Turning plate type float valve short section for through-drill-bit well logging
By optimizing the structure of the flap-type float valve nipple, the problem that traditional float valves cannot be compatible with through-bit logging instruments has been solved, achieving safe and efficient logging operations and ensuring production safety and efficiency.
Patent Information
- Application Number
- CN202422840394.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-11-21
AI Technical Summary
The traditional flap-type float valve structure has a high degree of integration, which limits the space for expanding and adjusting the valve orifice diameter and cannot be used with through-bit logging instruments. As a result, the internal blowout preventer tool needs to be repeatedly disassembled and assembled before and after logging operations, affecting efficiency and posing a safety hazard.
A flap-type float valve nipple for through-bit logging has been designed. By optimizing the structure and connection method, the valve cover and sealing sleeve are integrated into the float valve nipple body, maintaining a minimum basic aperture communication channel in the central axis hole, allowing logging instruments to pass through, and automatically sealing in the event of a blowout or well kick. A metal sealing ring is used to improve reliability.
The through-bit logging operation can be performed without disassembling the float valve, which improves efficiency, reduces costs, ensures safety, and provides timely protection in the event of an accident, avoids sticking, and has a stable sealing effect.
Smart Images
Figure CN223423971U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of flap-type float valves, in particular to a flap-type float valve nipple for through-bit well logging. Background Art
[0002] The drill string float valve is an internal blowout prevention tool connected to the drilling pipe string during oilfield production. Its function is to automatically close the valve port to prevent blowouts when overflow, well kick or positive circulation stops. The float valve mainly includes two types: arrow-shaped float valve and flap float valve. Among them, the flap float valve uses a reversible valve cover to control the opening and closing of the valve port. The traditional structure is an independent integrated assembly composed of a valve body, valve seat, valve cover, torsion spring and pin shaft. A rubber sealing ring is set between the valve seat and the valve cover for sealing. When used, the overall supporting device is installed inside the drill pipe of the drill string, effectively preventing blowouts and well kicks, ensuring production safety, and has been widely used in oilfield production. In recent years, with the development of oilfield production technology, through-the-bit logging technology has been rapidly popularized in the oilfield production field due to its advantages of low operating cost, short time, low risk and high accuracy of logging data. The specific method is to pass the logging instrument through the drill string and a special drill bit with a special structure into the open hole section to collect formation evaluation data. However, due to the high degree of integration of the traditional integrated assembly structure of the flap-type float valve structure, the more complex mechanism directly limits the adjustment space for the expansion of the valve port diameter, making it impossible for the currently used flap-type float valves to be compatible with the through-the-bit logging instrument so that the logging instrument can pass smoothly through its valve port. Therefore, when performing through-the-bit logging operations, the drill pipe center must be removed in advance to install various types of internal blowout preventer tools including the flap-type float valve to ensure the implementation of through-the-bit logging operations. Obviously, under the current operation mode of through-the-bit logging operation, not only does the repeated disassembly and assembly of the internal blowout preventer before and after logging have a very adverse impact on the oil field production efficiency, but there are also very serious safety hazards when performing logging operations without the protection of the internal blowout preventer tool. Therefore, it is necessary to research and develop oil field internal blowout preventer tools that are compatible with the drill bit logging operation process to solve the existing technical problems. Utility Model Content
[0003] The purpose of the utility model is to provide a flap-type float valve nipple for through-bit logging, which is used in through-bit logging operations to implement safety protection against possible blowout and well kick accidents and ensure oilfield production safety.
[0004] The cam is threaded with a threaded hole that is formed on the cam face of the drill bit, and the cam face has a circle which is adapted to connect the drill bit to the center of the float valve. On the lower end port of the central axis hole of the joint, the inner hole diameter of the sealing sleeve is not less than the minimum basic aperture d inside the main body of the float valve short section, and the sealing surface of the valve cover has a sealing structure corresponding to the sealing sleeve, which is hingedly installed on the lower end surface of the short section female joint by the pin shaft, so that the valve cover can be flipped relative to the short section female joint with the pin shaft as the axis to close or open the lower end port of the central axis hole of the short section female joint. When closed, the sealing surface of the valve cover can form a sealing match with the sealing sleeve. When fully opened, the valve cover can be flipped as a whole in the increased diameter accommodating cavity and accommodated outside the spatial range of the connecting channel with the minimum basic aperture d, thereby ensuring the spatial connectivity of the connecting channel. The torsion spring is sleeved on the pin shaft, and the two force-applying ends are respectively supported on the valve cover and the short section female joint, so that the valve cover and the sealing sleeve form a normally closed sealing match state.
[0005] The flap-type floating valve short section for through-bit logging is preferably provided with a raised cone on the sealing surface of the valve cover, and at the same time, an annular conical surface is provided at the lower end of the inner hole of the sealing sleeve, and the annular conical surface and the outer circumferential conical surface structure on the raised cone correspond to each other. When the lower port of the central axis hole of the short section female joint is closed, the raised cone can be fitted and embedded in the inner hole of the sealing sleeve from the lower end, and the outer circumferential conical surface on the raised cone cooperates with the annular conical surface on the sealing sleeve to form a corresponding sealing fit between the valve cover and the sealing sleeve.
[0006] The flap-type floating valve nipple for through-bit logging is preferably provided with a leading curved surface at the front edge of the valve cover relative to the hinge point. The setting of the leading curved surface can maintain a smooth fit and contact between the valve cover and the reducing cone surface on the outer circumference of the logging instrument and dynamically adaptively flip with the movement of the logging instrument under the action or guidance of the reducing cone surface, so as to avoid the valve cover and the logging instrument from forming a sharp contact during the upward lifting of the logging instrument, which may cause the valve cover to become stuck or jammed with the logging instrument, causing the logging instrument to be unable to be lifted upward or unable to be lifted upward smoothly.
[0007] The flap-type floating valve pup joint for through-bit logging is preferably provided with a cylindrical protrusion structure on the back side of the valve cover, and the cylindrical protrusion structure corresponds to the inner cylindrical surface structure of the pup joint male joint. The setting of the cylindrical protrusion structure can ensure the overall structural strength of the valve cover. When the lower port of the central axis hole of the pup joint female joint is opened and the valve cover is fully flipped over, the valve cover can be safely and reliably stored outside the setting space of the minimum basic aperture d, avoiding the setting area of the minimum basic aperture d to the greatest extent, and ensuring the continuous flow of the connecting channel.
[0008] The flap-type floating valve pup joint for through-bit logging is preferably provided with a pressure relief valve installed on the pup joint female joint.
[0009] The beneficial effect of the utility model is to provide a flap-type float valve nipple for through-bit logging. According to the process requirements of through-bit logging operations, the basic structure of the traditional flap-type float valve is changed. By optimizing the design structure and connection matching method, the valve cover and the sealing sleeve are directly integrated and installed on the float valve nipple body, reducing the structural occupation of the internal space of the central axial hole, so that the central axial hole maintains a minimum basic aperture communication channel for the logging instrument to pass through, which can effectively ensure the operation and implementation of through-bit logging operations. When applied to oilfield drilling production, there is no need to repeatedly lift the drill pipe of the drill tool to disassemble and install the float valve before and after the through-bit logging operation is carried out, which significantly improves the efficiency of the logging operation, reduces the labor intensity of the operation, and reduces the production cost. Moreover, if a kick or blowout occurs during the logging operation, it is only necessary to quickly lift the logging instrument to rise above the sealing sleeve, and the valve cover can automatically flip and close the central axial hole of the float valve nipple body, timely blocking the central water hole of the drill pipe of the drill tool, playing a safety protection role, and effectively ensuring production safety. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 This is a cross-sectional view of the structure of a flap-type float valve pup joint for through-bit logging.
[0011] Figure 2 for Figure 1 Cross-sectional view of the middle AA section.
[0012] Figure 3 for Figure 2 The middle valve cover is fully flipped open.
[0013] Figure 4 This is the main view of the valve cover structure.
[0014] Figure 5 for Figure 4 Cross-sectional view of the middle BB section.
[0015] Figure 6 This is a structural diagram of the well logging instrument passing through the sealing sleeve.
[0016] Among them: 1 is a short joint female joint, 2 is a short joint male joint, 3 is a valve cover, 4 is a sealing sleeve, 5 is a pin shaft, 6 is a torsion spring, 7 is a raised cone, 8 is a leading curved surface, 9 is a cylindrical raised structure, 10 is a logging instrument, and 11 is a pressure relief valve. DETAILED DESCRIPTION
[0017] Furthermore, the technical solution claimed for protection of the present utility model is described in detail in conjunction with specific embodiments and the accompanying drawings.
[0018] A flap-type float valve nipple for through-bit logging, such as Figures 1 to 5As shown, it consists of a short section female joint 1, a short section male joint 2, a valve cover 3, a sealing sleeve 4, a pin shaft 5, a torsion spring 6 and a pressure relief valve 11; the upper ends of the short section female joint 1 and the short section male joint 2 are respectively provided with connecting internal threads, and the lower ends are respectively provided with connecting external threads, the short section female joint 1 and the short section male joint 2 are connected with each other through the upper and lower threads to form the float valve short section body, the float valve short section body has an axially through central axis hole, and a connecting channel with a minimum basic aperture d is maintained in the central axis hole, the pressure relief valve 11 is provided and installed on the side wall of the short section female joint 1, and an increasing diameter accommodating cavity with an inner cavity aperture D is provided at the upper end of the short section male joint 2, and the inner cavity aperture D is larger than the minimum basic aperture d; the sealing sleeve 4 is made of copper alloy material and is inlaid on the lower port of the central axis hole of the short section female joint 1, the inner hole aperture of the sealing sleeve 4 is the same as the minimum basic aperture d, and the inner hole is the same as the minimum basic aperture d. The connecting channel of diameter d is continuously connected so that the connecting channel fully maintains the patency of the connection, and an annular conical surface is opened at the lower end of the inner hole; the valve cover 3 is made of stainless steel, and a raised cone 7 is provided on the sealing surface. The outer circumferential conical surface on the raised cone 7 corresponds to the annular conical surface structure opened on the sealing sleeve 4, and a cylindrical raised structure 9 is provided on the back side. The cylindrical raised structure 9 corresponds to the inner cylindrical surface structure of the short section male joint 2. The pin 5 is used to hinge one side edge to the lower end face of the short section female joint 1, so that the valve cover 3 can be flipped relative to the short section female joint 1 with the pin 5 as the axis. The front edge on the other side relative to the hinge point is set as a leading curved surface 8 with a continuous and smooth transition. The torsion spring 6 is sleeved on the pin 5, and the two force-applying ends are respectively supported on the valve cover 3 and the short section female joint 1, so that the valve cover 3 and the sealing sleeve 4 form a normally closed sealing matching state.
[0019] The flap-type float valve short section for through-bit logging described in this embodiment is applied in through-bit logging operations. The flap-type float valve short section for through-bit logging is connected to the drill pipe of the drilling tool by means of the connecting internal thread at the upper end of the short section female joint 1 and the connecting external thread at the lower end of the short section male joint 2, and is dropped into the well while drilling. During the drilling production process, the flap-type float valve short section for through-bit logging can play a normal production safety protection role in preventing blowouts and well surges. When through-bit logging is required according to the drilling production regulations, the assembled and connected logging instrument string is hoisted and dropped into the central water hole of the drill pipe of the drilling tool by the logging cable. When the logging instrument string continues to descend into the inner cavity of the short section female joint 1, as shown in FIG. Figure 6As shown, the logging instrument 10 on the logging instrument string can push the valve cover 3 to flip by its own gravity, open the central axis hole in the short joint female joint 1 sealed by the valve cover 3 in the normally closed state, and allow the logging instrument string to pass through the inner hole of the sealing sleeve 4 and the central axis hole of the short joint male joint 2 in sequence, and then the logging instrument string continues to descend in the central water hole of the drill pipe of the drilling tool until it passes through the drill bit and enters the open hole, and then the logging instrument 10 is started and is made to measure and collect data as the drill pipe of the drilling tool moves, completing the logging operation; after the logging operation is completed, without lifting the drill pipe of the drilling tool In this case, the logging cable is lifted to pull out the logging instrument string. When the logging instrument string ascends in the central water hole of the drill pipe, enters the short joint male joint 2 and then passes through the sealing sleeve 4, the leading curved surface 8 provided on the front edge of the valve cover 3 and the reducing cone surface on the outer circumference of the logging instrument 10 always maintain smooth fitting contact, so that the valve cover 3 can be dynamically adaptively flipped with the movement of the logging instrument 10, ensuring that the logging instrument string can smoothly pass through the sealing sleeve 4. Continuing to ascend can lift the entire logging instrument string out of the well, completing the through-the-bit logging operation.
[0020] During the above-mentioned through-bit logging operation, since the through-bit logging flip-type float valve sub of this embodiment is connected and installed in the drill pipe of the drilling tool, it is not necessary to lift the drill pipe out of the well for disassembly and installation of the float valve before and after the operation, which can significantly improve the efficiency of the logging operation, reduce the labor intensity of the operation, and reduce production costs. At the same time, if a kick or blowout occurs during the logging operation, as long as the logging instrument string is quickly lifted so that the logging instrument string rises to the upper part of the through-bit logging flip-type float valve sub of this embodiment, the valve cover 3 can automatically flip and close the central axis hole of the float valve sub body, timely blocking the central water hole of the drilling tool drill pipe, preventing the downhole fluid from gushing to the wellhead surface and causing serious production accidents, thereby providing a very reliable safety protection function. In addition, the use of a rigid metal sealing ring instead of the rubber sealing ring used in the traditional flip-type float valve can avoid the possible damage to the rubber sealing ring structure or the entire detachment caused by the friction and collision of the logging instrument, thereby ensuring a stable sealing effect and improving the reliability of the safety protection.
Claims
1. A flap-type float valve nipple for through-bit logging, characterized in that: include: A short-section female joint (1), a short-section male joint (2), a valve cover (3), a sealing sleeve (4), a pin shaft (5) and a torsion spring (6); the lower end of the short-section female joint (1) is provided with a connecting external thread, the upper end of the short-section male joint (2) is provided with a connecting internal thread corresponding to the connecting external thread structure, the short-section female joint (1) and the short-section male joint (2) are connected by corresponding threads at the upper and lower ends to form a floating valve short-section body, the interior of the floating valve short-section body has an axially through-going central axis hole, the central axis hole maintains a connecting passage with a minimum basic aperture d for a logging instrument (10) to pass through, the upper end of the short-section female joint (1) and the lower end of the short-section male joint (2) respectively have a mechanical connection structure, and the upper end of the short-section male joint (2) is provided with an increased diameter accommodating cavity with an aperture increased relative to the minimum basic aperture d; the sealing sleeve (4) is made of a metal sealing material. The valve cover (3) is a valve body that is embedded in the lower end of the central axis hole of the short section female joint (1), the inner hole diameter of the sealing sleeve (4) is not less than the minimum basic aperture inside the main body of the float valve short section, the sealing surface of the valve cover (3) has a sealing structure corresponding to the sealing sleeve (4), and the pin shaft (5) is hingedly installed on the lower end face of the short section female joint (1), so that the valve cover (3) can be turned relative to the short section female joint (1) with the pin shaft (5) as the axis. When fully opened, the valve cover (3) can be turned as a whole in the increased diameter accommodating cavity and accommodated outside the space range of the minimum basic aperture d communication channel. The torsion spring (6) is sleeved on the pin shaft (5), and the two force-applying ends are respectively supported on the valve cover (3) and the short section female joint (1), so that the valve cover (3) and the sealing sleeve (4) form a normally closed sealing matching state.
2. The flap-type float valve sub for through-bit logging according to claim 1, characterized in that: A raised cone (7) is provided on the sealing surface of the valve cover (3), and an annular conical surface is provided at the lower end of the inner hole of the sealing sleeve (4). The annular conical surface corresponds to the outer circumferential conical surface structure on the raised cone (7). When the lower end of the central axis hole of the short section female joint (1) is closed, the raised cone (7) can be fitted and embedded in the inner hole of the sealing sleeve (4) from the lower end.
3. The flap-type float valve sub for through-bit logging according to claim 2, characterized in that: A leading curved surface (8) is provided on the front edge of the valve cover (3) relative to the hinge point.
4. The flap-type float valve sub for through-bit logging according to claim 3, characterized in that: A cylindrical protruding structure (9) is provided on the back side of the valve cover (3), and the cylindrical protruding structure (9) corresponds to the inner cylindrical surface structure of the short joint male connector (2).
5. The flap-type floating valve sub for through-bit logging according to any one of claims 1 to 4, characterized in that: A pressure relief valve (11) is installed on the short female joint (1).