CN2229970Y - Radioactivity type instrument placed in well for measuring well - Google Patents

Abstract

The utility model relates to a radioactivity type instrument placed in a well for measuring the well. On the basis of the existing structure, the utility model mainly improves the following components; the source cup of a neutron source assembly is fixedly provided with a source cup handle and is connected with a locking mechanism; the neutron radioactive source can be installed and taken off rapidly and conveniently; a key fitting sheath is provided with a long keyway; when the utility model is divided into segments for connection, the connection points are additionally provided with anti-rotation structures; a crystal and a photomultiplier tube adopt a component which can resist the temperature higher than 300 DEG C; a thermos bottle is removed. The outside diameter of the instrument is 60-70 mm, and the utility model has the advantages of more reliable performance, and convenience for installation, use and maintenance, and can be connected with a ground instrument to achieve the well logging requirement of an oil well with a small well hole.

Description

Radioactive logging down-hole instrument

The utility model belongs to the borehole logging tool instrument of windowing, and is in particular a kind of radioactive logging down-hole instrument.

Radioactive logging divides natural gamma ray logging to declare with neutron gamma to log well, the natural gamma curve that the natural gamma ray logging method obtains is mainly used in to be made disconnected lithology and asks shale content, natural gamma ray logging can carry out in cased well, be used with the magnetic localizer of measuring casing coupling, can determine the position of perforation and sampling, can also be an oil-gas bearing area or texturally separately carry out the section contrast.The neutron gamma log that the neutron gamma well logging method obtains combines with the gamma curve of nature, is used for dividing lithology and calculates degree of porosity, and during practical application, natural gamma ray logging and neutron gamma well logging can be used in combination.Logger divides down-hole instrument and ground instrument two parts; the down-hole instrument mainly comprises neutron source, lead screen, crystal, photomultiplier, electronic circuit and line frame, wave detector, magnetic localizer, multicore plug-in unit and joins parts such as key cover; these parts are positioned in the steel casing; components and parts are connected by circuit; the upper end of shell is protected with upper plug head, when carrying out natural gamma ray logging, neutron source is taken off; when carrying out the neutron gamma well logging, again neutron source is installed.

The not enough main following points that this device exists:

(1) because the neutron gamma ray is very big to the human injury, to take off and will put into plumbous box behind the cup of source and preserve, speed wants fast when therefore requiring to install or remove neutron source.Existing apparatus, the neutron source assembly is made up of chamber, source, source cup, cup chamber, source, neutron radiation source, screw, and screw is used for the source cup is fixed to the chamber, source, realize by this screw when installing or removing, but that service speed can't realize is the fastest; (2) the multicore plug-in unit is joined key and is enclosed within when connecting with ground instrument, and circuit is tangled, and multicore plug-in unit end face do not expose, and is not easy to check wrong plug easily; (3) make for convenience, install, shell generally is divided into several sections, and then links up, and its bind mode is a screw-type, and is extremely inconvenient for two sections heavier or long steel pipes.This instrument external diameter is big, the plain tubing specification that has adapted to present China oil field is the situation of 5 cun and 7 cun, but along with the exploitation in some big-and-middle-sized oil fields such as Shengli Oil Field enters the intermediary and later stages, for guaranteeing its output, just making great efforts to exploit potentialities, reduce and open cost, generally tilted direction is opened a window-like inclined hole on the basis of former abandoned well, be lowered to sleeve pipe and arrive oil reservoir, reach the purpose of getting oil, at this moment oil pipe specification is generally 3 cun or 3 cun half, and existing like this logger is just inapplicable, need reduce its external diameter.

The purpose of this utility model is to overcome the deficiency that prior art exists, and provides a kind of performance better, and is easy to use, is more suitable in the radiation well logging down-hole instrument that the slim-hole oil well uses.

The purpose of this utility model realizes in the following way:

Radiation well logging down-hole instrument, comprise upper plug head and shell, comprise the multicore plug-in unit in the shell from top to bottom and join key cover, magnetic localizer, wave detector, electronic circuit and line tower, photomultiplier, crystal, lead screen, neutron source assembly, feature is: the neutron source assembly is made up of chamber, source, source cup, cup chamber, source, neutron radiation source, source cup handle, locking mechanism, source cup handle and source cup are integral, and connect locking mechanism.

Above-mentioned locking mechanism is made up of backing pin, spring, plug screw, screw, and plug screw is fixed on the chamber, source.

The above is joined key and overlaps a side and have long keyseat.

Be manufacturing, easy for installation, shell is divided into five sections, and each intersegmental employing anti-rotation structure links up.

Below in conjunction with description of drawings:

Fig. 1 is the utility model positional structure schematic diagram.

Fig. 2 is a neutron source assembly structure schematic diagram.

Fig. 3 is for joining key nested structure schematic diagram.

Fig. 4 is the anti-rotation structure schematic diagram.

Among the figure: 1 upper plug head, 2 multicore plug-in units and join key cover, 3 magnetic localizers, 4 wave detectors, 5 electronic circuits and line frame, 6 photomultipliers, 7 crystal, 8 lead screens, 9 neutron source assemblies, chamber, 10 source, 11 source cups, 12 neutron radiation sources, cup chamber, 13 source, 14 source cup handles, 15 backing pins, 16 springs, 17 plug screws, 18 screws, 17 long keyseats, 20 little snap rings, 21 little baffle rings, 22 minor thread covers, 23 back-up rings, 24 sealing rings, 25 holes, 26 plus couplings, 27 shells.

Fig. 1 shows each position component structural representation of the utility model, same with prior art, housing parts is divided into five sections: in be connected with upper plug head first section multicore plug-in unit (13 core plug-in unit) is arranged and join key cover 2, locator 3 and wave detector 4 are magnetic in second section, electronic circuit and line frame 5 are arranged in the 3rd section, photomultiplier 4, crystal 3, be lead screen 8 in the 4th section, be neutron source assembly 9 in the 5th section, link up by anti-rotation structure between each section, as shown in Figure 4, anti-rotation structure is by lesser calorie ring 20, little baffle ring 21, minor thread cover 22, back-up ring 23 is formed, two sections joint is overlapping a bit of during connection, be positioned on the shell of one section joint of nexine and fix little baffle ring 21, lesser calorie ring 21, be used to stop minor thread cover 22, little snap ring is formed by the two halves butt joint, back-up ring 23 is used for fixing the little snap ring of two halves, be positioned on the outer casing inner wall of outer field one section joint and be threaded, when connecting, be inserted in the little volution cover of rotation in the hole 25 that little volution puts with instrument, two sections can be linked up easily, need not rotate two sections steel pipes.

As Fig. 2, neutron source assembly structure source cup handle 14 is fixed on the source cup 11, and locking mechanism is made up of backing pin 15, spring 16, plug screw 17, screw 18, in the time of need taking off the source cup, with instrument backing pin is turned back, and can promptly take off by source cup handle, and is promptly convenient again rapidly.

As Fig. 3, join a side of key cover 2 and drive a long keyseat 19, circuit entanglement when it can prevent effectively that the down-hole instrument from connecting with the ground instrument, and also joining key, to overlap end face concordant with its steel casing (first section shell) end face, thereby 13 core plug-in unit end faces are exposed, be convenient to grafting, the inspection of components and parts.When it is connected with upper plug head, add a plus couplings 26 by screw thread on the shell of joining key cover end, this tip side is longer than and is joined key cover end, and it is connected with upper plug head again.Added plus couplings 26 joining on the key cover shell shown in the figure.

The utility model crystal, photomultiplier adopt the components and parts of heatproof more than 300 ℃, can not need with the parts of original this heavy bulkiness of device vacuum flask, be fixed on the shell by support or plug etc. and get final product.

This instrument external diameter is 60～70mm, and the best is 60mm, and the preferred dimension little components and parts of trying one's best for reaching certain voltage endurance capability, select for use the 35CrMo steel to make shell.Magnetic localizer partly is the antimagnetic steel shell.

Advantage of the present utility model: performance is more reliable, use, installation, maintenance is convenient, External diameter is little, is more suitable in the logging requirements of slim-hole oil well.

Claims (7)

1, radioactive logging down-hole instrument, comprise upper plug head (1) and shell, comprise the multicore plug-in unit in the shell from top to bottom and join key cover (2), magnetic localizer (3), wave detector (4), electronic circuit and line frame (5), photomultiplier (6), crystal (7), lead screen (8), neutron source assembly (9), it is characterized in that: described neutron source assembly (9) is made up of chamber, source (10), source cup (11), cup chamber, source (13), neutron radiation source (12), source cup handle (14), locking mechanism, source cup handle (14) is integral with the source cup, is locked by locking mechanism.

2, down-hole according to claim 1 instrument is characterised in that described locking mechanism is made up of backing pin (15), spring (16), plug screw (17), screw (18), and plug screw (17) is fixed on the chamber, source.

3, down-hole according to claim 1 instrument is characterised in that a described side of joining key cover (2) has long keyseat (19).

4, down-hole according to claim 1 instrument, be characterised in that shell is formed by five sections connections, the multicore plug-in unit is arranged and join the key cover in connect with upper plug head first section, locator, wave detector are magnetic in second section, electronic circuit and line frame, photomultiplier, crystal are arranged in the 3rd section, in the 4th section the lead screen device is arranged, the 5th section is the neutron source assembly.

5, down-hole according to claim 4 instrument, each intersegmentally links up with anti-rotation structure to be characterised in that upper plug head and shell, shell, this anti-rotation structure is made up of little snap ring (20), little baffle ring (21), minor thread cover (22), back-up ring (23), back-up ring places on the snap ring, during connection, two sections joint is overlapping, has anti-rotation structure on the joint, and another inner nosepiece wall is threaded.

6, down-hole according to claim 4 instrument is characterised in that to join the key cover concordant with its shell end face, adds a plus couplings (26) on its shell and is connected with upper plug head.

7, down-hole according to claim 1 instrument is characterised in that its external diameter is 60～70mm, and the best is 60mm.

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