Gamma graduator for calibrating gamma probe while drilling

Abstract

The utility model relates to the technical field of geological exploration, in particular to a gamma graduator for calibrating a gamma probe while drilling, which comprises a port closing structure, an equipment main body and a shielding structure, and the port closing structure comprises a substrate; the equipment main body comprises a detection channel, and substrates are fixedly mounted at openings in two ends of the detection channel; the shielding structure comprises fixed lead plates, the fixed lead plates are annularly arranged at equal angles and fixedly installed on the side wall of the detection channel, and movable lead plates are rotationally installed on the outer side surfaces of the fixed lead plates. According to the utility model, the movable lead plate is rotated, the fixed lead plates and the movable lead plate which are arranged in a staggered manner are mutually positioned at the same position, and the through holes at the intervals of the fixed lead plates are opened, so that the detection end of the probe is in contact with a radioactive source to carry out calibration detection work; all the movable lead plates are rotated to block the through holes at the intervals of all the fixed lead plates, so that the radioactive source is relatively completely shielded, and ray leakage is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to geological exploration technical field, concretely is a gamma calibrator for calibrating while drilling gamma sonde. BACKGROUND

[0002] Wireless measurement while drilling instrument is a new type of measuring and logging instrument representing new drilling technology developed in the field of drilling, which can continuously monitor formation parameters and well trajectory, and is used more and more widely and is more and more important. Gamma logging using while drilling gamma sonde plays a very important role in measurement while drilling. The sensitivity and some related characteristics of the gamma sonde will change due to external influences; such as changes in the detection environment, instrument aging and fatigue use, replacement of parts during maintenance, etc. All these require that the gamma sonde must be checked for stability systematically and frequently before use. If it exceeds the permitted range, it needs to be recalibrated. Field calibration is used to complete the instrument traceability and normalization requirements.

[0003] The working principle of the gamma calibrator is to establish the relationship between the known radioactivity intensity and the instrument output count rate, so as to determine the response sensitivity and scale factor of the instrument. A radioactive source is placed inside, and the human body will be affected by gamma rays after being exposed to them. The safety of the current gamma calibrator still has defects. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a gamma calibrator for calibrating while drilling gamma sonde to solve the problems in the above background technology.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] A gamma calibrator for calibrating while drilling gamma sonde, comprising:

[0007] The through opening sealing structure comprises a base plate;

[0008] The device body comprises a detection channel, and the detection channel is fixedly installed with a base plate at the opening of both ends;

[0009] The shielding structure comprises a fixed lead plate, which is fixedly installed on the side wall of the detection channel in a ring-shaped equiangular arrangement, and the outer surface of the fixed lead plate is rotatably installed with a movable lead plate.

[0010] Further, the through opening sealing structure further comprises:

[0011] The outlet is provided in the middle of the base plate;

[0012] An enclosed curtain movable slot is arranged on the outlet side wall.

[0013] Further, the through opening sealing structure further comprises:

[0014] A receiving sleeve is fixedly installed on the upper and lower side surfaces of the base plate.

[0015] A reset spring is sleeved on the top of the receiving sleeve.

[0016] A top rod is sleeved on one end of the receiving sleeve.

[0017] A flexible composite material strip is fixedly connected to the other end of the top rod, and is slidably installed in the enclosed curtain movable slot.

[0018] A lead cloth is fixedly connected to one side of the edge of the enclosed curtain movable slot, and is fixedly connected to the other side of the flexible composite material strip.

[0019] Further, the device body further comprises:

[0020] A base is hingedly connected to the upper side of the cover, and a detection channel is arranged in the middle of the splicing surface of the base and the cover.

[0021] A support frame is fixedly installed on the bottom side of the base.

[0022] A handle is fixedly installed on the upper side surface of the cover.

[0023] A lock catch is fixedly installed in the middle of the front side splicing joint of the base and the cover.

[0024] Further, the shielding structure further comprises:

[0025] A radioactive source placing groove is arranged on the side wall of the detection channel.

[0026] Rod-shaped radioactive sources are arranged in a ring shape and are fixedly installed in the radioactive source placing groove.

[0027] A sealing plate is fixedly installed on the opening of the radioactive source placing groove of the splicing surface of the base and the cover.

[0028] Further, the shielding structure further comprises:

[0029] A rotating ring is fixedly installed on both ends of the movable lead plate.

[0030] A pushing block is fixedly installed on the upper side of the rotating ring in the cover.

[0031] Compared with the prior art, the device has the advantages that:

[0032] The detection end of the while-drilling gamma probe is clamped in the detection channel, at this time the rotating movable lead plate is rotated, the fixed lead plate and the movable lead plate arranged in a staggered manner are in the same position, and the through holes at the intervals of the fixed lead plate are opened, so that the detection end of the probe is in contact with the radioactive source, and the calibration detection work is carried out; and before and after the overall device is in an idle state, the through holes at the intervals of the fixed lead plate are blocked by rotating the movable lead plate, the radioactive source is relatively completely shielded, radiation leakage is avoided, unnecessary influence on the workers is avoided, and safety is improved.

[0033] When the detection end of the probe clamped in the detection channel of the device main body is closed, the two ends of the detection end are clamped by the outlet, and the flexible composite material strip is abutted against the side surface of the detection end under the action of the reset spring pushing the jack, so as to block the gap between the side wall of the outlet and the side surface of the detection end; the flexible composite material strip is made of methyl vinyl silicone rubber as a base body and heavy metal lead as a functional filler, cooperates with the lead cloth to realize relatively complete shielding of the radioactive source, and further improves the use safety. BRIEF DESCRIPTION OF DRAWINGS

[0034] Fig. 1 It is a whole structure schematic view of the utility model;

[0035] Fig. 2 It is a through hole closing structure schematic view in the utility model;

[0036] Fig. 3 It is a device main body schematic view in the utility model;

[0037] Fig. 4 It is a shielding structure schematic view in the utility model;

[0038] Fig. 5 It is a cover schematic view in the utility model;

[0039] Fig. 6 It is a shielding structure part schematic view in the utility model.

[0040] In the drawing: 1, through hole closing structure; 101, base plate; 102, curtain movable slot; 103, outlet; 104, storage sleeve; 105, reset spring; 106, jack; 107, flexible composite material strip; 108, lead cloth; 2, device main body; 201, base; 202, cover; 203, support frame; 204, handle; 205, lock catch; 206, detection channel; 3, shielding structure; 301, radioactive source placing groove; 302, fixed lead plate; 303, movable lead plate; 304, rotating ring; 305, push block; 306, rod-shaped radioactive source; 307, sealing plate. DETAILED DESCRIPTION

[0041] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0042] Please refer to Figs. 1-6 In the embodiment of the present application, a gamma calibrator for calibrating a while-drilling gamma sonde comprises a through-hole closed structure 1, a device main body 2 and a shielding structure 3. The through-hole closed structure 1 comprises a base plate 101. The device main body 2 comprises a detection channel 206, and the base plate 101 is fixedly installed at the opening of the detection channel 206. The shielding structure 3 comprises fixed lead plates 302, which are fixedly installed at the side wall of the detection channel 206 in a ring-shaped equiangular arrangement, and the outer side surface of each fixed lead plate 302 is rotatably installed with a movable lead plate 303.

[0043] Specifically, the detection end of the while-drilling gamma sonde is clamped in the detection channel 206, and at this time, the movable lead plate 303 is rotated to make the fixed lead plates 302 and the movable lead plates 303 arranged in a staggered manner be located at the same position, thereby opening the through holes at the intervals between the fixed lead plates 302 to make the detection end of the sonde contact the radioactive source and perform calibration and detection work. In the idle state of the overall device and before and after detection, each movable lead plate 303 is rotated to block the through holes at the intervals between the fixed lead plates 302, thereby relatively completely shielding the radioactive source and avoiding the leakage of radiation to unnecessarily affect the workers and improve the safety. Embodiment one

[0044] As shown in Figs. 3-4 In the embodiment, the device main body 2 further comprises a base 201, a support frame 203, a handle 204 and a lock catch 205. The base 201 is hingedly connected with a cover 202 at the upper side, and the detection channel 206 is formed in the middle of the splicing surface of the base 201 and the cover 202. The support frame 203 is fixedly installed at the bottom side of the base 201. The handle 204 is fixedly installed on the upper side surface of the cover 202. The lock catch 205 is fixedly installed in the middle of the front splicing joint of the base 201 and the cover 202.

[0045] In the embodiment, the base 201 and the cover 202 are designed as an open-close type. The cover 202 can be rotated and opened, the detection end is clamped on the upper surface of the base 201, the cover 202 is closed, the detection end is packaged in the detection channel 206, and the lock catch 205 is locked to avoid the accidental opening of the cover 202 during detection, which leads to the leakage of radiation.

[0046] As shown in Figs. 4-6As shown, in this embodiment, the shielding structure 3 further includes a radiation source placement slot 301, a rotating ring 304, a lever 305, a rod-shaped radiation source 306, and a sealing plate 307. The radiation source placement slot 301 is located on the side wall of the detection channel 206. The rod-shaped radiation sources 306 are arranged in a ring at equal angles and fixedly installed in the radiation source placement slot 301. The sealing plate 307 is fixedly installed at the opening of the radiation source placement slot 301 on the splicing surface of the base 201 and the cover 202. The rotating ring 304 is fixedly installed at both ends of the movable lead plate 303. The lever 305 is fixedly installed on the upper side of the rotating ring 304 inside the cover 202.

[0047] In practice, the rod-shaped radiation source 306 is encapsulated inside the radiation source placement slot 301 by the staggered fixed lead plates 302 and movable lead plates 303. During the testing process, the fixed rotating ring 304 of the toggle block 305 is rotated at a certain angle, thereby causing each movable lead plate 303 to deflect until it overlaps with the fixed lead plate 302, thus releasing the encapsulation. Example 2

[0048] Based on Embodiment 1, in order to compensate for the situation in Embodiment 1 where the gap between the openings on both sides of the detection channel 206 and the side surface of the detection end would cause radiation leakage after the movable lead plate 303 is opened when the base 201 and the cover 202 are closed.

[0049] like Figs. 1-2 As shown, in this embodiment, the through-hole sealing structure 1 further includes a curtain-sealing movable groove 102, an outlet 103, a storage sleeve 104, a return spring 105, a top rod 106, a flexible composite material strip 107, and a lead cloth 108. The outlet 103 is inserted into the middle of the substrate 101; the curtain-sealing movable groove 102 is opened at the side wall of the outlet 103; the storage sleeve 104 is fixedly installed on the upper and lower surfaces of the substrate 101; the return spring 105 is sleeved on the top of the storage sleeve 104; one end of the top rod 106 is slidably sleeved with the storage sleeve 104; the middle and two ends of the flexible composite material strip 107 are fixedly connected to the other end of the top rod 106, and the flexible composite material strip 107 is slidably installed inside the curtain-sealing movable groove 102; one side of the lead cloth 108 is fixedly connected to the edge of the curtain-sealing movable groove 102, and the other side of the lead cloth 108 is fixedly connected to the flexible composite material strip 107.

[0050] In specific implementation, when the detection tube probe end, which is locked inside the detection channel 206, is closed as a whole in the main body 2 of the equipment, and the through hole at the interval of the fixed lead plate 302 is opened, both ends of the probe end will be locked by the outlet 103. At the same time, the flexible composite material strip 107 will abut against the side surface of the probe end under the action of the push rod 106 pushed by the return spring 105, sealing the gap between the side wall of the outlet 103 and the side surface of the probe end. The flexible composite material strip 107 is made of methyl vinyl silicone rubber as the matrix and heavy metal lead is added as a functional filler. Together with the lead cloth 108, it can achieve relatively complete shielding of the radiation source, further improving the safety of use.

[0051] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments, but that the application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments should, therefore, be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalents of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the scope of the claims concerned.

[0052] Furthermore, it should be understood that although the present specification describes exemplary embodiments, the application is not limited to only one independent technical solution in each embodiment, and the specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by a person skilled in the art.

Claims

1. A gamma calibrator for calibrating a logging-while-drilling gamma sonde, the gamma calibrator comprising: Include: The through opening closing structure (1) includes a base plate (101); The device body (2) includes a detection channel (206), and the base plate (101) is fixedly installed at both ends of the opening of the detection channel (206); The shielding structure (3) includes a fixed lead plate (302), which is fixedly installed at the side wall of the detection channel (206) in an equiangular arrangement, and the outer side surface of the fixed lead plate (302) is rotatably installed with a movable lead plate (303).

2. The gamma calibrator for calibrating a logging-while-drilling gamma ray tool of claim 1, wherein, The through opening closing structure (1) further comprises: The outlet (103) is provided in the middle of the base plate (101); The curtain movable slot (102) is provided on the side wall of the outlet (103).

3. The gamma calibrator for calibrating a logging-while-drilling gamma ray tool of claim 2, wherein, The through opening closing structure (1) further comprises: The receiving sleeve (104) is fixedly installed on the upper and lower side surfaces of the base plate (101); The reset spring (105) is sleeved on the top of the receiving sleeve (104); The top rod (106) is slidably sleeved with the receiving sleeve (104) at one end; The flexible composite material strip (107) is fixedly connected with the other end of the top rod (106) at the middle and both ends, and is slidably installed in the curtain movable slot (102); The lead cloth (108) is fixedly connected with the edge of the curtain movable slot (102) on one side, and is fixedly connected with the flexible composite material strip (107) on the other side.

4. The gamma calibrator for calibrating a logging-while-drilling gamma ray tool of claim 3, wherein, The device body (2) further comprises: The base (201) is hingedly connected with the cover (202) on the upper side, and the detection channel (206) is provided in the middle of the splicing surface of the base (201) and the cover (202); The support frame (203) is fixedly installed on the bottom side of the base (201); The handle (204) is fixedly installed on the upper side surface of the cover (202); The lock catch (205) is fixedly installed in the middle of the front side splicing joint of the base (201) and the cover (202).

5. The gamma calibrator for calibrating a logging-while-drilling gamma ray tool of claim 4, wherein, The shielding structure (3) further comprises: The radioactive source placing groove (301) is provided on the side wall of the detection channel (206); The rod-shaped radioactive source (306) is fixedly installed in the radioactive source placing groove (301) in an equiangular arrangement; The sealing plate (307) is fixedly installed at the opening of the radioactive source placing groove (301) of the splicing surface of the base (201) and the cover (202).

6. The gamma calibrator for calibrating a logging-while-drilling gamma ray tool of claim 5, wherein, The shielding structure (3) further comprises: The swivel (304) is fixedly installed at both ends of the movable lead plate (303); The knob (305) is fixedly installed on the upper side of the swivel (304) in the cover (202).

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