A multi-stage controllable isotope release device and a method of releasing the same

Abstract

The present disclosure relates to a multi-stage controllable isotope release device and its release method, comprising: a plurality of stages of isotope bins; a limiting release mechanism at the bottom end of the upper stage of isotope bins is connected with the limiting release mechanism at the top end of the lower stage of isotope bins; the limiting release mechanism has a release hole on the side wall, the inside of the limiting release mechanism is in communication with the inside of the isotope bin; a transmission mechanism is arranged in the inside of the isotope bin, the top end of the transmission mechanism of the first stage of isotope bins is connected with a driving mechanism; a sealing piston for plugging the release hole is arranged in the inside of the limiting release mechanism, the sealing piston is connected with the transmission mechanism; and the driving mechanism is connected with a control mechanism. To solve the problem that the previous isotope release device can only release the isotope once in one downhole process, for the logging construction which needs to release the isotope multiple times, the isotope can only be released by multiple instrument lifting and lowering, resulting in the problems of prolonged construction time, reduced construction efficiency and increased radiation dose of the construction personnel.

Description

Technical Field

[0001] This disclosure relates to the field of oilfield logging technology, and in particular to a multi-stage controllable isotope release device and its release method. Background Technology

[0002] In production logging, the reliable multiple releases of isotopes during well logging using solid radioactive sources (radioactive isotope microspheres, hereinafter referred to as isotopes) have always been a major challenge. Currently used release devices cannot achieve multiple quantitative releases; a single well run allows for only one isotope release. In some special or complex wells, if secondary isotope releases are required, multiple instrument string runs and reloading of the release device are necessary, significantly impacting the construction progress and increasing radiation exposure for workers. Furthermore, single isotope releases greatly extend construction time in large-diameter wells, long-section wells, and low-injection-rate wells, even affecting the accuracy and precision of data, increasing construction costs, and prolonging the construction process. Summary of the Invention

[0003] This disclosure proposes a multi-stage controllable isotope release device and its release method to solve the problem that previous isotope release devices could only release isotopes once during a single well run. For logging operations that require multiple isotope releases, the release could only be achieved by repeatedly pulling the instrument up and down, which led to extended construction time, reduced construction efficiency, and increased radiation exposure for construction personnel.

[0004] According to one aspect of this disclosure, a multi-stage controllable isotope release device is provided, comprising: several stages of isotope chambers; The top and bottom of the isotope chamber are respectively connected to a limiting release mechanism, and the limiting release mechanism at the bottom of the upper-level isotope chamber is connected to the limiting release mechanism at the top of the lower-level isotope chamber. The limiting release mechanism has a release hole on its side wall, and the interior of the limiting release mechanism is connected to the interior of the isotope chamber. The isotope chamber is equipped with a transmission mechanism. The top of the transmission mechanism of the first-stage isotope chamber is connected to the drive mechanism. In the initial state, the transmission mechanisms inside each stage of the isotope chamber are disconnected. The limiting release mechanism is equipped with a sealing piston for sealing the release hole, and the sealing piston is connected to the transmission mechanism; The drive mechanism is connected to the control mechanism, which controls the start of the drive mechanism. The drive mechanism drives the connected sealed piston to move downward to a predetermined position through the transmission mechanism. When the predetermined position is reached, the bottom end of the transmission mechanism connects to the top end of the transmission mechanism in the next level isotope chamber, and the control mechanism controls the drive mechanism to close.

[0005] Preferably, the limiting release mechanism includes: a limiting release head; The limiting release head has a first chamber inside; The sealing piston is located inside the first chamber, and the release hole is provided on the side wall of the first chamber. The side wall of the sealing piston is in contact with the side wall of the first chamber. The bottom end of the uppermost limiting release head is connected to the first-stage isotope chamber, and the top end is connected to the drive mechanism; The isotope chamber is connected to the interior of the first chamber.

[0006] Preferably, the transmission mechanism includes: a transmission shaft and a central shaft; The sealing piston in the limiting release mechanism connected to the top of the isotope chamber is the upper sealing piston, and the sealing piston in the limiting release mechanism connected to the bottom is the lower sealing piston. The central shaft is located inside the isotope chamber, and the top end of the central shaft is connected to the upper sealing piston. The top end of the upper sealing piston is connected to the bottom end of the drive shaft through a threaded structure. The sidewall of the central shaft is connected to the lower sealing piston, and the bottom end of the central shaft is located below the lower sealing piston. The upper sealing piston and the lower sealing piston each have a limiting pin on their sidewalls, and the first chamber has a limiting groove on its inner sidewall, with the limiting pin located inside the limiting groove. The limiting release head has a second chamber that communicates with the first chamber. The second chamber is located below the first chamber, and the internal diameter of the second chamber is larger than the maximum diameter of the sealing piston. The top end of the drive shaft is provided with a connecting groove, and the bottom shape of the central shaft matches the internal shape of the connecting groove.

[0007] Preferably, the driving mechanism includes: a drive motor; The drive motor is positioned above the first-stage isotope chamber, and the output shaft of the drive motor is connected to the top of the uppermost transmission shaft.

[0008] Preferably, the control mechanism includes: a ground controller, a main control circuit, and a revolution detection mechanism; The main control circuit is installed above the drive motor, and the main control circuit is connected to the ground controller, the drive motor and the rotation speed detection mechanism respectively; The rotation speed detection mechanism is connected to the drive motor, and the rotation speed detection mechanism is used to detect the rotation speed of the drive motor and transmit it to the main control circuit.

[0009] Preferably, the rotation detection mechanism includes: a Hall sensor and a permanent magnet; The permanent magnet is mounted on the side wall of the output shaft of the drive motor, and the Hall sensor is mounted on the inner side wall of the limit release head corresponding to the position of the permanent magnet. The Hall sensor is connected to the main control circuit.

[0010] Preferably, the drive motor and the main control circuit are provided with a sealed housing, and the bottom end of the sealed housing is connected to the top end of the uppermost limit release mechanism.

[0011] According to one aspect of this disclosure, a multi-stage controllable isotope release method is provided, comprising: A multi-stage controllable isotope release device is connected below the logging instrument, wherein the number of stages of the isotope chamber is the same as the number of times isotopes are released downhole. The multi-stage controllable isotope release device is lowered to the predetermined release location in the well using a logging cable; The isotope release process is as follows: the control mechanism controls the drive mechanism to start, which drives the transmission mechanism in the isotope chamber to move downward to the predetermined position. The control mechanism controls the drive mechanism to close. When the transmission mechanism moves downward to the predetermined position, its bottom end is connected to the top end of the transmission mechanism in the next level isotope chamber. While the transmission mechanism is moving, it drives the sealed piston connected to it to move downward, so that the sealed piston moves away from the release hole on the side wall of the corresponding limit release mechanism, thus completing the isotope release. When releasing the next level of isotopes, the above isotope release process is repeated until all isotopes in all isotope chambers are released. Except for the first level of isotope chambers, the transmission mechanism in each of the lower levels of isotope chambers is driven downward to a predetermined position by the drive mechanism and the transmission mechanism in the upper levels of isotope chambers.

[0012] The present invention has at least the following beneficial effects: This disclosure proposes a multi-stage controllable isotope release device and its release method. By driving the transmission mechanism and the sealed piston in each isotope chamber in sequence through the drive mechanism, the problem of multi-stage controllable release of isotopes cannot be achieved in a single well run during injection well isotope logging operations is solved. Attached Figure Description

[0013] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the specification, serve to illustrate the technical solutions of this disclosure.

[0014] Figure 1 A schematic diagram of the structure of a multi-stage controllable isotope release device according to an embodiment of the present disclosure is shown; Figure 2 A schematic diagram of the drive mechanism and control mechanism according to an embodiment of the present disclosure is shown; Figure 3 A schematic diagram of the structure of the first-stage isotope chamber and its transmission mechanism according to an embodiment of the present disclosure is shown.

[0015] In the figure, 1-isotope chamber, 2-drive mechanism, 3-control mechanism, 4-main control circuit, 5-drive motor, 6-Hall sensor, 7-output shaft, 8-upper limit release head, 9-drive shaft, 10-upper sealing piston, 11-central shaft, 12-lower sealing piston, 13-lower limit release head, 14-connecting groove, 15-first chamber, 16-second chamber. Detailed Implementation

[0016] Various exemplary embodiments, features, and aspects of this disclosure will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0017] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0018] In this document, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0019] Furthermore, to better illustrate this disclosure, numerous specific details are set forth in the following detailed description. Those skilled in the art will understand that this disclosure can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art have not been described in detail in order to highlight the main points of this disclosure.

[0020] Figure 1 A schematic diagram of the structure of a multi-stage controllable isotope release device according to an embodiment of the present disclosure is shown; Figure 2 A schematic diagram of the drive mechanism and control mechanism according to an embodiment of the present disclosure is shown; Figure 3 A schematic diagram of the structure of a first-stage isotope chamber and its transmission mechanism according to an embodiment of the present disclosure is shown. Figure 1-3As shown, a multi-stage controllable isotope release device includes: several stages of isotope chambers 1; the top and bottom of each isotope chamber 1 are respectively connected to limiting release mechanisms, and the limiting release mechanism at the bottom of the upper stage isotope chamber 1 is connected to the limiting release mechanism at the top of the lower stage isotope chamber 1; the limiting release mechanism has a release hole on its side wall, and the interior of the limiting release mechanism is connected to the interior of the isotope chamber 1; a transmission mechanism is provided inside each isotope chamber 1, and the top of the transmission mechanism of the first stage isotope chamber 1 is connected to a drive mechanism 2. In the initial state, the transmission mechanisms inside each stage of isotope chamber 1 are disconnected; a sealing piston for sealing the release hole is provided inside the limiting release mechanism, and the sealing piston is connected to the transmission mechanism; the drive mechanism 2 is connected to a control mechanism 3, and the control mechanism 3 is used to control the drive mechanism 2 to start, and drive the sealing piston connected to it to move downward to a predetermined position through the transmission mechanism. When the predetermined position is reached, the bottom of the transmission mechanism is connected to the top of the transmission mechanism in the next stage isotope chamber 1, and the control mechanism 3 controls the drive mechanism 2 to close.

[0021] In this embodiment, the multi-stage controllable isotope release device is provided with a total of four isotope chambers 1. Each isotope chamber 1 is interconnected by a limiting release mechanism connected to its top and bottom. The top of each isotope chamber 1 is connected to a drive mechanism 2. The interior of each isotope chamber 1 is connected to the interior of the limiting release mechanism connected to its top and bottom. The transmission mechanism in each isotope chamber 1 is connected to the sealing piston inside the limiting release mechanism connected to the top and bottom of that isotope chamber 1. A release hole is provided on the side wall of the limiting release mechanism. In the initial state, the position of the sealing piston in each limiting release mechanism overlaps with the position of the release hole, and the side wall of the sealing piston fits against the inner side wall of the limiting release mechanism, thereby sealing the release hole.

[0022] During well logging, the isotope release device is connected to the bottom of the logging instrument, and the logging instrument and isotope release device are lowered into the well to the predetermined release position via the logging cable.

[0023] During the first release of the isotope source, control mechanism 3 activates drive mechanism 2, which, through the transmission mechanism within the uppermost first-stage isotope chamber 1, drives the sealing piston within the limiting release mechanism connected to the upper and lower parts of the first-stage isotope chamber 1 to move downwards. As the sealing piston moves downwards, it gradually moves away from the release hole. Fluid in the oil pipe flows from top to bottom, entering the first-stage isotope chamber 1 through the release hole of the limiting release mechanism connected to the top of the first-stage isotope chamber 1. This pushes the isotope source within the first-stage isotope chamber 1 out through the release hole on the side wall of the limiting release mechanism connected to the bottom of the first-stage isotope chamber 1, completing the first release of the isotope source.

[0024] When the control mechanism 3 detects that the sealed piston corresponding to the first-stage isotope chamber 1 moves downward to the predetermined position, the control drive mechanism 2 is closed. At this time, the bottom end of the transmission mechanism in the first-stage isotope chamber 1 is connected to the top end of the transmission mechanism in the second-stage isotope chamber 1.

[0025] During the second release of the isotope source, the testing instrument is raised to the predetermined release position downhole. Control mechanism 3 activates drive mechanism 2. Since the primary transmission mechanism in the first-stage isotope chamber 1 and the secondary transmission mechanism in the second-stage isotope chamber 1 are now connected, drive mechanism 2 transmits power to the secondary transmission mechanism via the primary transmission mechanism. The secondary transmission mechanism drives the sealed piston in the limiting release mechanism connected to the upper and lower parts of the second-stage isotope chamber 1 downwards, away from the release hole. Fluid in the tubing enters the second-stage isotope chamber 1 through the release hole of the limiting release mechanism connected to the top, pushing the isotope source out of the limiting release mechanism sidewall connected to the bottom of the second-stage isotope chamber 1, completing the second isotope source release. Control mechanism 3 detects when the sealed piston corresponding to the second-stage isotope chamber 1 moves downwards to the predetermined position and controls drive mechanism 2 to close.

[0026] This process is repeated sequentially to complete the release operations of the third-level isotope chamber 1 and the fourth-level isotope chamber 1. Different amounts of isotope sources can be added to each isotope chamber 1 to accommodate different amounts of isotope released each time.

[0027] In this disclosure, the limiting release mechanism includes: a limiting release head; the limiting release head has a first chamber 15 inside; a sealing piston is located inside the first chamber 15, the first chamber 15 has a release hole on its inner sidewall, and the sidewall of the sealing piston is in contact with the inner sidewall of the first chamber 15; the bottom end of the uppermost limiting release head is connected to the first-stage isotope chamber 1, and the top end is connected to the driving mechanism 2; the interior of the isotope chamber 1 communicates with the interior of the first chamber 15.

[0028] In this embodiment, after the drive mechanism 2 is activated, the connected sealing piston is driven by the transmission mechanism to move downward along the inner wall of the first chamber 15. The top and bottom of the first chamber 15 are open. When the sealing piston moves to the inside of the isotope chamber 1 below the first chamber 15, the inside of the oil pipe is connected to the first chamber 15 of the limiting release head through the release hole. The first chamber 15 is connected to the isotope chamber 1 connected to the limiting release head, so that the isotope source in the isotope chamber 1 can enter the oil pipe.

[0029] In this disclosure, the transmission mechanism includes: a transmission shaft 9 and a central shaft 11; the sealing piston in the limiting release mechanism connected to the top of the isotope chamber 1 is an upper sealing piston 10, and the sealing piston in the limiting release mechanism connected to the bottom is a lower sealing piston 12; the central shaft 11 is located inside the isotope chamber 1, the top of the central shaft 11 is connected to the upper sealing piston 10, and the top of the upper sealing piston 10 is connected to the bottom of the transmission shaft 9 via a threaded structure; the sidewall of the central shaft 11 is connected to the lower sealing piston 12, and the bottom of the central shaft 11 is located at the lower sealing piston 12. Below 2; the upper sealing piston 10 and the lower sealing piston 12 each have a limiting pin on their side walls, and the first chamber 15 has a limiting groove on its inner side wall, with the limiting pin inside the limiting groove; the limiting release head has a second chamber 16 communicating with the first chamber 15, the second chamber 16 being below the first chamber 15, and the inner diameter of the second chamber 16 being larger than the maximum diameter of the sealing piston; the top end of the transmission shaft 9 is provided with a connecting groove 14, and the bottom shape of the central shaft 11 matches the inner shape of the connecting groove 14.

[0030] In this embodiment, the top of the upper sealing piston 10 has a groove, the bottom end of the drive shaft 9 is inserted into the groove, and the drive shaft 9 has mating threaded structures on the side wall near the bottom end and on the inner wall of the groove. The top end of the drive shaft 9 of the transmission mechanism in the first-stage isotope chamber 1 is connected to the drive mechanism 2.

[0031] The inner wall of the first chamber 15 of the limiting release head has a limiting groove extending downward to the bottom of the first chamber 15, and the bottom of the limiting groove is open.

[0032] The limit release head connected to the top of the isotope chamber 1 is the upper limit release head 8, and the limit release head connected to the bottom of the isotope chamber 1 is the lower limit release head 13.

[0033] During the first release of the isotope source, the control mechanism 3 activates the drive mechanism 2, causing the drive shaft 9 of the transmission mechanism within the first-stage isotope chamber 1 to rotate. This rotation, through the engagement of the limiting pin of the upper sealing piston 10 with the limiting groove on the inner wall of the first chamber 15, and the threaded engagement of the drive shaft 9 with the top groove of the upper sealing piston 10, causes the upper sealing piston 10 and its limiting pin to move downwards along the limiting groove. As the upper sealing piston 10 moves downwards, it drives the central shaft 11 connected to its bottom end to move downwards, which in turn drives the lower sealing piston 12 to move downwards. When the upper sealing piston 10 and the lower sealing piston 12 move downwards into their corresponding lower second chamber 16, the limiting pins of the upper sealing piston 10 and the lower sealing piston 12 disengage from the limiting groove. At this point, the sealing pistons have reached their predetermined positions, and the control mechanism 3 shuts down the drive mechanism 2. The fluid in the well enters through the release hole of the upper limit release head 8 connected to the first-stage isotope chamber 1, and pushes the isotope source in the first-stage isotope chamber 1 out from the release hole of its lower limit release head 13, thus completing one release.

[0034] In the initial state, the bottom end of the central shaft 11, located in the lower limit release head 13 connected to the first-stage isotope chamber 1, is at a certain distance from the transmission shaft 9 in the upper limit release head 8 connected to the next stage, i.e., the second-stage isotope chamber 1. As the central shaft 11 gradually moves downward, the bottom end of the central shaft 11 gradually inserts into the top end connecting groove 14 of the transmission shaft 9 in the upper limit release head 8 connected to the next stage, i.e., the second-stage isotope chamber 1, thereby completing the docking of the transmission mechanism within the first and second-stage isotope chambers 1.

[0035] During the second release of the isotope source, the control mechanism 3 controls the drive mechanism 2 to start. The drive mechanism 2 drives the transmission shaft 9 in the upper limit release head 8 connected to the first-stage isotope chamber 1 to rotate. Since the upper sealing piston 10 and the lower sealing piston 12 in the limit release head connected to the first-stage isotope chamber 1 are already inside its second chamber 16, and its limit pin has disengaged from the limit groove, when the transmission shaft 9 of the first-stage isotope chamber 1 rotates, it will drive the upper sealing piston 10 and the central shaft 11 connected to it to rotate. Therefore, at this time, the bottom end of the central shaft 11 of the first-stage isotope chamber 1 has been inserted into the transmission shaft 9 connecting groove 14 in the upper limit release head 8 connected to the second-stage isotope chamber 1, thereby driving the transmission shaft 9 in the upper limit release head 8 connected to the second-stage isotope chamber 1 to rotate.

[0036] When the transmission shaft 9 inside the upper limit release head 8 connected to the second-stage isotope chamber 1 rotates, it engages with the upper sealing piston 10 connected to its bottom end via a threaded connection. The limiting pin of the upper sealing piston 10 engages with the limiting groove, thereby driving the upper sealing piston 10, the central shaft 11, and the lower sealing piston 12 to move downwards. After the limiting pins of the upper sealing piston 10 and the lower sealing piston 12 disengage downwards from the limiting groove and enter the second chamber 16, the fluid in the well enters through the release hole of the upper limit release head 8 connected to the second-stage isotope chamber 1, pushing the isotope source in the second-stage isotope chamber 1 out from the release hole of its lower limit release head 13, completing the secondary release.

[0037] After the sealed piston in the limit release head connected to the second-stage isotope chamber 1 moves to the predetermined position, the bottom end of the central shaft 11 in the second-stage isotope chamber 1 is inserted into the upper end connecting groove 14 of the transmission shaft 9 in the upper limit release head 8 connected to the next stage, i.e., the third-stage isotope chamber 1, completing the connection with the next stage. When the third release is performed, the drive mechanism 2 is activated, which drives the central shaft 11 and the sealed piston in the third-stage isotope chamber 1 to move downward through the transmission mechanism in the first and second-stage isotope chambers 1, thereby completing the three releases. The release of all stages of isotope chambers 1 is completed in this way.

[0038] In this disclosure, the drive mechanism 2 includes a drive motor 5; the drive motor 5 is positioned above the first-stage isotope chamber 1, and the output shaft 7 of the drive motor 5 is connected to the top end of the uppermost transmission shaft 9.

[0039] In this disclosure, the control mechanism 3 includes: a ground controller, a main control circuit 4, and a rotational speed detection mechanism; the main control circuit 4 is installed above the drive motor 5, and the main control circuit 4 is connected to the ground controller, the drive motor 5, and the rotational speed detection mechanism; the rotational speed detection mechanism is connected to the drive motor 5, and the rotational speed detection mechanism is used to detect the rotational speed of the drive motor 5 and transmit it to the main control circuit 4.

[0040] In this embodiment, when the isotope source is released, the ground controller sends a release signal to the main control circuit 4. Upon receiving the release signal, the main control circuit 4 controls the drive motor 5 and the rotation detection mechanism to start. After the drive motor 5 starts, its output shaft 7 drives the connecting shaft of the transmission mechanism inside the first-stage isotope chamber 1 to rotate, thereby driving the central shaft 11 and the sealing piston to move. After the rotation detection mechanism starts, it detects the real-time rotation of the drive motor 5 and transmits it to the main control circuit 4. The main control circuit 4 determines that when the real-time rotation is equal to the predetermined rotation, it controls the drive motor 5 to shut down. At this time, the sealing piston of the first-stage isotope chamber 1 has moved downward into the second chamber 16, completing the first release. Simultaneously, the bottom end of the central shaft 11 of the first-stage isotope chamber 1 is inserted into the connecting groove 14 at the top end of the connecting shaft of the transmission mechanism inside the second-stage isotope chamber 1, completing the docking with the next stage.

[0041] During the second release, the ground controller sends a release signal to the main control circuit 4. The main control circuit 4 controls the drive motor 5 to start, which drives the drive shaft 9 of the second-stage isotope chamber 1 to rotate via the drive shaft 9 and the central shaft 11 of the first-stage isotope chamber 1. This causes the central shaft 11 and the sealing piston of the second-stage isotope chamber 1 to move downwards. At the same time, the rotation detection mechanism detects the real-time rotation number again when the drive motor 5 starts and transmits it to the main control circuit 4. When the main control circuit 4 determines that the real-time rotation number of the drive motor 5 at the second start is equal to the predetermined rotation number, it controls the drive motor 5 to shut down, thus completing the second release and docking with the drive mechanism of the third-stage isotope chamber 1. This process is repeated, with the drive motor 5 controlled to rotate to the predetermined rotation number and then stop, so that the central shaft 11 in each stage of the isotope chamber 1 drives the sealing piston to the predetermined position, thus completing the release and docking in sequence.

[0042] The main control circuit 4 is based on a microcontroller and includes a rotation speed detection circuit, a drive motor 5 start / stop control circuit, and a signal transmission circuit. It is used to record, analyze, correct, and control the start / stop of the drive motor 5, and to upload relevant data to the ground controller. If the drive motor 5 malfunctions during operation, it will be detected and its operating parameters automatically corrected upon the next controller startup.

[0043] In this disclosure, the rotation detection mechanism includes: a Hall sensor 6 and a permanent magnet; the permanent magnet is mounted on the side wall of the output shaft 7 of the drive motor 5, and the Hall sensor 6 is mounted on the inner side wall of the limit release head corresponding to the position of the permanent magnet; the Hall sensor 6 is connected to the main control circuit 4.

[0044] In this embodiment, when the drive motor 5 starts, its output shaft 7 rotates, driving the permanent magnet to move. When the permanent magnet moves close to the Hall sensor 6, that is, when the permanent magnet is between the Hall sensor 6 and the output shaft 7, its S-pole side faces the Hall sensor 6. The Hall sensor 6 generates a positive voltage signal and transmits it to the main control circuit 4. When the permanent magnet rotates away from the Hall sensor 6 with the output shaft 7, that is, when the output shaft 7 is between the Hall sensor 6 and the permanent magnet, its N-pole side faces the Hall sensor 6. The Hall sensor 6 emits a negative voltage signal and transmits it to the main control circuit 4. The main control circuit 4 determines one revolution of the output shaft 7 based on the received set of positive and negative voltage signals, that is, the real-time rotation of the motor increases by one. When the number of revolutions of the output shaft 7 is equal to the predetermined number of revolutions, the main control circuit 4 controls the drive motor 5 to turn off.

[0045] In this disclosure, the drive motor and the main control circuit 4 are provided with a sealed housing, and the bottom end of the sealed housing is connected to the top end of the uppermost limit release mechanism.

[0046] In this embodiment of the disclosure, the sealed housing is used to seal the main control circuit 4 and the drive motor 5 to prevent well fluid from entering.

[0047] This disclosure also proposes a multi-stage controllable isotope release method, including: Step 1: Connecting the multi-stage controllable isotope release device to the bottom of the logging instrument, wherein the number of stages set in the isotope chamber 1 is the same as the number of times the isotope is released downhole.

[0048] In this embodiment, different amounts of isotope source are injected through the filling holes of each isotope chamber 1 according to the amount of isotope source required for each release. The main control circuit 4, drive motor 5, first-stage isotope chamber 1, second-stage isotope chamber 1, third-stage isotope chamber 1, and fourth-stage isotope chamber 1 are sequentially connected through the upper and lower limit release heads 13.

[0049] Step 2: Lower the multi-stage controllable isotope release device to the predetermined release location downhole via a logging cable.

[0050] In this embodiment of the disclosure, in accordance with the construction design requirements, the isotope release device is lowered to the bottom of the measuring well section, and then isotopes are released sequentially upwards from the bottom of the measuring well section.

[0051] Step 3: The isotope release process is as follows: the control mechanism 3 controls the drive mechanism 2 to start, which drives the transmission mechanism in the isotope chamber 1 to move downward to the predetermined position. The control mechanism 3 controls the drive mechanism 2 to close. When the transmission mechanism moves downward to the predetermined position, its bottom end is connected to the top end of the transmission mechanism in the next level isotope chamber 1. While the transmission mechanism is moving, it drives the sealed piston connected to it to move downward, so that the sealed piston moves away from the release hole on the side wall of the corresponding limit release mechanism, thus completing the isotope release. When releasing the next level of isotopes, the above isotope release process is repeated until all isotopes in all isotope chambers 1 are released. Among them, except for the first level of isotope chamber 1, the transmission mechanism in each of the lower levels of isotope chamber 1 is driven by the drive mechanism 2 and the transmission mechanism in each of the upper levels of isotope chamber 1 to move downward to the predetermined position.

[0052] In this embodiment, during the first release of the isotope source, the ground controller sends a release signal to the main control circuit 4. Upon receiving the release signal, the main control circuit 4 controls the drive motor 5 and the Hall sensor 6 to start. After the drive motor 5 starts, it drives the transmission shaft 9 in the upper limit release head 8 connected to the first-stage isotope chamber 1 to rotate. Through the engagement of the limit pin and the limit groove, and the threaded engagement of the transmission shaft 9 and the upper sealing piston 10, the upper sealing piston 10, the central shaft 11, and the lower sealing piston 12 move downward. After the Hall sensor 6 starts, it transmits the detected positive and negative electrical signals of the permanent magnet to the main control circuit 4. Based on the received positive and negative voltage signals, the main control circuit 4 determines that when the real-time rotation speed of the motor is equal to the predetermined rotation speed, it controls the drive motor 5 to shut down. The fluid in the well enters through the release hole of the upper limit release head 8 connected to the first-stage isotope chamber 1, pushing the isotope source in the first-stage isotope chamber 1 out from the release hole of the lower limit release head 13 connected to the first-stage isotope chamber 1, completing one release.

[0053] At this time, the upper sealing piston 10 and lower sealing piston 12 corresponding to the first-stage isotope chamber 1 move downwards to the corresponding second chamber 16, i.e., the predetermined position. The bottom end of the central shaft 11 inside the first-stage isotope chamber 1 is gradually inserted into the top connecting groove 14 of the transmission shaft 9 inside the upper limit release head 8 connected to the second-stage isotope chamber 1, completing the docking of the transmission mechanism of the first-stage isotope chamber 1 and the next stage, i.e., the transmission mechanism of the second-stage isotope chamber 1.

[0054] The isotope release device is raised to the second release position downhole. During the second release of the isotope source, the surface controller sends a release signal to the main control circuit 4. The main control circuit 4 controls the drive motor 5 to start. Since the limiting pins of the upper sealing piston 10 and lower sealing piston 12 corresponding to the first-stage isotope chamber 1 have disengaged from the limiting groove, the drive motor 5 drives the drive shaft 9 in the upper limit release head 8 connected to the second-stage isotope chamber 1 to rotate through the transmission shaft 9 and central shaft 11 corresponding to the first-stage isotope chamber 1. Through the threaded engagement between the transmission shaft 9 and the upper sealing piston 10, the central shaft 11 and the upper and lower sealing pistons 12 of the second-stage isotope chamber 1 move downward. At the same time, the Hall sensor 6 detects the real-time rotation number again when the drive motor 5 starts and transmits it to the main control circuit 4. When the main control circuit 4 determines that the real-time rotation number of the drive motor 5 during the second start is equal to the predetermined rotation number, it controls the drive motor 5 to shut down. Fluid enters the well through the release hole of the upper limit release head 8 connected to the second-stage isotope chamber 1, pushing the isotope source in the second-stage isotope chamber 1 out through the release hole of the lower limit release head 13 connected to the second-stage isotope chamber 1, completing the secondary release. At this time, the bottom end of the central shaft 11 in the second-stage isotope chamber 1 is connected to the top end of the transmission shaft 9 of the transmission mechanism of the third-stage isotope chamber 1. This process continues, each time the drive motor 5 is started, it is controlled to rotate to a predetermined number of revolutions and then stop, so that the central shaft 11 in each stage of the isotope chamber 1 drives the sealing piston to move to a predetermined position, sequentially completing the release and docking with the transmission mechanism of the next stage of the isotope chamber 1, until the isotope release of all isotope chambers 1 is completed.

[0055] This disclosure, based on the main control circuit 4 and Hall sensor 6, in conjunction with a precision transmission mechanism, controls the multiple release of isotopes, solving the problems of the inability to achieve multi-stage controllable release of isotopes in a single well run during isotope logging operations in injection wells, the inability to monitor the working status of the downhole releaser in real time and correct abnormal situations, and the low stability of multi-stage release.

[0056] The main control circuit 4 detects the rotation speed of the drive motor 5, controls its start and stop, and uploads the working status of the downhole drive motor 5 back to the surface control system in real time. This allows for correction of any abnormal motor operation, achieving real-time controllability. Simultaneously, the drive motor 5, in conjunction with the transmission mechanism of the lower isotope chamber 1, sequentially controls the opening and release of isotopes from each level of the chamber 1, enabling real-time, precise, and controllable release of multiple levels and varying amounts of isotopes from the downhole isotope chamber 1.

[0057] It is understood that the various method embodiments mentioned above in this disclosure can be combined with each other to form combined embodiments without violating the principle and logic. Due to space limitations, this disclosure will not elaborate further.

[0058] Those skilled in the art will understand that, in the above-described method of the specific implementation, the order in which each step is written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0059] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A multi-stage controllable isotope release device, characterized in that, include: Several levels of isotope storage (1); The top and bottom of the isotope chamber (1) are respectively connected to the limiting release mechanism, and the limiting release mechanism at the bottom of the upper-level isotope chamber (1) is connected to the limiting release mechanism at the top of the lower-level isotope chamber (1). The limiting release mechanism has a release hole on its side wall, and the interior of the limiting release mechanism is connected to the interior of the isotope chamber (1); The isotope chamber (1) is equipped with a transmission mechanism. The top of the transmission mechanism of the first-level isotope chamber (1) is connected to the drive mechanism (2). In the initial state, the transmission mechanisms inside each level of the isotope chamber (1) are disconnected. The limiting release mechanism is equipped with a sealing piston for sealing the release hole, and the sealing piston is connected to the transmission mechanism; The limiting release mechanism includes: a limiting release head; the limiting release head has a first chamber (15) inside; a sealing piston is located inside the first chamber (15), the inner side wall of the first chamber (15) has a release hole, and the side wall of the sealing piston is in contact with the inner side wall of the first chamber (15); the bottom end of the uppermost limiting release head is connected to the first-stage isotope chamber (1), and the top end is connected to the drive mechanism (2); the interior of the isotope chamber (1) is in communication with the interior of the first chamber (15); The transmission mechanism includes: a transmission shaft (9) and a central shaft (11); the sealing piston in the limiting release mechanism connected to the top of the isotope chamber (1) is the upper sealing piston (10), and the sealing piston in the limiting release mechanism connected to the bottom is the lower sealing piston (12); the central shaft (11) is located inside the isotope chamber (1), the top of the central shaft (11) is connected to the upper sealing piston (10), and the top of the upper sealing piston (10) is connected to the bottom of the transmission shaft (9) through a threaded structure; the side wall of the central shaft (11) is connected to the lower sealing piston (12), and the bottom of the central shaft (11) is located in the lower sealing... Below the piston (12); the upper sealing piston (10) and the lower sealing piston (12) have limiting pins on their side walls respectively, and the inner side wall of the first chamber (15) has a limiting groove, with the limiting pin inside the limiting groove; the limiting release head has a second chamber (16) communicating with the first chamber (15), the second chamber (16) is below the first chamber (15), and the inner diameter of the second chamber (16) is greater than the maximum diameter of the sealing piston; the top of the drive shaft (9) is provided with a connecting groove (14), and the bottom shape of the central shaft (11) matches the inner shape of the connecting groove (14); The drive mechanism (2) is connected to the control mechanism (3). The control mechanism (3) is used to control the drive mechanism (2) to start. The drive mechanism (2) drives the sealed piston connected to it to move downward to a predetermined position through the transmission mechanism. When the predetermined position is reached, the bottom end of the transmission mechanism is connected to the top end of the transmission mechanism in the next level isotope chamber (1). The control mechanism (3) controls the drive mechanism (2) to close. The movement to the predetermined position includes: the upper sealing piston and its limiting pin moving downward along the limiting groove through the threaded engagement of the drive shaft with the top groove of the upper sealing piston; when the upper sealing piston moves downward, it drives the central shaft connected at the bottom to move downward, and the central shaft drives the lower sealing piston to move downward; when the upper sealing piston and the lower sealing piston move downward to the corresponding second chamber located below, the limiting pins of the upper sealing piston and the lower sealing piston disengage downward from the limiting groove, at which point the sealing piston has moved to the predetermined position.

2. The multi-stage controllable isotope release device according to claim 1, characterized in that, The drive mechanism (2) includes: a drive motor (5); The drive motor (5) is positioned above the first-stage isotope chamber (1), and the output shaft (7) of the drive motor (5) is connected to the top of the transmission shaft (9) located at the top.

3. The multi-stage controllable isotope release device according to claim 2, characterized in that, The control mechanism (3) includes: a ground controller, a main control circuit (4), and a rotational speed detection mechanism; The main control circuit (4) is installed above the drive motor (5), and the main control circuit (4) is connected to the ground controller, the drive motor (5) and the rotation detection mechanism respectively; The rotation detection mechanism is connected to the drive motor (5), and the rotation detection mechanism is used to detect the rotation of the drive motor (5) and transmit it to the main control circuit (4).

4. The multi-stage controllable isotope release device according to claim 3, characterized in that, The rotational speed detection mechanism includes: a Hall sensor (6) and a permanent magnet; The permanent magnet is mounted on the side wall of the output shaft (7) of the drive motor (5), and the Hall sensor (6) is mounted on the inner side wall of the limit release head corresponding to the position of the permanent magnet. The Hall sensor (6) is connected to the main control circuit (4).

5. The multi-stage controllable isotope release device according to claim 3 or 4, characterized in that: The drive motor and the main control circuit (4) are provided with a sealed housing, and the bottom of the sealed housing is connected to the top of the uppermost limit release mechanism.

6. A multi-stage controllable isotope release method, implemented using the multi-stage controllable isotope release device as described in any one of claims 1-5, characterized in that, include: A multi-stage controllable isotope release device is connected below the logging instrument, wherein the number of stages of the isotope chamber (1) is the same as the number of times the isotope is released downhole; The multi-stage controllable isotope release device is lowered to the predetermined release location in the well using a logging cable; The isotope release process is as follows: the control mechanism (3) controls the drive mechanism (2) to start, which drives the transmission mechanism in the isotope chamber (1) to move downward to the predetermined position. The control mechanism (3) controls the drive mechanism (2) to close. When the transmission mechanism moves downward to the predetermined position, its bottom end is connected to the top end of the transmission mechanism in the next level isotope chamber (1). While the transmission mechanism is moving, it drives the sealed piston connected to it to move downward, so that the sealed piston moves away from the release hole on the side wall of the corresponding limit release mechanism, thus completing the isotope release. When releasing the next level of isotopes, the above isotope release process is repeated until all isotopes in all isotope chambers (1) are released. Among them, except for the first level of isotope chamber (1), the transmission mechanism in each of the lower levels of isotope chambers (1) is driven to move downward to the predetermined position by the drive mechanism (2) and the transmission mechanism in each of the upper levels of isotope chambers (1).

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