A dry powder adding device and dry powder adding method for fracturing sand mixing vehicle

Abstract

The present invention proposes a dry powder adding device for a fracturing sand mixing vehicle, comprising: a base, a discharge barrel, a hopper, a discharge turntable and a servo motor; a weighing device is arranged on the base; the discharge barrel is arranged on the base, and the surrounding side walls of the discharge barrel are directly or indirectly connected to the upper part of each weighing device respectively, and a partition is arranged on the upper part of the discharge barrel, and a discharge port is arranged on the partition; the hopper is arranged above the discharge barrel, and a connecting disk is arranged at the bottom of the hopper, and the connecting disk is connected to the upper side of the partition, and a discharge port is arranged on the connecting disk, and the discharge port is directly opposite to the discharge port; the discharge turntable is rotatably arranged between the partition and the connecting disk, and a through hole is arranged on the discharge turntable, and the through hole sweeps between the discharge port and the discharge port; a reducer is connected to the main shaft of the servo motor, and the reducer is fixed on the partition and the connecting disk, and the main shaft of the reducer is drivingly connected to the discharge turntable. The present invention also proposes a dry powder adding method, which is implemented by using the above dry powder adding device for fracturing sand mixing vehicle.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas well fracturing equipment, and in particular to a dry powder adding device and a dry powder adding method for a fracturing sand mixing vehicle. Background Art

[0002] The sand mixer can mix the fracturing fluid, proppant and various additives at the operation site in proportion, and then supply them to the fracturing pump truck to complete the reservoir transformation construction. It is the core operating equipment in fracturing construction. In fracturing construction, the dry powder addition system of the sand mixer is mainly used to complete the quantitative addition of solid additives such as capsule breakers. Capsule breakers are added to the formation together with the fracturing fluid during the fracturing construction process. Affected by the gel coat wrapped on the outside, the capsule breakers will not react with the liquid when entering the formation. After the fracturing construction is completed, the gel coat automatically dissolves due to the increase in the time the capsule breakers spend in the formation and the influence of the formation temperature. The breaker reacts with the fracturing fluid to promote the rapid breaking of the fracturing fluid, thereby achieving rapid and efficient return of the fracturing fluid. At present, the horizontal spiral is mainly used to achieve the quantitative addition of dry powder additives such as capsule breakers. Affected by the grinding effect of the spiral and its protective outer wall, the capsule coating is easily destroyed during the addition process, and the capsule breaker loses its delayed breaking effect, causing the fracturing fluid to hydrate prematurely during the construction process, directly affecting the sand carrying capacity of the fracturing fluid, and then causing fracturing construction quality accidents such as sand plugging. At the same time, the existing horizontal spiral uses a formula to calculate the real-time addition amount of dry powder additives based on the spiral speed. This method also has problems such as low measurement accuracy and the inability to truly display the displacement of dry powder additives. Regarding dry powder adding devices, domestic scholars have proposed "A dry powder adding device with anti-clogging", patent number CN201811060736.2; "A dry powder additive metering and batching device", patent number CN212651770U; "A dry powder adding device for a water reducer reactor", patent number CN211754815U; "A dry powder adding system for winemaking raw material koji", patent number CN211921483U; the above patents have optimized the structure, metering accuracy, and use of the dry powder adding device, and proposed new structures and processing methods, but the dry powder additive conveying device is still a spiral sand conveying device, which cannot solve the problem of capsule coating breakage during the addition process. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a dry powder adding device for a fracturing sand mixing vehicle and a fracturing and sealing method thereof, so as to overcome the above problems or at least partially solve or alleviate the above problems.

[0004] The present invention provides a dry powder adding device for a fracturing sand mixing vehicle, comprising:

[0005] A base, the base is a four-sided closed structure with a hole in the middle, and weighing devices are arranged on the four sides of the base;

[0006] A material discharge barrel, the material discharge barrel is arranged above the base, an opening is arranged at the bottom of the material discharge barrel, the side walls around the material discharge barrel are respectively directly or indirectly connected to the upper part of each weighing device, a partition is arranged at the upper part of the material discharge barrel, and a material discharge port is arranged on the partition;

[0007] A hopper, the hopper is arranged above the lower barrel, a connecting plate is arranged at the bottom of the hopper, the connecting plate is connected to the upper side of the partition, a discharge port is arranged on the connecting plate, and the discharge port is directly opposite to the lower barrel;

[0008] A material unloading turntable, the material unloading turntable is rotatably arranged between the partition plate and the connecting plate, and a through hole is arranged on the material unloading turntable, and the through hole sweeps between the material unloading port and the material discharging port;

[0009] A servo motor, a main shaft of which is connected to a reducer, the reducer is fixed on the partition and the connecting disk, and the main shaft of the reducer is drivingly connected to the unloading turntable.

[0010] The present invention also has the following optional features.

[0011] Optionally, a screen is provided in the opening of the hopper.

[0012] Optionally, a level sensor is provided on the side wall of the hopper.

[0013] Optionally, an injection manifold interface is provided on the outside of the lower barrel, and a drainage groove is provided in the lower barrel, one end of the drainage groove is connected to the injection manifold interface, and the other end of the drainage groove leads to the lower end of the lower barrel.

[0014] Optionally, a hopper cover is further included, wherein the hopper cover is assembled on the upper port of the hopper and a switch sensor is provided on the hopper cover.

[0015] Optionally, a brush is provided on the upper edge of the unloading turntable.

[0016] Optionally, the unloading turntable is in a fan-shaped structure, and the center of its arc is connected to the main shaft of the reducer.

[0017] The present invention also provides a dry powder adding method, which is implemented by using the dry powder adding device for a fracturing sand mixing vehicle as described in any one of the above items, and comprises the following steps:

[0018] Step S001: Add dry powder additives into the hopper, and the dry powder additives in the hopper enter the discharge barrel through the discharge port and the through hole;

[0019] Step S002: injecting fracturing liquid into the lower barrel through the injection manifold interface, and the fracturing liquid flushes and mixes the dry powder additive;

[0020] Step S003: Calculate the material unloading rate according to the weight change detected by the weighing sensor, drive the unloading turntable to rotate through the servo motor and the reducer, and change the material unloading rate by changing the overlap between the unloading port and the through hole.

[0021] The dry powder adding device and dry powder adding method for the fracturing sand mixing vehicle of the present invention prefabricates dry powders such as capsule breakers in the hopper, adds dry powder additives through the discharge port at the lower end of the hopper, and measures the weight change of the material in real time through the weighing device to obtain the feeding rate, thereby controlling the servo motor and the reducer to drive the feeding turntable to adjust the opening of the discharge port to ensure that the feeding rate is stable at the target value. The main effects are: 1. Effectively improve the metering accuracy of the dry powder addition rate; 2. At the same time, it can effectively avoid the damage to the capsule coating caused by the spiral grinding of the conventional dry powder adding device; thereby improving the quality of fracturing construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 2. It is a schematic diagram of the forward structure of the dry powder adding device for the fracturing sand mixing vehicle of the present invention;

[0023] Figure 2 yes Figure 1 Right view of;

[0024] Figure 3 yes Figure 1 A top view of

[0025] Figure 4 It is a schematic diagram of the internal structure of the lower barrel;

[0026] Figure 5 This is a diagram of the screen structure.

[0027] In the above figure: 1 base; 2 weighing device; 201 connecting plate; 3 discharge barrel; 301 drainage trough; 4 partition; 401 discharge port; 5 hopper; 6 connecting plate; 601 discharge port; 7 discharge turntable; 701 through hole; 8 servo motor; 9 reducer; 10 screen; 11 level sensor; 12 injection manifold interface; 13 hopper cover; 14 position sensor.

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0029] Example 1

[0030] refer to Figure 1 , Figure 2 and Figure 3The embodiment of the present invention provides a dry powder adding device for a fracturing sand mixing vehicle, comprising: a base 1, a discharge barrel 3, a hopper 5, a discharge turntable 7 and a servo motor 8; the base 1 is a four-sided closed structure with a hole in the middle, and weighing devices 2 are arranged on the four sides of the base 1; the discharge barrel 3 is arranged above the base 1, and an opening is arranged at the bottom of the discharge barrel 3, and the side walls around the discharge barrel 3 are directly or indirectly connected to the upper part of each weighing device 2, respectively, and a partition 4 is arranged on the upper part of the discharge barrel 3, and a discharge port 401 is arranged on the partition 4; the hopper 5 is arranged on the upper part of the discharge barrel 3. On the other hand, a connecting plate 6 is provided at the bottom of the hopper 5, and the connecting plate 6 is connected to the upper side of the partition 4. A discharge port 601 is provided on the connecting plate 6, and the discharge port 601 is opposite to the unloading port 401; the unloading turntable 7 is rotatably arranged between the partition 4 and the connecting plate 6, and a through hole 701 is provided on the unloading turntable 7, and the through hole 701 sweeps between the unloading port 401 and the discharge port 601; a reducer 9 is connected to the main shaft of the servo motor 8, and the reducer 9 is fixed on the partition 4 and the connecting plate 6, and the main shaft of the reducer 9 is transmission-connected to the unloading turntable 7.

[0031] The base 1 is installed at the upper end of the sand mixing tank, and the discharge port 601 at the bottom of the discharge barrel 3 is opposite to the upper opening of the sand mixing tank. Before the fracturing construction, the dry powder additive is prefabricated in the hopper 5, and the hopper 5 can prefabricate more than 20L of dry powder additive; after the fracturing construction starts, when the dry powder additive needs to be added, the operator sets the adding speed of the dry powder additive on the control system; the control system drives the discharge turntable 7 to rotate through the servo motor 8 and the reducer 9 according to the setting; the discharge turntable 7 rotates to a suitable position under the control of the servo motor 8 and the reducer 9, so that the through hole 701 coincides with the discharge port 601; at the same time, a The position sensor 14 between the connecting disk 6 detects the rotation position of the turntable baffle 7 in real time, and feeds back the detection result to the control system; at the same time, the weighing device 2 measures the real-time unloading speed, and feeds back the measured value to the control system in real time; the control system compares the error between the actual value and the target value of the unloading rate measurement in real time, and adjusts the overlap between the through hole 701 on the unloading turntable 7 and the discharge port 601 according to the error size, so as to realize stable control of the feeding speed; after the construction is completed, the operator controls the unloading turntable 7 to rotate to the state of completely blocking the discharge port 601 through the servo motor 8 in the control system.

[0032] Example 2

[0033] refer to Figure 1 and Figure 5 On the basis of Example 1, a screen 10 is provided in the opening of the hopper 5 .

[0034] The screen 10 can be a fixed filter screen or a vibrating screen with a transmission structure and a heating device, and the vibrating screen can break up the agglomerated dry powder additive.

[0035] Example 3

[0036] refer to Figure 2 Based on Example 1 or 2, a level sensor 11 is provided on the side wall of the hopper 5.

[0037] The level sensor 11 can detect the amount of dry powder additive in the hopper 5 . When the level sensor 11 detects that the dry powder additive in the hopper 5 is emptied, the control system can stop the operation of the entire adding device and remind the staff to add material to the hopper 5 .

[0038] Example 4

[0039] refer to Figure 1 , Figure 2 and Figure 4 On the basis of Example 1 or 3, an injection manifold interface 12 is provided on the outside of the lower barrel 3, and a drainage groove 301 is provided inside the lower barrel 3, one end of the drainage groove 301 is connected to the injection manifold interface 12, and the other end of the drainage groove 301 leads to the lower end of the lower barrel 3.

[0040] The drainage groove 301 increases the liquid flow rate by reducing the conduction cross-section. The liquid passing through the drainage groove 301 forms a water curtain at the bottom of the lower barrel 3, ensuring that the liquid in the sand mixing tank does not enter the dry powder adding device during the upward splashing process, thereby preventing the interior of the lower barrel 3 from being wetted before the dry powder additive is added to the sand mixing tank.

[0041] Example 5

[0042] refer to Figure 1 and Figure 2 On the basis of Example 1 or 4, it further includes a hopper cover 13, which is assembled on the upper port of the hopper 5, and a switch sensor is provided on the hopper cover 13.

[0043] When the hopper cover 13 is opened, the switch sensor is triggered and the dry powder adding device enters the adding mode; when the hopper cover 13 is closed after the adding is completed, the switch sensor is released and the dry powder adding device enters the normal working mode.

[0044] Example 6

[0045] refer to Figure 1 Based on Example 1 or 5, a brush is provided on the upper edge of the unloading turntable 7.

[0046] The unloading turntable 7 is located between the partition 4 and the connecting disk 6. In order to prevent the dry powder additive from entering the gap between the unloading turntable 7 and the connecting disk 6, a brush can be set on the upper edge of the unloading turntable 7. When the unloading turntable 7 swings, the brush can block the gap.

[0047] Example 7

[0048] refer to Figure 1 On the basis of Example 1 or 6, the unloading turntable 7 is a fan-shaped structure, and its arc center is connected to the main shaft of the reducer 9.

[0049] The main shaft of the reducer 9 passes through the part between the partition 4 and the connecting disk 6 and is connected to the arc center position of the unloading turntable 7, which can drive the edge of the unloading turntable 7 to swing between the unloading port 401 of the partition 4 and the discharge port 601 of the connecting disk 6. The opening of the discharge port 601 can be changed by changing the overlap between the through hole 701 on the unloading turntable 7 and the discharge port 601.

[0050] Example 8

[0051] An embodiment of the present invention proposes a dry powder adding method, which is implemented by the dry powder adding device for a fracturing sand mixing vehicle described in all the above embodiments, and includes the following steps: Step S001: adding dry powder additives into the hopper 5, and the dry powder additives in the hopper 5 enter the discharge barrel 3 through the discharge port 601 and the through hole 701; Step S002: pumping fracturing liquid into the discharge barrel 3 through the injection manifold interface 12, and the fracturing liquid flushes and mixes the dry powder additive; Step S003: calculating the discharge rate according to the weight change detected by the weighing sensor, driving the discharge turntable 7 to rotate through the servo motor 8 and the reducer 9, and changing the discharge rate by changing the overlap between the discharge port 601 and the through hole 701.

[0052] Before fracturing construction, the dry powder additive is prefabricated in the hopper 5, and the hopper 5 can prefabricate more than 20L of dry powder additive; after fracturing construction begins, the valve on the injection manifold interface 12 is opened, and the fracturing liquid in the centrifugal pump sucked by the sand mixing truck enters the drainage groove 301 through the injection manifold interface 12; the drainage groove 301 can increase the liquid flow rate and flush the bottom of the device. At the same time, the liquid in the drainage groove 301 forms a water curtain at the bottom of the device to ensure that the liquid in the sand mixing tank does not enter the device during the upward splashing process, and avoid the dry powder additive from being wetted before adding; when the dry powder additive needs to be added, the operator controls the dry powder additive on the control system The adding speed is set; the control system drives the unloading turntable 7 to rotate through the servo motor 8 and the reducer 9 according to the setting; the unloading turntable 7 rotates to a suitable position under the control of the servo motor 8 and the reducer 9; the position sensor 14 detects the rotation position of the turntable baffle 7 in real time and feeds back the detection result to the control system; during the addition of dry powder additives, the bristles on the upper edge of the unloading turntable 7 are used to clean and block the additives from entering the rotating parts and gaps of the unloading turntable 7. When the servo motor 8 is in motion and the position sensor 14 does not detect the motion of the unloading turntable 7, the position sensor 14 sends an alarm signal to the control system. When the feed turntable 7 is cleaned and the problem is checked, the weighing device 2 measures the real-time feed speed and feeds back the measured value to the control system in real time. The control system compares the error between the actual feed speed measurement value and the target value in real time, and adjusts the overlap between the through hole 701 on the feed turntable 7 and the discharge port 601 according to the error size, so as to realize the stable control of the feeding speed. When the amount of dry powder added in the hopper 5 is small, the level sensor 11 issues an alarm that the hopper 5 is short of material. At this time, the operator opens the hopper cover 13, and the dry powder adding device automatically enters the feeding mode. At this time, the feed turntable 7 is kept The opening degree of the hopper 5 before opening remains unchanged, and the screen 10 using the transmission structure automatically starts the vibration function; the personnel add the dry powder additive at the top of the hopper 5, and the additive enters the hopper 5 after passing through the screen 10, and the agglomerated dry powder additive is broken up in the screen 10, and then falls into the hopper 5 for addition; when the dry powder additive in the hopper 5 is full, the hopper cover 13 is closed, and the dry powder adding device automatically enters the operation mode; after the construction is completed, the operator controls the unloading turntable 6 to rotate to the state of completely blocking the discharge port 601 through the servo motor 8 in the control system, and then closes the valve on the injection manifold interface 12, and the dry powder adding device stops working.

[0053] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention 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 by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The components and structures that are not described in detail in this embodiment are well-known components and common structures or common means in the industry, and are not described here one by one.

Claims

1. A dry powder adding device for a fracturing sand mixing vehicle, characterized in that: include: A base (1), the base (1) being a four-sided closed structure with a hole in the middle, and weighing devices (2) being arranged on the four sides of the base (1); A material discharge barrel (3), wherein the material discharge barrel (3) is arranged above the base (1), an opening is arranged at the bottom of the material discharge barrel (3), the side walls around the material discharge barrel (3) are respectively directly or indirectly connected to the upper part of each weighing device (2), a partition (4) is arranged at the upper part of the material discharge barrel (3), and a material discharge port (401) is arranged on the partition (4); an injection manifold interface (12) is arranged at the outer side of the material discharge barrel (3), a drainage groove (301) is arranged inside the material discharge barrel (3), one end of the drainage groove (301) is connected to the injection manifold interface (12), and the other end of the drainage groove (301) leads to the lower end of the material discharge barrel (3), the drainage groove (301) increases the flow rate of the liquid by reducing the conduction cross section, and the liquid passing through the drainage groove (301) forms a water curtain at the bottom of the material discharge barrel (3); A hopper (5), the hopper (5) being arranged above the lower barrel (3), a connecting plate (6) being arranged at the bottom of the hopper (5), the connecting plate (6) being connected to the upper side of the partition (4), a discharge port (601) being arranged on the connecting plate (6), the discharge port (601) being directly opposite to the lower barrel (401); a screen (10) being arranged in the opening of the hopper (5), the screen (10) being a vibrating screen having a transmission structure and a heating device; A material unloading turntable (7), the material unloading turntable (7) being rotatably disposed between the partition plate (4) and the connecting plate (6), the material unloading turntable (7) being provided with a through hole (701), the through hole (701) sweeping between the material unloading port (401) and the material discharging port (601); A servo motor (8), wherein a reducer (9) is connected to the main shaft of the servo motor (8), the reducer (9) is fixed to the partition plate (4) and the connecting plate (6), and the main shaft of the reducer (9) is drivingly connected to the unloading turntable (7).

2. The dry powder adding device for fracturing sand mixing vehicle according to claim 1, characterized in that: A level sensor (11) is provided on the side wall of the hopper (5).

3. The dry powder adding device for fracturing sand mixing vehicle according to claim 1, characterized in that: It also comprises a hopper cover (13), wherein the hopper cover (13) is assembled on the upper port of the hopper (5), and a switch sensor is arranged on the hopper cover (13).

4. The dry powder adding device for fracturing sand mixing vehicle according to claim 1, characterized in that: The upper edge of the unloading turntable (7) is provided with a brush.

5. The dry powder adding device for fracturing sand mixing vehicle according to claim 1, characterized in that: The unloading turntable (7) is in a fan-shaped structure, and its arc center is connected to the main shaft of the reducer (9).

6. A dry powder adding method, implemented by using the dry powder adding device for a fracturing sand mixing vehicle according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step S001: Add dry powder additives into the hopper, and the dry powder additives in the hopper enter the discharge barrel through the discharge port and the through hole; Step S002: injecting fracturing liquid into the lower barrel through the injection manifold interface, and the fracturing liquid flushes and mixes the dry powder additive; Step S003: Calculate the material unloading rate according to the weight change detected by the weighing sensor, drive the unloading turntable to rotate through the servo motor and the reducer, and change the material unloading rate by changing the overlap between the unloading port and the through hole.

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