Crack width adjustable core holder and crack width adjusting method
By introducing the seam width adjustment component and the thermoplastic tube extrusion component into the core holder, the problem that the core holder cannot adjust the width of the core crack is solved, and the real simulation of underground cracks and the accuracy of the test results is achieved.
Patent Information
- Application Number
- CN202311563486.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-22
- Publication Date
- 2025-05-23
AI Technical Summary
The existing core holder cannot adjust the width of the core fracture, resulting in a gap between the core and the thermoplastic pipe when the drilling fluid flows in or the underground pressure changes, resulting in the loss of drilling fluid and affecting the test results.
A core holder including a seam width adjustment assembly and a thermoplastic tube extrusion assembly is designed. The core holder is driven to adjust the crack width through the seam width adjustment assembly, and dynamic extrusion of the thermoplastic tube is achieved through the thermoplastic tube extrusion assembly to avoid the formation of gaps.
The adjustability of the width of the core fracture is achieved, the real situation of underground fractures is simulated, and the gap between the core and the thermoplastic pipe is avoided, which prevents drilling fluid from being lost, and ensures the accuracy of the test.
Smart Images
Figure CN120028209A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of crack width adjustment, and in particular to a core holder with adjustable crack width and a crack width adjustment method. Background Art
[0002] The core holder is a tool used to clamp, protect the rock sample and seal the cooking surface or end face (generally the end face for leaving the fluid inlet and outlet) when measuring the seepage characteristics of the rock sample in the laboratory or conducting displacement tests. It is an indispensable and important auxiliary component in the development of experimental instruments and devices. At present, the commonly used core holder structures are mainly divided into four types, Hasler type core holder, two-axial core holder (static pressure core holder), three-axial core holder, core holder for the pressure hole to be tested and embedded core holder, etc. The above core holders cannot adjust the width of the core crack during use. In the actual drilling process, the cracks under the ground usually change the crack width with the inflow of drilling fluid or the change of underground pressure. Therefore, some core holders that can adjust the crack width have appeared to simulate the change of underground crack width. However, during the change of the core crack width, a gap will be generated between the core and the thermoplastic tube, causing the drilling fluid to flow into the gap and affect the test. Summary of the invention
[0003] The purpose of the present invention is to provide a core clamp with adjustable crack width and a crack width adjustment method, which can realize the adjustment of the core crack width, thereby simulating the real situation of underground cracks. At the same time, the setting of the thermoplastic tube extrusion assembly can solve the problem of gaps between the core and the thermoplastic tube during the change of the core crack width, thereby avoiding the drilling fluid from flowing into the gap and affecting the test.
[0004] The present invention is achieved through the following technical solutions:
[0005] A core clamp with adjustable crack width, comprising a core clamp, a thermoplastic tube, a crack width adjustment component and a thermoplastic tube extrusion component, wherein two core clamps respectively clamp cores on both sides of the crack, and the crack width adjustment component is arranged on the back of the core clamp and drives the two core clamps to move closer to or farther from each other; the thermoplastic tube is sleeved on the core clamp, and the driving end of the thermoplastic tube extrusion component abuts against the thermoplastic tube; the thermoplastic tube extrusion component is arranged at both ends of the crack, and the driving direction of the thermoplastic tube extrusion component points to the crack width. In order to solve the above technical problems and achieve corresponding technical effects, the present invention drives the core clamp to adjust the crack width through the crack width adjustment component, thereby simulating the real situation of underground cracks, and at the same time uses the thermoplastic tube extrusion component to achieve the dynamic extrusion effect of the thermoplastic tube, thereby avoiding the generation of a gap between the core and the thermoplastic tube during the change of the crack width of the core, thereby avoiding the drilling fluid from flowing into the gap and affecting the test.
[0006] Further technical solutions:
[0007] Further: the seam width adjustment assembly includes a vacuum absorber, a telescope and a first support plate, the fixed end of the telescope is fixed to the first support plate, and the driving end of the telescope is connected to the vacuum absorber;
[0008] Furthermore: an adsorption plane is arranged on the back of the core holder, and the vacuum adsorber is adsorbed on the adsorption plane.
[0009] Further: the thermoplastic tube extrusion assembly comprises a limit plate, a limit rod, a driving platform and a second support plate, one end of the limit rod is arranged on the driving platform, and the driving platform drives the limit rod to extend or retract;
[0010] Further: the other end of the limit rod is connected to the limit plate, and the limit plate abuts against the thermoplastic tube;
[0011] Further: the driving platform is arranged on the second supporting plate, and the second supporting plate is arranged on a sliding platform arranged on the fixed platform.
[0012] Furthermore: the limiting plate and the fixing platform enclose a cavity, and the core clamp is arranged in the cavity.
[0013] Further: the driving platform comprises a driving cavity, one end of the limiting rod penetrates into the driving cavity, and a limiting head is arranged at the end of the limiting rod, and the limiting head slides along the axial direction of the driving cavity;
[0014] Further: the end of the driving cavity is provided with a limiting seat for limiting the position of the limiting head;
[0015] Further: the driving chamber is connected to an external pressurizing device.
[0016] Furthermore: a plurality of the thermoplastic tube extrusion assemblies are arranged at both ends of the crack, and the plurality of the thermoplastic tube extrusion assemblies are arranged closely along the width direction of the crack, and the limiting plates of each thermoplastic tube extrusion assembly are in contact with the thermoplastic tube.
[0017] Further: both sides of the core holder are inclined slope structures, and the inclined slope structures are inclined from the side where the seam width adjustment component is set to the side of the crack;
[0018] Furthermore: the plurality of limiting plates are adapted to abut against the thermoplastic tube with an inclined slope structure.
[0019] Further: the fixing platform is provided with a screw rod polished rod module for driving the second support plate, the screw rod polished rod module includes a screw rod and a polished rod, and the screw rod and the polished rod are both arranged on the fixing platform through a support column;
[0020] Further: the screw rod is threadably matched with the second support plate, the screw rod passes through the two second support plates, and drives the two second support plates to move closer or farther away;
[0021] Furthermore, the polished rod is slidably matched with the second support plate, the polished rod passes through two second support plates, and the two second support plates slide along the polished rod to approach or move away from each other.
[0022] The seam width adjustment method using the core clamp comprises the following steps:
[0023] Step S1: configuring a core holder;
[0024] Step S2: installing a thermoplastic tube;
[0025] Step S3: configuring a seam width adjustment component;
[0026] Step S4: adjusting the crack width;
[0027] Step S5: configuring a thermoplastic tube extrusion assembly.
[0028] Further: in step S1, two core holders are fixed to the back sides of the two core halves by bolts respectively;
[0029] In step S2, the same thermoplastic tube is sleeved on the outer surfaces of the two core holders, and both ends of the thermoplastic tube are fixedly connected to the plugs, and the thermoplastic tube is heated and shrunk after being set in place;
[0030] In step S3, the vacuum absorber is pushed to the absorption plane on the back of the core holder by using the telescopic device, and the vacuum absorber is absorbed on the absorption plane;
[0031] In step S4, the core holder and the core are moved closer to or farther from each other by the expansion and contraction of the expansion joint, so as to adjust the crack width;
[0032] In step S5, the driving platform is started to extend the limit rod to the maximum extension distance, and the second support plate is moved closer to the crack. During the movement of the second support plate, the limit plates are successively abutted against the thermoplastic tube. The limit plate set in the middle position pushes the thermoplastic tube to the edge of the crack and stops, and the second support plate is fixed.
[0033] Compared with the prior art, the present invention has the following advantages and beneficial effects:
[0034] 1. The present invention provides a core holder with adjustable crack width. The crack width is adjusted by driving the core holder through a crack width adjustment component, thereby simulating the actual situation of underground cracks. At the same time, a thermoplastic tube extrusion component is used to achieve a dynamic extrusion effect on the thermoplastic tube, thereby avoiding the generation of a gap between the core and the thermoplastic tube during the change of the core crack width, thereby avoiding the drilling fluid from flowing into the gap and affecting the test. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:
[0036] Figure 1 It is a schematic diagram of the structure of the present invention;
[0037] Figure 2 It is a schematic diagram of the thermoplastic tube wrapped clamp and core structure;
[0038] Figure 3 It is a schematic diagram of the structure of the fixed platform and its corresponding components;
[0039] Figure 4 It is a schematic diagram of the structure of the driving platform and the limiting rod;
[0040] Figure 5 This is a flow chart of the method in Example 2.
[0041] Marks and corresponding parts names in the attached drawings:
[0042] 1-core holder, 2-thermoplastic tube, 3-slit width adjustment assembly, 4-thermoplastic tube extrusion assembly, 5-core, 6-fixed table, 7-cavity, 31-vacuum absorber, 32-telescope, 33-first support plate, 41-limit plate, 42-limit rod, 43-driving table, 44-second support plate, 45-screw, 46-light rod, 47-support column, 431-driving cavity, 432-limit head, 433-limit seat. DETAILED DESCRIPTION
[0043] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.
[0044] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to one of ordinary skill in the art that these specific details are not necessarily employed to practice the present invention. In other embodiments, in order to avoid obscuring the present invention, well-known structures, circuits, materials, or methods are not specifically described.
[0045] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. In addition, it will be appreciated by those of ordinary skill in the art that the figures provided herein are for illustrative purposes and that the figures are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0046] In the description of the present invention, the directions or positional relationships indicated by terms such as “front”, “rear”, “left”, “right”, “up”, “down”, “vertical”, “horizontal”, “high”, “low”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.
[0047] Example 1
[0048] like Figure 1 to Figure 4As shown, a core clamp with adjustable crack width of the present invention comprises a core clamp 1, a thermoplastic tube 2, a crack width adjustment component 3 and a thermoplastic tube extrusion component 4, wherein two core clamps 1 respectively clamp cores 5 on both sides of the crack, and the crack width adjustment component 3 is arranged on the back of the core clamp 1, and drives the two core clamps 1 to move closer to or away from each other; in this embodiment, the core clamp 1 is first connected to the core 5, and the crack width adjustment component 3 drives the core 5 connected to the core clamp 1, so as to adjust the crack width, so that the device can effectively simulate the change of underground cracks; and the specific change value of the crack width can be directly obtained by observing the length change of the driving member of the crack width adjustment component 3; the thermoplastic tube 2 is sleeved on the core clamp 1, and the driving end of the thermoplastic tube extrusion component 4 abuts against the thermoplastic tube 2; the thermoplastic tube extrusion component 4 is arranged at both ends of the crack, and the driving direction of the thermoplastic tube extrusion component 4 points to the crack width. In this embodiment, when the thermoplastic tube 2 is sleeved on the core clamp 1 and the crack width is adjusted, the thermoplastic tube extrusion assembly 4 can effectively extrude the thermoplastic tube 2 onto the surface of the core clamp 1, thereby avoiding the generation of a gap between the core and the thermoplastic tube during the change of the core crack width, thereby avoiding the drilling fluid from flowing into the gap and affecting the test.
[0049] The seam width adjustment component 3 includes a vacuum absorber 31, an expander 32 and a first support plate 33. The fixed end of the expander 32 is fixed to the first support plate 33, and the driving end of the expander 32 is connected to the vacuum absorber 31. An adsorption plane is set on the back of the core clamp 1, and the vacuum absorber 31 is adsorbed on the adsorption plane. In this embodiment, the vacuum absorber 31 is used to realize the connection between the seam width adjustment component 3 and the core clamp 1, and the expansion joint 32 is used to realize the driving effect of the core clamp 1, so as to achieve the effect of crack width adjustment; and other connection structures that can realize the connection between the seam width adjustment component 3 and the core clamp 1 can effectively replace the vacuum absorber 31 structure used in this embodiment. And in the specific test process, the change value of the crack width can be directly reflected by the expansion and contraction amount of the expander 32.
[0050] The thermoplastic tube extrusion assembly 4 includes a limit plate 41, a limit rod 42, a driving platform 43 and a second support plate 44. One end of the limit rod 42 is arranged on the driving platform 43, and the driving platform 43 drives the limit rod 42 to extend or retract; the other end of the limit rod 42 is connected to the limit plate 41, and the limit plate 41 abuts against the thermoplastic tube 2; the driving platform 43 is arranged on the second support plate 44, and the second support plate 44 is arranged on the fixed platform 6 for sliding. In this embodiment, when the driving platform 43 starts to work, the limit rod 42 can be driven to drive the limit plate 41 to dynamically abut against the outer surface of the thermoplastic tube 2, thereby avoiding the generation of a gap between the core and the thermoplastic tube during the change of the core crack width, thereby avoiding the drilling fluid from flowing into the gap and affecting the test. And the fixed platform 6 is used to provide a place for the installation and fixation of the above structure, and the limit plate 41 and the fixed platform 6 enclose a cavity 7, and the core clamp 1 is arranged in the cavity 7. Specifically, the driving platform 43 includes a driving cavity 431, one end of the limiting rod 42 penetrates into the driving cavity 431, and a limiting head 432 is arranged at the end of the limiting rod 42, and the limiting head 432 slides along the axial direction of the driving cavity 431; a limiting seat 433 for limiting the limiting head 432 is arranged at the end of the driving cavity 431; and the driving cavity 431 is connected with an external pressurizing device. When working, the external pressurizing device pressurizes or releases the driving cavity 431, so as to achieve a dynamic extrusion effect on the thermoplastic tube 2 through the limiting head 432 (similar to a piston cylinder structure) arranged in the driving cavity 431 and the limiting plate 41 driven by the limiting rod 42. Further, multiple thermoplastic tube extrusion assemblies 4 are arranged at both ends of the crack, and the multiple thermoplastic tube extrusion assemblies 4 are arranged closely along the width direction of the crack, and the limiting plate 41 of each thermoplastic tube extrusion assembly 4 abuts against the thermoplastic tube 2. The provision of multiple thermoplastic tube extrusion assemblies 4 can effectively reduce the width of each limiting plate 41, and can more effectively complete the extrusion effect of the thermoplastic tube 2, ensuring that the thermoplastic tube 2 is in close contact with the surface of the core holder 1, avoiding the formation of a gap between the thermoplastic tube 2 and the core 5, and thus avoiding the drilling fluid from flowing into the gap and affecting the test. Furthermore, both sides of the core holder 1 are inclined ramp structures, and the inclined ramp structures are inclined from the side where the seam width adjustment assembly 3 is provided to the side of the crack; and the multiple limiting plates 41 are adapted to the inclined ramp structure to abut against the thermoplastic tube 2.
[0051] In this embodiment, a screw rod and light rod module is preferably used to realize the two second support plates 44 approaching or moving away from each other. Specifically, a screw rod and light rod module for driving the second support plate 44 is provided on the fixed platform 6, and the screw rod and light rod module includes a screw rod 45 and a light rod 46, and the screw rod 45 and the light rod 46 are both arranged on the fixed platform 6 through a support column 47; the screw rod 45 is threadedly matched with the second support plate 44, the screw rod 45 passes through the two second support plates 44, and drives the two second support plates 44 to approach or move away from each other; the light rod 46 is slidably matched with the second support plate 44, the light rod 46 passes through the two second support plates 44, and the two second support plates 44 slide along the light rod 46 to approach or move away from each other.
[0052] Example 2
[0053] like Figure 5 As shown, this embodiment, based on Embodiment 1, provides a method for adjusting the seam width using the core clamp of Claim 1, comprising the following steps:
[0054] Step S1: configuring a core holder 1;
[0055] Step S2: sleeve the thermoplastic tube 2;
[0056] Step S3: configuring the seam width adjustment component 3;
[0057] Step S4: adjusting the crack width;
[0058] Step S5: configuring the thermoplastic tube extrusion assembly 4.
[0059] More specifically, in step S1, two core holders 1 are fixed to the back sides of two core halves 5 by bolts respectively;
[0060] In step S2, the same thermoplastic tube 2 is sleeved on the outer surfaces of the two core holders 1, and both ends of the thermoplastic tube 2 are fixedly connected to the plugs, and the thermoplastic tube 2 is heated and shrunk after being set in place;
[0061] In step S3, the vacuum absorber 31 is pushed to the absorption plane on the back of the core holder 1 by using the telescopic device 32, and the vacuum absorber 31 is absorbed on the absorption plane;
[0062] In step S4, the core holder 1 and the core 5 are moved closer to or away from each other by the expansion and contraction of the expansion device 32, so as to adjust the crack width;
[0063] In step S5, the driving platform 43 is started to extend the limit rod 42 to the maximum extension distance, and the second support plate 44 is moved close to the crack. During the movement of the second support plate 44, the limit plate 41 is successively abutted against the thermoplastic tube 2. The limit plate 41 set in the middle position pushes the thermoplastic tube 2 to the edge of the crack to stop, and fixes the second support plate 44.
[0064] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A core holder with adjustable crack width, It is characterized in that The invention comprises a core clamp (1), a thermoplastic tube (2), a seam width adjustment component (3) and a thermoplastic tube extrusion component (4), wherein the two core clamps (1) respectively clamp the cores (5) on both sides of the crack, and the seam width adjustment component (3) is arranged on the back of the core clamp (1) and drives the two core clamps (1) to move closer to or farther from each other; The thermoplastic tube (2) is sleeved on the core holder (1), and the driving end of the thermoplastic tube extrusion assembly (4) abuts against the thermoplastic tube (2); The thermoplastic tube extrusion assembly (4) is arranged at both ends of the crack, and the driving direction of the thermoplastic tube extrusion assembly (4) points to the crack width.
2. A core holder with adjustable crack width according to claim 1, It is characterized in that The seam width adjustment assembly (3) comprises a vacuum absorber (31), a telescopic device (32) and a first support plate (33); the fixed end of the telescopic device (32) is fixed to the first support plate (33), and the driving end of the telescopic device (32) is connected to the vacuum absorber (31); A suction plane is arranged on the back of the core holder (1), and the vacuum absorber (31) is sucked onto the suction plane.
3. A core holder with adjustable crack width according to claim 1, It is characterized in that The thermoplastic tube extrusion assembly (4) comprises a limiting plate (41), a limiting rod (42), a driving platform (43) and a second supporting plate (44); one end of the limiting rod (42) is arranged on the driving platform (43), and the driving platform (43) drives the limiting rod (42) to extend or retract; The other end of the limiting rod (42) is connected to the limiting plate (41), and the limiting plate (41) abuts against the thermoplastic tube (2); The driving platform (43) is arranged on the second supporting plate (44), and the second supporting plate (44) is arranged on a fixed platform (6) for sliding.
4. A core holder with adjustable crack width according to claim 3, It is characterized in that The limiting plate (41) and the fixing platform (6) enclose a cavity (7), and the core clamp (1) is arranged in the cavity (7).
5. A core holder with adjustable crack width according to claim 3, It is characterized in that The driving platform (43) comprises a driving cavity (431), one end of the limiting rod (42) penetrates into the driving cavity (431), and a limiting head (432) is provided at the end of the limiting rod (42), and the limiting head (432) slides along the axial direction of the driving cavity (431); The end of the driving cavity (431) is provided with a limiting seat (433) for limiting the position of the limiting head (432); The driving chamber (431) is in communication with an external pressurizing device.
6. A core holder with adjustable crack width according to claim 3, It is characterized in that A plurality of thermoplastic tube extrusion assemblies (4) are arranged at both ends of the crack, and the plurality of thermoplastic tube extrusion assemblies (4) are arranged closely along the width direction of the crack, and the limiting plate (41) of each thermoplastic tube extrusion assembly (4) abuts against the thermoplastic tube (2).
7. A core holder with adjustable crack width according to claim 6, It is characterized in that Both sides of the core clamp (1) are inclined slope structures, and the inclined slope structures are inclined from the side where the crack width adjustment component (3) is arranged to the side of the crack; Furthermore, the multiple limiting plates (41) are adapted to a slanted slope structure to abut against the thermoplastic tube (2).
8. A core holder with adjustable crack width according to claim 3, It is characterized in that The fixed platform (6) is provided with a screw rod polished rod module for driving the second support plate (44), the screw rod polished rod module comprising a screw rod (45) and a polished rod (46), and the screw rod (45) and the polished rod (46) are both arranged on the fixed platform (6) through a support column (47); The screw rod (45) is threadably matched with the second support plate (44), and the screw rod (45) passes through the two second support plates (44) and drives the two second support plates (44) to move closer or farther away; The light rod (46) is slidably matched with the second support plate (44); the light rod (46) passes through two second support plates (44), and the two second support plates (44) slide along the light rod (46) to approach or move away from each other.
9. A method for adjusting the seam width of a core holder according to any one of claims 1 to 8, It is characterized in that The steps include: Step S1: configuring a core holder (1); Step S2: sleeve the thermoplastic tube (2); Step S3: configuring the seam width adjustment component (3); Step S4: adjusting the crack width; Step S5: configuring the thermoplastic tube extrusion assembly (4).
10. A method for adjusting the slit width according to claim 9, It is characterized in that In step S1, two core holders (1) are fixed to the back sides of two core halves (5) by bolts respectively; In step S2, the same thermoplastic tube (2) is sleeved on the outer surfaces of the two core holders (1), and both ends of the thermoplastic tube (2) are fixedly connected to the plugs, and after the thermoplastic tube (2) is in place, it is heated and shrunk; In step S3, the vacuum absorber (31) is pushed to the absorption plane on the back of the core holder (1) by using the telescopic device (32), and the vacuum absorber (31) is absorbed on the absorption plane; In step S4, the core holder (1) and the core (5) are moved closer to or farther from each other by the expansion and contraction of the expansion device (32), thereby adjusting the width of the crack; In step S5, the driving platform (43) is started to extend the limit rod (42) to the maximum extension distance, and the second support plate (44) is moved close to the crack. During the movement of the second support plate (44), the limit plates (41) are successively abutted against the thermoplastic tube (2). The limit plate (41) set at the middle position pushes the thermoplastic tube (2) to the edge of the crack and stops, and the second support plate (44) is fixed.