Device and method for measuring high-temperature and high-pressure heat conductivity coefficient of thickened oil

Abstract

The invention discloses a heavy oil high-temperature high-pressure heat conductivity coefficient measuring device and method, and the device comprises a pressure kettle, the pressure kettle is arranged in a drying oven, a test probe is arranged in the center of the interior of the pressure kettle, a test line quick interface is arranged above the center of the pressure kettle, and the test line quick interface is connected with a heat conductivity tester; a thick oil pressurizer connector, a pressure release valve connector and a pressure sensor connector are arranged on the side face of the pressure kettle, the thick oil pressurizer connector is connected with a thick oil sample adding and pressurizing device, the pressure release valve connector is connected with a pressure release valve, and the pressure sensor connector is connected with a pressure sensor. The device can realize thermophysical property test of fluids such as thick oil under different temperature conditions of normal temperature to 300 DEG C and different pressure conditions of 0-30 MPa, solves the problem of lack of a thick oil high-temperature and high-pressure heat conductivity coefficient measuring device, improves the accuracy of thermal recovery reservoir simulation and process design, and further promotes the development of an offshore oilfield thick oil thermal recovery process technology.

Description

Technical Field

[0001] The present invention belongs to the technical field of fluid thermal property testing experiments in the thermal recovery process of heavy oil, and particularly relates to a device and method for measuring the thermal conductivity of heavy oil at high temperature and high pressure. Background Art

[0002] During the thermal recovery process, when the heat carrier flows along the wellbore, the state of the hot fluid at the bottom of the well is related to the heat loss of the wellbore. After the heat carrier fluid enters the oil reservoir, it will release heat, and the temperature of the reservoir rock and fluid will increase. The overlying and underlying strata are simultaneously heated and heat loss occurs, and the magnitude of the heat loss is closely related to the thermal property parameters of the rock and the fluid in the pores. Under certain heat conditions, when the reservoir system reaches the heat balance state, the magnitude of the effective heat effect, that is, the degree of reservoir temperature rise, the heated range, the elastic energy of the oil drainage area, etc., all need to be calculated based on data such as the thermal conductivity of the reservoir rock and fluid.

[0003] It can be seen that the thermal property parameters of reservoir fluids under steam injection conditions are essential basic parameters in reservoir engineering research and the design of thermal recovery enhancement processes. When the reservoir fluid is in a high-temperature and high-pressure environment during the thermal recovery process, its thermal conductivity is different from that under normal temperature and pressure conditions.

[0004] Currently, existing devices cannot measure the thermal conductivity under specific high-temperature and high-pressure conditions, so they cannot meet the needs of reservoir simulation in the development of heavy oil thermal recovery oilfields. Summary of the Invention

[0005] The problem to be solved by the present invention is to provide a device and method for measuring the thermal conductivity of heavy oil at high temperature and high pressure, and to realize the thermal property testing of fluids such as heavy oil under different temperature conditions from normal temperature to 300 °C and different pressure conditions from 0 to 30 MPa.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a device for measuring the thermal conductivity of heavy oil at high temperature and high pressure, including a pressure kettle, the pressure kettle is placed in an oven, a test probe is provided at the center inside the pressure kettle, a test line quick connector is provided above the center of the pressure kettle, the test line quick connector is connected to a thermal conductivity tester, a heavy oil pressurizer interface, a pressure relief valve interface and a pressure sensor interface are provided on the side of the pressure kettle, the heavy oil pressurizer interface is connected to a heavy oil sampling and pressurizing device, the pressure relief valve interface is connected to a pressure relief valve, and the pressure sensor interface is connected to a pressure sensor.

[0007] Further, the pressure kettle includes a pressure kettle body and a pressure kettle cover, a pressure kettle cavity is provided at the center of the pressure kettle body, the test probe is placed in the pressure kettle cavity, the pressure kettle cover is placed on the upper part of the pressure kettle body, and the pressure kettle cover and the pressure kettle body are connected by a flange structure.

[0008] Further, a sealing gasket is provided between the autoclave cover and the autoclave body, and the sealing gasket is made of graphite.

[0009] Further, the test probe is threadedly connected to the autoclave cover, and a sealing ring is provided between the test probe and the autoclave cover. The sealing ring is made of copper.

[0010] Further, the test probe includes a thermal conductivity test platinum wire probe and a temperature probe. The test probe is externally connected to a data line and connected to a computer, and the test data is displayed through the computer.

[0011] Further, the heavy oil pressurizer interface, the pressure relief valve interface, and the pressure sensor interface are all threaded holes, and the heavy oil pressurizer interface, the pressure relief valve interface, and the pressure sensor interface are all sealed by means of stainless steel compression cap joints.

[0012] Further, the heavy oil sampling and pressurizing device includes a piston container, which is placed in a medium-temperature constant temperature box. A first inlet and an outlet are provided above the piston container. The heavy oil for testing enters the cavity of the piston container through the first inlet, and the outlet is connected to the heavy oil pressurizer interface. A second inlet is provided below the piston container, and the second inlet is connected to a high-pressure plunger pump through a pipeline.

[0013] Further, the pressure sensor is connected to the computer through a wire.

[0014] Further, the present invention also provides a method for measuring the thermal conductivity of heavy oil at high temperature and high pressure. Using the above-mentioned device for measuring the thermal conductivity of heavy oil at high temperature and high pressure, it includes the following steps:

[0015] S1: Pour the processed heavy oil sample into the heavy oil sampling and pressurizing device and keep it at a constant temperature at a temperature at which the heavy oil can flow.

[0016] S2: Connect the heavy oil sampling and pressurizing device to the autoclave. The connection between the heavy oil sampling and pressurizing device and the autoclave is heat-insulated by electric tracing. Install the test probe, connect the data line of the test probe, and place the autoclave in the oven.

[0017] S3: Set the oven temperature to be the same as the temperature of the heavy oil sampling and pressurizing device, preheat the autoclave and the connecting pipeline, and turn on the electric tracing switch.

[0018] S4: Open the control valve at the pressure relief valve interface, start the high-pressure plunger pump in the heavy oil sampling and pressurizing device to pressurize the piston container, so that the crude oil in the piston container is displaced and enters the autoclave through the connecting pipeline. Use the evacuation method to discharge the air in the autoclave and fill the autoclave with crude oil.

[0019] S5: When there is continuous outflow of viscous oil from the pressure sensor interface, continue to displace 50 mL, close the control valve at the pressure sensor interface, adjust the high-pressure plunger pump to the constant pressure mode, and continue to displace the crude oil in the piston container into the autoclave until the pressure in the autoclave reaches the experimental pressure, and obtain the true pressure in the autoclave through the data measured by the pressure sensor;

[0020] S6: Open the control valve of the connecting pipeline of the viscous oil pressurizer interface, set the high-pressure plunger pump to maintain the constant pressure mode, set the oven temperature to the experimental temperature. During the heating process of the autoclave, when the viscous oil expands during heating, it flows back into the piston container, and at the same time, maintain the pressure in the autoclave constant;

[0021] S7: When the temperature and pressure of the viscous oil in the autoclave reach the experimental conditions and are maintained constant, use the test software on the computer to conduct tests to obtain the thermal conductivity of the viscous oil sample under the experimental conditions.

[0022] Further, the S1 includes the following steps

[0023] S11: Pour the processed viscous oil sample into the upper cavity of the piston container of the viscous oil sampling and pressurizing device;

[0024] S12: Place the piston container in the medium-temperature constant temperature oven;

[0025] S13: Connect the lower inlet of the piston container to the high-pressure plunger pump through a pipeline;

[0026] S14: Open the medium-temperature constant temperature oven, set the temperature of the constant temperature oven to 50 - 80 °C, and keep it constant for more than 2 hours.

[0027] The advantages and positive effects of the present invention are:

[0028] The present invention discloses a device for measuring the thermal conductivity of viscous oil at high temperature and high pressure, which can realize the thermal property test of fluids such as viscous oil under different temperature conditions from normal temperature to 300 °C and different pressure conditions from 0 to 30 MPa. It solves the problem of the lack of a device for measuring the thermal conductivity of viscous oil at high temperature and high pressure, improves the accuracy of thermal recovery reservoir simulation and process design, and further promotes the development of the viscous oil thermal recovery process technology in offshore oilfields. Description of the Drawings

[0029] Figure 1 is the overall structural schematic diagram of the embodiment of the present invention.

[0030] Figure 2 is the structural schematic diagram of the autoclave of the embodiment of the present invention.

[0031] Figure 3It is a schematic structural diagram of the autoclave cover according to an embodiment of the present invention.

[0032] Figure 4 It is a schematic structural diagram of the viscous oil sampling and pressurizing device according to an embodiment of the present invention.

[0033] Figure 5 It is the overall flowchart of the method embodiment of the present invention.

[0034] In the figure:

[0035] 1. Autoclave; 2. Oven; 3. Quick interface for test line;

[0036] 4. Platinum wire probe for thermal conductivity test; 5. Temperature probe; 6. Autoclave cover;

[0037] 7. Autoclave cavity; 8. Interface for viscous oil pressurizer; 9. Interface for pressure relief valve;

[0038] 10. Interface for pressure sensor; 11. High-pressure piston pump; 12. Medium-temperature constant temperature box;

[0039] 13. Piston container; 14. Electric heat tracing. Detailed implementation manners

[0040] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0043] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings:

[0044] As Figure 1 shown, a device for measuring the thermal conductivity of heavy oil at high temperature and high pressure includes a pressure kettle 1 placed in an oven 2. A test probe is provided at the center inside the pressure kettle 1, and a test line quick connector 3 is provided above the center of the pressure kettle 1. The test line quick connector 3 is connected to a thermal conductivity tester. A heavy oil pressurizer interface 8, a pressure relief valve interface 9, and a pressure sensor interface 10 are provided on the side of the pressure kettle 1. The heavy oil pressurizer interface 8 is connected to a heavy oil sampling and pressurizing device, the pressure relief valve interface 9 is connected to a pressure relief valve, and the pressure sensor interface 10 is connected to a pressure sensor.

[0045] Specifically, as [[ID=B]] Figure 2 shown, the pressure kettle 1 includes a pressure kettle body and a pressure kettle cover 6. A pressure kettle cavity 7 is provided at the center of the pressure kettle body, and the test probe is placed inside the pressure kettle cavity 7. The pressure kettle cover 6 is placed on the upper part of the pressure kettle body, and the pressure kettle cover 6 and the pressure kettle body are connected by a flange structure. Preferably, a sealing gasket is provided between the pressure kettle cover 6 and the pressure kettle body, and the sealing gasket is made of graphite to ensure the sealing stability in a high-temperature and high-pressure environment.

[0046] There is a connection and seal between the test probe and the pressure kettle cover 6 through a threaded retaining ring structure. A sealing ring is provided between the test probe and the pressure kettle cover 6, and the sealing ring is made of copper to ensure the sealing stability and wear resistance in a high-temperature and high-pressure environment.

[0047] As Figure 2 shown, the test probe includes a thermal conductivity test platinum wire probe 4 and a temperature probe 5. The test probe is externally connected to a data line and connected to a computer, and the test data can be displayed on the computer.

[0048] As Figure 3 shown, the three interfaces reserved on the pressure kettle cover 6 are threaded holes and are sealed by means of stainless steel compression cap connectors.

[0049] Specifically, as Figure 1 shown, the top and side of the oven 2 of this embodiment are respectively drilled. The pressure kettle 1 is fixed inside the oven 2 so that the test heavy oil is in a high-temperature environment. The test probe extends out through the hole at the top of the oven 2, and heat-insulating cotton is filled at the connection between the test probe and the hole of the oven 2 so that the externally connected data line of the test probe is in a normal-temperature environment to prevent damage caused by high temperature. The connecting pipelines of the heavy oil pressurizer interface 8, the pressure relief valve interface 9, and the pressure sensor interface 10 extend out through the hole on the side of the oven 2, and heat-insulating cotton is filled at the connection between the test pipeline and the hole of the oven 2 to ensure that the test wires of the pressure relief valve interface 9 and the pressure sensor interface 10 are in a normal-temperature environment to prevent damage caused by high temperature and facilitate the operation of opening and closing the valves at the same time.

[0050] The heavy oil sampling and pressurizing device includes a high-pressure plunger pump 11, a piston container 13, a medium-temperature constant-temperature oven 12 and connecting pipelines. A first inlet and an outlet are provided above the piston container 13. The heavy oil for testing is added into the upper cavity of the piston container 13, and the whole is placed in the medium-temperature constant-temperature oven 12 and kept at a temperature at which the heavy oil can flow. The upper outlet is connected to the heavy oil pressurizer interface 8 through a pipeline, and the outlet pipeline is insulated by an electric tracing 14 to ensure the fluidity during the heavy oil sampling process. A second inlet is provided below the piston container 13, and the second inlet is connected to the high-pressure plunger pump 11 through a pipeline.

[0051] Preferably, the pressure sensor interface 10 is inserted with a pressure sensor, and the test pressure is transmitted to a computer through a wire. During the sampling and pressurizing process, the pressure inside the high-temperature and high-pressure test container is judged by reading the test pressure data.

[0052] As Figure 4 shown, the present invention also provides a method for measuring the thermal conductivity of heavy oil at high temperature and high pressure. Using the above-mentioned device for measuring the thermal conductivity of heavy oil at high temperature and high pressure, it includes the following steps:

[0053] S1: Pour the treated heavy oil sample into the heavy oil sampling and pressurizing device and keep it at a temperature at which the heavy oil can flow. Specifically, S1 includes the following steps:

[0054] S11: Pour the treated heavy oil sample into the upper cavity of the piston container of the heavy oil sampling and pressurizing device;

[0055] S12: Place the piston container in the medium-temperature constant-temperature oven;

[0056] S13: Connect the lower inlet of the piston container to the high-pressure plunger pump through a pipeline;

[0057] S14: Open the medium-temperature constant-temperature oven, set the temperature of the constant-temperature oven to 50 - 80 °C, and keep it constant for more than 2 hours.

[0058] S2: Connect the heavy oil sampling and pressurizing device to the autoclave 1. The connection between the heavy oil sampling and pressurizing device and the autoclave 1 is insulated by electric tracing. Install the test probe. Specifically, install the test probe on the autoclave cover 6 and use a wrench to tighten the connection thread. Connect the data line of the test probe. Place the autoclave 1 in the oven 2, and connect the three reserved interfaces on the autoclave cover 6 to the heavy oil sampling and pressurizing device, the pressure sensor and the pressure relief valve respectively.

[0059] S3: Set the temperature of the oven 2 to be the same as the temperature of the heavy oil sampling and pressurizing device, preheat the autoclave 1 and the connecting pipeline for more than 2 hours, and turn on the electric tracing switch.

[0060] S4: Open the control valve at the pressure relief valve interface 9, start the high-pressure plunger pump in the heavy oil sampling and pressurizing device to pressurize the piston container, so that the crude oil in the piston container is displaced and enters the autoclave 1 through the connecting pipeline. Use the evacuation method to discharge the air in the autoclave 1, so that the autoclave 1 is filled with crude oil.

[0061] S5: When heavy oil continuously flows out from the pressure sensor interface 10, continue to displace 50 mL, close the control valve at the pressure sensor interface 10, adjust the high-pressure plunger pump to the constant pressure mode, and continue to displace the crude oil in the piston container into the autoclave 1 to make the pressure in the autoclave 1 reach the experimental pressure. In this embodiment, the experimental pressure is set to 20 MPa. Obtain the real pressure in the autoclave 1 through the data measured by the pressure sensor.

[0062] S6: Open the control valve of the connecting pipeline at the heavy oil pressurizer interface 8, set the high-pressure plunger pump to maintain the constant pressure mode, set the temperature of the oven 2 to the experimental temperature. In this embodiment, the experimental temperature is set to 300 °C, and keep it at a constant temperature for no less than 2 h. During the heating process of the autoclave 1, when the heavy oil expands during heating, it flows back to the piston container, and at the same time, keep the pressure of the autoclave 1 constant.

[0063] S7: When the temperature and pressure of the heavy oil in the autoclave 1 reach the experimental conditions and remain constant, use the test software on the computer to conduct tests to obtain the thermal conductivity of the heavy oil sample under the experimental conditions. The thermal conductivity of the heavy oil sample in this embodiment is 139.6 mW / (m·K) under the conditions of 300 °C and 20 MPa.

[0064] Preferably, this device and method can not only test the thermal conductivity of heavy oil, but also test the thermal conductivity of other liquid materials under different pressure and temperature conditions.

[0065] The advantages and positive effects of the present invention are:

[0066] The present invention discloses a device for measuring the thermal conductivity of heavy oil at high temperature and high pressure, which can realize the thermal property test of fluids such as heavy oil under different temperature conditions from normal temperature to 300 °C and different pressure conditions from 0 to 30 MPa. It solves the problem of the lack of a device for measuring the thermal conductivity of heavy oil at high temperature and high pressure, improves the accuracy of thermal recovery reservoir simulation and process design, and further promotes the development of heavy oil thermal recovery process technology in offshore oilfields.

[0067] The above has described a detailed description of an embodiment of the present invention, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. An apparatus for measuring the thermal conductivity of heavy oil at high temperature and high pressure, characterized in that: It includes an autoclave which is placed inside an oven. A test probe is provided at the center inside the autoclave. Above the center of the autoclave, there is a quick connection port for the test wire, and the quick connection port for the test wire is connected to a thermal conductivity tester. On the side of the autoclave, there are an interface for viscous oil pressurizer, a pressure relief valve interface, and a pressure sensor interface. The interface for viscous oil pressurizer is connected to a viscous oil sampling and pressurizing device, the pressure relief valve interface is connected to a pressure relief valve, and the pressure sensor interface is connected to a pressure sensor.

2. The high-temperature and high-pressure thermal conductivity measuring device for heavy oil according to claim 1, wherein: The autoclave includes an autoclave body and an autoclave cover. A pressure chamber is provided at the center of the autoclave body, and the test probe is placed inside the pressure chamber. The autoclave cover is placed on the upper part of the autoclave body, and the autoclave cover and the autoclave body are connected by a flange structure.

3. The high-temperature and high-pressure thermal conductivity measuring device for heavy oil according to claim 2, wherein: A sealing gasket is provided between the autoclave cover and the autoclave body, and the sealing gasket is made of graphite.

4. A high-temperature and high-pressure thermal conductivity measurement device for heavy oil according to any one of claims 1 to 3, characterized in that: The test probe is connected to the autoclave cover by a thread, and a sealing ring is provided between the test probe and the autoclave cover. The sealing ring is made of copper.

5. A high-temperature and high-pressure thermal conductivity measuring device for heavy oil according to any one of claims 1 to 3, characterized in that: The test probe includes a thermal conductivity test platinum wire probe and a temperature probe. The test probe is externally connected to a data line and connected to a computer, and the test data is displayed through the computer.

6. A high-temperature and high-pressure thermal conductivity measurement device for heavy oil according to any one of claims 1 to 3, characterized in that: The interfaces for viscous oil pressurizer, the pressure relief valve interface, and the pressure sensor interface are all threaded holes, and the interfaces for viscous oil pressurizer, the pressure relief valve interface, and the pressure sensor interface are all sealed by means of stainless steel compression cap joints.

7. A high-temperature and high-pressure thermal conductivity measuring device for heavy oil according to any one of claims 1 to 3, characterized in that: The viscous oil sampling and pressurizing device includes a piston container which is placed inside a medium-temperature constant temperature oven. There is a first inlet and an outlet above the piston container. The viscous oil for testing enters the cavity of the piston container through the first inlet, and the outlet is connected to the interface for viscous oil pressurizer. There is a second inlet below the piston container, and the second inlet is connected to a high-pressure plunger pump through a pipeline.

8. A high-temperature and high-pressure thermal conductivity measuring device for heavy oil according to claim 5, characterized in that: The pressure sensor is connected to the computer through a wire.

9. A method for measuring the thermal conductivity of heavy oil at high temperature and high pressure, which uses the device for measuring the thermal conductivity of heavy oil at high temperature and high pressure according to any one of claims 1 to 8, and is characterized in that: It includes the following steps S1: Pour the treated viscous oil sample into the viscous oil sampling and pressurizing device and keep it at a constant temperature at a temperature at which the viscous oil can flow. S2: Connect the viscous oil sampling and pressurizing device to the autoclave. Use electric tracing for heat preservation at the connection between the viscous oil sampling and pressurizing device and the autoclave. Install the test probe, connect the data line of the test probe, and place the autoclave into the oven. S3: Set the oven temperature to be the same as the temperature of the viscous oil sampling and pressurizing device, preheat the autoclave and the connecting pipeline, and turn on the electric tracing switch. S4: Open the control valve at the pressure relief valve interface, start the high-pressure plunger pump in the viscous oil sampling and pressurizing device to pressurize the piston container, so that the crude oil in the piston container is displaced, enters the autoclave through the connecting pipeline, and uses the evacuation method to discharge the air in the autoclave, so that the autoclave is filled with crude oil. S5: When there is continuous outflow of viscous oil from the pressure sensor interface, continue to displace 50 mL, close the control valve at the pressure sensor interface, adjust the high-pressure piston pump to the constant pressure mode, and continue to displace the crude oil in the piston container into the autoclave until the pressure in the autoclave reaches the experimental pressure, and obtain the true pressure in the autoclave through the data measured by the pressure sensor; S6: Open the control valve of the connecting pipeline of the viscous oil pressurizer interface, set the high-pressure piston pump to maintain the constant pressure mode, set the oven temperature to the experimental temperature. During the heating process of the autoclave, when the viscous oil expands during heating, it flows back into the piston container, and at the same time, maintain the pressure in the autoclave constant; S7: When the temperature and pressure of the viscous oil in the autoclave reach the experimental conditions and remain constant, use the test software on the computer to conduct tests to obtain the thermal conductivity of the viscous oil sample under the experimental conditions.

10. A method for measuring the thermal conductivity of heavy oil at high temperature and high pressure according to claim 9, characterized in that: The said S1 includes the following steps, S11: Pour the treated viscous oil sample into the upper cavity of the piston container of the viscous oil sampling and pressurizing device; S12: Place the piston container in the medium-temperature constant-temperature oven; S13: Connect the lower inlet of the piston container to the high-pressure piston pump through a pipeline; S14: Open the medium-temperature constant-temperature oven, set the temperature of the constant-temperature oven to 50 - 80 °C, and keep it constant for more than 2 hours.

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