Oil and gas replacement device and method for CO2 and shale oil reservoir

Abstract

The invention discloses an oil and gas replacement device for CO2 and shale oil reservoirs, which comprises a casing pipe, a gas inlet pipe and a gas outlet pipe, the casing pipe penetrates through a borehole and is arranged in a horizontal well, and the outer wall of the casing pipe is attached to the inner wall of the horizontal well; the oil pipe is arranged in the center of the interior of the casing pipe and penetrates through the casing pipe to go deep into the horizontal well; the connecting shell is arranged in the horizontal well and is fixed at the extraction end of the oil pipe; the extraction device is fixed in the connecting shell and is fixedly connected with the oil pipe; the conveying device is fixed in the center of the extraction device; the adjusting telescopic shaft is of a multi-section structure and is movably arranged in the center of the conveying device, and one end of the outermost shaft body is fixedly connected with the center of the oil pipe; and the multiple separation devices are linearly distributed and correspond to all the sections of the adjusting telescopic shaft. Compared with the prior art, the method has the advantages that the oil reservoir is divided into multiple sections, CO2 is injected in sections, the displacement process can be more effectively controlled, invalid diffusion of CO2 is reduced, and the oil displacement efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil reservoir development, and more specifically to a device and method for replacing oil and gas between CO2 and shale oil reservoirs. Background Art

[0002] In the field of oil reservoir development, water injection is a common method for improving the recovery of conventional oil reservoirs. However, after water injection development, there is often still a part of crude oil in the pores of the formation that cannot be effectively recovered, and this part of crude oil is called residual oil. For this part of residual oil, gas drive has become a commonly used tertiary oil recovery method, and its mechanism is to inject gas into the formation to displace the crude oil remaining in the reservoir after water drive. In the gas drive method, CO2 is widely used due to its unique physical and chemical properties. CO2 oil recovery has achieved remarkable results in improving the recovery rate, especially in the development of low-permeability oil reservoirs and small fault block oil reservoirs. CO2 is fully dissolved in crude oil, which can reduce the viscosity of crude oil and reduce the surface tension, thereby improving the oil recovery efficiency. At present, CO2 oil recovery work is uniformly carried out in horizontal wells. For horizontal wells that have been fractured, it is difficult to effectively control the displacement process, and it is easy to cause ineffective diffusion of CO2 in the early stage, and the oil recovery efficiency is low. Therefore, it is necessary to provide a CO2 and shale oil reservoir oil and gas replacement device and method to solve the problems raised in the above background technology. Summary of the invention

[0003] To achieve the above object, the present invention provides the following technical solution: a CO2 and shale oil reservoir oil and gas replacement device and method, comprising:

[0004] A casing is disposed in the horizontal well through the wellbore, and the outer wall of the casing is in contact with the inner wall of the horizontal well;

[0005] The oil pipe is arranged at the inner center of the casing and penetrates through the casing into the horizontal well;

[0006] A connecting shell is arranged in a horizontal well and fixed to the extraction end of the oil pipe;

[0007] The extraction device is fixed inside the connecting shell and is fixedly connected to the oil pipe;

[0008] A conveying device, fixed at the center of the extraction device;

[0009] The adjustable telescopic shaft is a multi-section structure, which is movably arranged at the center of the conveying device, and one end of the outermost shaft body is fixedly connected to the center of the oil pipe;

[0010] A plurality of partition devices are linearly distributed and correspond to each section of the adjustable telescopic shaft.

[0011] Further, as a preference, the extraction device comprises:

[0012] The pipe body is fixed inside the connecting shell and one end of the pipe is fixedly connected to the oil pipe;

[0013] A plurality of extraction units are provided in an annular distribution and fixed around the pipe body;

[0014] The extraction pipe is slidably arranged on the extraction unit and corresponds to the partition device.

[0015] That is to say, driven by the extraction unit, the extraction pipe slides back and forth in the extraction unit. When the conveying device moves each partition device into the horizontal well by adjusting the telescopic shaft, the extraction unit drives the extraction pipe to slide inward, so that the pipe mouth of the extraction pipe corresponds to the plane of the remaining partition device, and the displaced crude oil in the segment is efficiently extracted; when each segment is displaced and extracted in turn, the conveying device retracts the partition device at the segment where the displacement is completed by adjusting the telescopic shaft, and the extraction unit drives the extraction pipe to slide outward, supports the partition device through the extraction pipe, and facilitates the extraction pipe to extract the crude oil in the next segment.

[0016] Further, preferably, the extraction unit comprises:

[0017] A regulating component is fixed on the outside of the tube body;

[0018] A slideway is arranged in the regulating component, and the extraction pipe is slidably arranged in the slideway;

[0019] The conveying pipe is arranged in the regulating assembly, is in the same straight line as the slideway, and is slidably connected with the extraction pipe;

[0020] The connecting pipe connects the conveying pipe and the side wall of the pipe body.

[0021] That is to say, under the displacement of CO2, crude oil is produced from adjacent fractures to between the two separation devices. Under the action of the regulating component, the extraction pipe is driven to slide in the slideway, so that the pipe mouth of the extraction pipe is connected to the inner plane of the separation device. Under the action of the extraction pipe, crude oil is extracted into the transmission pipe through the extraction pipe, and then transported into the pipe body by the connecting pipe, and then transported to the ground through the pipe body by the oil pipeline.

[0022] Further, as a preference, the conveying device comprises:

[0023] A fixed frame is fixed at the center of the extraction device, and one end of the frame is fixedly connected to the pipe body;

[0024] The adjusting conveying assembly is provided with a plurality of components distributed in an annular manner and fixed on the inner side of the fixed frame;

[0025] The clamping conveying member is connected to the adjusting conveying assembly and fits with the outer wall of the adjusting telescopic shaft;

[0026] The driving mechanism is arranged inside the fixed frame and connected with the clamping conveying member.

[0027] That is to say, under the control of the adjusting and conveying assembly, the clamping and conveying parts are fitted with the innermost shaft body of the adjusting and telescopic shaft. Driven by the driving mechanism, the clamping and conveying parts pull out the inner shaft body of the adjusting and telescopic shaft. At the junction of the two shaft bodies of the adjusting and telescopic shaft, the adjusting and conveying assembly controls the switching to keep the shaft bodies in the adjusting and telescopic shaft being conveyed in sequence, and each shaft body drives the corresponding separation device to detach from the extraction pipe and move toward the inside of the horizontal well, thereby dividing the horizontal well into sections to facilitate the segmented displacement work.

[0028] Further, as a preference, the regulating and conveying assembly comprises:

[0029] A moving part is slidably arranged on the fixed frame;

[0030] A hydraulic cylinder is fixed inside the fixed frame, and the extension shaft of the hydraulic cylinder is fixedly connected to the moving part;

[0031] Two telescopic connecting rods are symmetrically arranged, and the two ends of the telescopic connecting rods are rotatably connected to the moving part and the clamping conveying part respectively;

[0032] The fixed connecting rods are symmetrically distributed in two groups, each group is linearly distributed with two, each group of the fixed connecting rods corresponds to the telescopic connecting rods, and the two ends of the fixed connecting rods are respectively rotatably connected to the fixed frame and the clamping conveyor.

[0033] That is to say, when the extension shaft of the hydraulic cylinder is extended, the moving part is driven to slide on the fixed frame, and then the clamping and conveying part is driven to move toward the outer wall of the adjustable telescopic shaft through the telescopic connecting rod. At the same time, under the restriction of the fixed connecting rod, the clamping and conveying part is fitted to the outer wall of the adjustable telescopic shaft; when the clamping and conveying part conveys the shaft body of the adjustable telescopic shaft, at the intersection of the two sections of the shaft body, under the action of the fixed connecting rod and the telescopic connecting rod, the shaft body located on the outside will lift the end of the clamping and conveying part, so that the clamping and conveying part is in an inclined state, and the shaft body is continuously conveyed. After switching to the next shaft body, the clamping and conveying part is reset, and under the action of the telescopic connecting rod, the clamping and conveying part is fitted to the conveyed shaft body, so as to maintain the continuous conveyance of each section of the shaft body on the adjustable telescopic shaft. On the contrary, when recovering, the clamping and conveying part only needs to keep in contact with the shaft body on the adjustable telescopic shaft, and the adjustable telescopic shaft is driven to actively shrink and recover through the movement of the oil pipe.

[0034] Further, as a preference, the separation device comprises:

[0035] The isolation annulus is stuck in the horizontal well, and the outer ring of the isolation annulus is in contact with the inner wall of the horizontal well;

[0036] A protective shell is fixed at the center of the sealing annulus, the center of the protective shell is rotatably connected to the adjusting telescopic shaft, and a central clamping block corresponding to the adjusting telescopic shaft is provided at the center of the protective shell, and a plurality of through holes corresponding to the extraction pipes are provided on the annulus;

[0037] The control assembly is fixed inside the protective housing on a side away from the conveying device;

[0038] A fixed component is arranged inside the protective housing and is slidably arranged in the middle of the control component;

[0039] The closing component is arranged inside the protective shell, slidably arranged on the control component, and located outside the fixed component.

[0040] That is to say, under the action of the isolation annulus, the separation device is stuck in the horizontal well, the horizontal well channel is divided into multiple sections, and the crude oil is displaced in sections. When the shaft body of the adjustable telescopic shaft drives the separation device to break away from the extraction pipe and move into the horizontal well through the central block in the center of the protective shell, it should be noted that the central block is located on the side of the separation device close to the extraction unit. At this time, when the two connected shaft bodies in the adjustable telescopic shaft pass through the separation device, the external shaft body drives the separation device to move under the restriction of the central block, and then the control component drives the fixing component and the closing component to work. The separation device is fixed to the internal shaft body through the fixing component, and the through hole on the protective shell is closed by the closing component to ensure the airtightness between the two separation devices. It should be noted that the fixing component fixes the separation device to the internal shaft body. After the sections are displaced in sequence, the telescopic shaft can be adjusted to shrink in sequence.

[0041] Further, as a preference, the control component comprises:

[0042] A plurality of sliding rails are provided in an annular distribution and fixed on a side of the protective housing away from the conveying device;

[0043] A rotating circular surface is arranged at the inner center of the protective shell, and the center of the rotating circular surface is rotatably connected to the adjusting telescopic shaft, and a plurality of first arc-shaped slideways distributed in an annular manner are arranged on the rotating circular surface, and the first arc-shaped slideways correspond to the sliding track;

[0044] A rotating ring is arranged inside the protective shell, the rotating ring is located outside the rotating circular surface and inside the plurality of through holes, and a second arc-shaped slideway corresponding to the sliding track is provided on the rotating ring;

[0045] The driving gear is arranged between the rotating circular surface and the rotating circular ring, is connected with the rotating circular surface and the rotating circular ring respectively, and is driven by a driving motor arranged inside the protective shell.

[0046] That is to say, driven by the driving motor, the driving gear rotates, thereby driving the rotating circular surface and the rotating ring to rotate in opposite directions. When the driving gear rotates clockwise, the rotating circular surface rotates counterclockwise, and the rotating ring rotates clockwise; conversely, when the driving gear rotates counterclockwise, the rotating circular surface rotates clockwise, and the rotating ring rotates counterclockwise.

[0047] Further, as a preference, the fixing assembly comprises:

[0048] An inner sliding block is slidably arranged on the sliding track and the first arc-shaped sliding track;

[0049] A plurality of clamping and fixing blocks are provided in an annular distribution and are arranged on the outside of the adjusting and telescopic shaft, and the clamping and fixing blocks are fixedly connected to the corresponding inner sliding blocks.

[0050] That is to say, when the driving gear rotates clockwise, the rotating circular surface rotates counterclockwise, driving the inner slider to slide toward the center on the sliding track through the first arc-shaped slideway, driving the clamping and fixing block to clamp and fix the shaft body of the adjustable telescopic shaft; conversely, when the driving gear rotates counterclockwise, the rotating circular surface rotates clockwise, driving the inner slider to slide outward on the sliding track through the first arc-shaped slideway, driving the clamping and fixing block to move away from the shaft body of the adjustable telescopic shaft.

[0051] Further, as a preference, the closure assembly comprises:

[0052] An outer sliding block is slidably arranged on the sliding track and the second arc-shaped sliding track;

[0053] A plurality of closed arc surfaces are provided in an annular distribution and are slidably connected to the rotating ring, and the closed arc surfaces are fixedly connected to the corresponding outer sliding blocks.

[0054] That is to say, when the driving gear rotates clockwise, the rotating ring rotates clockwise, driving the outer slider to slide outward on the sliding track through the second arc slide, driving the closed arc surface to close the through hole on the protective shell; conversely, when the driving gear rotates counterclockwise, the rotating ring rotates counterclockwise, driving the outer slider to slide toward the center on the sliding track through the second arc slide, driving the closed arc surface to open the through hole on the protective shell.

[0055] A method for using a CO2 and shale oil reservoir oil and gas replacement device comprises the following steps:

[0056] Step 1: First, perform staged fracturing in the horizontal well, then convey the casing into the horizontal well through the wellbore, so that the outer wall of the casing fits the inside of the horizontal well, and then the oil pipe drives the connecting shell, the extraction device, the conveying device, the adjustable telescopic shaft and the separator to pass through the casing and enter the horizontal well;

[0057] Step 2: Then, the conveying device is used to drive the adjustable telescopic shaft to extend in sequence, and then the shaft body of the adjustable telescopic shaft drives the separation device to move into the interior of the horizontal well in sequence, and the driving gear in the control component rotates clockwise, driving the rotating circular surface to rotate counterclockwise, and the rotating ring rotates clockwise, and the inner slider is driven to slide toward the center on the sliding track through the first arc slide, and the clamping and fixing block is driven to clamp and fix the shaft body of the adjustable telescopic shaft, and the outer slider is driven to slide outward on the sliding track through the second arc slide, and the closed arc surface is driven to close the through hole on the protective shell, and the horizontal well is divided into multiple sections through multiple separation devices;

[0058] Step 3: Then, high-pressure CO2 is injected along the annular space between the oil pipe and the casing. The high-pressure CO2 enters the cracks between the casing and the separator to displace the crude oil. The crude oil is produced from the adjacent cracks. The crude oil is extracted through the extraction pipe of the extraction device, transported to the pipe body through the extraction unit, and produced to the ground through the oil pipe;

[0059] Step 4: When the oil production of the segment does not reach the economic output, the CO2 displacement production operation in the segmented well is stopped, and the connecting shell is driven to move into the horizontal well as a whole through the oil pipe, thereby driving the next segment of the adjustable telescopic shaft to shrink. At the same time, in the corresponding separation device, the driving gear in the control component rotates counterclockwise, driving the rotating circular surface to rotate clockwise, and the rotating ring rotates counterclockwise. The inner slider is driven to slide outward on the sliding track through the first arc slide, driving the clamping fixed block away from the shaft body of the adjustable telescopic shaft, and the outer slider is driven to slide toward the center on the sliding track through the second arc slide, driving the closed arc surface to open the through hole on the protective shell, so that the extraction pipe passes through the through hole, and the crude oil of the next segment is displaced and extracted. The operation is repeated until all segments in the horizontal well are completely displaced.

[0060] Compared with the prior art, the present invention has the following beneficial effects:

[0061] In the present invention, by setting up the separator, the interior of the horizontal well after fracturing is divided into sections, and CO2 is injected in sections to effectively control the displacement process, reduce the ineffective diffusion and early breakthrough of CO2, and effectively improve the oil recovery efficiency; by setting up the conveying device and the adjusting telescopic shaft, the separator is sequentially set in the horizontal well, and when the segmented displacement is carried out, the separator is sequentially retracted; by setting up the extraction device, the crude oil displaced by CO2 is extracted. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is a schematic diagram of the overall structure of a CO2 and shale oil reservoir oil and gas replacement device;

[0063] Figure 2 It is a schematic diagram of the structure of an extraction device in a CO2 and shale oil reservoir oil and gas replacement device;

[0064] Figure 3 It is a schematic diagram of the structure of a transport device in a CO2 and shale oil reservoir oil and gas replacement device;

[0065] Figure 4 It is a schematic diagram of the structure of a regulating and conveying component in a CO2 and shale oil reservoir oil and gas replacement device;

[0066] Figure 5 This is a schematic diagram of the structure of a separator in a CO2 and shale oil reservoir oil and gas replacement device;

[0067] Figure 6 This is a schematic diagram of the internal structure of a separator in a CO2 and shale oil reservoir oil and gas replacement device;

[0068] Figure 7 A schematic diagram of the connection between a separator and an extraction device in a CO2 and oil and gas replacement device in a shale oil reservoir;

[0069] In the figure: 1, casing; 2, oil pipe; 3, connecting shell; 4, extraction device; 5, conveying device; 6, adjusting telescopic shaft; 7, separation device; 41, pipe body; 42, extraction unit; 43, extraction pipe; 51, fixed frame; 52, adjusting conveying assembly; 53, clamping conveying member; 54, driving mechanism; 71, sealing ring; 72, protective shell; 73, control assembly; 74, fixing assembly; 75, closing assembly; 421, regulating assembly; 422, slideway; 4 23. Delivery pipe; 424. Connecting pipe; 521. Moving part; 522. Hydraulic cylinder; 523. Telescopic connecting rod; 524. Fixed connecting rod; 721. Center block; 722. Through hole; 731. Sliding track; 732. Rotating circular surface; 733. Rotating ring; 734. Driving gear; 741. Inner slider; 742. Clamping and fixing block; 751. Outer slider; 752. Closed arc surface; 7321. First arc slide; 7331. Second arc slide. DETAILED DESCRIPTION

[0070] See also Figure 1 to Figure 7 In an embodiment of the present invention, a CO2 and shale oil reservoir oil and gas replacement device and method include:

[0071] A casing 1 is passed through the wellbore and arranged in the horizontal well, and the outer wall of the casing 1 is in contact with the inner wall of the horizontal well;

[0072] The oil pipe 2 is arranged at the inner center of the casing 1 and penetrates through the casing 1 and extends into the horizontal well;

[0073] A connecting housing 3 is arranged in a horizontal well and fixed to the extraction end of the oil pipe 2;

[0074] The extraction device 4 is fixed inside the connecting shell 3 and is fixedly connected to the oil pipe 2;

[0075] The conveying device 5 is fixed at the center of the extraction device 4;

[0076] The adjustable telescopic shaft 6 is a multi-section structure, movably arranged at the center of the conveying device 5, and one end of the outermost shaft body is fixedly connected to the center of the oil pipe 2;

[0077] A plurality of partition devices 7 are linearly distributed and correspond to each section of the adjustable telescopic shaft 6 .

[0078] In this embodiment, the extraction device 4 includes:

[0079] The tube body 41 is fixed inside the connecting shell 3, and one end of the tube body 41 is fixedly connected to the oil pipe 2;

[0080] A plurality of extraction units 42 are provided in an annular arrangement and fixed around the tube body 41;

[0081] The extraction tube 43 is slidably disposed on the extraction unit 42 and corresponds to the partition device 7 .

[0082] That is to say, driven by the extraction unit 42, the extraction pipe 43 slides back and forth in the extraction unit 42. When the conveying device 5 moves each partition device 7 into the horizontal well by adjusting the telescopic shaft 6, the extraction unit 42 drives the extraction pipe 43 to slide inward, so that the pipe mouth of the extraction pipe 43 corresponds to the plane of the remaining partition device 7, and the displaced crude oil in the segment is efficiently extracted; when each segment is displaced and extracted in turn, the conveying device 5 retracts the partition device 7 at the segment where the displacement is completed by adjusting the telescopic shaft 6, and the extraction unit 42 drives the extraction pipe 43 to slide outward, supports the partition device 7 through the extraction pipe 43, and facilitates the extraction pipe 43 to extract the crude oil in the next segment.

[0083] In this embodiment, the extraction unit 42 includes:

[0084] The regulating component 421 is fixed on the outer side of the tube body 41;

[0085] A slideway 422 is disposed in the regulating component 421, and the extraction tube 43 is slidably disposed in the slideway 422;

[0086] The delivery pipe 423 is arranged in the regulating assembly 421, is in the same straight line as the slideway 422, and is slidably connected with the extraction pipe 43;

[0087] The connecting pipe 424 connects the delivery pipe 423 and the side wall of the pipe body 41 .

[0088] That is to say, under the driving effect of CO2, crude oil is produced from adjacent fractures to between the two separation devices 7. Under the action of the regulating component 421, the extraction pipe 43 is driven to slide in the slide 422, so that the pipe mouth of the extraction pipe 43 is connected to the inner plane of the separation device 7. Under the action of the extraction pipe 43, crude oil is extracted into the delivery pipe 423 through the extraction pipe 43, and then transported to the pipe body 41 by the connecting pipe 424, and then transported to the ground through the pipe body 41 by the oil pipe 2.

[0089] In this embodiment, the conveying device 5 includes:

[0090] A fixed frame 51 is fixed at the center of the extraction device 4, and one end of the fixed frame 51 is fixedly connected to the tube body 41;

[0091] A plurality of adjusting conveying components 52 are provided in an annular distribution and fixed on the inner side of the fixed frame 51;

[0092] The clamping conveying member 53 is connected to the adjusting conveying assembly 52 and fits with the outer wall of the adjusting telescopic shaft 6;

[0093] The driving mechanism 54 is disposed inside the fixed frame 51 and connected to the clamping and conveying member 53 .

[0094] That is to say, under the control of the adjusting and conveying component 52, the clamping and conveying member 53 fits with the innermost shaft body of the adjusting and telescopic shaft 6, and under the drive of the driving mechanism 54, the clamping and conveying member 53 pulls out the inner shaft body of the adjusting and telescopic shaft 6, and at the intersection of the two sections of the shaft body of the adjusting and telescopic shaft 6, the adjusting and conveying component 52 controls the switching to keep the shaft bodies in the adjusting and telescopic shaft 6 being conveyed in sequence, and each section of the shaft body drives the corresponding separating device 7 to detach from the extraction pipe 43 and move toward the inside of the horizontal well, so as to segment the horizontal well for the convenience of segmented displacement.

[0095] In this embodiment, the regulating conveying component 52 includes:

[0096] The moving member 521 is slidably disposed on the fixed frame 51;

[0097] The hydraulic cylinder 522 is fixed inside the fixed frame 51, and the extension shaft of the hydraulic cylinder 522 is fixedly connected to the moving member 521;

[0098] Two telescopic connecting rods 523 are symmetrically arranged, and the two ends of the telescopic connecting rods 523 are rotatably connected to the moving member 521 and the clamping conveying member 53 respectively;

[0099] The fixed connecting rods 524 are symmetrically arranged in two groups, each group having two fixed connecting rods 524 arranged in a straight line. Each group of the fixed connecting rods 524 corresponds to the telescopic connecting rod 523 , and the two ends of the fixed connecting rods 524 are rotatably connected to the fixed frame 51 and the clamping conveyor 53 .

[0100] That is to say, when the extension shaft of the hydraulic cylinder 522 is extended, the moving member 521 is driven to slide on the fixed frame 51, and then the clamping conveying member 53 is driven to move toward the outer wall of the adjustable telescopic shaft 6 through the telescopic connecting rod 523. At the same time, under the restriction of the fixed connecting rod 524, the clamping conveying member 53 is attached to the outer wall of the adjustable telescopic shaft 6; when the clamping conveying member 53 conveys the shaft body of the adjustable telescopic shaft 6, at the intersection of the two shaft bodies, under the action of the fixed connecting rod 524 and the telescopic connecting rod 523, the shaft body located on the outside is The end of the clamping and conveying member 53 is lifted up, so that the clamping and conveying member 53 is in an inclined state, and the shaft body is continuously conveyed. After switching to the next shaft body, the clamping and conveying member 53 is reset, and under the action of the telescopic connecting rod 523, the clamping and conveying member 53 fits the conveyed shaft body, and maintains the continuous conveyance of each section of the shaft body on the adjustable telescopic shaft 6. Conversely, when recovering, the clamping and conveying member 53 only needs to keep in contact with the shaft body on the adjustable telescopic shaft 6, and the adjustable telescopic shaft 6 is driven to actively shrink and recover through the movement of the oil pipe 2.

[0101] In this embodiment, the separation device 7 includes:

[0102] The isolation annulus 71 is stuck in the horizontal well, and the outer ring of the isolation annulus 71 is in contact with the inner wall of the horizontal well;

[0103] The protective shell 72 is fixed at the center of the sealing annulus 71. The center of the protective shell 72 is rotatably connected to the adjusting telescopic shaft 6. The center of the protective shell 72 is provided with a central block 721 corresponding to the adjusting telescopic shaft 6. The annular surface is provided with a plurality of through holes 722 corresponding to the extraction tube 43.

[0104] The control assembly 73 is fixed inside the protective housing 72 at a side away from the conveying device 5;

[0105] The fixing component 74 is arranged inside the protective housing 72 and is slidably arranged in the middle of the control component 73;

[0106] The closing component 75 is disposed inside the protective shell 72 , slidably disposed on the control component 73 , and located outside the fixing component 74 .

[0107] That is to say, under the action of the isolation annulus 71, the separator 7 is stuck in the horizontal well, the horizontal well channel is divided into multiple sections, and the crude oil is displaced in sections. When the shaft body of the adjustable telescopic shaft 6 drives the separator 7 to break away from the extraction pipe 43 and move into the horizontal well through the central block 721 in the center of the protective shell 72, it should be noted that the central block 721 is located on the side of the separator 7 close to the extraction unit 42. At this time, when the two connected shaft bodies in the adjustable telescopic shaft 6 pass through the separator 7, the external shaft body drives the separator 7 to move under the restriction of the central block 721, and then the control component 73 drives the fixing component 74 and the closing component 75 to work, and the separator 7 is fixed to the internal shaft body through the fixing component 74, and at the same time, the through hole 722 on the protective shell 72 is closed by the closing component 75 to ensure the airtightness between the two separators 7. It should be noted that the fixing component 74 fixes the separator 7 to the internal shaft body, and after the sections are displaced in sequence, the telescopic shaft 6 can be adjusted to shrink in sequence.

[0108] In this embodiment, the control component 73 includes:

[0109] A plurality of sliding rails 731 are provided in an annular arrangement and fixed to a side of the protective housing 72 away from the conveying device 5;

[0110] The rotating circular surface 732 is arranged at the inner center of the protective shell 72, and the center of the rotating circular surface 732 is rotatably connected to the adjusting telescopic shaft 6. The rotating circular surface 732 is provided with a plurality of first arc-shaped slideways 7321 distributed in an annular manner, and the first arc-shaped slideways 7321 correspond to the sliding track 731;

[0111] The rotating ring 733 is arranged inside the protective shell 72 . The rotating ring 733 is located outside the rotating circular surface 732 and inside the plurality of through holes 722 . The rotating ring 733 is provided with a second arc-shaped slideway 7331 corresponding to the sliding track 731 .

[0112] The driving gear 734 is disposed between the rotating circular surface 732 and the rotating ring 733 , is connected to the rotating circular surface 732 and the rotating ring 733 respectively, and is driven by a driving motor disposed inside the protective housing 72 .

[0113] That is to say, driven by the driving motor, the driving gear 734 rotates, thereby driving the rotating circular surface 732 and the rotating ring 733 to rotate in opposite directions. When the driving gear 734 rotates clockwise, the rotating circular surface 732 rotates counterclockwise, and the rotating ring 733 rotates clockwise; conversely, when the driving gear 734 rotates counterclockwise, the rotating circular surface 732 rotates clockwise, and the rotating ring 733 rotates counterclockwise.

[0114] In this embodiment, the fixing assembly 74 includes:

[0115] An inner slide block 741 is slidably disposed on the slide rail 731 and the first arc-shaped slideway 7321;

[0116] A plurality of clamping and fixing blocks 742 are provided in an annular distribution and are disposed on the outer side of the adjusting and telescopic shaft 6 , and the clamping and fixing blocks 742 are fixedly connected to the corresponding inner sliding blocks 741 .

[0117] That is to say, when the driving gear 734 rotates clockwise, the rotating circular surface 732 rotates counterclockwise, driving the inner sliding block 741 to slide toward the center on the sliding track 731 through the first arc slide 7321, driving the clamping and fixing block 742 to clamp and fix the shaft body of the adjusting telescopic shaft 6; conversely, when the driving gear 734 rotates counterclockwise, the rotating circular surface 732 rotates clockwise, driving the inner sliding block 741 to slide outward on the sliding track 731 through the first arc slide 7321, driving the clamping and fixing block 742 away from the shaft body of the adjusting telescopic shaft 6.

[0118] In this embodiment, the sealing component 75 includes:

[0119] An outer sliding block 751 is slidably disposed on the sliding track 731 and the second arc-shaped sliding track 7331;

[0120] A plurality of closed arc surfaces 752 are provided in an annular distribution and are slidably connected to the rotating ring 733 , and the closed arc surfaces 752 are fixedly connected to the corresponding outer sliding blocks 751 .

[0121] That is to say, when the driving gear 734 rotates clockwise, the rotating ring 733 rotates clockwise, driving the outer sliding block 751 to slide outward on the sliding track 731 through the second arc slide 7331, driving the closed arc surface 752 to close the through hole 722 on the protective shell 72; conversely, when the driving gear 734 rotates counterclockwise, the rotating ring 733 rotates counterclockwise, driving the outer sliding block 751 to slide toward the center on the sliding track 731 through the second arc slide 7331, driving the closed arc surface 752 to open the through hole 722 on the protective shell 72.

[0122] In this embodiment, a method for using a CO2 and shale oil reservoir oil and gas replacement device is characterized by comprising the following steps:

[0123] Step 1: First, perform staged fracturing in the horizontal well, then transport the casing 1 into the horizontal well through the wellbore, so that the outer wall of the casing 1 fits with the interior of the horizontal well, and then the oil pipe 2 drives the connecting shell 3, the extraction device 4, the transport device 5, the adjustable telescopic shaft 6 and the separator 7 to pass through the casing 1 and enter the horizontal well;

[0124] Step 2: Then, the conveying device 5 drives the adjusting telescopic shaft 6 to extend in sequence, and then the shaft body of the adjusting telescopic shaft 6 drives the separation device 7 to move into the horizontal well in sequence, and the driving gear 734 in the control component 73 rotates clockwise, driving the rotating circular surface 732 to rotate counterclockwise, and the rotating ring 733 rotates clockwise, and drives the inner slider 741 to slide toward the center on the sliding track 731 through the first arc slide 7321, drives the clamping and fixing block 742 to clamp and fix the shaft body of the adjusting telescopic shaft 6, drives the outer slider 751 to slide outward on the sliding track 731 through the second arc slide 7331, drives the closed arc surface 752 to close the through hole 722 on the protective shell 72, and divides the horizontal well into multiple sections through multiple separation devices 7;

[0125] Step 3: Then, high-pressure CO2 is injected along the annular space between the oil pipe 2 and the casing 1. The high-pressure CO2 enters the cracks between the casing 1 and the separator 7 to displace the crude oil. The crude oil is produced from the adjacent cracks. The crude oil is extracted through the extraction pipe 43 of the extraction device 4, and is transported to the pipe body 41 through the extraction unit 42. The crude oil is produced to the ground through the oil pipe 2;

[0126] Step 4: When the oil production of the segment does not reach the economic production, the CO2 displacement production operation in the segmented well is stopped, and the connecting shell 3 is driven to move into the horizontal well as a whole through the oil pipe 2, thereby driving the next segment of the adjusting telescopic shaft 6 to shrink. At the same time, in the corresponding separation device 7, the driving gear 734 in the control component 73 rotates counterclockwise, driving the rotating circular surface 732 to rotate clockwise, and the rotating ring 733 rotates counterclockwise, and the inner slider 741 is driven to slide outward on the sliding track 731 through the first arc slide 7321, driving the clamping fixed block 742 away from the shaft body of the adjusting telescopic shaft 6, and the outer slider 751 is driven to slide toward the center on the sliding track 731 through the second arc slide 7331, driving the closed arc surface 752 to open the through hole 722 on the protective shell 72, so that the extraction pipe 43 passes through the through hole 722, and the crude oil of the next segment is displaced and extracted, and the operation is repeated until all segments in the horizontal well are completely displaced.

[0127] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A CO2 and shale oil reservoir oil and gas replacement device, characterized in that: include: A casing (1) is passed through the wellbore and arranged in the horizontal well, and the outer wall of the casing (1) is in contact with the inner wall of the horizontal well; An oil pipe (2) is arranged at the inner center of the casing (1) and penetrates through the casing (1) into the horizontal well; A connecting shell (3) is arranged in the horizontal well and fixed to the extraction end of the oil pipe (2); The extraction device (4) is fixed inside the connecting shell (3) and is fixedly connected to the oil pipe (2); A conveying device (5) fixed at the center of the extraction device (4); The adjustable telescopic shaft (6) is a multi-section structure, movably arranged at the center of the conveying device (5), and one end of the outermost shaft body is fixedly connected to the center of the oil pipe (2); A plurality of separation devices (7) are linearly distributed and correspond to each section of the adjustable telescopic shaft (6).

2. The CO2 and shale oil reservoir oil and gas replacement device according to claim 1, characterized in that: The extraction device (4) comprises: A pipe body (41) is fixed inside the connecting housing (3), and one end of the pipe body is fixedly connected to the oil pipe (2); A plurality of extraction units (42) are provided in an annular distribution and fixed around the tube body (41); The extraction tube (43) is slidably disposed on the extraction unit (42) and corresponds to the separation device (7).

3. The CO2 and shale oil reservoir oil and gas replacement device according to claim 2 is characterized by: The extraction unit (42) comprises: A regulating component (421) is fixed on the outside of the tube body (41); A slideway (422) is arranged in the regulating component (421), and the extraction tube (43) is slidably arranged in the slideway (422); The delivery pipe (423) is arranged in the regulating component (421), is in the same straight line as the slideway (422), and is slidably connected to the extraction pipe (43); The connecting pipe (424) connects the delivery pipe (423) and the side wall of the pipe body (41).

4. The CO2 and shale oil reservoir oil and gas replacement device according to claim 3 is characterized by: The conveying device (5) comprises: A fixed frame (51) is fixed at the center of the extraction device (4), and one end of the fixed frame is fixedly connected to the tube body (41); A plurality of adjusting conveying components (52) are provided in an annular arrangement and fixed on the inner side of the fixed frame (51); A clamping conveying member (53) is connected to the adjusting conveying assembly (52) and is in contact with the outer wall of the adjusting telescopic shaft (6); The driving mechanism (54) is arranged inside the fixed frame (51) and is connected to the clamping and conveying member (53).

5. The CO2 and shale oil reservoir oil and gas replacement device according to claim 4 is characterized by: The regulating and conveying assembly (52) comprises: A moving member (521) is slidably disposed on the fixed frame (51); A hydraulic cylinder (522) is fixed inside the fixed frame (51), and an extension shaft of the hydraulic cylinder (522) is fixedly connected to the moving part (521); Two telescopic connecting rods (523) are symmetrically arranged, and two ends of the telescopic connecting rods (523) are rotatably connected to the moving member (521) and the clamping and conveying member (53) respectively; The fixed connecting rods (524) are symmetrically distributed in two groups, with each group having two fixed connecting rods (524) distributed in a straight line. Each group of the fixed connecting rods (524) corresponds to the telescopic connecting rod (523), and the two ends of the fixed connecting rods (524) are rotatably connected to the fixed frame (51) and the clamping conveying member (53), respectively.

6. The CO2 and shale oil reservoir oil and gas replacement device according to claim 5 is characterized by: The partition device (7) comprises: The sealing ring surface (71) is stuck in the horizontal well, and the outer ring of the sealing ring surface (71) is in contact with the inner wall of the horizontal well; A protective shell (72) is fixed at the center of the sealing annular surface (71), the center of the protective shell (72) is rotatably connected to the adjustable telescopic shaft (6), and a center block (721) corresponding to the adjustable telescopic shaft (6) is provided at the center of the protective shell (72), and a plurality of through holes (722) corresponding to the extraction tubes (43) are provided on the annular surface; A control assembly (73) is fixed inside the protective housing (72) on a side away from the conveying device (5); A fixed component (74) is disposed inside the protective housing (72) and is slidably disposed in the middle of the control component (73); The sealing component (75) is arranged inside the protective housing (72), is slidably arranged on the control component (73), and is located outside the fixed component (74).

7. The CO2 and shale oil reservoir oil and gas replacement device according to claim 6 is characterized by: The control component (73) comprises: A plurality of sliding rails (731) are provided in an annular arrangement and are fixed to a side of the protective housing (72) away from the conveying device (5); A rotating circular surface (732) is arranged at the inner center of the protective shell (72), and the center of the rotating circular surface (732) is rotatably connected to the adjusting telescopic shaft (6), and a plurality of first arc-shaped slideways (7321) distributed in an annular shape are provided on the rotating circular surface (732), and the first arc-shaped slideways (7321) correspond to the sliding tracks (731); A rotating ring (733) is arranged inside the protective housing (72); the rotating ring (733) is located outside the rotating circular surface (732) and inside the plurality of through holes (722); and a second arc-shaped slideway (7331) corresponding to the sliding track (731) is provided on the rotating ring (733); The driving gear (734) is arranged between the rotating circular surface (732) and the rotating circular ring (733), is connected to the rotating circular surface (732) and the rotating circular ring (733) respectively, and is driven by a driving motor arranged inside the protective housing (72).

8. The CO2 and shale oil reservoir oil and gas replacement device according to claim 7 is characterized by: The fixing assembly (74) comprises: An inner sliding block (741) is slidably disposed on the sliding track (731) and the first arc-shaped sliding track (7321); A plurality of clamping and fixing blocks (742) are provided in an annular distribution and are arranged on the outside of the adjusting telescopic shaft (6), and the clamping and fixing blocks (742) are fixedly connected to the corresponding inner sliding block (741).

9. The CO2 and shale oil reservoir oil and gas replacement device according to claim 8, characterized in that: The closure assembly (75) comprises: An outer sliding block (751) is slidably disposed on the sliding track (731) and the second arc-shaped sliding track (7331); A plurality of closed arc surfaces (752) are provided in an annular distribution and are slidably connected to the rotating ring (733), and the closed arc surfaces (752) are fixedly connected to the corresponding outer sliding blocks (751).

10. The method for using the CO2 and shale oil reservoir oil and gas replacement device according to claim 9, characterized in that: The steps include: Step 1: first, staged fracturing is performed in the horizontal well, and then the casing (1) is transported into the horizontal well through the wellbore so that the outer wall of the casing (1) fits into the interior of the horizontal well, and then the oil pipe (2) drives the connecting shell (3), the extraction device (4), the transport device (5), the adjustable telescopic shaft (6) and the separator (7) to pass through the casing (1) and enter the horizontal well; Step 2: The conveying device (5) then drives the adjusting telescopic shaft (6) to extend in sequence, thereby driving the dividing device (7) to move into the interior of the horizontal well in sequence, thereby dividing the horizontal well into multiple sections; Step 3: Then, high-pressure CO2 is injected along the annular space between the oil pipe (2) and the casing (1), and the high-pressure CO2 enters the cracks between the casing (1) and the separator (7), displacing the crude oil. The crude oil is produced from the adjacent cracks and is produced to the ground through the extraction device (4); Step 4: When the oil production of the segment does not reach the economic production, the CO2 displacement production operation in the segmented well is stopped, and the connecting shell (3) is driven to move as a whole into the horizontal well through the oil pipe (2), thereby driving the next segment of the adjustable telescopic shaft (6) to contract, so that the corresponding separation device (7) is retracted, and the next segment is displaced and pumped, and the operation is repeated until all segments in the horizontal well are completely displaced.

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