A negative pressure mixer for powder-liquid mixing and a method of use

Abstract

The application discloses a kind of negative pressure mixers for powder liquid mixing and use method, belong to petroleum, natural gas fracturing equipment technical field, including injection pipeline, injection pipeline is equipped with power outlet and powder liquid mixing import in sequence, power outlet is equipped with power pipeline, power pipeline is equipped with ball valve, power pipeline other end is connected with mixing member, mixing member includes mixing main body, mixing main body side wall is equipped with feed pipe, feed pipe one end is connected with power pipeline, feed pipe is connected with mixing pipe, mixing main body upper end is connected with negative pressure part, powder inlet valve and powder inlet pipe, mixing main body lower end is connected by powder liquid mixing pipe and powder liquid mixing import.The powder will be under the action of self-weight and negative pressure part, all fall into mixing member;At this time, power liquid flow rate is accelerated after venturi effect, shear effect is generated to powder, promote powder hydration, and finally powder liquid mixture enters into injection pipeline.

Description

Technical Field

[0001] This invention belongs to the technical field of oil and gas fracturing equipment, specifically relating to a negative pressure mixer for powder-liquid mixing and its usage method. Background Technology

[0002] As the scale of unconventional oil and gas development projects in China gradually increases, fracturing is a key technology in this field. Fracturing is also an important measure for enhancing secondary oil recovery in oilfields. The success of fracturing operations largely depends on the quality of the fracturing fluid. A crucial way to improve fracturing fluid quality is to achieve on-site preparation and compression, thereby improving the hydration effect and addressing issues such as uneven mixing of fracturing fluid and low, uneven viscosity.

[0003] Chinese patent CN211562540U, published on September 25, 2020, discloses a jet mixer for fracturing fluid mixing. Its main structure includes an intake conduit, a swirling nozzle, a mixing chamber, a diffusion conduit, a flushing pipeline, and a mixing aid chamber. The swirling nozzle is connected to the intake conduit and positioned at the inlet end of the mixing chamber. The outlet end of the mixing chamber is connected to the diffusion conduit, and the upper part of the mixing chamber is connected to the mixing aid chamber. The diffusion conduit is connected to the flushing pipeline. The flushing pipeline is connected to the mixing aid chamber via a throttling fitting and a ball valve. A feed connector is provided at the top of the mixing aid chamber. The flushing pipeline guides the flushing water flow and the powder fed through the feed connector to mix in the mixing aid chamber. The patent has the following problems: (1) The flushing pipe, throttling pipe, ball valve, transition pipe and connecting pipe are easy to get clogged; (2) When the pressure is unstable, the water in the suction pipe is easy to backflow into the powder system; (3) When the water flow rate in the suction pipe is too low, too much powder under the feed joint is easy to clog the diffusion cone; (4) The swirling nozzle generates a swirling flow, but the flow rate does not change. Due to friction, the flow rate is reduced. The function is to flush the powder off the pipe wall as much as possible. High-speed fluid will be generated after the diffusion cone. However, before the diffusion cone, the base liquid is mixed with the powder, which has the disadvantage of poor mixing effect. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a negative pressure mixer for powder-liquid mixing and a method of use. After the liquid in the energizing pipe enters the mixing component, a negative pressure zone is formed in the negative pressure part above the mixing component. After the negative pressure stabilizes, this negative pressure zone can ensure that the base liquid in the spraying pipe cannot enter the mixer. At this time, the feed valve is opened, and the powder will fall into the mixing component under the dual action of its own weight and the negative pressure part. At this time, the energizing liquid has a faster flow rate after the Venturi effect, which generates a shearing effect on the powder and promotes the hydration of the powder. Finally, the powder-liquid mixture enters the spraying pipe.

[0005] The objective of this invention is achieved through the following technical solution: A negative pressure mixer for powder-liquid mixing includes a spray pipe with an energizing outlet and a powder-liquid mixing inlet sequentially arranged on it. An energizing pipe is provided at the energizing outlet, and a ball valve is provided on the energizing pipe. The other end of the energizing pipe is connected to a mixing component. The mixing component includes a mixing body, and a feed pipe is provided on the side wall of the mixing body. One end of the feed pipe is connected to the energizing pipe. The feed pipe and the mixing pipe provided on the inner wall of the mixing body form an arc-shaped channel after assembly. The upper end of the mixing body is sequentially connected to a negative pressure section, a powder inlet valve, and a powder inlet pipe. The lower end of the mixing body is connected to the powder-liquid mixing inlet through a powder-liquid mixing pipe.

[0006] Preferably, the feed pipe is disposed on the periphery of the mixing body along the tangent direction of the arc.

[0007] Preferably, the cross-section of the mixing pipe is a circular conical tube.

[0008] Preferably, the mixing tube is larger at one end and smaller at the other.

[0009] Preferably, the energizing pipe includes an energizing vertical pipe, an energizing bend, and an energizing horizontal pipe connected in sequence.

[0010] Preferably, the energized bend is equipped with a pressure sensor.

[0011] Preferably, the injection pipe is horizontally arranged.

[0012] Preferably, both the energizing vertical pipe and the powder-liquid mixing pipe are arranged perpendicularly to the spraying pipe.

[0013] Preferably, the powder inlet valve is a remote-controlled butterfly valve.

[0014] A method of using a negative pressure mixer for mixing powder and liquid includes the following steps: Step 1: The ball valve on the energizing horizontal pipe is normally open. After the liquid flows into the injection pipe, the fluid will also flow into the mixer through the energizing pipe. Step 2: The pressure sensor transmits the fluid pressure value of the energizing pipeline to the controller. When the fluid pressure value of the energizing pipeline reaches the set value, the controller controls the powder inlet valve to open, and at the same time, it links the powder conveying system to transport the powder to the powder inlet pipe. Under the dual action of its own weight and the negative pressure of the mixer, the powder enters the mixer. Step 3: When the powder comes into contact with the high-pressure jet fluid output from the mixing pipe, it will be sheared, achieving powder-liquid mixing, and then flushed into the jet pipe, entering the next process with the jet fluid.

[0015] Preferably, in step two, the set value is 0.4 MPa.

[0016] Preferably, when it is necessary to stop the mixing operation, the powder conveying system and the powder inlet valve should be shut off first, and then the fluid in the injection pipe should be cut off.

[0017] The beneficial effects of this technical solution are as follows: I. The present invention provides a negative pressure mixer for powder-liquid mixing. After the liquid in the energizing pipe enters the mixing component, a negative pressure zone is formed in the negative pressure part above the mixing component. After the negative pressure stabilizes, this negative pressure zone can ensure that the base liquid in the spray pipe cannot enter the mixer. At this time, the feed valve is opened, and the powder will fall into the mixing component under the dual action of its own weight and the negative pressure part. At this time, the energizing liquid has a faster flow rate after the Venturi effect, which generates a shearing effect on the powder and promotes the hydration of the powder. Finally, the powder-liquid mixture enters the spray pipe.

[0018] II. The present invention provides a negative pressure mixer for mixing powder and liquid. The feed pipe is set on the periphery of the mixing body along the tangent of the arc. The mixing pipe is arc-shaped and has one end larger than the other, so that the liquid in the energizing pipe can enter the interior of the mixing body better, so that the negative pressure part forms a stable negative pressure zone.

[0019] Third, the negative pressure mixer provided by this invention for powder-liquid mixing can operate stably as long as there is a low discharge rate, so that the pressure of the energizing pipeline reaches above 0.4MPa. The mixer effect can always ensure the impact of high pressure on the powder during mixing, so as to achieve a good mixing effect.

[0020] IV. The present invention provides a negative pressure mixer for powder-liquid mixing, which has high mixing capacity and can ensure that fracturing fluid is mixed and pressurized on site.

[0021] V. The present invention provides a negative pressure mixer for mixing powder and liquid. The negative pressure function of the mixer ensures that the base liquid does not backflow into the mixer, thereby improving the stability of construction. VI. The present invention provides a negative pressure mixer for mixing powder and liquid. The negative pressure suction ensures the complete intake of powder, and the mixing process is leak-free, reducing the risk of environmental pollution. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a perspective view of the present invention; Figure 3 The principle of this invention Figure 1 ; Figure 4 The principle of this invention Figure 2 ; Figure 5 This is a schematic diagram of the mixing component in this invention; The components are as follows: 1. Injection pipe; 11. Energizing outlet; 12. Powder-liquid mixing inlet; 2. Energizing pipe; 21. Energizing vertical pipe; 22. Energizing bend; 23. Energizing horizontal pipe; 24. Ball valve; 3. Mixing component; 31. Mixing body; 32. Feed pipe; 33. Mixing pipe; 4. Negative pressure section; 5. Powder inlet valve; 6. Powder inlet pipe; 7. Powder-liquid mixing pipe. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto.

[0024] Example 1 like Figures 1-5 As shown, a negative pressure mixer for powder-liquid mixing includes a spray pipe 1, on which an energizing outlet 11 and a powder-liquid mixing inlet 12 are sequentially arranged. An energizing pipe 2 is arranged at the energizing outlet 11, and a ball valve 24 is arranged on the energizing pipe 2. The other end of the energizing pipe 2 is connected to a mixing component 3. The mixing component 3 includes a mixing body 31, on which a feed pipe 32 is arranged on the side wall. One end of the feed pipe 32 is connected to the energizing pipe 2. The feed pipe 32 and the mixing pipe 33 arranged on the inner wall of the mixing body 31 form an arc channel. The upper end of the mixing body 31 is sequentially connected to a negative pressure section 4, a powder inlet valve 5, and a powder inlet pipe 6. The lower end of the mixing body 31 is connected to the powder-liquid mixing inlet 12 through a powder-liquid mixing pipe 7.

[0025] Example 2 A negative pressure mixer for powder-liquid mixing includes a spray pipe 1, on which an energizing outlet 11 and a powder-liquid mixing inlet 12 are sequentially arranged. An energizing pipe 2 is arranged at the energizing outlet 11, and a ball valve 24 is arranged on the energizing pipe 2. The other end of the energizing pipe 2 is connected to a mixing component 3. The mixing component 3 includes a mixing body 31, and a feed pipe 32 is arranged on the side wall of the mixing body 31. One end of the feed pipe 32 is connected to the energizing pipe 2. The feed pipe 32 and the mixing pipe 33 arranged on the inner wall of the mixing body 31 form an arc channel. The upper end of the mixing body 31 is sequentially connected to a negative pressure section 4, a powder inlet valve 5, and a powder inlet pipe 6. The lower end of the mixing body 31 is connected to the powder-liquid mixing inlet 12 through a powder-liquid mixing pipe 7.

[0026] The feed pipe 32 is located on the periphery of the mixing body 31 along the tangent direction of the arc.

[0027] The water flow cross-section of the mixing pipe 33 is a circular conical tube.

[0028] The mixing pipe 33 is wider at one end than the other. The end closer to the feed inlet is wider than the end further away from the feed inlet.

[0029] The energizing pipe 2 includes an energizing vertical pipe 21, an energizing bend pipe 22, and an energizing horizontal pipe 23 connected in sequence.

[0030] The ball valve 24 is mounted on the energizing horizontal pipe 23.

[0031] The energized bend 22 is equipped with a pressure sensor.

[0032] The injection pipe 1 is horizontally arranged.

[0033] The energizing vertical pipe 21 and the powder-liquid mixing pipe 7 are both arranged perpendicularly to the spray pipe 1.

[0034] The powder inlet valve 5 is a remote-controlled butterfly valve.

[0035] The beneficial effects of this technical solution are as follows: I. The present invention provides a negative pressure mixer for powder-liquid mixing. After the liquid in the energizing pipe 2 enters the mixing component 3, a negative pressure zone is formed in the negative pressure part 4 above the mixing component 3. After the negative pressure stabilizes, this negative pressure zone can ensure that the base liquid in the spray pipe 1 cannot enter the mixer. At this time, the feed valve is opened, and the powder will fall into the mixing component 3 under the dual action of its own weight and the negative pressure part 4. At this time, the energizing liquid has a faster flow rate after the Venturi effect, which generates a shearing effect on the powder and promotes the hydration of the powder. Finally, the powder-liquid mixture enters the spray pipe 1.

[0036] II. The present invention provides a negative pressure mixer for mixing powder and liquid. The feed pipe 32 is set on the periphery of the mixing body 31 along the tangent of the arc. The mixing pipe 33 is arc-shaped and has one end larger than the other, so that the liquid in the energizing pipe 2 can enter the mixing body 31 better, so that the negative pressure part 4 forms a stable negative pressure zone.

[0037] Third, the present invention provides a negative pressure mixer for powder-liquid mixing. Regardless of the working flow rate of the spray pipe 1, as long as there is a low discharge rate, the pressure of the energizing pipe 2 can reach above 0.4MPa, the mixer can work stably. The mixer effect can always ensure the impact of high pressure on the powder during mixing, so as to achieve a good mixing effect.

[0038] IV. The present invention provides a negative pressure mixer for powder-liquid mixing, which has high mixing capacity and can ensure that fracturing fluid is mixed and pressurized on site.

[0039] V. The present invention provides a negative pressure mixer for mixing powder and liquid. The negative pressure function of the mixer ensures that the base liquid does not backflow into the mixer, thereby improving the stability of construction. VI. The present invention provides a negative pressure mixer for mixing powder and liquid. The negative pressure suction ensures the complete intake of powder, and the mixing process is leak-free, reducing the risk of environmental pollution.

[0040] Example 3 This embodiment uses a negative pressure mixer for powder-liquid mixing as described in Embodiment 2, including the following steps: Includes the following steps: Step 1: The ball valve 24 on the energizing horizontal pipe 23 is normally open. After the liquid flows into the injection pipe 1, the fluid will also flow into the mixer through the energizing pipe 2. Step 2: The pressure sensor transmits the fluid pressure value of the energizing pipe 2 to the controller. When the fluid pressure value of the energizing pipe 2 reaches the set value, the controller controls the powder inlet valve 5 to open, and at the same time, the powder conveying system is linked to convey the powder to the powder inlet pipe 6. Under the dual action of its own weight and the negative pressure of the mixer, the powder enters the mixer. Step 3: When the powder comes into contact with the high-pressure jet fluid output from the mixing pipe 33, it will be sheared to achieve powder-liquid mixing and will be flushed into the jet pipe, entering the next process with the jet pipe fluid.

[0041] Preferably, in step two, the set value is 0.4 MPa.

[0042] Preferably, when it is necessary to stop the mixing operation, the powder conveying system and the powder inlet valve 5 should be shut off first, and then the fluid in the injection pipe should be cut off.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A negative pressure mixer for mixing powder and liquid, characterized in that: The system includes a spray pipe (1), which is provided with an energizing outlet (11) and a powder-liquid mixing inlet (12) in sequence. An energizing pipe (2) is provided at the energizing outlet (11), and a ball valve (24) is provided on the energizing pipe (2). The other end of the energizing pipe (2) is connected to a mixing component (3). The mixing component (3) includes a mixing body (31), which is provided with a feed pipe (32) on the side wall. One end of the feed pipe (32) is connected to the energizing pipe (2). The feed pipe (32) and the mixing pipe (33) provided on the inner wall of the mixing body (31) have an arc channel after being assembled. The upper end of the mixing body (31) is connected to a negative pressure part (4), a powder inlet valve (5), and a powder inlet pipe (6) in sequence. The lower end of the mixing body (31) is connected to the powder-liquid mixing inlet (12) through a powder-liquid mixing pipe (7).

2. The negative pressure mixer for mixing powder and liquid according to claim 1, characterized in that: The feed pipe (32) is located on the periphery of the mixing body (31) along the tangential direction of the arc.

3. A negative pressure mixer for mixing powder and liquid according to claim 2, characterized in that: The water flow cross section of the mixing pipe (33) is a circular conical tube.

4. A negative pressure mixer for mixing powder and liquid according to claim 3, characterized in that: The mixing tube (33) is larger at one end and smaller at the other.

5. A negative pressure mixer for mixing powder and liquid according to claim 4, characterized in that: The energizing pipe (2) includes an energizing vertical pipe (21), an energizing bend (22), and an energizing horizontal pipe (23) connected in sequence.

6. A negative pressure mixer for mixing powder and liquid according to claim 5, characterized in that: The ball valve (24) is mounted on the energizing horizontal pipe (23).

7. A negative pressure mixer for mixing powder and liquid according to claim 6, characterized in that: The power bend (22) is equipped with a pressure sensor.

8. A negative pressure mixer for mixing powder and liquid according to claim 7, characterized in that: The injection pipe (1) is set horizontally.

9. A negative pressure mixer for mixing powder and liquid according to claim 8, characterized in that: The empowering vertical pipe (21) and the powder-liquid mixing pipe (7) are both set perpendicular to the spray pipe (1).

10. A negative pressure mixer for mixing powder and liquid according to claim 9, characterized in that: The powder inlet valve (5) is a remote-controlled butterfly valve.

11. A method of using a negative pressure mixer for mixing powder and liquid, characterized in that, Includes the following steps: Step 1: The ball valve (24) on the energizing horizontal pipe (23) is normally open. After the liquid flows into the injection pipe (1), the fluid will also flow into the mixer through the energizing pipe (2). Step 2: The pressure sensor transmits the fluid pressure value of the energizing pipe (2) to the controller. When the fluid pressure value of the energizing pipe (2) reaches the set value, the controller controls the powder inlet valve (5) to open and simultaneously links the powder conveying system to convey the powder to the powder inlet pipe (6). Under the dual action of its own weight and the negative pressure of the mixer, the powder enters the mixer. Step 3: When the powder comes into contact with the high-pressure jet fluid output from the mixing pipe (33), it will be sheared to achieve powder-liquid mixing and be flushed into the jet pipe, and enter the next process with the jet pipe fluid.

12. The method of using a negative pressure mixer for mixing powder and liquid according to claim 11, characterized in that: In step two, the set value is 0.4 MPa.

13. A method of using a negative pressure mixer for mixing powder and liquid according to claim 12, characterized in that: It also includes shutting off the powder conveying system and the powder inlet valve (5) first when it is necessary to stop the mixing operation, and then cutting off the fluid in the injection pipe.

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