Continuous mixing device for oil field fracturing

Abstract

The invention belongs to the technical field of mixing, in particular to a continuous mixing device for oil field fracturing, and provides the following scheme that the continuous mixing device comprises a mixing box and a water supply box, a first mixing bin and a second mixing bin are arranged in the mixing box, and a communication opening is formed between the position, located at the bottom, of one side of the first mixing bin and the second mixing bin in a penetrating mode; a second water inlet pipeline is arranged between the first mixing bin and the water supply tank, a first flow meter is arranged on one side of the second water inlet pipeline, and one end of the second water inlet pipeline is located at the bottom of the water supply tank; the tops of the first mixing bin and the second mixing bin are respectively connected with a first bin cover and a second bin cover through bolts. The equipment is small in occupied space, high in information integration level and accurate in metering, all operations are completed by the controller, the labor input is reduced, the produced mixed liquid is uniformly dispersed, no fisheye is generated, and the sticking effect is good.

Description

Technical Field

[0001] This invention relates to the field of mixing, and more particularly to a continuous mixing device for oilfield fracturing. Background Technology

[0002] Domestic vertical well fracturing is subject to objective limitations such as small fracturing fluid volume and limited space during construction. The main method used is jet fluid mixing technology, which utilizes the principle that water at high speed passing through a pipeline will generate negative pressure to mix thickener with clean water.

[0003] A search revealed Chinese patent application CN212348455U, which discloses a dedicated mixing device for fracturing flowback fluid in oil and gas fields. The device includes: a main body comprising a dynamic thickening structure and a flow guiding structure connected to the dynamic thickening structure; a mixing structure positioned above and connected to the dynamic thickening structure; a uniform feeding structure positioned on the upper surface of the mixing structure and connected to it; a precision metering feeding structure positioned on the upper surface of the uniform feeding structure and connected to it, used for metering the powder fed into the uniform feeding structure; and a liquid inlet structure connected to the mixing structure for feeding liquid into the mixing structure. This dedicated mixing device for fracturing flowback fluid in oil and gas fields has the advantages of preventing foaming during secondary mixing of fracturing flowback fluid, effectively avoiding the incomplete elimination of "fish-eye" clumps, incomplete swelling of the thickener, and reduction in the base fluid concentration.

[0004] Existing equipment requires a large space and increased manual labor during mixing, and the resulting mixture is unevenly dispersed, easily causing fish-eyes and poor adhesion, thus affecting the mixing process in oilfield fracturing. Summary of the Invention

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A continuous mixing device for oilfield fracturing includes a mixing tank and a water supply tank. The mixing tank contains a first mixing chamber and a second mixing chamber. A connecting opening is formed between the first and second mixing chambers, located at the bottom of one side of the first mixing chamber. A sealing mechanism is installed inside the connecting opening. A second water inlet pipe connects the first mixing chamber and the water supply tank. A first flow meter is installed on one side of the second water inlet pipe, and one end of the second water inlet pipe is located at the bottom of the water supply tank. A first chamber cover and a second chamber cover are bolted to the tops of the first and second mixing chambers, respectively. A first stirring mechanism is provided between the first silo cover and the first mixing silo, and a second stirring mechanism is provided between the second silo cover and the second mixing silo. A controller is bolted to one side of the top of the second silo cover. A water inlet is provided on one side of the top of the first silo cover, and a third valve is connected to the top of the water inlet via a flange. A second discharge pipe is connected to the top of the third valve via a flange, and a first discharge pipe is provided on one side of the second discharge pipe. A weighing storage silo is provided on the top of the first discharge pipe, and a discharge meter is bolted to one side of the weighing storage silo.

[0007] Preferably, a water inlet hole is provided through one side of the water supply tank near the top, and a first water inlet pipe is connected to one side of the water inlet hole via a flange. A first valve is connected to the bottom of the first water inlet pipe via a flange, and a water inlet is provided at the bottom of the first valve.

[0008] Preferably, a water outlet is provided on one side of the second mixing chamber, and a mixed liquid discharge pipe is fixed on the inner wall of the water outlet. One end of the mixed liquid discharge pipe is located at the bottom of the second mixing chamber. A second flow meter is provided on one side of the mixed liquid discharge pipe. A second valve is connected to the bottom of the mixed liquid discharge pipe through a flange. A mixed liquid outlet is provided at the bottom of the second valve.

[0009] Preferably, the sealing mechanism consists of a turntable, a connecting rod, and a sealing plate, with the top of the sealing plate connected to the bottom of the connecting rod by bolts, a through hole provided at the top of the communication port, and a rotatable connection between the through hole and the connecting rod via a bearing, and the top of the connecting rod welded to the bottom of the turntable.

[0010] Preferably, the first stirring mechanism comprises a first motor, a first rotating rod, a connecting sleeve, and two first stirring blades. The top of the first rotating rod is rotatably connected to the first chamber cover via a bearing. The top of the first chamber cover is connected to the first motor via bolts. One end of the first motor is fixedly connected to the first rotating rod. The connecting sleeve is fixedly sleeved on the outer wall of the first rotating rod. The two first stirring blades are symmetrically fixed on the outer circumferential wall of the connecting sleeve.

[0011] Preferably, the second stirring mechanism consists of a second motor, a second rotating rod, and a plurality of second stirring blades. The top of the second rotating rod is rotatably connected to the second chamber cover via a bearing. The plurality of second stirring blades are fixed at equal intervals above the outer circumference of the second rotating rod. The top of the second chamber cover is connected to the second motor via bolts. One end of the second motor is fixedly connected to the second rotating rod.

[0012] Preferably, a tumbling mechanism is provided on one side of the first stirring mechanism, and the tumbling mechanism and the first stirring mechanism cooperate with each other.

[0013] Preferably, the stirring mechanism includes multiple support plates, multiple racks, a main shaft, a driving wheel, two secondary shafts, two driven wheels, two shafts, two support sleeves, and multiple stirring plates. The multiple support plates are fixed at equal intervals in a ring at the bottom of the first mixing chamber. One side of the rack is connected to the support plate by bolts. The rack is arc-shaped. A stirring port is opened through one side of the first stirring blade. The two ends of the main shaft are rotatably connected to the stirring port by bearings. The driving wheel is fixedly sleeved on the outer wall of the main shaft. A gear shaft is welded to the bottom of the main shaft. A gear is fixedly sleeved on the outer wall of the gear shaft. The gear meshes with the rack. The two secondary shafts are rotatably connected to the stirring port by bearings. The two driven wheels are fixedly sleeved on the outer wall of the secondary shafts. The two driven wheels mesh with the two sides of the driving wheel. One end of each of the two shafts is welded to the two secondary shafts. The two shafts are obliquely symmetrically distributed. The support sleeves are fixedly sleeved on the outer wall of the shafts. Multiple stirring plates are fixed at equal intervals on the circumferential outer wall of the support sleeves. The shafts are lightning-shaped.

[0014] The beneficial effects of this invention are as follows:

[0015] 1. This invention, through the establishment of a first stirring mechanism and a second stirring mechanism, allows for continuous mixing. During this process, the controller collects all status data of the device and sends execution commands to each component. The water supply tank provides a stable water supply to the equipment, the first flow meter feeds back the real-time flow rate to the controller, and the feeding metering device uniformly and quantitatively transports the material inside the weighing storage bin to the mixing bin. When water and material enter the first mixing bin, the first stirring mechanism pre-mixes the material. During this process, the sealing mechanism is activated, and the pre-mixed liquid is transported to the second mixing bin through the connecting port. The second stirring mechanism then stirs and viscous the pre-mixed material again. After the mixture is prepared, it is transported to other devices through the first water inlet pipe and the mixed liquid discharge pipe. The second flow meter feeds back the real-time output to the controller. In this invention, the equipment occupies little space, has high information integration, and accurate measurement. All operations are completed by the controller, reducing manual input. The produced mixed liquid is evenly dispersed, without fish eyes, and has a good viscous effect.

[0016] 2. This invention, through the provision of a first stirring mechanism and a tumbling mechanism, allows the first stirring blade to rotate synchronously with the rotation of the first rotating rod when the material is stirred by the first stirring mechanism. When the gear meshes with the rack during rotation, the gear drives the main shaft to rotate under the meshing action of the rack. Simultaneously, the main shaft drives the driving wheel to rotate. At this time, the meshing between the driving wheel and the two driven wheels causes the driven wheels to drive the shaft to rotate. Since the two shafts are obliquely symmetrically distributed, the stirring plates will stir the material in an alternating manner. Because the shaft is lightning-shaped, the stirring plates will rotate around the secondary shaft as the center. Thus, the cooperation between the first stirring mechanism and the tumbling mechanism can effectively stir the material. The tumbling mechanism can stir the material deposited at the bottom of the first mixing chamber, preventing the material from being unable to be effectively stirred and mixed, thereby affecting the mixing effect of the material. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a continuous mixing device for oilfield fracturing proposed in this invention;

[0018] Figure 2 This is a schematic diagram of the main structure of a continuous mixing device for oilfield fracturing proposed in this invention;

[0019] Figure 3 This is a side view of a continuous mixing device for oilfield fracturing proposed in this invention.

[0020] Figure 4 This is a cross-sectional structural schematic diagram of a continuous mixing device for oilfield fracturing proposed in this invention;

[0021] Figure 5 This is a schematic diagram of the sealing mechanism of a continuous mixing device for oilfield fracturing proposed in this invention;

[0022] Figure 6 This is a schematic diagram of the first stirring mechanism of a continuous mixing device for oilfield fracturing proposed in this invention.

[0023] Figure 7 for Figure 6 The structural diagram at point A is presented in the text;

[0024] Figure 8 This is a schematic diagram of the second stirring mechanism of a continuous mixing device for oilfield fracturing proposed in this invention.

[0025] In the attached diagram: 1. Mixing tank; 2. Water supply tank; 3. Water inlet; 4. First valve; 5. First water inlet pipe; 6. First discharge pipe; 7. Weighing storage silo; 8. Discharge meter; 9. Second discharge pipe; 10. First silo cover; 11. Second silo cover; 12. Controller; 13. Mixture discharge pipe; 14. Second valve; 15. Mixture outlet; 16. Third valve; 17. Sealing mechanism; 18. First stirring mechanism; 19. Second stirring mechanism; 20. Second water inlet pipe; 21. First flow rate. 22. Second flow meter; 23. First mixing chamber; 24. Second mixing chamber; 25. Connecting rod; 26. Turntable; 27. Sealing plate; 28. First motor; 29. ​​First rotating rod; 30. Connecting sleeve; 31. First stirring blade; 32. Main shaft; 33. Driving wheel; 34. Secondary shaft; 35. Driven wheel; 36. Shaft; 37. Support sleeve; 38. Stirring plate; 39. Support plate; 40. Rack; 41. Gear shaft; 42. Gear; 43. Second motor; 44. Second rotating rod; 45. Second stirring blade. Detailed Implementation

[0026] Example 1, referring to Figures 1-8 A continuous mixing device for oilfield fracturing includes a mixing tank 1 and a water supply tank 2. The mixing tank 1 contains a first mixing chamber 23 and a second mixing chamber 24. A connecting opening is formed between the first mixing chamber 23 (located at the bottom) and the second mixing chamber 24, and a sealing mechanism 17 is installed inside the connecting opening. A second water inlet pipe 20 is connected between the first mixing chamber 23 and the water supply tank 2, and a first flow meter 21 is installed on one side of the second water inlet pipe 20. One end of the second water inlet pipe 20 is located at the bottom of the water supply tank 2. A first chamber cover 10 and a second chamber cover 11 are bolted to the tops of the first mixing chamber 23 and the second mixing chamber 24, respectively. A first stirring mechanism 18 is installed between the first chamber cover 10 and the first mixing chamber 23. A second stirring mechanism 19 is provided between the second bin cover 11 and the second mixing bin 24. A controller 12 is bolted to one side of the top of the second bin cover 11. A water inlet is provided on one side of the top of the first bin cover 10, and a third valve 16 is connected to the top of the water inlet via a flange. A second discharge pipe 9 is connected to the top of the third valve 16 via a flange. A first discharge pipe 6 is provided on one side of the second discharge pipe 9. A weighing storage bin 7 is provided on the top of the first discharge pipe 6, and a discharge metering device 8 is bolted to one side of the weighing storage bin 7. In this invention, the equipment occupies little space, has high information integration, and accurate measurement. All operations are completed by the controller, reducing manual input. The produced mixture is evenly dispersed, without fish eyes, and has good adhesion.

[0027] Based on the above, a water inlet hole is provided through one side of the water supply tank 2 near the top, and a first water inlet pipe 5 is connected to one side of the water inlet hole via a flange. A first valve 4 is connected to the bottom of the first water inlet pipe 5 via a flange, and a water inlet 3 is provided at the bottom of the first valve 4.

[0028] Based on the above, a water outlet is provided on one side of the second mixing chamber 24, and a mixed liquid discharge pipe 13 is fixed on the inner wall of the water outlet. One end of the mixed liquid discharge pipe 13 is located at the bottom of the second mixing chamber 24. A second flow meter 22 is provided on one side of the mixed liquid discharge pipe 13. A second valve 14 is connected to the bottom of the mixed liquid discharge pipe 13 through a flange. A mixed liquid outlet 15 is provided at the bottom of the second valve 14.

[0029] Based on the above, the sealing mechanism 17 consists of a turntable 26, a connecting rod 25 and a sealing plate 27. The top of the sealing plate 27 is connected to the bottom of the connecting rod 25 by bolts. A rotating hole is provided through the top of the communication port. The rotating hole and the connecting rod 25 are rotatably connected by a bearing. The top of the connecting rod 25 is welded to the bottom of the turntable 26.

[0030] Based on the above, the first stirring mechanism 18 consists of a first motor 28, a first rotating rod 29, a connecting sleeve 30, and two first stirring blades 31. The top of the first rotating rod 29 is rotatably connected to the first chamber cover 10 through a bearing. The top of the first chamber cover 10 is connected to the first motor 28 through bolts. One end of the first motor 28 is fixedly connected to the first rotating rod 29. The connecting sleeve 30 is fixedly sleeved on the outer wall of the first rotating rod 29. The two first stirring blades 31 are symmetrically fixed on the outer circumference of the connecting sleeve 30.

[0031] Based on the above, the second stirring mechanism 19 is composed of a second motor 43, a second rotating rod 44 and a plurality of second stirring blades 45. The top of the second rotating rod 44 is rotatably connected to the second chamber cover 11 through a bearing. The plurality of second stirring blades 45 are fixed at equal intervals above the outer circumference of the second rotating rod 44. The top of the second chamber cover 11 is connected to the second motor 43 through bolts. One end of the second motor 43 is fixedly connected to the second rotating rod 44.

[0032] Example 2, refer to Figures 1-7 A continuous mixing device for oilfield fracturing, compared with Embodiment 1, has a tumbling mechanism provided on one side of the first stirring mechanism 18, and the tumbling mechanism and the first stirring mechanism 18 cooperate with each other.

[0033] Based on the above, the stirring mechanism includes multiple support plates 39, multiple racks 40, a main shaft 32, a drive wheel 33, two auxiliary shafts 34, two driven wheels 35, two shafts 36, two support sleeves 37, and multiple stirring plates 38. The multiple support plates 39 are fixed in a ring at equal intervals at the bottom of the first mixing chamber 23. One side of each rack 40 is bolted to a support plate 39. The rack 40 is arc-shaped. A stirring inlet is provided through one side of the first stirring blade 31. Both ends of the main shaft 32 are rotatably connected to the stirring inlet via bearings. The drive wheel 33 is fixedly sleeved on the outer wall of the main shaft 32. A gear shaft 41 is welded to the bottom of the main shaft 32, and a gear 42 is fixedly sleeved on the outer wall of the gear shaft 41. The gear 42 meshes with the rack 40. The two auxiliary shafts 34 are connected to the stirring inlet via... A rotating connection is formed through bearings. Two driven wheels 35 are fixedly sleeved on the outer wall of the secondary shaft 34. The two driven wheels 35 mesh with the two sides of the driving wheel 33. One end of each of the two shafts 36 is welded to the two secondary shafts 34. The two shafts 36 are obliquely symmetrically distributed. A support sleeve 37 is fixedly sleeved on the outer wall of the shaft 36. Multiple stirring plates 38 are fixed at equal intervals on the circumferential outer wall of the support sleeve 37. The shafts 36 are lightning-shaped. Through the cooperation between the first stirring mechanism 18 and the tumbling mechanism, the material can be effectively stirred. The tumbling mechanism can stir the material deposited at the bottom of the first mixing chamber 23, preventing the material from being deposited at the bottom of the first mixing chamber 23 and thus preventing the material from being effectively stirred and mixed, thereby affecting the mixing effect of the material.

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A continuous mixing device for oilfield fracturing, comprising a mixing tank (1) and a water supply tank (2), characterized in that, The mixing tank (1) is equipped with a first mixing chamber (23) and a second mixing chamber (24) respectively. A connecting opening is provided between the first mixing chamber (23) and the second mixing chamber (24) at the bottom position on one side. A sealing mechanism (17) is provided inside the connecting opening. A second water inlet pipe (20) is provided between the first mixing chamber (23) and the water supply tank (2). A first flow meter (21) is provided on one side of the second water inlet pipe (20). One end of the second water inlet pipe (20) is located at the bottom of the water supply tank (2). The tops of the first mixing chamber (23) and the second mixing chamber (24) are respectively connected by bolts to a first chamber cover (10) and a second chamber cover (11). The first chamber cover (10) and the second chamber cover (11) are connected by bolts to the first chamber cover (10) and the second chamber cover (11). A first stirring mechanism (18) is provided between the first mixing bins (23), and a second stirring mechanism (19) is provided between the second bin cover (11) and the second mixing bin (24). A controller (12) is bolted to one side of the top of the second bin cover (11). A water inlet is provided on one side of the top of the first bin cover (10), and a third valve (16) is connected to the top of the water inlet via a flange. A second discharge pipe (9) is connected to the top of the third valve (16) via a flange. A first discharge pipe (6) is provided on one side of the second discharge pipe (9). A weighing storage bin (7) is provided on the top of the first discharge pipe (6), and a discharge meter (8) is bolted to one side of the weighing storage bin (7).

2. The continuous mixing device for oilfield fracturing according to claim 1, characterized in that, The water supply tank (2) has a water inlet hole on one side near the top, and a first water inlet pipe (5) is connected to one side of the water inlet hole via a flange. A first valve (4) is connected to the bottom of the first water inlet pipe (5) via a flange. A water inlet (3) is provided at the bottom of the first valve (4).

3. The continuous mixing device for oilfield fracturing according to claim 1, characterized in that, The second mixing chamber (24) has an outlet on one side, and a mixed liquid discharge pipe (13) is fixed on the inner wall of the outlet. One end of the mixed liquid discharge pipe (13) is located at the bottom of the second mixing chamber (24). A second flow meter (22) is installed on one side of the mixed liquid discharge pipe (13). A second valve (14) is connected to the bottom of the mixed liquid discharge pipe (13) through a flange. A mixed liquid outlet (15) is opened at the bottom of the second valve (14).

4. The continuous mixing device for oilfield fracturing according to claim 1, characterized in that, The sealing mechanism (17) consists of a turntable (26), a connecting rod (25) and a sealing plate (27). The top of the sealing plate (27) is connected to the bottom of the connecting rod (25) by bolts. A rotating hole is provided through the top of the communication port. The rotating hole and the connecting rod (25) are connected by a bearing. The top of the connecting rod (25) is welded to the bottom of the turntable (26).

5. A continuous mixing device for oilfield fracturing according to claim 1, characterized in that, The first stirring mechanism (18) consists of a first motor (28), a first rotating rod (29), a connecting sleeve (30), and two first stirring blades (31). The top of the first rotating rod (29) is rotatably connected to the first chamber cover (10) through a bearing. The top of the first chamber cover (10) is connected to the first motor (28) through bolts. One end of the first motor (28) is fixedly connected to the first rotating rod (29). The connecting sleeve (30) is fixedly sleeved on the outer wall of the first rotating rod (29). The two first stirring blades (31) are symmetrically fixed on the outer circumference of the connecting sleeve (30).

6. The continuous mixing device for oilfield fracturing according to claim 1, characterized in that, The second stirring mechanism (19) consists of a second motor (43), a second rotating rod (44) and a plurality of second stirring blades (45). The top of the second rotating rod (44) is rotatably connected to the second chamber cover (11) through a bearing. The plurality of second stirring blades (45) are fixed at equal intervals above the outer circumference of the second rotating rod (44). The top of the second chamber cover (11) is connected to the second motor (43) through bolts. One end of the second motor (43) is fixedly connected to the second rotating rod (44).

7. A continuous mixing device for oilfield fracturing according to claim 5, characterized in that, A tumbling mechanism is provided on one side of the first stirring mechanism (18), and the tumbling mechanism and the first stirring mechanism (18) cooperate with each other.

8. A continuous mixing device for oilfield fracturing according to claim 7, characterized in that, The stirring mechanism includes multiple support plates (39), multiple racks (40), a main shaft (32), a drive wheel (33), two auxiliary shafts (34), two driven wheels (35), two shafts (36), two support sleeves (37), and multiple stirring plates (38). The multiple support plates (39) are fixed in a ring at equal intervals at the bottom of the first mixing chamber (23). One side of the rack (40) is bolted to the support plate (39). The rack (40) is arc-shaped. A stirring port is opened through one side of the first stirring blade (31). The two ends of the main shaft (32) are rotatably connected to the stirring port through bearings. The drive wheel (33) is fixedly sleeved on the outer wall of the main shaft (32). The bottom of the main shaft (32) is... A gear shaft (41) is welded to the part, and a gear (42) is fixedly sleeved on the outer wall of the gear shaft (41). The gear (42) meshes with the rack (40). Two auxiliary shafts (34) are rotatably connected to the stirring port through bearings. Two driven wheels (35) are fixedly sleeved on the outer wall of the auxiliary shaft (34). The two driven wheels (35) mesh with the two sides of the driving wheel (33). One end of two shafts (36) is welded to the two auxiliary shafts (34) respectively. The two shafts (36) are obliquely symmetrically distributed. A support sleeve (37) is fixedly sleeved on the outer wall of the shaft (36). Multiple stirring plates (38) are fixed at equal distances on the circumferential outer wall of the support sleeve (37). The shaft (36) is lightning-shaped.

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