Petroleum fracturing fluid mixing device capable of reducing precipitates

Abstract

The utility model relates to the technical field of petroleum fracturing fluid preparation, and discloses a petroleum fracturing fluid mixing device capable of reducing sediment, which comprises a mixing tank, a discharge port is arranged at the bottom of the mixing tank, a top plate and a feed port are arranged at the top of the mixing tank, a fixed shaft is fixedly connected inside the mixing tank, a movable shaft sleeve is sleeved outside the fixed shaft, and the movable shaft sleeve is sleeved outside the movable shaft sleeve. The top plate is provided with a fixed shaft and a movable shaft sleeve, the upper ends of the fixed shaft and the movable shaft sleeve extend out of the top plate, the movable shaft sleeve is provided with a stirring assembly, the stirring assembly is divided into an upper layer, a middle layer and a lower layer, the top plate is provided with a driving part, and the driving part is connected with the movable shaft sleeve. And the movable shaft sleeve and the stirring assembly are driven to reciprocate and move up and down. And through cooperation of the middle-layer stirring rod and the lower-layer stirring blades, the mixed liquid is driven to be stirred in the vertical direction, precipitation of the proppant is greatly reduced, and meanwhile the mixed liquid can be mixed more uniformly.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of oil fracturing fluid preparation, especially to a kind of oil fracturing fluid mixing devices of reducing sedimentation. BACKGROUND

[0002] Oil fracturing fluid mixing is the key link in the development of unconventional oil and gas resources such as shale gas and some low-permeability reservoirs, and is mainly used for working fluid in fracturing oil layers (mainly low-permeability oil layers) or shale gas layers.

[0003] The fracturing fluid mixing process generally involves adding thickening agents, cross-linking agents, gel breakers and proppants into water in a certain order and stirring. Because the solution becomes viscous after the reaction of thickening agents and cross-linking agents, and proppants are generally quartz sand and ceramic particles, which are prone to sedimentation. Therefore, attention should be paid to the state of the solution during the mixing process, and continuous stirring and prevention of sedimentation are required. Based on this, the applicant proposes an oil fracturing fluid mixing device that reduces sedimentation. SUMMARY

[0004] To solve the technical problems of insufficient stirring and easy sedimentation of proppants during the preparation of oil fracturing fluid, the utility model provides an oil fracturing fluid mixing device that reduces sedimentation.

[0005] The utility model adopts the following technical solutions: an oil fracturing fluid mixing device that reduces sedimentation, comprising a mixing tank, the bottom of which is provided with a discharge port, and further comprising:

[0006] A top plate is fixedly arranged on the top of the mixing tank, and a feed inlet is formed in the top plate.

[0007] A fixed shaft is fixedly connected at the lower end of the mixing tank and extends out of the top plate at the upper end.

[0008] An active shaft sleeve is sleeved on the outside of the fixed shaft and extends out of the top plate at one end.

[0009] A stirring assembly is fixedly connected to the active shaft sleeve, and the stirring assembly comprises lower stirring blades fixedly connected to the lower end of the active shaft sleeve.

[0010] A driving part is installed on the top plate and connected to the active shaft sleeve to drive the active shaft sleeve to rotate reciprocally and move up and down.

[0011] As a further improvement of the above scheme, the stirring assembly further comprises an upper stirring rod and a middle stirring rod, the upper stirring rod, the middle stirring rod and the lower stirring blade are sequentially fixedly connected on the movable shaft sleeve in the order of upper, middle and lower, and the cross section of the upper stirring rod is triangular and located below the feeding port in the initial state.

[0012] Through the above technical scheme, water is first added into the mixing tank, and then thickening agents, crosslinking agents and the like are added according to the formula. During the adding process, continuous stirring is required. The driving part can drive the movable shaft sleeve to reciprocatingly rotate and reciprocatingly move up and down. The stirring assembly on the movable shaft sleeve continuously stirs the mixed solution. In the initial state, the lower stirring blade is close to the bottom of the mixing tank. When the lower stirring blade moves upward, the solution at the bottom is driven upward, thereby avoiding precipitation.

[0013] As a further improvement of the above scheme, the top plate is further fixedly connected with a limiting sleeve, and the movable shaft sleeve penetrates through the limiting sleeve.

[0014] Through the above technical scheme, the limiting sleeve provides limiting and guiding effects for the rotation and up-and-down movement of the movable shaft sleeve.

[0015] As a further improvement of the above scheme, a flexible blocking net is connected between the bottom of the movable shaft sleeve and the bottom of the mixing tank, and a connecting flange is fixedly connected to the part of the movable shaft sleeve extending out of the top plate.

[0016] As a further improvement of the above scheme, the driving part comprises:

[0017] a support seat fixedly connected to the top plate;

[0018] a rotating shaft penetrating through the support seat, and one end of the rotating shaft is fixedly connected with a crank slider, and one end of the crank slider is movably mounted in the connecting flange;

[0019] a belt pulley sleeved on the rotating shaft, and a motor is mounted on the top plate, and the motor and the belt pulley are connected through a belt.

[0020] As a further improvement of the above scheme, a cross-shaped self-adapting adjusting hole is formed in the driving shaft, and a corresponding cross-shaped spline is fixedly arranged in the middle of the belt pulley, and the spline is located in the self-adapting adjusting hole.

[0021] Through the above technical scheme, the belt pulley can drive the rotating shaft to rotate, and the rotating shaft drives the spatial crank slider structure to rotate.

[0022] As a further improvement of the above scheme, the bottom of the mixing tank is fixedly connected with a support frame.

[0023] Compared with the prior art, the petroleum fracturing fluid mixing device has the advantages that:

[0024] The space crank slider of the driving part and the connecting flange are matched to drive the movable shaft sleeve and the stirring assembly to reciprocating rotate and move up and down. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a whole mechanism schematic view of the utility model;

[0026] Figure 2 It is a mixed tank structure sectional view of the utility model;

[0027] Figure 3 It is a stirring assembly and movable shaft sleeve connection relationship schematic view of the utility model;

[0028] Figure 4 It is a top plate and driving part connection relationship schematic view of the utility model;

[0029] Figure 5 It is a driving part structure explosion view of the utility model.

[0030] Main symbol explanation: 1, mixed tank;2, discharge port;3, support frame;4, top plate;5, feed inlet;6, fixed shaft;7, movable shaft sleeve;8, limit sleeve;9, flexible blocking net;10, connecting flange;11, stirring assembly;12, upper stirring rod;13, middle stirring rod;14, lower stirring blade;15, driving part;16, support seat;17, rotating shaft;18, crank slider;19, self-adapting adjusting hole;20, pulley;21, spline. DETAILED DESCRIPTION

[0031] Next, the utility model is further described in combination with the drawings and the specific implementation, and it should be noted that the following described embodiments or technical features can be combined to form new embodiments without conflict.

[0032] Please combine Figures 1-5 The petroleum fracturing fluid mixing device for reducing sedimentation includes a mixing tank 1, a discharge port 2 is formed in the bottom of the mixing tank 1, a top plate 4 is fixedly connected to the top of the mixing tank 1, and a feed inlet 5 is formed in the top plate 4. In addition, the mixing tank 1 is fixedly connected with a support frame 3 for supporting at the bottom.

[0033] The fixed shaft 6 is fixedly connected inside the mixing tank 1, the outer side of the fixed shaft 6 is sleeved with the movable shaft sleeve 7, and the upper end of the fixed shaft 6 and the upper end of the movable shaft sleeve 7 both extend out of the top. And the limiting sleeve 8 is fixedly installed on the top plate 4, and the movable shaft sleeve 7 penetrates the limiting sleeve 8.

[0034] The connecting flange 10 is fixedly connected on the end of the movable shaft sleeve 7 extending out of the top plate 4, the connecting flange 10 includes two flanges fixedly connected by bolts, and the connecting flange 10 is internally provided with a spherical cavity.

[0035] In addition, the driving part 15 is arranged on the top plate 4, and the driving part 15 is used to drive the movable shaft sleeve 7 to reciprocating rotate and move up and down. The stirring assembly 11 is fixedly connected on the movable shaft sleeve 7, and the fracturing fluid in the mixing tank 1 is stirred and mixed.

[0036] Firstly, the driving part 15 includes the support seat 16, the support seat 16 is fixedly connected on the top plate 4, the support seat 16 is provided with a through hole, the through hole is movably installed with the rotating shaft 17, the rotating shaft 17 penetrates the support seat 16, and the end close to the connecting flange 10 is connected with the crank slider 18. The crank slider 18 is fixedly provided with a spherical structure at the end, and the spherical structure is movably installed in the spherical cavity of the connecting flange 10.

[0037] The belt pulley 20 is also sleeved on the rotating shaft 17, and the motor is installed on the top plate 4, and the motor is connected with the belt pulley 20 through the belt. In order to make the belt pulley 20 drive the rotating shaft 17 to rotate, the cross-shaped self-adaptive adjusting hole 19 is arranged on the rotating shaft 17, the self-adaptive adjusting hole 19 is hollow designed, and the corresponding cross-shaped spline 21 is fixedly connected in the middle of the belt pulley 20, and the spline 21 is located in the self-adaptive adjusting hole 19.

[0038] Therefore, when the motor drives the belt pulley 20 to rotate, the belt pulley 20 first drives the rotating shaft 17 to rotate. When the rotating shaft 17 drives the crank slider 18 to rotate, the spatial crank slider 18 will drive the movable shaft sleeve 7 to reciprocating move up and down and reciprocating rotate along the first direction of the movable shaft sleeve 7 through the connecting flange 10. During the movement of the movable shaft sleeve 7, the fixed shaft 6 and the limiting sleeve 8 cooperate to limit and guide.

[0039] Due to the reciprocating swing of the movable shaft sleeve 7, the rotating shaft 17 will reciprocating move along the axis direction of the rotating shaft 17. Due to the connection mode of the belt pulley 20 and the rotating shaft 17, when the rotating shaft 17 moves along the axis direction, it will not affect the rotation of the belt pulley 20. Because the belt pulley 20 is limited by the two support seats 16, the belt pulley 20 cannot move, but only can rotate.

[0040] The above description, the driving part 15 can drive the movable shaft sleeve 7 reciprocating rotation and up and down, through the stirring assembly 11 on the movable shaft sleeve 7 to the mixed solution is stirred. Specifically, the stirring assembly 11 is provided with upper, middle and lower three layers, respectively, upper stirring rod 12, middle stirring rod 13 and lower stirring vane 14. Fixedly connected with movable shaft sleeve 7.

[0041] The upper stirring rod 12 (cross section) is inverted triangular structure. And in the initial state, the upper stirring rod 12 is located below the feed inlet 5. Because in actual use, generally first add thickening agent and crosslinking agent. At this time, the solution after the reaction has been relatively sticky. Because some liquid enzyme breaker is sensitive to temperature and environmental conditions, improper storage may cause its inactivation. Therefore, the common breaker is white crystalline powder ammonium persulfate breaker. The powder-like breaker falling from the feed inlet 5 may float on the surface of the solution (sticky). At this time, the inverted triangular upper stirring rod 12 is easy to press the powder-like breaker into the mixed solution in the process of moving up and down.

[0042] The middle stirring rod 13 is a frame structure, which can fully stir the solution in the mixing tank 1 during up and down movement and reciprocating swing. Since it can move up and down, it can also reduce the deposition of reactants.

[0043] The lower stirring vane 14 is spiral vane, which is close to the bottom of the mixing tank 1 in the initial state. When the lower stirring vane 14 rotates and moves upward, it can drive the reactants at the bottom upward, thereby greatly reducing the deposition of reactants.

[0044] The proppant is mainly in solid state, usually quartz sand and ceramic particles. Through the cooperation of the middle stirring rod 13 and the lower stirring vane 14, the mixed liquid is stirred in the up and down direction, which can reduce the deposition of proppant and make the mixed liquid more uniform. Improve the reaction rate between thickening agent, crosslinking agent and breaker.

[0045] In addition, since the proppant is in solid particle form, and the movable shaft sleeve 7 needs to move up and down. In order to avoid the proppant entering the position directly below the movable shaft sleeve 7 when the movable shaft sleeve 7 moves downward and resets, which may cause the movable shaft sleeve 7 and the driving part 15 mechanism to be stuck. Therefore, a flexible blocking net 9 is added between the bottom of the movable shaft sleeve 7 and the bottom of the mixing tank 1. The blocking net can stretch and compress deformation. It will not affect the movement of the movable shaft sleeve 7. But it can prevent the granular proppant from entering the lower part of the movable shaft sleeve 7.

[0046] The implementation process and principle of the petroleum fracturing fluid mixing device for reducing deposition in the embodiment of the application are as follows:

[0047] Firstly, water is added into the mixing tank 1 through the feeding port 5, then the thickening agent, cross-linking agent, breaker and proppant are sequentially added according to the formula, and in this process, different stirring is needed.

[0048] Firstly, the driving part 15 drives the movable shaft sleeve 7 to reciprocatingly rotate and move up and down through the cooperation of the spatial crank slider 18 and the connecting flange 10, so that the stirring assembly 11 can be driven to reciprocatingly rotate and move up and down, thereby the mixed liquid is fully stirred. The upper stirring rod 12 in the shape of inverted triangle facilitates the powder-like breaker to be pressed into the viscous mixed solution. The cooperation of the middle stirring rod 13 and the lower stirring blade 14 drives the mixed liquid to be stirred in the up-down direction, thereby the deposition of the proppant is greatly reduced, and meanwhile, the mixed liquid can be more uniformly mixed, and the reaction rate among the thickening agent, the cross-linking agent and the breaker is improved.

[0049] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application, and any non-essential changes and replacements made by the person skilled in the art on the basis of the present application all belong to the scope of protection required by the present application.

Claims

1. A petroleum fracturing fluid mixing device for reducing sedimentation, comprising a mixing tank, wherein a discharge port is provided at the bottom of the mixing tank, characterized in that: Also includes: A top plate, the top plate is fixedly arranged on the top of the mixing tank, and a feed port is opened on the top plate; a fixed shaft, wherein the lower end of the fixed shaft is fixedly connected to the inner bottom of the mixing tank and the upper end of the fixed shaft extends out of the top plate; A movable shaft sleeve, which is sleeved on the outside of the fixed shaft and has one end extending out of the top plate; A stirring assembly, the stirring assembly is fixedly connected to the movable shaft sleeve, the stirring assembly includes a lower stirring blade, and the lower stirring blade is fixedly connected to the lower end of the movable shaft sleeve; A driving part is installed on the top plate and is connected to the movable shaft sleeve to drive the movable shaft sleeve to rotate back and forth and move up and down.

2. The petroleum fracturing fluid mixing device for reducing sedimentation according to claim 1, characterized in that: The stirring assembly also includes an upper stirring rod and a middle stirring rod. The upper stirring rod, the middle stirring rod and the lower stirring blade are fixedly connected to the movable sleeve in sequence according to the upper, middle and lower positions. The cross-section of the upper stirring rod is triangular and is located below the feed port in the initial state.

3. The petroleum fracturing fluid mixing device for reducing sedimentation according to claim 1, characterized in that: The top plate is also fixedly connected to a limiting sleeve, and the movable shaft sleeve passes through the limiting sleeve.

4. The petroleum fracturing fluid mixing device for reducing sedimentation according to claim 1, characterized in that: A flexible barrier net is connected between the bottom of the movable sleeve and the bottom of the mixing tank, and a portion of the movable sleeve extending out of the top plate is fixedly connected to a connecting flange.

5. The petroleum fracturing fluid mixing device for reducing sedimentation according to claim 4, characterized in that: The driving unit includes: A support base, the support base is fixedly connected to the top plate; a rotating shaft, the rotating shaft passing through the supporting seat, one end of the rotating shaft being fixedly connected to a crank slider, and one end of the crank slider being movably mounted in the connecting flange; A pulley is sleeved on the rotating shaft, and a motor is installed on the top plate, and the motor is connected to the pulley through a belt.

6. The petroleum fracturing fluid mixing device for reducing sedimentation according to claim 5, characterized in that: A cross-shaped adaptive adjustment hole is provided on the rotating shaft, and a corresponding cross-shaped spline is fixedly provided in the middle of the pulley, and the spline is located in the adaptive adjustment hole.

7. The petroleum fracturing fluid mixing device for reducing sedimentation according to claim 1, characterized in that: A support frame is fixedly connected to the bottom of the mixing tank.

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