direct extraction. It is more suitable for in-situ heating and development of shale oil.
[0003] Whether a specific low-maturity shale formation is valuable for shale oil development, and the determination of the optimal temperature and pressure conditions for in-situ heating shale oil development, all require pilot simulation experiments for verification. One of the most critical issues to address during these simulation experiments is the complete and accurate real-time quantification of all products (oil, light hydrocarbons, and gases) at different temperatures. Summary of the Invention
[0004] The inventors discovered that, in existing technologies, the collection and quantification of products from in-situ heating simulations of low-mature shale are generally performed after the experiment is completed, which cannot reflect the real-time changes in the yield of different simulated products. Currently, the collection and quantification of products from in-situ heating simulations of low-mature shale generally includes the following two methods:
[0005] (1) Phased collection method
[0006] Currently, the most common method for collecting and quantifying products from in-situ heating simulations of low-mature shale is the staged collection and quantification method. This method involves collecting and quantifying simulated products at different temperature ranges separately. One drawback of this method is that it cannot quantify the amount of different products generated throughout the entire simulation experiment in real time. Another drawback is that the quantification of liquid hydrocarbons often employs methods such as simulated residue extraction (including Soxhlet extraction, ultrasonic extraction, etc.) and solvent evaporation. However, this method cannot avoid the problem of light hydrocarbon loss during extraction. In the process of developing shale oil through in-situ heating, the liquid hydrocarbons that can be smoothly discharged from the source rock are mainly relatively light components. Therefore, the loss of light hydrocarbons is greater during the analysis and quantification of liquid hydrocarbons using this method, resulting in a lower total liquid hydrocarbon yield.
[0007] (2) Material balance method
[0008] The simulated sample weight (G0) is calculated as follows: Simulated gas production (G1) + Simulated non-volatile liquid hydrocarbon production (G2) + Simulated light hydrocarbon production (G3) + Simulated residue weight (G4). G0, G1, G2, and G4 can be obtained through relevant analytical calculations and weighing methods. Therefore, the amount of light hydrocarbons (G3) can be easily calculated using the above formula. However, while the amount of light hydrocarbons can be calculated using the mass balance method, the loss of light hydrocarbons makes further analysis of their specific components impossible.
[0009] In order to at least partially solve the technical problems existing in the prior art, the inventors made this invention, which provides a system and method for collecting and quantifying shale heating products in real time through specific embodiments. This system and method can realize the collection and real-time quantification of different products simulated by in-situ heating of low-maturity shale, and provide support for the selection of heating conditions in the process of shale development through in-situ heating.
[0010] In a first aspect, embodiments of the present invention provide a shale heating product collection and real-time quantification system, including a crude oil collection and quantification unit, a light hydrocarbon collection and quantification unit, and a gas collection and quantification unit;
[0011] The crude oil collection and metering unit includes a crude oil collector and a first weighing device, the first weighing device being used to determine the weight of crude oil in the crude oil collector; the light hydrocarbon collection and metering unit includes a light hydrocarbon collector and a second weighing device, the second weighing device being used to determine the weight of light hydrocarbons in the light hydrocarbon collector; the gas collection and metering unit includes a gas collector and a gas metering device connected thereto.
[0012] The inlet of the crude oil collector is connected to the outlet of the shale heating device, the outlet of the crude oil collector is connected to the inlet of the light hydrocarbon collector, and the outlet of the light hydrocarbon collector is connected to the inlet of the gas collector.
[0013] Secondly, embodiments of the present invention provide a method for collecting and real-time quantifying shale heating products, including:
[0014] The above system can be used to obtain the real-time weight of crude oil, the weight of light hydrocarbons, and the volume of gas condensed from the heating products of shale heating devices, and / or to obtain the weight of crude oil, the weight of light hydrocarbons, and the gas pressure in the heating products.
[0015] The beneficial effects of the above-described technical solutions provided in the embodiments of the present invention include at least the following:
[0016] (1) The shale heating product collection and real-time quantification system provided in this embodiment of the invention includes a crude oil collection and quantification unit, a light hydrocarbon collection and quantification unit, and a gas collection and quantification unit connected in sequence. The crude oil collection and quantification unit includes a crude oil collector and a first weighing device; the light hydrocarbon collection and quantification unit includes a light hydrocarbon collector and a second weighing device; the gas collection and quantification unit includes a gas collector and a gas quantification device connected thereto. The crude oil collector first condenses the crude oil from the heating products, the uncondensed light hydrocarbons and gases enter the light hydrocarbon collector to precipitate light hydrocarbons, and the last non-condensable gases enter the gas collector. The heating products are staged condensed and collected in a closed system, and the weighing device and the gas quantification device are used to realize real-time quantification of simulated products of different phases. It can realize the collection and real-time accurate quantification of different simulated products from in-situ heating of low-mature shale, overcome the defects of staged quantification, and ensure the complete collection of simulated products.
[0017] (2) The shale heating product collection and real-time quantitative system provided in this embodiment of the invention can provide experimental reference for accurate prediction of shale oil and gas resources and economic value assessment; and provide reliable basis for the selection of temperature and pressure conditions and heating methods in the actual production process of in-situ heating of low-mature shale.
[0018] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.
[0019] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description
[0020] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:
[0021] Figure 1 This is a schematic diagram of the shale heating product collection and real-time quantitative system in Embodiment 1 of the present invention;
[0022] Figure 2 This is a flowchart illustrating the specific implementation of the shale heating product collection and real-time quantitative method in Embodiment 2 of the present invention;
[0023] Figure 3 This is a real-time quantitative curve of crude oil obtained during the in-situ heating simulation experiment of oil shale at different heating rates in Embodiment 2 of the present invention;
[0024] Figure 4This is a real-time quantitative curve of light hydrocarbons obtained during the in-situ heating simulation experiment of oil shale at different heating rates in Example 2 of the present invention.
[0025] Figure 5 This is a real-time quantitative curve of non-condensable gas obtained during the in-situ heating simulation experiment of oil shale at different heating rates in Embodiment 2 of the present invention.
[0026] Figure 6 This is a full oil chromatogram of crude oil obtained during an in-situ heating simulation experiment of oil shale at a certain heating rate in Embodiment 2 of the present invention. Detailed Implementation
[0027] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
[0028] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.
[0029] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.
[0030] In the description of this invention, it should be noted that the terms "comprising," "including," "having," "containing," etc., are all open-ended terms, meaning that they include but are not limited to. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0031] To address the problems in existing technologies where it is impossible to quantify the heating products of low-mature shale in real time and where the collected light hydrocarbons are dispersed and lost, this invention provides a system and method for collecting and quantifying shale heating products in real time. This system can achieve the collection and accurate real-time quantification of different products simulated by in-situ heating of low-mature shale.
[0032] Example 1
[0033] Embodiment 1 of the present invention provides a system for collecting and real-time quantifying shale heating products, the structure of which is as follows: Figure 1 As shown, it includes a crude oil collection and metering unit, a light hydrocarbon collection and metering unit, and a gas collection and metering unit.
[0034] The crude oil collection and metering unit includes a crude oil collector and a first weighing device, which is used to determine the weight of the crude oil in the crude oil collector.
[0035] Specifically, the total weight of the crude oil collector and the crude oil collected in it can be obtained through the first weighing device, and then the weight of the collected crude oil can be obtained by subtracting the weight of the crude oil collector from the total mass; alternatively, the first weighing device can be zeroed before the experiment to remove the weight of the crude oil collector, and the weight of the crude oil collected in the crude oil collector can be directly obtained through the first weighing device during the experiment.
[0036] Furthermore, the first weighing device can be an analytical balance, on which the crude oil collector is placed, and the analytical balance is used to obtain the weight of the crude oil in the crude oil collector. Optionally, the first weighing device can also be other devices capable of weighing objects.
[0037] The light hydrocarbon collection and metering unit includes a light hydrocarbon collector and a second weighing device, which is used to determine the weight of light hydrocarbons in the light hydrocarbon collector. The inlet of the crude oil collector is connected to the outlet of the shale heating unit, and the outlet of the crude oil collector is connected to the inlet of the light hydrocarbon collector.
[0038] Specifically, the total weight of the light hydrocarbon collector and the light hydrocarbons collected therein can be obtained through the second weighing device, and then the weight of the collected light hydrocarbons can be obtained by subtracting the weight of the light hydrocarbon collector from the total mass; alternatively, the second weighing device can be zeroed before the experiment to remove the weight of the light hydrocarbon collector, and the weight of the light hydrocarbons collected in the light hydrocarbon collector can be directly obtained through the second weighing device during the experiment.
[0039] Furthermore, the second weighing device can also be an analytical balance, on which the light hydrocarbon collector is placed, and the analytical balance is used to obtain the weight of the light hydrocarbons in the light hydrocarbon collector. Optionally, the second weighing device can also be other devices capable of weighing objects.
[0040] Figure 1The first weighing device in the process is an analytical balance, specifically the first analytical balance; the second weighing device is also an analytical balance, specifically the second analytical balance.
[0041] In some embodiments, the crude oil collection and metering unit further includes a first condensation device and a first condensation controller, the first condensation controller being used to control the temperature of the first condensation device.
[0042] Furthermore, the first condensation device has a ring-shaped structure and is located on the outer periphery of the crude oil collector. The distance between the first condensation device and the crude oil collector meets the first set distance requirement.
[0043] Specifically, the shortest distance between the inner wall of the first condenser and the outer wall of the crude oil collector is 2 to 3 millimeters.
[0044] This not only condenses the products in the crude oil collector, but also does not affect the real-time weighing of the crude oil.
[0045] In some embodiments, the light hydrocarbon collection and metering unit further includes a second condensation device and a second condensation controller; the second condensation controller is used to control the temperature of the second condensation device.
[0046] Furthermore, the second condensing device has a ring structure and is located on the outer periphery of the light hydrocarbon collector. The distance between the second condensing device and the light hydrocarbon collector meets the second set distance requirement.
[0047] Specifically, the second set distance can be the same as or different from the first set distance mentioned above. For example, the shortest distance between the inner wall of the second condenser and the outer wall of the light hydrocarbon collector can be 2-3 millimeters. This not only condenses the product in the light hydrocarbon collector but also does not affect the real-time weighing of the light hydrocarbons.
[0048] In summary, apart from differences in connectivity and specific functions, the crude oil collection and metering unit and the light hydrocarbon collection and metering unit can contain identical specific devices and configurations.
[0049] The gas collection and metering unit includes a gas collector and a gas metering device connected thereto. The outlet of the light hydrocarbon collector is connected to the inlet of the gas collector.
[0050] In some embodiments, the gas metering device includes a gas flow meter disposed on a pipe connecting the outlet of the light hydrocarbon collector and the inlet of the gas collector, and / or a pressure sensor in communication with the gas collector.
[0051] The volume of gas can be directly obtained through a gas flow meter.
[0052] The real-time pressure inside the gas collector is obtained from the pressure sensor. When the condensed non-condensable gas enters the gas collector, the pressure inside the gas collector will increase. The increase in gas volume in the gas collector can be calculated based on the pressure change (P2-P1) and the volume of the gas collector (V0).
[0053] If the gas collection and metering unit is equipped with both the gas flow meter and the pressure sensor mentioned above, the average gas volume obtained from both can be used as the final gas volume.
[0054] Specifically, the gas volume determined in this embodiment refers to the volume of gas under standard atmospheric pressure conditions.
[0055] In some embodiments, the gas collector is also connected to a vacuum pump for evacuating the system before collecting and quantifying the shale heating products in real time.
[0056] The pressure sensor is connected between the vacuum pump and the gas collector.
[0057] The shale heating product collection and real-time quantification system provided in Embodiment 1 of this invention includes a crude oil collection and quantification unit, a light hydrocarbon collection and quantification unit, and a gas collection and quantification unit connected in sequence. The crude oil collection and quantification unit includes a crude oil collector and a first weighing device; the light hydrocarbon collection and quantification unit includes a light hydrocarbon collector and a second weighing device; and the gas collection and quantification unit includes a gas collector and a gas quantification device connected thereto. The crude oil collector first condenses the crude oil from the heating products. Uncondensed light hydrocarbons and gases enter the light hydrocarbon collector to precipitate light hydrocarbons, and finally, the gases enter the gas collector. The heating products are staged condensed and collected in a closed system. The weighing device and gas quantification device are used to achieve real-time quantification of simulated products in different phases. This system can realize the collection and accurate real-time quantification of different products simulated by in-situ heating of low-mature shale, overcoming the defects of staged quantification and ensuring the complete collection of simulated products.
[0058] The shale heating product collection and real-time quantitative system provided in Embodiment 1 of this invention can provide experimental reference for accurate prediction of shale oil and gas resources and economic value assessment; and provide a reliable basis for the selection of temperature and pressure conditions and heating methods in the actual production process of in-situ heating of low-mature shale.
[0059] Example 2
[0060] Embodiment 2 of the present invention provides a method for collecting and real-time quantifying shale heating products. Through the above-mentioned shale heating product collection and real-time quantification system, the weight of crude oil, the weight of light hydrocarbons and the volume of gas condensed in real time from the heating products of shale heated by the shale heating device are obtained, and / or, the weight of crude oil, the weight of light hydrocarbons and the gas pressure in the heating products are obtained.
[0061] See Figure 2 As shown, its specific implementation process is as follows: Figure 2 As shown, it may include the following steps:
[0062] Step S21: Vacuum treatment is performed on the low-maturity shale heating product collection and real-time quantitative system.
[0063] Before gas collection, the system (including the crude oil collector, light hydrocarbon collector, gas collector, and hydrocarbon discharge pipeline) is evacuated by the vacuum pump of the low-maturity shale heating product collection and real-time quantitative system until the pressure value collected by the pressure sensor no longer decreases, and then the vacuum pump is turned off.
[0064] Step S22: Adjust the temperature of the first condenser and the second condenser.
[0065] The temperature of the first condensing unit is controlled at 18–22°C by the first condensing controller of the crude oil collection and metering unit of the system; the temperature of the second condensing unit is controlled at 3–8°C by the second condensing controller of the light hydrocarbon collection and metering unit of the system.
[0066] Preferably, the temperature of the first condensing device is controlled at 20°C by the first condensing controller; and the temperature of the second condensing device is controlled at 5°C by the second condensing controller.
[0067] Step S23: Real-time quantitative analysis of the product generated from heating low-mature shale in the low-mature shale heating device.
[0068] Open the valve between the outlet of the heating device and the inlet of the crude oil collector. The oil and gas discharged from the heating device (initially in a gaseous state) first enters the crude oil collector through the hydrocarbon discharge pipeline. The oil and gas in the crude oil collector undergo primary condensation in the first condensing device outside the crude oil collector, and the precipitated crude oil is retained in the crude oil collector. The weight of the crude oil collected by the crude oil collector can be obtained in real time through the first weighing device. After the crude oil is collected, light hydrocarbons and gas continue to enter the light hydrocarbon collector, undergo secondary condensation in the second condensing device outside the light hydrocarbon collector, and the precipitated light hydrocarbons are retained in the light hydrocarbon collector. The weight of the light hydrocarbons collected by the light hydrocarbon collector can be obtained in real time through the second weighing device. After the crude oil and light hydrocarbons are collected, the remaining gas enters the gas collector. The gas flow meter at the front end of the gas collector records the gas volume in the gas collector in real time. At the same time, the real-time gas volume can also be calculated by the pressure data recorded in real time by the high-precision pressure sensor connected to the gas collector. The final real-time gas volume is the average of the two values.
[0069] Step S24: Obtain the correspondence between the weight of crude oil, the weight of light hydrocarbons, and the volume of gas condensed in real time from the heating products of the low-maturity shale heating device and the heating time.
[0070] Since the heating temperature gradually increases according to the set step size, the correspondence between heating time and heating temperature can be flexibly converted.
[0071] Reference Figures 3-5 The figures shown are real-time quantitative curves of total crude oil, light hydrocarbons, and gas (non-condensable gas remaining after condensation of crude oil and light hydrocarbons) obtained during in-situ heating simulation experiments of the Yanchang Formation oil shale in the Ordos Basin at different heating rates.
[0072] Step S25: Obtain the weight of crude oil, light hydrocarbons, and gas from the heating product.
[0073] Because the entire system is closed, the collected light hydrocarbons are not lost.
[0074] Reference Figure 6 The image shown is a chromatogram of crude oil obtained from an in-situ heating experiment of the Yanchang Formation oil shale in the Ordos Basin at a heating rate of 20°C / day, according to an embodiment of the present invention.
[0075] Combination Figures 3-6 The experimental results can provide reliable data for the heating temperature and heating method (heating step length) of in-situ heating extraction of low-mature shale oil.
[0076] Specifically, steps S24 and S25 are not in any particular order.
[0077] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process may be rearranged without departing from the scope of this disclosure. The appended method claims provide elements of various steps in an exemplary order and are not intended to limit the scope to the specific order or hierarchy described.
[0078] In the detailed description above, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features in a single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, with each claim representing a separate preferred embodiment of the invention.
[0079] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments; however, those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims.
Claims
1. A shale heating product collection and real-time quantification system characterized in that, This includes crude oil collection and metering units, light hydrocarbon collection and metering units, and gas collection and metering units; The crude oil collection and metering unit includes a crude oil collector and a first weighing device, the first weighing device being used to determine the weight of crude oil in the crude oil collector; the light hydrocarbon collection and metering unit includes a light hydrocarbon collector and a second weighing device, the second weighing device being used to determine the weight of light hydrocarbons in the light hydrocarbon collector; the gas collection and metering unit includes a gas collector and a gas metering device connected thereto. The inlet of the crude oil collector is connected to the outlet of the shale heating device, the outlet of the crude oil collector is connected to the inlet of the light hydrocarbon collector, and the outlet of the light hydrocarbon collector is connected to the inlet of the gas collector. The crude oil collection and metering unit further includes a first condensation device and a first condensation controller, wherein the first condensation controller is used to control the temperature of the first condensation device; the light hydrocarbon collection and metering unit further includes a second condensation device and a second condensation controller; the second condensation controller is used to control the temperature of the second condensation device. The first condensing device has a ring structure, and the distance between the first condensing device and the crude oil collector meets the first set distance requirement; the second condensing device has a ring structure, and the distance between the second condensing device and the light hydrocarbon collector meets the second set distance requirement; The shortest distance between the inner wall of the first condenser and the outer wall of the crude oil collector is 2-3 mm; the shortest distance between the inner wall of the second condenser and the outer wall of the light hydrocarbon collector is 2-3 mm.
2. The system of claim 1, wherein, The gas metering device includes a gas flow meter installed on a pipe connecting the outlet of the light hydrocarbon collector and the inlet of the gas collector, and / or a pressure sensor connected to the gas collector.
3. The system of claim 2, wherein, The gas collector is also connected to a vacuum pump; The pressure sensor is connected between the vacuum pump and the gas collector.
4. A shale heating product collection and real-time quantification method characterized by, include: The system according to any one of claims 1 to 3 can be used to obtain the weight of crude oil, the weight of light hydrocarbons and the volume of gas condensed in real time from the heating products of shale heating device heating shale, and / or to obtain the weight of crude oil, the weight of light hydrocarbons and the gas pressure in the heating products. The correspondence between the weight of crude oil, the weight of light hydrocarbons, and the volume of gas condensed in real time from the heating products of shale heating device and the heating time was obtained. The temperature of the first condensing device is controlled at 18-22°C by the first condensing controller of the crude oil collection and metering unit of the system; the temperature of the second condensing device is controlled at 3-8°C by the second condensing controller of the light hydrocarbon collection and metering unit of the system.