A device for measuring dielectric properties of core

Abstract

This paper provides a core dielectric property measurement device, including a controller and a sample moving structure connected to the controller, a dielectric measurement structure, a data processing structure and a controller; the sample moving structure is used to carry the core sample to be measured and drive the core sample to move relative to the dielectric measurement structure under the control of the controller; the dielectric measurement structure is used to obtain the dielectric property parameters of the core sample under the control of the controller; the data processing structure is connected to the dielectric measurement structure and is used to process the data obtained by the dielectric measurement structure under the control of the controller. Compared with the logging process, the measurement device provided in this paper changes the relative movement relationship between the dielectric measurement structure and the core sample during the dielectric property measurement of the core sample, and can be applied to the dielectric measurement of larger-sized core samples in field environments such as laboratories; and it is conducive to reducing the development and production costs of the measurement device and reducing the workload of the preliminary preparation of the dielectric property measurement.

Description

Technical Field

[0001] The invention relates to the technical field of rock physics, in particular to a device for measuring dielectric properties of a rock core. Background Art

[0002] Dielectric logging is a logging method that uses the differences in dielectric properties between rocks and various fluids to distinguish rock formations. Compared with other conventional rock physical property measurement methods, dielectric property measurement has higher accuracy and is of great significance to the reserve assessment, exploration and development of oil and gas, especially unconventional shale oil and gas resources. After years of development, dielectric logging technology has become relatively mature. Early dielectric logging was a single frequency, and its description of reservoir properties was relatively simple. The multi-frequency dielectric logging instrument launched around 2010 can not only measure the water porosity and residual oil saturation of downhole formations, but also measure the formation water mineralization and reservoir structure parameters.

[0003] The existing methods for measuring the dielectric properties of cores used in laboratory environments include the parallel plate method and the coaxial probe method. The parallel plate method test sample is a flat cylindrical shape with a thickness usually less than 1 cm. The sample surface smoothness is very high and needs to be finely polished using a tool similar to a diamond grinding wheel. The core sample size measured by the coaxial probe method is also small. For example, the diameter and length of the core sample used by Chen and Heidari are 1 inch and 0.5 inch respectively (SPE ResEval&Eng 21(01):202–214). Therefore, the laboratory site has great limitations on the size of the core sample for dielectric property measurement.

[0004] In view of this, this paper aims to provide a dielectric property measurement device suitable for large-sized and long cores in the laboratory. Summary of the invention

[0005] In view of the above problems in the prior art, the purpose of this article is to provide a core dielectric property measurement device to solve the problem in the prior art that the size of the core sample for dielectric property measurement in the laboratory and other scenarios is greatly limited.

[0006] In order to solve the above technical problems, the specific technical solutions of this article are as follows:

[0007] This article provides a core dielectric property measurement device, comprising a sample moving structure, a dielectric measurement structure, a data processing structure and a controller, wherein the sample moving structure, the dielectric measurement structure and the data processing structure are all connected to the controller;

[0008] The sample moving structure is used to carry the core sample to be measured and drive the core sample to move relative to the dielectric measurement structure under the control of the controller;

[0009] The dielectric measurement structure is used to obtain dielectric property parameters of the core sample under the control of the controller;

[0010] The data processing structure is connected to the dielectric measurement structure and is used for processing the data acquired by the dielectric measurement structure under the control of the controller.

[0011] Specifically, the sample moving structure includes a tray, a slideway and a motor;

[0012] The tray is arranged on the slideway for placing the core sample; the tray is also provided with a first baffle and a second baffle, the first baffle and the second baffle are respectively arranged at two ends of the core sample, and are used to prevent the core sample from moving relative to the tray along the direction of the axis;

[0013] The motor is connected to the controller and is used for driving the tray to move relative to the slideway under the control of the controller.

[0014] Specifically, the slide includes a recess and convex portions symmetrically arranged on both sides of the recess, the tray is placed above the recess and in line contact with the convex portions, and the convex portions and the recess are used to limit the movement of the tray perpendicular to the axis of the slide.

[0015] Preferably, the tray is arranged in an arc shape to limit the movement of the core sample in a direction perpendicular to the axis of the slideway.

[0016] Specifically, the motor includes a motor housing and an output shaft, and one end of the output shaft away from the motor housing is a screw rod; the tray is also connected to a transmission conversion nut;

[0017] The motor is connected to the tray via the lead screw and the transmission conversion nut, and the lead screw and the transmission conversion nut are used to convert the rotational motion of the output shaft into a linear reciprocating motion of the tray relative to the slideway.

[0018] Specifically, the dielectric measurement structure includes a protective shell and a dielectric contact plate;

[0019] The protective shell is used to accommodate the dielectric contact plate;

[0020] A plurality of signal transmitting units and a plurality of signal receiving units are arranged on the side of the dielectric contact plate facing the core sample; the signal transmitting unit is connected to the controller and is used to transmit measurement signals under the control of the controller; the signal receiving unit is connected to the signal transmitting unit and the data processing structure and is used to feed back response signals corresponding to the measurement signals to the data processing structure.

[0021] Further, the dielectric contact plate includes a first plate and a second plate symmetrically arranged on both sides of the first plate, and the first plate and the second plate are parallel to the moving direction of the core sample;

[0022] The second electrode plate is connected to the controller, and the controller is used to adjust the angle between the second electrode plate and the first electrode plate to clamp the core sample.

[0023] Furthermore, the signal transmitting unit and the signal receiving unit are both arranged on the first electrode plate, and two signal transmitting units are arranged; at least two signal receiving units are arranged and are located between the two signal transmitting units, and the distance between two adjacent signal receiving units is equal.

[0024] Preferably, a temperature sensor is also provided on the side of the dielectric contact plate facing the core sample.

[0025] Preferably, a telescopic bracket is provided between the protective shell and the dielectric contact plate.

[0026] By adopting the above technical scheme, a core dielectric property measurement device described in this article enables the dielectric measurement structure to be fixed during the dielectric property measurement of the core sample, while the core sample moves relative to the dielectric measurement structure, so as to realize dielectric measurement of different positions of the core sample, providing a new idea for measuring the core sample; since the core sample is moved while the position of the dielectric measurement structure is fixed, the dielectric measurement structure can be designed to have a smaller size, which is conducive to reducing the development and production costs of the measurement device; and there is no need to polish the core surface, which reduces the workload of the preliminary preparation for the dielectric property measurement, and is suitable for dielectric measurement of larger-sized core samples in laboratory and other field environments.

[0027] In order to make the above and other purposes, features and advantages of this article more obvious and easy to understand, the following specifically cites preferred embodiments and describes them in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of this article or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of this article. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic structural diagram of a core dielectric property measurement device provided in an embodiment of the present invention is shown;

[0030] Figure 2The schematic diagram of the structure when the dielectric property measurement of the core sample reaches the end is shown;

[0031] Figure 3 yes Figure 1 Side view of

[0032] Figure 4 A control logic schematic diagram of a core dielectric property measurement device provided in an embodiment of this invention is shown;

[0033] Figure 5 A partial structural schematic diagram of the sample moving structure in the embodiment of this article is shown;

[0034] Figure 6 A schematic diagram of the structure of the slideway described in the embodiment of this article is shown;

[0035] Figure 7 A schematic diagram of the structure of the dielectric measurement structure described in the embodiments of this article is shown;

[0036] Figure 8 A schematic diagram of the structure of the dielectric contact plate described in the embodiments of this invention is shown;

[0037] Fig. 9 A schematic diagram showing the working principles of the signal transmitting unit and the signal receiving unit in the embodiment of this invention is shown;

[0038] Fig.10 A schematic diagram of the flow of data processing and inversion based on the core dielectric property measurement device provided in the embodiment of this article is shown.

[0039] Description of the accompanying symbols:

[0040] 10. Sample moving structure;

[0041] 11. Pallet;

[0042] 111. Pallet unit;

[0043] 12. Slideway;

[0044] 121. Concave;

[0045] 122. Convex part;

[0046] 13. Motor;

[0047] 14. First baffle;

[0048] 15. Second baffle;

[0049] 20. Dielectric measurement structure;

[0050] 21. Protective shell;

[0051] 211. handle;

[0052] 22. Dielectric contact plate;

[0053] 221, first plate;

[0054] 222, second plate;

[0055] 23. Signal transmitting unit;

[0056] 231, transmitting antenna;

[0057] 24. Signal receiving unit;

[0058] 241. Receiving antenna;

[0059] 25. Temperature sensor;

[0060] 26. Telescopic bracket;

[0061] 30. Data processing structure;

[0062] 40. Controller;

[0063] 50. Core samples. DETAILED DESCRIPTION

[0064] The following will be combined with the drawings in the embodiments of this article to clearly and completely describe the technical solutions in the embodiments of this article. Obviously, the described embodiments are only part of the embodiments of this article, not all of the embodiments. Based on the embodiments of this article, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this article.

[0065] It should be noted that the terms "first", "second", etc. in the specification and claims of this article and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of this article described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, device, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0066] The parallel plate method and coaxial probe method used in existing laboratories are only applicable to the measurement of dielectric properties of small-sized core samples, and have great limitations on the measurement of large-sized core samples.

[0067] In order to solve the above problems, the embodiments of this document provide a core dielectric property measurement device, which can be applied to dielectric property measurement scenarios of large-sized core samples. Figure 1 is a schematic diagram of the structure of a core dielectric property measurement device provided in an embodiment of this invention. Figure 3 yes Figure 1 Side view of Figure 4 Schematic diagram of control logic of the core dielectric property measurement device. Figure 1 , Figure 3 and Figure 4 As shown, the measuring device may include a sample moving structure 10, a dielectric measurement structure 20, a data processing structure 30 and a controller 40, and the sample moving structure 10, the dielectric measurement structure 20 and the data processing structure 30 are all electrically connected to the controller 40; in the embodiment of this specification, the electrical connection can be a wired electrical connection realized by a control line or a data line, etc., or it can be a wireless communication connection established between the two parties through wireless communication technology.

[0068] The sample moving structure 10 is used to carry the core sample 50 to be measured and drive the core sample 50 to move relative to the dielectric measurement structure 20 under the control of the controller 40 (eg, Figure 1 As shown, the core sample 50 can be driven to move in the direction indicated by the arrow);

[0069] The dielectric measurement structure 20 is used to obtain dielectric property parameters of the core sample 50 under the control of the controller 40;

[0070] The data processing structure 30 is electrically connected to the dielectric measurement structure 20 , and the data processing structure 30 is used to process the data acquired by the dielectric measurement structure 20 under the control of the controller 40 .

[0071] In the embodiments of this specification, the controller 40 can be a single-chip microcomputer, a microprocessor (MCU), a digital signal processor (DSP), etc., or it can be control software integrated on an intelligent terminal, such as control software, etc.; the intelligent terminal can be a personal computer, a tablet computer, a vehicle-mounted human-computer interaction device, a smart phone, a wearable device, or a combination of any of these devices.

[0072] The core dielectric property measurement device provided in the embodiment of this specification creatively changes the relative movement relationship between the core sample and the measurement tool during the dielectric property measurement of the core sample, so that the measurement tools such as the dielectric measurement structure are fixed, while the core sample moves to measure different positions of the core sample, providing a new idea and method for measuring the core sample. In addition, since the core sample moves while the dielectric measurement structure is fixed, the dielectric measurement structure can be designed to have a smaller size; and, before the dielectric measurement, there is no need to strictly polish the core surface, which reduces the workload of the preliminary preparation work for the dielectric property measurement, and is suitable for dielectric measurement of larger core samples in laboratory and other field environments.

[0073] like Figures 1 to 8 As shown, the sample moving structure 10 includes a tray 11, a slide 12 and a motor 13;

[0074] The tray 11 is disposed on the slide 12, and the tray 11 is used to place the core sample 50; the tray 11 is also provided with a first baffle 14 and a second baffle 15, and the first baffle 14 and the second baffle 15 are respectively disposed at two ends of the core sample 50, and are used to prevent the core sample 50 from moving relative to the tray 11 along the direction of the axis;

[0075] The motor 13 is connected to the controller 40 and is used to drive the tray 11 to move relative to the slideway 12 under the control of the controller 40. That is, the motor 13 drives the tray 11 and the core sample 50 carried on the tray 11 to move on the slideway 12 together.

[0076] In some feasible embodiments, the first baffle 14 can be fixed at one end of the tray 11 (for example, at the right end of the tray 11 as shown in FIG. 1 ), and the second baffle 15 can be detachably connected to the tray 11 to adjust its position on the tray 11 according to the length of the core sample 50, for example, detachably connected to the tray 11 by means of a slot, a connection claw, etc. Of course, both the first baffle 14 and the second baffle 15 can be detachably connected to the tray 11.

[0077] Since the core sample 50 may have different lengths (in the embodiments of this specification, the "length" direction of the core sample refers to the direction along the axis of the core sample 50, and the "length" direction of other components refers to the direction parallel to the axis of the core sample). When the tray 11 is of a fixed length, for some core samples 50 whose length is greater than the length of the tray 11, it may happen that part of the core sample 50 does not fall on the tray 11 but is suspended in the air. The core sample 50 has a certain dead weight. If the suspended part is long, it may cause the core sample 50 to tip over in serious cases, and the dielectric measurement structure 20 may not be kept in close contact with the core sample during measurement, resulting in inaccurate or even invalid measured data. For some core samples 50 whose length is much smaller than the length of the tray 11, the carrying space of the tray 11 is wasted.

[0078] Therefore, in some feasible embodiments, the tray 11 can be assembled from multiple tray units, such as Figure 5 As shown, each tray unit 111 may have the same size, for example, the length is 1 meter, then according to the actual length of the core sample 50, an appropriate number of the tray units 111 may be assembled to obtain a tray 11 of appropriate length (i.e., equal to or slightly greater than the length of the core sample), so that the overall space occupancy rate of the core dielectric property measurement device can be optimized. Moreover, after the dielectric property measurement of the core sample 50 is completed, the tray 11 can be disassembled into multiple tray units 111, so as to facilitate the storage of the measurement device.

[0079] It should be noted that, in the embodiments of this specification, there is no specific restriction on the curvature of the inner side surface of the tray 11 (i.e., the surface where the tray 11 contacts the core sample 50) and the curvature of the outer side surface (i.e., the surface where the tray 11 contacts the slide 12), and the curvatures of the two may be the same or different; and there is no specific restriction on whether the inner side surface and the outer side surface of the tray 11 are concentric circles, and the two may be concentrically arranged or not; the specific dimensional parameters of the inner side surface and the outer side surface of the tray 11 may be set according to actual measurement needs.

[0080] Similarly, the slide 12 can also be assembled from a plurality of slide units (not shown in the figure), and a suitable number of slide units can be assembled according to actual measurement requirements so that the length of the slide 12 is adapted to the actual length of the core sample 50. That is, the embodiment of the specification provides a core dielectric property measurement device, in which the slide 12 and the tray 11 can be assembled from basic units, which is conducive to reducing the device cost and saving the measurement site space, and is convenient for the storage and custody of the measurement device.

[0081] like Figure 6As shown, the slide 12 includes a recess 121 and convex portions 122 symmetrically arranged on both sides of the recess 121, and the tray 11 is placed above the recess 121 and is in line contact with the convex portion 122; the convex portion 122 and the recess 121 are used to limit the movement of the tray 11 perpendicular to the axis direction of the slide 12; that is, the recess 121 and the convex portion 122 are used to ensure that the tray 11 always moves along the direction of the axis of the slide 12, thereby ensuring the measurement direction of the core sample 50 during the dielectric property measurement and ensuring the accuracy of the dielectric property parameter measurement.

[0082] Preferably, the concave portion 121 and the convex portion 122 can be integrally formed to improve the bearing capacity of the core sample 50. The bottom surface of the tray 11 forms a line contact (specifically, a line-surface contact) with the edge of the convex portion 122 close to the concave portion 121, thereby reducing the resistance of the tray 11 when moving on the slide 12 and improving the driving force conversion efficiency of the motor 13.

[0083] like Figure 5 As shown, the tray 11 is arranged in an arc shape and contacts the surface of the core sample 50. The cross section of the tray 11 perpendicular to its length direction is an inverted arch, so as to limit the movement of the core sample 50 perpendicular to the axis direction of the slide 12; that is, to ensure the stability of the core sample 50 when it is carried inside, so as to improve the accuracy of dielectric property measurement, and facilitate the subsequent inversion of reservoir water porosity, formation water mineralization, porous medium structure and other properties.

[0084] In some feasible embodiments, the tray 11 may have the same curvature as the core sample 50 to achieve a better limiting effect on the core sample 50 .

[0085] However, since the core samples 50 may have cross-sectional sizes of different shapes, the core samples 50 with circular cross-sections may also have different radius sizes. In order to restrict the rolling of the core samples 50 with circular cross-sections of different radii, multiple trays with different curvatures need to be provided, which will make the device costly.

[0086] Therefore, in some feasible embodiments, the tray 11 may include a first tray and a second tray (not shown in the figure) arranged on both sides of the first tray, and the first tray and the second tray are both consistent with the length direction of the slide 12; the first tray is arranged in an arc shape to make line contact with the protrusion 122 to reduce the resistance of the tray 11 sliding on the slide 12; the angle between the second tray and the first tray is variable to clamp the core sample 50.

[0087] Specifically, the first support plate and the second support plate can be connected by a hinge with a damping structure, and when the core sample 50 is placed on the tray 11, it will abut against the second support plate and make the second support plate open outward, so that the second support plate will apply a reaction force on the core sample 50 to clamp the core sample 50. Of course, the first support plate and the second support plate can also be connected in other ways, and the angle between the two can also be adjusted in other ways, such as an electric control method, etc.

[0088] It should be noted that the above-mentioned tray 11 includes a first support plate and two second support plates, which is only one feasible case. In fact, the tray 11 may include other number of support plates, for example, a third support plate may be provided on the side of each of the two second support plates away from the first support plate. In addition, in the case where the tray 11 is assembled from a plurality of tray units 111, and each tray unit 111 has a first support plate and a second support plate, it is necessary to ensure that the angle between the first support plate and the second support plate of each tray unit 111 is the same to ensure the clamping effect on the core sample 50.

[0089] The motor 13 includes a motor housing and an output shaft, and the end of the output shaft away from the motor housing is a screw rod; the tray is also connected to a transmission conversion nut; the transmission conversion nut can be set at the bottom of the tray 11, or can be built into the first support plate.

[0090] The motor 13 is connected to the tray 11 via the screw rod and the transmission conversion nut, and the screw rod and the transmission conversion nut are used to convert the rotational motion of the output shaft into a linear reciprocating motion of the tray 11 relative to the slideway 12 .

[0091] It should be noted that the motor 13 can also drive the tray 11 to move in other ways. For example, the motor 13 is arranged beside the slideway 12 and is consistent with the axial direction of the slideway 12. The motor 13 is connected to the tray 11 through a steel wire. The rotation of the motor 13 causes the steel wire to be wound, thereby shortening the distance between the tray 11 and the motor, and driving the tray 11 and the core sample 50 thereon to move in a direction close to the motor 13. When the height of the motor 13 is not on the same horizontal plane as the height of the tray 11, the steel wire can also change its transmission direction via a pulley.

[0092] In the embodiment of the present specification, the screw rod and the transmission conversion nut cooperate to control the output shaft of the motor 13 to rotate forward or reverse, so that the tray 11 can move back and forth in a straight line on the slide 12. For example, when the on-site surveyor has doubts about the measurement data of the core sample at the 3rd meter, and the core sample 50 has been measured from the initial position (0 meters) to 4 meters, the technician can control the motor 13 to rotate in the opposite direction through the controller 40, so that the motor 13 drives the tray 11 and the core sample 50 thereon to retreat 1 meter to the 3-meter position, so as to achieve re-measurement at 3 meters, and the control is more convenient.

[0093] like Figure 3 and Figure 7 As shown, the dielectric measurement structure 20 includes a protective shell 21 and a dielectric contact plate 22;

[0094] The protective shell 21 is used to accommodate the dielectric contact plate 22; the protective shell 21 is also provided with a handle 211;

[0095] A plurality of signal transmitting units 23 and a plurality of signal receiving units 24 are arranged on a side of the dielectric contact plate 22 facing the core sample 50;

[0096] The signal transmitting unit 23 is connected to the controller 40, and is used to transmit a measurement signal under the control of the controller 40; the signal receiving unit 24 is connected to the signal transmitting unit 23 and the data processing structure 30, and is used to feed back a response signal corresponding to the measurement signal to the data processing structure 30.

[0097] When the core dielectric property measurement device is not in use, the dielectric contact plate 22 can be stored in the protective shell 21 to avoid damage caused by collision, friction, etc. between the dielectric contact plate 22 and other obstacles, which is beneficial to improving the service life of the dielectric contact plate 22.

[0098] Specifically, the protective shell 21 and the dielectric contact plate 22 are connected by a telescopic bracket 26 (such as Figures 1 to 3 As shown), the telescopic bracket 26 is connected to the controller 40 to be telescopic under the control of the controller 40 to adjust the distance between the dielectric contact plate 22 and the protective shell 21.

[0099] Specifically, when the core sample 50 is placed for dielectric property measurement, the controller 40 drives the telescopic bracket 26 to extend so that the dielectric contact plate 22 extends in a direction away from the protective shell 21, and until the signal transmitting unit 23 and the signal receiving unit arranged at the protective shell 21 are in close contact with the surface of the core sample 50 for measurement; and when the measurement is completed, the telescopic bracket 26 retracts under the control of the controller 40 so that the dielectric contact plate 22 is stored in the protective shell 21. The end of the telescopic bracket 26 connected to the protective shell 21 is rotatable, that is, the telescopic bracket 26 can rotate around the end connected to the protective shell 21. When the telescopic bracket 26 drives the dielectric contact plate 22 to be stored in the protective shell 21, the telescopic bracket 26 transitions from an extended state and a state perpendicular to the protective shell 21 to a contracted state and a state parallel to the protective shell 21. It can be understood that the telescopic bracket 26 and the dielectric contact plate 22 are also rotatably arranged, so that when the dielectric contact plate 22 is stored in the protective shell 21, the telescopic bracket 26 is between the dielectric contact plate 22 and the protective shell 21, and is parallel to the dielectric contact plate 22 and the protective shell 21. Preferably, the protective shell 21 may also be provided with a groove for accommodating the telescopic bracket 26, so as to improve the stability of the whole formed by the protective shell 21, the dielectric contact plate 22 and the telescopic bracket 26 when stored.

[0100] In some possible embodiments, such as Figure 8 As shown, the dielectric contact plate 22 includes a first plate 221 and a second plate 222 symmetrically arranged on both sides of the first plate 221, and the first plate 221 and the second plate 222 are both parallel to the moving direction of the core sample 50; that is, the first plate 221 and the second plate 222 are both consistent with the length of the slide 12.

[0101] The second electrode plate 222 is connected to the controller 40 , and the controller 40 is used to adjust the angle between the second electrode plate 222 and the first electrode plate 221 to clamp the core sample.

[0102] Specifically, a driving element (such as an air pump, etc.) connected to the controller 40 may be provided at the connection between the second electrode plate 222 and the first electrode plate 221, so that the controller can drive the bending direction of the second electrode plate 222 through the driving element to adjust the size of the angle between the second electrode plate 222 and the first electrode plate 221, thereby clamping the core sample 50 and ensuring that the first electrode plate 221 and the signal transmitting unit 23 and the signal receiving unit 24 located on the first electrode plate 221 are closely attached to the core sample 50. Of course, other connection methods can be used between the first electrode plate 221 and the second electrode plate 222, and other adjustment methods can be used for the angle between the two, for example, connecting through a hinge with a damping structure, etc.

[0103] In the embodiment of this specification, optionally, the signal transmitting unit 23 and the signal receiving unit 24 are both arranged on the first pole plate 221, so that when the controller 40 adjusts the angle between the first pole plate 221 and the second pole plate 222, the signal transmitting unit 23 and the signal receiving unit 24 will not be affected.

[0104] In some possible embodiments, such as Figure 7 As shown, two signal transmitting units 23 are provided; at least two signal receiving units 24 are provided and are located between the two signal transmitting units 23, the distance between two adjacent signal receiving units 24 is equal, and the distance between two signal transmitting units 23 and the nearest signal receiving unit 24 is also equal.

[0105] Furthermore, a temperature sensor 25 and / or a humidity sensor is also provided on the side of the dielectric contact plate facing the core sample.

[0106] like Fig. 9 As shown in FIG. 1 , it is a schematic diagram of the working principle of the signal transmitting unit 23 and the signal receiving unit 24 located in the dielectric contact plate. Fig. 9 As shown, two signal transmitting units 23 are provided and are respectively marked as 1A and 2A, and five signal receiving units 24 are provided and are respectively marked as 1B, 2B, 3B, 4B and 5B, and a data processing structure 30 is also included. The above signal transmitting units 23, signal receiving units 24 and data processing structure 30 are all connected to the controller 40. The distance between two adjacent signal receiving units is set to 2.5 cm, and the distance between a signal transmitting unit and a signal receiving unit closest to it is set to 7.5 cm. The above distance settings are only exemplary, and the tester can adjust and set the distance between the signal transmitting unit and the signal receiving unit, and between the two signal receiving units according to the actual measurement needs of the dielectric properties of the core sample.

[0107] It should be noted that, in the embodiment of this specification, the signal transmitting unit 23 and the signal receiving unit 24 are further provided with a transmitting antenna 231 and a receiving antenna 241 respectively, for transmitting and receiving electromagnetic wave signals.

[0108] Specifically, after the signal transmitting unit 1A is triggered by the controller 40, the five signal receiving units will respond to the triggering and provide attenuation and phase shift, thereby generating five independent measurement values ​​(each measurement value includes an attenuation measurement value and a phase measurement value, and the five groups have a total of ten measurement values). The five signal receiving units respond to the triggering of the signal transmitting unit 2A and obtain five groups (ten) of measurement values ​​again. Optionally, these ten measurement values ​​(response to the signal transmitting unit 2A) are combined with the previous ten measurement values ​​(response to the signal transmitting unit 1A) to provide compensation measurement, that is, to compensate for changes in the electronic equipment, thereby improving the accuracy of obtaining the dielectric property parameters of any measurement point of the core sample.

[0109] The signal receiving units 1B to 5B send the measurement values ​​to the data processing structure 30, where the measurement values ​​are analog signals. The data processing structure 30 can convert the analog signals into digital signals, process and analyze the digital signals to extract the measurement information, and monitor and store the extracted measurement information in real time.

[0110] The signal transmitting unit can have four operating frequencies: 20MHz, 100MHz, 350MHz and 1000MHz. The signal pulse is 10 microseconds. Corresponding to each transmission frequency, each signal receiving unit will receive the attenuation and phase shift relative to the signal transmitting unit, that is, the absolute attenuation and phase shift. After obtaining the absolute attenuation and relative shift, the difference between the attenuation and relative shift for different signal receiving units can be calculated. Therefore, for this measuring device, there are two signal transmitting units and five signal receiving units, and for each frequency, ten sets of absolute measurement values ​​and twenty sets of difference values ​​will be generated. The ten sets of absolute values ​​are 1A1B, 1A2B, 1A3B, 1A4B, 1A5B, 2A1B, 2A2B, 2A3B, 2A4B, 2A5B. The twenty sets of difference values ​​are 1A1B-1A2B, 1A1B-1A3B, 1A1B-1A4B, 1A1B-1A5B, 1A2B-1A3B, 1A2B-1A4B, 1A2B-1A5B, 1A3B-1A4B, 1A3B-1A5B, 2A1B-1A2B, 2A1B-1A3B, 2A1B-1A4B, 2A1B-1A5B, 2A2B-1A3B, 2A2B-1A4B, 2A2B-1A5B, 2A3B-1A4B, 2A3B-1A5B, thereby achieving accurate measurement of the dielectric properties of the core samples.

[0111] like Fig.10, which is a flow chart of data processing and inversion. The attenuation data and phase shift data obtained by the data processing structure 30 can be used to obtain the conductivity and dielectric constant of the dielectric execution parameters of the core sample by considering the influence of temperature (obtained by the temperature sensor 25) through the system model; the conductivity and dielectric constant can be interpreted as the water porosity, formation water mineralization and porous medium structural parameters of the core sample through the inversion model.

[0112] In order to more clearly illustrate the core dielectric property measurement device provided in the embodiments of this specification, its use will be briefly introduced below.

[0113] (1) Preparation before testing:

[0114] The long core sample 50 is placed flat on the annular tray 11. Figure 1 As shown, the tray 11 is located on the right side of the slide 12; the first baffle 14 and the second baffle 15 are respectively erected at the two ends of the core sample 50 so that the core sample 50 is fixed to the tray 11 to prevent it from sliding axially relative to the tray 11 during the test. At the same time, the dielectric measurement structure 20 is located above the right side of the core sample 50, and the telescopic bracket 26 is driven to extend to make the dielectric contact plate 22 close to the core sample (the rightmost end). At this time, the head end (right side) of the core sample 50, the head end (right side) of the tray 11 and the head end (right side) of the dielectric contact plate 22 are located on the same vertical plane; the dielectric contact plate 22 (including its first plate and second plate) and the annular tray 11 cooperate to clamp the core sample 50 to prevent it from rolling perpendicular to the axis direction of the tray 11 during the test.

[0115] (2) During testing:

[0116] During the test, the protective shell 21 can be connected to the fixed wall through the connecting rod to ensure that the dielectric measurement structure 20 is in a stationary state. The controller 40 controls the motor 13 to start, and the output shaft of the motor is connected to the tray 11 through the transmission conversion nut, so that the tray 11 moves to the right along the slide 12 at a uniform speed. The moving speed can be 5 cm / s until the end (left side) of the core sample 50 is flush with the end (left side) of the dielectric contact plate 22, that is, Figure 2 As shown, the dielectric property measurement of the core sample 50 along its length direction is completed.

[0117] It should be noted that the movement speed of the tray 11 and the core sample 50 disposed on the tray 11 can be adjusted by adjusting the output power of the motor 13 .

[0118] The controller 40 controls the signal transmitting unit 23 and the signal receiving unit 24 to start, and the width of the pulse signal transmitted by the signal transmitting unit 23 can be 10 microseconds, and the transmission frequency can be 20MHz, 100MHz, 350MHz and 1000MHz, etc. Then, corresponding to each transmission frequency, each signal receiving unit 24 receives the attenuation data and phase shift data corresponding to the two signal transmitting units, and thus can generate the ten groups of absolute measurement values ​​and twenty groups of difference values ​​mentioned above.

[0119] (3) Test completed:

[0120] The signal receiving unit 24 sends the above data to the data processing structure 30, which converts the analog signal into a digital signal and then converts the digital signal into conductivity and dielectric constant; through the inversion model, the conductivity and dielectric constant obtained at four frequencies are interpreted as the water porosity, formation water mineralization and porous medium structure parameters of the core sample.

[0121] It should also be understood that in the embodiments of this article, the term "and / or" is only a description of the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0122] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this article.

[0123] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0124] In the several embodiments provided herein, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, or can be electrical, mechanical or other forms of connection.

[0125] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of this article.

[0126] In addition, each functional unit in each embodiment of this invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional unit.

[0127] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this article is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of this article. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0128] Specific embodiments are used in this article to illustrate the principles and implementation methods of this article. The description of the above embodiments is only used to help understand the methods and core ideas of this article. At the same time, for general technicians in this field, according to the ideas of this article, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on this article.

Claims

1. A core dielectric property measurement device, characterized in that: It includes a sample moving structure, a dielectric measurement structure, a data processing structure and a controller, wherein the sample moving structure, the dielectric measurement structure and the data processing structure are all connected to the controller; The sample moving structure is used to carry the core sample to be measured and drive the core sample to move relative to the dielectric measurement structure under the control of the controller, and the sample moving structure includes a tray, a slide and a motor; The tray is arranged on the slideway for placing the core sample; the tray is also provided with a first baffle and a second baffle, the first baffle and the second baffle are respectively arranged at two ends of the core sample, and are used to prevent the core sample from moving relative to the tray along the direction of the axis; The motor is connected to the controller and is used to drive the tray to move relative to the slideway under the control of the controller; The dielectric measurement structure is used to obtain dielectric property parameters of the core sample under the control of the controller; The data processing structure is connected to the dielectric measurement structure and is used for processing the data acquired by the dielectric measurement structure under the control of the controller.

2. The measuring device according to claim 1, characterized in that The slide includes a recessed portion and convex portions symmetrically arranged on both sides of the recessed portion. The tray is placed above the recessed portion and is in line contact with the convex portions. The convex portions and the recessed portions are used to limit the movement of the tray in a direction perpendicular to the axis of the slide.

3. The measuring device according to claim 1, characterized in that The tray is arranged in an arc shape to limit the movement of the core sample in a direction perpendicular to the axis of the slideway.

4. The measuring device according to claim 1, characterized in that The motor comprises a motor housing and an output shaft, and one end of the output shaft away from the motor housing is a screw rod; the tray is also connected to a transmission conversion nut; The motor is connected to the tray via the lead screw and the transmission conversion nut, and the lead screw and the transmission conversion nut are used to convert the rotational motion of the output shaft into a linear reciprocating motion of the tray relative to the slideway.

5. The measuring device according to claim 1, characterized in that The dielectric measurement structure includes a protective shell and a dielectric contact plate; The protective shell is used to accommodate the dielectric contact plate; A plurality of signal transmitting units and a plurality of signal receiving units are arranged on the side of the dielectric contact plate facing the core sample; the signal transmitting unit is connected to the controller and is used to transmit measurement signals under the control of the controller; the signal receiving unit is connected to the signal transmitting unit and the data processing structure and is used to feed back response signals corresponding to the measurement signals to the data processing structure.

6. The measuring device according to claim 5, characterized in that The dielectric contact plate comprises a first plate and a second plate symmetrically arranged on both sides of the first plate, wherein the first plate and the second plate are parallel to the moving direction of the core sample; The second electrode plate is connected to the controller, and the controller is used to adjust the angle between the second electrode plate and the first electrode plate to clamp the core sample.

7. The measuring device according to claim 6, characterized in that The signal transmitting unit and the signal receiving unit are both arranged on the first electrode plate, and two signal transmitting units are arranged; at least two signal receiving units are arranged and are located between the two signal transmitting units, and the distance between two adjacent signal receiving units is equal.

8. The measuring device according to claim 5, characterized in that A temperature sensor is also arranged on the side of the dielectric contact plate facing the core sample.

9. The measuring device according to claim 5, characterized in that A telescopic bracket is arranged between the protective shell and the dielectric contact plate.

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