A drill string filter device and its assembly method

Abstract

This invention discloses a drill string filtering device and its assembly method, relating to the field of drill string technology. The device includes: an upper connector; a middle connector, the upper end of which is fixedly connected to the upper connector; a filter tube fixed inside the middle connector, the filter tube having multiple filter holes on its sidewall, and an annular gap between the inner wall of the middle connector and the filter tube; a slag-collecting plate, the slag-collecting plate having multiple slag-collecting holes, and the slag-collecting plate being located at the end of the filter tube furthest from the upper connector; and a lower connector fixed to the end of the middle connector furthest from the upper connector, the end of the lower connector furthest from the middle connector being used to connect to a bottom hole drilling tool assembly. This invention can effectively filter out iron filings or other impurities from the drill pipe, thereby effectively protecting the drill string and extending its service life.

Description

Technical Field

[0001] This invention relates to the field of drilling tool technology, and in particular to a drilling tool filtering device and its assembly method. Background Technology

[0002] When using high-pressure air or mud circulation drilling, the bottom drilling tools and instruments are often blocked or damaged due to iron filings on the inner wall of the drill bit, debris falling from the borehole opening, or excessive impurities in the mud (air). In addition, during the drilling process, blockage of the bottom drilling tools often results in a certain delay in the pressure reading on the ground. This means that if operators are not careful, they may damage weak points such as mud pipelines and air hoses on the ground. This can damage equipment or, in severe cases, endanger personal safety and cause major safety accidents.

[0003] To solve the above problems, when using high-pressure air or mud positive circulation drilling, the drill rod and drill tool are usually first struck with a heavy object and then blown clean with air before being lowered into the hole. However, this operation often fails to clean the internal deposits, iron filings and other impurities of the drill rod and drill tool.

[0004] To prevent this phenomenon, there are also filter screens on the market that are used in mud circulation drilling. However, these filter screens have a simple structure and low strength, and cannot withstand high pressure and vibration impact. Their performance is not always ideal, and they often cause blockage in the drill bit's inner hole after being damaged.

[0005] Therefore, there is an urgent need in the market for a drill bit filtering device and its assembly method to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a drill bit filtering device and its assembly method to solve the technical problems existing in the prior art. It can effectively filter out impurities such as drill rods, attachments inside the drill bit, and iron filings, thereby extending the service life of the drill bit.

[0007] To achieve the above objectives, the present invention provides the following solution:

[0008] This invention discloses a drill string filtration device, comprising:

[0009] Top connector;

[0010] A middle connector, the upper end of which is fixedly connected to the upper connector;

[0011] A filter tube is fixed inside the central connector. The filter tube has multiple filter holes on its side wall, and there is an annular gap between the inner wall of the central connector and the filter tube.

[0012] A slag-collecting plate, wherein the slag-collecting plate is provided with a plurality of slag-collecting holes, and the slag-collecting plate is disposed at the end of the filter tube away from the upper connector;

[0013] The lower connector is fixed to the end of the middle connector away from the upper connector, and the end of the lower connector away from the middle connector is used to connect to the bottom hole drilling tool assembly.

[0014] Preferably, an upper guide sleeve is fixedly connected to one end of the middle connector near the upper connector;

[0015] A lower guide sleeve is fixedly connected to one end of the middle connector near the lower connector.

[0016] Preferably, an upper adjusting washer is provided between the upper guide sleeve and the upper connector;

[0017] A lower adjusting washer is provided between the lower guide sleeve and the lower connector.

[0018] Preferably, the lower guide sleeve has a plurality of discharge holes on its side wall, and the discharge holes are connected to the annular gap.

[0019] Preferably, the lower guide sleeve has a plurality of oblique holes on its side wall, and the oblique holes are connected to the annular gap.

[0020] Preferably, the filter tube is divided into a porous section and a sealed section, and the filter holes are disposed on the porous section.

[0021] The present invention also discloses a method for assembling a drill string filter device, comprising the following steps:

[0022] S1. Connect the upper guide sleeve and the lower guide sleeve to both ends of the filter tube by thread;

[0023] S2. Then, use electric welding technology to weld the upper guide sleeve and the lower guide sleeve to both ends of the filter tube respectively;

[0024] S3. Insert the filter tube into the connector;

[0025] S4. Install the upper connector on the upper guide sleeve and the lower connector on the lower guide sleeve.

[0026] Preferably, in step S4, an upper adjusting washer is installed between the upper guide sleeve and the upper connector, and a lower adjusting washer is installed between the lower guide sleeve and the lower connector.

[0027] The present invention achieves the following technical effects compared to the prior art:

[0028] This invention utilizes a filter pipe and a slag-collecting plate to effectively filter out impurities from the drill pipe, preventing them from entering the bottom hole drilling tool assembly, thereby extending the service life of the bottom hole drilling tool assembly.

[0029] Furthermore, the present invention has a simple structure and can be directly installed on the upper end of the bottom hole drilling tool assembly that needs protection, thereby achieving the protection effect.

[0030] Furthermore, the present invention is applicable to air drilling and mud drilling, and has good applicability and versatility;

[0031] Furthermore, the present invention has a simple structure, few parts, is easy to install, reliable in use, and low in cost;

[0032] Furthermore, this invention is connected to the upper part of the bottom hole drilling tool assembly, and can be used directly as a drill collar when there is no sediment or no need for filtration, so as to pressurize the drill tool and effectively protect the verticality of the borehole.

[0033] Furthermore, the present invention makes it easy to remove sediment. Simply use high-pressure water or air to blow it directly into one end of the lower connector to remove the sediment, and pour it out from the upper connector. It can even be knocked out, making cleaning quick and convenient.

[0034] Furthermore, the lower guide sleeve of the present invention has an inclined hole drilled on it, which will not cause a large amount of small particles of sediment to accumulate. This can effectively prevent some sediment from blocking the annular gap, and also prevent both air intake and mud channels from being blocked, thus affecting normal drilling.

[0035] Furthermore, the design dimensions and outer diameter of this invention can be changed according to actual needs, making it widely applicable. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the drill bit filtering device in Example 1;

[0038] Figure 2 This is a front view of the slag-collecting plate in the drill string filtration device of Example 1;

[0039] Figure 3 This is a side view of the slag-collecting plate in the drill string filtration device of Example 1;

[0040] Figure 4 This is a schematic diagram of the upper guide sleeve in the drill bit filtering device of Embodiment 1;

[0041] Figure 5 This is a schematic diagram of the lower guide sleeve in the drill bit filter device of Embodiment 1;

[0042] Figure 6 This is a schematic diagram of the filter tube in the drill bit filtration device of Example 1;

[0043] Figure 7 This is a schematic diagram of the filter tube in the drill bit filtration device of Example 2;

[0044] In the diagram: 1-Upper connector; 2-Upper adjusting washer; 3-Upper guide sleeve; 4-Middle connector; 5-Filter tube; 501-Porous section; 502-Sealing section; 6-Slag receiving plate; 7-Lower guide sleeve; 8-Lower adjusting washer; 9-Lower connector; 10-Bottom hole drilling tool assembly. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] The purpose of this invention is to provide a drill bit filtering device and its assembly method to solve the technical problems existing in the prior art. It can effectively filter out impurities such as drill rods, attachments inside the drill bit, and iron filings, thereby extending the service life of the drill bit.

[0047] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] Example 1

[0049] like Figures 1-6 As shown, this embodiment provides a drill bit filtering device, including:

[0050] Upper connector 1, the upper end of which (the first end away from the middle connector 4) is used to connect the drill pipe or drill collar. In addition, the upper connector 1 is a tubular connector, and the central channel of the upper connector 1 is connected to the central channel of the drill pipe or drill collar.

[0051] The middle connector 4 is fixedly connected to the upper connector 1 at its upper end. The middle connector 4 is also a tubular structure, and its central through hole is connected to the central through hole of the upper connector 1.

[0052] Filter tube 5, its structure is as follows Figure 6 As shown, the filter tube 5 is a tubular structure. The filter tube 5 is fixed inside the middle connector 4. Multiple filter holes are provided on the side wall of the filter tube 5. There is an annular gap between the inner wall of the middle connector 4 and the outer wall of the filter tube 5.

[0053] Slag-collecting plate 6, its structure is as follows Figures 2-3 As shown, the slag receiving plate 6 is provided with multiple slag receiving holes. The slag receiving plate 6 is located at the end of the filter tube 5 away from the upper connector 1. The diameter of the slag receiving holes and the filter holes needs to be designed according to the diameter of the impurity particles that need to be filtered.

[0054] The lower connector 9 is fixed to the end of the middle connector 4 away from the upper connector 1. The end of the lower connector 9 away from the middle connector 4 is used to connect to the bottom hole drilling tool assembly 10. The lower connector 9 is also a tubular structure, and its central channel is connected to the central channels of the upper connector 1 and the middle connector 4. The upper connector 1 and the lower connector 9 are used to position the filter tube 5, which can effectively prevent the filter tube 5 from being damaged by vibration and impact, making it sturdy and durable.

[0055] In actual use, the lower connector 9 is connected to the drilling tool assembly, and the upper connector 1 is directly connected to the drill collar or drill rod to complete the installation. During positive circulation drilling, high-pressure mud or high-pressure air enters the central channel of the upper connector 1 through the central channel of the upper drill rod or drill collar. If there are no iron filings or impurities falling, most of the high-pressure mud or air will follow the original travel path through the slag-collecting hole on the slag-collecting plate 6 and enter the bottom hole drilling tool assembly 10 below, enabling it to work normally and achieve drilling. If there is some sediment formed by iron filings or impurities, the mud or air will change its travel path in time, pass through the filter hole on the filter pipe 5, enter the annular gap between the outer wall of the filter pipe 5 and the inner wall of the middle connector 4, descend along the annular gap, and flow into the central channel of the lower connector 9, and finally enter the bottom hole drilling tool assembly 10 below to achieve normal drilling.

[0056] In addition, it should be noted that if severe sediment is found, two more sets of drilling tool filtration devices can be installed at different parts of the drilling tool and drill rod to achieve one, two or more filtrations without affecting the entire drilling tool assembly. This can effectively protect the bottom hole drilling tool assembly 10 and extend its service life.

[0057] In this embodiment, an upper guide sleeve 3 is fixedly connected to one end of the middle connector 4 near the upper connector 1. The structure of the upper guide sleeve 3 is as follows: Figure 4 As shown, its lower end has a tapered structure, which is intended to fit with the tapered hole at the upper end of the middle connector 4. In addition, it also has a central channel, which can be connected to the central channels of the upper connector 1 and the middle connector 4.

[0058] A lower guide sleeve 7 is fixedly connected to one end of the middle connector 4 near the lower connector 9. The structure of the lower guide sleeve 7 is as follows: Figure 5 As shown, its upper end is provided with a groove that is compatible with the slag receiving plate 6, and its center is also provided with a central channel that connects to the middle connector 4 and the lower connector 9.

[0059] The function of the upper guide sleeve 3 and the lower guide sleeve 7 is to achieve rapid alignment of the upper connector 1, the middle connector 4 and the lower connector 9, and to ensure concentricity of the upper connector 1, the middle connector 4 and the lower connector 9.

[0060] In this embodiment, an upper adjusting washer 2 is provided between the upper guide sleeve 3 and the upper connector 1;

[0061] A lower adjusting washer 8 is provided between the lower guide sleeve 7 and the lower connector 9.

[0062] The purpose of setting the upper adjusting washer 2 and the lower adjusting washer 8 is to prevent the filter tube 5 from moving axially.

[0063] In this embodiment, the lower guide sleeve 7 has several discharge holes on its side wall, which are connected to the annular gap. Impurities entering the annular gap from the filter holes will flow into the central channel of the lower connector 9 through the discharge holes.

[0064] In this embodiment, the lower guide sleeve 7 has several oblique holes on its side wall, which are connected to the annular gap. The purpose of setting the oblique holes is to prevent the accumulation of a large amount of small particle sediment and to effectively prevent some sediment from clogging the annular gap.

[0065] In this embodiment, the sidewalls of the filter tube 5 are all provided with filter holes, and multiple layers of filter holes are arranged. The spacing between adjacent layers of filter holes is the same, and each layer includes a number of filter holes, which are distributed along the circumference of the filter tube 5. In addition, adjacent layers of filter holes are staggered, which can effectively improve the overall strength of the filter tube 5. This type of filter tube 5 is mostly suitable for filtering large particles of impurities. Large particles of impurities can be effectively isolated by the filter holes inside the filter tube 5, while mud or air can pass through the filter holes and flow into the annular gap.

[0066] Example 2

[0067] like Figure 7 As shown, this embodiment provides a drill bit filtering device, whose structure is basically the same as the technical features provided in Embodiment 1, the difference being:

[0068] In this embodiment, the filter tube 5 is divided into a porous section 501 and a sealed section 502. The filter holes are all located on the porous section, while the sealed section 502 has no filter holes and is a fully enclosed structure. During actual installation, the porous section 501 is positioned closer to the upper connector 1 than the sealed section 502. This type of filter tube 5 is primarily suitable for filtering small particulate impurities. In actual use, when mud or air enters the filter tube 5, the sealed section 502 is specifically designed to prevent smaller particulate impurities from passing through the filter holes. This structure effectively allows small particulate impurities to accumulate at the sealed section 502, preventing a large amount of small particulate impurities from passing through the filter holes.

[0069] Example 3

[0070] This embodiment provides a method for assembling a drill string filter device, including the following steps:

[0071] S1. The upper guide sleeve 3 and the lower guide sleeve 7 are respectively connected to the two ends of the filter tube 5 by threads. Specifically, the two ends of the filter tube 5 are respectively provided with external threads, and the lower guide sleeve 7 and the upper guide sleeve 3 are both provided with internal threads, so as to achieve threaded connection.

[0072] S2. In order to prevent the threaded connection in step S1 from being too loose, the upper guide sleeve 3 and the lower guide sleeve 7 are welded to both ends of the filter tube 5 using electric welding technology.

[0073] S3. Insert the filter tube 5, the upper guide sleeve 3, and the lower guide sleeve 7 into the middle connector 4;

[0074] S4. Install the upper connector 1 on the upper guide sleeve 3 and the lower connector 9 on the lower guide sleeve 7 to achieve the positioning of the filter tube 5.

[0075] In this embodiment, in step S4, an upper adjusting washer 2 is installed between the upper guide sleeve 3 and the upper connector 1, and a lower adjusting washer 8 is installed between the lower guide sleeve 7 and the lower connector 9, so as to prevent the filter tube 5 from moving axially.

[0076] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A drilling tool filtration device, characterized by, The utility model relates to a filter pipe for slag ladle, comprising: an upper joint; a middle joint, the upper end of which is fixedly connected with the upper joint; a filter pipe, which is fixed in the middle joint, the side wall of the filter pipe being provided with a plurality of filter holes, and the inner wall of the middle joint and the filter pipe having an annular gap therebetween; a slag receiving plate, which is provided with a plurality of slag receiving holes, and is arranged at the end of the filter pipe away from the upper joint; a lower joint, which is fixed at the end of the middle joint away from the upper joint, and the end of the lower joint away from the middle joint being used for connecting a hole bottom drilling tool instrument assembly; an upper guide sleeve is fixedly connected at the end of the middle joint close to the upper joint; and a lower guide sleeve is fixedly connected at the end of the middle joint close to the lower joint; a plurality of inclined holes are arranged on the side wall of the lower guide sleeve, and the inclined holes are communicated with the annular gap; 2. The drilling rig filtration apparatus of claim 1, wherein: the filter pipe is divided into a porous section and a sealed section, and the filter holes are arranged on the porous section. an upper adjusting gasket is arranged between the upper guide sleeve and the upper joint; 3. The drilling rig filtration apparatus of claim 1, wherein: a lower adjusting gasket is arranged between the lower guide sleeve and the lower joint.

4. A method of assembling a drilling tool filter device according to any one of claims 1-3, characterized in that, a plurality of discharge holes are arranged on the side wall of the lower guide sleeve, and the discharge holes are communicated with the annular gap. The utility model comprises the following steps: S1, the upper guide sleeve and the lower guide sleeve are respectively connected on both ends of the filter pipe through threads; S2, the upper guide sleeve and the lower guide sleeve are respectively welded with both ends of the filter pipe by using electric welding technology; S3, the filter pipe is inserted into the middle joint; 5. The method of assembling a drilling rig filtration apparatus of claim 4, wherein: S4, the upper joint is installed on the upper guide sleeve, and the lower joint is installed on the lower guide sleeve. In step S4, the upper adjusting gasket is arranged between the upper guide sleeve and the upper joint, and the lower adjusting gasket is arranged between the lower guide sleeve and the lower joint.

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