Gas regulating device for shale oil alternate gas injection displacement and conveying device thereof

Abstract

The invention discloses a gas adjusting device for shale oil alternate gas injection displacement and a conveying device of the gas adjusting device. The gas adjusting device for shale oil alternate gas injection displacement comprises a fixed pipe, a rotary connecting pipe and a conveying pipe. One end of the fixing pipe is covered with a sealing cover, and at least two gas conveying openings used for conveying different kinds of gas are formed in the side wall of the fixing pipe. One end of the conveying pipe is movably inserted into the rotary connecting pipe, the rotary connecting pipe is rotationally connected with the conveying pipe, and the other end of the conveying pipe is detachably connected with a mounting pipe used for conveying gas to a shale layer. An opening is formed in the peripheral side of the rotary connecting pipe, the rotary connecting pipe is movably inserted into the fixed pipe and rotationally connected with the fixed pipe, the opening is communicated with one gas conveying opening, and therefore the gas conveying openings can be conveniently switched. Carbon dioxide and nitrogen can be respectively communicated with different conveying ports, and the conveying port of the carbon dioxide and the conveying port of the nitrogen can be conveniently switched by rotating the rotary connecting pipe.

Description

Technical Field

[0001] The present application belongs to the technical field of shale oil displacement, and specifically relates to a gas regulating device and a conveying device for shale oil alternate gas injection displacement. Background Art

[0002] Shale oil is abundant in the world and has broad prospects for exploitation. However, the use of horizontal wells and a large number of hydraulic fracturing measures has greatly increased the cost of shale oil extraction.

[0003] Through a large number of experiments and data simulation results, it is known that gas injection can greatly improve the recovery rate of shale oil. Since carbon dioxide has a strong extraction ability for crude oil and a strong adsorption effect in organic matter, carbon dioxide injection technology has become one of the effective means of efficiently developing shale oil reservoirs with potential. However, due to the greenhouse effect caused by the use of carbon dioxide, the use of carbon dioxide is limited. In order to reduce the use of carbon dioxide, carbon dioxide and nitrogen displacement of shale oil has become a hot spot in the current shale oil development.

[0004] When carbon dioxide and nitrogen are used to displace shale oil alternately, the delivery amount of carbon dioxide and nitrogen needs to be controlled. Therefore, the delivery ports of carbon dioxide and nitrogen need to be switched in time according to the delivery ratio of carbon dioxide and nitrogen. In the related art, the shale oil production process is interrupted due to the difficulty in switching between the delivery ports of carbon dioxide and nitrogen, making it difficult to achieve continuous production of shale oil. Summary of the invention

[0005] In order to solve the technical problem in the related art that the shale oil production process is interrupted due to the difficulty in switching between the carbon dioxide delivery port and the nitrogen delivery port, the first aspect of the present application provides a gas conditioning device for shale oil alternate gas injection displacement, comprising:

[0006] A fixed tube, one end cover of which is provided with a sealing cover, and a side wall of the fixed tube is provided with at least two gas delivery ports for delivering different types of gases;

[0007] A rotatable connecting tube, wherein an opening is provided on the circumferential side of the rotatable connecting tube, the rotatable connecting tube is movably inserted into the fixed tube and rotatably connected to the fixed tube, so that the opening is communicated with one of the gas delivery ports;

[0008] A delivery pipe, one end of which is movably plugged into an end of the rotating connecting pipe away from the fixed pipe, the rotating connecting pipe is rotatably connected to the delivery pipe, and the other end is detachably connected to an installation pipe for delivering the gas to the shale layer.

[0009] In some embodiments, the gas conditioning device for shale oil alternate gas injection displacement further comprises:

[0010] A driving member, located at one side of the rotating connecting tube;

[0011] The transmission member is located between the driving member and the rotating connecting tube. The driving member is connected to the rotating connecting tube through the transmission member so that the rotating connecting tube rotates around an axis.

[0012] In some embodiments, the transmission member comprises:

[0013] A gear ring, arranged around the circumference of the rotating connecting tube and fixedly connected to the rotating connecting tube;

[0014] The adjusting gear is located at one side of the gear ring and is meshedly connected with the gear ring. The driving end of the driving member is connected with the adjusting gear.

[0015] In some embodiments, the gas conditioning device for shale oil alternate gas injection displacement further comprises:

[0016] The sealing ring is arranged around the circumference of the rotating connecting tube and is located between the rotating connecting tube and the fixed tube. A through hole is provided at a position corresponding to the opening of the sealing ring.

[0017] In some embodiments, a limit piece is provided along the radial direction of the delivery pipe at one end of the delivery pipe inserted into the rotating connecting pipe; the gas regulating device for shale oil alternate gas injection displacement further includes:

[0018] A movable plug is disposed around the circumference of the delivery pipe and is movably connected to the stopper, and the circumferential side wall of the movable plug is in contact with the inner side wall of the rotating connecting pipe;

[0019] An elastic member is located in the rotating connecting tube, and one end of the elastic member abuts against a side of the movable plug away from the limiting member, and the other end abuts against an inner side wall of the rotating connecting tube.

[0020] In some embodiments, the limiting member is provided with a limiting groove along the circumference of the conveying tube, the movable plug is provided with a limiting protrusion, and the limiting groove is movably placed in the limiting protrusion; or, the limiting member is provided with a limiting protrusion along the circumference of the conveying tube, and the movable plug is provided with a limiting groove, and the limiting protrusion is movably placed in the limiting groove.

[0021] In some embodiments, the gas conditioning device for shale oil alternate gas injection displacement further comprises:

[0022] A connecting shaft, located in the rotating connecting tube and rotatably connected to the rotating connecting tube;

[0023] an impeller, fixedly connected to one end of the connecting shaft and corresponding to the opening;

[0024] A first bevel gear is disposed around the other end of the connecting shaft and is fixedly connected to the connecting shaft;

[0025] A rotating shaft, rotatably connected to the rotating connecting tube, wherein the axis of the rotating shaft is parallel to the axis of the rotating connecting tube;

[0026] a second bevel gear, sleeved on a circumferential side of the rotating shaft and fixedly connected to the rotating shaft, the second bevel gear being meshed and connected with the first bevel gear;

[0027] The stirring blade is arranged around the circumference of the rotating shaft and is fixedly connected to the rotating shaft.

[0028] In some embodiments, the gas conditioning device for shale oil alternate gas injection displacement further comprises:

[0029] A connecting rod, one end of which is connected to the inner wall of the fixing tube, and the other end of which is provided with a mounting groove;

[0030] The bearing is sleeved in the mounting groove, the connecting rod is sleeved in the bearing, and the impeller and the first bevel gear are respectively located on both sides of the bearing.

[0031] In some embodiments, the gas conditioning device for shale oil alternate gas injection displacement further comprises:

[0032] A sleeve shaft is located in the fixed tube and installed on the sealing cover, and one end of the rotating shaft is movably sleeved in the sleeve shaft;

[0033] A fixed plate is located in the fixed tube and fixedly connected to the inner wall of the fixed tube. The fixed plate is provided with a transfer hole. The rotating shaft is movably sleeved in the transfer hole. The fixed plate is clamped between the second bevel gear and the stirring blade.

[0034] The second aspect of the present application provides a gas conveying device for alternate gas injection displacement of shale oil, the gas conveying device for alternate gas injection displacement of shale oil comprising:

[0035] The above-mentioned gas conditioning device for alternate gas injection displacement of shale oil;

[0036] At least two gas storage barrels are respectively connected to the gas delivery ports, and the number of the gas storage barrels is equal to the number of the gas delivery ports;

[0037] A stirring shaft is rotatably disposed in the gas storage barrel;

[0038] The stirring rod is located on the peripheral side of the stirring shaft and is fixedly connected to the stirring shaft.

[0039] According to the gas regulating device and its delivery device for shale oil alternate gas injection displacement provided by one or more embodiments of the present application, the gas regulating device for shale oil alternate gas injection displacement displacement includes a fixed pipe, a rotating connecting pipe and a delivery pipe. A sealing cover is provided at one end cover of the fixed pipe, and at least two gas delivery ports for delivering different types of gases are provided on the side wall of the fixed pipe. One end of the delivery pipe is movably plugged into the end of the rotating connecting pipe away from the fixed pipe, the rotating connecting pipe is rotatably connected to the delivery pipe, and the other end is detachably connected to the installation pipe for delivering gas to the shale layer. An opening is provided on the peripheral side of the rotating connecting pipe, the rotating connecting pipe is movably inserted in the fixed pipe and rotatably connected to the fixed pipe, so that the opening is connected to one of the gas delivery ports, then the opening can be connected to one of the gas delivery ports by rotating the rotating connecting pipe, so that the gas delivery ports can be switched more conveniently. Carbon dioxide and nitrogen can be connected to different delivery ports respectively, and the delivery port of carbon dioxide and the delivery port of nitrogen can also be switched more conveniently by rotating the rotating connecting pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the structure of a gas conditioning device for alternate gas injection displacement of shale oil in one or more embodiments of the present application;

[0041] Figure 2 for Figure 1 Sectional view along the axis;

[0042] Figure 3 It is a structural schematic diagram of a gas regulating device (including a regulating motor, a regulating gear and a gear ring) for alternate gas injection displacement of shale oil in one or more embodiments of the present application;

[0043] Figure 4 A schematic diagram of the structure of the assembly of the connecting rod, the bearing, the connecting shaft, the impeller and the first bevel gear in one or more embodiments of the present application;

[0044] Figure 5 It is a structural schematic diagram of a gas conveying device for alternate gas injection displacement of shale oil in one or more embodiments of the present application;

[0045] Figure 6 for Figure 5 Sectional view along the axis;

[0046] Figure 7 for Figure 6 A magnified schematic diagram of center A.

[0047] Description of reference numerals:

[0048] 1. Bottom plate; 2. Support seat; 3. First barrel body; 4. Second barrel body; 5. Stirring motor; 6. Stirring shaft; 7. Stirring rod; 8. Guide pipe; 9. Fixed pipe; 91. Gas outlet; 92. Sealing cover; 10. Control valve; 11. Sleeve shaft; 12. Rotating shaft; 13. Second bevel gear; 14. Stirring blade; 15. Fixed plate; 161. Rotating connecting pipe; 16. Connecting pipe; 161. Abutment; 17. Extension pipe; 171. Opening; 18. Sealing ring; 19. Through hole; 20. Connecting rod; 21. Bearing; 22. Connecting shaft; 23. Impeller; 24. First bevel gear; 25. Gear ring; 26. Spring; 27. Movable plug; 28. Delivery pipe; 29. ​​Limiting groove; 30. Mounting pipe; 31. Flange; 32. Bolt; 33. Nut; 34. Adjusting motor; 35. Adjusting gear. DETAILED DESCRIPTION

[0049] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0050] Shale oil is abundant in the world and has broad prospects for exploitation. However, the use of horizontal wells and a large number of hydraulic fracturing measures has greatly increased the cost of shale oil extraction.

[0051] Through a large number of experiments and data simulation results, it is known that gas injection can greatly improve the recovery rate of shale oil. Since carbon dioxide has a strong extraction ability for crude oil and a strong adsorption effect in organic matter, carbon dioxide injection technology has become one of the effective means of efficiently developing shale oil reservoirs with potential. However, since the use of carbon dioxide will produce a greenhouse effect, the use of carbon dioxide is limited. In order to reduce the use of carbon dioxide, carbon dioxide and nitrogen displacement of shale oil has become a hot spot in shale oil development.

[0052] The injection rate adjustment expression disclosed in the patent document "CN202011021630.9 A simulation analysis method for injection rate of CO2 / N2 alternating displacement of shale oil" can be used as a reference to adjust the injection rate of CO2 / N2 during the CO2 / N2 alternating displacement production of shale oil, thereby improving the overall efficiency of CO2 / N2 oil recovery during the actual production process, and thereby improving the recovery rate of shale oil.

[0053] When carbon dioxide and nitrogen are used to displace shale oil alternately, the delivery amount of carbon dioxide and nitrogen needs to be controlled. Therefore, the delivery ports of carbon dioxide and nitrogen need to be switched in time according to the delivery ratio of carbon dioxide and nitrogen, which can reduce the use of carbon dioxide. However, when carbon dioxide and nitrogen are used to displace shale oil alternately, since carbon dioxide and nitrogen need to be switched alternately, and since there are difficulties in switching between the delivery ports of carbon dioxide and nitrogen, it is difficult to control the delivery amount of carbon dioxide and nitrogen during gas injection, which brings inconvenience to the delivery of carbon dioxide and nitrogen, resulting in interruption of the shale oil extraction process, and it is difficult to achieve continuous extraction of shale oil.

[0054] In order to solve the technical problem in the related art that the shale oil production process is interrupted due to the difficulty in switching between the carbon dioxide delivery port and the nitrogen delivery port, the first aspect of the present application provides a gas conditioning device for shale oil alternate gas injection displacement, see Figure 1 to Figure 2 The gas regulating device for alternate gas injection and displacement of shale oil includes at least a fixed pipe 9, a rotating connecting pipe 161 and a conveying pipe 28.

[0055] The fixed tube 9 is configured to be tubular and one end of the fixed tube 9 is covered with a sealing cover 92, and the other end of the fixed tube 9 is configured to be open. The side wall of the fixed tube 9 is provided with at least two gas delivery ports 91 for delivering different types of gases, and the gas delivery ports 91 are provided at the same position along the axis of the fixed tube 9.

[0056] The rotating connecting tube 161 is movably inserted into the fixed tube 9 through the opening of the fixed tube 9, and the peripheral side wall of the rotating connecting tube 161 is spaced apart from the inner side wall of the fixed tube 9. By rotating the rotating connecting tube 161, the rotating connecting tube 161 can be rotated relative to the fixed tube 9, thereby realizing the rotating connection between the rotating connecting tube 161 and the fixed tube 9.

[0057] An opening 171 is provided on the circumferential side of the rotating connecting tube 161, and when the rotating connecting tube 161 is inserted into the fixed tube 9, the opening 171 and the gas supply port 91 on the fixed tube 9 are located at the same position along the axis of the fixed tube 9, so that the opening 171 can be connected to one of the gas supply ports 91 by rotating the rotating connecting tube 161, so that the gas supply port 91 can be switched more conveniently.

[0058] In order to improve the external aesthetics of the rotating connection between the fixed tube 9, the rotating connecting tube 161 and the conveying tube 28, the rotating connecting tube 161 may include a connecting tube 16 and an extension tube 17, the tube diameter of the connecting tube 16 is larger than the tube diameter of the extension tube 17 and the axis of the connecting tube 16 is colinear with the axis of the extension tube 17, and the connection position between the connecting tube 16 and the extension tube 17 is stepped. The diameter of the connecting tube 16 is equal to the diameter of the fixed tube 9, the diameter of the fixed tube 9 is larger than the diameter of the extension tube 17, the end of the extension tube 17 away from the connecting tube 16 is inserted into the fixed tube 9, and the delivery tube 28 can be inserted into the connecting tube 16 from the open end of the connecting tube 16 away from the extension tube 17, and the diameter of the delivery tube 28 can be equal to the diameter of the extension tube 17. In this way, by setting different sizes between the diameters of the fixed tube 9, the connecting tube 16, the extension tube 17 and the delivery tube 28, the external aesthetics of the rotating connection of the fixed tube 9, the rotating connecting tube 161 and the delivery tube 28 can be improved to a certain extent.

[0059] One end of the delivery pipe 28 is movably connected to the end of the connecting pipe 16 away from the extension pipe 17. One end of the delivery pipe 28 is rotatably connected to the connecting pipe 16, and the other end is connected to the installation pipe 30 (see FIG. 1 ) for delivering gas to the shale layer. Figures 5 to 7 The delivery pipe 28 and the mounting pipe 30 can be detachably connected by bolts 32, or by snap-fitting or the like. The specific detachable connection method is not limited in this application and can be set according to actual needs.

[0060] The installation pipe 30 extends into a deep oil well. In order to ensure the stability of the installation pipe 30 in conveying the displacement gas and to ensure the service life of the installation pipe 30, the installation pipe 30 does not rotate in the oil well. The delivery pipe 28 and the installation pipe 30 are fixedly connected by bolts 32, so that the position between the delivery pipe 28 and the installation pipe 30 is fixed. At the same time, since the air supply device connected to the gas delivery port 91 of the fixed pipe 9 needs to continuously supply gas to the fixed pipe 9, and the position of the air supply device is relatively fixed, the position of the fixed pipe 9 can be relatively fixed. Since the positions of the fixed pipe 9 and the delivery pipe 28 are fixed, and the extension pipe 17 is rotatably connected to the fixed pipe 9 while the connecting pipe 16 is also rotatably connected to the delivery pipe 28, the opening 171 on the extension pipe 17 can be made to correspond to one of the gas delivery ports 91 on the side wall of the fixed pipe 9 by rotating the connecting pipe 161, so that different gas delivery ports 91 can be switched more conveniently.

[0061] During the process of alternating gas injection displacement of shale oil, carbon dioxide and nitrogen can be transported from different gas delivery ports 91. By rotating the connecting pipe 161, the opening 171 on the extension pipe 17 can correspond to the gas delivery port 91 for transporting carbon dioxide or the gas delivery port 91 for transporting nitrogen on the side wall of the fixed pipe 9, so that carbon dioxide or nitrogen can be transported to the position in the shale layer where shale oil displacement is required through the fixed pipe 9, the extension pipe 17, the connecting pipe 16 and the delivery pipe 28 through the installation pipe 30. In this way, by rotating the connecting pipe 161 to switch the carbon dioxide gas delivery port 91 and the nitrogen gas delivery port 91, the convenience of switching the carbon dioxide gas delivery port 91 and the nitrogen gas delivery port 91 can be improved.

[0062] In order to improve the rotation convenience of the connecting tube 16, please refer to Figure 3 The gas conditioning device for alternate gas injection displacement of shale oil also includes a driving member and a transmission member, and the driving member is located on one side of the rotating connecting pipe 161. The transmission member is located between the driving member and the rotating connecting pipe 161, and the driving member is connected to the rotating connecting pipe 161 through the driving member, so that the rotating connecting pipe 161 rotates around the axis.

[0063] Specifically, see Figure 3 The transmission member includes a gear ring 25 and an adjusting gear 35. The gear ring 25 is arranged around the peripheral side of the connecting tube 16 and is fixedly connected to the connecting tube 16. The adjusting gear 35 is located on one side of the gear ring 25 and is meshedly connected to the gear ring 25, and the driving end of the driving member is connected to the adjusting gear 35. The driving member can be an adjusting motor 34, the output end of the adjusting motor 34 is fixedly connected to the adjusting gear 35, and the adjusting gear 35 is meshedly connected to the gear ring 25. The adjusting motor 34 drives the adjusting gear 35 to rotate, and the adjusting gear 35 can drive the gear ring 25 to rotate, thereby driving the connecting tube 16 and the extension tube 17 to rotate stably, so that the connecting tube 16 and the extension tube 17 can be automatically rotated by the adjusting motor 34, and the automatic rotation of the connecting tube 16 is realized. Since the bottom end of the connecting tube 16 is limited by the conveying tube 28, and the top of the extension tube 17 is limited by the fixed tube 9, the connecting tube 16 and the extension tube 17 can be stably rotated between the conveying tube 28 and the fixed tube 9.

[0064] In order to improve the sealing of the rotational connection between the extension tube 17 and the fixed tube 9, please refer to Figures 1 to 3 The gas regulating device for alternate gas injection and displacement of shale oil also includes a sealing ring 18, which is set to a circular ring structure and is sleeved on the circumferential side of the top of the extension pipe 17. The sealing ring 18 is located between the extension pipe 17 and the fixed pipe 9. The surface of the extension pipe 17 is fixedly connected to the sealing ring 18, so that the sealing ring 18 fits and seals with the inner wall of the fixed pipe 9.

[0065] A through hole 19 is provided at the corresponding position between the sealing ring 18 and the opening 171 , so that the opening 171 on the extension tube 17 and the through hole 19 on the sealing ring 18 can be connected to the gas delivery port 91 for delivering carbon dioxide or the gas delivery port 91 for delivering nitrogen on the side wall of the fixed tube 9 by rotating the connecting tube 161 .

[0066] The sealing ring 18 is used to improve the sealing performance between the extension tube 17 and the fixed tube 9, so that the extension tube 17 can be sealed and rotated inside the fixed tube 9 to prevent gas from leaking from the gap between the fixed tube 9 and the extension tube 17. It should be noted that the sealing ring 18 can also be fixedly connected to the inner wall of the fixed tube 9 so that the sealing ring 18 and the surface of the extension tube 17 are in close contact and sealed.

[0067] The connecting tube 16 and the extension tube 17 are driven to rotate by adjusting the motor 34, so that the extension tube 17 rotates inside the fixed tube 9, and the sealing ring 18 on the surface of the extension tube 17 adheres to the inner wall of the fixed tube 9 and rotates in a sealed manner, thereby achieving effective sealing at the connection between the fixed tube 9 and the extension tube 17.

[0068] In order to ensure that the connection pipe 16 rotates relative to the delivery pipe 28, the sealing of the rotational connection between the connection pipe 16 and the delivery pipe 28 can also be ensured. Figures 2 to 3 , a limiting member (not shown in the figure) is provided along the radial direction of the delivery pipe 28 at one end of the delivery pipe 28 inserted into the connecting pipe 16. The gas delivery device for alternating gas injection displacement of shale oil also includes a movable plug 27 and an elastic member (not shown in the figure). The movable plug 27 is arranged around the circumference of the delivery pipe 28 and is movably connected to the limiting member, and the connecting pipe 16 is slidably connected to the movable plug 27 through the limiting member. The interior of the connecting pipe 16 is slidably connected to the movable plug 27, and the peripheral side wall of the movable plug 27 is in contact with the inner side wall of the rotating connecting pipe 161. The stepped structure between the connecting pipe 16 and the extension pipe 17 forms an abutment portion 161, and the movable plug 27 abuts against the abutment portion 161 through the spring 26, and the movable plug 27 is in contact with the peripheral edge of the top of the delivery pipe 28.

[0069] The elastic member is located in the rotating connecting tube 161, and one end of the elastic member abuts against the side of the movable plug 27 away from the stopper, and the other end abuts against the inner wall of the rotating connecting tube 161. The elastic member can be a spring 26, and the elasticity of the spring 26 pushes the movable plug 27 to move along the axis of the connecting tube 16, so that the movable plug 27 abuts against the stopper to achieve stable fit with the delivery tube 28. In this way, while ensuring the relative rotation between the connecting tube 16 and the delivery tube 28, the movable plug 27 can also be closely fitted with the inner wall of the connecting tube 16, which is conducive to improving the sealing performance between the delivery tube 28 and the connecting tube 16, and can prevent gas leakage.

[0070] See also Figure 3The limiting member is provided with a limiting groove 29 along the circumference of the delivery tube 28, and the movable plug 27 is provided with a limiting protrusion (not shown in the figure), and the limiting groove 29 is movably clamped in the limiting protrusion. The limiting groove 29 is located at the top of the delivery tube 28, and the limiting groove 29 is engaged and connected with the movable plug 27, and the cross-sectional shape of the movable plug 27 is a U-shaped structure. The spring 26 in the connecting tube 16 pushes the movable plug 27 to move, so that the movable plug 27 is against the limiting groove 29 at the top of the delivery tube 28. The elasticity of the spring 26 pushes the movable plug 27 to move in the connecting tube 16, so that the limiting protrusion of the movable plug 27 is engaged in the limiting groove 29 of the delivery tube 28, so as to achieve a stable fit between the movable plug 27 and the delivery tube 28. At the same time, the movable plug 27 is deformed by the extrusion force generated by the spring 26, so that the movable plug 27 abuts against the inner wall of the connecting pipe 16, thereby achieving effective sealing of the connecting position between the connecting pipe 16 and the delivery pipe 28, which is beneficial to improving the sealing performance, preventing leakage of the displacement gas, and ensuring safe production.

[0071] In some embodiments, the limiting member is provided with a limiting protrusion along the circumference of the delivery tube 28, and the movable plug 27 is provided with a limiting groove, and the limiting protrusion is movably inserted into the limiting groove. The elasticity of the spring 26 pushes the movable plug 27 to move inside the connecting tube 16, so that the limiting groove of the movable plug 27 is embedded in the limiting protrusion of the delivery tube 28 to achieve stable fit with the delivery tube 28.

[0072] When alternately injecting gas into the shale layer, the gas delivery port 91 for delivering different gases can be switched by rotating the connecting pipe 16 and the extension pipe 17. The use of the sealing ring 18 and the movable plug 27 can ensure the effective sealing of the pipeline connection, avoid gas leakage, and help improve the safety of mining. At the same time, the gas delivery port 91 for delivering different gases can be quickly switched, which is conducive to the continuous injection of displacement gas during shale oil mining and the continuous mining of shale oil.

[0073] In order to increase the oil recovery rate of shale oil, when using carbon dioxide or nitrogen to displace shale oil, additives need to be mixed in the carbon dioxide and nitrogen. The additives are used to improve the efficiency of shale oil extraction, such as oil displacement agents, increase the foaming properties of crude oil, block gas crossflow, and improve crude oil recovery.

[0074] In order to improve the crude oil recovery rate, the additive needs to be fully mixed with carbon dioxide or nitrogen. When displacing shale oil, carbon dioxide or nitrogen can directly contact with crude oil, increase the foaming property of crude oil, block gas crossflow, and improve crude oil recovery rate.

[0075] To ensure that the carbon dioxide or nitrogen is thoroughly mixed with the additive, refer to Figure 3 to Figure 4The gas regulating device for alternate gas injection displacement of shale oil also includes a connecting shaft 22, an impeller 23, a first bevel gear 24, a rotating shaft 12, a second bevel gear 13 and a stirring blade 14. The connecting shaft 22 is located in the extension tube 17 and is rotatably connected to the extension tube 17. The impeller 23 is fixedly connected to one end of the connecting shaft 22 and corresponds to the opening 171. The first bevel gear 24 is arranged around the other end of the connecting shaft 22. The rotating shaft 12 is rotatably connected to the extension tube 17, and the axis of the rotating shaft 12 is parallel to the axis of the extension tube 17. The second bevel gear 13 is sleeved on the circumference of the rotating shaft 12 and is fixedly connected to the rotating shaft 12, and the second bevel gear 13 is meshed with the first bevel gear 24. The stirring blade 14 is arranged around the circumference of the rotating shaft 12 and is fixedly connected to the rotating shaft 12. In this way, the displacement gas flows through the gas delivery port 91, through the through hole 19 on the sealing ring 18 and the opening 171 on the extension tube 17, and is delivered to the extension tube 17. The flow of gas can rotate the impeller 23, and the rotation of the impeller 23 drives the connecting shaft 22 to rotate. The first bevel gear 24 is meshed with the second bevel gear 13, so that the second bevel gear 13 drives the rotating shaft 12 to rotate, and then the stirring blade 14 fixedly connected to the rotating shaft 12 rotates. When the gas passes through the stirring blade 14, the additive is fully mixed with the carbon dioxide or nitrogen under the stirring action of the stirring blade 14.

[0076] In order to improve the smoothness of rotation of the rotating shaft 12, the gas regulating device for alternating gas injection displacement of shale oil also includes a connecting rod 20 and a bearing 21. One end of the connecting rod 20 is connected to the inner wall of the fixed tube 9, and the other end is provided with a mounting groove (not shown in the figure). A plurality of evenly distributed connecting rods 20 are arranged in the extension tube 17, and the plurality of connecting rods 20 are fixedly connected and the ends are surrounded by mounting grooves. The bearing 21 is located in the mounting groove and is fixedly connected to the plurality of connecting rods 20. The connecting shaft 22 is sleeved in the bearing 21, and the impeller 23 and the first bevel gear 24 are respectively located on both sides of the bearing 21. The impeller 23 is distributed between the plurality of connecting rods 20, and the impeller 23 is correspondingly arranged on one side of the opening 171. The connecting shaft 22 is connected to the mounting groove through the bearing 21, which can improve the smoothness of the rotation of the connecting shaft 22 in the mounting groove.

[0077] In order to facilitate the rotation of the shaft 12 in the extension tube 17 and the connecting tube 16, please refer to Figure 3 The gas conditioning device for alternate gas injection displacement of shale oil also includes a sleeve shaft 11 and a fixed plate 15. The sleeve shaft 11 is located in the fixed tube 9 and installed on the sealing cover 92, and one end of the rotating shaft 12 is movably sleeved in the sleeve shaft 11. The fixed plate 15 is located in the fixed tube 9 and is fixedly connected to the inner wall of the fixed tube 9. The fixed plate 15 is provided with a transfer hole (not shown in the figure), and the rotating shaft 12 is movably sleeved in the transfer hole. The fixed plate 15 is sandwiched between the second bevel gear 13 and the stirring blade 14.

[0078] It can be understood that the inner wall of the extension tube 17 is fixedly connected to the bearing 21 through the connecting rod 20, the bearing 21 is fixedly connected to the connecting shaft 22, and the two ends of the connecting shaft 22 are respectively fixedly connected to the impeller 23 and the first bevel gear 24. The sealing cover 92 at the top of the fixed tube 9 is fixedly connected to the sleeve shaft 11, the sleeve shaft 11 is rotatably connected to the rotating shaft 12, the two ends of the rotating shaft 12 are respectively fixedly connected to the second bevel gear 13 and the stirring blade 14, and the second bevel gear 13 is meshed with the first bevel gear 24. The impeller 23 is located on one side of the opening 171, which can make the gas contact with the impeller 23 during delivery, and the thrust generated during gas delivery drives the impeller 23 to rotate, thereby driving the first bevel gear 24 to rotate. The bearing 21 is fixed in the extension tube 17 by the connecting rod 20, so that the connecting shaft 22 can stably rotate inside the bearing 21. When the gas delivered from the gas delivery port 91 enters the fixed tube 9, the gas can contact the impeller 23, and the impeller 23 drives the connecting shaft 22 and the first bevel gear 24 to rotate, thereby realizing the transmission of the second bevel gear 13 and the rotating shaft 12.

[0079] The sealing cover 92 of the fixed tube 9 is provided with a sleeve shaft 11, the sleeve shaft 11 is movably sleeved with the rotating shaft 12, the fixed plate 15 is fixedly connected to the inner wall of the fixed tube 9, the fixed plate 15 is rotatably connected to the rotating shaft 12, and the fixed plate 15 is located between the second bevel gear 13 and the stirring blade 14. The rotating shaft 12 extends into the extension tube 17 and the connecting tube 16, and the stirring blade 14 connected to the bottom of the rotating shaft 12 can rotate in the extension tube 17 and the connecting tube 16. The sleeve shaft 11 can realize the rotation of the rotating shaft 12 and cooperate with the fixed plate 15 so that the rotating shaft 12 can stably rotate inside the fixed plate 15 and the sleeve shaft 11. During gas transportation, the impeller 23 drives the first bevel gear 24 to rotate through the connecting shaft 22, and the first bevel gear 24 drives the second bevel gear 13 and the rotating shaft 12 to rotate at the same time, thereby driving the stirring blade 14 at the bottom of the rotating shaft 12 to rotate, so that the gas is mixed evenly during the transportation process, which is conducive to improving the displacement effect of crude oil.

[0080] The second aspect of the present application provides a gas delivery device for alternate gas injection displacement of shale oil, see Figures 5 to 7 The gas conveying device for alternate gas injection and displacement of shale oil includes the above-mentioned gas regulating device for alternate gas injection and displacement of shale oil, a gas storage barrel, a stirring shaft 6 and a stirring rod 7.

[0081] There are at least two gas storage barrels, which are respectively connected to the gas delivery port 91, and the number of gas storage barrels is equal to the number of gas delivery ports 91. The stirring shaft 6 is rotatably arranged in the gas storage barrel, and the stirring rod 7 is located on the peripheral side of the stirring shaft 6 and fixedly connected to the stirring shaft 6.

[0082] See also Figures 5 to 7The two gas storage barrels can be the first barrel 3 and the second barrel 4 respectively. In order to facilitate the fixation of the first barrel 3 and the second barrel 4, the gas delivery device for shale oil alternate gas injection displacement also includes a bottom plate 1 and two support seats 2. The first barrel 3 and the second barrel 4 are placed on the bottom plate 1 respectively, and the bottom plate 1 is fixedly installed with the first barrel 3 and the second barrel 4 respectively through the two support seats 2, and the two support seats 2 are used to support and fix the first barrel 3 and the second barrel 4 respectively.

[0083] Two support seats 2 are fixedly installed on the bottom plate 1, and the two support seats 2 are symmetrically distributed on both sides of the bottom plate 1. The tops of the two support seats 2 are respectively fixedly connected to the first barrel 3 and the second barrel 4. The first barrel 3 and the second barrel 4 are respectively set as cylindrical structures, and the first barrel 3 and the second barrel 4 are respectively used to store carbon dioxide and nitrogen for shale oil displacement.

[0084] In order to facilitate the connection between the first barrel body 3 and the second barrel body 4 and the fixed pipe 9 respectively, the gas conveying device for alternating gas injection and displacement of shale oil also includes a guide pipe 8, and the bottom ends of the first barrel body 3 and the second barrel body 4 are respectively connected with the guide pipe 8, and the two guide pipes 8 are respectively connected with the gas delivery ports 91 on the fixed pipe 9 for conveying different types of gases.

[0085] The flow guide pipe 8 is used to transport the gas inside the first barrel body 3 and the second barrel body 4, and the gas is transported to the inside of the fixed pipe 9 through the flow guide pipe 8 to achieve stable transportation of the displacement gas. The middle part of the bottom plate 1 is fixedly connected to the delivery pipe 28, the connecting pipe 16 is rotatably connected to the inside of the delivery pipe 28, and the extension pipe 17 is rotatably connected to the inside of the fixed pipe 9. The connecting pipe 16 and the extension pipe 17 can realize the alternating transportation of different gases during gas transportation.

[0086] There are two flow guide pipes 8, which are respectively located between the first barrel body 3 and the fixed pipe 9 and between the second barrel body 4 and the fixed pipe 9. The flow guide pipes 8 are symmetrically distributed on both sides of the fixed pipe 9, and both sides of the fixed pipe 9 are connected to the bottom ends of the first barrel body 3 and the second barrel body 4 through the flow guide pipes 8. In order to more accurately control the amount of gas transported from the first barrel body 3 and the second barrel body 4 to the fixed pipe 9 through the flow guide pipes 8, the flow guide pipe 8 may be connected to a control valve 10. There are two control valves 10, which are respectively located on both sides of the fixed pipe 9. The flow guide pipe 8 is used to transport gas to the inside of the fixed pipe 9, and a control valve 10 is provided on the flow guide pipe 8 to adjust the gas delivery amount and delivery pressure to ensure the stable delivery of the displacement gas.

[0087] See also Figure 7The surface of the extension tube 17 is fixedly connected to the sealing ring 18, an opening 171 is provided on one side of the extension tube 17, and a through hole 19 is provided on one side of the sealing ring 18. The opening 171 and the through hole 19 can be set to a circular structure, and the diameter of the opening 171 and the diameter of the through hole 19 are respectively the same as the inner diameter of the guide tube 8, so that the gas in the guide tube 8 can be smoothly transported to the fixed tube 9 through the opening 171 and the through hole 19.

[0088] See also Figure 5 to Figure 6 A stirring motor 5 is arranged on the top of the first barrel body 3, and the output end of the stirring motor 5 is fixedly connected to the stirring shaft 6. A plurality of stirring rods 7 are evenly fixedly connected to the circumference of the stirring shaft 6. The stirring motor 5 can drive the stirring shaft 6 to rotate in the first barrel body 3. When the stirring shaft 6 drives the stirring rods 7 to rotate, the gas and the additive in the first barrel body 3 are effectively mixed, ensuring that the gas is fully mixed with the additive during transportation and then transported to the fixed pipe 9.

[0089] A stirring motor 5 may also be provided on the top of the second barrel 4, the output end of the stirring motor 5 is fixedly connected to the stirring shaft 6, and a plurality of stirring rods 7 are evenly fixedly connected to the circumference of the stirring shaft 6. The stirring motor 5 can drive the stirring shaft 6 to rotate in the second barrel 4. When the stirring shaft 6 drives the stirring rods 7 to rotate, the gas and the additive in the second barrel 4 are effectively mixed, ensuring that the gas is fully mixed with the additive during transportation and then transported to the fixed pipe 9.

[0090] During gas transportation, effective mixing of gas and additives can be achieved in the first barrel body 3 or the second barrel body 4, and when alternate gas injection is performed in the connecting pipe 16 and the extension pipe 17, further sufficient mixing of gas and additives can be achieved, which is beneficial to improving the effect of alternate gas injection displacement and ensuring efficient exploitation of shale oil.

[0091] See also Figure 6 to Figure 7 , the delivery pipe 28 passes through the middle of the bottom plate 1 and extends out of the top of the bottom plate 1, and the connecting pipe 16 is rotatably connected to the delivery pipe 28. A mounting pipe 30 is provided at the bottom end of the delivery pipe 28, and flanges 31 are fixedly connected to the adjacent ends of the mounting pipe 30 and the delivery pipe 28. The flanges 31 are fitted and connected to each other, the edges of the flanges 31 are connected through bolts 32, and the ends of the bolts 32 are threadedly connected to nuts 33. The bottom plate 1 is installed at the wellhead of shale oil extraction, and the flange 31 at the bottom end of the delivery pipe 28 is connected to the mounting pipe 30, and the connection and fixation between the delivery pipe 28 and the mounting pipe 30 are achieved through the cooperation of bolts 32 and nuts 33, which is convenient for construction and can achieve stable gas transportation.

[0092] In the present application, the gas delivery device for alternate gas injection displacement of shale oil adopts the first barrel 3 and the second barrel 4 to realize the gas delivery during the alternate gas injection during shale oil exploitation. The first barrel 3 and the second barrel 4 are stably supported by the support seat 2, and the stirring shaft 6 and the stirring rod 7 are driven to rotate by the stirring motor 5, so that the gas inside the first barrel 3 and the second barrel 4 can be fully mixed with the additive. It is transported to the inside of the fixed pipe 9 through the guide pipe 8, and when the adjusting gear 35 is driven to rotate by the adjusting motor 34, the adjusting gear 35 drives the gear ring 25, the connecting pipe 16 and the extension pipe 17 to rotate at the same time, so that the position of the opening 171 at the top of the extension pipe 17 changes. After the opening 171 corresponds to the guide pipe 8, the gas in the corresponding guide pipe 8 enters the fixed pipe 9.

[0093] During gas delivery, the gas contacts the impeller 23 through the opening 171, driving the connecting shaft 22 to rotate at the bearing 21, the connecting shaft 22 drives the first bevel gear 24 to rotate, the first bevel gear 24 drives the second bevel gear 13 to rotate, and the second bevel gear 13 drives the rotating shaft 12 to rotate, so that the rotating shaft 12 rotates inside the sleeve shaft 11 and the fixing plate 15 respectively, so that the rotating shaft 12 can drive the stirring blade 14 to rotate, so that the displacement gas can be fully mixed and then enter the inside of the delivery pipe 28. The delivery pipe 28 is connected to the mounting pipe 30 through the flange 31, and the assembly and fixation between the delivery pipe 28 and the mounting pipe 30 are realized by the cooperation of the bolt 32 and the nut 33, thereby realizing the delivery of gas.

[0094] When the connecting tube 16 and the extension tube 17 are driven to rotate by adjusting the motor 34, the extension tube 17 is rotated in the fixed tube 9, and the sealing ring 18 on the surface of the extension tube 17 is attached to the inner wall of the fixed tube 9 and rotates in a sealed manner, thereby achieving effective sealing at the connection between the fixed tube 9 and the extension tube 17. The spring 26 in the connecting tube 16 pushes the movable plug 27 to move, so that the movable plug 27 abuts against the limit groove 29 at the top of the delivery tube 28, and effective sealing is achieved through the elasticity of the spring 26. The generated extrusion force causes the movable plug 27 to deform so that the movable plug 27 abuts against the inner wall of the connecting tube 16, thereby achieving effective sealing at the connection between the connecting tube 16 and the delivery tube 28, which is beneficial to improving the sealing performance and preventing the displacement gas from leaking, and is beneficial to ensuring safe production.

[0095] During alternating gas injection, gas transportation is achieved through the guide pipe 8 and the fixed pipe 9. When gas transportation is carried out through the connecting pipe 16 and the extension pipe 17, the position of the opening 171 is changed by rotating the connecting pipe 16 and the extension pipe 17, and the transportation channels of different gases are switched to achieve rapid operation during alternating gas injection, which is beneficial to the continuous injection of displacement gas during shale oil exploitation and realizes continuous exploitation of shale oil.

[0096] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0097] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0098] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0099] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0100] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A gas conditioning device for alternate gas injection displacement of shale oil, characterized in that: include: A fixed tube, one end cover of which is provided with a sealing cover, and a side wall of the fixed tube is provided with at least two gas delivery ports for delivering different types of gases; A rotatable connecting tube, wherein an opening is provided on the circumferential side of the rotatable connecting tube, the rotatable connecting tube is movably inserted into the fixed tube and rotatably connected to the fixed tube, so that the opening is communicated with one of the gas delivery ports; A delivery pipe, one end of which is movably plugged into an end of the rotating connecting pipe away from the fixed pipe, the rotating connecting pipe is rotatably connected to the delivery pipe, and the other end is detachably connected to an installation pipe for delivering the gas to the shale layer.

2. The gas conditioning device for shale oil alternate gas injection displacement according to claim 1, characterized in that: The gas conditioning device for alternate gas injection displacement of shale oil also includes: A driving member, located at one side of the rotating connecting tube; The transmission member is located between the driving member and the rotating connecting tube. The driving member is connected to the rotating connecting tube through the transmission member so that the rotating connecting tube rotates around an axis.

3. The gas conditioning device for shale oil alternate gas injection displacement according to claim 2, characterized in that: The transmission member comprises: A gear ring, arranged around the circumference of the rotating connecting tube and fixedly connected to the rotating connecting tube; The adjusting gear is located at one side of the gear ring and is meshedly connected with the gear ring. The driving end of the driving member is connected with the adjusting gear.

4. The gas conditioning device for shale oil alternate gas injection displacement according to claim 1, characterized in that: The gas conditioning device for alternate gas injection displacement of shale oil also includes: The sealing ring is arranged around the circumference of the rotating connecting tube and is located between the rotating connecting tube and the fixed tube. A through hole is provided at a position corresponding to the opening of the sealing ring.

5. The gas conditioning device for shale oil alternate gas injection displacement according to claim 1, characterized in that: One end of the delivery pipe inserted into the rotating connecting pipe is provided with a limiting member along the radial direction of the delivery pipe; the gas regulating device for shale oil alternate gas injection displacement also includes: A movable plug is disposed around the circumference of the delivery pipe and is movably connected to the stopper, and the circumferential side wall of the movable plug is in contact with the inner side wall of the rotating connecting pipe; An elastic member is located in the rotating connecting tube, and one end of the elastic member abuts against a side of the movable plug away from the limiting member, and the other end abuts against an inner side wall of the rotating connecting tube.

6. The gas conditioning device for shale oil alternate gas injection displacement according to claim 5, characterized in that: The limiting member is provided with a limiting groove along the circumference of the conveying pipe, the movable plug is provided with a limiting protrusion, and the limiting groove is movably placed in the limiting protrusion; or, the limiting member is provided with a limiting protrusion along the circumference of the conveying pipe, and the movable plug is provided with a limiting groove, and the limiting protrusion is movably placed in the limiting groove.

7. The gas conditioning device for shale oil alternate gas injection displacement according to claim 1, characterized in that: The gas conditioning device for alternate gas injection displacement of shale oil also includes: A connecting shaft, located in the rotating connecting tube and rotatably connected to the rotating connecting tube; an impeller, fixedly connected to one end of the connecting shaft and corresponding to the opening; A first bevel gear is disposed around the other end of the connecting shaft and is fixedly connected to the connecting shaft; A rotating shaft, rotatably connected to the rotating connecting tube, wherein the axis of the rotating shaft is parallel to the axis of the rotating connecting tube; a second bevel gear, sleeved on a circumferential side of the rotating shaft and fixedly connected to the rotating shaft, the second bevel gear being meshed and connected with the first bevel gear; The stirring blade is arranged around the circumference of the rotating shaft and is fixedly connected to the rotating shaft.

8. The gas conditioning device for shale oil alternate gas injection displacement according to claim 7, characterized in that: The gas conditioning device for alternate gas injection displacement of shale oil also includes: A connecting rod, one end of which is connected to the inner wall of the fixing tube, and the other end of which is provided with a mounting groove; The bearing is sleeved in the mounting groove, the connecting rod is sleeved in the bearing, and the impeller and the first bevel gear are respectively located on both sides of the bearing.

9. The gas conditioning device for shale oil alternate gas injection displacement according to claim 7, characterized in that: The gas conditioning device for alternate gas injection displacement of shale oil also includes: A sleeve shaft is located in the fixed tube and installed on the sealing cover, and one end of the rotating shaft is movably sleeved in the sleeve shaft; A fixed plate is located in the fixed tube and fixedly connected to the inner wall of the fixed tube. The fixed plate is provided with a transfer hole. The rotating shaft is movably sleeved in the transfer hole. The fixed plate is clamped between the second bevel gear and the stirring blade.

10. A gas delivery device for alternate gas injection displacement of shale oil, characterized in that: include: A gas conditioning device for alternate gas injection displacement of shale oil as claimed in any one of claims 1 to 9; At least two gas storage barrels are respectively connected to the gas delivery ports, and the number of the gas storage barrels is equal to the number of the gas delivery ports; A stirring shaft is rotatably disposed in the gas storage barrel; The stirring rod is located on the peripheral side of the stirring shaft and is fixedly connected to the stirring shaft.

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