CN201448107U

CN201448107U - Downhole device of sensing logging instrument

Info

Publication number: CN201448107U
Application number: CN 200920034201
Authority: CN
Inventors: 任志平; 党瑞荣; 李利品
Original assignee: Xian Shiyou University
Current assignee: Xian Shiyou University
Priority date: 2009-08-13
Filing date: 2009-08-13
Publication date: 2010-05-05
Anticipated expiration: 2019-08-13

Abstract

The utility model relates to a downhole device of a sensing logging instrument in the field of logging, comprising a magnetizing mechanism, an insulating sleeve, a sensing transmitting coil and a sensing receiving coil, wherein the magnetic mechanism consists of a power supply, a magnetizing coil, an iron core, an upper magnetic yoke, a lower magnetic yoke, a magnetic brush and an opening-closing rotor; the insulating sleeve is wrapped at the outer part of the magnetizing mechanism; the upper end and the lower end of the insulating sleeve are provided with wire grooves; and the sensing transmitting coil and the receiving coil are distributed at the outer side of the insulating sleeve by the wire grooves. The downhole device adopts the magnetizing mechanism to reduce the magnetic conductivity of the sleeve, applies the sensing logging technology to complete the detection to the formation characteristics of the outside of the sleeve of a production well, and is characterized by high efficiency, fastness and non-contact.

Description

A kind of induction type logging instrument downhole hardware

Technical field

The utility model relates to a kind of induction log tool downhole hardware in the well logging field.

Background technology

The production well log technology is deposit dynamic monitoring, remaining oil distribution research, the definite important technical of the exhausted index of oil gas, is the focus that the exploitation of petroleum resources middle and later periods is paid close attention to.With the difference of open hole well maximum be, metal sleeve has been installed in the producing well, because metal sleeve has good electrical conductivity and higher magnetic conductivity, the high-frequency electromagnetic signal of emission is most of in communication process in the sleeve pipe is shielded by metal sleeve, fail to form effective secondary field in the stratum outside the sleeve pipe, so receiving coil is difficult to receive the signal that has formation information.Still not having mature technique can eliminate the influence of sleeve pipe to induced signal both at home and abroad at present.The existence of metal sleeve has strengthened the difficulty of induction logging, has seriously restricted the application of induction logging technology in production well log.

The utility model content

The purpose of this utility model is to overcome the defective that prior art exists, a kind of induction logging device that is applicable to producing well is provided, utilize magnetizable body that sleeve pipe is magnetized processing, reduce the magnetic conductivity of sleeve pipe, use the detection of induction logging technology realization to stratum characteristic outside the producing well sleeve pipe on magnetized basis, whole device has efficient, quick, non-contacting characteristics.

Its technical scheme is achieved in that the downhole hardware of induction type logging instrument comprises magnetizable body, insulating sleeve, induced emission coil and induction receiving coil, the improvement part of technology is mainly reflected in: increased magnetizable body on the basis of existing induction log tool, magnetizable body is positioned at the center of down-hole well logging apparatus, at the outer wrap insulating sleeve of magnetizable body, insulating sleeve surface arrange induced emission coil and receiving coil.

Described magnetizable body comprises power supply, magnetizing coil, iron core, upper magnet yoke, lower yoke, magnetic brush and opening and closing rotor, and power supply provides constant direct current for magnetizing coil, produces the required magnetic field energy of sleeve pipe magnetization.Iron core is positioned at the cover tube hub, vertically be inserted in magnetizing coil inside, the upper/lower terminal of iron core is connected with upper magnet yoke, lower yoke respectively, constitute the skeleton of whole magnetizable body, magnetic brush is positioned at upper magnet yoke, lower yoke both sides, magnetic brush one end links to each other with upper magnet yoke, lower yoke by the opening and closing rotor, and the other end that drives magnetic brush when the opening and closing rotor is opened contacts with sleeve pipe.

Iron core in the described magnetizable body, upper magnet yoke, lower yoke, magnetic brush are the higher material of permeability.

Described insulating sleeve is nonmetal insulation material, is wrapped in the magnetizing coil outside, and the upper and lower surface of insulating sleeve all has wire casing, and induced emission coil and receiving coil are wrapped on the insulating sleeve by wire casing track up and down respectively.

Main effect of the present utility model is embodied in: 1, regulate magnetic brush by the opening and closing rotor and contact with sleeve pipe in the producing well, together with iron core, upper magnet yoke, lower yoke constitutes the magnetic loop of closure; 2, inject direct current by power supply in magnetizing coil, produce steady magnetic field in producing well, handling for the magnetization of sleeve pipe provides magnetic source; 3, handle by the magnetization near the sleeve pipe search coverage, the magnetic conductivity of sleeve pipe has reduced the influence of sleeve pipe to the inductive electromagnetic signal near reducing, and helps induced signal and passes sleeve pipe, realizes the detection to outside formation characteristics.

Description of drawings

Accompanying drawing 1 is a kind of example structure schematic diagram.

The specific embodiment

With reference to accompanying drawing 1, the upper end of induction type logging instrument downhole hardware is connected with cable 15, core is by power supply 6, magnetizing coil 7, iron core 8, upper magnet yoke 9, lower yoke 10, magnetic brush 11 and opening and closing rotor 13 constitute the magnetizable body 1 of downhole hardware, power supply 6 links to each other with magnetizing coil 7, magnetizing coil 7 outer wrap cylindrical nonmetal insulating sleeve 2, insulating sleeve 2 all has wire casing 3 up and down, induced emission coil 4 and receiving coil 5 are wrapped on the insulating sleeve 2 by the track of wire casing 3, iron core 8 is positioned at sleeve pipe 12 centers, vertically be inserted in magnetizing coil 7 inside, on the iron core 8, following two ends respectively with upper magnet yoke 9, lower yoke 10 connects, constitute the coil rack of whole magnetizable body, magnetic brush 11 is positioned at upper magnet yoke 9, lower yoke 10 both sides, magnetic brush 11 1 ends are by opening and closing rotor 13 and upper magnet yoke 9, lower yoke 10 links to each other, and the other end that drives magnetic brush 11 when opening and closing rotor 13 is opened contacts with sleeve pipe 12.

Start magnetizable body during work, in magnetizing coil 7, inject direct current by power supply 6, in producing well, produce stabilizing magnetic field, regulating magnetic brush 11 by opening and closing rotor 13 contacts with sleeve pipe 12 in the producing well, together with iron core 8, upper magnet yoke 9, lower yoke 10 constitutes closed magnetic loop, utilizes the conducting of the magnetic line of force in magnetic circuit to realize near the magnetization of the sleeve pipe search coverage is handled.

Need to prove, the difference part of employed apparatus subject and existing induction logging instrument mainly is to have increased the sleeve pipe magnetizing assembly among this embodiment, the detection on stratum outside on the magnetized basis of sleeve pipe, finishing to sleeve pipe, in addition other parts and existing technical measures are basic identical, in the present embodiment no longer explanation.

Claims

1. an induction type logging instrument downhole hardware comprises magnetizable body (1), insulating sleeve (2), induced emission coil (4) and induction receiving coil (5), it is characterized in that: magnetizable body is by power supply (6), magnetizing coil (7), iron core (8), upper magnet yoke (9), lower yoke (10), magnetic brush (11), opening and closing rotor (13) constitutes, magnetizable body is positioned at the center of downhole hardware, the outer wrap of magnetizable body insulating sleeve (2), insulating sleeve (2) all has wire casing (3) up and down, and induced emission coil (4) and induction receiving coil (5) are arranged on the insulating sleeve (2) by the track of wire casing (3).

2. induction type logging instrument downhole hardware according to claim 1, it is characterized in that: iron core in the described magnetizable body (8) is positioned at sleeve pipe (12) center, vertically be inserted in magnetizing coil (7) inside, on the iron core (8), following two ends respectively with upper magnet yoke (9), lower yoke (10) connects, constitute the skeleton of whole magnetizing assembly, magnetic brush (11) is positioned at upper magnet yoke (9), lower yoke (10) both sides, one end of magnetic brush (11) is by opening and closing rotor (13) and upper magnet yoke (9), lower yoke (10) links to each other, and the other end that drives magnetic brush (11) when opening and closing rotor (13) when opening contacts with sleeve pipe (12).

3. induction type logging instrument downhole hardware according to claim 1 is characterized in that: what the power supply in the described magnetizable body (6) produced is direct current, links to each other with magnetizing coil (7).

4. induction type logging instrument downhole hardware according to claim 2 is characterized in that: the iron core in the described magnetizable body (8), upper magnet yoke (9), lower yoke (10), magnetic brush (11) are the higher material of permeability.