Long fiber automatic filling device for oil and gas fracturing and filling method thereof

Abstract

The application discloses an automatic long fiber filling device for oil and gas fracturing and a filling method thereof, and belongs to the technical field of oil and gas fracturing. The automatic long fiber filling device comprises a skid-mounted box body and a long fiber mounting rack, a fiber surface treatment machine, a fiber cutting machine, a stirring tank, a clean water pump and a conveying pump which are arranged in the skid-mounted box body. The outlet of the clean water pump is communicated with the upper end of the stirring tank, and the inlet of the conveying pump is communicated with the bottom of the stirring tank. The outlet of the fiber cutting machine is located above the fiber feeding port on the top of the stirring tank, and the fiber cut by the fiber cutting machine directly enters the stirring tank from the fiber feeding port. The long fiber mounting rack and the fiber surface treatment machine are sequentially arranged on one side of the fiber cutting machine. The device can realize on-site cutting of long fibers, adjustable length of fibers, proportional and uniform combination of fibers of different types and specifications, rapid mixing of fibers and clean water, real-time adjustment of fiber addition amount according to sand concentration, uniform mixing of fibers and fracturing fluid, and embodies the functions and values of fiber sand carrying and temporary plugging.

Description

TECHNICAL FIELD

[0001] The application relates to an automatic long fiber filling device for oil and gas fracturing and a filling method thereof, and belongs to the technical field of oil fracturing. BACKGROUND

[0002] The fiber has two functions when being filled during oil and gas fracturing: (1) the sand-carrying and sand-preventing capacity of the fiber in the fracturing fluid can effectively prevent the proppant from flowing back and returning out of the reservoir fracture network; and (2) the temporary plugging fiber added in the fracturing process can achieve the effect of plugging old fractures and opening new fractures, and both functions can effectively improve the oil and gas production of a single well. The following three problems need to be solved in the application process of the technology.

[0003] Different lengths of fibers have different sand-carrying, sand-preventing and temporary plugging effects, and the fiber length is difficult to adjust in real time during the construction process; the fiber has a light bulk specific gravity and is not easy to disperse, and in the fracturing fluid with viscosity, the fiber is prone to agglomeration and uneven mixing, and in severe cases, sand plugging may affect the fracturing construction; the fiber addition amount is mainly related to the sand ratio in the fracturing process, and the fiber addition amount must be accurately and real-timely adjusted according to the sand ratio. Different types of fibers have different performance effects, but the finished fibers are difficult to uniformly mixed together.

[0004] The current fracturing fiber adding method is to cut the finished short fibers of a certain length through the principle of pneumatic conveying, hydraulic jet suction and pre-mixing of the fracturing fluid, and then convey the fibers to the sand mixing truck.

[0005] The Chinese patent application with the publication number CN103640897A discloses a fiber material conveying device. The fiber material conveying device disclosed in the application uses a spiral to quantitatively convey the fiber, air to blow and convey the fiber, and a cyclone separator to separate the gas and the material. The device uses the spiral to quantitatively convey the fiber, which is a volume measurement method, and the fiber is easily compressed, so the measurement accuracy is low; the air blowing, conveying and separating method must use a special equipment crane to assist the hoisting of the cyclone separator, and the fiber is easily suspended in the fracturing fluid with viscosity and is difficult to quickly and uniformly mix with the fracturing fluid; the blown dry fiber is easily blown around.

[0006] The Chinese patent application with the publication number CN106121615A discloses a fiber filling device for oil field fracturing and a filling method thereof. The fiber filling device disclosed in the application uses the negative pressure generated by hydraulic jet suction to quantitatively convey the fiber through a spiral, mixes the fiber in the pipeline and then conveys the fiber to the fracturing. The hydraulic jet suction principle has different efficiencies for the bulky fiber and is prone to block the fiber inlet.

[0007] The utility model discloses a CN214532921U discloses a kind of for shale gas horizontal well fracturing sand prevention fibrous automatic injection system.The system is metered to fiber by self-weight reduction type quantitative control, disperses, pneumatic conveying, fiber and fracturing fluid pre-mixing, mixing, conveying to sand mixing truck mixing tank.The self-weight reduction type fiber metering of the system exists batch gap work;Cannot real-time and fracturing sand concentration carry out fiber addition amount matching, need to set the addition amount of fiber in different stages.

[0008] In summary, the current oil and gas fracturing fiber injection device still has some problems, and cannot fully meet the increasingly accurate fracturing operation needs. SUMMARY

[0009] In order to overcome the problems in the prior art, the present application provides a long fiber automatic injection device for oil and gas fracturing and an injection method thereof. The device can realize on-site cutting of long fibers, adjustable fiber length, uniform combination of fibers of different models and specifications in proportion, rapid mixing of fibers and clean water, real-time adjustment of fiber addition amount according to sand concentration, and ensures uniform mixing of fibers and fracturing fluid and reflects the role and value of fiber sand carrying and temporary plugging.

[0010] The technical scheme provided by the present application to solve the above technical problems is: a long fiber automatic injection device for oil and gas fracturing, comprising a skid-mounted box body and a long fiber mounting rack, a fiber surface treatment machine, a fiber cutting machine, a mixing tank, a clean water pump and a conveying pump installed in the skid-mounted box body.

[0011] The outlet of the clean water pump is communicated with the upper end of the mixing tank, and the inlet of the conveying pump is communicated with the bottom of the mixing tank. The outlet of the fiber cutting machine is located above the fiber feeding port at the top of the mixing tank, and the fibers cut by the fiber cutting machine directly enter the mixing tank from the fiber feeding port.

[0012] The long fiber mounting rack and the fiber surface treatment machine are sequentially located on one side of the fiber cutting machine, and the fiber on the long fiber mounting rack is conveyed to the fiber cutting machine for cutting by the fiber surface treatment machine.

[0013] Further technical solutions are that the skid-mounted box body has a storage rack, and the fiber surface treatment machine and the fiber cutting machine are fixed on the storage rack.

[0014] Further technical solutions are that the long fiber mounting rack is provided with a long fiber mounting core shaft, and a reel type long fiber yarn ball is horizontally mounted on the long fiber mounting core shaft.

[0015] Further technical solutions are that the long fiber mounting core shaft is provided with a gravity lock pin for preventing the reel type long fiber yarn ball from falling.

[0016] Further technical solutions are that the fiber surface treatment machine comprises a treatment frame, a belt, a motor and a roller installed on the treatment frame, the motor drives the roller to rotate through the belt, the treatment frame is internally provided with a storage tank filled with treatment liquid, and the lower half of the roller is immersed in the treatment liquid.

[0017] Further technical solutions are that the stirring tank comprises a tank body and an ultrasonic mixer, a liquid level meter and a stirring motor installed on the tank body, the bottom of the tank body is provided with a liquid outlet, and the top is provided with a fiber feeding port; a first layer of paddles and a second layer of paddles are sequentially arranged on the stirring shaft of the stirring motor.

[0018] Further technical solutions are that the inner wall of the stirring tank is provided with an inclined baffle.

[0019] Further technical solutions are that the fiber feeding port is provided with an expanded nozzle spraying device, the expanded nozzle spraying device comprises an inlet flange and an outlet flange connected in sequence, and the bottom of the outlet flange is provided with a spraying plate with spraying holes.

[0020] Further technical solutions are that the inside of the skid-mounted tank body is provided with an automatic control device and a generator set, the top is provided with lifting lugs and a lighting system.

[0021] An automatic long fiber filling method for oil and gas fracturing, specifically comprising the following steps:

[0022] S1, different models, specifications and quantities of fiber bundles are installed on the long fiber mounting frame, and one end of the fiber bundle is placed on the fiber surface treatment machine;

[0023] S2, the fiber filling amount is calculated according to the long fiber specifications, bundle number and long fiber speed;

[0024] S3, then start the fiber surface treatment machine, the fiber cutting machine, the stirring tank, the water pump and the conveying pump;

[0025] S4, the fiber bundle on the long fiber mounting frame is conveyed to the fiber cutting machine (4) through the roller immersed in the treatment liquid, and the cut fiber enters the stirring tank from the fiber feeding port;

[0026] S5, at the same time, the water pump sends clean water to the stirring tank, and then the fiber and the clean water are mixed through the fiber ultrasonic mixer and the stirring motor (6-8);

[0027] S6, the mixed solution is conveyed to the mixing tank of the sand mixing truck by the conveying pump.

[0028] The present application has the following beneficial effects:

[0029] I. The device as a whole is completely suitable for long-term independent operation in the field with a power supply, and is suitable for oil and gas fracturing sites.

[0030] II. By directly using long fiber yarn on-site cutting, the fiber cutting process is integrated into the filling device, which reduces the processing cost of the fiber, and all fiber filling devices do not have this function.

[0031] III. The fiber metering generally adopts volume and weighing method, and the fiber volume is easily compressed, so the volume method has large measurement error; the weighing method is suitable for batch metering and cannot be continuously metered, the utility model adopts fiber specification (denier) * fiber bundle number * fiber speed calculation, which can be continuously metered and accurately metered.

[0032] IV. Different models of long fiber yarn can be installed to cut mixed and uniform combined fibers, which is a function that the existing fiber filling device cannot achieve.

[0033] V. The fiber stirring tank adopts an expanded port water spraying port, a combined stirrer and special baffle plates to quickly and uniformly mix the fiber and clean water on line.

[0034] VI. The automatic control device automatically controls the fiber addition amount by collecting fracturing data, so as to adjust the fiber addition amount in real time according to the sand concentration. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is the main view schematic diagram of the structure of the device of the present application;

[0036] Figure 2 is the main view schematic diagram of the structure of the device of the present application;

[0037] Figure 3 is the main view schematic diagram of the structure of the device of the present application;

[0038] Figure 4 is the main view schematic diagram of the surface treatment machine of the device of the present application;

[0039] Figure 5 is the main view schematic diagram of the surface treatment machine of the device of the present application;

[0040] Figure 6 is the main view schematic diagram of the stirring tank of the device of the present application;

[0041] Figure 7 is the main view schematic diagram of the stirring tank of the device of the present application;

[0042] Figure 8 is the main view schematic diagram of the expanded port spraying device of the device of the present application;

[0043] Figure 9 is the main view schematic diagram of the expanded port spraying device of the device of the present application;

[0044] The diagram is labeled as follows: 1-Long fiber mounting rack; 2-Storage room; 3-Fiber surface treatment machine; 4-Fiber cutting machine; 5-Clean water pump; 6-Mixing tank; 7-Transfer pump; 8-Automatic control device; 9-Generator set; 10-Lifting lug; 11-Lighting system; 12-Skimmed enclosure; 3-1 Motor; 3-2 Processing liquid; 3-3 Roller; 3-4 Fiber; 6-1 Inclined baffle; 6-2 Flange spray device; 6-3 Ultrasonic mixer; 6-4 Liquid outlet; 6-5 First layer impeller; 6-6 Second layer impeller; 6-7 Level gauge; 6-8 Agitator motor; 6-2-1 Spray plate; 6-2-2 Outlet flange; 6-2-3 Inlet flange. Detailed Implementation

[0045] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] like Figures 1-3 As shown, an automatic long fiber injection device for oil and gas fracturing according to the present invention includes a skid-mounted housing 12 and a long fiber mounting frame 1, a fiber surface treatment machine 3, a fiber cutting machine 4, a mixing tank 6, a clean water pump 5, a delivery pump 7, an automatic control device 8, a generator set 9, lifting lugs 10, and a lighting system 11 installed inside the skid-mounted housing 12; the skid-mounted housing 12 has a storage rack 2, and the fiber surface treatment machine 3 and the fiber cutting machine 4 are both fixed on the storage rack 2;

[0047] The skid-mounted enclosure 12 has doors on all four sides, and the generator set 9 is a separate compartment. Its structure facilitates inspection and maintenance, and provides vibration isolation and noise reduction.

[0048] The outlet of the water pump 5 is connected to the upper end of the mixing tank 6, and the inlet of the conveying pump 7 is connected to the bottom of the mixing tank 6; the outlet of the fiber cutter 4 is located above the fiber feed inlet at the top of the mixing tank 6, and the fibers cut by the fiber cutter 4 directly enter the mixing tank 6 from the fiber feed inlet.

[0049] The long fiber mounting frame 1 and the fiber surface treatment machine 3 are located on one side of the fiber cutting machine 4. The fiber surface treatment machine 3 transports the fibers on the long fiber mounting frame 1 into the fiber cutting machine 4 for cutting.

[0050] As a further description of the above embodiments, the long fiber mounting frame 1 is provided with a long fiber mounting mandrel, on which a roll of long fiber filaments is horizontally mounted, and the long fiber mounting mandrel is provided with a gravity locking pin to prevent the roll of long fiber filaments from falling off.

[0051] As Figure 4 And 5 In the preferred embodiment of the fiber surface treatment machine 3 in the above embodiment, the fiber surface treatment machine 3 comprises a treatment frame, a belt, and a motor 3-1 mounted on the treatment frame, two parallel rollers 3-3 driven to rotate by the belt, and a storage tank 3-2 containing treatment liquid in the treatment frame, and the lower half of the roller 3-3 is immersed in the treatment liquid; the amount of treatment liquid on the surface of the long fiber can be controlled by adjusting the rotation speed of the roller 3-3.

[0052] As Figure 6 And 7 In the preferred embodiment of the stirring tank 6 in the above embodiment, the stirring tank 6 comprises a tank body, an ultrasonic mixer 6-3 mounted on the tank body, a liquid level gauge 6-7, and a stirring motor 6-8, the bottom of the tank body is provided with a liquid outlet 6-4, and the top is provided with a fiber feeding port; the stirring shaft of the stirring motor 6-8 is sequentially provided with a first layer of paddles 6-5 and a second layer of paddles 6-6, and the inner wall of the stirring tank 6 is provided with 3-6 evenly distributed inclined baffles 6-1. The stirring paddle of the stirring tank 6 is a combined paddle with a two-layer structure, the first layer is 2-6 straight-blade paddles, and the second layer is 2-4 inclined paddles, the angle of the inclined paddles with the axis is r1=50° (the paddle rotates clockwise), and the combined paddle is particularly suitable for mixing and stirring of fibers and clean water, and the baffles are inclined in the clockwise direction with an angle of r2=10-25°.

[0053] As Figure 8 And 9 In the preferred embodiment of the fiber surface treatment machine 3 in the above embodiment, the fiber feeding port is provided with a flared spraying device 6-2, the flared spraying device 6-2 comprises an inlet flange 6-2-3 and an outlet flange 6-2-2 connected in series, and the bottom of the outlet flange 6-2-2 is provided with a spraying plate 6-2-1 with spraying holes. The flared angle r 3 =40-50°, and the spraying hole area is 85-95% of the cross-sectional area of the clean water pipe. The flared spraying port can quickly soak the fibers, making the fibers more easily dissolved in clean water.

[0054] An automatic long fiber filling method for oil and gas fracturing, specifically comprising the following steps:

[0055] S1, installing different models, specifications, and quantities of fiber bundles on the long fiber mounting frame 1, and placing one end of the fiber on the fiber surface treatment machine 3;

[0056] S2, calculating the fiber addition amount according to the long fiber specifications, bundle number, and long fiber speed;

[0057] S3, then start the fiber surface treatment machine 3, fiber cutting machine 4, stirring tank 6, clean water pump 5, conveying pump 7;

[0058] S4, the fiber on the long fiber mounting frame 1 is transported to the fiber cutting machine 4 through the roller 3-3 which is contaminated by the treatment liquid, and the cut fiber enters the stirring tank 6 from the fiber inlet;

[0059] S5, at the same time, the clean water pump 5 sends clean water to the stirring tank 6, and then the fiber and the clean water are mixed through the ultrasonic mixing machine 6-3 and the stirring motor 6-8;

[0060] S6, the mixed solution is transported to the mixing truck mixing tank through the conveying pump 7.

[0061] In the present adding method, the combined fiber: due to the physical properties of the fiber, the cut finished fiber is difficult to be uniformly mixed together.

[0062] The device can install 1-10 kinds of long fiber of polyamide, polyester, polyacrylonitrile, polyester and polylactic acid, various fibers can be mixed and installed at a ratio of 2-50%, and the cut mixed fiber is uniform, and as much as on-site production.

[0063] The fiber online metering method: a precise metering method for calculating the fiber addition amount by the long fiber specification (denier), bundle number and long fiber speed. The long fiber has a clear denier (D) specification (fiber denier: indicates the weight of 9000m length of fiber in grams); the device can install N=10-50 groups of long fibers, suitable for D=600-1200 denier long fiber, long fiber cutting speed V=1-2 m / min; fiber online addition amount G=D / 9000 / 1000*V*N (kg / min).

[0064] Interlocking automatic control method: the automatic adding method collects the real-time sand concentration 60-400 kg / m 3 during the fracturing operation, and automatically calculates the fiber addition amount 0.06-3.2 kg / m 3 according to the set fiber concentration 0.1-0.8% through PLC. When the sand concentration is 60 kg / m 3 , the fiber concentration is set to 0.1%, and the fiber addition amount is 0.06 kg / m 3 ; when the sand concentration is 60 kg / m 3 , the fiber concentration is set to 0.8%, and the fiber addition amount is 0.48 kg / m 3 ; when the sand concentration is 400 kg / m 3 , the fiber concentration is set to 0.1%, and the fiber addition amount is 0.4 kg / m 3 ; when the sand concentration is 400 kg / m 3When the fiber concentration is set to 0.8%, the fiber addition is 3.2 kg / m 3 ; the data acquisition sand concentration is 60-400 kg / m 3 , the designed input fiber concentration is 0.1-0.8 kg / m 3 , the length is 3-18 mm, the fiber addition is calculated by the automatic control system and the long fiber speed, the cutter speed, the mixing uniformity and the conveying to the mixing sand vehicle mixing tank are controlled.

[0065] Table 1 fiber addition calculation table

[0066]

[0067]

[0068] The above description is not any form of limitation to the present application, although the present application has been disclosed by the above examples, however, is not used to limit the present application, any skilled person in the art, without departing from the technical solution range of the present application, can use the above disclosed technical content to make some changes or modifications for equivalent examples of equivalent changes, but any simple modification, equivalent change and modification made to the above examples according to the technical essence of the present application, still belongs to the range of the technical solution of the present application.

Claims

1. A long fiber automatic filling device for oil and gas fracturing, characterized in that, The utility model relates to a long fiber installation frame (1), a fiber surface treatment machine (3), a fiber cutting machine (4), a stirring tank (6), a clean water pump (5) and a conveying pump (7) are arranged in a pry box (12). The outlet of the clean water pump (5) is communicated with the upper end of the stirring tank (6), and the inlet of the conveying pump (7) is communicated with the bottom of the stirring tank (6). The fiber cutting machine (4) is located above the fiber feeding port at the top of the stirring tank (6), and the fiber cut by the fiber cutting machine (4) directly enters the stirring tank (6) from the fiber feeding port. The long fiber installation frame (1) and the fiber surface treatment machine (3) are sequentially arranged on one side of the fiber cutting machine (4), and the fiber on the long fiber installation frame (1) is conveyed to the fiber cutting machine (4) through the fiber surface treatment machine (3) for cutting. The fiber surface treatment machine (3) comprises a treatment frame, a belt, a motor (3-1) and a roller (3-3) arranged on the treatment frame. The stirring tank (6) comprises a tank body, an ultrasonic mixer (6-3), a liquid level meter (6-7) and a stirring motor (6-8) arranged on the tank body. The stirring shaft of the stirring motor (6-8) is sequentially provided with a first layer of paddles (6-5) and a second layer of paddles (6-6). The fiber feeding port is provided with an expanding spraying device (6-2), which comprises an inlet flange (6-2-3) and an outlet flange (6-2-2) connected in sequence. The filling method of the device comprises the following steps: S1, different types, specifications and quantities of fiber clusters are installed on the long fiber installation frame (1), and one end of the fiber is placed on the fiber surface treatment machine (3); S2, the fiber addition amount is calculated according to the fiber specification, bundle number and fiber speed; S3, then the fiber surface treatment machine (3), the fiber cutting machine (4), the stirring tank (6), the clean water pump (5) and the conveying pump (7) are started; S4, the fiber on the long fiber installation frame (1) is conveyed to the fiber cutting machine (4) through the roller (3-3) immersed in the treatment liquid, and the cut fiber enters the stirring tank (6) from the fiber feeding port; 2. The long fiber automatic filling device for oil and gas fracturing according to claim 1, characterized in that, S5, the clean water pump (5) sends clean water to the stirring tank (6), and then the fiber and the clean water are mixed through the fiber ultrasonic mixer (6-3) and the stirring motor (6-8); S6, the mixed solution is conveyed to the mixing tank of the sand mixing vehicle through the conveying pump (7). The pry box (12) is provided with a storage rack (2), and the fiber surface treatment machine (3) and the fiber cutting machine (4) are fixed on the storage rack (2).

3. The long fiber automatic filling device for oil and gas fracturing of claim 1, wherein, The long fiber mounting rack (1) is provided with a long fiber mounting core adding shaft, and a reel type long fiber bundle is horizontally mounted on the long fiber mounting core adding shaft.

4. The long fiber automatic filling device for oil and gas fracturing according to claim 3, characterized in that, The long fiber mounting core adding shaft is provided with a gravity lock pin for preventing the reel type long fiber bundle from falling.

5. The long fiber automatic filler for oil and gas fracturing of claim 1, wherein, The inner wall of the stirring tank (6) is provided with an inclined baffle (6-1).

6. The long fiber automatic filler for oil and gas fracturing of claim 1, wherein, The skid-mounted box body (12) is provided with an automatic control device (8) and a generator set (9), and the top is provided with an ear (10) and a lighting system (11).

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