CN111212548B - Magnetic pole driving cooling system and method for while-drilling instrument circuit system - Google Patents
Magnetic pole driving cooling system and method for while-drilling instrument circuit system Download PDFInfo
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- CN111212548B CN111212548B CN201911069922.7A CN201911069922A CN111212548B CN 111212548 B CN111212548 B CN 111212548B CN 201911069922 A CN201911069922 A CN 201911069922A CN 111212548 B CN111212548 B CN 111212548B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/202—Air circulating in closed loop within enclosure wherein heat is removed through heat-exchangers
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/20145—Means for directing air flow, e.g. ducts, deflectors, plenum or guides
Abstract
The invention relates to a magnetic pole driving cooling system and method for a circuit system of an instrument while drilling. The invention uses the piston to apply expansion action to the circulating working medium in the cylinder, so that the volume of the circulating working medium is increased, the pressure is reduced, the temperature is reduced, the circulating working medium has heat absorption capacity, and the temperature of a downhole circuit connected with the circulating working medium is reduced. The expansion cylinder and the compression cylinder are designed according to the reverse Stirling cycle principle, and the combined action of the turbine rotating device and the magnetic pole driving device is utilized to realize four refrigeration cycle processes of isothermal compression, isovolumetric heat release, isothermal expansion and isovolumetric heat absorption of a circulating working medium, so that the heat on a circuit system is absorbed by an expansion cavity, the heat is transferred into a compression cavity, and the heat is further released into the environment, thereby reducing the temperature of the circuit system, and avoiding the phenomena of shortening the service life or losing efficacy.
Description
Technical Field
The invention relates to a circuit cooling system and a circuit cooling method, belongs to the technical field of drilling, and particularly relates to a magnetic pole driving cooling system and a magnetic pole driving cooling method for a circuit system of an instrument while drilling.
Background
The formation of oil and gas well boreholes is produced by the rotation of a drill string to drive a drill bit or a downhole power drill to drive the drill bit to cut underground rock formations, and the drill bit and downhole tools are required to extend thousands of meters into the borehole.
In order to mitigate risk factors associated with drilling operations during drilling, it is desirable to obtain as much of the information of the downhole environment as possible, such as: geological parameters, engineering parameters, process parameters, etc. The near-bit attachment at the bottom of the drill string is therefore equipped with various measuring tools, such as: measurement While Drilling (MWD) and Logging While Drilling (LWD). The circuitry on these tools includes various electronic or sensing elements to perform the functions of data acquisition, processing, storage, and transmission. These downhole circuits themselves generate heat during operation; meanwhile, the high temperature in the well during the drilling process can also affect the well.
In general, there are two modes of high Wen Youfa circuitry failure. First, thermal stress on the circuitry reduces its useful life; second, when the temperature reaches a threshold, the circuitry fails and stops operating. Failure caused by overheating not only results in increased costs by replacement of the failed circuitry, but also interrupts the drilling activity, requiring tripping to replace the circuitry, which also consumes drilling time and increases drilling costs.
Currently, there are three approaches for solving the problem of high temperature resistance of underground circuits in the petroleum industry: firstly, screening out components which can be used at high temperature through high-temperature examination; secondly, customizing a Gao Wenyuan-resistant device; thirdly, a huge amount of expenses are invested, and high-temperature-resistant underground circuits are independently researched and developed. The measures are all to solve the problems from the point of passive 'temperature resistance' of the components and parts, and the high temperature resistance effect is limited; meanwhile, the high-temperature packaging technology of components is still a bottleneck problem.
Therefore, it is important and highly desirable to provide an efficient and stable active cooling system for downhole circuitry.
Disclosure of Invention
In order to solve the problem that the service life of the underground circuit is shortened and even fails when the underground circuit is in a high-temperature environment, the invention provides a magnetic pole driving cooling system and a magnetic pole driving cooling method for a circuit system of an instrument while drilling, which enable the underground circuit to be always maintained in an bearable temperature range and keep normal operation of the underground circuit.
The invention is realized by the following technical scheme:
a pole drive cooling system for while drilling instrument circuitry, comprising:
the turbine rotating device is arranged in an eccentric water hole of the drill collar body and is connected with the rotating shaft, the rotating shaft is provided with a first expansion cylinder magnetic pole and a first compression cylinder magnetic pole in a staggered manner along the axial direction, and the projection of the first expansion cylinder magnetic pole and the first compression cylinder magnetic pole on the horizontal plane forms an included angle which is different from zero;
an expansion cylinder divided into an expansion chamber and an ambient temperature chamber by an expansion piston having a second expansion cylinder pole through which the expansion piston is driven to reciprocate by the first expansion cylinder pole;
a compression cylinder, in which a compression piston with a second compression cylinder pole is arranged, and a compression chamber in communication with the ambient temperature chamber; the compression piston is driven to reciprocate by the first compression cylinder magnetic pole through the second compression cylinder magnetic pole.
Preferably, the magnetic pole driving cooling system for the while-drilling instrument circuit system, the turbine rotating device comprises:
the fixed turbine is arranged in the water hole through the fixing device, and the blade of the fixed turbine and the axial direction of the drill collar form an included angle which is not zero;
the movable turbine is arranged in the water hole through the rolling support device, and an inclination angle exists between the blades of the movable turbine and the blades of the fixed turbine; the movable turbine is connected with the rotating shaft.
Preferably, in the magnetic pole driving cooling system for the while-drilling instrument circuit system, the phase angle of the first expansion cylinder magnetic pole leads the phase angle of the first compression cylinder magnetic pole in the rotating direction of the rotating shaft.
Preferably, in the magnetic pole driving cooling system for the while-drilling instrument circuit system, a regenerator is arranged in the expansion piston.
Preferably, in the magnetic pole driving cooling system for the while-drilling instrument circuit system, the second expansion cylinder magnetic pole is of a circular ring structure, and working media in the expansion cavity and the ambient temperature cavity pass through a regenerator arranged in the expansion piston and in and out of the center of the circular ring structure.
Preferably, in the magnetic pole driving cooling system for the while-drilling instrument circuit system, a separate pipe is arranged in the drill collar body, and the separate pipe is used for separating the expansion cylinder from the compression cylinder.
A pole drive cooling method for while-drilling instrument circuitry, comprising:
a turbine rotating device arranged in an eccentric water hole of the drill collar body rotates to drive a rotating shaft provided with a first expansion cylinder magnetic pole and a first compression cylinder magnetic pole to rotate;
the first expansion cylinder magnetic pole acts on the second expansion cylinder magnetic pole in the expansion cylinder to drive the expansion piston arranged in the expansion cylinder to reciprocate;
the first compression cylinder magnetic pole acts on the second compression cylinder magnetic pole in the compression cylinder to drive the compression piston arranged in the compression cylinder to reciprocate;
wherein the expansion cylinder is in communication with the compression cylinder.
Preferably, the magnetic pole driving cooling method for the while-drilling instrument circuit system comprises one or more of the following steps:
isothermal compression, namely keeping an expansion piston motionless, and gradually increasing the stroke of the compression piston from zero to isothermally compress working medium gas;
an isovolumetric heat release step, wherein the stroke of an expansion piston is gradually increased from zero, the stroke of a compression piston synchronously reaches the maximum gradually from non-zero, and working medium gas enters an ambient temperature cavity in the expansion cylinder from a compression cavity of the compression cylinder and then enters the expansion cavity through the expansion piston; when passing through the expansion piston, the circulating working medium releases heat to a heat regenerator arranged in the expansion piston;
isothermal expansion, namely keeping the compression piston at the maximum stroke, and gradually enabling the stroke of the expansion piston to reach the maximum from non-zero so as to expand working medium gas in an expansion cavity;
and in the isovolumetric heat absorption step, the compression piston and the expansion piston are reset to zero positions together from the maximum stroke, and working medium gas enters the environment cavity from the expansion cavity through the expansion piston and finally enters the compression cavity. When passing through the expansion piston, the circulating working medium absorbs heat from a regenerator arranged in the expansion piston.
Preferably, in the magnetic pole driving cooling method for the while-drilling instrument circuit system, a regenerator is arranged in the expansion piston.
Preferably, in the magnetic pole driving cooling method for the while-drilling instrument circuit system, a separate pipe is arranged in the drill collar body, and the separate pipe is used for separating the expansion cylinder from the compression cylinder.
Thus, the advantages of the present invention are as follows: 1. the temperature of the circulating working medium is reduced (lower than the ambient temperature) in the expansion process of the expansion cavity, and the method of absorbing heat from the environment is adopted to actively reduce the temperature of the underground circuit; 2. the turbine rotating device and the magnetic pole driving device are combined to make the compression cylinder and the expansion cylinder reciprocate in a linear mode, so that heat of the circuit system is transferred from the expansion cavity to the compression cavity and then released into the environment, continuous cooling of an underground circuit can be guaranteed, and service life and stability of the underground circuit are improved.
Drawings
FIG. 1 is a diagram of a pole drive cooling system;
FIG. 2 is a schematic diagram of pole drive cooling;
FIG. 3 is a schematic diagram of a compression cylinder;
FIG. 4 is a schematic diagram of an expansion cylinder
FIG. 5 is a schematic diagram of the expansion chamber advanced compression chamber phase angle;
FIG. 6 is a piston state diagram of a pole drive cooling system;
FIG. 7 is a piston stroke diagram of a pole drive cooling system;
FIG. 8 is a reverse Stirling cycle pressure-Rong Tu;
FIG. 9 is a temperature-entropy diagram of a reverse Stirling cycle;
in the figure: 1: eccentric water hole; 2: a cooling device of the instrument while drilling; 3: a circuit hatch; 4: a drill collar body; 5: a turbine is fixed; 6: a fixing device; 7: a moving turbine; 8: a rolling support device; 9: a first expansion cylinder pole; 10: a rotation shaft; 11: a first compression cylinder pole; 12: the direction of heat discharge of the compression cavity; 13: a compression cylinder; 14: a split pipe; 15: the direction of heat absorption of the expansion cavity; 16: a circuit system; 17: an expansion cylinder; 18: magnetic lines of force; 19: a compression chamber; 20: compressing air holes of the air cylinder; 21: a second compression cylinder pole; 22: compressing a piston return spring; 23: a compression piston; 24: compressing piston dynamic seal; 25: expansion piston (built-in regenerator); 26: an ambient temperature chamber; 27: an expansion cylinder air hole; 28: a second expansion cylinder pole; 29: an expansion piston return spring; 30: an expansion chamber; 31: and (5) dynamic sealing of the expansion piston.
Detailed Description
The technical scheme of the invention is further specifically described below through specific embodiments and with reference to the accompanying drawings.
Examples:
as shown in fig. 1, a magnetic pole driving cooling system for a circuit system of an instrument while drilling according to the present embodiment includes: the drill collar comprises a drill collar body 4, a turbine rotating device, a magnetic pole driving device, a compression cylinder 13, an expansion cylinder 17, a split pipe 14, a circulating working medium and a circuit system;
as shown in fig. 1, the drill collar body 4 is designed into a water hole eccentric structure, and a compression cylinder cabin and an expansion cylinder cabin are arranged on the side wall of the drill collar body; the compression cylinder cabin body is used for placing a compression cylinder; the expansion cylinder cabin body is used for placing an expansion cylinder; a connecting hole is formed between the compression cylinder cabin and the expansion cylinder cabin and used for the passing of the split pipe 14; the drill collar body 4 is made of non-magnetic materials so as to avoid interference with a magnetic pole driving device;
the turbine rotating device comprises a fixed turbine 5 and a movable turbine 7; the fixed turbine 5 is fixed in the water hole through a fixing device; the blades on the fixed turbine 5 have a certain inclination angle with the axial direction of the drill string during design and are used for changing the flow direction of drilling fluid; the moving turbine is fixed in the water hole through the rolling support device; the upper blades of the movable turbine and the upper blades of the fixed turbine have a certain inclination angle relationship so as to control the hydraulic energy of the drilling fluid for flushing the blades of the movable turbine, thereby controlling the rotation speed of the movable turbine; the lower end of the driven turbine is fixed with a rotating shaft, and the driven turbine rotates together;
the magnetic pole driving device comprises an expansion cylinder magnetic pole and a compression cylinder magnetic pole; the expansion cylinder magnetic pole consists of a first expansion cylinder magnetic pole fixed on the rotating shaft and a second expansion cylinder magnetic pole fixed on the expansion piston; the first expansion cylinder magnetic pole applies magnetic force to the second expansion cylinder magnetic pole periodically in the process of rotating along with the rotating shaft so as to enable the expansion piston to do periodic reciprocating linear motion in the expansion cylinder;
the compression cylinder magnetic pole consists of a first compression cylinder magnetic pole fixed on the rotating shaft and a second compression cylinder magnetic pole fixed on the compression piston; the first compression cylinder magnetic pole applies magnetic force to the second compression cylinder magnetic pole periodically in the process of rotating along with the rotating shaft so as to enable the compression piston to do periodic reciprocating linear motion in the compression cylinder; the first expansion cylinder pole is arranged to lead the first compression cylinder pole by a certain phase angle;
the compression cylinder comprises a compression cavity, a compression cylinder air hole, a second compression cylinder magnetic pole, a compression piston return spring, a compression piston and a compression piston dynamic seal; the compression cavity is separated from the compression piston return spring cavity through the compression piston and the compression piston dynamic seal, so that the circulating working medium cannot enter the compression piston return spring cavity to be compressed; the second compression cylinder magnetic pole interacts with the first compression cylinder magnetic pole, so that the function of extending the compression piston is realized; the compression piston reset spring realizes the function of resetting the compression piston;
the expansion cylinder comprises an expansion piston (internally provided with a heat regenerator), an ambient temperature cavity, an expansion cylinder air hole, a second expansion cylinder magnetic pole, an expansion piston return spring, an expansion cavity and an expansion piston dynamic seal; the inside of the expansion piston (the built-in heat regenerator) is filled with a filler for heat exchange with the working medium, so that the heat is absorbed when the working medium enters the expansion cavity, the temperature of the working medium is reduced, the heat is released when the working medium leaves the expansion cavity, and the temperature of the working medium is increased; the second expansion cylinder magnetic pole adopts a circular ring structure so that a circulating working medium enters and exits the regenerator arranged in the expansion piston from the center of the circular ring; the expansion cavity, the expansion piston (internally provided with a heat regenerator) and the ambient temperature cavity are communicated with each other, and the pressure is equal; the second expansion cylinder magnetic pole interacts with the first expansion cylinder magnetic pole, so that the function of extending an expansion piston (a built-in heat regenerator) is realized; the expansion piston reset spring realizes the function of resetting the expansion piston (the built-in heat regenerator);
the split pipe is used for separating the expansion cylinder from the compression cylinder, so that the refrigerating part of the expansion cylinder is far away from the heating part of the compression cylinder, and the influence of the heating part on the refrigerating part is reduced; the split pipe provides a channel for circulating working medium to flow between the expansion cavity and the compression cavity;
helium is adopted as the circulating working medium, the molecular weight of the circulating working medium is small, and the performance of the circulating working medium is close to the property of ideal gas as actual gas; the circulating working medium flow path comprises: compression cavity-compression cylinder air hole-split pipe-expansion cylinder air hole-environment temperature cavity-expansion piston (built-in heat regenerator) -expansion cavity-expansion piston (built-in heat regenerator) -environment temperature cavity-expansion cylinder air hole-split pipe-compression cylinder air hole-compression cavity;
the circuit system comprises various electronic elements or sensing elements so as to realize functions of acquisition, processing, storage, transmission and the like of drilling data; the circuit system is fixed at the end part of the expansion cavity through thermal design, and when the cooling system works, the heat on the circuit system is absorbed.
The working principle of the present embodiment is specifically described below.
In the drilling process, the drilling fluid enters the eccentric water hole 1 with the cooling system through the water hole of the last drill rod, and when the drilling fluid flowing at high speed flows through the fixed turbine 5, the flow direction of the drilling fluid is changed due to a certain included angle between the upper blades of the fixed turbine and the flow direction of the drilling fluid; the drilling fluid with changed flow direction washes the blades on the movable turbine 7 with a certain included angle with the flow direction, so that the movable turbine 7 can start to rotate by hydraulic power, and the rotating shaft 10 fixed on the movable turbine 7 also rotates together; the rotary shaft 10 is fixed with a first expansion cylinder magnetic pole 9 and a first compression cylinder magnetic pole 11, which interact with a second expansion cylinder magnetic pole 28 and a second compression cylinder magnetic pole 21 respectively, so that an expansion piston (a built-in regenerator) 25 and a compression piston 23 sequentially extend, and then sequentially return under the action of an expansion piston return spring 29 and a compression piston return spring 22; the interval between the sequential extension and the resetting is determined by the phase angle of the expansion cavity leading the compression cavity; each time the rotation shaft 10 rotates, the expansion piston 25 and the compression piston 23 are respectively extended and reset once; due to the continuous circulation of the drilling fluid, the rotary shaft 10 is always in a rotary state, and the expansion piston 25 and the compression piston 23 periodically perform reciprocating linear motions of extension and reset; meanwhile, the expansion piston (built-in regenerator) 25 and the compression piston 23 are designed according to the reverse Stirling cycle, and the motion law is shown by a pressure-capacity diagram of the reverse Stirling cycle in FIG. 8 and a temperature-entropy diagram of the reverse Stirling cycle in FIG. 9, so that thermodynamic refrigeration cycle processes of isothermal compression (S1-S2), isothermal heat release (S2-S3), isothermal expansion (S3-S4) and isothermal heat absorption (S4-S1) are sequentially completed.
During isothermal compression (S1-S2), the stroke of the compression piston 23 is gradually increased from 0, while the expansion piston (built-in regenerator) 25 is kept stationary, so that the working fluid gas is isothermally compressed; the designed isothermal process is realized by absorbing heat generated by compression through the drill collar body 4 connected with the compression cylinder 13 through the cylinder wall, and then carrying away the heat by heat exchange between the drilling fluid flowing at high speed and the drill collar body 4; in the process, the temperature of the point 1 is equal to the temperature of the point 2, the pressure of the point 1 is smaller than the pressure of the point 2, and the volume of the point 1 is larger than the volume of the point 2;
in the process of isovolumetric heat release (S2-S3), the compression piston 23 and the expansion piston (built-in heat regenerator) 25 move together, the stroke of the compression piston 23 is gradually maximized, the stroke of the expansion piston (built-in heat regenerator) 25 is gradually increased from 0, and the working medium gas sequentially passes through the separating tube 14, the ambient temperature cavity 26 and the expansion piston (built-in heat regenerator) 25 from the compression cavity 19 and enters the expansion cavity 30, and in the process, the total volume of the working medium gas is kept unchanged but passes through the expansion piston
When the regenerator 25 is built in, the heat of the working medium gas is absorbed by the regenerator packing, so that the pressure and the temperature of the working medium gas entering the expansion cavity 30 are reduced; the process belongs to an internal heat exchange process and is irrelevant to the energy consumption of the whole cycle; in this process, the temperature at point 2 is greater than the temperature at point 3, the pressure at point 2 is greater than the pressure at point 3, and the volume at point 2 is equal to the volume at point 3;
in the isothermal expansion (S3-S4) process, the compression piston 23 is kept stationary at the maximum stroke, the stroke of the expansion piston (the built-in regenerator) 25 gradually reaches the maximum, and the working medium gas expands in the expansion cavity 30, so that the volume of the working medium gas increases, the pressure drops, the temperature of the working medium gas is lower than the ambient temperature, and heat is absorbed from the circuit system contacted with the working medium gas to maintain isothermal expansion; in this process, the temperature at 3 points is equal to the temperature at 4 points, the pressure at 3 points is higher than the pressure at 4 points, and the volume at 3 points is smaller than the volume at 4 points;
in the process of isovolumetric heat absorption (S4-S1), the compression piston 23 and the expansion piston (built-in heat regenerator) 25 move together and return to 0 position from the maximum stroke, and the working medium gas sequentially passes through the expansion piston (built-in heat regenerator) 25, the ambient temperature cavity 26 and the split pipe 14 from the expansion cavity 30 and enters the compression cavity 19, and the total volume of the working medium gas is kept unchanged in the process, but when the working medium gas passes through the expansion piston (built-in heat regenerator) 25, the low-temperature working medium gas absorbs the heat of the heat regenerator filler, so that the pressure and the temperature of the working medium gas entering the compression cavity 19 are increased; the process also belongs to an internal heat exchange process and is irrelevant to the energy consumption of the whole cycle; in this process, the temperature at point 4 is lower than the temperature at point 1, the pressure at point 4 is lower than the pressure at point 1, and the volume at point 4 is equal to the volume at point 1;
the circuit system 16 is fixed at the end of the expansion chamber 30 through thermal design, and through the four refrigeration cycle processes, the expansion chamber 30 continuously absorbs heat of the circuit system 16, so that the circuit system 16 is prevented from shortening the service life or losing efficacy.
The invention uses the piston to apply expansion action to the circulating working medium in the cylinder, so that the volume of the circulating working medium is increased, the pressure is reduced, the temperature is reduced, the circulating working medium has heat absorption capacity, and the temperature of a downhole circuit connected with the circulating working medium is reduced. The expansion cylinder and the compression cylinder are designed according to the reverse Stirling cycle principle, and the combined action of the turbine rotating device and the magnetic pole driving device is utilized to realize four refrigeration cycle processes of isothermal compression, isovolumetric heat release, isothermal expansion and isovolumetric heat absorption of a circulating working medium, so that the heat on a circuit system is absorbed by an expansion cavity, the heat is transferred into a compression cavity, and the heat is further released into the environment, thereby reducing the temperature of the circuit system, and avoiding the phenomena of shortening the service life or losing efficacy.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (10)
1. A pole drive cooling system for while drilling instrument circuitry, comprising:
the turbine rotating device is arranged in an eccentric water hole (1) of the drill collar body (4) and is connected with a rotating shaft (10), a first expansion cylinder magnetic pole (9) and a first compression cylinder magnetic pole (11) are arranged on the rotating shaft (10) in a staggered mode along the axial direction, and the projection of the first expansion cylinder magnetic pole (9) and the first compression cylinder magnetic pole (11) on a horizontal plane forms an included angle which is different from zero;
an expansion cylinder (17) which is divided into an expansion chamber (30) and an ambient temperature chamber (26) by an expansion piston (25) with a second expansion cylinder pole (28), the expansion piston (25) being driven to reciprocate by the first expansion cylinder pole (9) via the second expansion cylinder pole (28);
a compression cylinder (13) in which a compression piston (23) with a second compression cylinder pole (21) and a compression chamber (19) communicating with the ambient temperature chamber (26) are arranged; the compression piston (23) is driven to reciprocate by the first compression cylinder magnetic pole (11) through the second compression cylinder magnetic pole (21);
circuitry (16) is thermally secured to the end of the expansion chamber (30).
2. A pole drive cooling system for while drilling instrument circuitry as recited in claim 1, wherein the turbine rotating means comprises:
the fixed turbine (5) is arranged in the water hole through a fixing device, and the blade of the fixed turbine and the axial direction of the drill collar form an included angle which is not zero;
the movable turbine (7) is arranged in the water hole through the rolling support device, and an inclination angle exists between the blades of the movable turbine and the blades of the fixed turbine (5); the moving turbine (7) is connected with the rotating shaft (10).
3. A pole drive cooling system for while drilling instrument circuitry according to claim 1, characterized in that the phase angle of the first expansion cylinder pole (9) leads the phase angle of the first compression cylinder pole (11) in the direction of rotation of the rotation shaft (10).
4. A pole drive cooling system for a while drilling instrument circuit according to claim 1, characterized in that a regenerator is provided in the expansion piston (25).
5. A magnetic pole driving cooling system for a while-drilling instrument circuit system according to claim 1, wherein the second expansion cylinder magnetic pole (28) is of a circular ring structure, and working medium in the expansion cavity (30) and the ambient temperature cavity (26) enter and exit a regenerator arranged in the expansion piston through the center of the circular ring structure.
6. A magnetic pole drive cooling system for a while-drilling instrument circuit system according to claim 1, characterized in that a separate pipe is arranged in the drill collar body (4), the separate pipe being used for separating the expansion cylinder (17) from the compression cylinder (13).
7. A pole drive cooling method for a while-drilling instrument circuit system, comprising:
a turbine rotating device arranged in an eccentric water hole (1) of the drill collar body (4) rotates to drive a rotating shaft (10) provided with a first expansion cylinder magnetic pole (9) and a first compression cylinder magnetic pole (11) to rotate;
a first expansion cylinder magnetic pole (9) acts on a second expansion cylinder magnetic pole (28) in the expansion cylinder (17) to drive an expansion piston (25) arranged in the expansion cylinder (17) to reciprocate;
a first compression cylinder magnetic pole (11) acts on a second compression cylinder magnetic pole (21) in the compression cylinder (13) to drive a compression piston (23) arranged in the compression cylinder (13) to reciprocate;
wherein the expansion cylinder (17) and the compression cylinder (13) are in communication; circuitry (16) is thermally fixed to the end of the expansion chamber (30) of the expansion cylinder (17).
8. A pole drive cooling method for while drilling instrument circuitry as recited in claim 7, comprising one or more of the following steps:
an isothermal compression step in which the expansion piston (25) remains stationary, the stroke of the compression piston (23) gradually increasing from zero to isothermally compress the working fluid gas;
an isovolumetric heat release step, wherein the stroke of an expansion piston is gradually increased from zero, the stroke of a compression piston synchronously reaches the maximum gradually from non-zero, and working medium gas enters an ambient temperature cavity in the expansion cylinder from a compression cavity of the compression cylinder and then enters the expansion cavity through the expansion piston; when passing through the expansion piston, the circulating working medium releases heat to a heat regenerator arranged in the expansion piston;
isothermal expansion, namely keeping the compression piston at the maximum stroke, and gradually enabling the stroke of the expansion piston to reach the maximum from non-zero so as to expand working medium gas in an expansion cavity;
and in the isovolumetric heat absorption step, the compression piston and the expansion piston are reset to zero position together from the maximum stroke, working medium gas enters the environment cavity from the expansion cavity through the expansion piston and finally enters the compression cavity, and when the working medium passes through the expansion piston, the circulating working medium absorbs heat from a heat regenerator arranged in the expansion piston.
9. A pole drive cooling method for a while drilling instrument circuit according to claim 7, characterized in that a regenerator is provided in the expansion piston (25).
10. The magnetic pole driving cooling method for the while-drilling instrument circuit system according to claim 7, wherein a separate pipe is arranged in the drill collar body (4) and used for separating the expansion cylinder (17) from the compression cylinder (13).
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| CN201911069922.7A CN111212548B (en) | 2019-11-05 | 2019-11-05 | Magnetic pole driving cooling system and method for while-drilling instrument circuit system |
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| CN201911069922.7A CN111212548B (en) | 2019-11-05 | 2019-11-05 | Magnetic pole driving cooling system and method for while-drilling instrument circuit system |
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| CN111212548B true CN111212548B (en) | 2023-08-04 |
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