A temperature reduction device and method while drilling

Abstract

The application provides a drilling temperature reducing device and method, and belongs to the technical field of drilling, which comprises a refrigeration frame arranged in a drill bit; an input shaft is rotatably arranged in the refrigeration frame; one end of the input shaft is fixedly connected with a turbine through the refrigeration frame, and the other end is connected with a compression piston through a conversion mechanism; the compression piston is slidably arranged in the refrigeration frame; a balance spring, a heat dissipation net ring and a cold end plate are sequentially arranged at the end of the compression piston away from the turbine; the turbine rotation drives the reciprocating movement of the compression piston; under the joint action of the gas, the balance spring and the expansion piston, the compression piston and the expansion piston reciprocate with a certain phase difference; the compression effect of the gas in the heating cavity is greater than the expansion effect, heat is released to form high temperature, the expansion effect in the refrigeration cavity is greater than the compression effect, so that the cold end heat is absorbed to form low temperature, and then the cold end plate refrigeration is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of drilling, and in particular relates to a drilling-while-cooling device and method. Background Art

[0002] With the development of industrialization and the acceleration of economic growth, the demand for energy is also increasing. Shallow oil resources are now gradually being depleted, leading to a shift in exploration technology towards exploiting resources in deeper strata. Deep and ultra-deep formations often have unique geological environments, creating extremely harsh exploration environments. However, drilling equipment (LWD) must be installed inside the drill bit and must be able to withstand these harsh conditions. High temperatures pose a particular challenge to downhole LWD instruments. Therefore, enhancing the LWD instrument's high-temperature resistance is particularly important.

[0003] The existing invention patent application publication number is: CN110087439A, an electronic refrigeration and cooling system for downhole instruments, a generator is connected to a rectifier module, the rectifier module converts the AC power generated by the generator into DC power for driving a semiconductor refrigeration plate; the rectifier module is connected to a control module, the control module is simultaneously connected to a temperature sensor and a semiconductor refrigeration module, and the energy storage device is simultaneously connected to the rectifier module and the control module; the control module controls whether the DC power converted by the rectifier module is supplied to the energy storage device and the semiconductor refrigeration plate, and controls whether the energy storage device supplies power to the semiconductor refrigeration plate.

[0004] Although the above patent can provide cooling, it converts electrical energy into cold energy and has high environmental requirements. Therefore, it requires equipment that can always use the existing power in the exploration well for cooling. Summary of the Invention

[0005] In view of the above problems, the present invention proposes a cooling-while-drilling device, comprising: a refrigeration frame arranged inside a drill bit;

[0006] An input shaft is rotatably mounted in the refrigeration frame, one end of the input shaft passes through the refrigeration frame and is fixedly connected to the turbine, and the other end is connected to the compression piston through a conversion mechanism, and the compression piston is slidably mounted in the refrigeration frame;

[0007] The compression piston is sequentially mounted with a balancing spring, a heat dissipation mesh ring, and a cold end plate at one end away from the turbine; one end of the balancing spring is fixedly connected to a connecting seat provided in the refrigeration frame, and the other end is connected to the expansion piston; the expansion piston is mounted inside the heat dissipation mesh ring, and the other end of the heat dissipation mesh ring is connected to the cold end plate;

[0008] The refrigeration frame is filled with gas, and the rotation of the turbine drives the compression piston to reciprocate through the conversion mechanism. The gas pushes and the balance spring pulls the expansion piston to reciprocate with a phase difference with the compression piston.

[0009] Furthermore, the cooling device further comprises blades, which are slidably mounted on the input shaft and are located between the turbine and the refrigeration frame.

[0010] Furthermore, a push rod return spring, a blade adjustment push rod and a memory alloy are sequentially arranged in the input shaft, a conical surface is provided on the outer side of the blade adjustment push rod, and the conical surface is engaged with the conical inclined surface of the blade root; a blade return spring is provided inside the blade, and the blade return spring is in contact with the outer surface of the input shaft.

[0011] Furthermore, the conversion mechanism includes a driving gear, a driven gear and a crankshaft connecting rod;

[0012] The driving gear is connected to the input shaft, the driven gear is meshed with the driving gear and is transmission-connected to the input end of the crankshaft connecting rod, and the output end of the crankshaft connecting rod is connected to the compression piston.

[0013] Furthermore, the conversion mechanism further includes an outer magnetic ring and an inner magnetic ring.

[0014] The outer magnetic ring is fixedly connected to the input shaft; the inner magnetic ring is rotatably installed inside the outer magnetic ring, and the inner magnetic ring is connected to the driving gear through the transmission shaft. The outer magnetic ring and the inner magnetic ring are each sequentially built with multiple magnets with different magnetic poles.

[0015] Furthermore, a first secondary coil and a second secondary coil are provided on the heat dissipation mesh ring, and a primary coil is provided on the expansion piston, and the primary coil is directly opposite to the first secondary coil and the second secondary coil.

[0016] Furthermore, the first secondary coil generates an electromagnetic force to provide additional damping c for the expansion piston, and adjusts the phase difference between the compression piston and the expansion piston to The following relationship exists with c:

[0017] Where ω is the vibration frequency; k is the system stiffness; and m is the mass.

[0018] Furthermore, the cooling device further includes an insulating layer, which is arranged inside the refrigeration frame, and one end of the insulating layer wraps the cold end plate, and the cold end plate and the insulating layer form a cooling chamber.

[0019] Furthermore, the cooling device also includes a pressure-bearing shell and a filter guide head, and the pressure-bearing shell is installed on the outside of the refrigeration frame and the turbine; a filter guide head is installed at the end of the refrigeration frame facing the turbine, and a guide hole is provided on the filter guide head, and an outlet hole is provided on the refrigeration frame.

[0020] Furthermore, the cooling device further includes a heat insulation layer, which is installed inside the pressure shell and located between the blades and the refrigeration frame.

[0021] Furthermore, the pressure-bearing shell and the filter guide head are installed inside the tool nipple, and a mounting ring is installed between the pressure-bearing shell and the tool nipple.

[0022] A method for cooling while drilling, using the above device, comprises the following steps:

[0023] The mud drives the turbine to drive the compression piston to reciprocate linear motion, wherein the turbine drives the compression piston to reciprocate linear motion through a conversion mechanism;

[0024] The compression piston drives the expansion piston to reciprocate with a certain phase difference, wherein the expansion piston is pushed by the gas and the tension of the balance spring to reciprocate;

[0025] The expansion effect in the refrigeration cavity is greater than the compression effect, and the temperature of the cold end plate is absorbed in the refrigeration cavity to achieve cooling.

[0026] Beneficial effects:

[0027] 1. The present invention drives the compression piston to reciprocate through the rotation of the turbine. Under the combined action of gas, a balance spring, and an expansion piston, the compression piston and the expansion piston reciprocate with a certain phase difference. The compression effect of the gas in the heating chamber is greater than the expansion effect, releasing heat to form a high temperature. The expansion effect in the cooling chamber is greater than the compression effect, absorbing heat from the cold end to form a low temperature, thereby achieving cold-end plate cooling. The use of mechanical transmission cooling is less sensitive to ambient temperature and can operate stably within a wide temperature range.

[0028] 2. The present invention provides a second secondary coil on the heat dissipation mesh ring and a primary coil on the expansion piston, and utilizes the magnetic induction changes of the primary coil and the second secondary coil to obtain the movement frequency of the expansion piston, thereby realizing non-contact monitoring.

[0029] 3. The present invention can use helium as the working fluid, does not require any fuel consumption, does not require any chemical reaction, does not affect the normal operation of the power device, is environmentally friendly, energy-saving and environmentally friendly.

[0030] 4. The present invention is provided with a push rod return spring, a blade adjustment push rod and a memory alloy, thereby adjusting the position of the blade, thereby adjusting the contact area between the blade and the mud, and adjusting the input shaft rotation speed, thereby adapting to the flow fluctuation downhole.

[0031] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 The figure shows an overall cross-sectional diagram of the cooling-while-drilling device in an embodiment of the present invention.

[0034] Figure 2 A partial cross-sectional schematic diagram of a cooling-while-drilling device in an embodiment of the present invention is shown.

[0035] Figure 3 Shown Figure 2 An enlarged schematic diagram of the local section at point A.

[0036] Figure 4 Shown Figure 2 An enlarged schematic diagram of the local section at point B.

[0037] Figure 5 Shown Figure 2 An enlarged schematic diagram of the local section at point C.

[0038] Figure 6 Shown Figure 2 An enlarged schematic diagram of the local section at point D.

[0039] Figure 7 Shown Figure 2 An enlarged schematic diagram of the local section at point E.

[0040] Figure 8 A schematic cross-sectional view of the input shaft, outer magnetic ring and transmission shaft of the cooling while drilling device according to an embodiment of the present invention is shown.

[0041] Figure 9 A flow chart of a method for cooling while drilling according to an embodiment of the present invention is shown.

[0042] In the figure, 1, diversion hole; 2, filter guide head; 3, turbine; 4, blade adjustment push rod; 41, conical surface; 5, outflow hole; 6, thermal insulation layer; 7, input shaft; 8, outer magnetic ring; 9, inner magnetic ring; 10, driving gear; 11, driven gear; 12, crankshaft connecting rod; 121, crankshaft; 122, connecting rod; 13, compression piston; 14, balance spring; 15, heating chamber; 16, heat dissipation mesh ring; 17, first secondary Coil; 18. Second secondary coil; 19. Refrigeration chamber; 20. Insulation layer; 21. Blade; 22. Push rod return spring; 23. Blade return spring; 24. Memory alloy; 25. Pressure shell; 26. Expansion piston; 27. Primary coil; 28. Cold end plate; 29. ​​Cooling chamber; 30. Vibration damping ring; 31. Mounting ring; 32. Tool short section; 33. Drive shaft; 34. Refrigeration frame; 35. Compression piston frame. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0044] like Figure 1 As shown, Figure 1 FIG1 shows an overall cross-sectional diagram of a cooling-while-drilling device according to an embodiment of the present invention. Figure 1 A cooling-while-drilling device includes a cooling frame 34 disposed within the drill bit. An input shaft 7 is rotatably mounted within the cooling frame 34. One end of the input shaft 7 passes through the cooling frame 34 and is fixedly connected to the turbine 3. The other end of the input shaft 7 is connected to the compression piston 13 via a conversion mechanism. The compression piston 13 is slidably mounted within a compression piston frame 35 within the cooling frame 34. The cooling frame 34 is filled with high-pressure gas, such as helium, as the working fluid. This does not require any fuel consumption or chemical reaction, does not affect the normal operation of power devices, and is environmentally friendly, energy-saving, and environmentally friendly.

[0045] The end of the compression piston 13 away from the turbine 3 is provided with a balance spring 14 (refer to Figure 6), heat dissipation mesh ring 16 and cold end plate 28; one end of the balance spring 14 is fixedly connected to the connection seat set in the refrigeration frame 34, and the other end is connected to the expansion piston 26; the expansion piston 26 is installed inside the heat dissipation mesh ring 16, and the other end of the heat dissipation mesh ring 16 is connected to the cold end plate 28; the rotation of the turbine 3 drives the compression piston 13 to reciprocate through the conversion mechanism, and the expansion piston 26 is pushed by the gas and pulled by the balance spring 14 to perform a reciprocating motion with a phase difference with the compression piston 13. Since the expansion effect in the refrigeration chamber 19 is greater than the compression effect, the cold end plate 28 is cooled. The present invention adopts mechanical transmission cooling, has low sensitivity to ambient temperature, and can operate stably within a wide temperature range.

[0046] Specifically, the cooling device also includes a blade 21, which is slidably mounted on the input shaft 7 and is located between the turbine 3 and the refrigeration frame 34. The blade 21 slides and limits with the input shaft 7; the blade 21 rotates synchronously with the input shaft 7. The blade 21 is used to increase the area of ​​mud impact, thereby increasing the impact force and increasing the rotational speed. Specifically, the mud flows into the guide hole 1, passes through the turbine 3 and the blade 21, and flows out of the outlet hole 5. When the blade 21 approaches the filter guide head 2, the contact area between the blade 21 and the mud increases, and the force on the blade 21 increases, thereby increasing the rotational speed of the input shaft 7. When the blade 21 approaches the refrigeration frame 34, the contact area between the blade 21 and the mud decreases, and the force on the blade 21 decreases, thereby reducing the rotational speed of the input shaft 7.

[0047] refer to Figure 2 The input shaft 7 is provided with a push rod return spring 22, a blade adjustment push rod 4 and a memory alloy 24 (reference Figure 3 and Figure 4 ), a conical surface 41 is provided on the outside of the blade adjustment push rod 4, which engages with the conical inclined surface at the root of the blade 21; a blade return spring 23 is provided inside the blade 21, and the blade return spring 23 contacts the outer surface of the input shaft 7 to generate a preload. Specifically, a rod-shaped memory alloy 24 is placed in the input shaft 7 at the position of the heat insulation layer 6. The power supply and heating can increase its length by 10%, thereby pushing the blade adjustment push rod 4 to overcome the preload force of the push rod return spring 22 and move to the left (by Figure 1 For reference), the conical surface 41 of the blade adjustment push rod 4 is wedged with the conical inclined surface at the root of the blade 21, overcoming the pre-compression force of the blade return spring 23, pushing the blade 21 along the blade 21 toward the turbine 3; thereby increasing the area of ​​the blade 21 mud impact (reference Figure 2Mud flows into the guide hole 1, passes through the turbine 3 and blades 21, and flows out of the outlet hole 5. When blades 21 approach the filter guide head 2, the contact area between blades 21 and the mud increases, thereby increasing the force on blades 21 and increasing the speed of input shaft 7. When power is turned off, the memory alloy 24 cools down and its length shortens. Under the action of the blade return spring 23 and the push rod return spring 22, the blade adjustment push rod 4 and the turbine 3 blades 21 return to their initial positions. The memory alloy 24 can then adjust the electrical power of the memory alloy 24 according to the required length, thereby adaptively adjusting the extension length of the adjustable-length blades 21, ensuring that the turbine 3 adaptively stabilizes at the required speed under various operating conditions.

[0048] Specifically, the conversion mechanism includes a driving gear 10, a driven gear 11 and a crankshaft connecting rod 12; the driving gear 10 is connected to the input shaft 7, the driven gear 11 is meshed with the driving gear 10 and is connected to the input end of the crankshaft connecting rod 12, and the output end of the crankshaft connecting rod 12 is connected to the compression piston 13. The driven gear 11 and the driving gear 10 are used to convert the transmission from horizontal rotation to vertical rotation, and the crankshaft connecting rod 12 is used to convert the rotation into reciprocating linear movement. The crankshaft connecting rod 12 includes a crankshaft 121 and a connecting rod 122 (refer to Figure 5 ), the connecting rod 122 is rotatably mounted on the eccentric shaft of the crankshaft 121 through a bearing, and the connecting rod 122 is caused to perform reciprocating linear motion through the eccentric shaft.

[0049] In the above embodiment, another optional implementation is that the conversion mechanism also includes an outer magnetic ring 8 and an inner magnetic ring 9. The outer magnetic ring 8 is arranged inside the refrigeration frame 34, and the outer magnetic ring 8 is fixedly connected to the input shaft 7; the inner magnetic ring 9 is rotatably installed inside the outer magnetic ring 8, and the inner magnetic ring 9 is connected to the driving gear 10 through the transmission shaft 33. The outer magnetic ring 8 and the inner magnetic ring 9 are each built with multiple magnets with different magnetic poles. Specifically, the outer magnetic ring 8 rotates to drive the inner magnetic ring 9 to rotate. The outer magnetic ring 8 and the inner magnetic ring 9 are both composed of multiple magnets with different magnetic poles, and the magnetic poles of adjacent magnets are opposite (such as Figure 8 As shown in the figure, when the outer magnetic ring 8 rotates, the magnetic field changes, thereby driving the rotation of the inner magnetic ring 9. The outer magnetic ring 8 and the inner magnetic ring 9 are provided to provide torque overload protection, and drive the driving gear 10 and the driven gear 11 to cooperate to transmit power to the crankshaft connecting rod 12, thereby driving the compression piston 13 to reciprocate. The compression piston 13 periodically generates pressure waves in the refrigeration frame 34. Under the combined action of the gas, the balance spring 14 and the expansion piston 26, the compression piston 13 and the expansion piston 26 reciprocate with a certain phase difference. The compression effect of the gas in the heating chamber 15 is greater than the expansion effect, releasing heat to form a high temperature. The expansion effect in the refrigeration chamber 19 is greater than the compression effect, thereby absorbing heat from the cold end to form a low temperature, and establishing a stable temperature gradient at the heat dissipation mesh ring 16.

[0050] In the embodiment of the present invention, a first secondary coil 17 and a second secondary coil 18 are provided on the heat dissipation mesh ring 16, and a primary coil 27 is provided on the expansion piston 26. The primary coil 27 is directly opposite to the first secondary coil 17 and the second secondary coil 18 (refer to Figure 7 Specifically, the primary coil 27 is mounted on the expansion piston 26. The change in magnetic induction between the primary coil 27 and the second secondary coil 18 can be used to determine the movement frequency of the expansion piston 26, enabling non-contact monitoring. The electromagnetic force generated by the first secondary coil 17 can be used to provide additional damping for the expansion piston 26, adjusting the phase difference between the compression piston 13 and the expansion piston 26. Specifically, the gas circulation within the cooling device includes the following four stages:

[0051] (1) Isothermal compression stage: The compression piston 13 moves to the right, and the gas is isothermally compressed in the compression chamber (the cavity between the compression piston 13 and the expansion piston 26). To maintain the isothermal state in the compression chamber, the gas in the chamber transfers heat to the outside through the heat dissipation mesh ring 16;

[0052] (2) Isochoric heat release stage: The expansion piston 26 and the compression piston 13 move to the right simultaneously, and the gas volume remains unchanged until the compression piston 13 reaches the right dead center. The gas completes heat release and the temperature drops from Th to Tc.

[0053] (3) During the isothermal expansion phase, the expansion piston 26 moves to the right, and the gas expands isothermally in the refrigeration chamber 19. To maintain the isothermal state in the expansion chamber, the gas in the chamber absorbs heat from the outside through the thin wall, achieving a cooling effect throughout the entire cycle.

[0054] (4) Isochoric heat absorption stage: The compression piston 13 and the expansion piston 26 move to the left at the same time, and the gas volume remains unchanged until the two move synchronously to the left dead center. The gas completes heat absorption, the temperature rises from Tc to Th, and enters the next working cycle.

[0055] The difference in phase angle between the reciprocating motion of compression piston 13 and expansion piston 26 within a single operating cycle is called the phase difference. This means that the compression piston and expansion piston reciprocate at the same frequency but asynchronously, with the difference in the asynchronous phases being the phase difference. The above steps describe the ideal motion state of the two pistons.

[0056] In accordance with the embodiment of the present invention, the primary coil 27 generates an electromagnetic force to provide additional damping c for the expansion piston 26, and adjusts the phase difference between the compression piston 13 and the expansion piston 26 to be The following relationship exists with c:

[0057] Where c is the damping; ω is the vibration frequency; k is the system stiffness; and m is the mass.

[0058] Specifically, in this embodiment, a primary coil 27 is installed on the expansion piston 26 of the closed pneumatic refrigeration unit. The electromagnetic force generated by the first secondary coil 17 can be used to provide additional damping for the expansion piston 26, thereby adjusting the phase difference between the compression piston 13 and the expansion piston 26 ( Phase can be achieved by changing the system damping c Where c is damping; ω is vibration frequency; k is system stiffness; and m is mass), thereby controlling the cooling capacity. The movement frequency of the expansion piston 26 can be obtained by utilizing the change in magnetic induction between the primary coil 27 and the second secondary coil 18, thereby achieving non-contact movement frequency monitoring (using the primary coil 27 to monitor the magnetic induction intensity of the second secondary coil 18).

[0059] Furthermore, the cooling device also includes an insulating layer 20, which is arranged inside the refrigeration frame 34, and one end of the insulating layer 20 is wrapped around the cold end plate 28, and the cold end plate 28 and the insulating layer 20 form a cooling chamber 29. The cooling chamber 29 is used to form a closed low-temperature insulating space for placing and protecting the downhole instrument while drilling circuit system. In this embodiment, the circuit cooling unit includes the insulating layer 20 and the cooling chamber 29 surrounded by the cold end plate 28 and the insulating layer 20, which are used to form a closed low-temperature insulating space to provide a stable and safe working environment temperature for the downhole instrument while drilling circuit system; the connection between the circuit cooling unit and the cold end plate 28 needs to be filled with a thermally conductive material to fill the gap between the mating surfaces, so as to maximize the cooling capacity of the closed pneumatic refrigeration unit.

[0060] refer to Figure 1 The cooling device also includes a pressure shell 25 and a filter guide head 2. The pressure shell 25 is installed on the outside of the refrigeration frame 34 and the turbine 3; a filter guide head 2 is installed on the end of the refrigeration frame 34 facing the turbine 3, a guide hole 1 is provided on the filter guide head 2, and an outlet hole 5 is provided on the refrigeration frame 34. A vibration damping ring 30 is provided between the refrigeration frame 34 and the pressure shell 25 to reduce the impact on the refrigeration frame 34 and reduce vibration. The mud flows in from the guide hole 1, passes through the turbine 3 and the blades 21, and flows out from the outlet hole 5. The cooling device also includes a heat insulation layer 6. The heat insulation layer 6 is installed inside the pressure shell 25 and is located between the blades 21 and the refrigeration frame 34, and blocks the outlet hole 5 and the guide hole 1 on one side. A sealing rubber ring is installed between the insulation layer 6 and the input shaft 7, and a sealing rubber ring (such as Figure 4 The Y-ring seal shown is used to insulate the mud from heat and to block the mud.

[0061] In the implementation of the present invention, the pressure shell 25 and the filter guide head 2 are installed inside the tool short section 32, and a mounting ring 31 is installed between the pressure shell 25 and the tool short section 32. The mounting ring 31 is used to reduce the adverse effects of downhole vibration on the drilling cooling device; a mounting ring 31 is provided between the pressure shell 25 and the tool short section 32, and the mounting ring 31 is hollow, used for conducting downhole mud and installing and positioning the pressure shell 25. The filter guide head 2 is installed on the pressure shell 25 to form a fixed flow channel. The mud is guided from the mud inlet through the guide hole 1 to the mud-driven turbine 3, which drives the input shaft 7 and the outer magnetic ring 8 to rotate synchronously, and flows to the mud outlet through the outlet hole 5 and the mounting ring 31.

[0062] Working principle: In this embodiment, the turbine 3 of the mud direct-drive turbine power unit is impacted by the mud guided by the guide hole 1 of the filter guide head 2, and the turbine 3 and the blade 21 are converted into the kinetic energy of the fluid into the rotation of the input shaft 7, and the input shaft 7 drives the outer magnetic ring 8 to rotate; the input shaft 7 in the heat insulation layer 6 is installed with a rod-shaped memory alloy 24, and the elongation degree can be controlled by supplying power and heating it, thereby pushing the blade adjustment push rod 4 to overcome the pre-compression force of the push rod return spring 22 and move to the left, and the conical surface 41 of the blade adjustment push rod 4 is aligned with the conical oblique surface 41 at the root of the blade 21. The surfaces are wedged together to overcome the pre-compression force of the push rod return spring 22, and the push rod return spring 22 pushes the blade 21 to move along the blade 21 in the direction away from the outer magnetic ring 8, thereby increasing the area of ​​the blade 21 impacted by the mud. When the power is stopped, the memory alloy 24 cools down and its length is shortened. Under the action of the blade return spring 23 and the push rod return spring 22, the blade adjustment push rod 4, the turbine 3 and the blade 21 return to their initial positions, thereby reducing the area of ​​the blade 21 impacted by the mud, so that it can adaptively stabilize at the required speed under different working conditions.

[0063] The outer magnetic ring 8 and the inner magnetic ring 9 are both composed of multiple magnets with different magnetic poles, and the magnetic poles of adjacent magnets are opposite (such as Figure 8As shown), when the outer magnetic ring 8 rotates, the magnetic field changes, thereby driving the rotation of the inner magnetic ring 9, and the inner magnetic ring 9 drives the transmission shaft 33 to rotate, and the transmission shaft 33 drives the driving gear 10 and then drives the driven gear 11 to rotate (the driven gear 11 and the driving gear 10 are used to convert horizontal rotation into vertical rotation); the driven gear 11 drives the crankshaft 121 to rotate, and the crankshaft 121 drives the connecting rod 122 to rotate along the center of the eccentric shaft of the crankshaft 121 (a bearing is installed between the crankshaft 121 and the connecting rod 122, and the eccentric shaft of the crankshaft 121 is interference fit with the inner ring of the bearing, and one end of the connecting rod 121 is interference fit with the outer ring of the bearing). When the crankshaft 121 rotates, the eccentric shaft performs circular motion with the two ends of the crankshaft 121 as the center. Since one end of the connecting rod 122 is connected to the eccentric shaft through a bearing and the other end is connected to the compression piston 13, it can drive the compression piston 13 confined in the cylinder to achieve reciprocating linear motion; the compression piston 13 is performing reciprocating linear motion When the expansion piston 26 is pushed by the gas and pulled by the balance spring 14, the compression piston 13 and the expansion piston 26 reciprocate with a certain phase difference. At the same time, the primary coil 27 is installed on the expansion piston 26. The movement frequency of the expansion piston 26 can be obtained by using the magnetic induction change of the primary coil 27 and the second secondary coil 18 to achieve non-contact monitoring; the current flowing through the first secondary coil 17 can be adjusted to thereby adjust the electromagnetic force generated by the first secondary coil 17 to provide additional damping for the expansion piston 26, and adjust the phase difference between the compression piston 13 and the expansion piston 26; the expansion effect in the refrigeration chamber 19 is greater than the compression effect, thereby generating a stable temperature gradient at the heat dissipation network ring 16, and finally releasing heat to the outside at the heating chamber 15 to form a high temperature zone, absorbing the temperature of the cold end plate 28 at the refrigeration chamber 19 to form a low temperature zone, thereby keeping the active cooling chamber 29 at a low temperature, thereby protecting the electrical components inside the active cooling chamber 29.

[0064] refer to Figure 9 A method for cooling while drilling, using the above-mentioned device, comprises the following steps:

[0065] The mud drives the turbine 3 to drive the compression piston 13 to reciprocate linearly, wherein the turbine 3 drives the compression piston 13 to reciprocate linearly through the conversion mechanism;

[0066] The compression piston 13 drives the expansion piston 26 to reciprocate with a certain phase difference, wherein the expansion piston 26 is pushed by the gas and the tension of the balance spring 14 to reciprocate;

[0067] The expansion effect in the refrigeration cavity 19 is greater than the compression effect, and the temperature of the cold end plate 28 is absorbed in the refrigeration cavity 19 to achieve cooling.

[0068] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cooling-while-drilling device, characterized in that: include: a cooling frame (34) disposed inside the drill bit; An input shaft (7) is rotatably mounted in the refrigeration frame (34), one end of the input shaft (7) passes through the refrigeration frame (34) and is fixedly connected to the turbine (3), and the other end is connected to the compression piston (13) through a conversion mechanism, and the compression piston (13) is slidably mounted inside the refrigeration frame (34); The end of the compression piston (13) away from the turbine (3) is sequentially mounted with a balance spring (14), a heat dissipation mesh ring (16) and a cold end plate (28); one end of the balance spring (14) is fixedly connected to a connection seat provided in the refrigeration frame (34), and the other end is connected to the expansion piston (26); the expansion piston (26) is mounted inside the heat dissipation mesh ring (16), and the other end of the heat dissipation mesh ring (16) is connected to the cold end plate (28); The refrigeration frame (34) is filled with gas, and the turbine (3) rotates to drive the compression piston (13) to reciprocate through the conversion mechanism. The gas pushes and the balance spring (14) pulls to make the expansion piston (26) reciprocate with a phase difference with the compression piston (13); A first secondary coil (17) and a second secondary coil (18) are provided on the heat dissipation mesh ring (16), and a primary coil (27) is provided on the expansion piston (26), wherein the primary coil (27) faces the first secondary coil (17) and the second secondary coil (18); The first secondary coil (17) generates an electromagnetic force to provide additional damping c for the expansion piston (26), and adjusts the phase difference between the compression piston (13) and the expansion piston (26) to 𝜑.

2. The cooling-while-drilling device according to claim 1, characterized in that: The cooling device further comprises a blade (21), wherein the blade (21) is slidably mounted on the input shaft (7) and is located between the turbine (3) and the refrigeration frame (34).

3. The cooling-while-drilling device according to claim 2, characterized in that: A push rod return spring (22), a blade adjustment push rod (4) and a memory alloy (24) are sequentially arranged in the input shaft (7); a conical surface (41) is arranged on the outer side of the blade adjustment push rod (4); the conical surface (41) is engaged with the conical inclined surface at the root of the blade (21); a blade return spring (23) is arranged inside the blade (21), and the blade return spring (23) contacts the outer surface of the input shaft (7).

4. The cooling-while-drilling device according to claim 1, characterized in that: The conversion mechanism comprises a driving gear (10), a driven gear (11) and a crankshaft connecting rod (12); The driving gear (10) is connected to the input shaft (7), the driven gear (11) is meshed with the driving gear (10) and is transmission-connected to the input end of the crankshaft connecting rod (12), and the output end of the crankshaft connecting rod (12) is connected to the compression piston (13).

5. The cooling-while-drilling device according to claim 4, characterized in that: The conversion mechanism further includes an outer magnetic ring (8) and an inner magnetic ring (9). The outer magnetic ring (8) is fixedly connected to the input shaft (7); the inner magnetic ring (9) is rotatably mounted inside the outer magnetic ring (8), and the inner magnetic ring (9) is connected to the driving gear (10) via the transmission shaft (33). The outer magnetic ring (8) and the inner magnetic ring (9) are each sequentially built with a plurality of magnets having different magnetic poles.

6. The cooling-while-drilling device according to claim 1, characterized in that: 𝜑 and c have the following relationship: , where ω is the vibration frequency; k is the system stiffness; and m is the mass.

7. The cooling while drilling device according to claim 1, characterized in that: The cooling device further comprises an insulating layer (20), the insulating layer (20) being arranged inside the refrigeration frame (34), and one end of the insulating layer (20) wraps around a cold end plate (28), and the cold end plate (28) and the insulating layer (20) form a cooling chamber (29).

8. The cooling while drilling device according to claim 1, characterized in that: The cooling device further comprises a pressure-bearing shell (25) and a filter guide head (2), wherein the pressure-bearing shell (25) is mounted on the outside of the refrigeration frame (34) and the turbine (3); a filter guide head (2) is mounted on one end of the refrigeration frame (34) facing the turbine (3), a guide hole (1) is provided on the filter guide head (2), and an outlet hole (5) is provided on the refrigeration frame (34).

9. The cooling-while-drilling device according to claim 8, characterized in that: The cooling device further comprises a heat insulating layer (6), which is installed inside the pressure-bearing shell (25) and located between the blades (21) and the refrigeration frame (34).

10. The cooling-while-drilling device according to claim 8, wherein the pressure-bearing shell (25) and the filter guide head (2) are installed inside the tool short section (32), and a mounting ring (31) is installed between the pressure-bearing shell (25) and the tool short section (32).

11. A method for cooling while drilling, characterized in that: The device according to any one of claims 1 to 10 comprises the following steps: The mud drives the turbine (3) to drive the compression piston (13) to reciprocate linearly, wherein the turbine (3) drives the compression piston (13) to reciprocate linearly through a conversion mechanism; The compression piston (13) drives the expansion piston (26) to reciprocate with a certain phase difference, wherein the expansion piston (26) is pushed by the gas and pulled by the balance spring (14) to reciprocate; The expansion effect in the refrigeration cavity (19) is greater than the compression effect, and the temperature of the cold end plate (28) is absorbed in the refrigeration cavity (19) to achieve cooling.

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