CO2 and shale oil reservoir oil and gas displacement device and method

Abstract

The application discloses a CO2 and shale oil reservoir oil and gas displacement device, which comprises a sleeve, which is arranged in a horizontal well through a wellbore, and the outer wall of the sleeve is attached to the inner wall of the horizontal well; a pipe, which is arranged in the inner center of the sleeve and penetrates into the horizontal well through the sleeve; a connecting shell, which is arranged in the horizontal well and is fixed to the extraction end of the pipe; an extraction device, which is fixed to the inner part of the connecting shell and is fixedly connected with the pipe; a conveying device, which is fixed to the center of the extraction device; an adjustable telescopic shaft, which is of a multi-section structure and is movably arranged in the center of the conveying device, and the outermost shaft body is fixedly connected with the center of the pipe at one end; and a separation device, which is linearly arranged with a plurality of sections corresponding to each section of the adjustable telescopic shaft. Compared with the prior art, the reservoir is divided into multiple sections, CO2 is injected in sections, the displacement process can be more effectively controlled, the invalid diffusion of CO2 is reduced, and the oil displacement efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil reservoir development, and more particularly to a CO2 and shale oil reservoir oil and gas displacement device and method. BACKGROUND

[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, a part of the oil in the formation pores cannot be effectively produced, which is called remaining oil. For this part of the remaining oil, gas drive has become a common tertiary oil recovery method, which mechanism is to inject gas into the formation to displace the oil remaining in the reservoir after water flooding. In the gas drive method, CO2 is widely used due to its unique physical and chemical properties, and CO2 flooding has achieved remarkable results in improving recovery, especially in the development of low-permeability reservoirs and small fault block reservoirs. CO2 can fully dissolve in crude oil, reduce oil viscosity and surface tension, and thus improve oil displacement efficiency. Currently, CO2 flooding is carried out uniformly in the horizontal well, and for the fractured horizontal well, it is difficult to effectively control the displacement process, and in the early stage, it is easy to cause ineffective diffusion of CO2, resulting in low oil displacement efficiency. Therefore, it is necessary to provide a CO2 and shale oil reservoir oil and gas displacement device and method to solve the problems in the background art. SUMMARY

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

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

[0005] A tubing is arranged in the inner center of the casing and extends into the horizontal well through the casing;

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

[0007] An extraction device is fixed in the inner part of the connecting shell and fixedly connected with the tubing;

[0008] A conveying device is fixed in the center of the extraction device;

[0009] The adjusting telescopic shaft is of a multi-section structure and 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 tubing;

[0010] The partition device is linearly arranged with a plurality of partitions corresponding to each section of the adjusting telescopic shaft.

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

[0012] The pipe body is fixed in the inner part of the connecting shell and is fixedly connected with the oil pipe at one end.

[0013] The extraction units are annularly distributed 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, under the driving of the extraction unit, the extraction pipe slides in the extraction unit back and forth, when the conveying device moves the partition devices into the horizontal well through the adjusting telescopic shaft, the extraction unit drives the extraction pipe to slide inward, so that the pipe opening of the extraction pipe corresponds to the plane of the remaining partition device, and the displaced crude oil in the section is efficiently extracted; when each section is displaced and extracted in turn, the conveying device retracts the partition device at the section where displacement is completed through the adjusting telescopic shaft, the extraction unit drives the extraction pipe to slide outward, supports the partition device through the extraction pipe, and facilitates the extraction of the crude oil in the next section by the extraction pipe.

[0016] Further, as a preferred, the extraction unit comprises:

[0017] The regulating assembly is fixed on the outer side of the pipe body.

[0018] The slide is arranged in the regulating assembly, and the extraction pipe is slidably arranged in the slide.

[0019] The conveying pipe is arranged in the regulating assembly and is in the same straight line with the slide and is slidably connected with the extraction pipe.

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

[0021] That is, under the displacement of CO2, the crude oil is produced between two partition devices from adjacent cracks, under the action of the regulating assembly, the extraction pipe is driven to slide in the slide, so that the pipe opening of the extraction pipe is connected at the inner plane of the partition device, under the action of the extraction pipe, the crude oil is extracted into the conveying pipe, and then is conveyed into the pipe body through the communication pipe, and is conveyed to the ground through the pipe body and the oil pipe.

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

[0023] The fixed frame body is fixed at the center of the extraction device and is fixedly connected with the pipe body at one end.

[0024] The adjusting conveying assembly is annularly distributed and is fixed on the inner side of the fixed frame body.

[0025] The clamping conveying piece is connected with the adjusting conveying assembly and is fitted with the outer wall of the adjusting telescopic shaft.

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

[0027] That is, under the control of the adjusting conveying assembly, the clamping conveying member is in contact with the innermost shaft body of the adjusting telescopic shaft. Under the driving of the driving mechanism, the clamping conveying member pulls out the inner shaft body of the adjusting telescopic shaft. At the joint of the two shaft bodies, the adjusting conveying assembly controls the switching, keeps the shaft bodies of the adjusting telescopic shaft conveyed in sequence, and each shaft body drives the corresponding partition device to move away from the extraction pipe to the inside of the horizontal well, so as to segment the horizontal well, facilitating the segmented displacement work.

[0028] Further, preferably, the adjusting conveying assembly comprises:

[0029] A moving member is slidingly arranged on the fixed frame body;

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

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

[0032] Two groups of fixed connecting rods are symmetrically arranged, each group has two fixed connecting rods arranged in a straight line, each group of fixed connecting rods corresponds to a telescopic connecting rod, and the two ends of the fixed connecting rods are rotatably connected with the fixed frame body and the clamping conveying member, respectively.

[0033] That is, when the extension shaft of the hydraulic cylinder is extended, the moving member is driven to slide on the fixed frame body, and then the clamping conveying member is driven by the telescopic connecting rod to move towards the outer wall of the adjusting telescopic shaft, while being limited by the fixed connecting rod, the clamping conveying member is in contact with the outer wall of the adjusting telescopic shaft; when the clamping conveying member conveys the shaft body of the adjusting telescopic shaft, at the joint of the two shaft bodies, under the action of the fixed connecting rod and the telescopic connecting rod, the outer shaft body lifts the end of the clamping conveying member, so that the clamping conveying member is in an inclined state, and the shaft body is continuously conveyed, after switching to the next shaft body, the clamping conveying member is reset, and under the action of the telescopic connecting rod, the clamping conveying member is in contact with the conveyed shaft body, keeping the continuous conveying of each shaft body on the adjusting telescopic shaft, and vice versa, when recovering, the clamping conveying member only needs to keep in contact with the shaft body on the adjusting telescopic shaft, and the adjusting telescopic shaft is actively retracted through the movement of the oil pipe.

[0034] Further, preferably, the partition device comprises:

[0035] A sealing ring surface is clamped in the horizontal well, and the outer ring of the sealing ring surface is in contact with the inner wall of the horizontal well;

[0036] A protective shell is fixed in the center of the annular face, the center of the protective shell is rotationally connected with the adjusting telescopic shaft, and the center of the protective shell is provided with a center clamping block corresponding to the adjusting telescopic shaft; a plurality of through holes corresponding to the extraction pipe are arranged on the annular face;

[0037] A control assembly is fixed inside the protective shell away from the conveying device;

[0038] A fixing assembly is arranged inside the protective shell and is slidingly arranged in the middle of the control assembly;

[0039] A closing assembly is arranged inside the protective shell and is slidingly arranged on the control assembly and is located at the periphery of the fixing assembly.

[0040] That is, under the action of the annular face, the partition device is clamped in the horizontal well, the horizontal well passage is divided into multiple sections, and the crude oil is subjected to segmented displacement; when the shaft body of the adjusting telescopic shaft drives the partition device to move into the horizontal well by the center clamping block in the center of the protective shell, it is noted that the center clamping block is located on the side of the partition device close to the extraction unit; at this time, the two shaft bodies connected in the adjusting telescopic shaft pass through the partition device, the outer shaft body is limited by the center clamping block, the partition device is driven to move, and then the control assembly drives the fixing assembly and the closing assembly to work; the fixing assembly fixes the partition device on the inner shaft body, and the closing assembly closes the through holes on the protective shell to ensure the airtightness between the two partition devices; it is noted that the fixing assembly fixes the partition device on the inner shaft body, and after the segments are sequentially displaced, the adjusting telescopic shaft is sequentially contracted.

[0041] Further, as a preferred, the control assembly comprises:

[0042] A plurality of sliding rails are annularly arranged and are fixed inside the protective shell away from the conveying device;

[0043] A rotating circular face is arranged in the inner center of the protective shell, the center of the rotating circular face is rotationally connected with the adjusting telescopic shaft, a plurality of annularly arranged first arc-shaped sliding channels are arranged on the rotating circular face, and the first arc-shaped sliding channels correspond to the sliding rails;

[0044] A rotating circular ring is arranged in the protective shell, the rotating circular ring is located outside the rotating circular face and inside the plurality of through holes, and a second arc-shaped sliding channel corresponding to the sliding rails is arranged on the rotating circular ring;

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

[0046] In other words, driven by the drive motor, the drive gear rotates, which in turn causes the rotating surface and the rotating ring to rotate in opposite directions. When the drive gear rotates clockwise, the rotating surface rotates counterclockwise and the rotating ring rotates clockwise; conversely, when the drive gear rotates counterclockwise, the rotating surface rotates clockwise and the rotating ring rotates counterclockwise.

[0047] Furthermore, preferably, the fixing component includes:

[0048] The inner slider is slidably mounted on the sliding track and the first arc-shaped slide.

[0049] Multiple clamping and fixing blocks are arranged in a ring and set on the outside of the adjusting telescopic shaft, and the clamping and fixing blocks are fixedly connected to the corresponding inner sliders.

[0050] In other words, when the drive gear rotates clockwise, the rotating surface rotates counterclockwise, causing the inner slider to slide towards the center on the sliding track via the first arc-shaped slide rail, thereby causing the clamping and fixing block to clamp and fix the shaft of the adjusting telescopic shaft; conversely, when the drive gear rotates counterclockwise, the rotating surface rotates clockwise, causing the inner slider to slide outward on the sliding track via the first arc-shaped slide rail, thereby causing the clamping and fixing block to move away from the shaft of the adjusting telescopic shaft.

[0051] Furthermore, preferably, the enclosure component includes:

[0052] The outer slider is slidably mounted on the sliding track and the second arc-shaped slide.

[0053] Multiple closed arc surfaces are arranged in a ring and are slidably connected to a rotating ring. The closed arc surfaces are also fixedly connected to the corresponding outer sliders.

[0054] In other words, when the drive gear rotates clockwise, the rotating ring rotates clockwise, driving the outer slider to slide outward on the sliding track through the second arc-shaped slide, causing the closed arc surface to seal the through hole on the protective shell; conversely, when the drive gear rotates counterclockwise, the rotating ring rotates counterclockwise, driving the outer slider to slide towards the center on the sliding track through the second arc-shaped slide, causing the closed arc surface to open the through hole on the protective shell.

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

[0056] Step 1: First, perform segmented fracturing in the horizontal well. Then, transport the casing into the horizontal well through the wellbore so that the outer wall of the casing fits into the interior of the horizontal well. Next, the tubing, along with the connecting shell, extraction device, delivery device, adjusting telescopic shaft, and separation device, passes through the casing into the horizontal well.

[0057] Step two: then drive the adjusting telescopic shaft by the conveying device in turn, and then drive the separation device to move to the inside of the horizontal well in turn by the shaft body of the adjusting telescopic shaft, and drive the rotating circle to rotate counterclockwise by the driving gear in the control assembly, drive the rotating circle to rotate clockwise, drive the inner sliding block to slide to the center on the sliding rail by the first arc-shaped sliding way, drive the clamping fixed block to clamp and fix the shaft body of the adjusting telescopic shaft, drive the outer sliding block to slide outward on the sliding rail by the second arc-shaped sliding way, drive the closed arc surface to close the through hole on the protective shell, and separate the horizontal well into multiple sections by the multiple separation devices;

[0058] Step three: then inject high-pressure CO2 along the annular space between the oil pipe and the casing, the high-pressure CO2 enters the crack between the casing and the separation device, and the crude oil is displaced, the crude oil is produced from the adjacent crack, the crude oil is extracted by the extraction pipe of the extraction device, and is transported to the pipe body by the extraction unit, and the crude oil is produced to the ground through the oil pipe;

[0059] Step four: when the segmented oil production does not reach the economic yield, the CO2 displacement production operation in the segmented well is stopped, the connecting shell is driven to move into the horizontal well by the oil pipe, and the next adjusting telescopic shaft is retracted, and the corresponding separation device is driven to rotate counterclockwise by the driving gear in the control assembly, the rotating circle is driven to rotate clockwise, the rotating circle is driven to rotate counterclockwise, the inner sliding block is driven to slide outward on the sliding rail by the first arc-shaped sliding way, the clamping fixed block is driven to move away from the shaft body of the adjusting telescopic shaft, the outer sliding block is driven to slide to the center on the sliding rail by the second arc-shaped sliding way, the closed arc surface is driven to open the through hole on the protective shell, the extraction pipe passes through the through hole, and the crude oil in the next section is displaced and extracted, and the operation is repeated until the displacement of each section in the horizontal well is completed.

[0060] Compared with the prior art, the beneficial effects of the present application are:

[0061] In the present application, the inside of the fractured horizontal well is segmented by the separation device, CO2 is injected in sections, the displacement process is effectively controlled, the invalid diffusion and early breakthrough of CO2 are reduced, and the oil displacement efficiency is effectively improved; the separation device is arranged in the horizontal well in turn by the conveying device and the adjusting telescopic shaft, and the separation device is retracted in turn during the segmented displacement; the crude oil displaced by CO2 is extracted by the extraction device. BRIEF DESCRIPTION OF DRAWINGS

[0062] Figure 1 It is a whole structure schematic view of a CO2 and shale oil reservoir oil and gas displacement device;

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

[0064] Figure 3 It is a kind of CO2 and shale oil reservoir oil and gas displacement device conveying device structure schematic diagram;

[0065] Figure 4 It is a kind of CO2 and shale oil reservoir oil and gas displacement device adjusting conveying component structure schematic diagram;

[0066] Figure 5 It is a kind of CO2 and shale oil reservoir oil and gas displacement device separating device structure schematic diagram;

[0067] Figure 6 It is a kind of CO2 and shale oil reservoir oil and gas displacement device separating device internal structure schematic diagram;

[0068] Figure 7 It is a kind of CO2 and shale oil reservoir oil and gas displacement device separating device and extraction device connection schematic diagram;

[0069] In the figure: 1, casing; 2, oil pipe; 3, connecting shell; 4, extraction device; 5, conveying device; 6, adjusting telescopic shaft; 7, separating device; 41, pipe body; 42, extraction unit; 43, extraction pipe; 51, fixed frame body; 52, adjusting conveying assembly; 53, clamping conveying piece; 54, driving mechanism; 71, sealing torus; 72, protective shell; 73, control assembly; 74, fixed assembly; 75, closed assembly; 421, regulating assembly; 422, slide; 423, conveying pipe; 424, communication pipe; 521, moving piece; 522, hydraulic oil cylinder; 523, telescopic connecting rod; 524, fixed connecting rod; 721, center clamping block; 722, through hole; 731, sliding track; 732, rotating circle; 733, rotating ring; 734, driving gear; 741, inner sliding block; 742, clamping fixed block; 751, outer sliding block; 752, closed arc surface; 7321, first arc slide; 7331, second arc slide. DETAILED DESCRIPTION

[0070] Please refer to Figures 1-7 In the embodiment of the application, a CO2 and shale oil reservoir oil and gas displacement device and method, comprising:

[0071] The casing 1 is arranged in the horizontal well through the borehole, and the outer wall of the casing 1 is in close contact with the inner wall of the horizontal well.

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

[0073] The connecting shell 3 is arranged in the horizontal well and fixed at the extraction end of the oil pipe 2.

[0074] The extraction device 4 is fixed in the interior of the connecting shell 3 and is fixedly connected with the oil pipe 2;

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

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

[0077] The partition device 7 is linearly arranged with a plurality of sections corresponding to each section of the telescopic shaft 6.

[0078] In the embodiment, the extraction device 4 comprises:

[0079] The pipe body 41 is fixed in the interior of the connecting shell 3 and one end is fixedly connected with the oil pipe 2;

[0080] The extraction units 42 are annularly arranged and are fixed around the pipe body 41;

[0081] The extraction pipes 43 are slidably arranged on the extraction units 42 and correspond to the partition devices 7.

[0082] That is, the extraction pipes 43 slide in the extraction units 42 under the driving of the extraction units 42, and when the conveying device 5 moves the partition devices 7 into the horizontal well through the telescopic shaft 6, the extraction units 42 drive the extraction pipes 43 to slide inward, so that the pipe openings of the extraction pipes 43 correspond to the planes of the remaining partition devices 7, and the displaced crude oil in the section is efficiently extracted; when each section is sequentially displaced and extracted, the extraction units 42 drive the extraction pipes 43 to slide outward when the conveying device 5 withdraws the partition devices 7 at the displaced section through the telescopic shaft 6, so that the partition devices 7 are supported by the extraction pipes 43, and the extraction pipes 43 can extract the crude oil in the next section.

[0083] In the embodiment, the extraction units 42 comprise:

[0084] The control assembly 421 is fixed to the outer side of the pipe body 41;

[0085] The slide 422 is arranged in the control assembly 421, and the extraction pipe 43 is slidably arranged in the slide 422;

[0086] The conveying pipe 423 is arranged in the control assembly 421 and is in the same straight line with the slide 422 and is slidably connected with the extraction pipe 43;

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

[0088] That is to say, under the displacement of CO2, the crude oil is produced from the adjacent fractures to the two partition devices 7, under the action of the regulating assembly 421, the extraction pipe 43 is driven to slide in the slide 422, the pipe opening of the extraction pipe 43 is connected at the inner side plane of the partition device 7, under the action of the extraction pipe 43, the crude oil is extracted into the conveying pipe 423, and then is conveyed into the pipe body 41 through the communication pipe 424, and is conveyed to the ground through the oil pipe 2 through the pipe body 41.

[0089] In the embodiment, the conveying device 5 comprises:

[0090] The fixed frame body 51 is fixed at the center of the extraction device 4, and one end is fixedly connected with the pipe body 41;

[0091] The regulating conveying assembly 52 is annularly distributed and fixed at the inner side of the fixed frame body 51;

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

[0093] The driving mechanism 54 is arranged in the interior of the fixed frame body 51 and is connected with the clamping conveying piece 53.

[0094] That is to say, under the control of the regulating conveying assembly 52, the clamping conveying piece 53 is attached to the innermost shaft body of the adjusting telescopic shaft 6, under the driving of the driving mechanism 54, the clamping conveying piece 53 pulls out the inner shaft body of the adjusting telescopic shaft 6, the junction of the two shaft bodies of the adjusting telescopic shaft 6 is controlled and switched by the regulating conveying assembly 52, the shaft bodies in the adjusting telescopic shaft 6 are sequentially conveyed, and each shaft body drives the corresponding partition device 7 to move into the horizontal well from the extraction pipe 43, the horizontal well is segmented, so that the segmented displacement work is carried out.

[0095] In the embodiment, the regulating conveying assembly 52 comprises:

[0096] The moving piece 521 is slidingly arranged on the fixed frame body 51;

[0097] The hydraulic oil cylinder 522 is fixed in the interior of the fixed frame body 51, and the extending shaft of the hydraulic oil cylinder 522 is fixedly connected with the moving piece 521;

[0098] The telescopic connecting rod 523 is symmetrically arranged in two, and the two ends of the telescopic connecting rod 523 are rotatably connected with the moving piece 521 and the clamping conveying piece 53 respectively;

[0099] The fixed connecting rod 524 is symmetrically arranged in two groups, each group is linearly arranged in two, each group of the fixed connecting rod 524 corresponds to the telescopic connecting rod 523, and the two ends of the fixed connecting rod 524 are rotatably connected with the fixed frame body 51 and the clamping conveying piece 53 respectively.

[0100] That is, when the extension shaft of the hydraulic cylinder 522 extends, the moving part 521 slides on the fixed frame body 51, and then drives the clamping and conveying part 53 to move towards the outer wall of the adjusting telescopic shaft 6 through the telescopic connecting rod 523, while the clamping and conveying part 53 adheres to the outer wall of the adjusting telescopic shaft 6 under the limitation of the fixed connecting rod 524; when the clamping and conveying part 53 conveys the shaft body of the adjusting telescopic shaft 6, at the joint of the two shaft bodies, under the action of the fixed connecting rod 524 and the telescopic connecting rod 523, the shaft body on the outside lifts the end of the clamping and conveying part 53, so that the clamping and conveying part 53 is in an inclined state, and the shaft body is continuously conveyed, after switching to the next shaft body, the clamping and conveying part 53 is reset, and under the action of the telescopic connecting rod 523, the clamping and conveying part 53 adheres to the conveyed shaft body, so that the continuous conveying of each shaft body on the adjusting telescopic shaft 6 is maintained, and vice versa, when recycling, the clamping and conveying part 53 only needs to adhere to the shaft body on the adjusting telescopic shaft 6, and the adjusting telescopic shaft 6 is driven to shrink and recycle through the movement of the oil pipe 2.

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

[0102] A sealing torus 71 is clamped in the horizontal well, and the outer ring of the sealing torus 71 adheres to the inner wall of the horizontal well;

[0103] A protective shell 72 is fixed at the center of the sealing torus 71, the center of the protective shell 72 is rotationally connected with the adjusting telescopic shaft 6, and the center of the protective shell 72 is provided with a center clamping block 721 corresponding to the adjusting telescopic shaft 6, and a plurality of through holes 722 corresponding to the extraction pipe 43 are arranged on the torus;

[0104] A control assembly 73 is fixed inside the protective shell 72 away from the conveying device 5;

[0105] A fixing assembly 74 is arranged inside the protective shell 72 and is slidingly arranged at the middle part of the control assembly 73;

[0106] A sealing assembly 75 is arranged inside the protective shell 72 and is slidingly arranged on the control assembly 73 and located at the periphery of the fixing assembly 74.

[0107] That is to say, under the action of the sealing ring surface 71, the partition device 7 is clamped in the horizontal well, the horizontal well passage is divided into multiple sections, and the crude oil is subjected to segmented displacement. When the shaft body of the adjusting telescopic shaft 6 passes through the center clamping block 721 at the center of the protective shell 72 to drive the partition device 7 to move away from the extraction pipe 43 into the horizontal well, it should be noted that the center clamping block 721 is located on the side of the partition device 7 close to the extraction unit 42. At this time, the two shaft bodies connected in the adjusting telescopic shaft 6 move under the limitation of the center clamping block 721 when passing through the partition device 7, thereby driving the partition device 7 to move, and the control assembly 73 drives the fixing assembly 74 and the sealing assembly 75 to work. The partition device 7 is fixed on the inner shaft body through the fixing assembly 74, and the through hole 722 on the protective shell 72 is sealed through the sealing assembly 75, so as to ensure the airtightness between the two partition devices 7. It should be noted that the fixing assembly 74 fixes the partition device 7 on the inner shaft body, so as to facilitate the telescopic shaft 6 to shrink in sequence after the segments are sequentially displaced.

[0108] In this embodiment, the control assembly 73 comprises:

[0109] The sliding track 731 is annularly distributed and fixed on the side of the protective shell 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 rotationally connected with the adjusting telescopic shaft 6. A plurality of annularly distributed first arc-shaped sliding tracks 7321 are arranged on the rotating circular surface 732, and the first arc-shaped sliding tracks 7321 correspond to the sliding tracks 731.

[0111] The rotating circular ring 733 is arranged in the interior of the protective shell 72. The rotating circular ring 733 is located outside the rotating circular surface 732 and inside the plurality of through holes 722. A plurality of second arc-shaped sliding tracks 7331 corresponding to the sliding tracks 731 are arranged on the rotating circular ring 733.

[0112] The driving gear 734 is arranged between the rotating circular surface 732 and the rotating circular ring 733, and is connected with the rotating circular surface 732 and the rotating circular ring 733, respectively. The driving gear 734 is driven by the driving motor arranged in the interior of the protective shell 72.

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

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

[0115] The inner sliding block 741 is slidingly arranged on the sliding rail 731 and the first arc-shaped sliding channel 7321;

[0116] The clamping fixed blocks 742 are annularly distributed and arranged on the outer side of the adjusting telescopic shaft 6, and the clamping fixed blocks 742 are fixedly connected with the corresponding inner sliding blocks 741.

[0117] That is, when the driving gear 734 rotates clockwise, the rotating disc 732 rotates counterclockwise, the inner sliding block 741 is driven to slide on the sliding rail 731 towards the center through the first arc-shaped sliding channel 7321, and the clamping fixed block 742 is driven to clamp and fix the shaft body of the adjusting telescopic shaft 6; on the contrary, when the driving gear 734 rotates counterclockwise, the rotating disc 732 rotates clockwise, the inner sliding block 741 is driven to slide on the sliding rail 731 towards the outer side through the first arc-shaped sliding channel 7321, and the clamping fixed block 742 is driven to move away from the shaft body of the adjusting telescopic shaft 6.

[0118] In the embodiment, the closing assembly 75 comprises:

[0119] The outer sliding block 751 is slidingly arranged on the sliding rail 731 and the second arc-shaped sliding channel 7331;

[0120] The closing arc surfaces 752 are annularly distributed and slidingly connected with the rotating ring 733, and the closing arc surfaces 752 are fixedly connected with the corresponding outer sliding blocks 751.

[0121] That is, when the driving gear 734 rotates clockwise, the rotating ring 733 rotates clockwise, the outer sliding block 751 is driven to slide on the sliding rail 731 towards the outer side through the second arc-shaped sliding channel 7331, and the closing arc surface 752 is driven to close the through hole 722 on the protective shell 72; on the contrary, when the driving gear 734 rotates counterclockwise, the rotating ring 733 rotates counterclockwise, the outer sliding block 751 is driven to slide on the sliding rail 731 towards the center through the second arc-shaped sliding channel 7331, and the closing arc surface 752 is driven to open the through hole 722 on the protective shell 72.

[0122] In the embodiment, a use method of a CO2 and shale oil reservoir displacement device is characterized by comprising the following steps:

[0123] Step one: first, the horizontal well is subjected to staged fracturing, then the casing 1 is transported into the horizontal well through the wellbore, the outer wall of the casing 1 is fitted with the inside of the horizontal well, then the tubing 2 drives the connecting shell 3, the extraction device 4, the conveying device 5, the adjusting telescopic shaft 6 and the separation device 7 to pass through the casing 1 and enter the horizontal well;

[0124] Step two: then the adjustment telescopic shaft 6 is driven by the conveying device 5 to extend in turn, and then the shaft body of the adjustment telescopic shaft 6 drives the separation device 7 to move to the inside of the horizontal well in turn, and the driving gear 734 in the control assembly 73 is rotated clockwise, the rotating circle 732 is rotated counterclockwise, the rotating ring 733 is rotated clockwise, the inner sliding block 741 is driven to slide to the center on the sliding rail 731 through the first arc-shaped sliding way 7321, the clamping fixed block 742 is driven to clamp and fix the shaft body of the adjustment telescopic shaft 6, the outer sliding block 751 is driven to slide outward on the sliding rail 731 through the second arc-shaped sliding way 7331, the through hole 722 on the protective shell 72 is closed by the closed arc surface 752, and the horizontal well is separated into multiple sections by the multiple separation devices 7;

[0125] Step three: then the high-pressure CO2 is injected along the annular space between the oil pipe 2 and the casing 1, the high-pressure CO2 enters the crack between the casing 1 and the separation device 7, the crude oil is displaced, the crude oil is produced from the adjacent crack, the crude oil is extracted by the extraction pipe 43 of the extraction device 4, is conveyed into the pipe body 41 through the extraction unit 42, and the crude oil is produced to the ground through the oil pipe 2;

[0126] Step four: when the segmented oil production does not reach the economic yield, the CO2 displacement production operation in the segmented well is stopped, the connecting shell 3 is driven to move to the inside of the horizontal well through the oil pipe 2, the next adjustment telescopic shaft 6 is driven to shrink, and the corresponding separation device 7 is driven to move, the driving gear 734 in the control assembly 73 is rotated counterclockwise, the rotating circle 732 is rotated clockwise, the rotating ring 733 is rotated counterclockwise, the inner sliding block 741 is driven to slide outward on the sliding rail 731 through the first arc-shaped sliding way 7321, the clamping fixed block 742 is driven to move away from the shaft body of the adjustment telescopic shaft 6, the outer sliding block 751 is driven to slide to the center on the sliding rail 731 through the second arc-shaped sliding way 7331, the through hole 722 on the protective shell 72 is opened by the closed arc surface 752, the extraction pipe 43 passes through the through hole 722, and the crude oil in the next section is displaced and extracted, and the operation is repeated until the displacement of the sections in the horizontal well is completed.

[0127] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A device for displacement of oil and gas from a shale oil reservoir by CO2, characterized in that: The utility model relates to a horizontal well extraction device, including: casing (1) is set up in horizontal well through wellbore, and the outer wall of casing (1) is in line with the inner wall of horizontal well, tubing (2) is set up in the inside center of casing (1) and goes into horizontal well through casing (1), connecting shell (3) is set up in horizontal well and is fixed in the extraction end of tubing (2), extraction device (4) is fixed in the inside of connecting shell (3) and is fixedly connected with tubing (2), transport device (5) is fixed in the center of extraction device (4), adjustable telescopic shaft (6) is the multi -section structure, is movably arranged in the center of transport device (5), and the outermost shaft body one end is fixedly connected with the center of tubing (2), separation device (7) is linearly distributed and is provided with multiple, and each section of adjustable telescopic shaft (6) corresponds, the extraction device (4) includes pipe body (41), and pipe body (41) is fixed in the inside of connecting shell (3), and one end is fixedly connected with tubing (2), the transport device (5) includes: fixed frame body (51) is fixed in the center of extraction device (4), and one end is fixedly connected with pipe body (41), adjustable transport assembly (52) is annularly distributed and is provided with multiple, and is fixed in the inside of fixed frame body (51), clamping conveying piece (53) is connected with adjustable transport assembly (52), and is in line with the outer wall of adjustable telescopic shaft (6), drive mechanism (54) is set up in the inside of fixed frame body (51) and is connected with clamping conveying piece (53), the adjustable transport assembly (52) includes: moving piece (521) is slidably arranged on fixed frame body (51), hydraulic oil cylinder (522) is fixed in the inside of fixed frame body (51), and the extension shaft of hydraulic oil cylinder (522) is fixedly connected with moving piece (521), telescopic connecting rod (523) is symmetrically distributed and is provided with two, and both ends of telescopic connecting rod (523) are rotatably connected on moving piece (521) and clamping conveying piece (53) respectively, fixed connecting rod (524) is symmetrically distributed and is provided with two groups, each group is linearly distributed and is provided with two, each group fixed connecting rod (524) corresponds with telescopic connecting rod (523), and both ends of fixed connecting rod (524) are rotatably connected on fixed frame body (51) and clamping conveying piece (53) respectively, the separation device (7) includes: sealing torus (71) is clamped in horizontal well, and the outer ring of sealing torus (71) is in line with the inner wall of horizontal well, protective shell (72) is fixed in the center of sealing torus (71), the center of protective shell (72) is rotatably connected with adjustable telescopic shaft (6), and the center of protective shell (72) is provided with the center block (721) corresponding with adjustable telescopic shaft (6), and a plurality of through holes (722) corresponding with extraction pipe (43) are arranged on the torus, control assembly (73) is fixed in the inside of protective shell (72) and is away from one side of transport device (5), fixed assembly (74) is set up in the inside of protective shell (72) and is slidably arranged in the middle part of control assembly (73). The closed assembly (75) is arranged inside the protective shell (72), is arranged on the control assembly (73) in a sliding manner, and is located at the periphery of the fixed assembly (74).

2. A CO2 and shale oil reservoirs oil and gas displacement device according to claim 1, characterized by: The extraction device (4) further comprises: A plurality of extraction units (42) are annularly distributed and fixed around the pipe body (41); An extraction pipe (43) is arranged on the extraction unit (42) in a sliding manner and corresponds to the partition device (7).

3. A CO2 and shale oil reservoirs oil and gas displacement device according to claim 2, characterized by: The extraction unit (42) comprises: A regulating assembly (421) is fixed to the outer side of the pipe body (41); A sliding channel (422) is arranged in the regulating assembly (421), and the extraction pipe (43) is arranged in the sliding channel (422) in a sliding manner; A conveying pipe (423) is arranged in the regulating assembly (421) and is in the same straight line as the sliding channel (422) and is connected to the extraction pipe (43) in a sliding manner; A communication pipe (424) connects the conveying pipe (423) and the side wall of the pipe body (41).

4. The CO2 and shale oil reservoirs oil and gas displacement device according to claim 1, characterized in that: The control assembly (73) comprises: A plurality of sliding rails (731) are annularly distributed and fixed to the side of the protective shell (72) away from the conveying device (5); A rotating disc (732) is arranged at the center of the interior of the protective shell (72), the center of the rotating disc (732) is rotationally connected to the adjusting telescopic shaft (6), and a plurality of first arc-shaped sliding channels (7321) are annularly distributed on the rotating disc (732) and correspond to the sliding rails (731); A rotating ring (733) is arranged in the interior of the protective shell (72), the rotating ring (733) is located on the outer side of the rotating disc (732) and on the inner side of the plurality of through holes (722), and a plurality of second arc-shaped sliding channels (7331) corresponding to the sliding rails (731) are arranged on the rotating ring (733); A drive gear (734) is arranged between the rotating disc (732) and the rotating ring (733) and is connected to the rotating disc (732) and the rotating ring (733), and is driven by a drive motor arranged in the interior of the protective shell (72).

5. A CO2 and shale oil reservoirs oil and gas displacement device according to claim 4, characterized by: The fixed assembly (74) comprises: An inner sliding block (741) is arranged on the sliding rail (731) and the first arc-shaped sliding channel (7321) in a sliding manner; A plurality of clamping fixed blocks (742) are annularly distributed and arranged on the outer side of the adjusting telescopic shaft (6), and the clamping fixed blocks (742) are fixedly connected to the corresponding inner sliding blocks (741).

6. A CO2 and shale oil reservoirs oil and gas displacement device according to claim 5, characterized by: The closed assembly (75) comprises: An outer sliding block (751) is arranged on the sliding rail (731) and the second arc-shaped sliding channel (7331) in a sliding manner; A plurality of closed arc surfaces (752) are annularly distributed, are connected to the rotating ring (733) in a sliding manner, and are fixedly connected to the corresponding outer sliding blocks (751).

7. A method of using a CO2 and shale oil reservoirs oil and gas displacement device according to any one of claims 1-6, characterized in that: The method comprises the following steps: Step one: first, the horizontal well is fractured by stages, then the casing (1) is delivered into the horizontal well through the wellbore, the outer wall of the casing (1) is attached to the inside of the horizontal well, then the tubing (2) drives the connecting shell (3), the extraction device (4), the conveying device (5), the adjusting telescopic shaft (6) and the partition device (7) to pass through the casing (1) and enter the horizontal well; Step two: then the adjusting telescopic shaft (6) is driven by the conveying device (5) to extend in turn, and then the partition device (7) is driven to move to the inside of the horizontal well in turn, so as to divide the horizontal well into multiple sections; Step three: then high-pressure CO2 is injected along the annular space between the tubing (2) and the casing (1), the high-pressure CO2 enters the cracks between the casing (1) and the partition device (7), and the crude oil is displaced, the crude oil is produced from the adjacent cracks, and the crude oil is produced to the ground through the extraction device (4); Step four: when the segmented oil production does not reach the economic yield, the CO2 displacement production operation in the segmented well is stopped, then the connecting shell (3) is driven by the tubing (2) to move into the horizontal well in whole, and then the next adjusting telescopic shaft (6) is driven to contract, so that the corresponding partition device (7) is retracted, the next section is displaced and extracted, the operation is repeated until each section in the horizontal well is completely displaced.

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