Oil exploitation sample oil layer sampling equipment

Abstract

The invention belongs to the technical field of oil layer sampling, and discloses oil exploitation sample oil layer sampling equipment which comprises a supporting bottom plate, universal wheels are fixed to the bottom end of the supporting bottom plate, a supporting frame is fixed to the top end of the supporting bottom plate, a servo motor is fixed to the outer portion of the supporting frame, and a cable roller is fixed to the driving end of the servo motor. According to the petroleum sample collection and storage device, through cooperation of structures such as the sampling barrel, the sampling cavity and the mounting cavity, efficient collection and grouped storage of petroleum samples can be achieved, the sampling barrel provides a mounting carrier for a sampling component, and the sampling component is arranged in the sampling cavity; the sampling cavity is used for temporarily storing collected petroleum samples, the air cylinder and the supporting rod are arranged in the mounting cavity, the driving piston moves up and down to generate negative pressure, one-way suction and diversion of the samples are achieved in cooperation with the first one-way valve and the second one-way valve, the two temporary storage cavities store the samples respectively, and finally the effects of sample grouping collection and backflow pollution avoiding are achieved.

Description

Technical Field

[0001] This invention belongs to the field of oil reservoir sampling technology, specifically an oil reservoir sampling device for petroleum extraction. Background Technology

[0002] In oil extraction, accurate acquisition of reservoir fluid properties is a crucial foundation for reservoir evaluation, development planning, and production operation management. Among these, the flow characteristics of crude oil under different temperature conditions, especially its pour point and freeze point parameters, are of significant guiding importance for well extraction method selection, pipeline transportation design, and the formulation of anti-wax and anti-condensation measures. Therefore, it is necessary to reliably sample reservoirs at the well site and analyze the low-temperature flow properties of the samples. Current oil extraction reservoir sampling methods often involve lowering a sampling cylinder into the well to the target reservoir depth using a steel wire or cable, relying on valve opening and closing or pressure difference to collect crude oil samples. Some existing devices lack effective sample grouping and insulation or cooling structures during sampling, making it impossible to classify and preserve samples or control the low-temperature environment after sampling. This leads to wax precipitation or changes in flowability of the samples within a short period, further affecting the accuracy and representativeness of pour point and freeze point tests.

[0003] Publication No. CN112268751B discloses an oil extraction sample layer sampling device, including an inlet pipe, a throttling mechanism, a pressure relief mechanism, a temporary storage tank, a detection mechanism, a sampling valve, a cleaning mechanism, an opening and closing mechanism, a connecting pipe, an outlet pipe, a one-way mechanism, and a filter plate. The upper end of the inlet pipe is fixedly connected to the temporary storage tank, the side wall of the temporary storage tank is fixedly connected to the sampling valve, the inner side wall of the temporary storage tank is fixedly connected to the filter plate, and the side wall of the temporary storage tank is fixedly connected to the outlet pipe. This oil extraction sample layer sampling device can ensure that the pressure inside the pipe is zero during oil sampling, avoiding damage to the sampling valve. It can also automatically clean impurities in the internal oil to prevent blockages, and can detect the real-time pressure of the pipe and record the maximum and minimum pressures, thereby facilitating monitoring of pipe safety and improving extraction safety.

[0004] The device can detect the real-time pressure of the pipeline and record the maximum and minimum pressures. However, it cannot quickly test the pour point and freezing point of the sample after sampling. Therefore, a sample collection device for oil wells is proposed, which can group samples during the oil well sampling process and observe the fluidity of oil samples in a low-temperature environment to test the pour point and freezing point of the oil samples. Summary of the Invention

[0005] To address the problems mentioned in the background section, this invention provides an oil extraction sample reservoir sampling device.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an oil extraction sample layer sampling device, comprising a support base plate, a caster wheel fixed to the bottom end of the support base plate, a support frame fixed to the top end of the support base plate, a servo motor fixed to the outside of the support frame, a cable roller fixed to the drive end of the servo motor, a sampling mechanism fixed to the end of the cable roller, and a pour point measuring mechanism fixed inside the support frame. The sampling mechanism includes a sampling tube, a sampling cavity, and an installation cavity. The sampling tube is fixed to the bottom of the output end of the cable roller. The sampling cavity is opened inside the sampling tube. The installation cavity is opened inside the sampling tube. A cylinder is fixed to the top of the sampling tube. The freezing point measuring mechanism includes a detection box, an observation window, and a condenser tube. The detection box is fixed inside the support frame, the observation window is fixed outside the detection box, the condenser tube is fixed at the bottom of the detection box, and a solenoid valve is installed inside the detection box.

[0007] Preferably, a support rod is fixed to the bottom end of the cylinder, a piston is fixed to the bottom end of the support rod, a first one-way valve is fixed to the bottom end of the sampling cylinder, a second one-way valve is installed inside the sampling cylinder, a temporary storage chamber is opened inside the sampling cylinder, and a discharge cylinder is fixed to the top end of the sampling cylinder.

[0008] Preferably, the inner wall of the sampling chamber is in contact with the outer wall of the piston, the output end of the first one-way valve is connected to the sampling chamber, the input end of the second one-way valve is connected to the sampling chamber, and the output end of the second one-way valve is connected to the temporary storage chamber.

[0009] Preferably, the temporary storage chamber is provided in two sets, and the temporary storage chamber is symmetrically distributed about the central axis of the sampling cylinder. The unloading cylinder is provided in two sets, and the unloading cylinder is symmetrically distributed about the central axis of the sampling cylinder.

[0010] Preferably, an observation camera is fixed inside the detection box, an electric motor is fixed inside the detection box, a transmission gear is fixed to the drive end of the electric motor, a rack is movably connected to the outside of the detection box, a connecting rod is fixed to the bottom end of the rack, and a pressure plate is fixed to the outside of the connecting rod.

[0011] Preferably, the observation windows are provided in four sets, and the observation windows are symmetrically distributed about the central axis of the detection box. The condenser tubes are provided in two sets, and the condenser tubes are symmetrically distributed about the central axis of the detection box. The detection box has a detection chamber inside.

[0012] Preferably, the input end of the solenoid valve is connected to the output end of the unloading cylinder, the output end of the solenoid valve is connected to the detection chamber, and two sets of observation cameras are provided, which are symmetrically distributed about the central axis of the detection box.

[0013] Preferably, the transmission gear has several sets of teeth fixed to its exterior, and the rack has several sets of teeth fixed to its exterior. The transmission gear and the rack are meshed and connected. The rack has two sets of teeth, and the rack is symmetrically distributed about the central axis of the transmission gear.

[0014] Preferably, the outer wall of the connecting rod is in contact with the inner wall of the detection box, the connecting rod and the detection box are slidably connected, and the outer wall of the pressure plate is in contact with the inner wall of the detection box.

[0015] Preferably, four sets of casters are provided, and the casters are symmetrically distributed about the central axis of the supporting base plate. Two sets of support frames are provided, and the support frames are symmetrically distributed about the central axis of the supporting base plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, through the coordinated arrangement of a sampling cylinder, a sampling chamber, and a mounting chamber, enables the device to achieve efficient collection and grouped storage of petroleum samples. The sampling cylinder provides a mounting carrier for the sampling components, the sampling chamber is used to temporarily store the collected petroleum samples, and the mounting chamber contains a cylinder and a support rod that drives a piston to move up and down to generate negative pressure. This, in conjunction with a first one-way valve and a second one-way valve, enables unidirectional sample intake and diversion. The two sets of temporary storage chambers store samples separately, ultimately achieving the effect of grouped sample collection and avoiding backflow contamination.

[0017] This invention, through the combination of a detection box, an observation window, and a condenser tube, enables the device to detect the pour point and freezing point of petroleum samples on-site. The detection chamber inside the detection box holds the grouped samples, the condenser tube achieves gradient cooling, the observation window and observation camera facilitate the observation of sample flowability, and the electric motor drives the pressure plate to push the sample, assisting in judging the critical state of flowability. Ultimately, it achieves the effect of rapid on-site detection and ensures the authenticity of test data. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall sampling state structure of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the detection box of the present invention; Figure 4 For the present invention Figure 3 Enlarged cross-sectional view of a portion of point A in the middle section; Figure 5 For the present invention Figure 4 Enlarged cross-sectional view of section B in the middle section; Figure 6 For the present invention Figure 4 Enlarged cross-sectional view of section C in the middle; Figure 7 This is a schematic diagram of the freezing point measuring mechanism of the present invention; Figure 8 This is a partial structural diagram of the freezing point measuring mechanism of the present invention; Figure 9 For the present invention Figure 8 A magnified schematic diagram of a partial cross-section at point D.

[0019] In the diagram: 1. Support base plate; 2. Casters; 3. Support frame; 4. Servo motor; 5. Cable roller; 6. Sampling mechanism; 601. Sampling cylinder; 602. Sampling chamber; 603. Mounting chamber; 604. Cylinder; 605. Support rod; 606. Piston; 607. First check valve; 608. Second check valve; 609. Temporary storage chamber; 610. Unloading cylinder; 7. Freezing point measuring mechanism; 701. Detection box; 702. Observation window; 703. Condenser; 704. Solenoid valve; 705. Observation camera; 706. Electric motor; 707. Transmission gear; 708. Rack; 709. Connecting rod; 710. Pressure plate. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figures 1 to 9 As shown, the present invention provides an oil layer sampling device for oil extraction, including a support base plate 1, a caster wheel 2 fixed to the bottom end of the support base plate 1, a support frame 3 fixed to the top end of the support base plate 1, a servo motor 4 fixed to the outside of the support frame 3, a cable roller 5 fixed to the drive end of the servo motor 4, a sampling mechanism 6 fixed to the end of the cable roller 5, and a pour point measuring mechanism 7 fixed inside the support frame 3. The caster wheel 2 is arranged in four sets and is symmetrically distributed about the central axis of the support base plate 1. The support frame 3 is arranged in two sets and is symmetrically distributed about the central axis of the support base plate 1.

[0022] The above scheme is adopted: by pushing the device, it is moved above the sampling hole by the universal wheel 2, and the servo motor 4 is started to lower the cable roller 5, and then the sampling cylinder 601 is lowered, and the oil is sampled through the sampling cylinder 601.

[0023] like Figures 1 to 7As shown, the sampling mechanism 6 includes a sampling cylinder 601, a sampling chamber 602, and a mounting cavity 603. The sampling cylinder 601 is fixed to the bottom end of the output end of the cable roller 5. The sampling chamber 602 and the mounting cavity 603 are both located inside the sampling cylinder 601. A cylinder 604 is fixed to the top end of the sampling cylinder 601, a support rod 605 is fixed to the bottom end of the cylinder 604, and a piston 606 is fixed to the bottom end of the support rod 605. A first one-way valve 607 is fixed to the bottom end of the sampling cylinder 601, and a second one-way valve 608 is installed inside the sampling cylinder 601. The sample cylinder 601 has a temporary storage chamber 609 inside. The top of the sampling cylinder 601 is fixed with a discharge cylinder 610. The inner wall of the sampling chamber 602 is attached to the outer wall of the piston 606. The output end of the first one-way valve 607 is connected to the sampling chamber 602. The input end of the second one-way valve 608 is connected to the sampling chamber 602. The output end of the second one-way valve 608 is connected to the temporary storage chamber 609. There are two sets of temporary storage chambers 609. The temporary storage chambers 609 are symmetrically distributed about the central axis of the sampling cylinder 601. There are two sets of discharge cylinders 610. The discharge cylinders 610 are symmetrically distributed about the central axis of the sampling cylinder 601.

[0024] The above scheme is adopted as follows: After the sampling cylinder 601 is inserted into the oil, the cylinder 604 is activated to drive the support rod 605 and piston 606 to move upward, thereby generating negative pressure. This allows the oil to enter the sampling chamber 602 through the first one-way valve 607, which prevents the oil from flowing back out. After sampling, the cylinder 604 is activated to drive the support rod 605 and piston 606 to press down, squeezing out the oil. This pressurizes the oil, causing it to enter the temporary storage chamber 609 through the second one-way valve 608, which also prevents the oil from flowing back. This process is repeated until the temporary storage chamber 609 and the unloading cylinder 610 are filled. A solenoid valve 704 is provided at the connection between the unloading cylinder 610 and the solenoid valve 704.

[0025] like Figures 1 to 9As shown, the freezing point measuring mechanism 7 includes a detection box 701, an observation window 702, and a condenser tube 703. The detection box 701 is fixed inside the support frame 3. The observation window 702 is fixed to the outside of the detection box 701. The condenser tube 703 is fixed to the bottom of the detection box 701. A solenoid valve 704 is installed inside the detection box 701. An observation camera 705 is fixed inside the detection box 701. An electric motor 706 is fixed inside the detection box 701. A transmission gear 707 is fixed to the drive end of the electric motor 706. A rack 708 is movably connected to the outside of the detection box 701. A connecting rod 709 is fixed to the bottom of the rack 708. A pressure plate 710 is fixed to the outside of the connecting rod 709. Four sets of observation windows 702 are provided, and the observation windows 702 are symmetrically distributed about the central axis of the detection box 701. Two sets of condenser tubes 703 are provided, and the condenser tubes 703 are symmetrically distributed about the central axis of the detection box 701. A detection chamber is provided inside the detection box 701.

[0026] like Figures 1 to 9 As shown, the input end of the solenoid valve 704 is connected to the output end of the unloading cylinder 610, and the output end of the solenoid valve 704 is connected to the detection chamber. Two sets of observation cameras 705 are provided, and the observation cameras 705 are symmetrically distributed about the central axis of the detection box 701. Several sets of teeth are fixed on the outside of the transmission gear 707, and several sets of teeth are fixed on the outside of the rack 708. The transmission gear 707 and the rack 708 are meshed and connected. Two sets of racks 708 are provided, and the racks 708 are symmetrically distributed about the central axis of the transmission gear 707. The outer wall of the connecting rod 709 is attached to the inner wall of the detection box 701, and the connecting rod 709 and the detection box 701 are slidably connected. The outer wall of the pressure plate 710 is attached to the inner wall of the detection box 701.

[0027] The above scheme is adopted as follows: After the sample is collected, the sampling cylinder 601 is pulled up so that the unloading cylinder 610 is inserted into the detection box 701. At this time, the solenoid valve 704 outside the unloading cylinder 610 is connected to the opening inside the detection box 701, and the solenoid valve 704 is controlled to open, so that the oil sample inside the unloading cylinder 610 that is higher than the solenoid valve 704 enters the interior of the detection box 701. The remaining oil sample is used to test other properties. The condenser 703 is started to gradually pressurize and cool the oil sample. At the same time, the electric motor 706 is started to drive the transmission gear 707 to rotate back and forth, which in turn drives the two sets of racks 708, the rack 708 and the pressure plate 710 to move back and forth, so that the two sets of oil samples inside the detection box 701 are pushed by the pressure plate 710.

[0028] The working principle and usage process of this invention are as follows: First, the pushing device moves the device to the top of the sampling hole via the universal wheel 2, and the servo motor 4 is started to lower the cable roller 5. After the sampling cylinder 601 probes into the oil, the cylinder 604 is started to drive the support rod 605 and piston 606 to move upward, thereby generating negative pressure. This allows the oil to enter the sampling chamber 602 through the first one-way valve 607, which prevents the oil from flowing back out. After sampling, the cylinder 604 is started to drive the support rod 605 and piston 606 to press down, squeezing out the extracted oil. This pressurizes the oil, causing it to enter the temporary storage chamber 609 through the second one-way valve 608, which also prevents the oil from flowing back out. This process is repeated until the temporary storage chamber 609 and the unloading cylinder 610 are filled. A solenoid valve 704 is provided at the connection between the unloading cylinder 610 and the solenoid valve 704 to prevent the collected oil sample from flowing out.

[0029] After the sample collection is completed, the sampling cylinder 601 is pulled up so that the unloading cylinder 610 is inserted into the test box 701. At this time, the solenoid valve 704 on the outside of the unloading cylinder 610 is connected to the opening inside the test box 701, and the solenoid valve 704 is opened, so that the oil sample inside the unloading cylinder 610 that is higher than the solenoid valve 704 enters the interior of the test box 701. The remaining oil sample is used to test other properties. The condenser 703 is started to gradually pressurize and cool the oil sample. At the same time, the electric motor 706 is started to drive the transmission gear 707 to rotate back and forth, which in turn drives the two sets of racks 708, racks 708 and pressure plates 710 to move back and forth. This pushes the two sets of oil samples inside the test box 701 by the pressure plates 710, so that the staff can observe the temperature at which the oil sample loses its fluidity or the lowest temperature at which it can flow through the observation window 702, and thus determine the pour point or freezing point of the oil sample.

[0030] The support base plate 1 provides the installation foundation for the entire device. Four sets of symmetrically distributed casters 2 enable the device to move and position flexibly, adapting to different oil well sampling sites. Two sets of symmetrical support frames 3 are fixed to the top of the support base plate 1, providing stable support for the servo motor 4, cable roller 5 and pour point measuring mechanism 7, ensuring the structural stability of the sampling and testing process.

[0031] The sampling chamber 602 inside the sampling cylinder 601 is tightly fitted to the outer wall of the piston 606 to ensure sealing when negative pressure is generated. The cylinder 604 drives the support rod 605 to drive the piston 606 to move up and down reciprocally. When it moves upward, a negative pressure is formed in the sampling chamber 602, and oil flows in unidirectionally through the first one-way valve 607. When it moves downward, the pressure in the sampling chamber 602 increases, and the oil is diverted to two sets of symmetrical temporary storage chambers 609 through the second one-way valve 608. The first check valve 607 and the second check valve 608 respectively restrict the backflow of oil to ensure the continuity of the sampling process and the purity of the sample. The unloading cylinder 610 is connected to the temporary storage chamber 609. After sampling is completed, the servo motor 4 drives the cable roller 5 in the reverse direction to retract the cable and pull the sampling cylinder 601 to the corresponding position of the test box 701. After the unloading cylinder 610 is inserted into the test box 701, the solenoid valve 704 opens and the oil sample flows into the test chamber inside the test box 701 along the channel. The remaining sample is stored in the temporary storage chamber 609 and can be used for other performance tests.

[0032] During the testing process, the cooling parameters of the condenser 703 are controlled to gradually reduce the temperature inside the testing chamber 701 according to a preset gradient. The oil sample changes its flow state within the testing chamber as the temperature changes. The pressure plate 710, driven by the rack 708, applies a pushing force to the sample. When the oil sample stops moving under the push of the pressure plate 710, the temperature parameters inside the testing chamber 701 are recorded as the pour point data of the oil sample. When the oil sample can still move under the push of the pressure plate 710 at low temperatures, the corresponding temperature parameters are recorded as the pour point data of the oil sample. At the same time, the observation window 702 works in conjunction with the observation camera 705, allowing staff to monitor the flow state of the oil sample in real time from outside the testing chamber 701 and record the testing process. The test data can be used for subsequent analysis. The pressure plate 710 slides against the inner wall of the testing chamber 701, maintaining a consistent force direction during the sample pushing process, which facilitates the determination of whether the sample has moved.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sample collection device for oil reservoirs in oil extraction, comprising a supporting base plate (1), characterized in that: The bottom end of the support base plate (1) is fixed with a caster wheel (2), the top end of the support base plate (1) is fixed with a support frame (3), the outside of the support frame (3) is fixed with a servo motor (4), the drive end of the servo motor (4) is fixed with a cable roller (5), the end of the cable roller (5) is fixed with a sampling mechanism (6), and the inside of the support frame (3) is fixed with a freezing point measuring mechanism (7). The sampling mechanism (6) includes a sampling cylinder (601), a sampling chamber (602), and a mounting chamber (603). The sampling cylinder (601) is fixed at the bottom of the output end of the cable roller (5). The sampling chamber (602) is opened inside the sampling cylinder (601). The mounting chamber (603) is opened inside the sampling cylinder (601). A cylinder (604) is fixed at the top of the sampling cylinder (601). The freezing point measuring mechanism (7) includes a detection box (701), an observation window (702) and a condenser tube (703). The detection box (701) is fixed inside the support frame (3). The observation window (702) is fixed outside the detection box (701). The condenser tube (703) is fixed at the bottom of the detection box (701). A solenoid valve (704) is installed inside the detection box (701).

2. The oil extraction sample reservoir sampling device according to claim 1, characterized in that: A support rod (605) is fixed to the bottom end of the cylinder (604), a piston (606) is fixed to the bottom end of the support rod (605), a first one-way valve (607) is fixed to the bottom end of the sampling cylinder (601), a second one-way valve (608) is installed inside the sampling cylinder (601), a temporary storage chamber (609) is opened inside the sampling cylinder (601), and a discharge cylinder (610) is fixed to the top end of the sampling cylinder (601).

3. The oil extraction sample reservoir sampling device according to claim 2, characterized in that: The inner wall of the sampling chamber (602) is in contact with the outer wall of the piston (606). The output end of the first one-way valve (607) is connected to the sampling chamber (602), the input end of the second one-way valve (608) is connected to the sampling chamber (602), and the output end of the second one-way valve (608) is connected to the temporary storage chamber (609).

4. The oil extraction sample reservoir sampling device according to claim 2, characterized in that: The temporary storage chamber (609) is provided in two sets, and the temporary storage chamber (609) is symmetrically distributed about the central axis of the sampling cylinder (601). The unloading cylinder (610) is provided in two sets, and the unloading cylinder (610) is symmetrically distributed about the central axis of the sampling cylinder (601).

5. The oil extraction sample reservoir sampling device according to claim 1, characterized in that: An observation camera (705) is fixed inside the detection box (701). An electric motor (706) is fixed inside the detection box (701). A transmission gear (707) is fixed to the drive end of the electric motor (706). A rack (708) is movably connected to the outside of the detection box (701). A connecting rod (709) is fixed to the bottom end of the rack (708). A pressure plate (710) is fixed to the outside of the connecting rod (709).

6. The oil extraction sample reservoir sampling device according to claim 5, characterized in that: The observation window (702) has four sets, and the observation window (702) is symmetrically distributed about the central axis of the detection box (701). The condenser tube (703) has two sets, and the condenser tube (703) is symmetrically distributed about the central axis of the detection box (701). The detection box (701) has a detection chamber inside.

7. The oil extraction sample reservoir sampling device according to claim 5, characterized in that: The input end of the solenoid valve (704) is connected to the output end of the unloading cylinder (610), and the output end of the solenoid valve (704) is connected to the detection chamber. Two sets of observation cameras (705) are provided, and the observation cameras (705) are symmetrically distributed about the central axis of the detection box (701).

8. The oil extraction sample reservoir sampling device according to claim 5, characterized in that: The transmission gear (707) has several sets of teeth fixed on its exterior, and the rack (708) has several sets of teeth fixed on its exterior. The transmission gear (707) and the rack (708) are meshed and connected. The rack (708) has two sets of teeth, and the rack (708) is symmetrically distributed about the central axis of the transmission gear (707).

9. The oil extraction sample reservoir sampling device according to claim 5, characterized in that: The outer wall of the connecting rod (709) is attached to the inner wall of the detection box (701), the connecting rod (709) and the detection box (701) are slidably connected, and the outer wall of the pressure plate (710) is attached to the inner wall of the detection box (701).

10. The oil extraction sample reservoir sampling device according to claim 1, characterized in that: The universal wheels (2) are provided in four sets, and the universal wheels (2) are symmetrically distributed about the central axis of the supporting base plate (1). The support frame (3) is provided in two sets, and the support frame (3) is symmetrically distributed about the central axis of the supporting base plate (1).

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