Well logging radioactive source release device

Abstract

The application provides a well logging radioactive source releasing device and relates to the technical field of oil well logging equipment. The well logging radioactive source releasing device comprises a cylinder assembly, a flow limiting assembly, a top rod piston and a grabbing assembly. The cylinder assembly is internally provided with hydraulic oil. The flow limiting assembly is installed in the cylinder assembly and divides the cylinder assembly into a first oil cavity and a second oil cavity. The flow limiting assembly is used for limiting the flow rate of the hydraulic oil flowing between the first oil cavity and the second oil cavity. The top rod piston is at least partially arranged in the cylinder assembly and jointly forms the first oil cavity with the flow limiting assembly. The grabbing assembly is installed on one end of the cylinder assembly close to the top rod piston and comprises a plurality of folded elastic clamping jaws. According to the technical scheme, the releasing of the grabbing assembly does not need manual intervention, the radiation damage to the operator is reduced, and the flow limiting assembly limits the flow rate of the hydraulic oil, thereby avoiding the opening of the grabbing assembly when the grabbing assembly meets resistance and does not reach the preset position, and the occurrence of the false releasing of the well logging radioactive source.

Description

Technical Field

[0001] This invention relates to the field of oil well logging equipment technology, and particularly to a well logging radioactive source release device. Background Technology

[0002] A radioactive source is a general term for a radiation source made from radioactive materials. The strength of a radioactive source is generally indicated by the activity of the radioactive nuclide it contains, but it can also be indicated by its emissivity or flux rate. Conventionally, high-activity or high-emissivity radioactive sources used in non-destructive testing, radiotherapy, and radiation treatment are called radioactive sources. Radiation application technologies based on radioactive sources have wide applications in industry, agriculture, medicine, resources, environment, military, and scientific research. Radioactive sources can be classified according to the type of radiation they emit, such as alpha, beta, gamma, and neutron sources; and according to their packaging method, they can be classified as sealed radioactive sources (radioactive materials sealed in a shell that meets certain requirements) and unsealed radioactive sources (radioactive materials without a shell). The vast majority of industrial, agricultural, and medical radioactive sources are sealed radioactive sources.

[0003] Radioactive sources are also used in oil well logging equipment. Currently, the handling of radioactive sources is mostly done manually by wearing protective clothing and operating close to the body. This involves taking the radioactive source out of the source container and placing it into the logging instrument, and vice versa. However, due to the lack of a dedicated radioactive source release device, the actual operation of radioactive sources is very inconvenient. Radiation damage to operators is unavoidable, and there are certain safety hazards in case of tool failure. Summary of the Invention

[0004] To address the problems in the prior art, this application proposes a logging radioactive source release device to release the logging radioactive source, facilitating actual operation of the radioactive source and reducing radiation damage to operators.

[0005] This invention provides a logging radioactive source release device, the logging radioactive source release device comprising:

[0006] A cylinder assembly, wherein hydraulic oil is provided inside the cylinder assembly;

[0007] A flow-limiting component, installed within the cylinder assembly and dividing the cylinder assembly into a first oil chamber and a second oil chamber, the flow-limiting component being used to restrict the flow rate of hydraulic oil flowing between the first oil chamber and the second oil chamber; and

[0008] A push rod piston, at least partially disposed within the cylinder assembly, which, together with the flow-limiting assembly, forms the first oil chamber; and

[0009] A gripping assembly is mounted on the cylinder assembly near one end of the push rod piston. The gripping assembly includes a plurality of retractable elastic claws. The push rod piston can move under the action of the hydraulic oil flowing into the first oil chamber and squeeze the elastic claws outward, so that the retracted elastic claws open outward.

[0010] As a further improvement to the above technical solution:

[0011] The aforementioned logging radioactive source release device further includes a gripping assembly that includes an installation cylinder. The end of the installation cylinder is provided with a plurality of elastic claws spaced apart circumferentially. The inner wall of the elastic claws has an outwardly protruding squeezing part, and the side of the squeezing part facing the push rod piston is constructed as an inclined surface.

[0012] Furthermore, in the aforementioned logging radioactive source release device, the contact surface between the elastic claw and the outer wall of the mounting cylinder is serrated.

[0013] The aforementioned logging radioactive source release device further includes a cylinder assembly comprising a cylinder body, a cylinder liner, and a piston assembly. The cylinder liner is fixedly nested within the cylinder body, and the piston assembly is disposed within the cylinder liner, which, together with the flow limiting assembly, constitutes the second oil chamber.

[0014] In the aforementioned logging radioactive source release device, at least one sealing gasket is provided between the two ends of the cylinder liner and the cylinder body.

[0015] The aforementioned logging radioactive source release device further includes a flow-limiting component comprising a plug and a valve needle. The plug is fixedly nested within the cylinder and abuts against the end of the cylinder liner. The valve needle is fixedly nested within the plug and is clearance-fitted with the plug.

[0016] In the aforementioned logging radioactive source release device, at least one sealing gasket is provided between the plug and the cylinder.

[0017] The aforementioned logging radioactive source release device further includes a flow limiting component that is installed on the inner wall of the cylinder and abuts against the plug to limit the plug.

[0018] The aforementioned logging radioactive source release device further includes a flow-limiting component that includes a filter element, which is fixedly disposed inside the plug and used to filter the hydraulic oil flowing through the flow-limiting component.

[0019] The aforementioned logging radioactive source release device further includes a centralizing sleeve disposed at the end of the cylinder body, wherein a connector is provided inside the centralizing sleeve, the first end of the connector being connected to an external cable head and the second end being connected to the piston assembly.

[0020] The above-mentioned technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present invention can be achieved.

[0021] The well logging radioactive source release device provided by this invention has at least the following advantages compared with the prior art: In use, a weighted rod is connected to the upper part of the well logging radioactive source release device, and the piston of the cylinder assembly is connected to the cable. The well logging radioactive source release device is suspended on the cable until the gripping assembly contacts the well logging radioactive source to be gripped. Under the gravity of the upper tool string, multiple retracted elastic claws open to grip the well logging radioactive source. After gripping the well logging radioactive source, the cable is pulled, and the piston moves upward relative to the cylinder, causing the hydraulic oil in the first oil chamber to return through the flow limiting assembly. The hydraulic oil flows into the second oil chamber, where the elastic claws retract and ultimately remove the logging radioactive source retrieval device. During release, the piston, under the influence of gravity, moves downward relative to the cylinder of the cylinder assembly, squeezing the hydraulic oil in the second oil chamber through the flow-limiting component into the first oil chamber, driving the push rod piston downward. This causes the multiple retracted elastic claws to open and release the logging radioactive source. Once the elastic claws release the logging radioactive source, the cable is pulled, and the piston moves upward relative to the cylinder, causing the hydraulic oil in the first oil chamber to flow back into the second oil chamber through the flow-limiting component. The elastic claws then retract and ultimately remove the logging radioactive source release device. Using this logging radioactive source release device, the release of the grabbing component does not require manual intervention, facilitating actual operation of the radioactive source and reducing radiation damage to operators. Furthermore, because the flow-limiting component restricts the flow of hydraulic oil between the first and second oil chambers, the hydraulic oil in the first oil chamber can only drive the elastic claws to open and complete the release of the radioactive source after the weight rod and the logging radioactive source release device have been stationary on top of the radioactive source for a period of time. This avoids the grabbing component opening when it encounters obstruction and has not reached the preset position, which could lead to the accidental release of the logging radioactive source.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0025] Figure 1 This shows a front view of the logging radioactive source release device provided in an embodiment of the present invention;

[0026] Figure 2 Showing Figure 1 Enlarged view of region A in the middle;

[0027] Figure 3 Showing Figure 1 Enlarged view of region B in the middle;

[0028] Figure 4 The image shows a right view of the logging radioactive source release device provided in an embodiment of the present invention.

[0029] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0030] Figure label:

[0031] 100-Well logging radioactive source release device; 110-Cylinder assembly; 111-Cylinder body; 112-Cylinder liner; 113-Centering sleeve; 114-Sealing gasket; 120-Piston assembly; 121-Connector; 122-Cylinder piston; 130-Flow limiting assembly; 131-Plug; 132-Valve needle; 133-Limiting element; 134-Filter element; 135-Three-screw bearing; 136-Elastic retaining ring; 140-Grabbing assembly; 141-Installation cylinder; 142-Top rod piston; 143-Elastic claw. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] The invention will now be further described with reference to the accompanying drawings.

[0038] This invention provides a well logging radioactive source release device 100 to grasp the well logging radioactive source, facilitating actual operation of the radioactive source and reducing radiation damage to operators.

[0039] like Figure 1As shown, the logging radioactive source release device 100 of this embodiment includes a cylinder assembly 110, a flow limiting assembly 130, a push rod piston 142, and a gripping assembly 140. The cylinder assembly 110 contains hydraulic oil. The flow limiting assembly 130 is installed in the cylinder assembly 110 and divides the cylinder assembly 110 into a first oil chamber and a second oil chamber. The flow limiting assembly 130 is used to limit the flow rate of the hydraulic oil flowing between the first oil chamber and the second oil chamber. The push rod piston 142 is at least partially disposed in the cylinder assembly 110, and together with the flow limiting assembly 130, it forms the first oil chamber. The gripping assembly 140 is installed on the cylinder assembly 110 near the end of the push rod piston 142. It includes a plurality of retractable elastic claws 143. The push rod piston 142 can move under the action of the hydraulic oil flowing into the first oil chamber and squeeze the elastic claws 143 outward, so that the retracted elastic claws 143 open outward.

[0040] In use, a weighted rod is connected to the upper part of the logging radioactive source release device 100, and the piston of the cylinder assembly 110 is connected to the cable. The logging radioactive source release device 100 is suspended on the cable until the gripping assembly 140 comes into contact with the logging radioactive source to be gripped. Under the action of gravity, multiple retractable elastic claws 143 open to grip the logging radioactive source. After the elastic claws 143 grip the logging radioactive source, the cable is pulled up, and the piston moves upward relative to the cylinder, so that the hydraulic oil in the first oil chamber flows back to the second oil chamber through the flow limiting assembly. The elastic claws retract and finally the logging radioactive source gripping device is taken out.

[0041] During release, the piston moves downward relative to the cylinder of the cylinder assembly 110 under the action of gravity, squeezing the hydraulic oil in the second oil chamber to flow through the flow limiting component 130 into the first oil chamber, driving the push rod piston 142 to move downward, causing multiple retracted elastic claws 143 to open to release the logging radiation source. After the elastic claws 143 release the logging radiation source, the cable rope is pulled up, and finally the logging radiation source release device is taken out.

[0042] Using this logging radioactive source release device, the release gripping component 140 does not require manual intervention, facilitating actual operation of the radioactive source and reducing radiation damage to operators. Furthermore, because the flow-limiting component 130 restricts the flow of hydraulic oil between the first and second oil chambers, the hydraulic oil in the first oil chamber can only drive the elastic claw 143 to open after the weight rod and the logging radioactive source release device have been stationary at the top of the radioactive source for a period of time, thereby completing the release of the radioactive source. This avoids the situation where the gripping component 140 opens due to obstruction before reaching the preset position, which could lead to the accidental release of the logging radioactive source.

[0043] The well logging radioactive source release device 100 provided in this embodiment of the invention is described in detail in the attached document. Figure 1 , Figure 3 as well as Figure 4 The gripping component 140 includes a mounting cylinder 141 and a plurality of cooperating elastic claws 143. The mounting cylinder 141 is mounted on the second end of the cylinder 111. One end of the plurality of elastic claws 143 is mounted circumferentially on the outer wall of the mounting cylinder 141. The first end of the push rod piston 142 is slidably and sealingly nested in the inner wall of the cylinder 111 between the flow limiting component 130 and the mounting cylinder 141. The second end of the push rod piston 142 passes through the mounting cylinder 141 to drive the plurality of elastic claws 143 to open.

[0044] During release, the connector 121 is connected to the cable rope, and the logging radioactive source release device 100 is suspended on the cable rope to the preset position of the logging radioactive source. Under the action of gravity, the piston moves downward relative to the cylinder of the cylinder assembly 110, squeezing the hydraulic oil in the second oil chamber to flow through the flow limiting component 130 into the first oil chamber, driving the push rod piston 142 to move downward, causing multiple retracted elastic claws 143 to open to release the logging radioactive source. After the elastic claws 143 release the logging radioactive source, the cable rope is pulled up, and the piston moves upward relative to the cylinder, causing the hydraulic oil in the first oil chamber to flow back to the second oil chamber through the flow limiting component 130. The elastic claws 143 contract, and finally the logging radioactive source release device is taken out.

[0045] In one specific embodiment, the mounting cylinder 141 is fixedly mounted to the second end of the cylinder 111 by threads. The gripping assembly 140 includes three mutually cooperating elastic claws 143, which are arranged around the outer periphery of the mounting cylinder 141. One end of the elastic claw 143 is fixedly mounted to the mounting cylinder 141 by bolts, and the other end of the elastic claw 143 is used to clamp the logging radioactive source. The second end of the push rod piston 142 is designed to be conical. The elastic claw 143 has an outwardly protruding extrusion part that cooperates with the conical shape. The side of the extrusion part facing the push rod piston 142 is constructed as an inclined surface. The push rod piston 142 moves downward under the action of hydraulic oil. The conical shape of the second end of the push rod piston 142 extrudes the inclined surface of the elastic claw 143, causing the other end of the elastic claw 143 to deform and open to grip the logging radioactive source.

[0046] The contact surface between the elastic claw 143 and the outer wall of the mounting cylinder 141 is serrated. When the push rod piston 142 moves upward under the action of hydraulic oil, the other end of the elastic claw 143 retracts to clamp the logging radioactive source. When the logging radioactive source is pulled up, the logging radioactive source applies a vertical axial pulling force to the elastic claw 143 due to gravity. Designing the contact surface between the elastic claw 143 and the outer wall of the mounting cylinder 141 as serrated can make the outer wall of the mounting cylinder 141 generate a vertical upward supporting force on the elastic claw 143, so as to overcome the vertical axial pulling force applied to the elastic claw 143 by the logging radioactive source due to gravity.

[0047] The area of ​​the hydraulic cylinder piston 122 acting on the hydraulic oil is about one-quarter of the area of ​​the hydraulic oil acting on the push rod piston 142. According to the principle of hydraulic transmission, under the action of the gravity of the connector 121 and the hydraulic cylinder piston 122, a force four times the gravity of the connector 121 and the hydraulic cylinder piston 122 will be generated on the push rod piston 142, making it easier for the push rod piston 142 to open the elastic claw 143. And the push rod piston 142 can open the elastic claw 143 while keeping the weight of the connector 121 and the hydraulic cylinder piston 122 as small as possible.

[0048] The logging radioactive source release device 100 provided in this embodiment of the invention specifically includes a cylinder assembly 110 comprising a cylinder body 111, a cylinder liner 112, and a piston assembly 120. The cylinder liner 112 is fixedly nested within the cylinder body 111, and the piston assembly 120 is disposed within the cylinder liner 112, forming a second oil chamber together with the flow limiting component 130. The cylinder assembly 110 also includes a centralizing sleeve 113 disposed at the end of the cylinder body 111. A connector 121 passes through the centralizing sleeve 113, with its first end connected to an external cable head and its second end connected to the piston assembly 120.

[0049] The cylinder liner 112 is fixedly nested within the inner wall of the cylinder body 111. The centralizing sleeve 113 is installed at the first end of the cylinder body 111. The piston assembly 120 is slidably installed inside the cylinder liner 112 through the centralizing sleeve 113. The centralizing sleeve 113 limits the piston assembly 120, preventing it from detaching from the cylinder body 111. At the same time, the centralizing sleeve 113 guides the piston assembly 120, allowing it to slide along the centralizing sleeve 113 within the cylinder liner 112.

[0050] In a specific embodiment, at least one sealing gasket 114 is provided between the two ends of the cylinder liner 112 and the cylinder body 111. In the logging radioactive source release device 100 provided in this embodiment, two sealing gaskets 114 are respectively provided between the two ends of the cylinder liner 112 and the cylinder body 111. The sealing gaskets 114 are O-ring rubber gaskets to enhance the sealing performance between the cylinder liner 112 and the cylinder body 111. The cylinder liner 112 is fixedly nested in the inner wall of the cylinder body 111, and the cylinder liner 112 is fixedly installed to the cylinder body 111 by bolts. The centralizing sleeve 113 is fixedly installed to the first end of the cylinder body 111 by threads.

[0051] Of course, it is understandable that other numbers of sealing gaskets 114 can be provided between the two ends of the cylinder liner 112 and the cylinder body 111. The sealing gaskets 114 can also be made of other materials, as long as they can achieve the sealing between the two ends of the cylinder liner 112 and the cylinder body 111. The cylinder liner 112 can also be fixedly installed to the cylinder body 111 in other ways, and the centralizing sleeve 113 can also be fixedly installed to the first end of the cylinder body 111 in other ways. No limitation is made here.

[0052] The well logging radioactive source release device 100 provided in this embodiment of the invention is described in detail in the attached document. Figure 1 and Figure 2 The flow limiting component 130 includes a plug 131 and a valve needle 132. The plug 131 is fixedly nested inside the cylinder 111 and abuts against the end of the cylinder liner 112. The valve needle 132 is fixedly nested inside the plug 131 and is clearance-fitted with the plug 131. The plug 131, nested in the inner wall of the cylinder 111, is used to seal the hydraulic oil inside the cylinder liner 112. The valve needle 132 is fixedly installed on the inner wall of the plug 131, and a gap is left between the valve needle 132 and the plug 131 to allow the hydraulic oil inside the cylinder liner 112 to pass through. The piston assembly 120 moves downward relative to the cylinder assembly 110 under the action of gravity, squeezing the hydraulic oil in the cylinder liner 112 to flow through the gap between the valve needle 132 and the plug 131, driving the gripping assembly 140 to open and release the logging radioactive source. By adjusting the size of the gap between the valve needle 132 and the plug 131, the flow rate of the hydraulic oil in the cylinder liner 112 through the gap between the valve needle 132 and the plug 131 is controlled, thereby controlling the opening time of the obstructed gripping assembly 140 of the logging radioactive source release device 100 provided in this embodiment of the invention.

[0053] In a specific embodiment, at least one sealing gasket 114 is further provided between the plug 131 and the cylinder 111. In the logging radioactive source release device 100 provided in this embodiment of the invention, an annular step is provided on the outer side wall of one end of the plug 131, and two sealing gaskets 114 are provided on the annular step to seal against the inner wall of the cylinder liner 112. Two sealing gaskets 114 are provided on the outer side wall of the other end of the plug 131 to seal against the inner wall of the cylinder 111, so as to enhance the sealing performance between the plug 131 and the inner wall of the cylinder 111 and prevent hydraulic oil from leaking between the plug 131 and the inner wall of the cylinder 111. Preferably, the sealing gaskets 114 are O-ring rubber gaskets. Of course, it is understood that the plug 131 can also be designed in other shapes, and the outer side wall of the plug 131 can also seal against the inner wall of the cylinder 111 through other numbers of sealing gaskets 114. The sealing gaskets 114 can also be gaskets of other materials, which are not limited here.

[0054] The logging radioactive source release device 100 provided in this embodiment of the invention further includes a flow-limiting component 130 that also includes a limiting member 133. The limiting member 133 is installed on the inner wall of the cylinder 111 and abuts against the plug 131 to limit the plug 131. Because the piston assembly 120 moves downward relative to the cylinder assembly 110 under the influence of gravity, it compresses the hydraulic oil in the cylinder liner 112, which flows through the gap between the valve needle 132 and the plug 131 to drive the gripping assembly 140 to open and release the logging radioactive source, the hydraulic oil in the cylinder liner 112 exerts pressure on the plug 131. Therefore, the limiting member 133 is provided to limit the plug 131 to prevent displacement of the plug 131 during use.

[0055] Specifically, the limiting component 133 includes a three-part bearing 135 (a steel ring divided into three segments) and an elastic retaining ring 136. The three-part bearing 135 is interference-fitted into a limiting groove on the inner wall of the cylinder body 111. The plug 131 is positioned between the cylinder liner 112 and the three-part bearing 135. A limiting groove is provided at the end of the plug 131 away from the cylinder liner 112 for installing the elastic retaining ring 136. The two sides of the three-part bearing 135 abut against the plug 131 and the elastic retaining ring 136 respectively, strengthening the limiting of the plug 131 and making it difficult for the plug 131 to move axially along the cylinder liner 112. Of course, it is understood that the limiting component 133 may also include other components, as long as they can limit the plug 131; this is not limited here.

[0056] The logging radioactive source release device 100 provided in this embodiment of the invention further includes a flow-limiting component 130 that also includes a filter element 134. The filter element 134 is fixedly nested within the inner wall of the plug 131 to filter the hydraulic oil flowing through the flow-limiting component 130. Since the logging radioactive source release device 100 provided in this embodiment of the invention relies on hydraulic oil flowing through the gap between the valve needle 132 and the plug 131 during use, and the gap between the valve needle 132 and the plug 131 is small, setting the filter element 134 to filter the hydraulic oil can prevent impurities in the hydraulic oil from clogging the gap between the valve needle 132 and the plug 131, thus preventing the logging radioactive source release device 100 provided in this embodiment of the invention from becoming unusable.

[0057] The logging radioactive source release device 100 provided in this embodiment of the invention specifically includes a piston assembly 120 comprising a connector 121 and a hydraulic cylinder piston 122. The first end of the connector 121 is used to connect to a cable head, and the hydraulic cylinder piston 122 is installed at the second end of the connector 121 and is slidably installed in a cylinder liner 112. During release, the connector 121 is connected to the cable rope. In this embodiment of the invention, the logging radioactive source release device 100 is suspended on the cable rope to the preset position of the logging radioactive source. Under the action of gravity, the connector 121 and the cylinder piston 122 move downward relative to the cylinder liner 112, squeezing the hydraulic oil in the cylinder liner 112 to flow through the gap between the valve needle 132 and the plug 131, driving the gripping assembly 140 to open and release the logging radioactive source. After the gripping assembly 140 has released the logging radioactive source, the cable rope is pulled up, and the connector 121 and the cylinder piston 122 move upward relative to the cylinder liner 112, so that the hydraulic oil that drove the gripping assembly 140 to open flows back into the cylinder liner 112 through the gap between the valve needle 132 and the plug 131. The gripping assembly 140 retracts, and finally the logging radioactive source release device 100 is taken out.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A logging radioactive source release device, characterized in that, The logging radioactive source release device includes: A cylinder assembly containing hydraulic oil, the cylinder assembly including a piston assembly; A flow limiting component is installed inside the cylinder assembly and divides the cylinder assembly into a first oil chamber and a second oil chamber. A push rod piston, at least partially disposed within the cylinder assembly, which, together with the flow-limiting assembly, forms the first oil chamber; and A gripping assembly is mounted on the cylinder assembly near the push rod piston. The gripping assembly includes multiple retractable elastic claws. The push rod piston can move under the action of hydraulic oil flowing into the first oil chamber and squeeze the elastic claws outward, causing the retracted elastic claws to open outward. The cylinder assembly includes a cylinder body, a cylinder liner, and a piston assembly. The cylinder liner is fixedly nested within the cylinder body, and the piston assembly is disposed within the cylinder liner, forming the second oil chamber together with the flow-limiting assembly. The piston assembly moves downward relative to the cylinder assembly under the action of gravity, and squeezes the hydraulic oil in the second oil chamber into the first oil chamber through the flow limiting component, thereby driving the push rod piston to move downward, causing the multiple retracted elastic claws to open. The flow limiting component is used to limit the flow rate of hydraulic oil between the first oil chamber and the second oil chamber. After the logging radiation source release device has been stationary at the preset position for a period of time, the hydraulic oil in the first oil chamber drives the elastic claw to open.

2. The logging radioactive source release device according to claim 1, characterized in that, The gripping assembly also includes a mounting cylinder, the end of which is provided with a plurality of elastic claws spaced apart circumferentially. The inner wall of the elastic claws has an outwardly protruding pressing part, and the side of the pressing part facing the push rod piston is constructed as an inclined surface.

3. The logging radioactive source release device according to claim 2, characterized in that, The contact surface between the elastic claw and the outer wall of the mounting cylinder is serrated.

4. The logging radioactive source release device according to claim 1, characterized in that, At least one sealing gasket is provided between the two ends of the cylinder liner and the cylinder body.

5. The logging radioactive source release device according to claim 1, characterized in that, The flow limiting component includes a plug and a valve needle. The plug is fixedly nested inside the cylinder and abuts against the end of the cylinder liner. The valve needle is fixedly nested inside the plug and is clearance-fitted with the plug.

6. The logging radioactive source release device according to claim 5, characterized in that, At least one sealing gasket is provided between the plug and the cylinder.

7. The logging radioactive source release device according to claim 5, characterized in that, The flow limiting component also includes a limiting member, which is installed on the inner wall of the cylinder and abuts against the plug to limit the plug.

8. The logging radioactive source release device according to claim 5, characterized in that, The flow limiting component also includes a filter element, which is fixedly disposed inside the plug and used to filter the hydraulic oil flowing through the flow limiting component.

9. The logging radioactive source release device according to claim 1, characterized in that, The cylinder assembly also includes a centralizing sleeve disposed at the end of the cylinder body, and a connector is provided inside the centralizing sleeve. The first end of the connector is connected to an external cable head, and the second end is connected to the piston assembly.

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