Drilling type side wall corer filter convenient to replace

Abstract

The utility model relates to the technical field of filters, and discloses a drilling type side wall corer filter convenient to replace, which comprises two filter shells, the two filter shells are correspondingly arranged up and down, two arc-shaped mounting grooves are formed in the opposite inner walls of the two filter shells, and fixing assemblies are arranged on the two arc-shaped mounting grooves. The fixing assembly is arranged on the four arc-shaped mounting grooves and the two filter shells, the fixing assembly comprises two mounting sleeves, the upper surfaces and the lower surfaces of the two mounting sleeves are clamped into the inner walls of the corresponding arc-shaped mounting grooves respectively, and through the design of air cylinder driving clamping-arc-shaped groove positioning, quick replacement and stable fixing of the filter element are achieved; the problems that a traditional filter is tedious in replacement and ineffective in sealing are solved, manual intervention is reduced through automatic operation of the air cylinder, the device adapts to the severe environment in drilling operation, drilling fluid leakage is effectively prevented through cooperation of the sealing plate and the sealing groove, and the operation efficiency and reliability of the well wall corer are improved.

Description

An easy-to-replace filter for drilling wellbore core samples Technical Field

[0001] This utility model relates to the field of filter technology, specifically to a replaceable filter for a drilling core sampler. Background Technology

[0002] The core sampler is a key piece of equipment for obtaining formation cores in oil and gas exploration. Its filter plays an important role in separating drilling fluid impurities and protecting the hydraulic system.

[0003] When drilling-type core extractors operate in high-pressure and highly corrosive downhole environments, the filters must withstand the continuous scouring of drilling fluid and the frequent impact of rock cuttings, leading to frequent problems such as filter element clogging and seal failure. Traditional filters generally use a structure that bolts to fix the filter element to the shell, and the entire filter assembly must be disassembled when replacing it. The operation process is cumbersome and time-consuming, which seriously affects the efficiency of core extraction operations. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides an easy-to-replace filter for drilling-type core samplers. It solves the problem that traditional filters generally use bolts to fix the filter element to the outer shell, requiring the entire filter assembly to be disassembled for replacement, which is cumbersome, time-consuming, and seriously affects the efficiency of core sampling operations.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a replaceable core feeder filter for drilling wells, comprising two filter housings, which are arranged vertically opposite each other, and two arc-shaped mounting grooves are provided on the inner walls of the two filter housings.

[0006] The fixing component is set in four arc-shaped mounting slots and two upper filter housings. The fixing component includes two mounting sleeves. The upper and lower surfaces of the two mounting sleeves are respectively snapped into the inner walls of the corresponding arc-shaped mounting slots. External connecting pipes are fixedly connected to the opposite surfaces of the two mounting sleeves.

[0007] The two external connecting pipes are inserted into the inner wall of the corresponding mounting sleeve at opposite ends, and the upper and lower surfaces of the two external connecting pipes are fixedly connected with the first support plate.

[0008] Each of the four first support plates has a circular placement sleeve fixedly connected to the end furthest from the external connecting pipe.

[0009] Preferably, each of the two filter housings has two mounting holes on its opposite surfaces, and the four mounting holes are respectively connected to the corresponding arc-shaped mounting grooves;

[0010] Each of the two mounting sleeves has a mounting rod fixedly connected to its upper and lower surfaces, and the ends of the four mounting rods that are away from the mounting sleeves slide through the inner walls of the corresponding mounting holes.

[0011] Preferably, each of the four mounting rods has a through hole, and a filter element is provided on the opposite side of the two mounting sleeves;

[0012] The filter element is fitted into the inner wall of the corresponding mounting sleeve at both ends, and a sealing ring is provided at the connection between the mounting sleeve and the two mounting sleeves.

[0013] Preferably, each of the two opposing surfaces of the filter housings is fixedly connected to two second support plates, and each of the four second support plates is fixedly connected to a circular fixing sleeve at the end away from the filter housing.

[0014] Preferably, two protective boxes are fixedly connected to the opposite surfaces of the two filter housings, and a cylinder is fixedly installed inside each of the two protective boxes;

[0015] The telescopic ends of the four cylinders slide through the outer surface of the corresponding protective box, and each of the four cylinders is fixedly connected to a fixing rod.

[0016] Preferably, the ends of the four fixing rods away from the cylinder extension end slide through the inner wall of the corresponding circular fixing sleeve and are engaged in the inner wall of the corresponding circular placement sleeve.

[0017] Preferably, two sealing grooves are formed on the upper surface of the lower filter housing, and two sealing plates are fixedly connected to the lower surface of the upper filter housing;

[0018] The lower ends of the two sealing plates are respectively engaged into the inner walls of the corresponding sealing grooves.

[0019] Compared with the prior art, this utility model provides an easy-to-replace filter for drilling-type core samplers, which has the following advantages:

[0020] 1. This easily replaceable core feeder filter for drilling uses a "cylinder-driven snap-fit ​​- arc groove positioning" design to achieve rapid replacement and stable fixation of the filter element, solving the problems of cumbersome replacement and sealing failure of traditional filters. The automated cylinder operation reduces manual intervention and adapts to the harsh environment in drilling operations. The cooperation between the sealing plate and the sealing groove effectively prevents drilling fluid leakage, improving the operating efficiency and reliability of the core feeder.

[0021] 2. This easily replaceable core feeder filter has an external connecting pipe that is connected to a circular placement sleeve and a fixing rod via a support plate. This not only improves the stability of the external connecting pipe during operation but also indirectly strengthens the connection between the filter housing and the mounting sleeve, thereby improving the overall stability after fixing. Attached Figure Description

[0022] Figure 1 is a schematic diagram of the overall structure of the easily replaceable core feeder filter of this utility model.

[0023] Figure 2 is a schematic diagram showing the location of the mounting holes in this utility model;

[0024] Figure 3 is a schematic diagram of the connection between the mounting rod and the mounting sleeve of this utility model;

[0025] Figure 4 is a schematic diagram of the location of the sealing groove of this utility model.

[0026] In the diagram: 1. Filter housing; 2. Protective box; 3. Circular fixing sleeve; 4. Mounting rod; 5. External connecting pipe; 6. First support plate; 7. Circular placement sleeve; 8. Second support plate; 9. Through hole; 10. Mounting hole; 11. Mounting sleeve; 12. Sealing groove; 13. Filter element; 14. Fixing rod; 15. Cylinder; 16. Arc-shaped mounting groove; 17. Sealing plate. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please refer to Figures 1-4. This utility model provides a new technical solution: a replaceable core feeder filter for drilling wells, including two filter housings 1, which are arranged vertically and vertically. Each of the two filter housings 1 has two arc-shaped mounting grooves 16 on its inner wall. A fixing component is provided on the four arc-shaped mounting grooves 16 and the two filter housings 1. The fixing component includes two mounting sleeves 11, the upper and lower surfaces of which are respectively engaged in the inner wall of the corresponding arc-shaped mounting grooves 16. External connecting pipes 5 are fixedly connected to the opposite surfaces of the two mounting sleeves 11.

[0029] Among them, the opposite ends of the two external connecting pipes 5 respectively penetrate into the inner wall of the corresponding mounting sleeve 11, and the upper and lower surfaces of the two external connecting pipes 5 are fixedly connected with the first support plate 6.

[0030] Among them, the ends of the four first support plates 6 that are away from the external connecting pipe 5 are all fixedly connected with circular placement sleeves 7.

[0031] Furthermore, two mounting holes 10 are provided on the opposite surfaces of the two filter housings 1, and the four mounting holes 10 are respectively connected to the corresponding arc-shaped mounting grooves 16;

[0032] Among them, the upper and lower surfaces of the two mounting sleeves 11 are fixedly connected with mounting rods 4, and the ends of the four mounting rods 4 away from the mounting sleeves 11 slide through the inner walls of the corresponding mounting holes 10.

[0033] Furthermore, each of the four mounting rods 4 has a through hole 9, and the two mounting sleeves 11 have filter elements 13 on their opposite sides;

[0034] The filter element 13 is inserted into the inner wall of the corresponding mounting sleeve 11 at both ends, and a sealing ring is provided at the connection between the mounting sleeve and the two mounting sleeves 11.

[0035] Furthermore, two second support plates 8 are fixedly connected to the opposite surfaces of the two filter housings 1, and a circular fixing sleeve 3 is fixedly connected to the end of each of the four second support plates 8 away from the filter housing 1.

[0036] Furthermore, two protective boxes 2 are fixedly connected to the opposite sides of the two filter housings 1, and cylinders 15 are fixedly installed inside the two protective boxes 2.

[0037] The telescopic ends of the four cylinders 15 slide through the outer surface of the corresponding protective box 2, and each of the telescopic ends of the four cylinders 15 is fixedly connected to a fixing rod 14.

[0038] Furthermore, the ends of the four fixing rods 14 that are away from the telescopic end of the cylinder 15 slide through the inner wall of the corresponding circular fixing sleeve 3 and are engaged in the inner wall of the corresponding circular placement sleeve 7.

[0039] Furthermore, two sealing grooves 12 are provided on the upper surface of the lower filter housing 1, and two sealing plates 17 are fixedly connected to the lower surface of the upper filter housing 1.

[0040] The lower ends of the two sealing plates 17 are respectively engaged into the inner walls of the corresponding sealing grooves 12.

[0041] Furthermore, when using this easily replaceable drilling core filter, first fix the two mounting sleeves 11 to the front and rear ends of the filter element 13, then take out the mounting sleeve 11 located below, place the lower ends of the two mounting sleeves 11 inside the two arc-shaped mounting grooves 16, and make the two mounting rods 4 pass through the inner wall of the corresponding mounting holes 10, so that the two through holes 9 and the two circular placement sleeves 7 are parallel;

[0042] Then, the two cylinders 15 located below are activated to push the two fixing rods 14 to move to opposite positions. After the fixing rods 14 pass through the circular fixing sleeve 3, they are engaged in the inner wall of the circular placement sleeve 7. The thrust of the cylinders 15 tightly fixes the mounting sleeve 11 in the arc-shaped mounting groove 16, so that the lower end of the filter element 13 is fixedly connected to the lower filter housing 1.

[0043] Similarly, the same operation is performed on the upper filter housing 1, so that the upper end of the filter element 13 is fixed by the cooperation of the mounting sleeve 11 and the cylinder 15, and at the same time, the sealing plate 17 of the upper filter housing 1 is engaged into the sealing groove 12 of the lower filter housing 1, forming a double sealing structure to prevent drilling fluid leakage.

[0044] When the filter element 13 needs to be replaced, simply reverse the cylinder 15 to retract the fixing rod 14 and disengage it from the circular placement sleeve 7, and the mounting sleeve 11 can be removed from the arc-shaped mounting groove 16 without disassembling the entire filter housing 1, thus achieving quick replacement of the filter element 13. The snap-fit ​​design between the mounting sleeve 11 and the filter element 13, and the elastic deformation compensation of the sealing ring, ensure the sealing performance and structural stability of the connection, adapting to the high-pressure environment during the drilling process.

[0045] The external connecting pipe 5 is connected to the circular placement sleeve 7 and the fixing rod 14 through the first support plate 6, which can not only improve the stability of the external connecting pipe 5 during operation, but also indirectly strengthen the connection between the filter housing 1 and the mounting sleeve 11, thereby improving the overall stability after fixing.

[0046] The design of "cylinder-driven snap-fit ​​- arc groove positioning" enables the rapid replacement and stable fixation of filter element 13, solving the problems of cumbersome replacement and sealing failure of traditional filters. The automated operation of the cylinder reduces manual intervention and adapts to the harsh environment in drilling operations. The cooperation between sealing plate 17 and sealing groove 12 effectively prevents drilling fluid leakage and improves the operating efficiency and reliability of the core sampler.

[0047] Structural Description: Filter housing 1: The main frame is set at the top and bottom, and is made of high pressure resistant alloy material (such as 316L stainless steel, pressure ≥30MPa). The inner wall has an arc-shaped mounting groove 16 for fixing the mounting sleeve 11. The outer wall has mounting holes 10, sealing grooves 12 and other structures to provide installation space and sealing interface for the filter element 13.

[0048] Sealing groove 12: It is opened on the upper surface of the lower filter housing 1, with a depth of 8-12mm, and is engaged with the sealing plate 17 of the upper filter housing 1 to form a double sealing structure with concave and convex fit (sealing pressure ≥5MPa) to prevent drilling fluid from leaking from the connection between the upper and lower housings.

[0049] Sealing plate 17: Fixed to the lower surface of the upper filter housing 1, made of nitrile rubber (NBR), with the lower end embedded in the sealing groove 12, and compensates for housing assembly errors through elastic deformation (allowing axial deviation ≤0.5mm), thereby improving sealing reliability.

[0050] Mounting sleeve 11: It is snapped onto the front and rear ends of the filter element 13, and the upper and lower surfaces are embedded in the arc-shaped mounting groove 16 of the filter housing 1 (fitting gap ≤ 0.2mm). It is made of hard alloy (hardness HRC60-65). The inner wall is provided with an annular groove to fix the filter element, and the outer wall is fixed in conjunction with the cylinder 15 through the mounting rod 4.

[0051] Mounting rod 4: Fixed to the upper and lower surfaces of mounting sleeve 11, it passes through the mounting hole 10 of filter housing 1 and protrudes outward. The rod body has a through hole 9 for snapping the fixing rod 14, so as to achieve mechanical locking between the mounting sleeve and the housing (tensile strength ≥50kN).

[0052] Through hole 9: A cylindrical hole (12mm in diameter) that passes through the mounting rod 4 and engages with the end of the fixing rod 14 (engagement depth ≥15mm). The mounting sleeve 11 is pressed into the arc-shaped mounting groove 16 by the thrust of the cylinder 15, thus forming an axial fixation.

[0053] Filter element 13: Installed between two mounting sleeves 11, it adopts a multi-layer metal mesh sintered structure (filtration accuracy 20-100μm), and the front and rear ends are snapped into the annular grooves on the inner wall of the mounting sleeve. It filters rock cuttings and impurities in drilling fluid and can withstand pressure difference ≥10MPa.

[0054] Cylinder 15: A double-acting cylinder (50mm diameter, 30mm stroke) fixed inside the protective box 2, with a working pressure of 0.6-1.0MPa. The telescopic end is connected to the fixing rod 14, and the fixing rod is quickly engaged and disengaged by air pressure (response time ≤0.5s).

[0055] Fixed rod 14: One end is fixed to the telescopic end of cylinder 15, and the other end is a T-shaped structure (head width 20mm). After passing through the circular fixed sleeve 3, it is inserted into the inner wall of the circular placement sleeve 7 to provide radial fixing force (the load-bearing capacity of a single fixed rod is ≥2kN) to ensure that the mounting sleeve 11 does not loosen under high pressure.

[0056] Protective housing 2: Fixed to the outer surface of filter housing 1, made of cast aluminum (ZL104), housing cylinder 15 inside, with through holes on the outside for fixing rod 14 to extend out, with a protection level of IP67, to prevent drilling fluid from entering the cylinder.

[0057] Circular fixing sleeve 3: Fixed to the end of the second support plate 8, with an inner diameter matching the fixing rod 14 (gap 0.5-1mm), providing sliding guidance for the fixing rod, ensuring coaxiality during snap-fit ​​(deviation ≤0.3mm), and improving fixing reliability.

[0058] The second support plate 8 is fixed to the outer surface of the filter housing 1, and the end is connected to the circular fixing sleeve 3. The material is Q345B steel with a thickness of 10mm. It enhances the installation rigidity of the circular fixing sleeve and disperses the axial load of the fixing rod.

[0059] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A replaceable filter for a drilling-type core sampler, characterized in that, include: Two filter housings (1) are arranged vertically and vertically, and two arc-shaped mounting grooves (16) are opened on the inner walls of the two filter housings (1). A fixing component is set on the four arc-shaped mounting grooves (16) and the two filter housings (1). The fixing component includes two mounting sleeves (11). The upper and lower surfaces of the two mounting sleeves (11) are respectively snapped into the inner walls of the corresponding arc-shaped mounting grooves (16). External connecting pipes (5) are fixedly connected to the opposite surfaces of the two mounting sleeves (11). The opposite ends of the two external connecting pipes (5) are respectively inserted into the inner walls of the corresponding mounting sleeves (11). The upper and lower surfaces of the two external connecting pipes (5) are fixedly connected to the first support plate (6). Circular placement sleeves (7) are fixedly connected to the ends of the four first support plates (6) away from the external connecting pipes (5).

2. The easily replaceable core sampler filter for drilling wellbore according to claim 1, characterized in that: Two mounting holes (10) are provided on the opposite surfaces of the two filter housings (1), and the four mounting holes (10) are respectively connected to the corresponding arc-shaped mounting grooves (16); wherein, the upper and lower surfaces of the two mounting sleeves (11) are fixedly connected with mounting rods (4), and the ends of the four mounting rods (4) away from the mounting sleeves (11) slide through the inner wall of the corresponding mounting holes (10).

3. The easily replaceable filter for a drilling-type core sampler according to claim 2, characterized in that: Each of the four mounting rods (4) has a through hole (9), and a filter element (13) is provided on the opposite side of the two mounting sleeves (11); wherein, the front and rear ends of the filter element (13) are respectively inserted into the inner wall of the corresponding mounting sleeve (11), and a sealing ring is provided at the connection between the mounting sleeve and the two mounting sleeves (11).

4. The easily replaceable core sampler filter for drilling wellbore according to claim 1, characterized in that: Two second support plates (8) are fixedly connected to the opposite surfaces of the two filter housings (1), and a circular fixing sleeve (3) is fixedly connected to one end of each of the four second support plates (8) away from the filter housing (1).

5. A replaceable core sampler filter for drilling wellbore according to claim 1, characterized in that: Two protective boxes (2) are fixedly connected to the opposite surfaces of the two filter housings (1), and cylinders (15) are fixedly installed inside the two protective boxes (2); wherein, the telescopic ends of the four cylinders (15) slide through the outer surface of the corresponding protective box (2), and the telescopic ends of the four cylinders (15) are fixedly connected to the fixing rods (14).

6. A replaceable core sampler filter for drilling wellbore according to claim 5, characterized in that: The ends of the four fixed rods (14) away from the telescopic end of the cylinder (15) slide through the inner wall of the corresponding circular fixed sleeve (3) and are engaged in the inner wall of the corresponding circular placement sleeve (7).

7. A replaceable core sampler filter for drilling wellbore as described in claim 1, characterized in that: Two sealing grooves (12) are provided on the upper surface of the filter housing (1) below, and two sealing plates (17) are fixedly connected to the lower surface of the filter housing (1) above; wherein the lower ends of the two sealing plates (17) are respectively engaged into the inner wall of the corresponding sealing groove (12).

Images