Underground magnetic drilling fluid filtering device

Abstract

The underground magnetic drilling fluid filtering device comprises an outer cylinder, openings are formed in the upper end and the lower end of the outer cylinder, the top end and the bottom end of the outer cylinder are in threaded connection with an upper drill rod connecting buckle and a lower drill rod connecting buckle respectively, an installation top plate is coaxially and fixedly installed at the top end of the outer cylinder, and a filtering assembly is fixedly installed at the bottom of the installation top plate. An annular space is formed between the outer wall of the filtering assembly and the inner wall of the outer cylinder, a magnet rod is fixedly installed in the center of the bottom of the installation top plate and installed in the filtering assembly, and a sealing base is fixedly installed at the bottom of the filtering assembly. The filtering effect of the filtering assembly can be changed according to different geological environments, and the device is compact in structure and convenient to mount and dismount, and facilitates cleaning of particle impurities.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of petroleum and natural gas engineering technology, concretely to a magnetic drilling fluid filter device for downhole. BACKGROUND

[0002] With the increasing strength of oil and gas resource exploration and development, oil and gas resource development has developed from shallow formation to deep formation, from land to ocean deep water and super deep water region, horizontal well, directional well and drilling in complex geological environment increase, downhole condition is increasingly complex, which puts forward higher requirements for measurement while drilling (abbreviation: MWD), logging while drilling (abbreviation: LWD) and drilling information transmission in downhole complex environment, drilling fluid is easy to mix with rock debris, iron filings and other particulate impurities, especially when steel tools or metal equipment are used, a large amount of magnetic particles such as iron filings are generated, these impurities not only cause equipment wear, block the drilling fluid circulation system, reduce the performance of drilling fluid, and even endanger the safety of downhole operation.

[0003] After retrieval, it is found that the prior art with publication number CN220185066U discloses a magnetic drilling fluid filter device for downhole, which comprises an outer cylinder and a filter element installed in the inner part of the outer cylinder, the filter element is sealingly connected with the outer cylinder at both ends, the filter element has a filter surface, an annular space is formed between the filter surface and the outer cylinder, the annular space is communicated with a shunt flow channel arranged on the upper part of the filter element, the outer cylinder has a liquid inlet hole and a liquid outlet hole, the liquid inlet hole is communicated with the shunt flow channel, the liquid outlet hole is communicated with a filtrate flow channel arranged in the inner part of the filter element, a magnet is further arranged in the annular space, the magnet is fixedly connected on the filter element and arranged in multiple layers along the length direction of the filter element, each layer of the magnet is arranged in multiple and arranged along the circumferential direction of the filter element, the utility model provides a magnetic drilling fluid filter device for downhole, which can filter and store foreign matter and impurities for a short period of time, and can effectively adsorb and store metal impurities such as iron filings for a short period of time, prevent the metal impurities from returning to the well with the drilling fluid and affecting the operation efficiency, and reduce the failure rate of downhole sensitive instruments.

[0004] Therefore, based on the above retrieval and combined with the existing technology, the existing magnetic drilling fluid filter device for downhole cannot adjust the filtering effect of the filtering assembly according to different geological environments, and is inconvenient to install and disassemble, not easy to install and disassemble the filtering assembly, and not easy to clean the particulate impurities. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a magnetic drilling fluid filter device for downhole to solve the problems in the above background technology.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] The utility model provides a kind of magnetic drilling fluid filter device for downhole, including outer tube, outer tube upper and lower end is equipped with opening, outer tube top and bottom two ends are respectively screw thread connection with upper drill rod connecting buckle and lower drill rod connecting buckle, outer tube top coaxially fixed installation has installation roof, installation roof bottom fixed installation has filter assembly, annular space is formed between the outer wall of filter assembly and the inner wall of outer tube, magnet rod is fixedly installed at the center of installation roof bottom, magnet rod is installed in filter assembly, filter assembly bottom fixed installation has sealing base.

[0008] Further, a plurality of shunt flow channels are equidistantly arranged on the top surface of the installation roof near the outer side circumference, and a pull ring is fixedly installed on the top surface of the installation roof.

[0009] Further, the filter assembly includes a fixed filter cartridge, the installation roof and the sealing base are respectively fixed at the top and bottom ends of the fixed filter cartridge, and the magnet rod is fixedly installed in the fixed filter cartridge.

[0010] Further, a plurality of filter holes one are equidistantly arranged on the outer wall of the fixed filter cartridge, and a set of limiting rings are symmetrically arranged on the upper and lower sides of the outer wall of the fixed filter cartridge.

[0011] Further, the rotating filter cartridge is rotatably connected to the outer wall of the fixed filter cartridge, and a plurality of filter holes two are equidistantly arranged on the outer wall of the rotating filter cartridge.

[0012] Further, an installation arm is integrally formed on the top end of the outer wall of the rotating filter cartridge, and a stepping motor is fixedly installed on the bottom surface of the end portion of the installation arm.

[0013] Further, a driving gear is coaxially connected to the rotating shaft of the stepping motor after passing through the installation arm, a gear ring is coaxially fixedly installed on the top end of the fixed filter cartridge, and the driving gear is in meshing transmission connection with the gear ring.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] 1、In the utility model for use, the driving gear is driven to rotate by the stepping motor, the driving gear is in meshing transmission connection with the gear ring, and the rotating filter cartridge is indirectly driven to rotate on the outer wall of the fixed filter cartridge, so as to change the pore size of the filter assembly, so that the filtering effect of the filter assembly can be changed according to different geological environments, the device has compact structure, is convenient to install and disassemble, and is convenient for cleaning particulate impurities. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the overall structure of the utility model Figure 1 ;

[0017] Figure 2 is the overall structure of the utility model Figure 2 ;

[0018] Figure 3The whole structure schematic diagram of the utility model;

[0019] Figure 4 The whole structure explosion map of the utility model;

[0020] Figure 5 The filter assembly structure explosion map of the utility model.

[0021] In the drawing: 1, outer cylinder;11, blocking block;2, upper drill rod connecting buckle;3, lower drill rod connecting buckle;4, installation top plate;41, pull ring;42, shunt flow channel;5, filter assembly;51, fixed filter cartridge;511, filter hole one;512, limiting ring;52, rotating filter cartridge;521, filter hole two;522, installation arm;53, stepping motor;531, driving gear;54, gear ring;6, annular space;7, magnet bar;8, sealing base;81, sealing ring. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0023] Embodiment 1: please refer to Figures 1-4 A magnetic drilling fluid filter device for downhole, including outer cylinder 1, the upper and lower ends of outer cylinder 1 are equipped with opening, outer cylinder 1 top and bottom two ends are respectively screwed with upper drill rod connecting buckle 2 and lower drill rod connecting buckle 3, specifically, the top and bottom of outer cylinder 1 are integrally formed with outer thread sleeve, upper drill rod connecting buckle 2 and lower drill rod connecting buckle 3 are respectively fixedly connected with two outer thread sleeves, outer cylinder 1 top end is coaxially fixedly installed with installation top plate 4, specifically, the inner wall of outer cylinder 1 top end is integrally formed with blocking block 11, the bottom of installation top plate 4 and the top surface of blocking block 11 abut, blocking block 11 has the limiting effect to installation top plate 4, so that installation top plate 4 is limitedly installed between the inner wall of outer cylinder 1, the bottom of installation top plate 4 is fixedly installed with filter assembly 5, annular space 6 is formed between the outer wall of filter assembly 5 and the inner wall of outer cylinder 1, specifically, annular space 6 is used to store larger diameter rock debris, iron filings and other particulate impurities, magnet bar 7 is fixedly installed at the center of the bottom of installation top plate 4, specifically, magnet bar 7 is used to adsorb small diameter iron filings and other magnetic particles, sealing base 8 is fixedly installed at the bottom of filter assembly 5, specifically, the outer wall of sealing base 8 abuts with the inner wall of outer cylinder 1, and sealing ring 81 is clamped between the outer wall of sealing base 8 and the inner wall of outer cylinder 1.

[0024] A plurality of shunt flow channels 42 are arranged equidistantly on the top surface of the mounting top plate 4 near the outer side circumference, specifically, the drilling fluid enters the annular space 6 through the shunt flow channels 42, and a pull ring 41 is fixedly arranged on the top surface of the mounting top plate 4, specifically, a fixing groove is integrally formed on the center of the top surface of the mounting top plate 4, and the pull ring 41 is inserted and fixed in the fixing groove.

[0025] Embodiment 2: please refer to Figures 4-5 A magnetic drilling fluid filtering device for downhole, which is different from the embodiment 1, the filtering assembly 5 comprises a fixed filter cartridge 51, the mounting top plate 4 and the sealing base 8 are fixed at the top and bottom ends of the fixed filter cartridge 51 respectively, specifically, the mounting top plate 4 and the sealing base 8 are connected with the fixed filter cartridge 51 through threads, the magnet rod 7 is fixedly arranged in the fixed filter cartridge 51, a plurality of filter holes one 511 are arranged equidistantly on the outer wall of the fixed filter cartridge 51, a set of limiting rings 512 are symmetrically arranged on the outer wall of the fixed filter cartridge 51, and a rotating filter cartridge 52 is limitingly arranged between the set of limiting rings 512, the rotating filter cartridge 52 is rotationally connected to the outer wall of the fixed filter cartridge 51, a plurality of filter holes two 521 are arranged equidistantly on the outer wall of the rotating filter cartridge 52, specifically, the plurality of filter holes two 521 have the same diameter as the plurality of filter holes one 511, and the plurality of filter holes two 521 correspond to the plurality of filter holes one 511.

[0026] An installation arm 522 is integrally formed on the top end of the outer wall of the rotating filter cartridge 52, a stepping motor 53 is fixedly arranged on the bottom surface of the end portion of the installation arm 522, specifically, the stepping motor 53 is waterproofed, a driving gear 531 is coaxially connected to the rotating shaft of the stepping motor 53 after penetrating through the installation arm 522, and a gear ring 54 is coaxially fixedly arranged on the top end of the fixed filter cartridge 51, and the driving gear 531 is in meshing transmission connection with the gear ring 54.

[0027] Working principle: the upper drill rod connecting buckle 2 is connected with the upper drill rod, the lower drill rod connecting buckle 3 is connected with the lower drill rod, the stepping motor 53 is started, the stepping motor 53 drives the driving gear 531 to rotate, the driving gear 531 is in meshing transmission connection with the gear ring 54, and the rotating filter cartridge 52 is indirectly driven to rotate on the outer wall of the fixed filter cartridge 51, so as to adjust the position of the filter holes two 521, when the filter holes one 511 coincide with the filter holes two 521, the maximum diameter of the particles that can pass through the filtering assembly 5, when the filter holes two 521 gradually stagger with the filter holes one 511, the diameter of the particles that can pass through the filtering assembly 5 gradually becomes smaller, until the filter holes one 511 are closed by the rotating filter cartridge 52, so as to change the aperture of the filtering assembly 5;

[0028] When the sensitive instrument is operated in the well, the drilling fluid in the upper drill pipe enters the annular space 6 through the shunt flow channel 42 of the installation top plate 4, and the large-diameter cuttings, iron filings and other particle impurities cannot pass through the filter assembly 5 and are stored in the annular space 6; the drilling fluid enters the fixed filter cartridge 51 through the filter assembly 5, and the small-diameter iron filings and other magnetic particles are adsorbed on the outer wall of the magnet rod 7; and the filtered drilling fluid finally flows out through the bottom of the outer cylinder 1 to the lower drill pipe.

[0029] When the sensitive instrument operation in the well is completed, the installation top plate 4 is pulled out of the outer cylinder 1 through the pull ring 41, the cuttings, iron filings and other particle impurities in the outer cylinder 1 are poured out, the filter assembly 5 is disassembled from the installation top plate 4, and the iron filings and other magnetic particles on the magnet rod 7 are cleaned; thus, the device is completed.

[0030] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A magnetic drilling fluid filter device for downhole use, comprising an outer cylinder (1), characterized in that: The upper and lower ends of the outer cylinder (1) are both provided with openings, and the upper and lower ends of the outer cylinder (1) are respectively threadedly connected with an upper drill rod connecting buckle (2) and a lower drill rod connecting buckle (3), a mounting top plate (4) is coaxially fixedly installed on the top of the outer cylinder (1), a filter assembly (5) is fixedly installed on the bottom of the mounting top plate (4), an annular space (6) is formed between the outer wall of the filter assembly (5) and the inner wall of the outer cylinder (1), a magnet rod (7) is fixedly installed at the center of the bottom of the mounting top plate (4), the magnet rod (7) is installed in the filter assembly (5), and a sealing base (8) is fixedly installed on the bottom of the filter assembly (5).

2. The downhole magnetic drilling fluid filter device according to claim 1, characterized in that: The top surface of the installation top plate (4) is provided with a plurality of diversion channels (42) at equal distances near the outer circumference, and a pull ring (41) is fixedly mounted on the top surface of the installation top plate (4).

3. The downhole magnetic drilling fluid filter device according to claim 2, characterized in that: The filter assembly (5) comprises a fixed filter cartridge (51), the mounting top plate (4) and the sealing base (8) are fixed to the top and bottom ends of the fixed filter cartridge (51), respectively, and the magnet bar (7) is fixedly mounted in the fixed filter cartridge (51).

4. The downhole magnetic drilling fluid filter device according to claim 3, characterized in that: The outer wall of the fixed filter cartridge (51) is equidistantly provided with a plurality of filter holes (511), and the outer wall of the fixed filter cartridge (51) is symmetrically provided with a group of limiting rings (512) in upper and lower directions. A rotating filter cartridge (52) is installed between the group of limiting rings (512) to limit the position.

5. The downhole magnetic drilling fluid filter device according to claim 4, characterized in that: The rotating filter cartridge (52) is rotatably connected to the outer wall of the fixed filter cartridge (51), and a plurality of filter holes (521) are equidistantly arranged on the outer wall of the rotating filter cartridge (52).

6. The downhole magnetic drilling fluid filter device according to claim 5, characterized in that: The top end of the outer wall of the rotating filter cartridge (52) is integrally formed with a mounting arm (522), and a stepping motor (53) is fixedly mounted on the bottom surface of the end of the mounting arm (522).

7. The downhole magnetic drilling fluid filter device according to claim 6, characterized in that: The rotating shaft of the stepping motor (53) passes through the mounting arm (522) and is coaxially connected to a driving gear (531). A gear ring (54) is coaxially fixedly mounted on the top of the fixed filter cartridge (51). The driving gear (531) is meshed and transmission-connected with the gear ring (54).

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