Heavy oil ground single-phase fluid sampling device
By designing a single-phase fluid sampling device for heavy oil on the surface, and utilizing hydraulic pumps and electric heating technology, the heavy oil sample is kept in a single-phase flow state during the sampling process. This solves the problems of downhole sampling failure and laboratory filtration, and achieves unchanged composition of heavy oil and filtration of impurities, thus meeting the needs of experimental analysis.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- KARAMAY XINKEAO CHEM CO LTD
- Filing Date
- 2025-05-15
- Publication Date
- 2026-04-28
AI Technical Summary
In existing technologies, downhole sampling fails in heavy oil wells, surface sampling may alter the composition of heavy oil, and laboratory analytical instruments with narrow pipeline diameters cannot effectively filter heavy oil samples, resulting in the inability to effectively obtain formation heavy oil fluid samples.
A single-phase fluid sampling device for heavy oil on the ground was designed, including a filter, an intermediate container, a sampling cylinder, and a drive mechanism. The piston is driven by a hydraulic pump, and combined with electric heating and nitrogen pressurization, the heavy oil sample is kept in a single-phase flow state during the sampling process. Impurities are filtered through a 100-micron filter to prevent precipitation and meet the requirements of experimental analysis.
This method enables heavy oil fluid samples to remain in a single-phase flow state during ground sampling, ensuring unchanged composition, filtering impurities, meeting laboratory analysis requirements, and providing a sufficient quantity of single-phase fluid samples.
Smart Images
Figure CN224176171U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heavy oil development technology and is a heavy oil ground single-phase fluid sampling device. Background Technology
[0002] Heavy oil has undergone development processes including steam injection, steam flooding, SAGD (Super Aquatic Energy Depletion), and fire flooding. However, steam injection, as the main development technology, is now in the late stages of high-level development, facing problems such as high energy consumption, low production, high water cut, and low recovery rate. To ensure the continuous and stable production of 4 million tons of heavy oil in Xinjiang Oilfield and to meet the needs of low-carbon, energy-saving, and environmentally friendly practices, heavy oil development technicians are actively exploring heavy oil conversion development methods and green, low-carbon cold recovery technologies. Cold recovery of heavy oil commonly employs screw pump lifting. To facilitate the extraction of single-phase formation heavy oil fluid samples using screw pumps, a sampling device needs to be connected to the surface to obtain these samples.
[0003] Downhole sampling is ineffective in heavy oil wells, so it is not permissible to obtain formation fluid samples using surface sampling methods that are not recognized by the industry. Surface sampling may alter the composition of heavy oil, thus failing to effectively obtain heavy oil formation fluid samples, and consequently, the analysis data will not be accepted by oilfield developers.
[0004] Furthermore, laboratory instruments for analyzing heavy oil have relatively narrow pipeline diameters, which requires the heavy oil sample to contain fine sand particles. The heavy oil sample must be able to be filtered on-site, as laboratories often lack the capability to filter heavy oil. Summary of the Invention
[0005] This invention provides a surface single-phase fluid sampling device for heavy oil, which overcomes the shortcomings of the prior art. It belongs to the field sampling device for obtaining single-phase formation heavy oil samples and can keep the formation heavy oil fluid sample in a single-phase flow state during the surface sampling process, keeping the composition of the heavy oil fluid unchanged.
[0006] The technical solution of this utility model is achieved through the following measures: a heavy oil surface single-phase fluid sampling device, comprising: a filter, an intermediate container, a sampling cylinder and a driving mechanism, wherein a piston capable of moving left and right is provided inside the intermediate container, and the driving mechanism is used to drive the piston to move to the right, a first sampling pipeline is fixedly connected to the left end of the intermediate container, a filter-to-be-filtered pipeline is fixedly connected between the first sampling pipeline and the inlet of the filter, a second sampling pipeline is fixedly connected between the outlet of the filter and the inlet of the sampling cylinder, a main valve is connected in series on the first sampling pipeline between the inlet end of the first sampling pipeline and the filter-to-be-filtered pipeline, a valve is connected in series on the first sampling pipeline between the left end of the intermediate container and the filter-to-be-filtered pipeline, and valves are connected in series on both the filter-to-be-filtered pipeline and the second sampling pipeline.
[0007] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:
[0008] The aforementioned sampling cylinder, first sampling line, filter line, second sampling line, and valves on the first sampling line, filter line, and second sampling line are all wrapped with electric heating tape.
[0009] The aforementioned driving mechanism includes a hydraulic pump. A hydraulic pipeline is fixedly connected between the outlet of the hydraulic pump and the right port of the intermediate container. A drain pipeline is fixedly connected to the hydraulic pipeline. A valve is connected in series on the hydraulic pipeline between the drain pipeline and the outlet of the hydraulic pump. A valve is also connected in series on the drain pipeline.
[0010] The sampling cylinder is fixedly connected to a nitrogen pressurization pipeline, and a valve is installed on the nitrogen pressurization pipeline.
[0011] The discharge end of the above filter is fixedly connected to a discharge pipeline, and a valve is connected in series on the discharge pipeline; the filter's filtration accuracy is 100 micrometers.
[0012] The bottom of the sampling cylinder is fixedly connected to a discharge pipeline, and a valve is connected in series on the discharge pipeline.
[0013] Pressure monitoring instruments are fixedly installed on both the first and second sampling pipelines.
[0014] The diameters of the first sampling pipeline, the filter pipeline, and the discharge pipeline are all larger than the diameter of the second sampling pipeline.
[0015] This utility model has the following advantages:
[0016] First, it can ensure that the heavy oil fluid sample from the formation remains in a single-phase flow state during the ground sampling process. Under this state, the gums, asphaltenes, and waxes in the heavy oil will not precipitate out, thus ensuring that the composition of the fluid remains unchanged.
[0017] Second, it ensures that the heavy oil formation fluid samples transferred to the laboratory do not contain too many coarse sand particles, thus ensuring the smooth progress of experimental analysis.
[0018] Third, it can backwash to clear blockages after the filter screen becomes clogged, allowing the sampling operation to continue.
[0019] Fourth, the electric heating belt can keep the fluid flowing during the sampling process;
[0020] Fifth, it is possible to obtain a sufficient quantity of single-phase fluid samples from heavy oil formations for analysis of other components. Attached Figure Description
[0021] Appendix Figure 1 This is one of the process flow diagrams of this utility model.
[0022] Appendix Figure 2This is the second schematic diagram of the process flow of this utility model.
[0023] Appendix Figure 3 This is the third schematic diagram of the process flow of this utility model.
[0024] The codes in the attached diagram are as follows: 1 is the intermediate container, 2 is the filter, 3 is the sampling cylinder, 4 is the piston, 5 is the first sampling line, 6 is the line to be filtered, 7 is the second sampling line, 8 is the discharge line, 9 is the discharge line, 10 is the hydraulic pump, 11 is the hydraulic line, 12 is the drain line, 13 is the nitrogen pressurization line, 14 is the pressure gauge, 15 is the main valve, 16 is the valve, and 17 is the filter screen. Detailed Implementation
[0025] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.
[0026] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.
[0027] The terms "first" and "second" are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that they must have a specific order.
[0028] The present invention will be further described below with reference to the embodiments and accompanying drawings:
[0029] Example 1: As shown in the attached document Figure 1 As shown, the heavy oil surface single-phase fluid sampling device includes an intermediate container 1, a filter 2, a sampling cylinder 3, and a driving mechanism. A piston 4 that can move left and right is installed inside the intermediate container 1. The driving mechanism is used to drive the piston 4 to move to the right. A first sampling pipeline 5 is fixedly connected to the left end of the intermediate container 1. A filter pipeline 6 is fixedly connected between the first sampling pipeline 5 and the inlet of the filter 2. A second sampling pipeline 7 is fixedly connected between the outlet of the filter 2 and the inlet of the sampling cylinder 3. A main valve 15 is connected in series on the first sampling pipeline 5 between the inlet end of the first sampling pipeline 5 and the filter pipeline 6. A valve 16 is connected in series on the first sampling pipeline 5 between the left end of the intermediate container 1 and the filter pipeline 6. Valves 16 are also connected in series on the filter pipeline 6 and the second sampling pipeline 7.
[0030] Using this device for heavy oil sampling can meet the requirements of subsequent experimental analysis that the heavy oil sample is free of sand (or contains very little sand) and has an unchanged composition.
[0031] The above-mentioned heavy oil surface single-phase fluid sampling device can be further optimized and / or improved according to actual needs:
[0032] Example 2: As an optimization of the above example, as needed, the sampling cylinder 3, the first sampling line 5, the filter line 6, the second sampling line 7, and the valves 16 on the first sampling line 5, the filter line 6, and the second sampling line 7 are all wrapped with electric heating tape.
[0033] The electric heating element helps maintain the good fluidity of the heavy oil.
[0034] Example 3: As an optimization of the above examples, as shown in the appendix Figure 1 As shown, the drive mechanism includes a hydraulic pump 10. A hydraulic pipeline 11 is fixedly connected between the outlet of the hydraulic pump 10 and the right port of the intermediate container 1. A drain pipeline 12 is fixedly connected to the hydraulic pipeline 11. A valve 16 is connected in series on the hydraulic pipeline 11 between the drain pipeline 12 and the outlet of the hydraulic pump 10. A valve 16 is also connected in series on the drain pipeline 12.
[0035] The drive mechanism can also be other existing, well-known, and commonly used drive mechanisms.
[0036] Example 4: As an optimization of the above embodiments, as shown in the appendix Figure 1 As shown, a nitrogen pressurization pipeline 13 is fixedly connected to the sampling cylinder 3, and a valve 16 is installed on the nitrogen pressurization pipeline 13.
[0037] Example 5: As an optimization of the above embodiments, as shown in the appendix Figure 1 As shown, the discharge end of filter 2 is fixedly connected to discharge pipeline 8, and valve 16 is connected in series on discharge pipeline 8; the filtration accuracy of filter 2 is 100 micrometers.
[0038] Filter 2 can filter out impurities such as fine sand with a diameter or maximum width of 100 micrometers or more.
[0039] Example 6: As an optimization of the above embodiments, as shown in the appendix Figure 1 As shown, the bottom of the sampling cylinder 3 is fixedly connected to the discharge pipeline 9, and a valve 16 is connected in series on the discharge pipeline 9.
[0040] Example 7: As an optimization of the above embodiments, as shown in the appendix Figure 1 As shown, pressure monitoring instruments are fixedly installed on both the first sampling pipeline 5 and the second sampling pipeline 7.
[0041] The pressure monitoring instrument can be a pressure gauge 14.
[0042] Example 8: As an optimization of the above example, the diameters of the first sampling line 5, the filter line 6, and the discharge line 9 are all greater than the diameter of the second sampling line 7, as needed.
[0043] The heavy oil (i.e., sand-bearing single-phase heavy oil formation fluid sample) taken from the well contains sand particles with a large diameter (greater than 100 micrometers). By using the first sampling line 5 with a larger diameter (e.g., φ6mm) and the filter line 6, the sampling requirements of the intermediate container 1 can be met. After filtration, the sand particles in the heavy oil are smaller. At this time, the second sampling line 7 with a smaller diameter (e.g., φ3mm) can be used.
[0044] When this device is implemented, valve 16 can be a ball valve; intermediate container 1 can be a ZR-3 type high-pressure piston 4 container with a working pressure of 16MPa to 70MPa.
[0045] Sampling cylinder 3 uses a PVT sampling cylinder.
[0046] The intermediate container 1, sampling cylinder 3, first sampling line 5, filter line 6, second sampling line 7, and valve 16 on the first sampling line 5, filter line 6, and second sampling line 7 are all made of 314L stainless steel or 316 stainless steel to meet the requirements of using heavy oil containing hydrogen sulfide gas.
[0047] The above technical features constitute various embodiments of this utility model, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.
[0048] The process of using this utility model:
[0049] After closing valve 16 on the second sampling line 7 and hydraulic line 11, the heavy oil (containing 2% to 4% sand) extracted from the formation is transported to the intermediate container 1 via the first sampling line 5 under wellhead pressure. Simultaneously with the heavy oil entering the intermediate container 1, the piston 4 inside the intermediate container 1 moves to the right (e.g., ...). Figure 1 (as shown)
[0050] When the heavy oil in intermediate container 1 reaches the collection requirements, close the main valve 15, the valve 16 on the first sampling line 5 and the discharge line 8, and open the valve 16 on the filter line 6, the second sampling line 7, and the hydraulic line 11. Start the hydraulic pump 10. Under the condition that the hydraulic pressure is greater than the wellhead pressure, drive the piston 4 to move to the left in intermediate container 1, so that the heavy oil fluid sample in intermediate container 1 is filtered by filter 2 and then transferred to the PVT sampling cylinder 3 (e.g., ...). Figure 2 As shown in the figure, by filtering, the sand content in the PVT sampling cylinder 3 is reduced to about 0.1%. When the filtration accuracy of the filter 2 used is 100 micrometers, the sand particle size in the PVT sampling cylinder 3 is below 100 micrometers, which can meet the experimental requirements.
[0051] If sand particles clog the filter screen 17 of filter 2 during the sample transfer process, close the main valve 15 and the valve 16 on the discharge line 8, and open the valve 16 on the nitrogen pressurization line 13. Under the pressure of nitrogen, the heavy oil sample in the sampling cylinder 3 is sequentially transported to the intermediate container 1 through the second sampling line 7, the filter line 6, and the first sampling line 5. Simultaneously, the liquid on the right side of the intermediate container 1 is discharged through the drain line 12. The sand particles clogging the filter screen 17 of filter 2 are removed from the filter screen 17 under the pressure of the pressurized heavy oil sample. After the heavy oil sample transfer is complete, close the valves 16 on the nitrogen line, the first sampling line 5, and the second sampling line 7, and open the valve 16 on the discharge line 8 and the main valve 15. The heavy oil extracted from the formation, under the pressure of the wellhead, carries most of the sand particles clogging the filter screen 17 of filter 2 and is discharged through the discharge line 8 (e.g., Figure 3 As shown in the figure, this achieves the purpose of removing the sand particles clogging the filter screen 17 of filter 2.
[0052] During operation, the PVT sampling cylinder 3, the first sampling line 5, the filter line 6, the second sampling line 7, and the valves 16 on the first sampling line 5, the filter line 6, and the second sampling line 7 are all wrapped with electric heating tape. The electric heating tape is used to heat the heavy oil and keep it in a fluid state.
Claims
1. A heavy oil surface single-phase fluid sampling device, characterized in that... The device includes an intermediate container, a filter, a sampling cylinder, and a drive mechanism. A piston capable of moving left and right is installed inside the intermediate container. The drive mechanism drives the piston to move to the right. A first sampling line is fixedly connected to the left end of the intermediate container. A filter-to-be-filtered pipeline is fixedly connected between the first sampling line and the inlet of the filter. A second sampling line is fixedly connected between the outlet of the filter and the inlet of the sampling cylinder. A main valve is connected in series on the first sampling line between the inlet end of the first sampling line and the filter-to-be-filtered pipeline. A valve is also connected in series on the first sampling line between the left end of the intermediate container and the filter-to-be-filtered pipeline. Valves are also connected in series on both the filter-to-be-filtered pipeline and the second sampling line.
2. The heavy oil surface single-phase fluid sampling device according to claim 1, characterized in that... The sampling cylinder, the first sampling line, the line to be filtered, the second sampling line, and the valves on the first sampling line, the line to be filtered, and the second sampling line are all wrapped with electric heating tape.
3. The heavy oil surface single-phase fluid sampling device according to claim 1 or 2, characterized in that... The drive mechanism includes a hydraulic pump. A hydraulic pipeline is fixedly connected between the outlet of the hydraulic pump and the right port of the intermediate container. A drain pipeline is fixedly connected to the hydraulic pipeline. A valve is connected in series on the hydraulic pipeline between the drain pipeline and the outlet of the hydraulic pump. A valve is also connected in series on the drain pipeline.
4. The heavy oil surface single-phase fluid sampling device according to claim 1 or 2, characterized in that... A nitrogen pressurization pipeline is fixedly connected to the sampling cylinder, and a valve is installed on the nitrogen pressurization pipeline.
5. The heavy oil surface single-phase fluid sampling device according to claim 3, characterized in that... A nitrogen pressurization pipeline is fixedly connected to the sampling cylinder, and a valve is installed on the nitrogen pressurization pipeline.
6. The heavy oil surface single-phase fluid sampling device according to claim 1 or 2, characterized in that... The filter's discharge end is fixedly connected to a discharge pipeline, and a valve is connected in series on the discharge pipeline; or / and the filter's filtration accuracy is 100 micrometers; or / and the bottom of the sampling cylinder is fixedly connected to a discharge pipeline, and a valve is connected in series on the discharge pipeline; or / and pressure monitoring instruments are fixedly installed on both the first sampling pipeline and the second sampling pipeline.
7. The heavy oil surface single-phase fluid sampling device according to claim 3, characterized in that... The filter's discharge end is fixedly connected to a discharge pipeline, and a valve is connected in series on the discharge pipeline; or / and the filter's filtration accuracy is 100 micrometers; or / and the bottom of the sampling cylinder is fixedly connected to a discharge pipeline, and a valve is connected in series on the discharge pipeline; or / and pressure monitoring instruments are fixedly installed on both the first sampling pipeline and the second sampling pipeline.
8. The heavy oil surface single-phase fluid sampling device according to claim 4, characterized in that... The filter's discharge end is fixedly connected to a discharge pipeline, and a valve is connected in series on the discharge pipeline; or / and the filter's filtration accuracy is 100 micrometers; or / and the bottom of the sampling cylinder is fixedly connected to a discharge pipeline, and a valve is connected in series on the discharge pipeline; or / and pressure monitoring instruments are fixedly installed on both the first sampling pipeline and the second sampling pipeline.
9. The heavy oil surface single-phase fluid sampling device according to claim 5, characterized in that... The filter's discharge end is fixedly connected to a discharge pipeline, and a valve is connected in series on the discharge pipeline; or / and the filter's filtration accuracy is 100 micrometers; or / and the bottom of the sampling cylinder is fixedly connected to a discharge pipeline, and a valve is connected in series on the discharge pipeline; or / and pressure monitoring instruments are fixedly installed on both the first sampling pipeline and the second sampling pipeline.
10. The heavy oil surface single-phase fluid sampling device according to claim 9, characterized in that... The diameters of the first sampling pipeline, the pipeline to be filtered, and the discharge pipeline are all larger than the diameter of the second sampling pipeline.