CN203430447U

CN203430447U - Inner side hole type drill pipe filter

Info

Publication number: CN203430447U
Application number: CN201320514342.6U
Authority: CN
Inventors: 吴明; 陶瑞东; 张建荣; 许京国; 刘如军; 杨静
Original assignee: CNPC Bohai Drilling Engineering Co Ltd
Current assignee: CNPC Bohai Drilling Engineering Co Ltd
Priority date: 2013-08-21
Filing date: 2013-08-21
Publication date: 2014-02-12
Anticipated expiration: 2023-08-21

Abstract

The utility model discloses an inner side hole type drill pipe filter which comprises an outer sleeve cylinder and a filter core. An upper end cover and a lower end cover are arranged on an upper port and a lower port of the outer sleeve cylinder. The middle portion of the upper end cover extends downwards to form a protruding part. A plurality of liquid inlets are formed in the zone expect the middle portion of the upper end cover. A circular through hole is formed in the center of the lower end cover. The filter core is in a cylinder shape. The upper end of the filter core is connected with the protruding part in an embedding mode. The lower end of the filter core is in thread connection with the circular through hole in the lower end cover. Screen holes are formed in the cylinder-shaped wall face and the circular bottom face of the filter core. The drill pipe filter is simple in structure, light in weight, convenient to operate and suitable for various drill pipes, fluid impurities are filtered, drill bit water hole blocking by foreign matter is avoided, meanwhile, damage on a drill rod is avoided, the filter core can be disassembled, and washing and replacing are convenient.

Description

Inner side cellular type drill pipe filter

Technical field

The utility model relates to field of oil drilling, particularly relates to a kind of inner side cellular type drill pipe filter.

Background technology

At present, situ of drilling well at home, for preventing the bulky grain drilling cuttings in slurries and other foreign matters from being blocked bit ports in drilling process, in the circulating system, need to install additional various cleaners, to realize the object of filtering slurries, and then reduce unnecessary trip-out, improve bit speed.

So far widely used is to install drill pipe filter additional in drilling rod box under kelly saver sub (abbreviation side protect joint), and this mode easy accessibility is workable.Drill pipe filter used roughly has three kinds at present: the first is simple screen casing shape filter, adopts spray regime from inside to outside, but under this mode, mud impact has serious thorn damage evil to drilling tool inwall, has greatly shortened the application life of drilling tool; The second is to install one section of urceolus additional in original screen casing outside, can effectively protect drilling tool inwall not damaged by thorn, but this structure is short application life, urceolus is subject to damage also, and under screen casing shape inner core, terminal spine damage situation is difficult for watching, easily cause inner core bottom and cover plate in use to come off, cause down-hole accident; The third is the DC drill rod filter being contained in female joint hoop, and it has changed slurries trend, and ecto-entad sprays, avoid drilling tool inwall thorn damage situation, owing to considering, will be convenient to stacks, so its entire length is only 150mm, screen area is relatively little, and filter effect is limited.

Summary of the invention

The technical problems to be solved in the utility model be to provide a kind of less to drilling rod hydrophthalmia inwall thorn damage evil, the life-span long and the drill pipe filter of good filtration effect.

For this reason, the technical solution of the utility model is as follows:

A kind of inner side cellular type drill pipe filter, comprise outer sleeve and filter core, the upper port of described outer sleeve and lower port have respectively upper end cover and bottom end cover, described upper end cover middle part extends to form a protuberance downwards, on region on upper end cover except middle part, form a plurality of inlet openings, described bottom end cover center is formed with manhole; Described filter core is tubular, and its upper end is connected with described protuberance embedding, bottom is threaded with described bottom end cover, on the tubular wall of described filter core, is formed with sieve aperture, and filter core bottom is formed with outage.

Described protuberance lower end has a conical socket to inner recess, and the upper end of described filter core is coniform and embeds in the conical socket of protuberance lower end.

Preferably, the diameter of described filter core bottom is increasing, is horn-like, and this arcuate structure can guarantee the integraty of filter core on the one hand, increases filter screen intensity, and lower end is bell mouth shape in addition, can increase end liquid outlet diameter, avoids stream to press too high.

In addition, preferably, the screen-aperture≤8mm on described filter core wall.

Inner side of the present utility model cellular type drill pipe filter is simple in structure, lightweight, easy to operate, applicable all kinds drilling rod.This cleaner adopts change flow direction, makes the mobile mode of fluid ecto-entad, when fluid is flowed through filter screen, forms relative jet, effectively plays the effect of buffering jet impulse.When filtering fluid impurity, preventing foreign body obstruction bit port, avoided the damage to drilling rod.In addition, this filter element is detachable, and it is convenient to clean, change, and has saved cost of production.

Accompanying drawing explanation

Fig. 1 is the cross-sectional view of the utility model drill pipe filter;

Fig. 2 is the schematic top plan view at upper end cover place in Fig. 1;

Fig. 3 is the elevational schematic view of filter core bottom in Fig. 1.

The specific embodiment

Below in conjunction with accompanying drawing, the structure of inner side of the present utility model cellular type drill pipe filter is elaborated.

Referring to Fig. 1-Fig. 3, this cleaner comprises outer sleeve 1 and filter core 2, the upper port of outer sleeve 1 and lower port have respectively upper end cover 3 and bottom end cover 4, upper end cover 3 middle parts extend to form protuberance 5 downwards, on region on upper end cover 3 except middle part, form a plurality of inlet openings 6, in illustrated embodiment, inlet opening 6 is provided with 4 altogether.In addition, at bottom end cover 4 centers, be formed with manhole.

Specifically, protuberance 5 lower ends have a conical socket to inner recess, and the upper end of filter core 2 is coniform and embeds in this conical socket, and this structure is convenient to accurate location when assembling.

Filter core 2 is tubular, and its upper end is connected with protuberance 5 embeddings, bottom is threaded with described bottom end cover 4, so that the dismounting of filter core and replacing.On the tubular wall of filter core 2, be formed with sieve aperture 7 so that drilling fluid is filtered.In filter core 2 bottoms, be formed with outage 8, the drilling fluid of being convenient to after filtering is discharged.

In addition, as shown in the figure, filter core 2 bottoms are horn-like, and more down diameter is increasing, can increase end liquid outlet diameter, avoid stream to press too high.

In an embodiment of the present utility model, urceolus 1 length is 400mm, the screen-aperture≤8mm on filter core 2 walls.Certainly, when reality is used, can to above-mentioned size, carry out corresponding adjusting according to different drilling rods and/or different inner diameters.

Below the course of work of this drill pipe filter is described:

Drilling fluid in descending process, enters in the sleeve forming between urceolus and filter core after the cleaner top section inlet opening of flowing through in drilling rod, and by filter element filtering impurity, descending afterwards, enter drilling rod hydrophthalmia, reach filtration object.

Claims

1. an inner side cellular type drill pipe filter, comprise outer sleeve and filter core, it is characterized in that: the upper port of described outer sleeve (1) and lower port have respectively upper end cover (3) and bottom end cover (4), described upper end cover (3) middle part extends to form a protuberance (5) downwards, on the upper region except middle part of upper end cover (3), form a plurality of inlet openings (6), described bottom end cover (4) center is formed with manhole; Described filter core (2) is tubular, and its upper end is connected with described protuberance (5) embedding, bottom is threaded with described bottom end cover (4), is formed with sieve aperture (7) on the tubular wall of described filter core (2), and filter core (2) bottom is formed with outage (8).

2. inner side according to claim 1 cellular type drill pipe filter, is characterized in that: this protuberance (5) lower end has a conical socket to inner recess, and the upper end of described filter core (2) is coniform and embeds in the conical socket of protuberance (5) lower end.

3. inner side according to claim 1 cellular type drill pipe filter, is characterized in that: the diameter of described filter core (2) bottom is increasing, is horn-like.

4. according to the inner side cellular type drill pipe filter described in any one in claim 1-5, it is characterized in that: the screen-aperture≤8mm on described filter core (2) wall.