Heat insulation cabin and cooling system of petroleum drilling underground circuit

Abstract

The invention relates to a heat insulation cabin and cooling system for a petroleum drilling downhole circuit, which comprises a cylindrical inner cylinder, and a first groove for mounting the downhole circuit is formed in 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] The invention relates to the field of oil drilling, in particular to a heat insulation cabin and a cooling system for an underground circuit of an oil drilling well. Background Art

[0002] At present, the development of oil and gas resources has entered deep formations and is showing a trend of deepening, which has led to the continuous deepening of oil exploration drilling. At present, the depth of conventional drilling wells has reached about 5000m, and the ambient temperature at the bottom of the well is generally maintained between 100-175℃. The operating temperature range of existing mature downhole instruments is mostly within this range. However, as oil and gas exploration and development move to deeper layers, the number of pre-exploration wells with a depth of more than 8000m and a bottom temperature of more than 200℃ has gradually increased. Some pre-exploration wells with high scientific research value have exceeded 10,000m, and their bottom temperature can reach 230℃. If they encounter a bottom with a high low temperature gradient, their bottom temperature may exceed 250℃. In drilling projects, the use of downhole instruments is indispensable. For example, vertical drilling tools and rotary steerable drilling tools must be used to control the wellbore trajectory, and logging while drilling tools are needed to detect and record the engineering parameters and geological parameters at the bottom of the well. These downhole instruments contain a large number of chips and electronic components. The bottom hole temperature that increases with the depth of the well will cause great damage to the chips and electronic components. There may even be no downhole instruments that meet the conditions available due to the extremely high temperature.

[0003] Therefore, in the current high-temperature drilling process in deep formations, on the one hand, long-term operation at critical high temperatures will shorten the life of downhole instruments, thereby increasing the development cost of oil and gas resources; on the other hand, the extreme high-temperature environment will cause various downhole instruments to have no suitable chips and electronic components, hindering the progress of oil and gas resources into deep formations. Devices for cooling down downhole circuits have emerged. In existing devices, corresponding structures are set on the drill collar body. Such structural settings usually change the structure of the drill collar body itself, and the structure is also relatively complex. In the harsh environment downhole, the more complex the structure, the lower the reliability, which is not conducive to use. For example, the internal circuit cooling system of the drilling tool recorded in patent CN115696840A and the active cooling system recorded in CN116981229A both include complex structures composed of turbines, compressors, etc. Summary of the invention

[0004] In view of the existing deficiencies, the present invention provides a heat insulation cabin and a cooling system for an underground circuit of an oil drilling well.

[0005] The technical solution adopted by the present invention to solve its technical problems is: an insulating cabin for downhole circuits in oil drilling, comprising a cylindrical inner cylinder, a first groove for installing the downhole circuit is provided on the side wall in the middle of the inner cylinder; the inner cylinder is also provided with an installation channel adjacent to the first groove for passing the cooling pipe; a first through hole connected to the first groove is provided on the end face of the inner cylinder; a sealing sleeve on the inner cylinder is provided with a sleeve covering the first groove; both ends of the inner cylinder are provided with connecting pieces of an annular structure for connecting and fixing the inner cylinder.

[0006] Preferably, the inner cylinder is provided with a second groove around the circumference of the inner cylinder at both ends of the side wall opposite to the inner wall of the sleeve, and the two second grooves are arranged adjacent to both ends of the first groove and are both equipped with sealing rings.

[0007] Preferably, the installation channel is arranged close to the bottom of the first groove along the axis direction of the inner cylinder.

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

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

[0010] A cooling system for underground circuits in oil drilling, comprising a heat-insulating cabin as described in any of the preceding items, a liquid storage tank for storing coolant, a drive pump, a heat-conducting block and a refrigerator, wherein a cooling pipe is installed in the installation channel, one end of the cooling pipe is connected to the liquid outlet of the drive pump, and the other end is connected to the liquid inlet of the liquid storage tank; the liquid outlet of the liquid storage tank is connected to the liquid inlet of the drive pump, a section of the cooling pipe between the liquid storage tank and the heat-insulating cabin is partially penetrated in the heat-conducting block, and the refrigerator is provided with a low-temperature end, and the low-temperature end is installed on the heat-conducting block.

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

[0012] Preferably, a plurality of second through holes are arranged in parallel at intervals on the heat conductive block, 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 arranged in the middle of the heat conducting block, and the second through holes are arranged at intervals along the circumference of the heat conducting block groove.

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

[0015] The beneficial effects of the present invention are as follows: the present invention integrates the downhole circuit into the insulation cabin, and then performs heat exchange through the coolant transported by the cooling pipe installed in the installation channel of the insulation cabin, thereby achieving cooling of the downhole circuit. The cooling pipe is connected to the liquid storage tank and the drive pump to transport the coolant, and heat exchange is performed on the heat conductive block to reduce the temperature of the coolant transported to the insulation cabin. The structure is simpler and will not affect the structure of the drill collar body; and the insulation cabin can also be adapted to different downhole circuits, making it more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 2 Embodiment of the present invention Figure 1 A is a schematic diagram of the enlarged structure of the middle part;

[0018] Figure 3 2 is a schematic structural diagram of a heat insulation cabin without a sleeve and a connector according to an embodiment of the present invention;

[0019] Figure 4 is a schematic structural diagram of the front end of the heat insulation cabin according to an embodiment of the present invention;

[0020] Figure 5 is a schematic structural diagram of the rear end of the heat insulation cabin according to an embodiment of the present invention;

[0021] Figure 6 The embodiment of the present invention is Figure 5 Schematic diagram of the cross-sectional structure of AA;

[0022] Names and serial numbers of parts in the figure: 1-inner cylinder 10-first groove 11-installation channel 12-first through hole 13-second groove 14-installation hole 15-end face groove 2-cooling pipe 3-sleeve 4-connector 5-sealing ring 6-liquid storage tank 7-driving pump 8-heat conducting block 80-heat conducting block groove 81-second through hole 9-refrigeration machine 90-low temperature end. DETAILED DESCRIPTION

[0023] In order to more clearly illustrate the purpose, technical solutions and advantages of the embodiments of the present invention, the present invention will be further described in conjunction with the accompanying drawings and embodiments below for a clear and complete description. Obviously, the described embodiments are partial embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention. In addition, the directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", etc., are only referenced to the directions of the attached diagrams. The directional terms used are for better and clearer explanation and understanding of the present invention, rather than indicating or implying the orientation that the present invention must have, and therefore cannot be understood as limitations on the present invention.

[0024] Embodiments of the present invention Figures 3 to 6As shown in the figure, a heat-insulating cabin for underground circuits of oil drilling comprises a cylindrical inner cylinder 1, the inner cylinder 1 is set as a solid cylinder, and a first groove 10 for installing the underground circuit is set on the side wall of the middle part of the inner cylinder 1, such as the first groove 10 is set as a long strip groove and extends along the axis direction of the inner cylinder 1; the inner cylinder 1 is also provided with an installation channel 11 adjacent to the first groove 10 for passing a cooling pipe 2, the installation channel 11 is set close to the groove wall or groove bottom of the first groove 10, and then the cooling pipe 2 is installed in the installation channel 11, and then the flow of coolant in the cooling pipe 2 is used to reduce the temperature in the first groove 10, thereby reducing In order to control the temperature of the underground circuit, the cooling pipe 2 adopts a hollow bendable copper tube. At this time, the installation channel 11 can be arranged along the axial direction of the inner cylinder 1 close to the bottom of the first groove 10, that is, the installation channel 11 is a cylinder through hole extending from one end of the inner cylinder 1 to the other end, and the cooling pipe 2 is inserted from one end of the cylinder through hole and passes out from the other end. If two cylinder through holes are arranged at intervals, the cooling pipe 2 is inserted from the front end of one cylinder through hole and passes out from the rear end. The cooling pipe 2 is bent and inserted into the rear end of the other cylinder through hole and passes out from the front end of the cylinder through hole. In this way, the length of the cooling pipe 2 in the inner cylinder 1 is increased, and the cooling effect is improved. For example, as for the channel 11, a cavity can also be set on the inner cylinder 1 at a position adjacent to the first groove 10, and then two through holes are set on the cavity wall of the cavity, and the cooling pipe 2 can be inserted into the cavity through one through hole and then pass 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 cylinder 1, and the first through hole 12 is used to install auxiliary equipment such as auxiliary joints for downhole circuits, such as vacuum one-way valves and pins for downhole circuits. The first through holes 12 are set on both end faces of the inner cylinder 1, and one of the end faces is further provided with a mounting hole 14 in the circumferential direction of the first through hole 12, that is, the first through hole 12 is arranged on the end faces of the front end and the rear end of the inner cylinder 1. There is one, and then a mounting hole 14 is set on the end face of the front end or the rear end, and the mounting hole 14 is set as a blind hole, and the mounting hole 14 is used to assist the installation of the equipment installed in the first through hole 12 on the inner cylinder 1; an end face groove 15 is set on one end face of the inner cylinder 1, and the mounting hole 14 and the first through hole 12 on the same end face as the mounting hole 14 are set at the groove bottom of the end face groove 15, so that the equipment to be installed in the first through hole 12 can be hidden in the end face groove 15, so as to avoid the equipment protruding outside the end face of the inner cylinder 1 and being damaged during use. At this time, a sealing ring can be set on the auxiliary equipment to be installed and then installed in the end face groove 15 to achieve sealing;The sealing sleeve on the inner cylinder 1 is provided with a sleeve 3 covering the first groove 10, that is, the sleeve 3 is sealed on the inner cylinder 1 and forms a sealed cavity with the first groove 10, and the structure of the sealing sleeve of the sleeve 3 on the inner cylinder 1 can be that the inner cylinder 1 is provided with a second groove 13 around the circumference of the inner cylinder 1 at both ends of the side wall opposite to the inner wall of the sleeve 3, and the two second grooves 13 are arranged adjacent to both ends of the first groove 10 and are both installed with sealing rings 5, that is, the inner cylinder 1 is provided with second grooves 13 at the front and rear ends of the side wall, and then the sealing ring 5 is installed in the second grooves 13 so that a sealed structure is formed between the front and rear ends of the inner cylinder 1 and the front and rear ends of the sleeve 3; the inner cylinder 1 Both ends are sleeved with a connecting piece 4 of an annular structure for connecting and fixing the inner cylinder 1. The connecting piece 4 is matched and sleeved on both ends of the inner cylinder 1. Countersunk through holes or threaded through holes are set on the connecting piece 4, and corresponding threaded holes are set on the side wall of the inner cylinder. Then, the connecting piece 4 at one end is used to connect the heat insulation cabin with the battery cabin or other equipment of the downhole instrument of the drilling, or it is not connected to other equipment at this end but sleeved on the inner cylinder 1 to protect this end. The connecting piece 4 at the other end is used to connect with the cabin body composed of the liquid storage tank 6 and the driving pump 7. When connecting, the bolt can be threadedly connected to the threaded hole of the inner cylinder after passing through the countersunk hole, so that the heat insulation cabin is fixed to prevent it from sliding. ;

[0025] A cooling system for oil drilling downhole circuits, such as Figure 1 and Figure 2As shown in, it includes the heat-insulating cabin as described in any of the above items, a liquid storage tank 6 for storing coolant, a driving pump 7, a heat-conducting block 8 and a refrigerator 9. At this time, the heat-insulating cabin can be used as a cabin body, which can be called a first cabin body, the liquid storage tank 6 and the driving pump 7 are integrated in a cabin body, which is called a second cabin body, and the heat-conducting block 8 and the refrigerator 9 are integrated in a cabin body, which is called a third cabin body. The first cabin body, the second cabin body and the third cabin body are connected in sequence, and the connection between the three cabin bodies is connected by bolts. The cooling pipe 2 is arranged in the three cabin bodies. In each cabin, the three cabins are connected to form a combined cabin, and then the combined cabin is matched and installed in a pressure-bearing cylinder for bearing the downhole pressure, and finally the pressure-bearing cylinder is installed in the drill collar body; of course, the liquid storage tank 6, the drive pump 7, the heat transfer block 8 and the refrigerator 9 can also be integrated in a cabin and then connected to the insulation cabin. When the combined cabin is installed in the pressure-bearing cylinder, sealing rings are set at both ends of the combined cabin. On the one hand, the combined cabin is in a sealed state in the pressure-bearing cylinder, and on the other hand, it also has a fixing effect on the combined cabin in 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 liquid outlet of the driving pump 7, and the other end is connected to the liquid inlet of the liquid storage tank 6; the liquid outlet of the liquid storage tank 6 is connected to the liquid inlet of the driving pump 7, and the two are connected by a pipe same as the cooling pipe 2, and the section of the cooling pipe 2 between the liquid storage tank 6 and the insulation cabin is partially penetrated by the heat conduction block 8, that is to say, a heat conduction block 8 is provided on the cooling pipe 2 between the liquid storage tank 6 and the insulation cabin, and the heat conduction block 8 is made of a metal block that is convenient for heat conduction, and the driving pump 7 uses a circulating pump; the liquid storage tank 6 is a liquid storage tank with a vacuum interlayer, and its liquid inlet is arranged at the lower end of one side wall thereof, and its liquid outlet is arranged at the upper end of the other side thereof; at the same time, a hatch is provided on the top of the liquid storage tank 6, and a sealing plug is installed in the hatch to facilitate injection into the liquid storage tank 6 The cooling liquid is introduced into the cooling machine 9, thus forming a channel for the circulation of the cooling liquid; the refrigerator 9 is provided with a low-temperature end 90, and the low-temperature end 90 is installed on the heat-conducting block 8, so that the cooling liquid flowing in the cooling pipe 2 in the heat-insulating cabin installation channel 11 is heat-conducted in the heat-insulating cabin, and the temperature of the cooling liquid rises. As the cooling liquid flows, the heat is taken out of the heat-insulating cabin, and as the cooling liquid flows to the heat-conducting block 8, heat conduction is performed again at the heat-conducting block 8 to reduce the temperature of the cooling liquid, and then the cooling liquid with a lower temperature flows back to the liquid storage tank 6, and is driven by the driving pump 7 to transport the cooling liquid to the cooling pipe 2 in the heat-insulating cabin again, and the low-temperature end 90 of the refrigerator 9 generates a low temperature to reduce the temperature of the heat-conducting block 8, thereby realizing the heat conduction between the heat-conducting block 8 and the cooling liquid flowing through the cooling pipe 2 in the heat-conducting block 8.When in use, first fill the liquid storage tank 6 with coolant. At this time, no sealing plug is installed on the liquid storage tank 6. Then start the drive pump 7 to observe the gas discharge from the liquid inlet of the liquid storage tank 6. If there is no gas discharge, close the drive pump 7 and install the sealing plug on the liquid storage tank 6. Then start 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 continues to decrease, and the temperature of the heat-conducting block 8 continues to decrease. When the coolant in the cooling pipe 2 flows through the heat-conducting block 8 here, the temperature of the coolant is reduced by the low-temperature heat-conducting block 8. Then, the coolant flowing out of the heat-conducting block 8 is transported to the high-temperature insulation cabin through the liquid storage tank 6 and the drive pump 7 to reduce the temperature of the insulation cabin, thereby reducing the temperature of the downhole circuit installed in the insulation cabin.

[0026] Further improvements, such as Figure 2 As shown in , for the structure of the heat conductive block 8, a heat conductive block groove 80 is provided on the heat conductive block 8, and the low temperature end 90 is matched and installed in the heat conductive block groove 80. The heat conductive block 8 is set in a flat square shape, and a heat conductive block groove 80 is set in the middle of one side surface, and then the low temperature end 90 of the refrigerator 9 is installed in the heat conductive block groove 80. At this time, the low temperature end 90 can be set in a cylindrical structure, and its end face is set in a spherical shape. The heat conductive block groove 80 is set in a shape that matches the low temperature end 90, which is conducive to heat conduction. The setting of the cooling pipe 2 on the heat conductive block 8 is that a plurality of second through holes 81 are arranged in parallel at intervals on the heat conductive block 8, and the cooling pipe 2 passes through the plurality of second through holes 81 in sequence and is connected to the liquid storage tank 6. The cooling pipe 2 is set in a serpentine structure in the heat conductive block 8, which increases the contact area of ​​heat conduction and thus improves the heat conduction efficiency. At this time, the heat conductive block groove 80 is set in the middle of the heat conductive block 8, and the second through holes 81 are arranged at intervals along the circumference of the heat conductive block groove 80. The cooling pipe 2 can conduct heat from multiple directions of the heat conductive block groove 80, further improving the heat conduction efficiency.

[0027] Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, these modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A thermal insulation cabin for underground circuits in oil drilling, characterized in that: It includes a cylindrical inner cylinder, and a first groove for installing downhole circuits is provided on the side wall in the middle of the inner cylinder; the inner cylinder is also provided with an installation channel adjacent to the first groove for passing a cooling pipe; a first through hole connected to the first groove is provided on the end face of the inner cylinder; a sealing sleeve on the inner cylinder is provided with a sleeve covering the first groove; and both ends of the inner cylinder are provided with connecting pieces for connecting and fixing the annular structure of the inner cylinder.

2. The heat-insulating chamber for the oil drilling downhole circuit according to claim 1 is characterized in that The inner cylinder is provided with a second groove around the circumference of the inner cylinder at both ends of the side wall opposite to the inner wall of the sleeve. The two second grooves are arranged adjacent to both ends of the first groove and are both equipped with sealing rings.

3. The heat-insulating chamber for oil drilling downhole circuit according to claim 1 is characterized in that :The installation channel is arranged close to the bottom of the first groove along the axis direction of the inner cylinder.

4. The heat-insulating chamber for oil drilling downhole circuits according to claim 1 is characterized in that : Both end faces of the inner cylinder are provided with a first through hole, and one of the end faces is also provided with a mounting hole in the circumferential direction of the first through hole.

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

6. A cooling system for underground circuits in oil drilling, characterized in that : comprising a heat-insulating cabin as claimed in any one of claims 1 to 5, a liquid storage tank for storing coolant, a driving 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 liquid outlet of the driving pump, and the other end is connected to the liquid inlet of the liquid storage tank; the liquid outlet of the liquid storage tank is connected to the liquid inlet of the driving pump, a section of the cooling pipe between the liquid storage tank and the heat-insulating cabin is partially penetrated in the heat-conducting block, and the refrigerator is provided with a low-temperature end, and the low-temperature end is installed on the heat-conducting block.

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

8. The cooling system for oil drilling downhole circuit according to claim 7, characterized in that A plurality of second through holes are arranged in parallel at intervals on the heat conductive block, and the cooling pipe passes through the plurality of second through holes in sequence and is connected to the liquid storage tank.

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

10. The heat-insulating cabin for oil drilling downhole circuits according to claim 6, characterized in that :The liquid storage tank is a liquid storage tank with a vacuum interlayer.

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