Physical sample preparation equipment and method for casing pipe with eccentric wear inner wall

Abstract

The invention relates to physical sample preparation equipment and method for an inner wall eccentric wear sleeve, and the physical sample preparation equipment for the inner wall eccentric wear sleeve comprises a rotatable main shaft, and the outer side wall of the main shaft is sleeved with a grinding wheel structure; the sleeve is arranged on the outer side of the main shaft in a sleeving mode, and the axial direction of the sleeve is parallel to the axial direction of the main shaft; the first driving device is connected with the main shaft and can drive the main shaft to rotate; the second driving device is connected with the sleeve, can drive the sleeve to move in the radial direction so as to make contact with the grinding wheel structure, can apply a preset constant load to the sleeve, and can further drive the sleeve to continue to move in the radial direction in the process that the sleeve makes contact with the grinding wheel structure to generate frictional wear; and the sleeve and the grinding wheel structure are kept in a contact state under the action of the preset constant load, so that an eccentric wear groove is formed in the inner wall of the sleeve. According to the invention, the problem of lack of preparation of an eccentric wear sleeve material sample with a crescent-shaped inner wall in the prior art can be solved.

Description

Technical Field

[0001] This invention relates to the field of oil and gas field exploration and development, and in particular to a physical sample preparation device and method for an inner wall wear casing. Background Technology

[0002] During drilling operations in oil and gas exploration and development, drill strings inevitably come into contact with the wellbore or upper casing, resulting in friction and wear. This is especially true in ultra-deep and horizontal well drilling operations, where prolonged contact and friction between the drill string and the casing leads to frictional wear on the inner wall of the casing. This directly affects the casing's resistance to internal pressure and external extrusion, and can even cause casing rupture, resulting in the failure of the well equipment's integrity and preventing further drilling operations. Extensive field logging data shows that the frictional wear between the casing and drill string is mainly manifested as non-uniform wear of the casing's inner wall by the drill string, i.e., "crescent-shaped" uneven wear. However, the changes in the casing's load-bearing capacity after uneven wear are only qualitatively speculated upon and simulated using finite element methods (FEM). The proposed formulas for calculating the remaining strength of the casing after uneven wear and the results of FEM simulations lack verification from actual experimental data, and the accuracy of the results is not supported by experimental data. Currently, the equipment for evaluating the physical properties of casing, such as resistance to internal pressure and external extrusion, is very sophisticated. However, there is no experimental data on the load-bearing capacity of casings with crescent-shaped wear on the inner wall. The fundamental reason for this is that no method has been found to prepare physical specimens of casings with crescent-shaped wear on the inner wall. Summary of the Invention

[0003] The purpose of this invention is to provide a physical sample preparation device and method for an inner wall wear sleeve, which can solve the problem of the lack of physical samples for preparing inner wall "crescent-shaped" wear sleeves in the prior art.

[0004] The objective of this invention can be achieved using the following technical solutions:

[0005] This invention provides a physical sample preparation device for an inner wall wear sleeve, comprising:

[0006] A rotatable spindle has a grinding wheel structure fitted on its outer side wall. The grinding wheel structure includes a metal base ring and a sand layer ring connected in an inner and outer sleeve. The metal base ring is fitted on the spindle and detachably fixed to it. The metal base ring includes multiple metal rings arranged in axial sequence, with adjacent metal rings abutting each other. The sand layer ring includes multiple sand rings arranged in axial sequence, with each sand ring fitted and fixed on its corresponding metal ring. The two opposite end faces of two adjacent sand rings are parallel inclined end faces, and an inclined annular region is formed between the inclined end faces of two adjacent sand rings. The axial projection length of the inclined end face is greater than the gap of the annular region.

[0007] A radially movable sleeve is fitted on the outside of the main shaft, with its axis parallel to the axis of the main shaft.

[0008] The first drive device is connected to the main shaft and can drive the main shaft to rotate;

[0009] The second driving device is connected to the sleeve and can drive the sleeve to move radially to contact the grinding wheel structure. It can also apply a preset constant load to the sleeve and drive the sleeve to continue to move radially during the process of friction and wear between the sleeve and the grinding wheel structure, so that the sleeve and the grinding wheel structure are kept in contact under the preset constant load to form a wear groove on the inner wall of the sleeve.

[0010] In a preferred embodiment of the present invention, an elongated key block is provided on the outer side wall of the spindle along its axial direction, and a keyway is provided on the inner wall of the metal base ring, into which the key block can be inserted; an annular stop step is provided on the spindle, and the first end of the grinding wheel structure can abut against the stop step; a fixing ring is also sleeved on the spindle, and the fixing ring is threadedly connected to the spindle and abuts against the second end of the grinding wheel structure.

[0011] In a preferred embodiment of the present invention, the two opposite end faces of two adjacent metal rings are inclined surfaces, and the inclined surfaces are parallel to the inclined end faces of the sand ring.

[0012] In a preferred embodiment of the present invention, the sand ring is fixed at the center of the metal ring in the axial direction, and the distance between the end face of the sand ring and the corresponding end face of the metal ring is l / 2, where l is the gap of the annular region.

[0013] In a preferred embodiment of the present invention, the axial length of the grinding wheel structure is greater than or equal to 6 times the outer diameter of the sleeve.

[0014] In a preferred embodiment of the invention, the outer diameter of the grinding wheel structure is greater than or equal to 80% of the inner diameter of the sleeve.

[0015] In a preferred embodiment of the present invention, the physical sample preparation equipment for the inner wall abrasion sleeve further includes a coolant spraying device, wherein the spray pipe of the coolant spraying device extends into the sleeve and the spray nozzle of the spray pipe is located close to the grinding wheel structure.

[0016] In a preferred embodiment of the present invention, the physical sample preparation equipment for the inner wall wear sleeve further includes a base, a spindle clamping device, and a sleeve clamping device. The first driving device and the second driving device are both disposed on the base. The spindle clamping device can clamp and fix the bearing sleeved on the end of the spindle. The first driving device is connected to the end of the spindle. The sleeve clamping device can clamp and fix the sleeve. The second driving device is connected to the sleeve clamping device and can drive the sleeve clamping device to move radially along the sleeve.

[0017] In a preferred embodiment of the present invention, the axis of the spindle is arranged horizontally, the sleeve clamping device and the second driving device are arranged vertically, and a collection groove is provided on the base. The length of the collection groove along the axial direction of the sleeve is greater than the length of the sleeve. The coolant spraying device also includes a liquid storage device and a pumping device. The liquid storage device is connected to the spray pipe and connected to the collection groove through the return pipe. The pumping device is provided on the spray pipe or the return pipe.

[0018] This invention also provides a method for preparing a physical sample of an inner wall wear sleeve, wherein the above-mentioned physical sample preparation equipment for an inner wall wear sleeve is used for sample preparation, and the method for preparing a physical sample of an inner wall wear sleeve includes:

[0019] The sleeve is fitted onto the spindle, with the axis of the sleeve parallel to the axis of the spindle;

[0020] Drive the spindle to rotate; drive the sleeve to move radially, so that the sleeve contacts the grinding wheel structure on the spindle, and apply a preset constant load to the sleeve;

[0021] During the process of friction and wear between the sleeve and the grinding wheel structure, the sleeve is driven to continue to move radially, so that the sleeve and the grinding wheel structure are kept in contact under a preset constant load, so as to form a wear groove on the inner wall of the sleeve.

[0022] As described above, the physical sample preparation equipment and method for the inner wall eccentric wear sleeve of the present invention, through the cooperation of a rotatable spindle and a radially movable sleeve, and by applying load and radial displacement to the sleeve to cause its movement, allows the inner surface of the sleeve to contact the grinding wheel structure on the spindle, generating frictional wear, thereby achieving crescent-shaped eccentric wear on the inner wall of the sleeve. Simultaneously, the grinding wheel structure has high wear efficiency, which can improve sample preparation efficiency. Moreover, by controlling the axial projection length of the inclined end face to be greater than the gap of the annular region, it can be ensured that when the entire sand layer ring contacts and rubs against the sleeve, the frictional wear depth of the entire eccentric wear area is uniform along the axial direction. Using this equipment, "crescent-shaped" eccentric wear sleeve samples with different frictional wear depths and different axial lengths can be prepared. It can effectively achieve the formation of a sufficiently long "crescent-shaped" local eccentric wear along the axial direction on the inner wall of the sleeve in the same circumferential position, and the wear amount is controllable, providing physical test samples for subsequent physical evaluation tests. Attached Figure Description

[0023] The accompanying drawings are intended only to illustrate and explain the present invention and do not limit the scope of the invention.

[0024] in:

[0025] Figure 1 : A schematic diagram of the physical sample preparation equipment for the inner wall wear sleeve provided by the present invention.

[0026] Figure 2: This is a schematic diagram of the cooperation between the spindle and the grinding wheel structure provided by the present invention.

[0027] Figure 3 : This is a schematic diagram of the grinding wheel structure provided by the present invention.

[0028] Figure 4 : This is an end face view of the grinding wheel structure provided by the present invention.

[0029] Figure 5 : A schematic diagram of the intermediate grinding wheel provided by the present invention.

[0030] Explanation of icon numbers:

[0031] 1. Spindle; 11. Front clamping section; 12. Grinding wheel structure mounting section; 121. Key block; 13. Grinding wheel structure fixing section; 14. Tail clamping section; 15. Stop step; 16. Retaining ring;

[0032] 2. Grinding wheel structure; 21. Metal ring; 211. Sub-keyway; 22. Grinding ring; 23. Grinding wheel mounted on the left side; 24. Middle grinding wheel assembly; 25. Grinding wheel mounted on the right side;

[0033] 3. Sleeve;

[0034] 4. Sprinkler pipes;

[0035] 5. Base;

[0036] 6. Spindle clamping device; 61. Spindle holder;

[0037] 71. Support plate; 72. Sleeve clamp;

[0038] 8. Lifting cylinder. Detailed Implementation

[0039] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0040] like Figures 1 to 5 As shown, this application provides a physical sample preparation device for an inner wall wear sleeve, comprising:

[0041] A rotatable spindle 1 has a grinding wheel structure 2 fitted on its outer side wall. The grinding wheel structure 2 includes a metal base ring and a sand layer ring connected in an inner and outer sleeve. The metal base ring is fitted on the spindle 1 and detachably fixed to it. The metal base ring includes a plurality of metal rings 21 arranged in axial sequence, with two adjacent metal rings 21 abutting each other. The sand layer ring includes a plurality of sand rings 22 arranged in axial sequence. Each sand ring 22 is fitted and fixed on the corresponding metal ring 21 and forms a grinding wheel. The two opposite end faces of two adjacent sand rings 22 are inclined end faces that are parallel to each other. An inclined annular region is formed between the inclined end faces of two adjacent sand rings 22, and the axial projection length L of the inclined end face is greater than the gap l of the annular region (i.e., the assembly gap of the sand rings 22 between the grinding wheel structures 2).

[0042] A radially movable sleeve 3 is fitted on the outside of the main shaft 1, with its axis parallel to the axis of the main shaft 1.

[0043] The first drive device is connected to the main shaft 1 and can drive the main shaft 1 to rotate;

[0044] The second driving device is connected to the sleeve 3. It can drive the sleeve 3 to move radially to contact the grinding wheel structure 2, and can apply a preset constant load to the sleeve 3. It can also drive the sleeve 3 to continue to move radially during the process of friction and wear between the sleeve 3 and the grinding wheel structure 2, so that the sleeve 3 and the grinding wheel structure 2 are kept in contact under the preset constant load, so as to form a wear groove on the inner wall of the sleeve 3.

[0045] During sample preparation, the grinding wheel structure 2 can be replaced with a corresponding length according to the required length of the grinding groove, making replacement more convenient. The aforementioned sleeve 3 can be an actual sleeve, and only a portion of the actual sleeve length needs to be cut off. Generally, the sleeve 3 used in this application is about two meters long. Correspondingly, the axial length of the grinding wheel structure 2 is close to one meter, which is relatively long. If the grinding wheel structure 2 is a one-piece structure, it cannot be processed and is difficult to disassemble and replace, resulting in poor operability. In this embodiment, the grinding wheel structure 2 is composed of grinding wheels, each of which includes a metal ring 21 and a sand ring 22, which facilitates the processing and disassembly of the entire grinding wheel structure 2, as well as the connection and fixation of the grinding wheel structure 2 to the spindle 1. More importantly, the metal rings 21 are sequentially joined together along the axial direction. Since the sand rings 22 cannot abut against each other, in this embodiment, there is a gap between two adjacent sand rings 22, which is an inclined annular region. The opposite end faces of the adjacent sand rings 22 are designed as inclined end faces, and the axial projection length L of the inclined end faces is controlled to be greater than the gap l of the annular region. This ensures that two adjacent sand rings 22 do not abut against each other, and also ensures that when the entire sand layer ring comes into contact with the sleeve 3, the friction and wear depth of the entire uneven wear area is uniform along the axial direction without any steps.

[0046] In use, the sleeve 3 is fitted onto the spindle 1. After the first and second drive devices are connected, the first drive device drives the spindle 1 to rotate, and the second drive device drives the sleeve 3 to move radially to contact the grinding wheel structure 2, applying a preset constant load to the sleeve 3. Friction and wear occur when the inner wall of the sleeve 3 contacts the rotating grinding wheel structure 2. During this friction and wear process, the second drive device continues to drive the sleeve 3 to move radially, ensuring that the sleeve 3 and the grinding wheel structure 2 remain in contact under the preset constant load. The friction depth of the inner wall of the sleeve 3 can be controlled by controlling the duration of the preset constant load or the radial displacement of the sleeve 3. Sample preparation ends when the preset constant load has been applied for a preset time or the radial displacement of the sleeve 3 reaches the preset displacement. This friction and wear creates a crescent-shaped wear groove on the inner wall of the sleeve 3. The length of the grinding wheel structure 2 is also the length of this wear groove. Different wear lengths can be obtained by adjusting the length of the grinding wheel structure 2 before sample preparation.

[0047] In actual operation, the spindle 1 can be driven to rotate first and then the sleeve 3 can be driven to move and contact the grinding wheel structure 2. Alternatively, the sleeve 3 can be driven to move and contact the grinding wheel structure 2 first and then the spindle 1 can be driven to rotate. The specific method depends on the actual situation. In this embodiment, it is more preferable to drive the spindle 1 to rotate first and then drive the sleeve 3 to move, which will result in a greater starting force.

[0048] Therefore, the physical sample preparation equipment for the inner wall eccentric wear sleeve of this application, through the cooperation of a rotatable spindle 1 and a radially movable sleeve 3, applies a load and radial displacement to the sleeve 3, causing it to move. This allows the inner surface of the sleeve 3 to contact the grinding wheel structure 2 on the spindle 1, generating frictional wear and thus achieving crescent-shaped eccentric wear on the inner wall of the sleeve 3. Simultaneously, the grinding wheel structure 2 has high wear efficiency, improving sample preparation efficiency. Furthermore, by controlling the axial projection length L of the inclined end face to be greater than the gap l of the annular region, it can be ensured that when the entire sand layer ring contacts and rubs against the sleeve 3, the frictional wear depth of the entire eccentric wear area is uniform along the axial direction. Using this equipment, "crescent-shaped" eccentric wear sleeve samples with different frictional wear depths and different axial lengths can be prepared. This effectively achieves the formation of a sufficiently long, axially oriented "crescent-shaped" local eccentric wear on the inner wall of the sleeve 3 in the same circumferential orientation, with controllable wear amount, providing physical test samples for subsequent physical evaluation tests.

[0049] To facilitate the fixing of the grinding wheel structure 2, a long strip-shaped key block 121 is provided on the outer side wall of the spindle 1 along its axial direction. A keyway is provided on the inner wall of the metal base ring, and the key block 121 can be inserted into the keyway. An annular stop step 15 is protruding on the spindle 1, and the first end of the grinding wheel structure 2 can abut against the stop step 15. A fixing ring 16 is also sleeved on the spindle 1. The fixing ring 16 is threadedly connected to the spindle 1 and can abut against the second end of the grinding wheel structure 2.

[0050] Generally, in the design, the two opposite end faces of two adjacent metal rings 21 are also designed as inclined surfaces, which are parallel to the inclined end face of the sand ring 22. The sand ring 22 can be designed according to... Figure 5 The distance between the end face of the abrasive ring 22 and the corresponding end face of the metal ring 21, which is fixed at the center of the axial direction shown in the figure, is l / 2. It can be understood that a sub-keyway 211 is formed on the inner wall of each metal ring 21, and the sub-keyways 211 of multiple metal rings 21 constitute the aforementioned keyway. A key block 121 is inserted into each sub-keyway 211 to achieve circumferential fixation between the grinding wheel structure 2 and the spindle 1. Axial fixation between the grinding wheel structure 2 and the spindle 1 can be achieved by the cooperation of the stop step 15 and the fixing ring 16. Generally, the end faces of the metal rings 21 and abrasive rings 22 located at the ends, away from adjacent metal rings 21 and abrasive rings 22, can be planes, i.e., vertical planes perpendicular to the axis of the spindle 1.

[0051] In one specific embodiment, refer to Figure 3 and Figure 5 The entire grinding wheel structure 2 consists of multiple grinding wheels, arranged according to... Figure 3 The orientation shown includes a left-side grinding wheel 23, a middle grinding wheel group 24, and a right-side grinding wheel 25. The middle grinding wheel group 24 consists of multiple middle grinding wheels, each with two parallel inclined surfaces on both sides. There is one left-side grinding wheel 23 and one right-side grinding wheel 25. The left side of the left-side grinding wheel 23 is vertical, and the right side is inclined; the left side of the right-side grinding wheel 25 is inclined, and the right side is vertical. The inclined surfaces of the left-side and right-side grinding wheels 23 and 25 are parallel to the inclined surfaces of the middle grinding wheels, and their vertical surfaces are perpendicular to the axis of the spindle 1.

[0052] Reference Figure 2The spindle 1 is a stepped cylindrical shaft, consisting of a front clamping section 11, a grinding wheel structure mounting section 12, a grinding wheel structure fixing section 13, and a tail clamping section 14 connected in sequence. A stop step 15 is provided between the front clamping section 11 and the grinding wheel structure mounting section 12. A key block 121 is provided on the grinding wheel structure mounting section 12, and an external thread is provided on the grinding wheel structure fixing section 13. The inner surface of the retaining ring 16 is provided with an internal thread that matches the external thread of the grinding wheel structure fixing section 13. The grinding wheel structure 2 is assembled on the grinding wheel structure mounting section 12 of the spindle 1. The grinding wheel structure 2 is circumferentially fixed by the key block 121 and axially fixed by the stop step 15 and the retaining ring 16 on the spindle 1, thereby enabling the grinding wheel structure 2 to rotate with the spindle 1.

[0053] The axial length of the above-mentioned grinding wheel structure 2 can be adjusted by the number of grinding wheels, and the outer diameter of the grinding wheel should match the inner diameter of the sleeve 3.

[0054] Preferably, the axial length of the grinding wheel structure 2 is greater than or equal to 6 times the outer diameter of the sleeve 3. Within this range, the wear length of the wear groove obtained on the inner wall of the sleeve 3 can ensure that the experimental data will not be affected when performing tests such as resistance to external extrusion and resistance to internal pressure after the wear sample preparation is completed.

[0055] The outer diameter of the grinding wheel structure 2 is greater than or equal to 80% of the inner diameter of the casing 3, which is closer to the actual friction between the drill pipe joint and the casing 3, and is closer to the actual working conditions.

[0056] Furthermore, the physical sample preparation equipment for the inner wall abrasion sleeve also includes a coolant spraying device. The spray pipe 4 of the coolant spraying device extends into the sleeve 3, and the spray nozzle of the spray pipe 4 is located close to the grinding wheel structure 2. The coolant spraying device can provide coolant to the contact surface between the inner wall of the sleeve 3 and the grinding wheel structure 2 at the friction and wear point, thereby cooling the contact surface.

[0057] Reference Figure 1 The physical sample preparation equipment for the inner wall wear sleeve 3 also includes a base 5, a spindle clamping device 6, and a sleeve clamping device. The first drive device and the second drive device are both located on the base 5. The spindle clamping device 6 can clamp and fix the bearing sleeved on the end of the spindle 1. The first drive device is connected to the end of the spindle 1. The sleeve clamping device can clamp and fix the sleeve 3. The second drive device is connected to the sleeve clamping device and can drive the sleeve clamping device to move radially along the sleeve 3.

[0058] Because the sleeve 3 and the main shaft 1 are relatively long, for easier operation, the axes of the main shaft 1 and the sleeve 3 are arranged horizontally. The base 5 can adopt a plate-like structure and be set horizontally. The sleeve clamping device and the second drive device are arranged vertically. The base 5 is the supporting structure of the entire sample preparation equipment. The main shaft clamping device 6, the first drive device and the second drive device are all fixed on the base 5.

[0059] For example, refer to Figure 1 The spindle clamping device 6 includes two spindle clamps 61 arranged at intervals on the base 5, which respectively clamp and fix two bearings sleeved on both ends of the spindle 1. The first drive device can be a motor, the output shaft of which is connected to the end of the spindle 1 to drive the spindle 1 to rotate. The speed and rotation time of the spindle 1 are adjustable and controllable. The sleeve clamping device includes a support plate 71 and two sleeve clamps 72 arranged at intervals on the support plate 71. The second drive device includes at least one lifting cylinder 8, which is fixed on the base 5. The upper end of its piston rod is fixed to the support plate 71. By driving the support plate 71 to move up and down, the sleeve 3 is driven to move radially through the sleeve clamps 72. The second drive device can control the friction wear depth of the inner wall of the sleeve 3 by the load application time or displacement.

[0060] The central axes of the two spindle holders 61 coincide. The spindle holders 61 are mainly for facilitating the clamping and fixing of the bearing at the end of the spindle 1. The sleeve holder 72 is mainly for facilitating the clamping and fixing of the sleeve 3. The sleeve clamping system is located between the two spindle holders 61, and the spindle 1 passes through the inner hole of the clamped and fixed sleeve 3. The spindle holders 61 and the sleeve holder 72 may each include an upper semi-circular seat and a lower semi-circular seat arranged vertically. One end of the upper semi-circular seat can be hinged to one end of the lower semi-circular seat, and the other end of the upper semi-circular seat can be locked to the other end of the lower semi-circular seat through a locking structure. After the upper semi-circular seat is opened, the spindle 1 or sleeve 3 with the bearing sleeve can be placed into the lower semi-circular seat. Then, the upper semi-circular seat is closed and locked to the lower semi-circular seat through the locking structure, thus fixing the bearing or sleeve 3. Of course, the first drive device, the second drive device, the spindle clamping device 6 and the sleeve clamping device can also adopt other structural forms. This embodiment is only for illustrative purposes.

[0061] To facilitate the collection and recycling of coolant, a collection trough is provided on the base 5, with the length of the collection trough along the axial direction of the sleeve 3 being greater than the length of the sleeve 3. The coolant spraying device also includes a storage device and a pumping device. The storage device is connected to the spray pipe 4 and to the collection trough via a return pipe. The pumping device is located on either the spray pipe 4 or the return pipe. The storage device stores coolant. After the coolant is sprayed through the spray pipe 4 to the contact surface between the inner wall of the sleeve 3 and the grinding wheel structure 2, it can flow out from the openings at both ends of the sleeve 3 and into the collection trough, then return to the storage device via the return pipe, thus forming a circulation.

[0062] Furthermore, the sample preparation equipment also includes a control system, which is electrically connected to the first drive unit, the second drive unit, and the pumping unit to achieve automatic control.

[0063] In summary, the sample preparation equipment in this embodiment drives the spindle 1, which is equipped with the grinding wheel structure 2, to rotate via the first driving device. The sleeve 3 is fitted onto the spindle 1 through the sleeve clamping system. The second driving device applies a load or displacement to the sleeve clamping system, causing the sleeve 3 to move. This causes the inner surface of the sleeve 3 to come into contact with the grinding wheel structure 2 fixed on the spindle 1, generating friction and wear, thereby achieving crescent-shaped uneven wear on the inner wall of the sleeve 3. The unique design that the axial projection length of the inclined surface of the grinding wheel (i.e., the axial projection length L of the inclined end face) is greater than the assembly gap between the grinding wheels in the grinding wheel structure 2 (i.e., the gap l in the annular area) ensures that the friction and wear depth of the entire crescent-shaped uneven wear area is uniform along the axial direction without any steps. This equipment can be used to prepare crescent-shaped wear casing samples with different friction and wear depths and different axial lengths, providing samples for the test evaluation of the actual performance of crescent-shaped wear casing, obtaining test data of casing actual performance with different crescent-shaped wear amounts, and providing scientific data support for the quantitative analysis of the service load-bearing capacity and safety reliability evaluation of casing strings after different degrees of crescent-shaped wear in oil and gas exploration and development.

[0064] Furthermore, this application also provides a method for preparing a physical sample of an inner wall wear sleeve, using the aforementioned equipment for preparing a physical sample of an inner wall wear sleeve. The method for preparing a physical sample of an inner wall wear sleeve includes:

[0065] The sleeve 3 is fitted onto the spindle 1, and the axis of the sleeve 3 is parallel to the axis of the spindle 1;

[0066] Drive the spindle 1 to rotate; drive the sleeve 3 to move radially, so that the sleeve 3 contacts the grinding wheel structure 2 on the spindle 1, and apply a preset constant load to the sleeve 3;

[0067] During the process of friction and wear between the sleeve 3 and the grinding wheel structure 2, the sleeve 3 is driven to continue to move radially, so that the sleeve 3 and the grinding wheel structure 2 are kept in contact under a preset constant load, so as to form a wear groove on the inner wall of the sleeve 3.

[0068] The sample preparation method can be carried out using the aforementioned sample preparation equipment. The specific operation process and effects have been described in detail above and will not be repeated here.

[0069] The above are merely illustrative embodiments of the present invention and are not intended to limit the scope of the invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A physical sampling device for an inner wall eccentrically worn casing, characterized by, The equipment comprises: a rotatable main shaft, a grinding wheel structure being sleeved on the outer wall of the main shaft; the grinding wheel structure comprises a metal base ring and a sand layer ring which are connected in an inner and outer sleeving manner, the metal base ring is sleeved on the main shaft and detachably fixed to the main shaft; the metal base ring comprises a plurality of metal rings arranged in an axial sequence, and adjacent two metal rings are arranged in abutment; the sand layer ring comprises a plurality of sand rings arranged in an axial sequence, each sand ring is fixedly sleeved on a corresponding metal ring, and the opposite end faces of adjacent two sand rings are both inclined end faces parallel to each other, an inclined annular area is formed between the inclined end faces of adjacent two sand rings, and the axial projection length of the inclined end faces is greater than the gap of the annular area; a radially movable sleeve pipe which is sleeved on the outer side of the main shaft and is axially parallel to the axial direction of the main shaft; a first driving device connected with the main shaft and capable of driving the main shaft to rotate; a second driving device connected with the sleeve pipe, capable of driving the sleeve pipe to move radially to contact the grinding wheel structure, capable of applying a preset constant load to the sleeve pipe, and capable of driving the sleeve pipe to continue to move radially during the friction and wear of the sleeve pipe and the grinding wheel structure in contact, so that the sleeve pipe and the grinding wheel structure are kept in contact under the action of the preset constant load, to form a eccentric wear groove on the inner wall of the sleeve pipe.

2. The equipment according to claim 1, wherein a long strip-shaped key block is arranged on the outer wall of the main shaft along the axial direction thereof, a key groove is arranged on the inner wall of the metal base ring, and the key block is inserted into the key groove; an annular stop step is protruded on the main shaft, the first end of the grinding wheel structure is capable of abutting against the stop step, and a fixing ring is further sleeved on the main shaft, the fixing ring is threadedly connected with the main shaft and is capable of abutting against the second end of the grinding wheel structure.

3. The equipment according to claim 1, wherein the opposite end faces of adjacent two metal rings are inclined faces parallel to the inclined end faces of the sand rings.

4. The equipment according to claim 3, wherein the sand ring is fixed at the middle of the axial direction of the metal ring, and the distance between the end face of the sand ring and the corresponding end face of the metal ring is l / 2, wherein l is the gap of the annular area.

5. The equipment according to claim 1, wherein the axial length of the grinding wheel structure is greater than or equal to 6 times the outer diameter of the sleeve pipe.

6. The equipment according to claim 1, wherein the outer diameter of the grinding wheel structure is greater than or equal to 80% of the inner diameter of the sleeve pipe.

7. The equipment according to claim 1, further comprising a cooling liquid spraying device, a spraying pipe of the cooling liquid spraying device extends into the sleeve pipe, and a spraying opening of the spraying pipe is arranged close to the grinding wheel structure. ​ 8. The inner wall eccentric wear casing physical sample preparation device according to claim 7, characterized in that, the inner wall eccentric wear casing physical sample preparation device further comprises a base, a spindle clamping device and a casing clamping device, the first driving device and the second driving device are arranged on the base; the spindle clamping device can clamp and fix the bearing arranged at the end of the spindle, the first driving device is connected with the end of the spindle; the casing clamping device can clamp and fix the casing, the second driving device is connected with the casing clamping device and can drive the casing clamping device to move along the radial direction of the casing.

9. The inner wall eccentric wear casing physical sample preparation device according to claim 8, characterized in that, the axis of the spindle is arranged horizontally, the casing clamping device and the second driving device are arranged vertically, a collecting groove is arranged on the base, the length of the collecting groove along the axial direction of the casing is greater than the length of the casing; the cooling liquid spraying device further comprises a liquid storage device and a pumping device, the liquid storage device is connected with the spraying pipe and connected with the collecting groove through a return pipe, the pumping device is arranged on the spraying pipe or the return pipe.

10. A method of preparing a physical sample of an inner wall eccentrically worn casing pipe, characterized by, The inner wall eccentric wear casing physical sample preparation method is prepared by using the inner wall eccentric wear casing physical sample preparation device according to any one of claims 1-9, the method comprising: sleeving the casing on the spindle, and the axis of the casing is parallel to the axis of the spindle; driving the spindle to rotate; driving the casing to move radially, so that the casing is in contact with the grinding wheel structure on the spindle, and a predetermined constant load is applied to the casing; during the friction and wear between the casing and the grinding wheel structure, the casing continues to move radially, so that the casing and the grinding wheel structure maintain the contact state under the action of the predetermined constant load, so as to form an eccentric wear groove on the inner wall of the casing.

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