Low-temperature closed storage device for tight oil rock core sample
By designing a low-temperature sealed constant temperature device and simulation system, the problem of lack of actual working conditions of core sample storage devices is solved, and the stable storage of samples and rapid environmental recovery are achieved to ensure the accuracy of the test data.
Patent Information
- Application Number
- CN202422430881.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-08-08
- Estimated Expiration
- 2034-10-09
AI Technical Summary
In the prior art, the core sample storage device lacks the actual working environment, which destroys the high-pressure environment during sampling and affects the accuracy of the test data, and cannot quickly restore sample stability.
A storage device including a low-temperature sealed constant temperature device, a formation environment simulation system, a pressure control system and a pressure relief system are designed to simulate the actual working conditions of core samples and quickly restore the storage environment through a high-pressure pump and a pressure relief valve.
Provide a stable low-temperature closed storage environment, simulate the actual working conditions of core samples, ensure sample stability, and quickly restore the storage environment to prevent sample damage and ensure the accuracy of test data.
Smart Images
Figure CN223200702U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a storage device, in particular to a low-temperature sealed storage device for tight oil core samples. Background Art
[0002] Core samples are important materials for studying the relevant characteristics of tight oil cores, and usually require complex experimental tests. However, the experimental tests cannot be completed quickly and simultaneously. Therefore, the core samples need to be preserved. In the existing technology, core samples are usually directly stored in sealed tanks, which lack the actual working environment of the core samples. There are also related technical records of storing them in high-pressure sealed tanks. However, when sampling the core samples, the high-pressure environment of the high-pressure sealed tank will be destroyed. If the high-pressure environment is to be restored, it is usually necessary to use other complex equipment to complete it, and even cause the unused core samples to fail due to long-term exposure, seriously affecting the accuracy of the subsequent test data results. Summary of the Invention
[0003] In view of the above defects or improvement needs of the prior art, the utility model provides a low-temperature sealed storage device for tight oil core samples.
[0004] The technical solution of the utility model is:
[0005] A low-temperature sealed storage device for tight oil core samples, comprising a low-temperature sealed constant temperature device with a built-in tight oil core sample; the inlet end of the low-temperature sealed constant temperature device is connected to a formation environment simulation system; the formation environment simulation system comprises a formation environment simulation device; the inlet end of the formation environment simulation device is connected to a pressure control system, and the outlet end thereof is connected to the low-temperature sealed constant temperature device; the formation environment simulation device comprises a formation water storage device and a nitrogen storage device arranged in parallel; the inlet ends of the formation water storage device and the nitrogen storage device are both connected to the pressure control system, and the outlet ends of the formation water storage device and the nitrogen storage device are both connected to the low-temperature sealed constant temperature device.
[0006] The low-temperature, sealed, constant-temperature device is also connected to a pressure-maintaining system; the pressure-maintaining system includes a first high-pressure pump.
[0007] The low-temperature sealed constant temperature device is also connected to a pressure relief system; the pressure relief system includes a back pressure valve; one end of the back pressure valve is connected to the low-temperature sealed constant temperature device, one end is connected to a second high-pressure pump, and one end is connected to a flow measuring device.
[0008] The pressure control system includes a high-pressure gas cylinder, a pressure controller and a pressure multiplier group connected in sequence; the pressure multiplier group includes two pressure multipliers arranged in parallel, the inlet ends of the two pressure multipliers are both connected to the pressure controller, and the outlet ends of the two pressure multipliers are connected to the formation water storage device and the nitrogen storage device after mixing.
[0009] The nitrogen storage device includes a nitrogen bottle and a humidifier connected to the nitrogen bottle; the inlet end of the nitrogen bottle is connected to the outlet end of a pressure multiplier thereof, and the outlet end of the humidifier is connected to a low-temperature sealed constant temperature device.
[0010] The tight oil core sample is clamped in a low-temperature, sealed constant temperature device through a core clamp.
[0011] The outlet ends of the formation water storage device and the humidifier are mixed through a connecting pipeline, and the connecting pipeline passes through a low-temperature sealed constant temperature device and is connected to the core clamp; a first throttle valve and a first pressure gauge are provided on the connecting pipeline.
[0012] The first high-pressure pump is connected to the core clamp through a pressure-maintaining pipeline passing through a low-temperature, sealed, and constant-temperature device; a second throttle valve and a second pressure gauge are also provided on the pressure-maintaining pipeline between the first high-pressure pump and the low-temperature, sealed, and constant-temperature device; the second high-pressure pump is connected to the back-pressure valve through a pressure-relief pipeline; a third throttle valve and a third pressure gauge are provided on the pressure-relief pipeline.
[0013] The low-temperature sealed constant temperature device is a constant temperature box.
[0014] The flow measurement device is a wet flow meter.
[0015] The technical effects of the utility model are:
[0016] The utility model can not only provide a relatively stable low-temperature sealed storage environment, but also well simulate the actual working conditions of tight oil core samples; when a portion of the tight oil core sample is extracted at one time, the remaining tight oil core sample can also be quickly restored to a stable low-temperature sealed environment, thereby ensuring the stability of the sample. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic structural diagram of a low-temperature sealed storage device for tight oil core samples according to the present invention.
[0018] Figure numerals: 1. High-pressure gas cylinder; 2. Pressure controller; 3. Formation water storage device; 4. Humidifier; 5. Nitrogen cylinder; 6. Pressure gauge; 7. First high-pressure pump; 8. Second high-pressure pump; 9. Back pressure valve; 10. Wet flow meter; 11. Core holder; 12. Constant temperature box; 13. Pressure multiplier; 14. Tight oil core sample. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
[0020] Example 1
[0021] A low-temperature sealed storage device for tight oil core samples, comprising a low-temperature sealed constant temperature device with a built-in tight oil core sample 14; the inlet end of the low-temperature sealed constant temperature device is connected to a formation environment simulation system; the formation environment simulation system comprises a formation environment simulation device; the inlet end of the formation environment simulation device is connected to a pressure control system, and the outlet end thereof is connected to the low-temperature sealed constant temperature device; the formation environment simulation device comprises a formation water storage device 3 and a nitrogen storage device arranged in parallel; the inlet ends of the formation water storage device 3 and the nitrogen storage device are both connected to the pressure control system, and the outlet ends of the formation water storage device 3 and the nitrogen storage device are both connected to the low-temperature sealed constant temperature device.
[0022] The specific implementation process of this embodiment is as follows:
[0023] The low-temperature, sealed constant temperature device can provide a low-temperature, sealed storage environment for the tight oil core sample 14 that needs to be preserved. The low temperature of the low-temperature, sealed constant temperature device is achieved by cooling the low-temperature, sealed constant temperature device through the low-temperature nitrogen inside the nitrogen storage device. In addition, nitrogen is a relatively stable inert gas and generally does not dissolve in the oil layer inside the tight oil core sample 14. That is, the nitrogen storage device not only provides a reliable low-temperature environment for the low-temperature, sealed constant temperature device, but also does not extract or drive the crude oil inside the tight oil core sample 14. The pressure control system provides a relatively stable high-pressure environment for the low-temperature, sealed constant temperature device. The present invention improves the actual working environment of the tight oil core sample 14 for the tight oil core sample 14 and provides a reliable guarantee for the stability of the tight oil core sample 14.
[0024] Example 2
[0025] In accordance with Example 1, the invention further comprises: the low-temperature, sealed, and constant-temperature device is further connected to a pressure-maintaining system; the pressure-maintaining system includes a first high-pressure pump 7. The first high-pressure pump 7 is a redundant high-pressure pump. When the pressure in the low-temperature, sealed, and constant-temperature device is insufficient, the first high-pressure pump 7 is activated to provide a temporary high-pressure environment for the low-temperature, sealed, and constant-temperature device.
[0026] Example 3
[0027] On the basis of Example 2, it also includes: the low-temperature sealed constant temperature device is also connected to a pressure relief system; the pressure relief system includes a back pressure valve 9; one end of the back pressure valve 9 is connected to the low-temperature sealed constant temperature device, one end is connected to the second high-pressure pump 8, and one end is connected to the flow measuring device; when it is necessary to take out the tight oil core sample 14 in the low-temperature sealed constant temperature device, the back pressure valve 9 is opened by the second high-pressure pump 8, so that the internal pressure of the low-temperature sealed constant temperature device is slowly released to avoid sudden opening causing cracks or other damage to the tight oil core sample 14; the flow measuring device can observe the release of the internal pressure of the low-temperature sealed constant temperature device during pressure relief. When the value displayed by the flow measuring device remains constant, it means that the low-temperature sealed constant temperature device can be opened to take out the tight oil core sample 14 for subsequent related experiments.
[0028] Example 4
[0029] On the basis of Example 3, it also includes: the pressure control system includes a high-pressure gas cylinder 1, a pressure controller 2 and a pressure multiplier 13 group connected in sequence; the pressure multiplier 13 group includes two pressure multipliers 13 arranged in parallel, the inlet ends of the two pressure multipliers 13 are both connected to the pressure controller 2, and the outlet ends of the two pressure multipliers 13 are connected to the formation water storage device 3 and the nitrogen storage device after mixing; the nitrogen storage device includes a nitrogen cylinder 5 and a humidifier 4 connected to the nitrogen cylinder 5, the humidifier 4 can provide a certain humidity for the nitrogen, and the atomized water sprayed by the humidifier 4 can be converted from gas to liquid under appropriate circumstances, thereby avoiding the formation of liquid nitrogen or high-temperature nitrogen.
[0030] The pressure controller 2 is used to adjust the pressure inside the low-temperature, sealed, and constant-temperature device; the pressure of an ordinary high-pressure gas cylinder 1 cannot reach the pressure deep in the geology, and the high-pressure gas cylinder 1 with a higher pressure is relatively expensive, so a pressure multiplier 13 group is set up to linearly increase the pressure inside the high-pressure gas cylinder 1 through the pressure multiplier 13 group; after the tight oil core sample 14 is stored in the low-temperature, sealed, and constant-temperature device for a long time, it will generally cause leakage of the high-pressure gas cylinder 1, or leakage at the pressure multiplier 13 group; then the first high-pressure pump 7 is started to provide a temporary high-pressure environment for the low-temperature, sealed, and constant-temperature device.
[0031] Example 5
[0032] On the basis of Example 4, it also includes: the tight oil core sample 14 is clamped in a low-temperature, sealed, constant-temperature device by a core clamp 11; since the internal environment of the low-temperature, sealed, constant-temperature device simulates the existence environment of the tight oil core sample 14 in the formation, after a long time, some substances will precipitate or stratify at the bottom of the low-temperature, sealed, constant-temperature device, which may cause the various surfaces of the tight oil core sample 14 to not be in a relatively uniform preservation environment; the use of the core clamp 11 prevents the tight oil core sample 14 from sinking to the bottom of the low-temperature, sealed, constant-temperature device under the action of gravity, so that the various surfaces of the tight oil core sample 14 can be in a relatively uniform preservation environment.
[0033] Example 6
[0034] Based on Example 5, the following further comprises: the outlets of the formation water storage device 3 and the humidifier 4 are mixed via a connecting pipeline, which passes through a low-temperature, sealed constant temperature device and is connected to the core holder 11; the connecting pipeline is provided with a first throttle valve and a first pressure gauge 6; when the pressure indicated by the first pressure gauge 6 is insufficient, the first high-pressure pump 7 can be activated to provide a temporary high-pressure environment for the low-temperature, sealed constant temperature device. The first high-pressure pump 7 is connected to the core holder 11 via a pressure-maintaining pipeline, which passes through the low-temperature, sealed constant temperature device; a second throttle valve and a second pressure gauge are also provided on the pressure-maintaining pipeline between the first high-pressure pump 7 and the low-temperature, sealed constant temperature device; the second high-pressure pump 8 is connected to the back-pressure valve 9 via a pressure-relief pipeline; the pressure-relief pipeline is provided with a third throttle valve and a third pressure gauge. The low-temperature, sealed constant temperature device is a constant temperature box 12. The flow measurement device is a wet flow meter 10.
[0035] The devices involved in the present invention are all commercially available products; for example, the model of the pressure controller 2 is ACU10P-M pressure controller.
[0036] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.
Claims
1. A low-temperature sealed storage device for tight oil core samples, comprising a low-temperature sealed constant temperature device, wherein the tight oil core sample (14) is housed; characterized in that: The inlet end of the low-temperature, sealed, and constant-temperature device is connected to a formation environment simulation system; the formation environment simulation system includes a formation environment simulation device; the inlet end of the formation environment simulation device is connected to a pressure control system, and its outlet end is connected to the low-temperature, sealed, and constant-temperature device; the formation environment simulation device includes a formation water storage device (3) and a nitrogen storage device arranged in parallel; the inlet ends of the formation water storage device (3) and the nitrogen storage device are both connected to the pressure control system, and the outlet ends of the formation water storage device (3) and the nitrogen storage device are both connected to the low-temperature, sealed, and constant-temperature device.
2. The low-temperature sealed storage device for tight oil core samples according to claim 1, characterized in that: The low-temperature sealed constant temperature device is also connected to a pressure maintaining system; the pressure maintaining system includes a first high-pressure pump (7).
3. The low-temperature sealed storage device for tight oil core samples according to claim 2, characterized in that: The low-temperature sealed constant temperature device is also connected to a pressure relief system; the pressure relief system includes a back pressure valve (9); one end of the back pressure valve (9) is connected to the low-temperature sealed constant temperature device, one end is connected to a second high-pressure pump (8), and one end is connected to a flow measurement device.
4. The low-temperature sealed storage device for tight oil core samples according to claim 1, characterized in that: The pressure control system comprises a high-pressure gas cylinder (1), a pressure controller (2) and a pressure multiplier (13) group connected in sequence; the pressure multiplier (13) group comprises two pressure multipliers (13) arranged in parallel, the inlet ends of the two pressure multipliers (13) are both connected to the pressure controller (2), and the outlet ends of the two pressure multipliers (13) are connected to a formation water storage device (3) and a nitrogen storage device after mixing.
5. The low-temperature sealed storage device for tight oil core samples according to claim 3, characterized in that: The nitrogen storage device comprises a nitrogen bottle (5) and a humidifier (4) connected to the nitrogen bottle (5); the inlet end of the nitrogen bottle (5) is connected to the outlet end of a pressure multiplier (13) thereof, and the outlet end of the humidifier (4) is connected to a low-temperature sealed constant temperature device.
6. The low-temperature sealed storage device for tight oil core samples according to claim 5, characterized in that: The tight oil core sample (14) is clamped in a low-temperature, sealed, constant-temperature device via a core clamp (11).
7. The low-temperature sealed storage device for tight oil core samples according to claim 6, characterized in that: The outlet ends of the formation water storage device (3) and the humidifier (4) are mixed through a connecting pipeline, and the connecting pipeline passes through a low-temperature sealed constant temperature device and is connected to the core clamp (11); a first throttle valve and a first pressure gauge (6) are provided on the connecting pipeline.
8. The low-temperature sealed storage device for tight oil core samples according to claim 7, characterized in that: The first high-pressure pump (7) is connected to the core holder (11) through a pressure-maintaining pipeline passing through a low-temperature sealed constant temperature device; a second throttle valve and a second pressure gauge are also provided on the pressure-maintaining pipeline between the first high-pressure pump (7) and the low-temperature sealed constant temperature device; the second high-pressure pump (8) is connected to the back-pressure valve (9) through a pressure-relief pipeline; a third throttle valve and a third pressure gauge are provided on the pressure-relief pipeline.
9. The low-temperature sealed storage device for tight oil core samples according to claim 1, characterized in that: The low-temperature sealed constant temperature device is a constant temperature box (12).
10. The low-temperature sealed storage device for tight oil core samples according to claim 3, characterized in that: The flow measurement device is a wet flow meter (10).