Polymer dry powder online instant fracturing fluid mixing device and mixing method

Abstract

The invention relates to the technical field of chemical engineering and oil and gas exploitation, in particular to a device and a method for on-line instant dissolving and blending of polymer dry powder and fracturing fluid. Comprising a prying seat, and a transportation assembly, a storage assembly, a mixing assembly and a power assembly are arranged on the prying seat; the storage tank is fixedly connected to the prying seat, the storage tank is provided with a transmission part, a rotating frame is arranged in the storage tank, the transmission part is used for transmitting the rotating frame to spirally ascend and descend, and the rotating frame is provided with inclined sharp parts which are distributed in a central symmetry mode; and the vibration assembly is arranged in the storage tank. The rotating frame rotates and moves upwards along the threaded rod, dry powder on the upper layer of the inclined sharp part of the rotating frame moves upwards, and holes are formed between the dry powder, so that the phenomenon that the lower layer of the dry powder is pressed due to excessive temporary storage of the dry powder is reduced; therefore, the probability that the content of the dry powder in the fracturing fluid is insufficient due to the fact that the dry powder is compacted and cannot be discharged out of the storage tank is reduced, and the quality of the fracturing fluid is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of chemical industry and oil and gas exploitation, and in particular to an online quick-dissolving polymer dry powder mixing and fracturing fluid 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, and 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 developed towards 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 the fracturing efficiency. Due to the limitations of the fracturing well site, overly large equipment is less convenient, so 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] The online mixing technology of polymer emulsion (inverse phase and suspension) has gradually matured and has been widely used in production. However, due to the low effective concentration (≤40%) in polymer emulsion and the presence of solvent oil, dispersant, suspending agent (such as organic soil) and activator, the effect of polymer emulsion is poor. In order to compensate for its poor effect, its usage will increase, which will cause damage to the reservoir and further affect environmental protection production. Storage damage will also affect the life safety of personnel. For this reason, an online instant mixing technology of polymer dry powder is proposed. When mixing the polymer emulsion, the polymer dry powder and water temporarily stored in the storage tank are directly transported to the mixer for mixing and preparing. The online instant mixing technology of polymer dry powder can be used to prepare the concentrate online, and then dilute it with water in proportion to prepare the fracturing fluid. The low-concentration concentrate has good dispersion performance, but the low-concentration concentrate requires a large amount when used and is not stable enough. The high-concentration concentrate has problems such as uneven dispersion, "fish eyes", difficult discharge, and large dust caused by artificial feeding.

[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 due to 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 subsequently stored dry powder is mixed with the accumulated dry powder and participates in subsequent mixing, resulting in excessively high concentration of the subsequently produced fracturing fluid. The above two situations will lead to unstable production concentration of the fracturing fluid, which will affect the effect of the 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 polymer dry powder online instant mixing fracturing fluid device, comprising: A skid, on which a transport component, a storage component, a mixing component and a power component are arranged. The transport component uses compressed air to transport dry powder to the storage component. The storage component is used to temporarily store dry powder. The mixing component is used to mix dry powder and liquid online. The power component is used to provide a power source for the transport component, the storage component and the mixing component. 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 arranged inside the storage tank, the transmission member is used to drive the rotating frame to spirally lift, and the rotating frame is provided with inclined sharp parts distributed symmetrically around the center; 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 is spirally lifted.

[0008] Furthermore, the transport component comprises: A transport tank is fixedly connected to the skid, and the transport tank is a fully enclosed structure; A first air compressor is fixedly connected to the skid; 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.

[0009] Furthermore, the storage component includes: A spiral meter, fixedly connected to the skid; 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 blowback device, a powder feed pipeline is connected between the transport tank and the storage tank, the inner diameter of the powder feed pipeline gradually increases from close to the transport tank to close to the storage tank, and the powder feed pipeline is equipped with a first electric control valve; an exhaust pipeline connected to the upper part of the storage tank, wherein the exhaust pipeline is equipped with a dry powder filter; A dehumidifier is installed on the storage tank.

[0010] Further, the mixing component includes: A lifting water pump, fixedly connected to the skid; A second air compressor is fixedly connected to the skid, and the feed pipe is in communication with the second air compressor; A liquid adding pump is fixedly connected to the skid, the liquid adding pump is connected to a water pipeline, the water pipeline is connected to an external water reservoir with a valve, and the water pipeline is installed with a second pressure gauge, a second gate valve, a second electric control valve and an electronic flow meter; A lift is installed on the skid, the lift is fixedly connected with a super mixer, the lifting water pump is connected with the super mixer through a conduit, the water pipeline is connected with the super mixer, the storage tank is connected with the super mixer through the feeding pipe and the boiling bin, the inner diameter of the feeding pipe gradually increases from the position close to the storage tank to the position close to the super mixer, and the skid is equipped with an automatic controller electrically connected with the super mixer.

[0011] Furthermore, the super mixer is composed 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.

[0012] Furthermore, the ejector of the super mixer and the dry powder ejector gun both adopt the slit ejection method, and the diameter and length of the dry powder ejector 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.

[0013] 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 electric control valve and the dehumidifier are electrically connected to the generator through the high-voltage cable unit, the lifting water pump, the second air compressor, the liquid addition pump, the second pressure gauge, the second electric control 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.

[0014] Further, the vibration component includes: A rotating block is fixedly connected to the transmission member, 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; There are several limit blocks, which are fixedly connected to the storage tank and are used to squeeze the adjacent impact blocks.

[0015] Furthermore, it also includes: A moisture-proof layer, fixedly connected to the storage tank, wherein the moisture-proof layer is made of a flexible material; The inner liner is fixed in the moisture-isolating layer. The inner liner is made of elastic metal material. The impact block is used to impact the inner liner.

[0016] A method for mixing polymer dry powder online fast-dissolving fracturing fluid is based on the above-mentioned device for mixing polymer dry powder online fast-dissolving fracturing fluid, and the specific steps are as follows: S1: Start the generator of the power component to start the first air compressor, and the polymer dry powder in the transport component is carried by the compressed air in the first air compressor and transported to the storage component through the conveying pipeline in a closed manner; S2: After the dry powder is temporarily stored in the storage tank, the rotating frame is spirally lifted 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; S3: Open the first electric control valve, dry powder filter, dehumidifier, valve and spiral meter of the storage component, the polymer dry powder is metered by the spiral meter and then output, the dry powder is mixed and atomized with the dry air treated by the dehumidifier in the boiling bin, and is transported to the dry powder jet gun of the super mixer through the feeding pipe, and the gas filtered by the dry powder filter is discharged through the exhaust pipeline, and the dry powder is retained; S4: Open the valve of the external water reservoir, slowly start the lifting water pump to empty it, and after the circulation is normal, open the second electric control valve, and 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 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 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, and the concentration is adjusted by viscosity detection; S6: Start the liquid adding pump, 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 of the device and clean the device for the next use.

[0017] The beneficial effects of the present invention are as follows: 1. 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 is compacted due to excessive temporary storage of dry powder, 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, so as to ensure the quality of the fracturing fluid; 2. By mixing the polymer dry powder with the fracturing fluid online, the mixture is evenly dispersed, fully dissolved, and free of "fish eyes". The height of the super mixer is adjusted by a lift so that the fracturing fluid can automatically flow to the external sand mixing tank after mixing. This solves the problem of concentrated liquid pumping. The transportation, storage, and mixing of dry powder are automated, fully enclosed, and dust-free, which reduces the labor intensity of workers, reduces dust and packaging pollution, and is clean and environmentally friendly. 3. The slit jet method is adopted. 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 the pressure reducer, the mixing can be more uniform and the dissolution speed can be faster. After the concentrated liquid is diluted in proportion and the additives are added, the required concentration of fracturing fluid can be prepared, which greatly improves the mixing efficiency; 4. By turning on the external backflush, the compressed air generated by the external backflush 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, so as to prevent 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; 5. By setting the inner diameter of the pipeline through which the dry powder flows, the flow area through which 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, affects the quality of the fracturing fluid, and even causes pipeline blockage; 6. Impact the inner liner with an impact block. If there is less dry powder in the inner liner, the inner liner will shake due to the impact, and the moisture barrier layer will deform, and the dry powder adhering to the inner wall of the inner liner will be shaken off. If there is more dry powder in the inner liner at this time, the dry powder in the inner liner 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 inner liner will be shaken off to improve the accuracy of the amount of dry powder added when mixing the fracturing fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments are briefly introduced below. 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 paying any creative work.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the super mixer of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the storage tank of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of the water lifting pump and the liquid adding pump of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the dehumidifier of the present invention; Figure 6 It is a three-dimensional structural cross-sectional view of the storage tank, the moisture-insulating layer and the inner liner of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the impact block and the limit block of the present invention; Figure 8 It is a three-dimensional structural cross-sectional view of the elastic telescopic rod of the present invention; Fig. 9 It is a system diagram of the present invention.

[0020] Markings in the accompanying 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 meter, 302: boiling bin, 303: feed pipe, 304: powder inlet pipeline, 305: first electric control valve, 306: exhaust pipeline, 307: dry powder filter, 308: dehumidifier, 4: mixing assembly, 401: lifting pump, 402: second Air compressor, 403: liquid adding 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 insulation layer, 9: liner. DETAILED DESCRIPTION

[0021] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0022] 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 multi-tank, and can be vehicle-mounted or skid-mounted, for flexible operation.

[0023] A polymer dry powder online instant mixing fracturing fluid device, such as Figure 1-Figure 9As 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 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 to provide a power source for the transport component 2, the storage component 3 and the mixing component 4; a storage tank 6, which is fixedly connected to the skid 1, the storage tank 6 is a fully enclosed structure, and the storage tank 6 is installed with a transmission member 601, and the transmission member 601 consists of a motor, a threaded rod, a rotating disk and two rotating rods, wherein the motor is fixedly connected to the storage tank 6, and the threaded rod is fixedly connected 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 arranged 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 at the center; the vibration component 7 is arranged 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.

[0024] As an optimization, the polymer dry powder in this embodiment is a quick-dissolving 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.

[0025] 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.

[0026] The specific working principle is as follows: 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 1 The 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 rod, so that the dry powder located on the upper layer of the inclined sharp portion of the rotating frame 602 moves upward, and pores are formed between the dry powders to reduce the phenomenon that the lower layer is compacted due to excessive temporary storage of dry powder.

[0027] 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, and the inclined sharp part at the bottom of the rotating frame 602 is inserted into the dry powder layer by layer. With the rotation of the rotating frame 602, the dry powder is separated layer by layer from top to bottom, so that the dry powder in the storage tank 6 is constantly turned over, reducing the probability of dry powder agglomeration in the storage tank 6, 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 6, thereby ensuring the quality of the fracturing fluid produced subsequently.

[0028] When the device is not in use, the motor of the transmission member 601 can be turned off through the external terminal.

[0029] like Figure 1 , Figure 2 and Fig. 9 As shown, the transport component 2 includes: a transport tank 201, which is fixed to the skid 1, and the transport tank 201 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, and 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 where the dry powder flows through gradually increases, thereby preventing the dry powder from being restricted by the delivery pipeline 203 during the transportation process 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.

[0030] 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 the dry powder adhering to the storage tank 6, so that the dry powder can be centrally 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 storage requirements for the amount of polymer dry powder for construction of more than one layer (or section).

[0031] like Figure 1-Figure 3 , Figure 5 , Figure 6 and Fig. 9As shown, the storage assembly 3 includes: a spiral metering device 301, which is fixedly connected to the skid 1; a boiling bin 302, which is fixedly connected 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 inlet pipeline 304 is connected between the transport tank 201 and the storage tank 6, and the inner diameter of the powder inlet pipeline 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 inlet pipeline 304, the flow area where the dry powder flows through gradually increases, reducing the probability of dry powder agglomeration and preventing the dry powder from clogging the powder inlet pipeline 304, and the powder inlet pipeline 304 is equipped with a first electric control valve 305; an exhaust pipeline 306, which is connected to the upper part of the storage tank 6, and the exhaust pipeline 306 is equipped with a dry powder filter 307; a dehumidifier 308, which is installed in the storage tank 6.

[0032] 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 polymer dry powder feeding speed 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 preparation.

[0033] As an optimization, the boiling chamber 302 is used 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.

[0034] As an optimization, the dehumidifier 308 removes moisture from the humid air before it enters the boiling chamber 302 to prevent the humid air from entering and causing the polymer dry powder to absorb moisture, resulting in poor atomization of the dry powder.

[0035] As an optimization, the polymer dry powder and air are filtered and separated by the dry powder filter 307, and the polymer dry powder is retained in the storage tank 6 after filtration, while the air is discharged from the storage tank 6 to prevent the polymer dry powder from being taken out during exhaust.

[0036] like Figure 1-Figure 4 and Fig. 9As shown, the mixing assembly 4 includes: a lifting water pump 401, which is fixedly connected to the skid 1; a second air compressor 402, which is fixedly connected to the skid 1, and the feed pipe 303 is connected to the second air compressor 402; a liquid adding pump 403, which is fixedly connected to the skid 1, and the liquid adding pump 403 is connected to a water pipeline 404, and 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; a lift 409, which is installed on the skid 1, and 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 is connected to the super mixer 410 through the feed pipe 303 and the boiling bin 302, and the feed pipe The inner diameter of the component 303 gradually increases from the position near the storage tank 6 to the position near the super mixer 410, so that when the dry powder is transported in the feeding pipe 303, the flow area where the dry powder flows gradually increases, reducing the probability of dry powder agglomeration and 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 ejector gun, a disperser, a pressure reducer and a discharge part. The dry powder ejector gun is located in the ejector and is matched with the ejector. One end of the dry powder ejector gun is a disperser, a pressure reducer and a discharge part, and the discharge part is used to communicate with an external sand mixing tank; the ejector and the dry powder ejector gun of the super mixer 410 both adopt the slit jet method, and the diameter and length of the dry powder ejector gun are matched with the ejector to meet the displacement of the lifting pump 401 ≥ 0.6m 3 / min, pressure ≥0.2MPa.

[0037] 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 contacting 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.

[0038] As an optimization, the mixing water is lifted, metered, 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.

[0039] As an optimization, the liquid adding 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 adding 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.

[0040] As an optimization, the height and direction of the super mixer 410 are adjusted by the elevator 409 .

[0041] As an optimization, the automatic controller 411 is a centralized control platform for the collection of relevant data of the polymer dry powder online instant mixing fracturing fluid, the start and stop of the equipment, parameter adjustment and control and other instructions.

[0042] like Figure 1 and Fig. 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 electric control valve 305 and the dehumidifier 308 are electrically connected to the generator through the high-voltage cable unit. The lifting pump 401, the second air compressor 402, the liquid adding 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 motor of the transmission member 601 is electrically connected to the generator through the high-voltage cable unit.

[0043] As an optimization, the generator and high-voltage cable line unit can meet the maximum operating power requirements of the entire set of 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.

[0044] The specific working principle is as follows: When it is necessary to use the present device to produce fracturing fluid, firstly, the generator and the automatic controller 411 are connected by a high-voltage cable unit, and then the high-voltage cable units of other parts are connected to ensure power supply, and then the power is 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 used at any time.

[0045] Before mixing the fracturing fluid, check the amount of polymer dry powder by electronic scale (or level meter). If the amount is less than one layer (or section) of construction material, 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 extracts the dry powder in the storage tank 6 through the feeding pipe 303 into the super mixer 410 (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 are boiled in the boiling chamber. The dry powder is mixed and atomized in the bin 302, and the atomized dry powder enters the dry powder jet gun of the super mixer 410. The slit jet method is adopted to fully disperse, mix, dissolve, and degas the dry powder, water, and gas through the ejector, disperser, and pressure reducer. The concentrated liquid is obtained by mixing, and the dispersion and dissolution conditions are observed so as to adjust the displacement and pressure in time. At the same time, the lifting water pump 401 and the liquid adding pump 403 are turned on to lift the water in the external water reservoir into the super mixer 410, and the fracturing fluid additive is added to the fracturing fluid base liquid online in proportion. The liquid discharge condition is known by observing the second pressure gauge 405, the second electric control valve 407, and the electronic flow meter 408. When the displacement is stable and the pressure reaches the optimal level, the super mixer 410 starts to mix the fracturing fluid.

[0046] 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 feed 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.

[0047] When the super mixer 410 finishes mixing the concentrate, the elevator 409 lifts the super mixer 410 to a high position, so the mixed fracturing fluid in the super mixer 410 can automatically flow to the external sand mixing tank, and be diluted online with water in proportion to become a fracturing fluid base fluid, which is adjusted according to the base fluid viscosity detection result.

[0048] 10-20m before the end of construction 3When the amount of liquid is increased, the external backflush is closed through 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 bin 302 is closed, the remaining material in the feeding pipe 303 is sucked clean 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 amount of polymer dry powder in the storage tank 6, and replenish the insufficient amount of one layer (or section) in time for the next use, and count the amount of polymer dry powder, the preparation amount of fracturing fluid of different concentrations, the amount of fracturing fluid additives, and the fracturing fluid viscosity test data, and form a report to report to the fracturing construction team for better fracturing construction.

[0049] 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 with a plurality of elastic telescopic rods 702, the telescopic ends of the elastic telescopic rods 702 are fixedly connected with 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.

[0050] like Figure 6 As shown, it also includes: a moisture-proof layer 8, which is fixedly connected to the storage tank 6, and the moisture-proof layer 8 is made of a flexible material; an inner liner 9, which is fixedly connected to the moisture-proof layer 8, and the moisture-proof layer 8 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.

[0051] As an optimization, the vibration component 7 impacts the inner liner 9 through the impact block 703 to shake off the polymer dry powder adsorbed or compacted on the inner liner 9, which helps the flow of the polymer dry powder in the storage tank.

[0052] The specific working principle is as follows: 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, the elastic telescopic rods 702 drive the impact block 703 to rotate, and the impact block 703 first contacts the adjacent limit block 704 during the rotation process, and 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, and the telescopic end of the elastic telescopic rod 702 contracts. After rotating until it loses contact with the adjacent limit block 704, the telescopic end of the elastic telescopic rod 702 extends out and drives the impact block 703 to move, and the impact block 703 moves quickly 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-isolating layer 8 is deformed, and the dry powder adhering to the inner wall of the inner liner 9 is shaken off. 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 to improve the accuracy of the amount of dry powder added when mixing the fracturing fluid.

[0053] like Figure 1-Figure 9 As shown, a method for mixing a polymer dry powder online instant mixing fracturing fluid is based on the above-mentioned device for mixing a polymer dry powder online instant mixing fracturing fluid, and the specific steps are as follows: 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 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 lifted 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, the dry powder filter 307, the dehumidifier 308, the valve and the 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 and atomized with the dry air treated by the dehumidifier 308 in the boiling bin 302, and is transported into the dry powder jet gun of the super mixer 410 through the feeding pipe 303, and the gas filtered by the dry powder filter 307 is discharged through the exhaust pipeline 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 it, and after the circulation is normal, open the second electric control valve 407, and 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 into the external sand mixing tank from the discharge part of the super mixer 410 by gravity, and is diluted with water in proportion to form the fracturing fluid base fluid, and the concentration is adjusted by viscosity detection; 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 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.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A polymer dry powder online instant mixing fracturing fluid device, characterized in that it comprises: A skid (1), wherein a transport component (2), a storage component (3), a mixing component (4) and a power component (5) are arranged 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 to temporarily store the dry powder, the mixing component (4) is used to mix the dry powder and 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 fixedly connected to the skid seat (1), the storage tank (6) is a fully enclosed structure, a transmission member (601) is installed on the storage tank (6), a rotating frame (602) is arranged inside 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 parts distributed symmetrically around the center; a vibration component (7) disposed in the storage tank (6) and used to vibrate the dry powder in the storage tank (6) when the rotating frame (602) is spirally lifted; The vibration component (7) comprises: 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) fixedly connected to the storage tank (6), each of which is used to squeeze the adjacent impact blocks (703).

2. The device for online quick dissolving and mixing fracturing fluid with polymer dry powder 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 seat (1); The delivery pipeline (203) is connected to the transport tank (201) and 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 quick dissolving and mixing fracturing fluid with polymer dry powder according to claim 2, characterized in that: The storage component (3) comprises: A spiral meter (301) fixedly connected to the skid seat (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 blowback device; 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 a position close to the transport tank (201) to a position close to 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 part 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 quick dissolving and mixing fracturing fluid with polymer dry powder according to claim 3, characterized in that: The mixing component (4) comprises: A lifting water pump (401) fixedly connected to the skid seat (1); A second air compressor (402) is fixedly connected 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 (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; 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) via a conduit. The water pipeline (404) is connected to the super mixer (410). The storage tank (6) is connected to the super mixer (410) via the feed pipe (303) and the boiling chamber (302). The inner diameter of the feed 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 quick dissolving and mixing fracturing fluid with polymer dry powder 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 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 the disperser, the pressure reducer and the discharge part. The discharge part is used to communicate with an external sand mixing tank.

6. The device for online quick dissolving and mixing fracturing fluid with polymer dry powder according to claim 5, characterized in that: The ejector and dry powder ejector gun of the super mixer (410) both adopt the slit ejection method. The diameter and length of the dry powder ejector 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 quick dissolving and mixing fracturing fluid with polymer dry powder 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 both electrically connected to the generator via the high-voltage cable unit. The spiral meter (301), the first electric control valve (305) and the dehumidifier (308) are both electrically connected to the generator via the high-voltage cable unit. The lifting water pump (401), the second air compressor (402), the liquid adding pump (403), the second pressure gauge (405), the second electric control valve (407), the electronic flow meter (408), the lift (409), the super mixer (410) and the automatic controller (411) are both electrically connected to the generator via the high-voltage cable unit. The transmission member (601) is electrically connected to the generator via the high-voltage cable unit.

8. The device for online quick dissolving and mixing fracturing fluid with polymer dry powder according to claim 7, characterized in that: Also included are: 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; The inner liner (9) is fixedly connected to the moisture-isolating layer (8); the inner liner (9) is made of an elastic metal material; and the impact block (703) is used to impact the inner liner (9).

9. A method for mixing polymer dry powder online instant mixing fracturing fluid, according to the device for mixing polymer dry powder online instant mixing fracturing fluid according to claim 8, the specific steps are as follows: S1: starting the generator of the power component (5) to start the first air compressor (202), so that the polymer dry powder in the transport component (2) is carried by the compressed air in the first air compressor (202) and is transported to the storage component (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), and the rotating frame (602) drives the impact block (703) to rotate through the rotating block (701) and the elastic telescopic rod (702), and the impact block (703) is squeezed by the restricted block (704) to move, thereby impacting the inner container (9); S3: The first electric control valve (305), the dry powder filter (307), the dehumidifier (308), the valve and the spiral metering device (301) of the storage component (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 bin (302), and is transported to the dry powder jet gun of the super mixer (410) through the feeding pipe (303), and the gas filtered by the dry powder filter (307) is discharged through the exhaust pipeline (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), and 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 into the external sand mixing tank from the discharge part of the super mixer (410) by gravity, and is diluted with water in proportion to form a fracturing fluid base fluid, and the concentration is adjusted by viscosity detection; 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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