CN115338487A - Neutron source emergency taking-out device and method - Google Patents

Abstract

The invention discloses an emergency neutron source taking-out device and method, which solve the technical problems of low disassembly efficiency, poor disassembly convenience and great radiation damage of a neutron source assembly. The device comprises a connecting piece, a connecting piece and a positioning piece, wherein the connecting piece is used for fixing the logging instrument; the electric spark machine is arranged on the connecting piece; the electrode is arranged on the main shaft of the electric spark machine, and the electrode and the main shaft of the electric spark machine are coaxial; the electric spark machine can control the electrode to rotate around the axis of the electrode in the process of moving along the axis direction of the electrode, the electrode is of a hollow cylindrical structure, and the electrode is used for being inserted into an assembly groove of a logging instrument and cutting a thread pair of the neutron source assembly. The invention can realize the emergency disassembly of the neutron source assembly, improve the disassembly efficiency and the disassembly convenience, and reduce the radiation injury of the neutron source, thereby protecting the personal safety of workers.

Description

Emergency neutron source taking-out device and method

Technical Field

The invention belongs to the technical field of neutron logging, and particularly relates to an emergency neutron source taking-out device and method.

Background

The neutron logging is to put the well-descending instrument with neutron source and detector into the well, the neutron logging is to detect the moderated neutron according to the fact that the fast neutron is easily moderated by the hydrogen-rich materials such as oil, natural gas, etc., or to detect the gamma radiation generated by the reaction of the moderated neutron and the surrounding medium, and to determine whether there is oil, gas and their reserves according to the detected radiation. Neutron sources are devices capable of releasing neutrons, and can be roughly divided into controllable neutron sources and chemical neutron sources, and currently, chemical neutron sources are commonly used in logging instruments.

The chemical neutron source utilizes the ray which emits certain energy when radioactive nuclide decays, and the neutron source always emits the ray outwards after the design is finished. The rays emitted by the neutron source are very harmful to human bodies, and particularly, the rays can cause serious damage to human organs, nerves and the like after a certain dosage is exceeded. Therefore, when the neutron source is installed, transported and stored, the factors such as the activity of the radioactive source, the operation distance, the operation time, the protection shielding and the like are fully considered, and protection measures are taken to ensure the personal safety of operators.

In the related technology, the neutron source is packaged in a metal shell to form a neutron source assembly, threads are designed on the shell, an assembly groove is formed on the logging instrument, and the shell is in threaded fit with the assembly groove so as to realize the connection of the neutron source assembly and the logging instrument. The neutron source assembly is installed on the instrument before the instrument enters the well, the threads are loosened and the neutron source assembly is disassembled quickly after the instrument exits the well, and then the neutron source assembly is placed in the shielding source tank for storage.

When workers disassemble the neutron source assembly, the problem that the thread pair of the neutron source assembly is easy to be stuck is caused, and even the problem that the hexagonal surface for applying force on the shell of the neutron source is damaged and the torque cannot be continuously applied due to overlarge applied torque. At this time, the worker can only use other tools to manually disassemble the neutron source assembly.

However, in the process of manually disassembling the neutron source assembly by the worker, the worker needs to stand by the logging instrument for a long time, and at the moment, the worker can bear large radiation of the neutron source, so that the personal health of the worker is easily damaged. Therefore, the disassembly efficiency of the neutron source assembly is improved, the disassembly convenience is improved, the radiation injury of the neutron source is reduced, and the method has important significance for protecting the personal safety of workers.

Disclosure of Invention

In order to solve all or part of the problems, the invention aims to provide an emergency neutron source taking-out device and method, which can improve the disassembly efficiency of a neutron source assembly, improve the disassembly convenience and reduce the radiation injury of a neutron source, thereby protecting the personal safety of workers.

In a first aspect, the invention provides an emergency neutron source extraction device, which comprises a connecting piece, a first connecting piece and a second connecting piece, wherein the connecting piece is used for fixing a logging instrument;

the electric spark machine is arranged on the connecting piece;

the electrode is arranged on a main shaft of the electric spark machine, and the electrode and the main shaft of the electric spark machine are coaxial;

the electric spark machine can control the electrode to rotate around the axis of the electrode in the process of moving along the axis direction of the electrode, the electrode is of a hollow cylindrical structure, and the electrode is used for being inserted into an assembly groove of a logging instrument and cutting a thread pair of the neutron source assembly.

Optionally, the electric discharge machine is detachably connected with the connecting piece.

Optionally, one of the electric spark machine and the connecting piece is provided with a magnetic attraction platform, and the other is provided with a magnetic base, so that the electric spark machine and the connecting piece can be detachably connected in a magnetic attraction manner.

Optionally, the electrode is detachably connected with a spindle of the electric discharge machine.

Optionally, the extraction device further comprises a positioning detector for aligning the electrode with a mounting slot of a logging instrument.

Optionally, the positioning detection element includes a centering sleeve, the centering sleeve is configured to be inserted into an assembly groove of the logging tool, the centering sleeve is engaged with the electrode, and the electrode can pass through the centering sleeve.

Optionally, the positioning detection component further includes a righting ruler, the righting ruler includes a righting seat and a righting barrel, the righting barrel is fixed on the righting seat, the righting seat is used for being connected with the connecting component, the righting barrel is fitted with the electrode, and the electrode can penetrate through the righting barrel.

Optionally, the connecting piece includes two clasping pieces, and one end of two clasping pieces is articulated mutually, and the other end passes through bolted connection to make two clasping pieces can clasp logging instrument.

In a second aspect, the invention provides an emergency extraction method of a neutron source by using an extraction device, which comprises the following steps:

s1, connecting a connecting piece with a logging instrument, and then connecting an electric spark machine with the connecting piece;

s2, fixing the electrode on a main shaft of an electric spark machine;

s3, adjusting the position of the electric spark machine, and aligning the electrode with an assembly groove of the logging instrument;

s4, driving the electrode to move along the axis direction of the electrode through a main shaft of the electric spark machine, enabling the electrode to be abutted against a thread pair of the neutron source assembly, and recording the initial position of the main shaft of the electric spark machine;

s5, starting the electric spark machine, driving the electrode to rotate through a main shaft of the electric spark machine, and driving the electrode to move along the axis direction of the electric spark machine so as to cut the thread pair of the neutron source assembly by the electrode;

s6, by observing the travel distance of the main shaft of the electric spark machine, after the completion of cutting of the thread pair of the neutron source is confirmed, the electric spark machine is shut down;

s7, disassembling the electric spark machine;

s8, taking out the neutron source assembly, and putting the neutron source assembly into a source tank;

and S9, disassembling the connecting piece.

Optionally, S41 is added between S4 and S5, and S51 is added between S5 and S6, wherein:

s41, placing the logging instrument into a water tank filled with shielding liquid, and enabling the shielding liquid to at least submerge the logging instrument;

and S51, extracting the shielding liquid in the water tank through an external water pumping device, cooling the electric spark machine by using the extracted shielding liquid, and taking away the cut metal slag by using the extracted shielding liquid.

According to the technical scheme, the emergency neutron source taking-out device and the emergency neutron source taking-out method have the following advantages:

the device can realize the emergent dismantlement to neutron source assembly to can improve and dismantle efficiency and dismantlement convenience, can also reduce neutron source radiation injury, thereby protect staff's personal safety.

Additional features and advantages of the invention will be set forth in the description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a schematic structural diagram of a removing device in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an electric discharge machine of the taking-out apparatus in the embodiment of the present invention;

FIG. 3 is a schematic view showing the structure of a connecting member of the taking-out apparatus in the embodiment of the present invention;

FIG. 4 is a schematic diagram of a configuration of a retrieval device coupled to a logging tool in an embodiment of the present invention;

FIG. 5 is a cross-sectional view of a logging tool in an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of the neutron source assembly cut by the taking-out device in the embodiment of the invention.

Description of reference numerals:

1. a connecting member; 11. a holding sheet; 12. a bolt; 2. an electric spark machine; 3. an electrode; 4. positioning the detection piece; 41. a centralizing sleeve; 42. righting the ruler; 421. a righting seat; 422. a righting cylinder; 5. a magnetic suction platform; 6. a magnetic base;

100. a logging instrument; 200. assembling the groove; 300. a neutron source assembly.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments of the present invention may be arbitrarily combined with each other without conflict.

Referring to fig. 1, 2, 3, 4, 5 and 6, an embodiment of the invention discloses an emergency neutron source extraction device, which comprises a connecting piece 1, an electric discharge machine 2, an electrode 3 and a positioning detection piece 4, wherein the connecting piece 1 is used for fixing with a logging instrument 100, the electric discharge machine 2 is detachably connected to the connecting piece 1, the electrode 3 is detachably connected to a main shaft of the electric discharge machine 2, and the electrode 3 is coaxial with the main shaft of the electric discharge machine 2.

In one embodiment, as shown in fig. 1-6, the electrode 3 is a cylindrical structure with a hollow interior, and the electrode 3 is configured to be inserted into the mounting slot 200 of the logging tool 100. Meanwhile, the electric spark machine 2 can control the electrode 3 to rotate around the axis of the electrode 3 in the process of moving along the axis direction of the electrode, so that the thread pair of the neutron source assembly 300 can be cut. At the same time, the positioning detection member 4 is used to quickly align the electrode 3 with the assembly slot 200 of the logging tool 100.

When the neutron source assembly 300 needs to be cut, the connecting piece 1 is fixed with the logging tool 100, and the electric spark machine 2 is fixed with the connecting piece 1. Subsequently, the position of the electric discharge machine 2 is adjusted, and the electrode 3 is position-detected by the position detector 4, so that the electrode 3 can be accurately inserted into the fitting groove 200. Subsequently, the electrode 3 is driven to rotate by the spindle of the electric discharge machine 2, and at the same time, the electrode 3 is driven to move downward by the spindle of the electric discharge machine 2, and then the electrode 3 can cut the thread pair of the neutron source assembly 300.

The emergency neutron source taking-out device in the embodiment can realize emergency cutting of the neutron source assembly 300, and workers do not need to stand beside the logging instrument 100 for a long time, so that the damage of neutron source radiation is reduced, and the personal safety of the workers is protected. Meanwhile, the design is convenient to operate, the dismounting efficiency of the neutron source assembly 300 can be improved, the dismounting convenience can be improved, and the working efficiency is further improved.

In one embodiment, as shown in fig. 1 to 6, the connector 1 comprises two fastening pieces 11, one end of each fastening piece 11 is hinged and the other end is connected by a bolt 12, so that the two fastening pieces 11 can form a hoop and fasten the logging instrument 100 to realize a quick connection with the logging instrument 100.

In one embodiment, as shown in fig. 1 to 6, the two fastening sheets 11 are respectively in a circular arc structure, the openings of the two fastening sheets 11 are opposite, and the two fastening sheets 11 can form a circular ring structure, so that the connecting member 1 can be adapted to logging instruments 100 with different shapes. Of course, the two clasping sheets 11 may also form a rectangular or polygonal structure, which may be designed according to the shape of the logging tool 100 to improve the fixing effect.

In one embodiment, as shown in fig. 1 to 6, one of the electric spark machine 2 and the connecting member 1 is fixedly connected with a magnetic attraction platform 5, and the other one of the electric spark machine 2 and the connecting member 1 is fixedly connected with a magnetic base 6, in this embodiment, the magnetic base 6 is fixed on the electric spark machine 2, and the magnetic attraction platform 5 is fixed on one of the clasping sheets 11, so that the electric spark machine 2 and the connecting member 1 form a detachable connection in a magnetic attraction manner, thereby facilitating the quick fixation of a worker on the electric spark machine 2, and further improving the working efficiency.

In one embodiment, as shown in fig. 1 to fig. 6, the surfaces of the magnetic platform 5 and the magnetic base 6 that contact each other are flat surfaces, and the two flat surfaces are attached to each other. Meanwhile, the main shaft of the electric spark machine 2 and the electrode 3 are respectively vertical to the plane, so that the main shaft of the electric spark machine 2 and the electrode 3 can be well positioned.

In one embodiment, as shown in fig. 1 to 6, the electrode 3 and the spindle of the electric discharge machine 2 may be connected by a snap fit, a screw, or other detachable connection methods, as long as the electrode 3 can be detached. This design enables the staff to select the electrode 3 of suitable size according to the external diameter of neutron source assembly 300 to improve the use suitability of extraction device.

In one embodiment, as shown in fig. 1 to 6, the positioning detection member 4 includes a centering sleeve 41 and a centering ruler 42, the centering sleeve 41 is used for being inserted into the assembly groove 200 of the logging instrument 100, and the outer diameter of the centering sleeve 41 is matched with the inner diameter of the assembly groove 200. Meanwhile, the inner diameter of the centering sleeve 41 is matched with the outer diameter of the electrode 3, and the electrode 3 can penetrate through the centering sleeve 41 and is abutted with the thread pair of the neutron source assembly 300.

In one embodiment, as shown in fig. 1 to 6, the righting ruler 42 includes a righting base 421 and a righting cylinder 422, the righting cylinder 422 is integrally connected to the righting base 421, and the righting base 421 is configured to be placed on the magnetic platform 5. The inner diameter of the righting cylinder 422 is matched with the outer diameter of the electrode 3, and the electrode 3 can sequentially pass through the righting cylinder 422 and the righting sleeve 41.

In one embodiment, as shown in fig. 1 to 6, one side of the centering seat 421 contacting the magnetic attraction platform 5 is a plane, the plane of the centering seat 421 fits the plane of the magnetic attraction platform 5, and the axis of the centering cylinder 422 is perpendicular to the plane of the centering seat 421, so as to limit the centering cylinder 422.

When the position of the electrode 3 needs to be calibrated, the centering seat 421 is placed on the magnetic attraction platform 5, and then the centering sleeve 41 is inserted into the assembly groove 200 of the logging tool 100. At this time, if the electrode 3 sequentially passes through the centering cylinder 422 and the centering sleeve 41 and abuts against the thread pair of the neutron source assembly 300 by controlling the downward movement of the electrode 3 through the spindle of the electric discharge machine 2, it is indicated that the positions of the parts such as the electric discharge machine 2 and the electrode 3 are calibrated, and then the cutting operation can be performed. If the righting cylinder 422 is displaced or the electrode 3 cannot be inserted into the righting sleeve 41 in the process of downward movement of the electrode 3, the displacement, bending or other problems of the electrode 3 or the spindle of the electric discharge machine 2 are shown, so that the rapid calibration of the positions of the electrode 3 and the like is realized.

As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, an embodiment of the present invention further discloses an emergency extraction method of a neutron source using an extraction device, which includes the following steps:

s1, respectively clamping two clamping pieces 11 on a logging instrument 100, then connecting the two clamping pieces 11 through bolts 12 to enable the two clamping pieces 11 to clamp the logging instrument 100, so that the connecting piece 1 and the logging instrument 100 are fixed, then placing a magnetic base 6 on a magnetic suction platform 5, and enabling the magnetic base and the magnetic suction platform 5 to form magnetic suction fixation, so that the electric spark machine 2 and the connecting piece 1 are fixed;

s2, fixing the electrode 3 on a main shaft of the electric spark machine 2, so that the electrode 3 and the main shaft of the electric spark machine 2 are provided with an axis;

s3, inserting the centering sleeve 41 into the assembly groove 200 of the logging instrument 100, simultaneously placing the centering seat 421 on the magnetic suction platform 5, then adjusting the position of the electric spark machine 2, if the electrode 3 can sequentially pass through the centering cylinder 422 and the centering sleeve 41 and enter the assembly groove 200 of the logging instrument 100, indicating that the spindle of the electric spark machine 2 and the electrode 3 are calibrated, thereby determining that the electrode 3 is aligned with the assembly groove 200 of the logging instrument 100, and then detaching the centering sleeve 41 and the centering seat 421;

s4, driving the electrode 3 to move along the self axis direction through a main shaft of the electric spark machine 2, enabling the electrode 3 to be abutted against a thread pair of the neutron source assembly 300, and simultaneously recording the initial position of the main shaft of the electric spark machine 2;

s41, placing the logging instrument 100 into a water tank filled with a shielding liquid, enabling the shielding liquid to at least immerse the logging instrument 100, and then evacuating people, wherein in the embodiment, the shielding liquid is clear water, and in other embodiments, other liquid shielding solutions can be adopted as long as the shielding of neutron source radiation can be realized;

s5, starting the electric spark machine 2, driving the electrode 3 to rotate through a main shaft of the electric spark machine 2, and driving the electrode 3 to move along the axis direction of the electrode 3 through the main shaft of the electric spark machine 2 so that the electrode 3 cuts a thread pair of the neutron source assembly 300;

and S51, extracting the shielding liquid in the water tank through an external water pumping device, cooling the electric spark machine 2 by using the extracted shielding liquid, and taking away the cut metal slag by using the extracted shielding liquid.

S6, by observing the advancing distance of the main shaft of the electric spark machine 2, after the completion of cutting of the thread pair of the neutron source is confirmed, the electric spark machine 2 is shut down;

s7, disassembling the electric spark machine 2;

s8, taking out the neutron source assembly 300, and putting the neutron source assembly 300 into a source tank;

and S9, disassembling the connecting piece 1.

According to the process, the whole process of taking out the neutron source is carried out in water, so that the radiation of the neutron source is effectively shielded, and the personal safety of workers is guaranteed. Meanwhile, the main shaft of the electric spark machine 2 and the electrode 3 are quickly positioned, so that the operation time of personnel is shortened, and the radiation irradiation time can be shortened. Moreover, the electric spark machine 2 is fixed with the connecting piece 1 through the mode of magnetism absorption, also can reduce personnel's operating time, just also can reduce the radiation exposure time to guarantee staff's personal safety in the at utmost.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (10)

1. An emergency neutron source extraction device, comprising:

the connecting piece (1) is used for fixing the logging instrument;

the electric spark machine (2) is arranged on the connecting piece (1);

the electrode (3) is arranged on a main shaft of the electric spark machine (2), and the electrode (3) and the main shaft of the electric spark machine (2) are coaxial;

the electric spark machine (2) can control the electrode (3) to rotate around the axis of the electrode in the process of moving along the axis direction of the electrode, the electrode (3) is of a hollow cylindrical structure, and the electrode (3) is used for being inserted into an assembly groove of a logging instrument and cutting a thread pair of a neutron source assembly.

2. The extraction device according to claim 1, characterised in that the electric spark machine (2) is removably connected to the connection element (1).

3. The extraction device according to claim 2, characterized in that one of the electric spark machine (2) and the connector (1) is provided with a magnetic platform (5) and the other is provided with a magnetic base (6), and the electric spark machine (2) and the connector (1) are detachably connected in a magnetic manner.

4. Extraction device according to claim 1, characterized in that the electrode (3) is removably connected to the main shaft of the electric discharge machine (2).

5. The extraction device according to claim 1, characterized in that it further comprises a positioning detector (4), said positioning detector (4) being adapted to align said electrode (3) with a fitting slot of a logging instrument.

6. Extraction device according to claim 5, characterised in that the positioning detection member (4) comprises a centering sleeve (41), the centering sleeve (41) being intended to be inserted into a mounting slot of a logging tool, the centering sleeve (41) being adapted to the electrode (3) and the electrode (3) being able to pass through the centering sleeve (41).

7. The extraction device according to claim 6, wherein the positioning detection member (4) further comprises a centering ruler (42), the centering ruler (42) comprises a centering seat (421) and a centering cylinder (422), the centering cylinder (422) is fixed on the centering seat (421), the centering seat (421) is used for connecting with the connecting member (1), the centering cylinder (422) is engaged with the electrode (3), and the electrode (3) can pass through the centering cylinder (422).

8. The taking-out device according to claim 1, wherein the connecting piece (1) comprises two holding sheets (11), one end of each of the two holding sheets (11) is hinged, and the other end of each of the two holding sheets is connected through a bolt (12), so that the two holding sheets (11) can hold the logging instrument tightly.

9. An emergency extraction method of a neutron source by using an extraction device according to any one of claims 1 to 8, characterized by comprising the following steps:

s1, connecting a connecting piece (1) with a logging instrument, and then connecting an electric spark machine (2) with the connecting piece (1);

s2, fixing the electrode (3) on a main shaft of the electric spark machine (2);

s3, adjusting the position of the electric spark machine (2), and aligning the electrode (3) to an assembly groove of the logging instrument;

s4, driving the electrode (3) to move along the axis direction of the electrode through a main shaft of the electric spark machine (2), enabling the electrode (3) to be abutted against a thread pair of the neutron source assembly, and simultaneously recording the initial position of the main shaft of the electric spark machine (2);

s5, starting the electric spark machine (2), driving the electrode (3) to rotate through a main shaft of the electric spark machine (2), and simultaneously driving the electrode (3) to move along the axis direction of the electrode (2) so that the electrode (3) cuts a thread pair of the neutron source assembly;

s6, by observing the advancing distance of the main shaft of the electric spark machine (2), after the completion of cutting of the thread pair of the neutron source is confirmed, the electric spark machine (2) is shut down;

s7, disassembling the electric spark machine (2);

s8, taking out the neutron source assembly, and putting the neutron source assembly into a source tank;

and S9, disassembling the connecting piece (1).

10. The takeout method of claim 9 wherein S41 is added between S4 and S5 and S51 is added between S5 and S6, wherein:

s41, placing the logging instrument into a water tank filled with shielding liquid, and enabling the shielding liquid to at least submerge the logging instrument;

and S51, extracting the shielding liquid in the water tank through an external water pumping device, cooling the electric spark machine (2) by using the extracted shielding liquid, and taking away the cut metal slag by using the extracted shielding liquid.

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