A polymer dry powder online instant mixing fracturing fluid device and mixing method

Abstract

The present invention relates to the field of chemical engineering and oil and gas extraction technology, and in particular to an online instant mixing and fracturing fluid device for polymer dry powder and a mixing method. The device comprises: a skid seat, on which a transport component, a storage component, a mixing component and a power component are provided; a storage tank, fixedly connected to the skid seat, the storage tank is equipped with a transmission component, a rotating frame is provided in the storage tank, the transmission component is used to drive the spiral lifting of the rotating frame, and the rotating frame is provided with inclined sharp parts symmetrically distributed in the center; a vibration component is provided in the storage tank. The present invention rotates the rotating frame and moves upward along the threaded rod, so that the dry powder on the upper layer of the inclined sharp part of the rotating frame moves upward, and pores are formed between the dry powders, so as to reduce the occurrence of the phenomenon that the lower layer of the dry powder is compacted due to excessive temporary storage, thereby reducing the probability that the dry powder cannot be discharged from the storage tank due to compaction, resulting in insufficient dry powder content in the fracturing fluid, thereby ensuring the quality of the fracturing fluid.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical industry and oil and gas extraction, and in particular to an online fast-dissolving polymer dry powder fracturing fluid mixing device and a mixing method. Background Art

[0002] With the advancement of drilling technology, horizontal well fracturing and acidizing have become one of the important measures to improve the recovery rate of oil and gas wells. They have been widely used in the field of oil and gas development. For low permeability, ultra-low permeability and unconventional oil and gas reservoirs, fracturing technology has gradually become low-damage, low-cost (tens of yuan / m 3 ), large-scale (1500-3000m 3 / layer or section), large displacement (15-25m 3 / min) direction.

[0003] When fracturing a horizontal well, fracturing fluid, such as polymer emulsion, is generally injected into the well to improve fracturing efficiency. Due to the limitations of the fracturing well site, overly large equipment is less convenient. Therefore, it is necessary to reduce on-site fracturing equipment to make the fracturing device layout more compact and environmentally friendly, and to improve the online mixing capacity and efficiency of the fracturing fluid.

[0004] Online mixing technology for polymer emulsions (inverse phase and suspension) has gradually matured and is being used on a large scale in production. However, due to the low effective concentration (≤40%) in polymer emulsions and the presence of solvent oil, dispersants, suspending agents (such as organic soil), and surfactants, the polymer emulsion is ineffective. To compensate for this ineffectiveness, its usage will increase, which will damage the reservoir and thus affect environmental production. Storage damage will also affect the safety of personnel. For this reason, an online instant mixing technology for polymer dry powder has been proposed. When mixing polymer emulsions, the polymer dry powder and water temporarily stored in the storage tank are directly transported to the mixer for mixing. The online instant mixing technology for polymer dry powder can be used to quickly prepare a concentrate online, which is then diluted with water in proportion to prepare fracturing fluid. Low-concentration concentrates have good dispersibility, but the required amount of low-concentration concentrates is large and not stable enough. High-concentration concentrates have problems such as uneven dispersion, "fish eyes", difficulty in discharge, and large amounts of dust caused by manual addition.

[0005] The existing dry powder needs to be temporarily stored in a storage tank before mixing. When there is too much dry powder accumulated in the storage tank, the dry powder in the lower layer will be agglomerated by the pressure of the upper layer. The agglomerated dry powder will adhere and accumulate in the storage tank. The dry powder adhered and accumulated in the storage tank cannot participate in mixing, resulting in insufficient concentration of the produced fracturing fluid. When the amount of dry powder accumulated and adhered in the storage tank increases, the subsequent stored dry powder will mix with the accumulated dry powder and participate in subsequent mixing, which will cause the subsequent production of fracturing fluid to have too high a concentration. The above two situations will lead to unstable concentration of fracturing fluid production, affecting the effect of fracturing fluid. Summary of the Invention

[0006] In order to overcome the shortcomings mentioned in the above background, the present invention provides an online fast-dissolving polymer dry powder fracturing fluid mixing device and mixing method.

[0007] A device for online instant mixing of polymer dry powder into fracturing fluid, comprising:

[0008] A skid, on which a transport assembly, a storage assembly, a mixing assembly, and a power assembly are provided. The transport assembly uses compressed air to transport dry powder to the storage assembly. The storage assembly is used to temporarily store dry powder. The mixing assembly is used to mix dry powder and liquid online. The power assembly is used to provide a power source for the transport assembly, the storage assembly, and the mixing assembly.

[0009] A storage tank is fixedly connected to the skid. The storage tank is a fully enclosed structure. A transmission member is installed on the storage tank. A rotating frame is provided inside the storage tank. The transmission member is used to drive the rotating frame to spirally rise and fall. The rotating frame is provided with inclined sharp portions distributed symmetrically around the center.

[0010] A vibration component is arranged in the storage tank and is used to vibrate the dry powder in the storage tank when the rotating frame spirally rises and falls.

[0011] Furthermore, the transport component includes:

[0012] A transport tank is fixedly connected to the skid, and the transport tank is a fully enclosed structure;

[0013] a first air compressor fixedly connected to the skid;

[0014] The delivery pipeline is connected to the transport tank and the first air compressor. The delivery pipeline is installed with a first gate valve and a first pressure gauge. The inner diameter of the delivery pipeline gradually increases from near the first air compressor to near the transport tank.

[0015] Furthermore, the storage component includes:

[0016] A spiral meter is fixedly connected to the skid;

[0017] A boiling bin is fixedly connected to the skid, the boiling bin is connected to a feed pipe, the feed pipe is equipped with an external backflush, a powder feed line is connected between the transport tank and the storage tank, the inner diameter of the powder feed line gradually increases from near the transport tank to near the storage tank, and the powder feed line is equipped with a first electric control valve;

[0018] an exhaust pipeline connected to the upper portion of the storage tank, wherein the exhaust pipeline is equipped with a dry powder filter;

[0019] A dehumidifier is installed on the storage tank.

[0020] Furthermore, the mixing component includes:

[0021] a lifting water pump, fixedly connected to the skid;

[0022] a second air compressor fixedly connected to the skid, the feed pipe being in communication with the second air compressor;

[0023] a liquid adding pump fixedly connected to the skid, the liquid adding pump being connected to a water pipeline, the water pipeline being connected to an external water reservoir with a valve, the water pipeline being installed with a second pressure gauge, a second gate valve, a second electric control valve and an electronic flow meter;

[0024] An elevator is mounted on the skid, the elevator being fixedly connected to a super mixer, the lifting water pump being connected to the super mixer via a conduit, the water pipeline being connected to the super mixer, the storage tank being connected to the super mixer via the feed pipe and the boiling chamber, the inner diameter of the feed pipe gradually increasing from near the storage tank to near the super mixer, and the skid being mounted with an automatic controller electrically connected to the super mixer.

[0025] Furthermore, the super mixer consists of an ejector, a dry powder jet gun, a disperser, a pressure reducer and a discharge part. The dry powder jet gun is located in the ejector and is matched with the ejector. One end of the dry powder jet gun is a disperser, a pressure reducer and a discharge part. The discharge part is used to communicate with an external sand mixing tank.

[0026] Furthermore, the ejector of the super mixer and the dry powder jet gun both adopt the slit jet method, and the diameter and length of the dry powder jet gun are matched with the ejector to meet the requirement that the displacement of the lifting pump is ≥0.6m 3 / min, pressure ≥0.2MPa.

[0027] Furthermore, the power assembly includes a generator and a high-voltage cable unit, the first air compressor and the first pressure gauge are electrically connected to the generator through the high-voltage cable unit, the spiral meter, the first electrically controlled valve and the dehumidifier are electrically connected to the generator through the high-voltage cable unit, the lift water pump, the second air compressor, the liquid addition pump, the second pressure gauge, the second electrically controlled valve, the electronic flow meter, the elevator, the super mixer and the automatic controller are electrically connected to the generator through the high-voltage cable unit, and the transmission part is electrically connected to the generator through the high-voltage cable unit.

[0028] Furthermore, the vibration component includes:

[0029] A rotating block is fixedly connected to the transmission member, wherein the rotating block is fixedly connected to a plurality of elastic telescopic rods, and the telescopic ends of the elastic telescopic rods are fixedly connected to impact blocks;

[0030] There are a plurality of limiting blocks, which are fixed to the storage tank and are used to squeeze the adjacent impact blocks.

[0031] Furthermore, it also includes:

[0032] A moisture-isolating layer is fixedly connected to the storage tank and is made of a flexible material;

[0033] The inner liner is fixed in the moisture-isolating layer. The inner liner is made of elastic metal. The impact block is used to impact the inner liner.

[0034] A method for mixing polymer dry powder online instant fracturing fluid is based on the above-mentioned device for mixing polymer dry powder online instant fracturing fluid, and the specific steps are as follows:

[0035] S1: Start the generator of the power assembly, start the first air compressor, and the polymer dry powder in the transport assembly is carried by the compressed air in the first air compressor and transported to the storage assembly through the conveying pipeline in a closed manner;

[0036] S2: After the dry powder is temporarily stored in the storage tank, the rotating frame is spirally raised and lowered through the transmission member to form pores between the dry powder in the storage tank. The rotating frame drives the impact block to rotate through the rotating block and the elastic telescopic rod. The impact block is squeezed by the restricted block to move and impact the inner tank;

[0037] S3: The first electronically controlled valve, dry powder filter, dehumidifier, valve, and spiral meter of the storage assembly are opened. The polymer dry powder is metered by the spiral meter and then output. The dry powder is mixed with the dry air treated by the dehumidifier and atomized in the boiling chamber. The dry powder is then transported through the feed pipe to the dry powder jet gun of the super mixer. The gas filtered by the dry powder filter is discharged through the exhaust pipeline, leaving the dry powder behind.

[0038] S4: Open the valve of the external water reservoir and slowly start the lifting water pump to empty it. After the circulation is normal, open the second electric control valve. After the readings of the electronic flow meter and the second pressure gauge are stable, the polymer dry powder in the dry powder jet gun on the super mixer is mixed with the pressurized water flow of the ejector. The dry powder, water and gas are fully dispersed, mixed, dissolved and degassed through the disperser and pressure reducer to obtain a fully dissolved concentrated liquid.

[0039] S5: The concentrate automatically flows from the discharge part of the super mixer into the external sand mixing tank by gravity, and is diluted with water in proportion to form the fracturing fluid base fluid. The concentration is adjusted by viscosity testing;

[0040] S6: Start the fluid adding pump, add fracturing fluid additives in proportion, mix with fracturing fluid base fluid to prepare fracturing fluid for use in fracturing construction;

[0041] S7: When it is necessary to stop using the device, turn off the generator of the power component of the device and clean the device for the next use.

[0042] The beneficial effects of the present invention are as follows: 1. The present invention rotates the turret and moves upward along the threaded rod, so that the dry powder on the upper layer of the inclined sharp portion of the turret moves upward, forming pores between the dry powder, thereby reducing the occurrence of excessive temporary storage of dry powder causing the lower layer to be compacted, thereby reducing the probability of insufficient dry powder content in the fracturing fluid due to the dry powder being compacted and unable to be discharged from the storage tank, thereby ensuring the quality of the fracturing fluid;

[0043] 2. By quickly dissolving the polymer dry powder online and mixing it with the fracturing fluid, the mixture is evenly dispersed, fully dissolved, and free of "fish eyes." The height of the super mixer is adjusted using a lift, allowing the fracturing fluid to automatically flow into the external sand mixing tank after mixing. This solves the problem of concentrated fluid pumping and achieves automation, full enclosure, and dust-free operation from dry powder transportation, storage, and mixing. This reduces worker labor intensity, dust, and packaging pollution, and is environmentally friendly.

[0044] 3. Using the slit jet method, the atomized polymer dry powder is mixed with the high-pressure water in the ejector through the dry powder jet gun. After the multiple dispersion, mixing, dissolution and degassing mechanisms of the disperser and pressure reducer, the mixing can be made more uniform and the dissolution speed can be accelerated. After the concentrate is diluted according to the proportion and the additives are added, the required concentration of fracturing fluid is prepared, which greatly improves the mixing efficiency.

[0045] 4. By turning on the external back-blower, the compressed air generated by the external back-blower enters the storage tank through the feed pipe to assist the flow of the dry powder in the storage tank, so that the dry powder in the storage tank remains loose, thereby preventing the dry powder from agglomerating and causing uneven mixing of the fracturing fluid, thereby affecting the concentration of the fracturing fluid and further affecting the quality of the fracturing fluid;

[0046] 5. By setting the inner diameter of the pipeline through which the dry powder flows, the flow area where the dry powder flows is gradually increased, thereby reducing the probability of the dry powder being compacted by the pipeline during transportation, which in turn affects the output of the dry powder, resulting in the quality of the fracturing fluid being affected and even causing pipeline blockage;

[0047] 6. Use the impact block to impact the inner liner. If there is less dry powder in the liner, the inner liner will be shaken by the impact, and the moisture barrier layer will be deformed, and the dry powder adhering to the inner wall of the liner will be shaken off. If there is more dry powder in the liner at this time, the dry powder inside will be loosened by vibrating the inner liner to reduce the probability of the dry powder being compacted and agglomerated, and the dry powder adhering to the inner wall of the liner will be shaken off to improve the accuracy of the dry powder addition when mixing the fracturing fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. The drawings in the description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the drawings without creative work.

[0049] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0050] Figure 2 Schematic diagram of the three-dimensional structure of the super mixer of the present invention;

[0051] Figure 3 Schematic diagram of the three-dimensional structure of the storage tank of the present invention;

[0052] Figure 4 This is a schematic diagram of the three-dimensional structure of the water lifting pump and the liquid adding pump of the present invention;

[0053] Figure 5 Schematic diagram of the three-dimensional structure of the dehumidifier of the present invention;

[0054] Figure 6 This is a sectional view of the three-dimensional structure of the storage tank, moisture barrier layer and inner liner of the present invention;

[0055] Figure 7 It is a schematic diagram of the three-dimensional structure of the impact block and the limit block of the present invention;

[0056] Figure 8 This is a sectional view of the three-dimensional structure of the elastic telescopic rod of the present invention;

[0057] Figure 9 It is a system diagram of the present invention.

[0058] Markings in the drawings: 1: skid, 2: transport assembly, 201: transport tank, 202: first air compressor, 203: transport pipeline, 204: first gate valve, 205: first pressure gauge, 3: storage assembly, 301: spiral metering device, 302: boiling bin, 303: feeding pipe, 304: powder inlet pipeline, 305: first electric control valve, 306: exhaust pipeline, 307: dry powder filter, 308: dehumidifier, 4: mixing assembly, 401: lifting water pump, 402: second Air compressor, 403: Liquid addition pump, 404: Water pipeline, 405: Second pressure gauge, 406: Second gate valve, 407: Second electric control valve, 408: Electronic flow meter, 409: Elevator, 410: Super mixer, 411: Automatic controller, 5: Power component, 6: Storage tank, 601: Transmission part, 602: Rotating frame, 7: Vibration component, 701: Rotating block, 702: Elastic telescopic rod, 703: Impact block, 704: Limit block, 8: Moisture barrier, 9: Inner liner. DETAILED DESCRIPTION

[0059] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0060] In the following embodiments, the storage component 3, the mixing component 4 and the power component 5 can be integrated or arbitrarily combined and separated; the number and size of the transport component 2 and the storage component 3 can be determined according to actual needs, and can be single tank or multiple tanks, and can be vehicle-mounted or skid-mounted, for flexible operation.

[0061] A polymer dry powder online instant mixing fracturing fluid device, such as Figures 1-9 As shown, it includes: a skid 1, on which a transport component 2, a storage component 3, a mixing component 4 and a power component 5 are arranged. The transport component 2 uses compressed air to transport the dry powder to the storage component 3, the storage component 3 is used to temporarily store the dry powder, the mixing component 4 is used to mix the dry powder and the liquid online, and the power component 5 is used to provide a power source for the transport component 2, the storage component 3 and the mixing component 4; a storage tank 6 is fixed to the skid 1, and the storage tank 6 is a fully enclosed structure. The storage tank 6 is equipped with a transmission member 601, which consists of a motor, a threaded rod, a rotating disk and two rotating rods, wherein the motor is fixed to the storage tank 6, and the threaded rod is fixed to the storage tank 6. , and the threaded rod is rotatably connected to the rotating disk, the output shaft of the motor on the transmission member 601 is fixedly connected to its rotating disk, the rotating disk is sealed and rotatably connected to the storage tank 6, the two rotating rods are fixedly connected to the rotating disk, a rotating frame 602 is provided in the storage tank 6, the two rotating rods of the transmission member 601 both penetrate the rotating frame 602 and are slidably connected thereto, the rotating frame 602 is threadedly connected to the threaded rod of the transmission member 601, the transmission member 601 is used to drive the rotating frame 602 to spirally rise and fall, and the rotating frame 602 is provided with inclined sharp portions symmetrically distributed along the center; the vibration component 7 is provided in the storage tank 6, and is used to vibrate the dry powder in the storage tank 6 when the rotating frame 602 spirally rises and falls.

[0062] As an optimization, the polymer dry powder in this embodiment is of the instant type, with a dissolution time of <300s (400r / min) and a particle size of 120-200 mesh (or finer) to facilitate atomization, carrying, dispersion, and dissolution.

[0063] In this embodiment, the motor of the transmission member 601 is electrically connected to an external terminal, wherein the external terminal is an existing structure and is not shown in the figure.

[0064] The specific working principle is as follows:

[0065] When dry powder is temporarily stored in the storage tank 6, the motor of the transmission member 601 is turned on through the external terminal, and the output shaft of the motor on the transmission member 601 drives the two rotating rods to rotate clockwise through the rotating disk (where the rotation angle is Figure 1The two rotating rods drive the rotating frame 602 to rotate clockwise, and the inclined sharp portion of the rotating frame 602 is inserted into the dry powder. The rotating frame 602 rotates and moves upward along the threaded rods, so that the dry powder located above the inclined sharp portion of the rotating frame 602 moves upward, forming pores between the dry powder to prevent the dry powder from being temporarily stored too much and causing the lower layer to be compacted.

[0066] When the rotating frame 602 moves upward to the limit state, the output shaft of the motor on the transmission member 601 is reversed, so that the rotating disk of the rotating frame 602 drives the rotating frame 602 to rotate counterclockwise through the two rotating rods. The inclined sharp part at the bottom of the rotating frame 602 is inserted into the dry powder layer by layer. As the rotating frame 602 rotates, the dry powder is separated layer by layer from top to bottom, so that the dry powder in the storage tank 6 is continuously turned over, reducing the probability of dry powder agglomeration in the storage tank 6, thereby reducing the probability of dry powder being compacted and unable to be discharged from the storage tank 6, resulting in insufficient dry powder content in the fracturing fluid, thereby ensuring the quality of the fracturing fluid produced subsequently.

[0067] When the device is not in use, the motor of the transmission member 601 can be turned off through the external terminal.

[0068] like Figure 1 、 Figure 2 and Figure 9 As shown, the transport component 2 includes: a transport tank 201, which is fixed to the skid 1 and is a fully enclosed structure to prevent external air from contacting the dry powder; a first air compressor 202, which is fixed to the skid 1; a delivery pipeline 203, which is connected to the transport tank 201 and the first air compressor 202, and the delivery pipeline 203 is installed with a first gate valve 204 and a first pressure gauge 205. The inner diameter of the delivery pipeline 203 gradually increases from near the first air compressor 202 to near the transport tank 201, so that when the dry powder is transported in the delivery pipeline 203, the flow area through which the dry powder flows gradually increases, thereby preventing the dry powder from being restricted by the delivery pipeline 203 during transportation and being compacted, thereby affecting the output of the dry powder, causing the quality of the fracturing fluid to be affected, and even causing the delivery pipeline 203 to be blocked.

[0069] As an optimization, the fully enclosed structure of the transport tank 201 and the storage tank 6 prevents moisture from entering the storage tank 6 and causing the dry powder inside to become wet, thereby reducing the probability of dry powder adhering to the storage tank 6, so that the dry powder can be concentratedly output at the bottom of the storage tank 6. The storage tank 6 can adopt a single-tank or multi-tank mode, and the volume of a single tank should meet the polymer dry powder storage requirements for construction of more than one layer (or section).

[0070] like Figure 1-Figure 3 、 Figure 5 、 Figure 6 and Figure 9As shown, the storage assembly 3 includes: a spiral metering device 301, which is fixed to the skid 1; a boiling bin 302, which is fixed to the skid 1, and the boiling bin 302 is connected to a feeding pipe 303, and the feeding pipe 303 is equipped with an external backflush; a powder feed line 304 is connected between the transport tank 201 and the storage tank 6, and the inner diameter of the powder feed line 304 gradually increases from near the transport tank 201 to near the storage tank 6, so that when the dry powder is transported in the powder feed line 304, the flow area through which the dry powder flows gradually increases, reducing the probability of dry powder agglomeration and preventing dry powder from clogging the powder feed line 304, and the powder feed line 304 is equipped with a first electrically controlled valve 305; an exhaust line 306, which is connected to the upper part of the storage tank 6, and the exhaust line 306 is equipped with a dry powder filter 307; a dehumidifier 308, which is installed in the storage tank 6.

[0071] As an optimization, the spiral meter 301 can accurately measure the weight of the output polymer dry powder under normal circumstances with an accuracy of 0.1 kg. An electronic scale (or level meter) can be set to check the spiral meter 301 with the electronic scale (or level meter) to control the feeding speed of the polymer dry powder and ensure that the concentration meets the requirements of construction changes at any time. The electronic scale (or level meter) can accurately weigh the weight or height (volume) of the polymer dry powder in the storage tank 6 for accurate liquid mixing.

[0072] As an optimization, the boiling chamber 302 serves as a mixing and atomizing device for dry air and polymer dry powder, so that the polymer dry powder is suspended in the air, which is convenient for transportation and uniform dispersion, and prevents agglomerated polymer dry powder from entering the feeding pipe 303 and causing uneven mixing.

[0073] As an optimization, the dehumidifier 308 removes moisture from the humid air before it enters the boiling chamber 302 to prevent the entry of humid air and the resulting moisture absorption by the polymer dry powder, which in turn leads to poor atomization of the dry powder.

[0074] As an optimization, the polymer dry powder and air are filtered and separated by the dry powder filter 307. The polymer dry powder is retained in the storage tank 6 after filtration, and the air is discharged from the storage tank 6 to prevent the polymer dry powder from being taken out during exhaust.

[0075] like Figures 1-4 and Figure 9As shown, the mixing assembly 4 includes: a lifting water pump 401, fixedly connected to the skid 1; a second air compressor 402, fixedly connected to the skid 1, and the feed pipe 303 is connected to the second air compressor 402; a liquid adding pump 403, fixedly connected to the skid 1, and the liquid adding pump 403 is connected to a water pipeline 404, which is connected to an external water reservoir with a valve, and the water pipeline 404 is installed with a second pressure gauge 405, a second gate valve 406, a second electric control valve 407 and an electronic flow meter 408; an elevator 409, installed on the skid 1, and the elevator 409 is fixedly connected to a super mixer 410, the lifting water pump 401 is connected to the super mixer 410 through a conduit, the water pipeline 404 is connected to the super mixer 410, the storage tank 6 and the super mixer 410 are connected through the feed pipe 303 and the boiling bin 302, and the feed pipe The inner diameter of the component 303 gradually increases from near the storage tank 6 to near the super mixer 410, so that when the dry powder is transported in the feeding pipe 303, the flow area through which the dry powder flows gradually increases, reducing the probability of dry powder agglomeration while preventing the dry powder from clogging the feeding pipe 303. The skid 1 is equipped with an automatic controller 411 electrically connected to the super mixer 410. The super mixer 410 consists of an ejector, a dry powder jet gun, a disperser, a pressure reducer and a discharge part. The dry powder jet gun is located in the ejector and is matched with the ejector. One end of the dry powder jet gun is a disperser, a pressure reducer and a discharge part, and the discharge part is used to communicate with the external sand mixing tank; the ejector and dry powder jet gun of the super mixer 410 both adopt the slit jet method. The diameter and length of the dry powder jet gun are matched with the ejector to meet the displacement of the lifting pump 401 ≥ 0.6m 3 / min, pressure ≥0.2MPa.

[0076] As an optimization, the first air compressor 202 and the second air compressor 402 are both composed of an air compressor, a cold dryer, a pressure gauge and an air storage tank to prevent wet air from coming into contact with the polymer dry powder and causing it to absorb moisture and agglomerate, and the parameters meet the flow-aiding requirements of the storage tank 6 and the polymer dry powder therein.

[0077] As an optimization, the mixing water is lifted, measured and pressurized by the lifting water pump 401, which is conducive to better dispersion and dissolution of the polymer dry powder. The lifting water pump 401 is usually equipped with two units, one for use and one for backup, with a displacement of ≥100m 3 / h, head: ≥20m.

[0078] As an optimization, the liquid addition pump 403 is used to measure the fracturing fluid additives and spare polymer emulsion online and add them to the sand mixing tank (or dilution tank) in proportion. The liquid addition pump 403 is usually configured with 2-3 units to meet the maximum addition amount of fracturing fluid additives and polymer emulsion (reverse phase, suspension). The usual displacement is: 5m 3 / h or so.

[0079] As an optimization, the height and direction of the super mixer 410 are adjusted by the elevator 409 .

[0080] As an optimization, the automatic controller 411 is a centralized control platform for data collection related to online instant mixing of polymer dry powder fracturing fluid, equipment start and stop, parameter adjustment and control, and other instructions.

[0081] like Figure 1 and Figure 9 As shown, the power assembly 5 includes a generator and a high-voltage cable unit. The first air compressor 202 and the first pressure gauge 205 are electrically connected to the generator through the high-voltage cable unit. The spiral meter 301, the first electrically controlled valve 305 and the dehumidifier 308 are electrically connected to the generator through the high-voltage cable unit. The lift pump 401, the second air compressor 402, the liquid addition pump 403, the second pressure gauge 405, the second electrically controlled valve 407, the electronic flow meter 408, the elevator 409, the super mixer 410 and the automatic controller 411 are electrically connected to the generator through the high-voltage cable unit. The motor of the transmission member 601 is electrically connected to the generator through the high-voltage cable unit.

[0082] As an optimization, the generator and high-voltage cable unit can meet the maximum operating power requirements of the entire equipment, usually configured with 380V / 100KW power, and the opening and closing of all the above-mentioned electric parts can be controlled by the automatic controller 411.

[0083] The specific working principle is as follows:

[0084] When the present device is to be used to produce fracturing fluid, the generator and automatic controller 411 are first connected using a high-voltage cable unit, and then the high-voltage cable units of other components are connected to ensure power supply. The power supply is then turned on. After confirming that the connection is correct, the automatic controller 411 is turned on, and the elevator 409 is started to adjust the height position of the super mixer 410 for ease of operation and stability. The direction is adjusted first, and then the pipeline is connected. After the direction is adjusted, the elevator 409 is stopped and fixed, and then the first air compressor 202 and the second air compressor 402 are started to prepare and store dry air so that the dry air can be taken at any time.

[0085] Before starting to mix the fracturing fluid, check the amount of polymer dry powder using an electronic scale (or level meter). If the amount is less than the amount needed for one layer (or section) of construction, open the first gate valve 204, add polymer dry powder to the storage tank 6 through the delivery pipeline 203, start the first air compressor 202, and deliver the dry powder to the storage tank 6 through compressed air. Before the storage tank 6 is about to be filled with dry powder, close the first gate valve 204 and the first air compressor 202, start the second air compressor 402, and the second air compressor 402 will pump the dry powder in the storage tank 6 into the super mixer 410 through the feeding pipe 303 (slowly start the spiral metering device 301 and gradually increase it to the designed amount, start the boiling chamber 302, and the dry powder and the dry air treated by the dehumidifier 308 will be boiled in the boiling chamber). The dry powder is mixed and atomized in the chamber 302. The atomized dry powder enters the dry powder jet gun of the super mixer 410. Using a slit jet method, the dry powder, water, and gas are fully dispersed, mixed, dissolved, and degassed through the ejector, disperser, and pressure reducer to obtain a concentrated liquid. The dispersion and dissolution status are observed to facilitate timely adjustment of the displacement and pressure. At the same time, the lifting pump 401 and the liquid addition pump 403 are started to lift water from the external water reservoir into the super mixer 410. The fracturing fluid additive is added to the fracturing fluid base liquid in proportion online. The liquid discharge status is monitored by observing the second pressure gauge 405, the second electronically controlled valve 407, and the electronic flow meter 408. When the displacement stabilizes and the pressure reaches the optimal level, the super mixer 410 begins mixing the fracturing fluid.

[0086] When the super mixer 410 starts to mix liquid normally, the external backblower can be turned on to allow the compressed air generated by the external backblower to enter the storage tank 6 through the feeding pipe 303 to assist the flow of the dry powder in the storage tank 6 and keep the dry powder in the storage tank 6 in a loose state.

[0087] When the super mixer 410 finishes mixing the concentrate, the elevator 409 lifts the super mixer 410 to a higher position, so the mixed fracturing fluid in the super mixer 410 can automatically flow into the external sand mixing tank, and be diluted online with water in proportion to form a fracturing fluid base fluid, which is adjusted according to the base fluid viscosity test results.

[0088] 10-20m before the end of construction 3When the amount of liquid is too much, the external backflush is closed by the automatic controller 411, and the speed of the spiral metering device 301 is gradually reduced until the addition of polymer dry powder stops. The boiling chamber 302 is closed, and the residual material in the feeding pipe 303 is sucked out by the second air compressor 402. The dehumidifier 308 and the liquid adding pump 403 are turned off, and the concentrated liquid in the super mixer 410 is squeezed into the external sand mixing tank with liquid water for dilution before use. When the construction is completed, the first air compressor 202, the first pressure gauge 205, the first electric control valve 305, Lift the water pump 401, the second air compressor 402, the second pressure gauge 405, the second electric control valve 407, the electronic flow meter 408, the elevator 409 and the super mixer 410, perform maintenance on the equipment, check the remaining polymer dry powder in the storage tank 6, and replenish the insufficient amount for one layer (or section) in time for the next use, and collect statistics on the amount of polymer dry powder, the amount of fracturing fluid with different concentrations, the amount of fracturing fluid additives, and the fracturing fluid viscosity test data, and generate a report to report to the fracturing construction team to facilitate better fracturing construction.

[0089] like Figure 6-Figure 9 As shown, the vibration component 7 includes: a rotating block 701, two rotating rods fixedly connected to the transmission member 601, the rotating block 701 is fixedly connected to a plurality of elastic telescopic rods 702, the telescopic ends of the elastic telescopic rods 702 are fixedly connected to impact blocks 703, and the front and rear sides of the impact block 703 are both provided with a first inclined surface; there are a plurality of limit blocks 704, which are fixedly connected to the storage tank 6 and are all used to squeeze adjacent impact blocks 703, and the limit blocks 704 are provided with a second inclined surface.

[0090] like Figure 6 As shown, it also includes: a moisture-proof layer 8, which is fixed in the storage tank 6 and is made of a flexible material; an inner liner 9, which is fixed in the moisture-proof layer 8 and surrounds the inner liner 9 but does not wrap the lower side of the inner liner 9. The inner liner 9 is made of an elastic metal material, and the impact block 703 is used to impact the inner liner 9.

[0091] As an optimization, the vibration component 7 impacts the inner liner 9 through the impact block 703, so as to shake off the polymer dry powder adsorbed or compacted on the inner liner 9, thereby facilitating the flow of the polymer dry powder in the storage tank.

[0092] The specific working principle is as follows:

[0093] During the rotation of the two rotating rods on the transmission member 601, the two rotating rods of the transmission member 601 drive the rotating block 701 to rotate, the rotating block 701 drives all the elastic telescopic rods 702 to rotate, and the elastic telescopic rods 702 drive the impact block 703 to rotate. During the rotation process, the impact block 703 first contacts the adjacent limit block 704. The limit block 704 squeezes the adjacent first inclined surface on the adjacent impact block 703 through its second inclined surface, so that the impact block 703 is compressed and squeezes the telescopic end of the elastic telescopic rod 702. The telescopic end of the elastic telescopic rod 702 contracts. When the impact block 70 After rotating until it loses contact with the adjacent limit block 704, the telescopic end of the elastic telescopic rod 702 extends and drives the impact block 703 to move. The impact block 703 moves rapidly and impacts the inner liner 9. If the amount of dry powder in the inner liner 9 is small at this time, the inner liner 9 is shaken by the impact, and the moisture barrier layer 8 is deformed, shaking off the dry powder adhering to the inner wall of the inner liner 9. If the amount of dry powder in the inner liner 9 is large at this time, the dry powder in the inner liner 9 is loosened by vibrating the inner liner 9 to reduce the probability of the dry powder being compacted and agglomerated, and the dry powder adhering to the inner wall of the inner liner 9 is shaken off, thereby improving the accuracy of the dry powder addition when mixing the fracturing fluid.

[0094] like Figures 1-9 As shown, a method for mixing polymer dry powder online instant mixing fracturing fluid is based on the above-mentioned device for mixing polymer dry powder online instant mixing fracturing fluid, and the specific steps are as follows:

[0095] S1: Start the generator of the power assembly 5 to start the first air compressor 202. The polymer dry powder in the transport assembly 2 is carried by the compressed air in the first air compressor 202 and is sealed and transported to the storage assembly 3 through the delivery pipeline 203.

[0096] S2: After the dry powder is temporarily stored in the storage tank 6, the rotating frame 602 is spirally raised and lowered by the transmission member 601, so that pores are formed between the dry powder in the storage tank 6. The rotating frame 602 drives the impact block 703 to rotate through the rotating block 701 and the elastic telescopic rod 702. The impact block 703 is squeezed by the limited block 704 to move, impacting the inner container 9;

[0097] S3: The first electrically controlled valve 305, dry powder filter 307, dehumidifier 308, valve, and spiral metering device 301 of the storage assembly 3 are opened. The polymer dry powder is metered by the spiral metering device 301 and then output. The dry powder is mixed with the dry air treated by the dehumidifier 308 and atomized in the boiling chamber 302. The mixture is then transported through the feed pipe 303 to the dry powder jet gun of the super mixer 410. The gas filtered by the dry powder filter 307 is discharged through the exhaust line 306, leaving the dry powder behind.

[0098] S4: Open the valve of the external water reservoir and slowly start the lifting water pump 401 to empty the water. After the circulation is normal, open the second electronically controlled valve 407. After the readings of the electronic flow meter 408 and the second pressure gauge 405 are stable, the polymer dry powder in the dry powder jet gun on the super mixer 410 is mixed with the pressurized water flow of the ejector. The dry powder, water, and gas are fully dispersed, mixed, dissolved, and degassed through the disperser and pressure reducer to obtain a fully dissolved concentrated solution.

[0099] S5: The concentrate flows automatically by gravity from the discharge portion of the super mixer 410 into the external sand mixing tank, where it is diluted with water in proportion to form the fracturing fluid base fluid, and the concentration is adjusted by viscosity testing;

[0100] S6: Start the liquid adding pump 403, add the fracturing fluid additive according to the proportion, mix it with the fracturing fluid base fluid to prepare the fracturing fluid for use in fracturing construction;

[0101] S7: When the device needs to be stopped, the generator of the power assembly 5 of the device is turned off and the device is cleaned for the next use.

[0102] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for rapidly dissolving polymer dry powder in online fracturing fluid mixing, comprising: A skid (1), wherein a transport component (2), a storage component (3), a mixing component (4) and a power component (5) are provided on the skid (1), wherein the transport component (2) uses compressed air to transport dry powder to the storage component (3), the storage component (3) is used for temporarily storing the dry powder, the mixing component (4) is used for online mixing of the dry powder and the liquid, and the power component (5) is used for providing a power source for the transport component (2), the storage component (3) and the mixing component (4); A storage tank (6) is fixedly connected to the skid seat (1), the storage tank (6) is a fully enclosed structure, a transmission member (601) is installed in the storage tank (6), a rotating frame (602) is provided in the storage tank (6), the transmission member (601) is used to drive the rotating frame (602) to spirally lift, and the rotating frame (602) is provided with inclined sharp portions distributed symmetrically around the center; The dry powder on the upper layer of the inclined sharp portion of the rotating frame (602) moves upward, and pores are formed between the dry powder; a vibration component (7), disposed in the storage tank (6), and configured to vibrate the dry powder in the storage tank (6) when the rotating frame (602) is spirally raised and lowered; The vibration component (7) includes: A rotating block (701) is fixedly connected to the transmission member (601), the rotating block (701) is fixedly connected to a plurality of elastic telescopic rods (702), and the telescopic ends of the elastic telescopic rods (702) are fixedly connected to impact blocks (703); There are a plurality of limit blocks (704), which are fixed to the storage tank (6) and are used to squeeze the adjacent impact blocks (703); A moisture-isolating layer (8) is fixedly connected to the storage tank (6), and the moisture-isolating layer (8) is made of a flexible material; An inner liner (9) is fixedly connected to the moisture-isolating layer (8), the inner liner (9) is made of elastic metal material, and the impact block (703) is used to impact the inner liner (9); The impact block (703) moves and impacts the inner liner (9), causing the inner liner (9) to shake due to the impact, and the moisture-isolating layer (8) to deform; the dry powder on the upper layer of the inclined sharp portion of the movable frame (602) moves upward, and pores are formed between the dry powder.

2. The device for online rapid dissolution of polymer dry powder in fracturing fluid according to claim 1, characterized in that: The transport component (2) comprises: A transport tank (201) is fixedly connected to the skid seat (1), and the transport tank (201) is a fully enclosed structure; A first air compressor (202) is fixedly connected to the skid (1); The delivery pipeline (203) is connected to the transport tank (201) and is also connected to the first air compressor (202). The delivery pipeline (203) is equipped with a first gate valve (204) and a first pressure gauge (205). The inner diameter of the delivery pipeline (203) gradually increases from a position close to the first air compressor (202) to a position close to the transport tank (201).

3. The device for online rapid dissolution of polymer dry powder in fracturing fluid according to claim 2, characterized in that: The storage component (3) includes: A spiral meter (301) is fixedly connected to the skid (1); A boiling bin (302) is fixedly connected to the skid (1), the boiling bin (302) is connected to a feed pipe (303), the feed pipe (303) is equipped with an external backflush, a powder feed line (304) is connected between the transport tank (201) and the storage tank (6), the inner diameter of the powder feed line (304) gradually increases from near the transport tank (201) to near the storage tank (6), and the powder feed line (304) is equipped with a first electric control valve (305); An exhaust pipeline (306) is connected to the upper portion of the storage tank (6), and a dry powder filter (307) is installed on the exhaust pipeline (306); A dehumidifier (308) is installed on the storage tank (6).

4. The device for online rapid dissolution of polymer dry powder in fracturing fluid according to claim 3, characterized in that: The mixing component (4) includes: A lifting water pump (401) is fixedly connected to the skid seat (1); A second air compressor (402) is fixed to the skid seat (1), and the feed pipe (303) is in communication with the second air compressor (402); A liquid adding pump (403) is fixedly connected to the skid seat (1), the liquid adding pump (403) is connected to a water pipeline (404), the water pipeline (404) is connected to an external water reservoir with a valve, and the water pipeline (404) is installed with a second pressure gauge (405), a second gate valve (406), a second electric control valve (407) and an electronic flow meter (408); The lift (409) is mounted on the skid (1). The lift (409) is fixedly connected to a super mixer (410). The lifting water pump (401) is connected to the super mixer (410) through a conduit. The water pipeline (404) is connected to the super mixer (410). The storage tank (6) and the super mixer (410) are connected through the feeding pipe (303) and the boiling chamber (302). The inner diameter of the feeding pipe (303) gradually increases from the position close to the storage tank (6) to the position close to the super mixer (410). The skid (1) is equipped with an automatic controller (411) electrically connected to the super mixer (410).

5. The device for online rapid dissolution of polymer dry powder in fracturing fluid according to claim 4, characterized in that: The super mixer (410) is composed of an ejector, a dry powder jet gun, a disperser, a pressure reducer and a discharge portion. The dry powder jet gun is located in the ejector and is matched with the ejector. One end of the dry powder jet gun is provided with the disperser, the pressure reducer and the discharge portion. The discharge portion is used to communicate with an external sand mixing tank.

6. The device for online rapid dissolution of polymer dry powder in fracturing fluid according to claim 5, characterized in that: The ejector and dry powder jet gun of the super mixer (410) both adopt the slit jet method. The diameter and length of the dry powder jet gun match the ejector to meet the displacement of the lifting water pump (401) ≥ 0.6m 3 / min, pressure ≥0.2MPa.

7. The device for online rapid dissolution of polymer dry powder in fracturing fluid according to claim 6, characterized in that: The power assembly (5) includes a generator and a high-voltage cable unit. The first air compressor (202) and the first pressure gauge (205) are electrically connected to the generator through the high-voltage cable unit. The spiral meter (301), the first electric control valve (305) and the dehumidifier (308) are electrically connected to the generator through the high-voltage cable unit. The lifting water pump (401), the second air compressor (402), the liquid addition pump (403), the second pressure gauge (405), the second electric control valve (407), the electronic flow meter (408), the elevator (409), the super mixer (410) and the automatic controller (411) are electrically connected to the generator through the high-voltage cable unit. The transmission member (601) is electrically connected to the generator through the high-voltage cable unit.

8. A method for mixing polymer dry powder online instant fracturing fluid, comprising the device for mixing polymer dry powder online instant fracturing fluid according to claim 7, comprising the following steps: S1: starting the generator of the power assembly (5) to start the first air compressor (202), and the polymer dry powder in the transport assembly (2) is carried by the compressed air in the first air compressor (202) and transported to the storage assembly (3) through the transport pipeline (203) in a closed manner; S2: After the dry powder is temporarily stored in the storage tank (6), the rotating frame (602) is spirally raised and lowered through the transmission member (601), so that pores are formed between the dry powder in the storage tank (6). The rotating frame (602) drives the impact block (703) to rotate through the rotating block (701) and the elastic telescopic rod (702). The impact block (703) is squeezed by the limited block (704) to move and impact the inner container (9); S3: The first electric control valve (305), dry powder filter (307), dehumidifier (308), valve and spiral meter (301) of the storage component (3) are opened, and the polymer dry powder is metered by the spiral meter (301) and output. The dry powder is mixed with the dry air treated by the dehumidifier (308) and atomized in the boiling bin (302). The dry powder is transported to the dry powder jet gun of the super mixer (410) through the feeding pipe (303). The gas filtered by the dry powder filter (307) is discharged through the exhaust line (306), and the dry powder is retained. S4: Open the valve of the external water reservoir, slowly start the lifting water pump (401) to empty the water, and after the circulation is normal, open the second electric control valve (407). After the readings of the electronic flow meter (408) and the second pressure gauge (405) are stable, the polymer dry powder in the dry powder jet gun on the super mixer (410) is mixed with the ejector pressurized water flow, and the dry powder, water and gas are fully dispersed, mixed, dissolved and degassed through the disperser and the pressure reducer to obtain a fully dissolved concentrated liquid; S5: The concentrated liquid automatically flows from the discharge portion of the super mixer (410) into the external sand mixing tank by gravity, and is diluted with water in proportion to form the fracturing fluid base fluid, and the concentration is adjusted by viscosity testing; S6: Start the liquid adding pump (403), add the fracturing fluid additive according to the proportion, mix it with the fracturing fluid base fluid to prepare the fracturing fluid for use in fracturing construction; S7: When it is necessary to stop using the device, turn off the generator of the power assembly (5) of the device and clean the device for the next use.

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