Heat insulation cabin and cooling system of petroleum drilling underground circuit

Abstract

The utility model relates to a heat insulation cabin and cooling system of a petroleum drilling underground circuit, which comprises a cylindrical inner cylinder, and a first groove used for installing the underground circuit is arranged on the side wall of the middle part of the inner cylinder; the inner column body is further provided with an installation channel adjacent to the first groove and used for allowing a cooling pipeline to penetrate through. A first through hole communicated with the first groove is formed in the end face of the inner column body; the inner column body is sleeved with a sleeve covering the first groove in a sealed mode. The two ends of the inner column body are each sleeved with a connecting piece used for being connected with and fixing the annular structure of the inner column body. The cooling system comprises the heat insulation cabin, a liquid storage cabin used for storing cooling liquid, a driving pump, a heat conduction block and a refrigerating machine. The structure of the underground circuit cooling device can be simplified, the underground circuit cooling device is convenient to use, and the temperature of an underground circuit can be effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling, and in particular to a heat insulation chamber and cooling system for downhole circuits in oil drilling. Background Technology

[0002] Currently, oil and gas resource development has entered deep formations and is showing an increasingly deeper trend, leading to continuous deepening of oil exploration drilling. Conventional drilling depths have reached approximately 5000m, with bottomhole temperatures generally maintained between 100-175℃. Most existing mature downhole instruments operate within this temperature range. However, as oil and gas exploration and development delve deeper into the formations, the proportion of exploratory wells exceeding 8000m in depth and with bottomhole temperatures exceeding 200℃ is gradually increasing. Some exploratory wells with high scientific research value exceed 10000m, with bottomhole temperatures reaching 230℃. If encountering formations with high temperature gradients, the bottomhole temperature may exceed 250℃. In drilling engineering, the use of downhole instruments is indispensable. For example, vertical drilling tools and rotary steerable drilling tools are required to control the wellbore trajectory, and logging-while-drilling tools are required to detect and record engineering and geological parameters at the bottom of the well. These downhole instruments contain a large number of chips and electronic components. However, the bottom-hole temperature, which increases with the depth of the well, can cause great damage to the chips and electronic components. In some cases, the extremely high temperature may even render it impossible to use downhole instruments that meet the requirements.

[0003] Therefore, in the current high-temperature drilling environment of deep formations, on the one hand, prolonged operation at critical high temperatures leads to a shortened lifespan of downhole instruments, thereby increasing the development cost of oil and gas resources; on the other hand, extreme high-temperature environments result in a lack of suitable chips and electronic components for various downhole instruments, hindering the progress of oil and gas resources into deeper formations. Devices for cooling downhole circuits have emerged to address this issue. Existing devices typically incorporate structures on the drill collar body. Such structural modifications usually alter the drill collar's inherent structure, resulting in complex designs. In the harsh downhole environment, greater complexity leads to lower reliability and hinders usability. For example, the internal circuit cooling system for drilling tools described in patent CN115696840A and the active cooling system described in CN116981229A both include complex structures composed of turbines, compressors, and other components. Utility Model Content

[0004] To address the shortcomings of existing systems, this utility model provides a heat insulation chamber and cooling system for downhole circuits in oil drilling.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a heat-insulating chamber for downhole circuits in oil drilling, comprising a cylindrical inner column, wherein a first groove for installing downhole circuits is provided on the side wall of the middle part of the inner column; an installation channel for passing through cooling pipes is also provided on the inner column adjacent to the first groove; a first through hole communicating with the first groove is provided on the end face of the inner column; a sleeve covering the first groove is sealed on the inner column; and a connecting member of an annular structure for connecting and fixing the inner column is provided at both ends of the inner column.

[0006] Preferably, the inner column has a second groove around its circumference at both ends of its sidewall opposite to the inner wall of the sleeve, and the two second grooves are located adjacent to the two ends of the first groove and are each fitted with a sealing ring.

[0007] Preferably, the installation channel is located adjacent to the bottom of the first groove along the axis of the inner column.

[0008] Preferably, both end faces of the inner column are provided with a first through hole, and one end face is also provided with a mounting hole in the circumferential direction of the first through hole.

[0009] Preferably, an end face groove is provided on one end face of the inner column, and the mounting hole and the first through hole on the same end face as the mounting hole are provided at the bottom of the end face groove.

[0010] A cooling system for a downhole circuit in an oil drilling well includes an insulation chamber as described in any of the preceding claims, a storage tank for storing coolant, a drive pump, a heat-conducting block, and a chiller. A cooling pipe is installed within the installation channel, one end of which is connected to the outlet of the drive pump, and the other end is connected to the inlet of the storage tank. The outlet of the storage tank is connected to the inlet of the drive pump. A portion of the cooling pipe in the section between the storage tank and the insulation chamber passes through the heat-conducting block. The chiller has a low-temperature end, which is mounted on the heat-conducting block.

[0011] Preferably, the heat-conducting block is provided with a heat-conducting block groove, and the low-temperature end is matched and installed in the heat-conducting block groove.

[0012] Preferably, the heat-conducting block is provided with a plurality of second through holes spaced apart and arranged in parallel, and the cooling pipe passes through the plurality of second through holes in sequence and is connected to the liquid storage tank.

[0013] Preferably, the heat-conducting block groove is disposed in the middle of the heat-conducting block, and the second through holes are spaced apart circumferentially along the heat-conducting block groove.

[0014] Preferably, the liquid storage tank is a liquid storage tank with a vacuum jacket.

[0015] The beneficial effects of this utility model are as follows: This utility model integrates the downhole circuit into the heat insulation chamber, and then uses coolant transported by cooling pipes installed in the heat insulation chamber's installation channel for heat exchange, thereby achieving cooling of the downhole circuit. The cooling pipes are connected to the storage tank and drive pump to transport the coolant, and heat exchange occurs on the heat-conducting block to reduce the temperature of the coolant transported to the heat insulation chamber. The structure is simpler and will not affect the structure of the drill collar body; moreover, the heat insulation chamber can be adapted to different downhole circuits, making it more convenient to use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the cooling system according to an embodiment of the present invention;

[0017] Figure 2 This is an embodiment of the present utility model. Figure 1 A magnified structural diagram of A in the middle;

[0018] Figure 3 This is a schematic diagram of the structure of the heat insulation chamber without sleeve and connectors in an embodiment of this utility model;

[0019] Figure 4 This is a schematic diagram of the front end of the heat insulation chamber in an embodiment of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the tail end of the heat insulation chamber in an embodiment of this utility model;

[0021] Figure 6 This is an embodiment of the present utility model. Figure 5 A schematic diagram of the cross-sectional structure of AA;

[0022] Component names and serial numbers in the diagram: 1-Inner column 10-First groove 11-Mounting channel 12-First through hole 13-Second groove 14-Mounting hole 15-End face groove 2-Cooling pipe 3-Sleeve 4-Connector 5-Sealing ring 6-Liquid storage tank 7-Drive pump 8-Heat conduction block 80-Heat conduction block groove 81-Second through hole 9-Refrigeration unit 90-Low temperature end Detailed Implementation

[0023] To more clearly illustrate the purpose, technical solution, and advantages of the embodiments of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. A clear and complete description will be provided. Obviously, the described embodiments are some, but not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. Furthermore, the directional terms mentioned in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," and "outer," are only for reference to the directions in the accompanying drawings. The use of directional terms is for better and clearer explanation and understanding of this utility model, and is not intended to indicate or imply any necessary orientation of this utility model; therefore, they should not be construed as limitations on this utility model.

[0024] Examples of embodiments of this utility model Figures 3 to 6As shown, a heat insulation compartment for downhole circuits in oil drilling includes a cylindrical inner column 1. The inner column 1 is a solid cylinder. A first groove 10 for installing downhole circuits is provided on the middle side wall of the inner column 1. For example, the first groove 10 can be a long, narrow groove extending along the axis of the inner column 1. The inner column 1 also has an installation channel 11 adjacent to the first groove 10 for installing cooling pipes 2. The installation channel 11 is located close to the wall or bottom of the first groove 10. The cooling pipes 2 are then installed within the installation channel 11. The flow of coolant within the cooling pipes 2 reduces the temperature within the first groove 10, thereby lowering the temperature. For the temperature of the downhole circuit, the cooling pipe 2 is a hollow, bendable copper pipe. The installation channel 11 can be set along the axis of the inner column 1, close to the bottom of the first groove 10. That is, the installation channel 11 is a through-hole extending from one end of the inner column 1 to the other. The cooling pipe 2 is inserted from one end of the through-hole and exits from the other end. If two through-holes are spaced apart, the cooling pipe 2 is inserted from the front end of one through-hole and exits from the rear end. Then, the cooling pipe 2 is bent and inserted into the rear end of the other through-hole and exits from the front end. This increases the length of the cooling pipe 2 within the inner column 1, improving the cooling effect. For the installation channel... Alternatively, a cavity can be set on the inner column 1 adjacent to the first groove 10, and two through holes can be set on the cavity wall. The cooling pipe 2 can be inserted into the cavity through one through hole and exit through the other through hole. A first through hole 12 connected to the first groove 10 is set on the end face of the inner column 1. The first through hole 12 is used to install auxiliary equipment such as auxiliary connectors for downhole circuits, such as vacuum check valves and pins for downhole circuits. The first through hole 12 is set on both end faces of the inner column 1. A mounting hole 14 is also set on one end face in the circumferential direction of the first through hole 12. That is, the first through hole 12 is on the end face of the front and rear ends of the inner column 1. Each has one mounting hole 14, and a blind hole 14 is provided on the end face of the front or rear end. The mounting hole 14 is used to assist the installation of the equipment installed in the first through hole 12 on the inner column 1. An end face groove 15 is provided on one end face of the inner column 1. The mounting hole 14 and the first through hole 12 on the same end face as the mounting hole 14 are set at the bottom of the groove of the end face groove 15. In this way, the equipment to be installed in the first through hole 12 can be hidden in the end face groove 15, so as to prevent the equipment from protruding outside the end face of the inner column 1 and being damaged during use. At this time, a sealing ring can also be fitted on the auxiliary equipment to be installed and then installed in the end face groove 15 to achieve sealing.The inner column 1 is fitted with a sleeve 3 that covers the first groove 10. In other words, the sleeve 3 is fitted onto the inner column 1 to form a sealed cavity with the first groove 10. The sealing structure of the sleeve 3 on the inner column 1 can be such that the inner column 1 has two second grooves 13 arranged around its circumference at both ends of its sidewall opposite to the inner wall of the sleeve 3. The two second grooves 13 are located adjacent to the two ends of the first groove 10 and each is fitted with a sealing ring 5. That is, the inner column 1 has second grooves 13 at both the front and rear ends of its sidewall, and the sealing rings 5 ​​are installed in the second grooves 13 to form a sealed structure between the front and rear ends of the inner column 1 and the front and rear ends of the sleeve 3. Both ends are fitted with annular connectors 4 for connecting and fixing the inner column 1. The connectors 4 are fitted onto both ends of the inner column 1. The connectors 4 have countersunk or threaded through holes, and the inner column's sidewall has corresponding threaded holes. One end of the connector 4 is used to connect the heat insulation chamber to the battery compartment or other equipment of the drilling downhole instruments, or it can be fitted onto the inner column 1 without connecting other equipment at that end to protect it. The other end of the connector 4 is used to connect to the chamber consisting of the storage tank 6 and the drive pump 7. Connections can be made by passing bolts through the countersunk holes and then threading them into the threaded holes of the inner column, thus fixing the heat insulation chamber and preventing it from sliding.

[0025] A cooling system for downhole circuits in oil drilling, such as Figure 1 and Figure 2As shown, the system includes an insulation chamber as described in any of the preceding items, a liquid storage tank 6 for storing coolant, a drive pump 7, a heat-conducting block 8, and a refrigerator 9. In this case, the insulation chamber can be considered as one compartment, referred to as the first compartment. The liquid storage tank 6 and the drive pump 7 are integrated into one compartment, referred to as the second compartment. The heat-conducting block 8 and the refrigerator 9 are integrated into one compartment, referred to as the third compartment. The first, second, and third compartments are connected sequentially, and the connections between the three compartments are made using bolts. The cooling pipe 2 passes through the three compartments. Within each compartment, the three compartments are connected to form a combined compartment. This combined compartment is then fitted and installed in a pressure-bearing cylinder to withstand downhole pressure. Finally, the pressure-bearing cylinder is installed in the drill collar body. Alternatively, the fluid storage tank 6, drive pump 7, heat-conducting block 8, and chiller 9 can be integrated into one compartment and then connected to the insulation compartment. When the combined compartment is installed in the pressure-bearing cylinder, sealing rings are fitted at both ends of the combined compartment. This ensures that the combined compartment is sealed within the pressure-bearing cylinder and also provides fixation within the pressure-bearing cylinder. A cooling pipe 2 is installed in the installation channel 11. One end of the cooling pipe 2 is connected to the outlet of the drive pump 7, and the other end is connected to the inlet of the liquid storage tank 6. The outlet of the liquid storage tank 6 is connected to the inlet of the drive pump 7. The two are connected by the same pipe as the cooling pipe 2. A portion of the cooling pipe 2 between the liquid storage tank 6 and the heat insulation tank passes through a heat-conducting block 8. That is, a heat-conducting block 8 is installed on the cooling pipe 2 between the liquid storage tank 6 and the heat insulation tank. The heat-conducting block 8 is made of a metal block that facilitates heat conduction. The drive pump 7 is a circulating pump. The liquid storage tank 6 is a liquid storage tank with a vacuum jacket. Its inlet is located at the lower end of one side wall, and its outlet is located at the upper end of the other side. At the same time, a hatch is provided on the top of the liquid storage tank 6. A sealing plug is installed in the hatch to facilitate the injection of liquid into the liquid storage tank 6. The coolant is introduced, thus forming a channel for coolant circulation. The refrigerator 9 is equipped with a low-temperature end 90, which is installed on the heat-conducting block 8. In this way, the coolant flowing in the cooling pipe 2 in the heat insulation chamber installation channel 11 undergoes heat conduction within the heat insulation chamber, raising the coolant temperature. As the coolant flows, it carries heat out of the heat insulation chamber. As the coolant flows to the heat-conducting block 8, heat conduction occurs again at the heat-conducting block 8, lowering the coolant temperature. Subsequently, the coolant at a lower temperature flows back to the storage tank 6 and is driven by the drive pump 7 to be transported back to the cooling pipe 2 in the heat insulation chamber. The low-temperature end 90 of the refrigerator 9 generates a low temperature to lower the temperature of the heat-conducting block 8, thereby realizing heat conduction between the heat-conducting block 8 and the coolant flowing through the cooling pipe 2 within the heat-conducting block 8.In use, first fill the storage tank 6 with coolant. At this time, do not install the sealing plug on the storage tank 6. Then turn on the drive pump 7 to observe the gas discharge from the inlet of the storage tank 6. If no gas is discharged, turn off the drive pump 7 and install the sealing plug on the storage tank 6. Then turn on the refrigerator 9 and start the drive pump 7 again. The coolant circulates in the cooling pipe 2. After the refrigerator 9 is turned on, the temperature of its low-temperature end 90 continuously decreases, and the temperature of the heat-conducting block 8 continuously decreases. When the coolant in the cooling pipe 2 flows through the heat-conducting block 8, the temperature of the coolant is reduced by the low-temperature heat-conducting block 8. The coolant flowing out of the heat-conducting block 8 is then transported to the high-temperature insulation chamber through the storage tank 6 and the drive pump 7 to reduce the temperature of the insulation chamber, thereby reducing the temperature of the downhole circuit installed in the insulation chamber.

[0026] Further improvements, such as Figure 2 As shown, the structure of the heat-conducting block 8 includes a heat-conducting block groove 80. The low-temperature end 90 is fitted into the heat-conducting block groove 80. The heat-conducting block 8 is a flat, square shape with the heat-conducting block groove 80 located in the center of one side surface. The low-temperature end 90 of the refrigerator 9 is then fitted into the heat-conducting block groove 80. The low-temperature end 90 can be cylindrical with a spherical end face, and the heat-conducting block groove 80 is designed to match the shape of the low-temperature end 90, facilitating heat conduction. The cooling pipes 2 on the heat-conducting block 8 are arranged with multiple second through holes 81 spaced apart and parallel on the heat-conducting block 8. The cooling pipes 2 pass through these second through holes 81 sequentially and connect to the liquid storage tank 6. The cooling pipes 2 are arranged in a serpentine structure within the heat-conducting block 8, increasing the contact area for heat conduction and thus improving heat conduction efficiency. At this point, the heat-conducting block groove 80 is set in the middle of the heat-conducting block 8, and the second through hole 81 is set at intervals along the circumference of the heat-conducting block groove 80. The cooling pipe 2 can then conduct heat from multiple directions of the heat-conducting block groove 80, further improving the heat conduction efficiency.

[0027] Although the present invention has been described in detail above with general description and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A heat-insulated compartment for downhole circuits in oil drilling, characterized in that: The device includes a cylindrical inner column, on which a first groove for installing downhole circuitry is provided on the side wall in the middle; the inner column also has an installation channel adjacent to the first groove for passing through a cooling pipe; a first through hole communicating with the first groove is provided on the end face of the inner column; a sleeve covering the first groove is sealed on the inner column; and both ends of the inner column are fitted with connecting members of annular structures for connecting and fixing the inner column.

2. The heat-insulating chamber for the downhole circuit of an oil drilling well according to claim 1, characterized in that... The inner column has a second groove around its circumference at both ends of its side wall, opposite to the inner wall of the sleeve. The two second grooves are located adjacent to the two ends of the first groove and are each fitted with a sealing ring.

3. The heat-insulating chamber for the downhole circuit of an oil drilling well according to claim 1, characterized in that... The installation channel is located adjacent to the bottom of the first groove along the axis of the inner column.

4. The heat-insulating chamber for downhole circuits in oil drilling according to claim 1, characterized in that... The inner column has a first through hole on both end faces, and a mounting hole is also provided on one end face in the circumferential direction of the first through hole.

5. The heat-insulating chamber for the downhole circuit of an oil drilling well according to claim 4, characterized in that... An end face groove is provided on one end face of the inner column, and the mounting hole and the first through hole on the same end face as the mounting hole are provided at the bottom of the end face groove.

6. A cooling system for downhole circuits in oil drilling, characterized in that... The device includes an insulation chamber as described in any one of claims 1 to 5, a storage tank for storing coolant, a drive pump, a heat-conducting block, and a refrigerator. A cooling pipe is installed in the installation channel. One end of the cooling pipe is connected to the outlet of the drive pump, and the other end is connected to the inlet of the storage tank. The outlet of the storage tank is connected to the inlet of the drive pump. A portion of the cooling pipe in the section between the storage tank and the insulation chamber passes through the heat-conducting block. The refrigerator is provided with a low-temperature end, which is installed on the heat-conducting block.

7. The cooling system for downhole circuits in oil drilling according to claim 6, characterized in that... The heat-conducting block is provided with a heat-conducting block groove, and the low-temperature end is matched and installed in the heat-conducting block groove.

8. The cooling system for the downhole circuit of an oil drilling well according to claim 7, characterized in that... The heat-conducting block has multiple second through holes arranged in parallel at intervals, and the cooling pipe passes through the multiple second through holes in sequence and is connected to the liquid storage tank.

9. The cooling system for downhole circuits in oil drilling according to claim 8, characterized in that... The heat-conducting block groove is located in the middle of the heat-conducting block, and the second through holes are spaced apart along the circumference of the heat-conducting block groove.

10. The cooling system for the downhole circuit of an oil drilling well according to claim 6, characterized in that... The liquid storage tank is a liquid storage tank with a vacuum jacket.

Images