Combined stirring type fracturing fluid preparation reactor

Abstract

The utility model discloses a kind of combined stirring fracturing fluid preparation reaction kettle, belong to petroleum engineering test device technical field.The reaction kettle includes reaction tank body and is arranged in the stirring shaft of jar body, stirring shaft is rotated by top stirring motor through connecting device driving, shaft is provided with multiple stirrers.The stirrer includes axial flow stirrer and frame stirrer, staggered distribution, form coaxial asynchronous mixing structure, realize the alternate mixing of medium axial flow and radial flow, improve mixing efficiency and uniformity;The frame stirrer paddle is provided with aperture to enhance fluidity, the axial flow stirrer uses equal-angle distribution's oblique paddle blade.Reaction tank body is equipped with jacket control reaction kettle internal temperature, and is provided with viscosity sensor real-time monitoring liquid viscosity;Internal baffle can stabilize liquid level, effectively prevent uneven mixing.The reaction kettle structure optimization, mixing performance is excellent, suitable for the efficient preparation of high-viscosity fracturing fluid.

Description

Technical Field

[0001] This experimental application relates to the field of indoor petroleum engineering testing, specifically to a combined stirred fracturing fluid preparation reactor. Background Technology

[0002] In the process of continuous resource development and utilization in my country, the importance of unconventional energy in production and daily life is becoming increasingly prominent. Hydraulic fracturing technology, as a key technology for achieving large-scale and efficient development of unconventional oil and gas (including tight oil and gas, shale oil and gas, coalbed methane, etc.), low-permeability, and deep oil and gas resources, is of significant practical importance for ensuring a stable energy supply and safeguarding national strategic security. Its core mechanism is as follows: using a surface high-pressure pump unit, fracturing fluid is injected into the reservoir at a rate exceeding the reservoir's absorption capacity, creating a high-pressure environment within the wellbore that induces artificial fractures; subsequently, proppant-carrying fluid (containing proppant) is injected into the fractures to support them, thereby constructing multiple high-conductivity channels to provide pathways for oil and gas migration, ultimately achieving the goal of increased production and injection. In this process, fracturing fluid, as an indispensable chemical working fluid in fracturing and production enhancement operations, has a decisive impact on the effectiveness of oil and gas reservoir stimulation and recovery rates.

[0003] Fracturing fluid is typically a viscous solid-liquid mixture consisting of a liquid phase, a solid phase (including particulate matter such as sand and gravel), and chemical substances. However, most existing traditional fracturing fluid agitation equipment uses a single-shaft, single-blade structure. When dealing with high-viscosity fracturing fluids, the main circulating flow generated by the widely used axial-flow agitator tends to shift to radial flow, leading to a decrease in solid suspension performance. This not only hinders effective liquid transfer but also causes insufficient solid-liquid mixing, thus affecting the overall performance of the fracturing fluid. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a combined stirring type fracturing fluid preparation reactor.

[0005] A combined stirring fracturing fluid preparation reactor is characterized by comprising a reaction tank and a stirring shaft disposed within the reaction tank. A stirring motor is provided at the top of the reaction tank and drives the stirring shaft to rotate via a connecting device. The stirring shaft is respectively equipped with a frame-type stirrer and multiple axial flow stirrers, and the frame-type stirrer has multiple radial stirring blades that are staggered with the axial flow stirrers to mix the raw materials.

[0006] A viscosity sensor is provided in the middle of the reaction tank. A heat transfer oil inlet is provided on the left side of the reaction tank to inject heat transfer oil into the jacket. A heat transfer oil outlet and a discharge port are provided at the bottom of the reaction tank, with the heat transfer oil outlet on the right side of the discharge port. A rectangular baffle extending axially is fixedly connected to the inner wall of the right side of the reaction tank.

[0007] Preferably, a reducer is connected to the bottom of the stirring motor, and the bottom of the reducer is fixed to the frame. The transmission device and the stirring shaft are fixedly connected by a coupling, and an upper end cap is fixedly connected to the bottom of the frame.

[0008] Preferably, the upper end cap is fixedly connected to the reaction vessel body by fixing screws, the stirring shaft extends through the upper end cap into the interior of the reaction vessel body, the upper end cap is fixedly connected to the top of the reaction vessel body, the upper end cap is provided with a maintenance manhole and a feed inlet, and the maintenance manhole is located to the left of the feed inlet. A pressure sensor is also provided above the upper end cap.

[0009] Preferably, the curvature of the bottom blades of the frame agitator is the same as the curvature of the bottom end cap of the reaction vessel, and the agitator shaft is a solid shaft.

[0010] Preferably, the axial flow agitator may include three or more inclined blades, and the included angle between two adjacent blades is the same.

[0011] Preferably, the impeller blades of the frame agitator are straight blades with a rectangular hole in the middle, and the opening area accounts for 1 / 2 of the total blade area. The axial flow agitator has inclined blades, and the angle between the blade length direction and the horizontal plane is 45°. The frame agitator and the axial flow agitator form a coaxial asynchronous frame agitator.

[0012] The combined stirred fracturing fluid preparation reactor provided by this invention has the following beneficial effects:

[0013] 1. The reactor is equipped with an axial flow agitator and a frame-type radial flow agitator, so that the medium flowing continuously inside the reactor can alternate between axial flow and radial flow. Through the repeated action of the two flow states, the medium is fully mixed, effectively improving the mixing effect and mixing uniformity.

[0014] 2. The reaction vessel provided by this utility model achieves precise temperature control of the reaction system through a jacketed structure and combines a viscosity sensor to monitor the viscosity of the fracturing fluid in real time, thereby enabling the fracturing fluid to quickly reach and maintain a stable viscosity range. Simultaneously, the baffle structure inside the reaction vessel effectively maintains the stability of the material surface within the vessel, preventing uneven mixing caused by surface fluctuations, thus significantly improving product quality. Furthermore, the reaction vessel's optimized outlet channel ensures smooth material discharge, effectively improving the convenience and efficiency of production operations. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the combined stirred fracturing fluid preparation reactor;

[0016] Figure 2 is a side cross-sectional view of the present invention;

[0017] Figure 3 is a schematic diagram of the axial flow agitator.

[0018] In the diagram: 1-Stirring motor, 2-Reducer, 3-Coupling, 4-Frame, 5-Upper head, 6-Reaction tank, 7-Inlet, 8-Manhole, 9-Pressure sensor, 10-Fixing screw, 11-Heat transfer oil inlet, 12-Heat transfer oil outlet, 13-Discharge port, 14-Jacket, 15-Stirring shaft, 16-Baffle, 17-Axial flow stirrer, 18-Frame stirrer, 19-Connecting device, 20-Inclined blade, 21-Viscosity sensor. Detailed Implementation

[0019] To more clearly and completely elucidate the invention's purpose, technical solution, and significant advantages, the present invention will now be explained and described in detail based on the accompanying drawings and specific embodiments.

[0020] Please refer to Figures 1 to 3. This embodiment of the present invention provides a combined stirred fracturing fluid preparation reactor, including a reaction tank (6) and a stirring shaft (15) disposed within the reaction tank (6). A stirring motor (1) is located at the top to drive the stirring shaft (15) to rotate. The reaction tank (6) is a vertical reactor. A viscosity sensor (21) is located in the middle of the reaction tank (6). A heat transfer oil inlet (11) is located on the left side of the reaction tank (6) to inject heat transfer oil into the jacket (14). The heat transfer oil is discharged through the heat transfer oil outlet (12). A discharge port (13) is located at the bottom of the reaction tank (6). After the material has fully reacted, it is discharged through the discharge port (13), and the heat transfer oil outlet (12) is on the right side of the discharge port (13). A rectangular baffle (16) extending along the axial direction is fixedly connected to the inner wall of the right side of the reaction tank (6). The reaction vessel achieves precise control of the temperature of the reaction system through the jacket structure, and combines the viscosity sensor to monitor the viscosity of the fracturing fluid in real time, thereby prompting the fracturing fluid to quickly reach the predetermined viscosity range and remain stable. The baffle structure can effectively maintain the stability of the material liquid surface in the cylinder, prevent uneven mixing of materials due to liquid surface fluctuations, and thus significantly improve product quality.

[0021] The top of the reaction vessel (6) is fixedly connected to the upper head (5) by fixing screws (10). The upper head (5) is provided with a maintenance manhole (8) and a feed inlet (7), and the maintenance manhole (8) is located to the left of the feed inlet (7). A pressure sensor (9) is also provided above the upper head (5) to dynamically and continuously monitor the internal pressure of the reaction vessel.

[0022] The bottom of the stirring motor (1) is connected to a reducer (2). The reducer (2) adopts an existing planetary reducer. The bottom of the reducer (2) is fixed to the frame (4). The frame (4) is bolted to the top of the upper end cap (5). The transmission device is fixedly connected to the stirring shaft (15) through a coupling (3), so that the output end of the reducer (2) can be connected to the stirring shaft and drive it to rotate. The coupling (3) adopts a claw coupling. In other embodiments of this utility model, a drum-shaped gear coupling and a flange coupling can also be used. The bearing capacity is large and the operation is reliable.

[0023] Multiple agitators are provided on the stirring shaft (15) to mix the raw materials. The curvature of the bottom blade of the frame agitator (18) is the same as the curvature of the bottom end cap of the reaction tank (6). The agitator blade of the frame agitator (18) is a straight blade with a rectangular hole in the middle. The opening area accounts for 1 / 2 of the total blade area. Compared with the traditional straight blade without opening, the technical solution involved in this utility model embodiment, combined with the axial flow agitator, can achieve a more efficient and uniform mixing effect on the raw materials. It shows significant technical advantages in key performance indicators such as material mixing efficiency and mixing uniformity. The axial flow agitator (17) can include three or more inclined blades (20), and the included angle between two adjacent blades is the same. The included angle between the blade length direction and the horizontal plane is 45°. In this utility model embodiment, the frame agitator (18) and the axial flow agitator (17) are snapped to the outer wall of the stirring shaft (15). The snap-fit ​​connection facilitates installation and disassembly. The frame agitator (18) and the axial flow agitator (17) form a coaxial asynchronous frame agitator, and the frame agitator (18) has multiple radial stirring blades that are staggered with the axial flow agitator (17).

[0024] It should be noted that during the actual implementation process, the operator puts the raw materials into the reactor and then starts the stirring motor (1), which drives the stirring shaft (15) to rotate. Since the frame stirrer (18) and the axial flow stirrer (17) are connected to the stirring shaft (15) by a snap-fit ​​connection, they will rotate synchronously with the stirring shaft (15), thereby causing the medium in the reactor, which is in a continuous flow state, to alternately present two flow states: axial flow and radial flow. Through the synergistic and repeated action of these two flow states, the medium is fully and uniformly mixed.

[0025] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit the scope of patent protection of this utility model. Any equivalent structural transformations, equivalent process changes, or technical solutions directly or indirectly applied to other related technical fields based on the content of this utility model specification and drawings should be included within the scope of patent protection of this utility model.

Claims

1. A combined stirred fracturing fluid preparation reactor, characterized in that... The reaction vessel includes a reaction tank (6) and a stirring shaft (15) installed in the reaction tank (6). The top of the reaction tank (6) is equipped with a stirring motor (1) which drives the stirring shaft (15) to rotate through a connecting device (19). The stirring shaft (15) is equipped with a frame stirrer (18) and multiple axial flow stirrers (17). The frame stirrer (18) has multiple radial stirring blades that are staggered with the axial flow stirrers (17) to mix the raw materials. A viscosity sensor (21) is provided in the middle of the reaction tank (6). A heat transfer oil inlet (11) is provided on the left side of the reaction tank (6) to inject heat transfer oil into the jacket (14). A heat transfer oil outlet (12) and a discharge port (13) are provided at the bottom of the reaction tank (6), and the heat transfer oil outlet (12) is on the right side of the discharge port (13). A rectangular baffle (16) extending axially is fixedly connected to the inner wall of the right side of the reaction tank (6).

2. The combined stirred fracturing fluid preparation reactor according to claim 1, characterized in that: The bottom of the stirring motor (1) is connected to a reducer (2), the bottom of the reducer (2) is fixed to the frame (4), and the transmission device is fixedly connected to the stirring shaft (15) through a coupling (3). The bottom of the frame (4) is fixedly connected to an upper end cap (5).

3. The combined stirred fracturing fluid preparation reactor according to claim 2, characterized in that: The upper end cap (5) is fixedly connected to the reaction vessel body (6) by fixing screws (10). The stirring shaft (15) extends through the upper end cap (5) into the interior of the reaction vessel body (6). The top of the reaction vessel body (6) is fixedly connected to the upper end cap (5). The upper end cap (5) is provided with a maintenance manhole (8) and a feed inlet (7). The maintenance manhole (8) is located to the left of the feed inlet (7). A pressure sensor (9) is also provided above the upper end cap (5).

4. The combined stirred fracturing fluid preparation reactor according to claim 1, characterized in that: The curvature of the bottom blades of the frame stirrer (18) is the same as the curvature of the bottom end cap of the reaction vessel (6), and the stirring shaft (15) is a solid shaft.

5. The combined stirred fracturing fluid preparation reactor according to claim 1, characterized in that: The axial flow agitator (17) may include three or more inclined blades (20), and the included angle between two adjacent blades is the same.

6. The combined stirred fracturing fluid preparation reactor according to claim 5, characterized in that: The frame agitator (18) has straight blades with a rectangular hole in the middle, and the opening area accounts for 1 / 2 of the total blade area. The axial flow agitator (17) has oblique blades, and the angle between the blade length direction and the horizontal plane is 45°. The frame agitator (18) and the axial flow agitator (17) form a coaxial asynchronous frame agitator.

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