A direct push well instrument multifunctional bypass conversion sub

Abstract

The application discloses a straight push well logging instrument multifunctional bypass conversion nipple, which comprises a drilling tool adapter shell, a bypass nipple, a conversion joint, an instrument adapter shell, a variable-diameter wire pipe, a circuit framework, an adapter head and a backflow gasket, the upper end of the drilling tool adapter shell is used for connecting a drilling tool, the lower end of the instrument adapter shell is used for connecting a well logging instrument string, and the bypass nipple is used for discharging drilling fluid; the variable-diameter wire pipe is used for connecting a turbine generator or connecting an LWD system. The straight push well logging instrument multifunctional bypass conversion nipple is used for connecting a drilling tool by means of a drilling tool adapter shell and connecting a well logging instrument by means of an instrument adapter shell, the bypass nipple guarantees that drilling fluid circulation is smooth, and the variable-diameter wire pipe and the circuit framework are internally arranged and used for connecting a turbine generator to rectify power supply or connecting an LWD system to communicate and supply power, different buckling types can be adapted, and a well logging instrument string is connected by means of a drill pipe to perform straight push operation, and the operation capacity of the well logging instrument string in a high-deviation well is improved.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas drilling and logging technology, and in particular relates to a multi-functional bypass conversion section for a vertical drilling instrument. Background Technology

[0002] In logging operations in highly deviated and horizontal wells, push-type logging instruments rely on drill pipe or delivery tools for propulsion, facing harsh downhole environments characterized by high temperatures, high pressures, high vibrations, and mud erosion. Existing bypass subs typically only provide basic mud flow functionality, lacking effective protection for internal precision circuits and mechanical structures. Furthermore, logging instruments require both an independent power supply system (such as a turbine generator) and communication with the measurement-while-drilling (LWD) system; existing subs are functionally limited and cannot simultaneously meet these demands. In addition, the eddies and impacts generated when mud flows through the bypass orifice can easily lead to instrument vibration and even structural fatigue, affecting operational safety. Summary of the Invention

[0003] The problem to be solved by the present invention is to provide a multi-functional bypass conversion section for a direct logging instrument. This section integrates mud diversion, pressure balancing, power generation, signal communication and multiple mechanical protection functions, which can effectively adapt to complex downhole conditions and improve the stability and reliability of logging operations.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a multi-functional bypass conversion sub for a direct drilling instrument, comprising, from top to bottom, a drill string adapter housing, a bypass sub, a conversion connector, and an instrument adapter housing. The upper end of the drill string adapter housing is connected to the drill string. A turbine generator or a variable diameter adapter is installed inside the drill string adapter housing. The turbine generator or the variable diameter adapter is connected to the upper end of a variable diameter through pipe. The lower end of the drill string adapter housing is connected to the upper end of the bypass sub. The side wall of the bypass sub has a circulation hole, the axis of which is inclined downward relative to the axis of the bypass sub. The variable diameter through pipe is placed inside the bypass sub, and a circuit frame is provided inside the variable diameter through pipe. The lower end of the conduit extends into the adapter. The lower end of the bypass stub is connected to the upper end of the adapter. The upper end of the adapter is provided with an electrical connection socket. An electrical connection plug is installed on the lower end face of the variable diameter conduit. The electrical connection plug and the electrical connection socket are axially connected. The lower end of the adapter is connected to the upper end of the instrument adapter housing. The lower end of the instrument adapter housing is connected to the logging instrument. A reflux gasket is provided between the outer wall of the variable diameter conduit and the adapter. The reflux gasket is fixed to the lower part of the inner hole of the bypass stub. The side of the reflux gasket facing the circulation hole has a concave arc surface to receive mud impact. The concave arc surface forms a buffer cavity between the outer wall of the variable diameter conduit and the inner wall of the bypass stub.

[0005] Furthermore, the upper end of the inner wall of the drill bit adapter housing is provided with an upper straightening ring, and the lower end of the inner wall of the drill bit adapter housing is provided with a lower straightening ring. The upper straightening ring is used to radially straighten the turbine generator or the variable diameter adapter pipe, and the lower straightening ring is used to radially straighten the variable diameter through pipe.

[0006] Furthermore, an inner wall sleeve is provided below the upper centering ring. The inner wall sleeve is made of wear-resistant metal material and is used to prevent the eddy currents generated when the rotor of the turbine generator rotates from eroding the inner wall of the drill bit adapter housing.

[0007] Furthermore, the circulation holes are arranged in five rows along the axial direction on the sidewall of the bypass stub. The five rows of circulation holes are arranged in an alternating array. The diameter of the circulation holes in the odd-numbered rows is D1, and the diameter of the circulation holes in the even-numbered rows is D2, where D1 > D2.

[0008] Furthermore, the height H of the buffer cavity is 1.5 to 3 times the diameter D1 of the circulation orifice.

[0009] Furthermore, the side wall of the adapter is provided with a data reading interface, which is electrically connected to the circuit frame through a data reading plug, for directly reading logging data in the surface state.

[0010] Furthermore, the lower inner wall of the instrument adapter housing is provided with a pressure-bearing step, and a hard alloy pressure-bearing block is installed on the pressure-bearing step to protect the internal circuit frame from being crushed by axial load.

[0011] Furthermore, the variable diameter conduit includes an upper large diameter section and a lower small diameter section. The inner wall of the upper large diameter section is provided with a trapezoidal internal thread for connecting with the trapezoidal external thread of the turbine generator or the variable diameter adapter pipe. The electrical connection plug is installed on the end face of the lower small diameter section.

[0012] Furthermore, a sealing mounting groove is provided on the outer wall of the variable diameter conduit, and a sealing ring is disposed in the sealing mounting groove. The sealing ring is located in the area above the electrical connector and is used to block the intrusion path of high-pressure mud into the inner cavity of the electrical connector through the threaded connection gap.

[0013] Furthermore, the circuit framework includes a rectifier and voltage regulator module and a communication bus interface. When the turbine generator is connected, the rectifier and voltage regulator module is used to convert AC power to DC power. When the variable diameter adapter is connected to the LWD system, the communication bus interface is used for data communication via the Tbus bus.

[0014] The advantages and positive effects of this invention are: 1. This invention integrates mud bypass, pressure buffer, power generation / communication switching and multiple sealing protection functions on a single short section, significantly improving the safety and efficiency of vertical drilling operations.

[0015] 2. The multi-functional bypass conversion short section of the direct-drive logging instrument disclosed in this invention connects the drill string to the drill string via a drill string adapter shell and the logging instrument via an instrument adapter shell. The bypass short section ensures smooth drilling fluid circulation and has a built-in variable diameter through pipe and circuit frame for connecting to a turbine generator for rectification and power supply, or for connecting to an LWD system for communication and power supply. It can be converted to different thread types, thereby connecting the logging instrument string with the drill pipe for direct-drive operation, improving the operation capability of the logging instrument string in highly deviated wells. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0017] Figure 2 This is a partially enlarged view of the bypass section and internal conductive components in an embodiment of the present invention.

[0018] Figure 3 This is an enlarged view of the sealing and electrical connection structure at the connection between the variable diameter conduit and the conversion joint in an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the distribution of the circulation holes on the sidewall of the bypass short section according to an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the structure of the backflow gasket according to an embodiment of the present invention.

[0021] In the picture: 1. Drill string adapter housing; 2. Bypass sub; 3. Adapter joint; 4. Instrument adapter housing; 5. Variable diameter conduit; 6. Return gasket; 7. Turbine generator; 8. Circulation port; 9. Circuit frame. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] The embodiments of the present invention will be further described below with reference to the accompanying drawings: like Figure 1-5As shown, a multi-functional bypass conversion section for a direct drilling instrument includes, from top to bottom, a drill string adapter housing 1, a bypass section 2, a conversion connector 3, and an instrument adapter housing 4. The upper end of the drill string adapter housing 1 is connected to the drill string. The drill string adapter housing 1 is equipped with either a turbine generator 7 or a variable diameter adapter pipe, depending on the operational requirements. The turbine generator 7 or the variable diameter adapter pipe is connected to the upper end of the variable diameter through pipe 5. The lower end of the drill string adapter housing 1 is connected to the upper end of the bypass section 2.

[0024] Preferably, the reducing conduit 5 includes an upper large-diameter section and a lower small-diameter section. The inner wall of the upper large-diameter section is provided with a trapezoidal internal thread for connecting with the trapezoidal external thread of the turbine generator 7 or the reducing adapter pipe to withstand high torque. The lower small-diameter section of the reducing conduit 5 extends into the conversion connector 3, and the electrical connection plug is installed on the end face of the lower small-diameter section.

[0025] like Figure 4 As shown, the bypass sub 2 has circulation holes 8 on its sidewall. The axis of the circulation holes 8 is inclined downward relative to the axis of the bypass sub 2. Preferably, the circulation holes 8 are arranged in five rows along the axial direction on the sidewall of the bypass sub 2. The five rows of circulation holes 8 are staggered. The diameter of the odd-numbered rows (first, third, and fifth rows) of circulation holes 8 is D1, and the diameter of the even-numbered rows (second and fourth rows) of circulation holes 8 is D2, where D1 > D2. The large-diameter D1 holes and the small-diameter D2 holes are alternately distributed to balance the hydrodynamic field of the downhole annulus and reduce eddy vibration.

[0026] like Figure 2 As shown, the reducing conduit 5 is placed inside the bypass section 2. A circuit frame 9 is installed inside the reducing conduit 5. The lower end of the reducing conduit 5 extends into the adapter 3. The lower end of the bypass section 2 is connected to the upper end of the adapter 3. An electrical connection socket is provided at the upper end of the adapter 3. An electrical connection plug is installed on the lower end face of the reducing conduit 5. The electrical connection plug and the electrical connection socket are axially connected.

[0027] Preferably, the outer wall of the reducing conduit 5 is provided with a sealing installation groove, and the sealing ring is set in the sealing installation groove. The sealing ring is located in the area above the electrical connector plug and is used to block the intrusion path of high pressure mud into the inner cavity of the electrical connector plug through the threaded connection gap.

[0028] Preferably, the side wall of the adapter 3 is provided with a data reading interface, which is electrically connected to the circuit frame 9 via a data reading plug for directly reading logging data in surface conditions. The circuit frame includes a rectifier and voltage regulator module and a communication bus interface. When connected to the turbine generator 7, the rectifier and voltage regulator module is used to convert AC power to DC power. When connected to the variable diameter adapter to access the LWD system, the communication bus interface is used for data communication via the Tbus bus.

[0029] The lower end of the adapter 3 is connected to the upper end of the instrument adapter housing 4, and the lower end of the instrument adapter housing 4 is connected to the logging instrument. Preferably, the lower inner wall of the instrument adapter housing 4 is provided with a pressure-bearing step, and a hard alloy pressure-bearing block is installed on the pressure-bearing step to protect the internal circuit frame 9 from being crushed by axial load.

[0030] like Figure 3 , Figure 5 As shown, a backflow gasket 6 is provided between the outer wall of the reducing conduit 5 and the conversion joint 3. The backflow gasket 6 is fixed to the lower part of the inner hole of the bypass stub 2. The side of the backflow gasket 6 facing the circulation orifice 8 has a concave arc surface to receive the impact of mud. The concave arc surface forms a buffer cavity between the outer wall of the reducing conduit 5 and the inner wall of the bypass stub 2. Preferably, the height H of the buffer cavity is 1.5 to 3 times the diameter D1 of the circulation orifice.

[0031] Specifically, the upper end of the inner wall of the drill bit adapter housing 1 is provided with an upper aligning ring, and the lower end of the inner wall of the drill bit adapter housing 1 is provided with a lower aligning ring. The upper aligning ring is used to radially align the turbine generator or the reducing adapter pipe, and the lower aligning ring is used to radially align the reducing through pipe. This ensures that the internal conductive assembly is coaxially positioned at the center of the drill bit adapter housing 1.

[0032] Preferably, an inner wall sleeve is provided below the upper centering ring. The inner wall sleeve is made of wear-resistant metal material and is used to prevent the eddy currents generated when the rotor of the turbine generator rotates from eroding the inner wall of the drill bit adapter housing.

[0033] The working process of this invention is as follows: The slurry flows through the circulation orifice 8 and is injected into the buffer cavity formed by the return gasket 6, the outer wall of the variable diameter conduit 5, and the inner wall of the bypass stub 2. The concave arc surface disperses the concentrated jet, and the low-velocity fluid layer in the buffer cavity effectively counteracts the radial pressure difference, preventing radial deformation and vibration of the variable diameter conduit 5.

[0034] The multi-functional bypass switching section of this invention has three operating modes: Mode 1 (Power Generation and Supply Mode): Install turbine generator 7, drive power generation with mud, and use circuit frame 9 for rectification and voltage stabilization to supply power to the logging instruments below.

[0035] Mode 2 (Communication Mode): Install the reducer adapter pipe, connect to the LWD system, and transmit data through the communication bus interface of circuit frame 9.

[0036] Mode 3 (Pure Bypass Mode): The variable diameter through pipe 5 is fitted with a plug and serves only as a mud channel. The logging instrument is powered by a battery.

[0037] The advantages and positive effects of this invention are: 1. This invention integrates mud bypass, pressure buffer, power generation / communication switching and multiple sealing protection functions on a single short section, significantly improving the safety and efficiency of vertical drilling operations.

[0038] 2. The multi-functional bypass conversion short section of the direct-drive logging instrument disclosed in this invention connects the drill string to the drill string via a drill string adapter shell and the logging instrument via an instrument adapter shell. The bypass short section ensures smooth drilling fluid circulation and has a built-in variable diameter through pipe and circuit frame for connecting to a turbine generator for rectification and power supply, or for connecting to an LWD system for communication and power supply. It can be converted to different thread types, thereby connecting the logging instrument string with the drill pipe for direct-drive operation, improving the operation capability of the logging instrument string in highly deviated wells.

[0039] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A multi-functional bypass conversion section for a direct-induction well instrument, characterized in that: The system comprises, from top to bottom, a drill string adapter housing, a bypass sub, a conversion connector, and an instrument adapter housing. The upper end of the drill string adapter housing connects to the drill string. A turbine generator or a reducing adapter is installed inside the drill string adapter housing. The turbine generator or the reducing adapter is connected to the upper end of a reducing cable conduit. The lower end of the drill string adapter housing connects to the upper end of the bypass sub. The bypass sub has a circulation orifice on its side wall, with the axis of the circulation orifice inclined downwards relative to the axis of the bypass sub. The reducing cable conduit is located inside the bypass sub and contains a circuit frame. The lower end of the reducing cable conduit extends into the conversion connector. The bypass sub... The lower end is connected to the upper end of the conversion connector, the upper end of the conversion connector is provided with an electrical connection socket, the lower end face of the variable diameter through pipe is installed with an electrical connection plug, the electrical connection plug and the electrical connection socket are connected axially, the lower end of the conversion connector is connected to the upper end of the instrument adapter housing, the lower end of the instrument adapter housing is connected to the logging instrument, a reflux gasket is provided between the outer wall of the variable diameter through pipe and the conversion connector, the reflux gasket is fixed to the lower part of the inner hole of the bypass short section, the side of the reflux gasket facing the circulation hole is provided with a concave arc surface to receive mud impact, the concave arc surface forms a buffer cavity between the outer wall of the variable diameter through pipe and the inner wall of the bypass short section.

2. The multi-functional bypass conversion section for a direct-drive well instrument according to claim 1, characterized in that: The upper end of the inner wall of the drill bit adapter housing is provided with an upper straightening ring, and the lower end of the inner wall of the drill bit adapter housing is provided with a lower straightening ring. The upper straightening ring is used to radially straighten the turbine generator or the variable diameter adapter pipe, and the lower straightening ring is used to radially straighten the variable diameter through pipe.

3. The multi-functional bypass conversion section for a direct-drive well instrument according to claim 2, characterized in that: Below the upper centering ring is an inner wall sleeve made of wear-resistant metal material, which is used to prevent the eddy currents generated when the rotor of the turbine generator rotates from eroding the inner wall of the drill bit adapter housing.

4. A multi-functional bypass conversion section for a direct-drive well instrument according to any one of claims 1 to 3, characterized in that: The circulation holes are arranged in five rows along the axial direction on the side wall of the bypass stub. The five rows of circulation holes are arranged in an alternating array. The diameter of the circulation holes in the odd-numbered rows is D1, and the diameter of the circulation holes in the even-numbered rows is D2, where D1 > D2.

5. The multi-functional bypass conversion section for a direct-drive well instrument according to claim 4, characterized in that: The height H of the buffer cavity is 1.5 to 3 times the diameter D1 of the circulation orifice.

6. A multi-functional bypass conversion section for a direct-drive well instrument according to any one of claims 1 to 3, characterized in that: The side wall of the adapter is provided with a data reading interface, which is electrically connected to the circuit frame through a data reading plug, and is used to directly read logging data in the ground state.

7. A multi-functional bypass conversion section for a direct-drive well instrument according to any one of claims 1 to 3, characterized in that: The lower inner wall of the instrument adapter housing is provided with a pressure-bearing step, and a hard alloy pressure-bearing block is installed on the pressure-bearing step to protect the internal circuit frame from being crushed by axial load.

8. A multi-functional bypass conversion section for a direct-drive well instrument according to any one of claims 1 to 3, characterized in that: The variable diameter conduit includes an upper large diameter section and a lower small diameter section. The inner wall of the upper large diameter section is provided with a trapezoidal internal thread for connecting with the trapezoidal external thread of the turbine generator or the variable diameter adapter pipe. The electrical connection plug is installed on the end face of the lower small diameter section.

9. A multi-functional bypass conversion section for a direct-drive well instrument according to any one of claims 1 to 3, characterized in that: The outer wall of the variable diameter conduit is provided with a sealing installation groove, and a sealing ring is set in the sealing installation groove. The sealing ring is located in the area above the electrical connector and is used to block the intrusion path of high pressure mud into the inner cavity of the electrical connector through the threaded connection gap.

10. A multi-functional bypass conversion section for a direct-induction well instrument according to any one of claims 1 to 3, characterized in that: The circuit framework includes a rectifier and voltage regulator module and a communication bus interface. When connected to the turbine generator, the rectifier and voltage regulator module is used to convert AC power to DC power. When connected to the variable diameter adapter pipe to access the LWD system, the communication bus interface is used for data communication via the Tbus bus.

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