Anti-blocking regenerative screw drill
By designing a combination of double valve core structure and filter mesh in the screw drilling tool, the problem of silt and sand backflow blocking bypass valve is solved, and the efficient operation of the equipment and the service life are extended.
Patent Information
- Application Number
- CN202422198014.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-09-09
AI Technical Summary
During the drilling process of existing screw drilling tools, mud and sand are prone to flow backwards and block the bypass valve, resulting in equipment failure.
An anti-blocking regeneration screw drill is designed, adopting a combination of a double valve core structure and a filter net. The first valve core is inserted or withdrawn from the insertion end of the second valve core, and the opening and closing state of the bypass inner hole is controlled, and the aperture of the filter net changes. According to the working state of the drill tool, sand and gravel can effectively prevent entry of the bypass valve.
It effectively avoids the entry of mud and sand and gravel into the bypass valve, reduces the risk of blockage, extends the service life of the equipment, and improves the working efficiency of the drilling tool.
Smart Images
Figure CN222962792U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of drilling equipment, and more specifically, relates to an anti-blocking regenerative positive displacement downhole motor. Background Art
[0002] A positive displacement downhole motor is a volumetric downhole motor that uses drilling fluid as power to convert liquid pressure energy into mechanical energy. It mainly consists of four major assemblies: a bypass valve, a fluid motor, a universal joint, and a drive shaft. After long-term use, various parts of the positive displacement downhole motor will show different degrees of wear, ultimately leading to the scrapping of the product. These scrapped products will be transported back to the factory for remanufacturing. By processing each part, the performance of the product is restored and it can be put back into use. During the regeneration process of the positive displacement downhole motor, it is found that a large amount of sediment will accumulate and block the bypass valve in the scrapped positive displacement downhole motor, which urgently needs to be solved.
[0003] The main functions of the bypass valve of the positive displacement downhole motor include: during the process of tripping in and out of the well, the pressure of the drilling fluid in the drill string decreases, and the bypass valve is in the bypass state, allowing the drilling fluid in the drill string to directly flow out from the side bypass outer hole without passing through the motor; when the flow rate and pressure of the drilling fluid in the drill string increase to a certain value, the bypass valve is in the direct-through state, and the drilling fluid enters the motor, and the motor converts the pressure energy of the drilling fluid into mechanical energy.
[0004] After analysis, it is found that the sediment content in the drilling fluid of the borehole is very large. In order to prevent sediment from entering the bypass valve, although a filter screen is provided in the bypass outer hole, in order to avoid excessive resistance in the bypass outer hole, the holes of the filter screen are usually set relatively large, making it difficult to block some fine sand and gravel. Especially when the bypass valve is in the direct-through state, all the drilling fluid in the drill string enters the hydraulic motor assembly to work and no longer flows out from the bypass outer hole, resulting in easier entry of external sand and gravel from the bypass outer hole, and there is a certain possibility of blockage. Summary of the Utility Model
[0005] In view of this, the embodiments of this application provide an anti-blocking regenerative positive displacement downhole motor to solve the technical problem that sediment in the borehole is likely to backflow and block the bypass valve of the positive displacement downhole motor in the prior art.
[0006] To achieve the above object, the technical solution adopted in this application is as follows:
[0007] On the one hand, an anti-blocking regenerative positive displacement downhole motor is provided, including: a liquid inlet joint section, a bypass valve section, an anti-drop section, a motor section, and a transmission section arranged in sequence;
[0008] Among them, the bypass valve section includes:
[0009] An outer cylinder, one end of which is communicated with the liquid inlet joint section, the other end is communicated with the anti-drop section, and the side wall is provided with a bypass outer hole;
[0010] The first spool valve is arranged inside the outer cylinder and is provided with a first through hole in the middle for conducting the outer cylinder;
[0011] The second spool valve is arranged inside the outer cylinder and is provided with a second through hole in the middle for conducting the outer cylinder. One end is an insertion end, and a bypass inner hole corresponding to the bypass outer hole is provided on the side wall of the insertion end. The second spool valve is located on one end side of the first spool valve close to the liquid inlet joint section, and the insertion end faces the first spool valve. The second spool valve is slidably arranged along the axial direction of the outer cylinder so that the insertion end can be inserted into or withdrawn from the first spool valve. When the insertion end is inserted into the first spool valve, the side wall of the first spool valve closes the bypass inner hole. When the insertion end withdraws from the first spool valve, the bypass inner hole is opened and communicated with the bypass outer hole;
[0012] The return spring is arranged between the first spool valve and the second spool valve and is adapted to push the second spool valve away from the second spool valve so that the insertion end withdraws from the first spool valve;
[0013] The filter screen is attached to the inner wall of the outer cylinder and is opposite to the bypass outer hole. The filter screen includes a first end with a larger aperture and a second end with a smaller aperture. The first end of the filter screen is close to the first spool valve, and the second end is close to the second spool valve;
[0014] The minimum cross-sectional area of the second through hole is smaller than the cross-sectional area of the inner hole of the liquid inlet joint section. When the drilling fluid flow rate in the liquid inlet joint section is greater than a predetermined value, the drilling fluid pushes the second spool valve to compress the return spring so that the insertion end is inserted into the first spool valve;
[0015] The filter screen is connected to the second spool valve and moves with the second spool valve. When the insertion end is inserted into the first spool valve, the second end of the filter screen is opposite to the bypass outer hole. When the insertion end withdraws from the first spool valve, the first end of the filter screen is opposite to the bypass outer hole.
[0016] In some embodiments, a first annular groove is provided on the outer periphery of the end of the second spool valve close to the first spool valve, and the return spring is arranged around the first annular groove.
[0017] In some embodiments, the filter screen is in a cylindrical shape matching the inner wall of the outer cylinder, and the filter screen surrounds the outer periphery of the return spring.
[0018] In some embodiments, the aperture of the filter screen gradually decreases from the first end to the second end.
[0019] In some embodiments, the second end of the filter screen is connected to the end of the second spool valve far from the first spool valve.
[0020] In some embodiments, one end of the first through hole of the second valve core facing the liquid inlet joint section is a flared opening.
[0021] In some embodiments, a plurality of the bypass outer holes are circumferentially distributed on the side wall of the outer cylinder, a plurality of the bypass inner holes are circumferentially distributed on the side wall of the insertion end, and the bypass inner holes correspond to the bypass outer holes one by one.
[0022] The beneficial effects of the anti-blocking regenerative screw drill provided by the embodiments of the present application are as follows: compared with the prior art, in the anti-blocking regenerative screw drill of the embodiments of the present application, when the insertion end of the second valve core is inserted into the first valve core, the side wall of the second valve core closes the bypass inner hole, so that the bypass valve is in a direct-through state, and the drilling fluid flowing into the liquid inlet joint section directly enters the motor section through the first through hole of the first valve core and the second through hole of the second valve core; when the insertion end of the second valve core withdraws from the first valve core, the bypass inner hole of the second valve core is opened and communicates with the outside through the bypass outer hole of the outer cylinder, so that the bypass valve is in a bypass state, and the drilling fluid flowing into the liquid inlet joint section flows to the outside after encountering the resistance of the motor section;
[0023] The setting of the filter screen makes that when the bypass valve is in a direct-through state, the second valve core drives the filter screen to make the second end with a smaller aperture of the filter screen face the bypass outer hole, better avoiding the entry of sand and gravel from the outside through the bypass outer hole to block the bypass valve; when the bypass valve is in a bypass state, the second valve core drives the filter screen to make the first end with a larger aperture of the filter screen face the bypass outer hole, which can not only ensure that the resistance of the bypass outer hole is small, but also avoid the entry of sand and gravel from the outside through the bypass outer hole to block the bypass valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.
[0025] Figure 1 It is a schematic diagram of the overall structure of the anti-blocking regenerative screw drill provided by the embodiments of the present application;
[0026] Figure 2 is Figure 1 the internal structure schematic diagram of the bypass valve section in, and the bypass valve section is in a bypass state in the figure;
[0027] Figure 3 is Figure 2 the enlarged view of A in;
[0028] Figure 4 When the bypass valve section is in a direct-through state, Figure 3Schematic diagram of the state at the corresponding position.
[0029] Among them, the reference numerals in the figure are as follows:
[0030] 1 - liquid inlet joint section; 2 - bypass valve section; 21 - outer cylinder; 211 - bypass outer hole; 22 - first valve core; 221 - first through hole; 23 - second valve core; 231 - second through hole; 232 - insertion end; 233 - bypass inner hole; 234 - first annular groove; 24 - return spring; 25 - filter screen; 3 - anti - dropping section; 4 - motor section; 5 - transmission section. Detailed implementation manners
[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0032] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0033] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.
[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meanings of "a plurality of" and "several" are two or more, unless otherwise specifically defined.
[0035] Please refer to Figures 1 to 4 , and now a clog - proof regenerative screw drill provided by the embodiment of the present application will be described. A clog - proof regenerative screw drill includes: a liquid inlet joint section, a bypass valve section, an anti - dropping section, a motor section and a transmission section arranged in sequence;
[0036] Among them, the bypass valve section includes:
[0037] The outer cylinder is connected to the liquid inlet joint section at one end and the anti-falling section at the other end, and there is a bypass outer hole on the side wall;
[0038] The first valve core is arranged inside the outer cylinder, and there is a first through hole in the middle to conduct the outer cylinder;
[0039] The second valve core is arranged inside the outer cylinder, and there is a second through hole in the middle to conduct the outer cylinder. One end is an insertion end, and there is a bypass inner hole corresponding to the bypass outer hole on the side wall of the insertion end; The second valve core is located on one end side of the first valve core close to the liquid inlet joint section, and the insertion end faces the first valve core; The second valve core is slidably arranged along the axial direction of the outer cylinder so that the insertion end can be inserted into or withdrawn from the first valve core. And when the insertion end is inserted into the first valve core, the side wall of the first valve core closes the bypass inner hole. When the insertion end withdraws from the first valve core, the bypass inner hole opens and communicates with the bypass outer hole;
[0040] The return spring is arranged between the first valve core and the second valve core, and is adapted to push the second valve core away from the second valve core so that the insertion end withdraws from the first valve core;
[0041] The filter screen is attached to the inner wall of the outer cylinder and is opposite to the bypass outer hole; The filter screen includes a first end with a larger aperture and a second end with a smaller aperture. The first end of the filter screen is close to the first valve core, and the second end is close to the second valve core;
[0042] The minimum cross-sectional area of the second through hole is smaller than the cross-sectional area of the inner hole of the liquid inlet joint section, so that when the flow rate of the drilling fluid in the liquid inlet joint section is greater than a predetermined value, the drilling fluid pushes the second valve core to compress the return spring so that the insertion end is inserted into the first valve core;
[0043] The filter screen is connected to the second valve core and moves with the second valve core. And when the insertion end is inserted into the first valve core, the second end of the filter screen is opposite to the bypass outer hole. When the insertion end withdraws from the first valve core, the first end of the filter screen is opposite to the bypass outer hole.
[0044] Compared with the prior art, in the anti-blocking regenerative positive displacement motor drill of the embodiment of the present application, when the insertion end of the second valve core is inserted into the first valve core, the side wall of the second valve core closes the bypass inner hole, so that the bypass valve is in a direct-through state, and the drilling fluid flowing into the liquid inlet joint section directly enters the motor section through the first through hole of the first valve core and the second through hole of the second valve core; When the insertion end of the second valve core withdraws from the first valve core, the bypass inner hole of the second valve core opens and communicates with the outside through the bypass outer hole of the outer cylinder, so that the bypass valve is in a bypass state, and the drilling fluid flowing into the liquid inlet joint section flows to the outside after encountering the resistance of the motor section;
[0045] The setting of the filter screen is such that when the bypass valve is in the direct-through state, the second valve core drives the filter screen so that the second end with a smaller pore size of the filter screen faces the bypass outer hole, better avoiding sand and gravel from the outside entering through the bypass outer hole and blocking the bypass valve; when the bypass valve is in the bypass state, the second valve core drives the filter screen so that the first end with a larger pore size of the filter screen faces the bypass outer hole, which can not only ensure a smaller resistance of the bypass outer hole but also prevent sand and gravel from the outside from entering through the bypass outer hole and blocking the bypass valve.
[0046] In this embodiment, the liquid inlet joint section, the bypass valve section, the anti-drop section, the motor section, and the transmission section can be a split structure assembled and connected together, or an integral structure formed in sequence within the same cylinder body. The specific structures of the liquid inlet joint section, the anti-drop section, the motor section, and the transmission section can refer to the common structures of positive displacement motors on the market.
[0047] In this embodiment, both ends of the outer cylinder of the bypass valve section are respectively communicated with the adjacent liquid inlet joint section and the anti-drop section. This enables the drilling fluid flowing out from the liquid inlet joint section to enter the bypass valve section, and the drilling fluid passing through the bypass valve section enters the anti-drop section and then enters the motor section subsequently.
[0048] In this embodiment, the first valve core is fixedly installed inside the outer cylinder by means of a limiting step, usually set inside the lower end of the outer cylinder near the anti-drop section.
[0049] In this embodiment, the second valve core is movably arranged inside the upper end of the outer cylinder near the liquid inlet joint section. The inner hole of the outer cylinder is cylindrical, and correspondingly, the outer profile of the second valve core is cylindrical and matches the inner wall of the outer cylinder, so that it can slide up and down. The outer diameter of the lower end of the second valve core is reduced to match the first through hole of the first valve core to form an insertion end. The insertion end of the second valve core inserts into the first valve core to a depth such that the side wall of the first valve core can completely close the bypass inner hole of the second valve core. The minimum cross-sectional area of the second through hole is smaller than the cross-sectional area of the inner hole of the liquid inlet joint section, so that when the drilling fluid in the liquid inlet joint section enters the second through hole, it will form a downward thrust on the second valve core; when the flow rate of the drilling fluid in the liquid inlet joint section is greater than a predetermined value, the thrust of the drilling fluid on the second valve core is greater than the elastic force of the return spring, thereby causing the second valve core to move downward, and the insertion end inserts into the first valve core, and the side wall of the first valve core closes the bypass inner hole, and the bypass valve is in the direct-through state.
[0050] In this embodiment, the return spring is used to push the second valve core upward. When the flow rate of the drilling fluid in the drill pipe decreases, the return spring pushes the second valve core upward to keep the bypass inner hole open, and the bypass valve is in the bypass state.
[0051] In this factual example, the filter screen can be cylindrical and fit the inner wall of the outer cylinder, or it can only cover a part of the inner wall of the outer cylinder where bypass outer holes are provided. The filter screen is fixed to the second valve core and moves up and down with the second valve core, so that the first end or the second end of the filter screen can be switched to face the bypass outer holes of the outer cylinder, achieving different filtering effects.
[0052] Please refer to Figures 2 to 4 , as a specific implementation manner of the anti-blocking regenerative positive displacement motor provided in this application, a first annular groove is provided on the outer periphery of the end of the second valve core close to the first valve core, and a return spring is disposed around the first annular groove.
[0053] In this embodiment, by machining a first annular groove on the outer periphery of the upper end of the second valve core, an installation space can be provided for the return spring.
[0054] Please refer to Figures 2 to 4 , as a specific implementation manner of the anti-blocking regenerative positive displacement motor provided in this application, the filter screen is in a cylindrical shape matching the inner wall of the outer cylinder, and the filter screen surrounds the outer periphery of the return spring.
[0055] In this embodiment, setting the filter screen in a cylindrical shape matching the inner wall of the outer cylinder can enable the filter screen to move up and down stably with the second valve core and ensure it faces the bypass outer holes of the outer cylinder. The filter screen surrounds the outer periphery of the return spring, making the overall structure more compact.
[0056] Please refer to Figures 2 to 4 , as a specific implementation manner of the anti-blocking regenerative positive displacement motor provided in this application, the aperture of the filter screen gradually decreases from the first end to the second end.
[0057] In specific implementation, from the upper end to the lower end of the filter screen, the diameter of the mesh holes gradually increases.
[0058] Please refer to Figures 2 to 4 , as a specific implementation manner of the anti-blocking regenerative positive displacement motor provided in this application, the second end of the filter screen is connected to the end of the second valve core away from the first valve core.
[0059] In specific implementation, the upper end of the filter screen surrounds the outer of the second valve core and is fixed to the outer periphery of the upper end of the second valve core, so that the filter screen is firmly connected to the second valve core.
[0060] Please refer to Figure 2 , as a specific implementation manner of the anti-blocking regenerative positive displacement motor provided in this application, the end of the first through hole of the second valve core facing the liquid inlet joint section is a flared mouth.
[0061] In this embodiment, the first through hole is flared, which can reduce the resistance to the drilling fluid flowing in from the liquid inlet joint section and enable the drilling fluid to smoothly enter and pass through the first through hole. In a specific implementation, the inner diameter of the main body part of the first through hole is smaller than the inner diameter of the liquid inlet joint section, and the diameter of the end part of the first through hole gradually increases to form a flare, and the inner diameter of the large end of the flare is close to the inner diameter of the liquid inlet joint section.
[0062] Please refer to Figures 2 to 4 , as a specific implementation manner of the anti-blocking regenerative positive displacement motor provided by the present application, a plurality of bypass outer holes are circumferentially distributed on the side wall of the outer cylinder, and a plurality of bypass inner holes are circumferentially distributed on the side wall of the insertion end, and the bypass inner holes and the bypass outer holes correspond to each other one by one.
[0063] In a specific implementation, the plurality of bypass outer holes are evenly distributed along the circumference of the outer cylinder, and the plurality of bypass inner holes are evenly distributed along the circumference of the insertion end.
[0064] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. An anti-blocking regenerative screw drill, comprising a liquid inlet joint section, a bypass valve section, an anti-drop section, a motor section and a transmission section arranged in sequence; characterized in that: The bypass valve section comprises: An outer cylinder, one end of which is connected to the liquid inlet joint section, and the other end of which is connected to the anti-drop section, and a bypass outer hole is provided on the side wall; A first valve core is arranged in the outer tube, and a first through hole is arranged in the middle thereof to conduct the outer tube; The second valve core is arranged in the outer cylinder, and a second through hole for conducting the outer cylinder is arranged in the middle, and one end is an insertion end, and a bypass inner hole corresponding to the bypass outer hole is arranged on the side wall of the insertion end; the second valve core is located on the end side of the first valve core close to the liquid inlet joint section, and the insertion end faces the first valve core; the second valve core is axially slidably arranged along the outer cylinder, so that the insertion end can be inserted into or withdrawn from the first valve core, and when the insertion end is inserted into the first valve core, the side wall of the first valve core closes the bypass inner hole, and when the insertion end withdraws from the first valve core, the bypass inner hole is opened and communicated with the bypass outer hole; a return spring, disposed between the first valve core and the second valve core, adapted to push the second valve core away from the second valve core so that the insertion end exits the first valve core; A filter screen is attached to the inner wall of the outer cylinder and is opposite to the bypass outer hole; the filter screen comprises a first end with a larger aperture and a second end with a smaller aperture, the first end of the filter screen is close to the first valve core, and the second end is close to the second valve core; The minimum cross-sectional area of the second through hole is smaller than the cross-sectional area of the inner hole of the liquid inlet joint section, so that when the drilling fluid flow rate of the liquid inlet joint section is greater than a predetermined value, the drilling fluid pushes the second valve core to compress the return spring, so that the insertion end is inserted into the first valve core; The filter net is connected to the second valve core and moves with the second valve core, and when the insertion end is inserted into the first valve core, the second end of the filter net is opposite to the bypass outer hole, and when the insertion end is withdrawn from the first valve core, the first end of the filter net is opposite to the bypass outer hole.
2. The anti-blocking regeneration screw drill according to claim 1, characterized in that: A first annular groove is disposed on the outer periphery of one end of the second valve core close to the first valve core, and the return spring is disposed around the first annular groove.
3. The anti-blocking regeneration screw drill according to claim 2, characterized in that: The filter screen is in a cylindrical shape matching the inner wall of the outer cylinder, and the filter screen surrounds the outer periphery of the return spring.
4. The anti-blocking regeneration screw drill according to claim 3, characterized in that: The aperture of the filter screen gradually decreases from the first end to the second end.
5. The anti-blocking regeneration screw drill according to claim 4, characterized in that: The second end of the filter screen is connected to an end of the second valve core away from the first valve core.
6. The anti-blocking regeneration screw drill according to claim 1, characterized in that: One end of the first through hole of the second valve core facing the liquid inlet joint section is a bell mouth.
7. The anti-blocking regeneration screw drill according to claim 1, characterized in that: The side wall of the outer cylinder has a plurality of bypass outer holes distributed along the circumferential direction, and the side wall of the insertion end has a plurality of bypass inner holes distributed along the circumferential direction, and the bypass inner holes correspond to the bypass outer holes one by one.