Negative-pressure controllable dry powder variable-viscosity fracturing fluid mixing device

Abstract

A negative pressure controllable dry powder variable-viscosity fracturing fluid mixing device relates to the technical field of petroleum engineering equipment and comprises a powder hopper, a negative pressure pipe, a jet pipe, a primary mixing tank and a defoaming tank, the bottom of the powder hopper can be communicated with the negative pressure pipe, the negative pressure pipe serving as a branch is connected with the jet pipe, one end of the jet pipe is connected to a fracturing fluid source, the other end of the jet pipe is connected with the primary mixing tank, and the defoaming tank is connected with the primary mixing tank. A stirring system is arranged in the primary mixing tank, a defoaming partition plate for completely dividing the internal space of the defoaming tank into two parts is arranged in the defoaming tank connected with the primary mixing tank, a plurality of groups of through holes communicated with the two parts are formed in the defoaming partition plate, and a bubble guide pipe communicated with the part where the liquid inlet is located is arranged at the top of the defoaming tank; a bubble containing cavity is formed in the top of the bubble guide pipe, and a liquid outlet communicated with the part not connected with the liquid inlet is further formed in the bubble removing tank. According to the utility model, high-stability bubbles generated by the influence of polymers in the variable-viscosity fracturing fluid can be effectively removed, and the preparation effect of the variable-viscosity fracturing fluid is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum engineering equipment, in particular to a negative pressure controllable dry powder variable viscosity fracturing fluid mixing device. Background Art

[0002] Fracturing construction is one of the common ways to transform oil and gas layers. A large amount of fracturing fluid is required during each construction process. The preparation effect is related to the success and effect of fracturing construction. Among them, slippery water fracturing fluid with drag reducing agent as the main auxiliary agent is widely used in the development of complex oil reservoirs. Its viscosity can be controlled by adjusting the ratio. It can be flexibly used for different types of complex formations and plays a dominant role in unconventional oil and gas production. During construction, variable viscosity fracturing fluid is usually prepared on-site by large displacement fluid. For slippery water fracturing fluid composed of dry powder, in order to avoid uneven mixing and fisheye agglomeration during feeding, it is usually prepared by directly inhaling dry powder under negative pressure. During the preparation process, it is easy to mix some air into the dry powder. When the dry powder is inhaled, this part of air will be introduced into the fracturing fluid, resulting in more bubbles in the pipeline. There are often more polymers in slippery water, which makes the surface viscosity of the bubbles larger, thereby improving the stability of the bubbles, making it difficult to eliminate them naturally from the fracturing fluid, affecting the preparation effect of the fracturing fluid. Utility Model Content

[0003] In view of this, the utility model proposes a negative pressure controllable dry powder variable viscosity fracturing fluid mixing device, which can remove bubbles introduced during the preparation of variable viscosity fracturing fluid by negative pressure dry powder, and ensure the preparation effect of variable viscosity fracturing fluid.

[0004] The utility model discloses a negative pressure controllable dry powder variable viscosity fracturing fluid mixing device, comprising a powder hopper, a negative pressure tube, a jet tube, a primary mixing tank and a defoaming tank, wherein the bottom of the powder hopper can be connected to the negative pressure tube, the negative pressure tube is connected to the jet tube as a branch, one end of the jet tube is connected to a fracturing fluid source, and the other end is connected to the primary mixing tank, a mixing blade is arranged in the primary mixing tank, the mixing blade is connected to an output end of a driving motor arranged on the surface of the primary mixing tank, the primary mixing tank is connected to the defoaming tank, a defoaming partition is arranged in the defoaming tank for completely dividing the internal space of the defoaming tank into two parts, a plurality of groups of through holes connecting the two parts are arranged on the defoaming partition, a bubble conduit connecting to the part where the liquid inlet is located is vertically arranged on the top of the defoaming tank, a bubble containing cavity is arranged on the top of the bubble conduit, and a liquid outlet of the part not connected to the liquid inlet is arranged on the defoaming tank.

[0005] One implementation manner of the utility model is that a delivery pump is arranged on the connecting pipeline between the primary mixing tank and the defoaming tank.

[0006] An implementation manner of the utility model is that the debubble baffle is vertically arranged in the debubble tank.

[0007] Furthermore, the vertical position of the through hole on the debubble baffle is not higher than the middle of the debubble tank.

[0008] Furthermore, the vertical position of the liquid inlet of the debubble tank is higher than the through hole on the debubble baffle.

[0009] The technical effects of the utility model are:

[0010] The utility model is provided with a defoaming tank for removing bubbles introduced during the preparation of negative pressure dry powder, which can effectively remove high-stability bubbles generated by the influence of polymer in the variable viscosity fracturing fluid, improve the uniformity of fracturing fluid dispersion, and ensure the preparation effect of the variable viscosity fracturing fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 It is an overall schematic diagram of the utility model;

[0013] In the figure: 1-powder hopper, 2-negative pressure pipe, 3-jet pipe, 4-primary mixing tank, 5-driving motor, 6-mixing blade, 7-delivery pump, 8-defoaming tank, 9-defoaming baffle, 10-bubble duct, 11-bubble containing cavity, 12-liquid outlet. DETAILED DESCRIPTION

[0014] The present invention will be further described in detail below in conjunction with the embodiments and drawings.

[0015] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0016] Example:

[0017] See also Figure 1 , a negative pressure controllable dry powder variable viscosity fracturing fluid mixing device,

[0018] The utility model comprises a powder hopper 1, a negative pressure pipe 2, a jet pipe 3, a primary mixing tank 4 and a defoaming tank 8. The powder hopper 1 is used for introducing powdered raw materials into the device, wherein the bottom of the powder hopper 1 can be connected with the negative pressure pipe 2, and the connection between the two is controlled by a conventional ball valve. The negative pressure pipe 2 is connected with the jet pipe 3 as a branch, one end of the jet pipe 3 is connected with the liquid source of the fracturing fluid, and the other end is connected with the primary mixing tank 4. When the fracturing fluid is prepared, the liquid in the liquid source is pressurized and enters the jet pipe 3, and a high-speed jet directed to the mixing pipe 4 is formed in the jet pipe 3, thereby generating a negative pressure condition in the negative pressure pipe 2. Here, the valve is adjusted to connect the two, so that the powder in the powder hopper 1 can be sucked into the high-speed fluid in the jet pipe 3. Compared with directly pouring the powder into the fluid, less powder is sucked in per unit time, so that the distribution is more uniform, which can effectively avoid the appearance of fish eyes.

[0019] A mixing blade 6 is provided in the primary mixing tank 4, and the mixing blade 6 is connected to the output end of a driving motor 5 provided on the surface of the primary mixing tank 4. The fracturing fluid jet after sucking in the powder continues to enter the mixing tank 4 and is stirred by the mixing blade 6. On the one hand, the powder is further evenly distributed, and on the other hand, some bubbles are eliminated by stirring to reduce the number of bubbles.

[0020] The primary mixing tank 4 is connected to the debubble tank 8, and a debubble partition 9 is provided in the debubble tank 8 to completely divide the internal space of the debubble tank 8 into two parts. A plurality of through holes connecting the two parts are provided on the surface of the debubble partition 9. A bubble duct 10 connecting the part where the liquid inlet is located is vertically provided on the top of the debubble tank 8, and a bubble containing cavity 11 is provided on the top of the bubble duct 10. The debubble tank 8 is also provided with a liquid outlet 12 connecting the part not connected to the liquid inlet. After being stirred in the primary mixing tank 4, the fracturing fluid will continue to be introduced into the debubble tank 8 for debubble operation. In this embodiment, a delivery pump 7 is provided on the connecting pipeline between the primary mixing tank 4 and the debubble tank 8. The jet of fracturing fluid will be decelerated after being stirred. In order to smoothly introduce it into the debubble tank 8, the delivery pump 7 is used to pump it into the debubble tank 8. See FIG. Figure 1 In this embodiment, the debubble baffle 9 is vertically arranged in the debubble tank 8, the vertical position of the through hole on the debubble baffle 9 is not higher than the middle of the debubble tank 8, and the vertical position of the liquid inlet of the debubble tank 8 is higher than the through hole on the debubble baffle 9. The bubble-containing fracturing fluid introduced into the debubble tank 8 from the primary mixing tank 4 will first be in the upper half of the debubble tank 8, and the through hole of the debubble baffle 9 is arranged in the lower half of the debubble tank 8, which increases the difficulty of bubbles passing through the debubble baffle 9. Therefore, the bubbles will preferentially enter the bubble duct 10 located at the top of the debubble tank 8 and move upward to the bubble containing cavity 11 to accumulate, instead of being carried out of the liquid outlet 12 with the fracturing fluid, thereby realizing the treatment of bubbles in the variable viscosity fracturing fluid.

[0021] When in use, the jet tube 3, the primary mixing tank 4, and the defoaming tank 8 are connected, the powder hopper 1 is filled with the powder to be added, and the fracturing fluid to be prepared is injected into the jet tube 3 from the liquid source to generate a jet in the jet tube 3, and then the ball valve between the powder hopper 1 and the jet tube 3 is opened, so that the powder enters the negative pressure tube 2 and is evenly sucked into the fracturing fluid jet in the jet tube 3, so that the powder fracturing fluid is evenly prepared, and then the fracturing fluid prepared with the powder is introduced into the primary mixing tank 4 for uniform mixing, and a part of the fracturing fluid is eliminated. The bubbles are separated and then pumped into the debubble tank 8 by the delivery pump 7. The stirred fracturing fluid first enters the upper part of the debubble tank 8, where the bubbles are gathered at the upper part of the debubble baffle 9 due to their own buoyancy, or enter the bubble duct 10 into the bubble chamber, while the fracturing fluid without bubbles passes through the debubble baffle 9 through the through holes in the lower part of the debubble baffle 9, and enters the subsequent pipeline through the liquid outlet 12, completing the debubble operation, thereby obtaining high-quality variable viscosity fracturing fluid with good uniformity, ensuring the preparation effect of the variable viscosity fracturing fluid.

[0022] In the description of the present invention, it should be pointed out that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and should not be understood as a limitation on the present invention.

[0023] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the embodiment of the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A negative pressure controllable dry powder variable viscosity fracturing fluid mixing device, characterized in that: The invention comprises a powder hopper (1), a negative pressure pipe (2), a jet pipe (3), a primary mixing tank (4), and a defoaming tank (8), wherein the bottom of the powder hopper (1) can be connected to the negative pressure pipe (2), the negative pressure pipe (2) is connected to the jet pipe (3) as a branch, one end of the jet pipe (3) is connected to a fracturing fluid source, and the other end is connected to the primary mixing tank (4), a mixing blade (6) is arranged in the primary mixing tank (4), and the mixing blade (6) is connected to the output end of a driving motor (5) arranged on the surface of the primary mixing tank (4) The primary mixing tank (4) is connected to the debubble tank (8), the debubble tank (8) is provided with a debubble partition (9) which completely divides the internal space of the debubble tank (8) into two parts, the debubble partition (9) is provided with a plurality of through holes connecting the two parts, a bubble duct (10) connected to the part where the liquid inlet is located is vertically arranged on the top of the debubble tank (8), a bubble containing cavity (11) is arranged on the top of the bubble duct (10), and a liquid outlet (12) connected to the part not connected to the liquid inlet is also arranged on the debubble tank (8).

2. A negative pressure controllable dry powder variable viscosity fracturing fluid mixing device according to claim 1, characterized in that: A delivery pump (7) is provided on the connecting pipeline between the primary mixing tank (4) and the defoaming tank (8).

3. A negative pressure controllable dry powder variable viscosity fracturing fluid mixing device according to claim 1, characterized in that: The debubble baffle (9) is vertically arranged in the debubble tank (8).

4. A negative pressure controllable dry powder variable viscosity fracturing fluid mixing device according to claim 3, characterized in that: The vertical position of the through hole on the debubble baffle (9) is not higher than the middle of the debubble tank (8).

5. A negative pressure controllable dry powder variable viscosity fracturing fluid mixing device according to claim 3, characterized in that: The vertical position of the liquid inlet of the debubble tank (8) is higher than the through hole on the debubble partition (9).

Images