Core electrical radial array measuring device

Abstract

The utility model discloses a kind of core electrical radial array measuring devices, including base and the sheath being set on base, to be measured core is placed in sheath, the screw-in electrode of sheath two sides is from the clamping core of core two sides shaft end face, the screw-in electrode of sheath two sides is coaxial with sheath and is arranged on base oppositely, and between sheath and base setting threaded transmission structure, sheath is equipped with several floating electrode, floating electrode is contacted with the core outer circumferential side surface in sheath along the radial of sheath, screw-in electrode and floating electrode are electrically connected with detection equipment and carry out electrical measurement to core, screw-in electrode and floating electrode respectively realize the electrical detection access of core two sides shaft end face position and outer circumferential side surface position, realize core space multipoint electrical detection.The utility model compact structure, core detection clamping structure is simple, can realize core space multipoint electrical measurement, measurement structure is stable and reliable, can be used for indoor experiment platform, also suitable for field portable measurement task.

Description

Technical Field

[0001] This utility model discloses a core electrical radial array measurement device, which belongs to the core testing auxiliary tooling in the field of geophysical exploration. Background Technology

[0002] As the direct carrier of subsurface geological information, the accurate measurement of the physical properties of rock cores plays a fundamental role in reservoir evaluation, fluid identification, and geological modeling. Traditional core resistivity measurement methods typically employ simple two-electrode or four-electrode structures. The core is clamped and fixed using a clamping structure, and electrodes are placed at both ends of the core to connect it to a detection circuit for electrical property measurement. However, this method suffers from problems such as unstable clamping, inconsistent electrode contact, and inability to adapt to samples of different sizes. It is particularly inadequate for multi-point measurements and spatial distribution detection, affecting the accuracy and representativeness of the data.

[0003] For example, Chinese patent application CN202123066386.0 discloses a core clamping device for core monitoring. The device uses a shell assembly to wrap and fix the core, and then uses a fixed end assembly to position the core sample between two plates of an electrode assembly. The device has a complex structure, poor versatility, or high cost, and is not suitable for rapid measurement of diverse geological samples and large-scale experimental needs. It also cannot achieve multi-point electrical measurement of the core in other directions. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a radial array measurement device for core electrical properties, addressing the issues of complex core clamping structures and fixed measurement directions in existing core electrical property measurement devices.

[0005] This utility model is achieved using the following technical solution: A core electrical radial array measurement device includes a base 100 and a sheath disposed on the base 100. The core to be measured is placed inside the sheath. The sheath has screw-in electrodes 120 on both sides that clamp the core from the axial end faces of the core. The screw-in electrodes 120 on both sides of the sheath are coaxial with the sheath and arranged facing each other on the base 100, and a threaded transmission structure is provided between them and the base 100. The sheath has several floating electrodes 140. The floating electrodes 140 press against the outer peripheral side of the core inside the sheath along the radial direction of the sheath. The screw-in electrodes 120 and the floating electrodes 140 are electrically connected to the detection equipment to perform electrical measurements on the core. The screw-in electrodes and the floating electrodes realize the electrical detection access at the axial end faces and the outer peripheral side positions of the core, respectively, realizing multi-point electrical detection in the core space.

[0006] In the core electrical radial array measuring device of this utility model, the sheath further includes a lower cover 130 and an upper cover 131 that are split in half along the plane of the sheath axis. The lower cover 130 is supported and fixed on the base 100. The upper cover 131 and the lower cover 130 are assembled into a cylindrical shell of the sheath by a detachable connector. The detachable sheath facilitates the clamping operation of the core inside the sheath.

[0007] In the core electrical radial array measuring device of this utility model, the sheath is a cylindrical shell that matches the cross-section of the core. The sheath is clamped and fixed to the two axial end faces of the core by the screw-in electrode 120. Therefore, the sheath does not need to limit and fix the core. Thus, the inner diameter of the sheath can be set to be larger than the outer diameter of the core. The elastic extension and contraction of the floating electrode is used to achieve the pressing contact with the outer peripheral side of the core.

[0008] In the core electrical radial array measuring device of this utility model, the screw-in electrode 120 further includes a copper electrode 121, a core positioning groove plate 123, and a threaded post 124. The core positioning groove plate 123 is provided with positioning grooves for embedding the axial end faces of both sides of the core. The copper electrode 121 is embedded in the positioning groove of the core positioning groove plate and electrically connected to the core end face embedded in the positioning groove. The threaded post 124 is vertically disposed on the back of the core positioning groove plate and rotatably connected to the core positioning groove plate 123. Its axis coincides with the center of the positioning groove on the core positioning groove plate. The screw-in electrode 120 is threadedly connected to the support frame 101 on the base 100 through the threaded post 124. The screw-in electrode also serves as a core clamping mechanism and an electrical access electrode for the axial end faces of both sides.

[0009] In the core electrical radial array measuring device of this utility model, a knob 125 is further fixed on the threaded column 124 to facilitate the rotation of the threaded column.

[0010] In the core electrical radial array measuring device of this utility model, the copper electrode 121 is made of copper sheet that matches the positioning groove, and a first terminal 122 extending from the back of the core positioning groove plate is provided on it, which makes it more convenient to connect the wires from the back of the core positioning groove plate.

[0011] In the core electrical radial array measuring device of this utility model, a conductive sponge soaked in conductive liquid is provided between the copper electrode 121 and the core end face, and a guide pipe 127 for squeezing out conductive liquid and discharging it from the positioning groove is provided at the bottom of the core positioning groove plate 123, so as to facilitate the rapid removal of conductive liquid accumulated in the positioning groove.

[0012] In the core electrical radial array measuring device of this utility model, a collection groove 150 for collecting the extruded conductive liquid is provided on the base below the spiral electrode 120 to prevent the conductive liquid extruded by the spiral electrode from flowing onto the base and avoiding dirt and corrosion to the device.

[0013] In the core electrical radial array measuring device of this utility model, the floating electrode 140 further includes a fixed pin sleeve 141, a contact electrode 143, and an internal spring 145. The contact electrode 143 is inserted into the fixed pin sleeve 141. The fixed pin sleeve 141 is provided with an internal spring 145 that extends the contact electrode 143 outward. The opening of the fixed pin sleeve 141 is provided with a nut 144 that limits the maximum extension position of the contact electrode 143. The floating electrode is mounted on the sheath. The contact electrode is floated relative to the core through elastic expansion and contraction. Effective pressing contact can be achieved for the outer peripheral surfaces of cores with different outer diameters or uneven surfaces.

[0014] In the core electrical radial array measuring device of this utility model, the sheath is further provided with a plurality of electrode holes 104, the fixing pin sleeve 141 of the floating electrode 140 is inserted and fixed in the electrode hole 104, the contact electrode 143 extends toward the inside of the sheath and is pressed into contact with the outer peripheral side of the core by an internal spring 145, and the outer end of the fixing pin sleeve 141 is provided with a second terminal 142 electrically connected to the contact electrode, and all floating electrodes mounted on the sheath are conveniently connected through the second terminal on the outside.

[0015] The present invention, by adopting the above-described technical solution, has the following beneficial effects: (1) This utility model uses a screw-in electrode to clamp and fix the two axial end faces of the core, and at the same time realizes the electrical detection access of the two axial end faces of the core. Multiple sets of floating electrodes are arranged on the outer periphery of the clamped and fixed core through the sheath to perform multi-point electrical detection access on the outer periphery of the core. The floating electrodes can be flexibly arranged along the sheath to perform radial array detection of the core, thereby realizing multi-point spatial electrical detection of the core.

[0016] (2) The screw-in electrode of this utility model achieves clamping and fixing of the shaft end faces on both sides of the rock core through the threaded transmission structure. At the same time, the floating electrode on the sheath has elastic extension and contraction, which can clamp and electrically test rock cores of different lengths and outer diameters. For rock cores with uneven outer peripheral surfaces, the contact electrode of the floating electrode can automatically adjust the extension and contraction stroke according to the small undulations on the rock core surface, ensuring that the floating electrode at each point is in close contact with the rock core surface, thereby improving the consistency and repeatability of electrical measurement.

[0017] (3) The rotary electrode of this utility model uses a copper electrode and a conductive sponge soaked in conductive liquid to clamp and contact the core, ensuring that a uniform and stable electrical contact interface is formed between the core and the core, effectively reducing the contact resistance and enhancing the accuracy of the measurement data. A collection tank for conductive liquid is set on the base to collect the squeezed conductive liquid in a concentrated manner, preventing the conductive liquid from causing dirt and corrosion to the device.

[0018] (4) The screw-in electrode, sheath, floating electrode and liquid collection tank of this utility model are all installed through a detachable structure. The structure is compact and each component is modularly designed, which facilitates maintenance and expansion adjustment.

[0019] In summary, the core electrical radial array measurement device provided by this utility model has a compact structure and a simple core detection clamping structure. It can realize multi-point electrical measurement of the core space, and the measurement structure is stable and reliable. The entire structure adopts mechanical connection and modular assembly method, which takes into account both lightweight and robustness. It can be used in indoor experimental platforms and is also suitable for portable field measurement tasks.

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall core electrical radial array measurement device in an embodiment.

[0022] Figure 2 This is a schematic diagram of the base and protective sleeve in the embodiment.

[0023] Figure 3a , 3b The figures shown are an overall schematic diagram and an exploded schematic diagram of the spiral electrode in the embodiment.

[0024] Figure 4a , 4b The figures shown are an overall schematic diagram and an exploded schematic diagram of the contact electrode in the embodiment.

[0025] Figure 5 This is a schematic diagram of the collection tank in the embodiment.

[0026] The following labels are used in the diagram: 100-base, 101-support frame, 102-threaded hole, 103-buckle, 104-electrode hole, 105-hinge, 106-slot; 120-screw-in electrode, 121-copper electrode, 122-first terminal block, 123-core positioning slot plate, 124-threaded post, 125-knob, 126-locking hole, 127-guide tube, 128-cylindrical hole; 130-lower cover of sheath, 131-upper cover of sheath; 140-floating electrode, 141-fixed pin sleeve, 142-second terminal block, 143-contact electrode, 144-nut, 145-internal spring; 150-collection groove, 151-tenon. Detailed Implementation Example

[0027] See Figure 1 The radial array measurement device for core electrical properties shown in the figure is a specific embodiment of this utility model. It specifically includes a base 100, a screw-in electrode 120, a lower cover 130, an upper cover 131, a floating electrode 140, and a collection trough 150. The lower cover 130 and the upper cover 131 form a sleeve on the base 100. The sleeve is a cylindrical shell that matches the cross-section of the core. The core to be measured is placed inside the sleeve. The screw-in electrode 120 is arranged on both sides of the sleeve to clamp the core from the axial end faces on both sides of the core. The screw-in electrodes 120 on both sides of the sleeve are coaxial with the sleeve and arranged facing each other on the base 100, and a threaded transmission structure is provided between them and the base 100. Several floating electrodes 140 are provided on the sleeve. The floating electrodes 140 press against the outer peripheral side of the core inside the sleeve along the radial direction of the sleeve. The screw-in electrode 120 and the floating electrode 140 are electrically connected to the detection equipment to perform electrical measurements on the core. The base 100 serves as the mounting base for the entire device. The screw-in electrode 120 and the sheath are mounted on the base 100. The screw-in electrode 120 clamps the core from both sides of the core shaft end face, and simultaneously achieves electrical connection of the core end face through the clamping contact surface with the core shaft end face. The sheath is fitted around the core circumference and does not need to directly contact the core. It serves as the mounting base for the floating electrodes 140 distributed around the core circumference, and fully covers the outer side of the core circumference. The floating electrodes 140 achieve electrical connection to the outer side of the core circumference. The screw-in electrode 120 and the floating electrode 140 achieve electrical measurement at multiple measurement points in any direction on the outer side of the core.

[0028] This embodiment only describes the specific scheme of the core electrical radial array measuring device claimed by this utility model. The electrical measurement and detection equipment and detection circuit connection to the external screw-in electrode 120 and floating electrode 140 are all mature detection technologies in the field and are not within the protection scope of this utility model. This embodiment will not elaborate on them here.

[0029] See also Figure 2To facilitate the operation of screwing in the electrode and clamping the core inside the sheath, the sheath in this embodiment is configured as a modular structure, including a lower sheath cover 130 and an upper sheath cover 131 that are split in half along the sheath's axial plane. The lower sheath cover 130 is supported and fixed to the base 100 by a threaded connector. The upper sheath cover 131 and the lower sheath cover 130 are assembled into a cylindrical shell of the sheath by a detachable connector. By removing the upper sheath cover 131, exposing half of the sheath shell, the core can be directly inserted and clamped, and then the upper sheath cover 131 can be closed to complete the assembly of the sheath. The upper cover 131 and the lower cover 130 of the sheath are joined on one side by a hinge 105, and the other side is fastened by a snap fastener 103 that can be quickly disassembled. Considering that the core electrical property measurement does not require maintaining the annular pressure simulation on the core, the sheath in this embodiment is only used as a mounting bracket for installing the floating electrode corresponding to the outer peripheral side of the core. The sheath splicing structure with hinge and snap fastener connection can ensure the installation strength of the floating electrode.

[0030] See also Figure 3a and Figure 3b The screw-in electrode 120 includes a copper electrode 121, a core positioning groove plate 123, and a threaded post 124. The core positioning groove plate 123 is provided with positioning grooves for embedding into the shaft end faces on both sides of the core. The copper electrode 121 is embedded in the positioning groove of the core positioning groove plate and is electrically connected to the core end face embedded in the positioning groove. The threaded post 124 is vertically disposed on the back of the core positioning groove plate, and its axis coincides with the center of the positioning groove on the core positioning groove plate. The screw-in electrode 120 is threadedly connected to the support frame 101 on the base 100 through the threaded post 124.

[0031] The axis of the threaded post 124 represents the direction of the screw-in electrode. The screw-in electrodes on both sides of the sheath are arranged coaxially along the axis of their respective threaded posts, and the positioning slots of their respective core positioning plates 123 are facing each other. Two sets of parallel support frames 101 are provided on the base 100. The support frames 101 are provided with coaxial threaded holes 102. The sheath is supported on the base between the two sets of support frames 101. The screw-in electrodes 120 are respectively arranged coaxially facing each other through their respective threaded posts, and are assembled by threaded transmission through the threaded posts 124 and threaded holes 102. The threaded post 124 and the core positioning slot plate 123 are rotatably assembled. The back of the core positioning slot plate 123 is provided with a cylindrical hole 128 for installing bearings or movable sleeves, so as to realize the rotatable connection with the end of the threaded post 124. The core positioning slot plate 123 does not rotate with the threaded post 124 during the rotation process, but the axial displacement generated by the thread transmission between the threaded post 124 and the threaded hole on the support frame 101 is transmitted to the core positioning slot plate 123, so as to realize the axial displacement of the screw-in electrode 120 relative to the core, and to realize the pressing of the shaft end faces on both sides of the core. At the same time, the position of the first terminal and the guide tube on it will not change due to rotation.

[0032] The copper electrode 121 uses a copper sheet that matches the positioning groove, and a first terminal 122 extending from the back of the core positioning groove plate is provided on it. A conductive sponge soaked in conductive liquid is provided between the copper electrode 121 and the core end face to ensure a uniform and stable electrical contact interface with the core, effectively reducing contact resistance and enhancing the accuracy of measurement data. The conductive liquid soaked in the conductive sponge is squeezed out after the copper electrode of the screw-in electrode 120 and the core shaft end face are pressed together. The bottom of the core positioning groove plate 123 is provided with a guide pipe 127 for extruding the conductive liquid and leading it out of the positioning groove. The conductive liquid squeezed out of the conductive sponge flows out from the guide pipe 127 and falls into a collection groove 150 provided on the base below the screw-in electrode 120 for collection. A slot 106 is provided on the base 100, and a matching tenon 151 is provided at the bottom of the collection groove 150. The collection groove 150 is detachably fixed to the base 100 by tenon and mortise and tenon joints. Figure 1 and Figure 5 As shown, excess conductive liquid squeezed out during the measurement process flows into the collection tank 150 through the guide pipe, avoiding contamination of the core or short circuit risk, and improving the cleanliness of the device environment.

[0033] After the threaded post 124 of the screw-in electrode 120 passes through the threaded hole on the support frame 101, a knob 125 is installed on it through a locking hole 126. By rotating the threaded post through the knob 125, the threaded post 124 and the knob 125 are locked together by a detachable connector such as a pin or screw, so that the knob 125 can be removed and the threaded post 124 can be passed through the threaded hole and installed on the support frame 101. By rotating the knob 125, the threaded post and the core positioning slot plate are axially advanced, which can achieve stepless adjustment and clamping for cores of different lengths and hardnesses, improving the adaptability and stability of core samples.

[0034] See also Figure 4a and Figure 4b The floating electrode 140 includes a fixed pin sleeve 141, a contact electrode 143, and an internal spring 145. One end of the fixed pin sleeve 141 is closed, and the other end is open. The contact electrode 143 is an electrode rod that is slidably inserted into the fixed pin sleeve 141. The internal spring 145 is located inside the fixed pin sleeve 141. The contact electrode 143 extends outward from the opening of the pin sleeve by the elastic force of the spring. A limiting step is provided on the lower outer circumference of the main body of the contact electrode 143. A nut 144 is provided at the opening of the fixed pin sleeve 141 to limit the maximum extension position of the contact electrode 143. The main body of the contact electrode 143 extends out from the through hole on the nut. The nut limits the maximum extension position of the contact electrode 143 by limiting the limiting step on it, and also prevents the contact electrode 143 from falling out of the fixed pin sleeve 141.

[0035] See you again Figure 1The sheath has several electrode holes 104. The fixing pin 141 of the floating electrode 140 is inserted and fixed within the electrode holes 104. The outer wall of the fixing pin and the inner wall of the electrode hole can be fixed by interference fit or threaded fit. A reinforcing boss is provided on the outer side of the electrode hole location on the sheath. The electrode hole 104 passes through the boss, increasing the length of the electrode hole 104 and creating a longer assembly length between the floating electrode 140 and the electrode hole 104, making the installation of the floating electrode 140 on the sheath structure more stable. The contact electrode 143 extends towards the inside of the sheath and is pressed against the outer periphery of the core by an internal spring 145. When there are irregular surfaces on the outer periphery of the core, the floating electrode 140 can automatically adjust the extension and retraction stroke of the contact electrode according to the undulations of the core surface, ensuring close contact between the electrode at each point and the core surface, improving the consistency and repeatability of electrical measurements. The closed outer end of the fixing pin 141 is provided with a second terminal 142 that is electrically connected to the contact electrode, allowing wiring of the floating electrode 140 from outside the sheath.

[0036] To achieve simultaneous multi-channel core electrical property measurement and spatial distribution analysis, this embodiment arranges 4×8 sets of equally spaced electrode holes 104 on the entire cylindrical shell of the sheath. Every 8 electrode holes are arranged along the same sheath axis, and the 4 rows of electrode holes are equally distributed along the circumference of the sheath. Floating electrodes 140 can be flexibly configured on the outer periphery of the core to realize the radial array measurement arrangement of the core.

[0037] In this embodiment, the conductive components, such as the copper electrode of the screw-in electrode and the contact electrode of the floating electrode, are all made of high-purity copper or gold-plated copper, which further improves the conductivity stability and service life.

[0038] In this document, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer", "vertical", and "horizontal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the purpose of clarifying the technical solution and for the convenience of description, and therefore should not be construed as limiting the present utility model.

[0039] In this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0040] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A core electrical radial array measurement device, characterized in that: The device includes a base (100) and a sheath set on the base (100). The core to be measured is placed inside the sheath. The sheath has screw-in electrodes (120) on both sides that clamp the core from the axial end faces of the core. The screw-in electrodes (120) on both sides of the sheath are coaxial with the sheath and arranged facing each other on the base (100), and a threaded transmission structure is provided between them and the base (100). The sheath has several floating electrodes (140). The floating electrodes (140) press against the outer peripheral side of the core inside the sheath along the radial direction of the sheath. The screw-in electrodes (120) and the floating electrodes (140) are electrically connected to the detection equipment to perform electrical measurements on the core.

2. The core electrical radial array measuring device according to claim 1, characterized in that: The sheath includes a lower cover (130) and an upper cover (131) that are split in half along the plane of the sheath axis. The lower cover (130) is supported and fixed on the base (100). The upper cover (131) and the lower cover (130) are assembled into a cylindrical shell of the sheath by a detachable connector.

3. The core electrical radial array measuring device according to claim 2, characterized in that: The sheath is a cylindrical shell that matches the cross-section of the rock core.

4. The core electrical radial array measuring device according to claim 1, characterized in that: The screw-in electrode (120) includes a copper electrode (121), a core positioning groove plate (123), and a threaded post (124). The core positioning groove plate (123) is provided with positioning grooves for embedding into the shaft end faces on both sides of the core. The copper electrode (121) is embedded in the positioning groove of the core positioning groove plate and electrically connected to the core end face embedded in the positioning groove. The threaded post (124) is vertically disposed on the back of the core positioning groove plate and is rotatably connected to the core positioning groove plate (123). Its axis coincides with the center of the positioning groove on the core positioning groove plate. The screw-in electrode (120) is threadedly connected to the support frame (101) on the base (100) through the threaded post (124).

5. The core electrical radial array measuring device according to claim 4, characterized in that: A knob (125) is fixedly provided on the threaded post (124).

6. The core electrical radial array measuring device according to claim 4, characterized in that: The copper electrode (121) is made of a copper sheet that matches the positioning groove, and a first terminal (122) is provided on it extending from the back of the core positioning groove plate.

7. The core electrical radial array measuring device according to claim 6, characterized in that: A conductive sponge soaked in conductive liquid is provided between the copper electrode (121) and the core end face, and a guide pipe (127) is provided at the bottom of the core positioning groove plate (123) to discharge the squeezed conductive liquid out of the positioning groove.

8. The core electrical radial array measuring device according to claim 7, characterized in that: The base below the spiral electrode (120) is provided with a collection tank (150) for collecting the extruded conductive liquid.

9. The core electrical radial array measuring device according to claim 1, characterized in that: The floating electrode (140) includes a fixed pin sleeve (141), a contact electrode (143), and an internal spring (145). The contact electrode (143) is inserted into the fixed pin sleeve (141). The fixed pin sleeve (141) is provided with an internal spring (145) that extends the contact electrode (143) outward. The opening of the fixed pin sleeve (141) is provided with a nut (144) that limits the maximum extension position of the contact electrode (143).

10. The core electrical radial array measuring device according to claim 9, characterized in that: The sheath is provided with a plurality of electrode holes (104). The fixing pin (141) of the floating electrode (140) is inserted and fixed in the electrode hole (104). The contact electrode (143) extends toward the inside of the sheath and is pressed into contact with the outer peripheral side of the core by an internal spring (145). The outer end of the fixing pin (141) is provided with a second terminal (142) that is electrically connected to the contact electrode.

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