Wellbore magnetic cleaning tool for eliminating magnetic interference

Abstract

The application discloses a well bottom magnetic force cleaning tool capable of eliminating magnetic force interference, which comprises four parts of an upper drill pipe structure 1, an upper annular magnetic force area 2, a middle outer circle magnetic force area 3 and a lower end surface magnetic force area 4. A drill pipe joint thread is arranged in one end of the upper drill pipe structure to realize the connection with a drill pipe. Spiral righting rib belts are arranged at two ends of the upper annular magnetic force area, and rectangular magnets are arranged on the upper annular magnetic force area between the two spiral righting rib belts. The middle outer circle magnetic force area is provided with rectangular magnets around the middle outer circle magnetic force area. The lower end surface magnetic force area is provided with a plurality of magnets embedded in the end surface. The three-stage magnetic force structure can remove all magnetic materials remaining in the well wall, the well bottom, the mud and the annular space of the well bottom interference magnetic force exploration at one time. The magnetic force exploration is carried out on the basis of ensuring the well bottom cleaning, and the accuracy of the magnetic force exploration is ensured.

Description

Technical Field

[0001] This invention relates to the field of magnetic exploration equipment technology, specifically to a bottom-hole magnetic cleaning tool for eliminating magnetic interference. Background Technology

[0002] Magnetic exploration is one of the earliest developed and applied geophysical methods. More than two thousand years ago, our ancestors knew and utilized the iron-attracting and polarity-pointing properties of natural magnets. By observing and analyzing magnetic anomalies caused by differences in the magnetism of rocks, ores, or other objects being explored, they could study geological structures and detect mineral resources. In the field of oil and gas development, the seepage of hydrocarbons into the surface creates a reducing environment in oil and gas fields, which can reduce iron oxide in rocks or soil to magnetite. High-precision magnetometers can detect these magnetic anomalies, allowing them to be combined with other exploration methods to discover oil and gas fields.

[0003] Downhole magnetic logging is primarily used to solve geological problems at the well bottom, around the well, and surrounding the well. It is characterized by its portability, high efficiency, low cost, good performance in many cases, wide operating range, and lack of geographical limitations, making it widely applicable in drilling operations. With the development of modern science and technology and the emergence of technologies such as horizontal wells and multi-branch wells, the requirements for magnetic azimuth accuracy in measurement-while-drilling (MWD) technology are becoming increasingly stringent. Magnetic exploration instruments have evolved from mechanical to electronic types. Due to improved instrument accuracy, continuous improvement and updating of methods, and the ongoing development and refinement of interpretation theories, the application of magnetic exploration has become even broader.

[0004] However, as the accuracy of magnetic exploration instruments continues to improve, the cleanliness of the bottom of the well being probed has an increasingly significant impact on the exploration results. If magnetic materials are present in the probed area, it will greatly affect the results. Furthermore, the accuracy of magnetic exploration data directly affects subsequent drilling risks, drilling success rates, and wellbore trajectory adjustments.

[0005] The errors in this type of magnetic exploration data cannot meet the accuracy requirements of complex structures. With the emergence of directional wells such as horizontal wells and multi-branch wells, the harmfulness of these errors has become increasingly apparent: the surveying industry has increasingly higher demands for the accuracy of magnetic exploration, and there is an urgent need for methods to improve the accuracy of magnetic exploration in order to further enhance the precision of downhole information. Summary of the Invention

[0006] The purpose of this invention is to provide a bottom-hole magnetic cleaning tool that eliminates magnetic interference. Employing a three-stage magnetic structure, it can remove all residual magnetic materials from the wellbore, bottom, mud, and annulus that interfere with magnetic exploration in a single operation. This ensures that magnetic exploration is performed while maintaining a clean bottom, thereby guaranteeing the accuracy of magnetic exploration and overcoming the deficiencies and shortcomings described in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a bottom-of-well magnetic cleaning tool for eliminating magnetic interference, comprising:

[0008] Upper drill rod structure; one end of the upper drill rod structure is provided with an upper drill rod joint thread to achieve connection with the drill rod;

[0009] Upper annular magnetic field region; spiral straightening ribs are provided at both ends of the upper annular magnetic field region, and a rectangular magnet is provided on the upper annular magnetic field region between the two spiral straightening ribs;

[0010] A central outer circular magnetic field region; a rectangular magnet is arranged around the central outer circular magnetic field region;

[0011] The lower end face magnetic region; multiple magnets are embedded in the end face of the lower end face magnetic region.

[0012] As a further aspect of the present invention: a magnet embedding groove is provided on the upper annular magnetic region between the two spiral straightening ribs, and the magnet embedding groove is parallel to and offset from the corresponding rectangular magnet on the upper annular magnetic region.

[0013] As a further aspect of the present invention: the outer diameter of the spiral straightening rib is larger than the outer diameter of the magnetic cleaning tool; the spiral straightening rib, the magnet embedding groove, and the well wall form an annular storage space.

[0014] As a further aspect of the present invention: the rectangular magnet has shoulders at both ends, and a magnetic pressing block is provided at the corresponding position of the shoulder; the magnetic pressing block is embedded into the corresponding position of the magnetic cleaning tool by fasteners.

[0015] As a further embodiment of the present invention: a clamping plate is provided on one side of the magnet pressing block, the clamping plate is clamped to the corresponding shoulder, and a through connection hole is provided on the other side of the magnet pressing block; the through connection hole has a cross-sectional through groove structure or a clamping plate type through groove structure; the fastener is a screw connection, riveting or bonding.

[0016] As a further embodiment of the present invention: the magnet is a cylindrical structure, which is embedded in the end face of the magnetic field area at the lower end face and fixed by an end pressure plate.

[0017] As a further aspect of the present invention: water holes are provided on the central axis of the upper drill rod structure, the upper annular magnetic region, the middle outer circular magnetic region and the lower end face magnetic region, and all water holes are interconnected.

[0018] Compared with existing technologies, the beneficial effects of this invention are as follows: By comprehensively cleaning the magnetic materials present in the bottom-hole detection area, this invention eliminates interference from magnetic materials during magnetic exploration, greatly improving measurement accuracy. This provides accurate data and timely guidance for subsequent drilling parameter adjustments, effectively avoiding subsequent drilling risks. It plays a decisive role, especially in the precise exploration of horizontal wells and multi-branch wells. This invention employs a three-stage magnetic structure, which can remove all residual magnetic materials from the wellbore, bottom, mud, and annulus that interfere with magnetic exploration in one go. Magnetic exploration is conducted on the basis of a clean bottom, ensuring the accuracy of magnetic exploration. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 for Figure 1 BB section view;

[0022] Figure 3 for Figure 1 CC section view;

[0023] Figure 4 for Figure 1 DD section view;

[0024] Figure 5 This is a schematic diagram of the magnet pressing block structure in the present invention. Figure 1 ;

[0025] Figure 6 This is a schematic diagram of the magnet pressing block structure in the present invention. Figure 2

[0026] Figure 7 This is a schematic diagram of the rectangular magnet structure in this invention.

[0027] In the diagram: 1. Upper drill pipe structure; 2. Upper annular magnetic zone; 3. Middle outer circular magnetic zone; 4. Lower end face magnetic zone; 5. Spiral straightening rib; 6. Magnet embedding groove; 7. Rectangular magnet; 8. Magnet clamping block; 8.1. Clamping plate; 9. Fastener; 10. Shoulder; 11. Magnet; 12. End clamping plate; 13. Water eye hole; 14. Upper drill pipe joint thread. Detailed Implementation

[0028] 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.

[0029] Please see Figure 1-7 This embodiment provides a technical solution: a bottom-hole magnetic cleaning tool for eliminating magnetic interference, comprising four areas: an upper drill pipe structure 1, an upper annular magnetic area 2, a middle outer circular magnetic area 3, and a lower end-face magnetic area 4; the upper drill pipe structure 1 has an upper drill pipe joint thread 14 at one end for connection with the drill pipe; the upper annular magnetic area 2 has spiral straightening ribs 5 at both ends, and a rectangular magnet 7 is provided on the upper annular magnetic area 2 between the two spiral straightening ribs 5; a magnet embedding groove 6 is provided on the upper annular magnetic area 2 between the two spiral straightening ribs 5, and the magnet embedding groove 6 and the corresponding rectangular magnet 7 on the upper annular magnetic area 2 are parallel and staggered; the outer circle dimension of the spiral straightening rib 5 is larger than the outer circle dimension of the magnetic cleaning tool; the spiral straightening rib 5, the magnet embedding groove 6, and the well wall form an annular storage area. The space, under the attraction of the rectangular magnet 7, can adsorb and store large pieces of magnetic material flushed up by the mud circulation at the bottom of the well, achieving the effect of cleaning the mud and annulus; the central outer circular magnetic area 3 is surrounded by rectangular magnets 7, which are fixed in the outer circular groove by multiple rectangular magnets 7 with magnetic pressure blocks 8 and fasteners 9, which can adsorb small pieces of magnetic material on the well wall, achieving the effect of cleaning the well wall; the end face of the lower end face magnetic area 4 is embedded with multiple magnets 11, which can adsorb magnetic material at the bottom of the well, achieving the effect of cleaning the bottom of the well; the magnet 1 is a cylindrical structure, embedded in the end face of the lower end face magnetic area 4, and fixed by the end pressure plate 12; water holes 13 are provided on the central axis of the upper drill pipe structure 1, the upper annular magnetic area 2, the central outer circular magnetic area 3 and the lower end face magnetic area 4, and all water holes 13 are interconnected, which are used to realize large-volume mud circulation.

[0030] The rectangular magnet 7 has shoulders 10 at both ends, and a magnet pressing block 8 is provided at the corresponding position of the shoulder 10. The magnet pressing block 8 is embedded into the corresponding position on the magnetic cleaning tool by fasteners 9 to ensure a firm fit. A retaining plate 8.1 is provided on one side of the magnet pressing block 8, and the retaining plate 8.1 is locked to the corresponding shoulder 10. A through connection hole is provided on the other side of the magnet pressing block 8. The through connection hole has a through groove structure or a retaining plate type through groove structure. The fastener 9 is connected by screws, riveting, or bonding.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A magnetic cleaning tool for bottom wells to eliminate magnetic interference, characterized in that... include: Upper drill rod structure (1); one end of the upper drill rod structure (1) is provided with an upper drill rod joint thread (14) to achieve connection with the drill rod; Upper annular magnetic region (2); the upper annular magnetic region (2) is provided with spiral straightening ribs (5) at both ends, and a rectangular magnet (7) is provided on the upper annular magnetic region (2) between the two spiral straightening ribs (5); A central outer circular magnetic field region (3); a rectangular magnet (7) is arranged around the central outer circular magnetic field region (3); Lower end face magnetic region (4); multiple magnets (11) are embedded in the end face of the lower end face magnetic region (4); A magnet embedding groove (6) is provided on the upper annular magnetic region (2) between the two spiral straightening ribs (5). The magnet embedding groove (6) and the corresponding rectangular magnet (7) on the upper annular magnetic region (2) are parallel to each other and misaligned. The outer diameter of the spiral straightening rib (5) is larger than the outer diameter of the magnetic cleaning tool; the spiral straightening rib (5), the magnet embedding groove (6), and the well wall form an annular storage space; The rectangular magnet (7) has shoulders (10) at both ends, and a magnetic pressing block (8) is provided at the corresponding position of the shoulder (10); the magnetic pressing block (8) is embedded into the corresponding position of the magnetic cleaning tool by fasteners (9); A clamping plate (8.1) is provided on one side of the magnet pressing block (8), and the clamping plate (8.1) is clamped to the corresponding shoulder (10). A through connection hole is provided on the other side of the magnet pressing block (8). The through connection hole has a cross-sectional through groove structure or a clamping plate type through groove structure. The fastener (9) is a screw connection, riveting or bonding.

2. The well bottom magnetic cleaning tool for eliminating magnetic interference according to claim 1, characterized in that: The rectangular magnet (7) is a cylindrical structure, which is embedded in the end face of the magnetic field area (4) at the lower end face and fixed by the end pressure plate (12).

3. The well bottom magnetic cleaning tool for eliminating magnetic interference according to claim 1, characterized in that: Water holes (13) are provided on the central axis of the upper drill rod structure (1), the upper annular magnetic area (2), the middle outer circular magnetic area (3) and the lower end face magnetic area (4), and all water holes (13) are interconnected.

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