Coal seam fracturing fluid mixing equipment

Abstract

The utility model provides coal seam fracturing fluid mixing equipment which comprises a skid frame device, the skid frame device is provided with a mixing device, the mixing device comprises a mixing tank provided with a stirring device, and the mixing tank is provided with a liquid inlet, a mixing tank drain outlet and a mixing tank liquid supply port; the discharging device comprises a fracturing fluid inlet manifold, a discharging centrifugal pump and a discharging manifold which are sequentially arranged in the conveying direction of fracturing fluid, the fracturing fluid inlet manifold is communicated with the fluid supply port of the mixing tank, and the discharging manifold is communicated with fracturing pumping equipment; the liquid inlet device is used for conveying fracturing fluid raw materials to the mixing device; and the proppant conveying device is used for conveying the proppant to the mixing device. According to the utility model, guanidine gum liquid and a propping agent can be mixed into fracturing fluid, so that cracks are not closed or not completely closed, gas in a coal seam is collected in advance before the coal seam is mined, the probability of gas accidents is reduced, and the safety of the coal seam is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a coal seam fracturing fluid mixing equipment belongs to the continuity mixing stirring technical field of coal seam fracturing fluid. BACKGROUND

[0002] The gas content in the coal mine is high, and once a gas explosion accident occurs in the coal mining process, great economic losses and personnel casualties will be caused, therefore, for a long time, the gas treatment is regarded as the most important content in the coal mining process in China.

[0003] In the prior art, water can be injected into the coal seam at high pressure through hydraulic fracturing technology, when the pressure gradually increases to exceed the tensile strength of the coal seam, the coal seam will start to break at the weakest place to form one or several cracks, so that the gas in the coal seam can flow from the high pressure area to the low pressure area, and the gas in the coal seam is collected in advance before the coal seam is mined, thereby reducing the probability of gas accidents and improving the safety of the coal seam.

[0004] However, at present, hydraulic fracturing is used, and if the cracks are closed after fracturing, it is not conducive to the discharge of gas. INVENTION CONTENTS

[0005] The technical problem to be solved by the utility model is to provide a coal seam fracturing fluid mixing equipment, which can mix guar gum liquid and proppant into fracturing fluid by setting a liquid inlet device, a proppant conveying device and a mixing device, so that the proppant can play a supporting role in the cracks when the fracturing fluid is injected into the coal seam, thereby ensuring that the cracks are not closed or not completely closed, the gas in the coal seam can flow from the high pressure area to the low pressure area, the gas in the coal seam is collected in advance before the coal seam is mined, the probability of gas accidents is reduced, and the safety of the coal seam is improved.

[0006] The technical problem to be solved by the utility model is solved by the following technical scheme:

[0007] The utility model provides a coal seam fracturing fluid mixing equipment, which comprises a skid device, and the skid device is provided with:

[0008] A mixing device comprises a mixing tank provided with a stirring device, and the mixing tank is provided with a liquid inlet, a mixing tank sewage outlet and a mixing tank liquid supply port;

[0009] An exhaust device comprises a fracturing liquid inlet pipe manifold, an exhaust centrifugal pump and an exhaust pipe manifold arranged in sequence along the conveying direction of the fracturing liquid, the fracturing liquid inlet pipe manifold is communicated with the mixing tank liquid supply port, and the exhaust pipe manifold is communicated with a fracturing pumping equipment;

[0010] a liquid inlet device for feeding a fracturing fluid raw material to the mixing device; and

[0011] a proppant feeding device for feeding proppant to the mixing device.

[0012] In view of the small volume requirement for coal seam fracturing, the mixing tank is a vertical mixing tank; in order to view the mixing condition and monitor the liquid level of the fracturing fluid in real time, the vertical mixing tank is provided with an observation port and a liquid level detection device; in order to prevent foreign matters from falling into the tank and affecting the normal operation of the fracturing pump, the vertical mixing tank is provided with a filter screen at the bottom.

[0013] In order to feed the guan gum liquid to the mixing device, the liquid inlet device is used for feeding the guan gum liquid to the mixing device, which comprises, in sequence along the feeding direction of the guan gum liquid, a fracturing fluid raw material liquid inlet manifold, a liquid inlet centrifugal pump and a liquid supply manifold; the liquid supply manifold is in communication with the liquid inlet port of the mixing device.

[0014] Preferably, the liquid inlet device further comprises a flow meter arranged to monitor the liquid supply flow and an electric proportional valve arranged to control the flow of the guan gum liquid into the mixing device.

[0015] In order to effectively control the feeding amount of the proppant, the proppant feeding device comprises a spiral auger.

[0016] In order to control the inflow and outflow of the fracturing fluid, the outflow device further comprises an inlet valve and an outlet valve.

[0017] In order to facilitate the operator to control the coal seam fracturing fluid mixing equipment and to maintain and repair the same, the coal seam fracturing fluid mixing equipment further comprises an operating platform device arranged on the skid device, and the operating platform device comprises a ladder, an operating platform and an electric control box.

[0018] In order to facilitate the operator to carry out local operation debugging, the electric proportional valve is arranged on the operating platform device.

[0019] In order to facilitate the hoisting and transportation of the coal seam fracturing fluid mixing equipment, the skid device comprises a skid and a protection frame mounted on the skid.

[0020] In summary, by arranging the liquid inlet device, the proppant feeding device and the mixing device, the guan gum liquid and the proppant can be mixed into the fracturing fluid, and after the fracturing fluid is injected into the coal seam, the proppant can play a supporting role in the fracture, thereby ensuring that the fracture is not closed or not completely closed, allowing the gas in the coal seam to flow from the high pressure area to the low pressure area, collecting the gas in the coal seam in advance before the coal seam is mined, reducing the probability of gas accidents and improving the safety of the coal seam.

[0021] The technical solutions of the present application will be described in detail below in combination with the drawings and specific embodiments. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the coal seam fracturing fluid mixing equipment of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the skid frame device of this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the stirring device of this utility model;

[0025] Figure 4 This is a cross-sectional schematic diagram of the stirring device of this utility model;

[0026] Figure 5 This is a schematic diagram of the liquid inlet device of this utility model;

[0027] Figure 6 This is a schematic diagram of the discharge device of this utility model;

[0028] Figure 7 This is a schematic diagram of the structure of the operating platform device of this utility model. Detailed Implementation

[0029] The technical solutions of various embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0030] It should be noted that the use of terms such as "approximately" and "about" in the following detailed description and claims is to take into account factors such as manufacturing tolerances and machining accuracy that are understood by those skilled in the art, and will not lead to ambiguity in the description or unclear scope of protection. Furthermore, the orientations such as "upper," "lower," "left," "right," "front," and "rear" appearing herein are merely directions defined in conjunction with the accompanying drawings for ease of explanation. Those skilled in the art, after reading this document, will be able to easily discern the orientation corresponding to the orientation described herein when the device is rotated or moved and exhibits an orientation inconsistent with that described herein.

[0031] Note that the same structures, elements, or parts in the accompanying drawings are indicated by the same reference numerals.

[0032] Figure 1 This is a schematic diagram of the coal seam fracturing fluid mixing equipment of this utility model; Figure 2 This is a schematic diagram of the structure of the skid frame device of this utility model; Figure 3It is a structure schematic view of the stirring device of the utility model. Figure 4 It is a sectional view schematic view of the stirring device of the utility model. Figure 5 It is a structure schematic view of the liquid inlet device of the utility model. Figure 6 It is a structure schematic view of the discharge device of the utility model. Figure 7 It is a structure schematic view of the operation platform device of the utility model. Figures 1 to 7 As shown in the figure, the utility model provides a coal seam fracturing fluid mixing equipment, including skid device 40, skid device 40 is provided with mixing device 10, discharge device 20, liquid inlet device 30 and proppant conveying device 54. Skid device 40 includes but is not limited to skid 41 and protection frame 42 installed on skid 41, during the whole machine assembly and transportation, the hoisting and transfer of coal seam fracturing fluid mixing equipment can be carried out through protection frame 42.

[0033] Mixing device 10 includes the mixing tank that is provided with stirring device 12. Preferably, vertical stirring form is adopted, and the mixing tank is preferably vertical mixing tank 11, which is taken as an example for description hereinafter. Vertical mixing tank 11 is used for bearing mixed fracturing fluid, and the mixing condition in vertical mixing tank 11 can be observed through the observation port on vertical mixing tank 11. Stirring device 12 includes stirring blade and its driving device (such as driving motor, etc.), which is used for stirring the fracturing fluid in vertical mixing tank 11, more specifically, the mixing of slurry is realized by driving the stirring blade to rotate through the driving device. Unlike the traditional oilfield fracturing sand mixing tank, vertical mixing tank 11 is preferably vertical single-layer tank, which has simple structure and low cost, and is suitable for the small displacement demand of coal seam fracturing. In order to prevent foreign matters from falling into the tank and affecting the normal operation of fracturing pump, filter screen 16 is arranged at the bottom of vertical mixing tank 11.

[0034] Liquid level detection device 13 is further arranged in vertical mixing tank 11, which monitors the liquid level of fracturing fluid in vertical mixing tank 11 in real time, so as to ensure that the liquid level is kept within the set range.

[0035] Liquid inlet, mixing tank blowdown 14 and mixing tank liquid supply port 15 are further arranged on vertical mixing tank 11. The liquid inlet is preferably arranged directly above the tank body. The mixed fracturing fluid can be supplied to discharge device 20 through mixing tank liquid supply port 15. When it is necessary to empty vertical mixing tank 11 or the fracturing fluid in the mixing tank needs to be emptied due to abnormal conditions, mixing tank blowdown 14 is opened, and the mixing tank vertical mixing tank 11 can be emptied through the self-flow of fracturing fluid.

[0036] Proppant conveying device 54 includes spiral auger, which is used for conveying proppant for mixing device 10, and preferably adopts spiral conveying mode to horizontally convey proppant, and the feeding amount of proppant can be effectively controlled by controlling the rotation speed of spiral auger. Exemplarily, the proppant can be coconut shell particles, walnut shell particles or compressed carbon powder, etc.

[0037] The liquid inlet device 30 is used to deliver fracturing fluid raw materials for the mixing device 10, which includes but is not limited to guar gum liquid, water, etc. Specifically, the liquid inlet device 30 includes a fracturing fluid raw material inlet manifold 32, a liquid inlet centrifugal pump 31 and a liquid supply manifold 35 arranged in sequence along the delivery direction of the fracturing fluid raw materials. The present application does not limit the type of fracturing fluid raw materials, and those skilled in the art can use the fracturing fluid raw materials (guar gum liquid, water, etc.) in the prior art to prepare fracturing fluid according to different conditions. In this paper, the guar gum liquid is taken as an example to illustrate the fracturing fluid raw materials.

[0038] In order to monitor the liquid supply flow, the liquid inlet device 30 further includes a flow meter 33. In order to control the flow of guar gum liquid into the mixing device 10, the liquid inlet device 30 further includes an electric proportional valve 34.

[0039] The guar gum liquid is supplied to the liquid inlet centrifugal pump 31 through the fracturing fluid raw material inlet manifold 32, the flow meter 33 is used to monitor the liquid supply flow, and the flow of the guar gum liquid into the mixing device 10 is adjusted by controlling the electric proportional valve 34. The liquid supply manifold 35 communicates with the liquid inlet of the mixing device 10 to supply the guar gum liquid into the mixing device 10.

[0040] The mixing device 10 can mix the guar gum liquid and the proppant into the fracturing fluid, which is injected into the coal seam at high pressure, and the proppant carried in plays a supporting role in the fracture, which can ensure that the fracture does not close or does not close completely, that is, a fracture with sufficient length, width and height is formed in the coal seam, so that the gas in the coal seam can flow from the high pressure area to the low pressure area, and the gas in the coal seam can be collected in advance before the coal seam is mined, thereby reducing the probability of gas accidents and improving the safety of the coal seam.

[0041] The discharge device 20 includes a fracturing fluid inlet manifold 23, a discharge centrifugal pump 21 and a discharge manifold 24 arranged in sequence along the delivery direction of the fracturing fluid, the fracturing fluid inlet manifold 23 communicates with the mixing tank liquid supply port 15 of the mixing device 10, and the discharge manifold 24 communicates with the fracturing pumping equipment, so as to supply the mixed fracturing fluid to the fracturing pumping equipment.

[0042] Further, the discharging device 20 can further comprise a liquid inlet valve 22 and discharging valves. The liquid inlet valve 22 is used to control the flow of the fracturing fluid in the mixing device 10 into the discharging centrifugal pump 21, and the discharged fracturing fluid is supplied to the fracturing pumping equipment through the discharging manifold 24. The number of the discharging valves is not limited in the present application, and can be designed and selected according to the actual situation by those skilled in the art. Exemplarily, in the present embodiment, the discharging valves comprise a first discharging valve 25 and a second discharging valve 26. According to the actual site situation, the first discharging valve 25 and the second discharging valve 26 can be selectively connected to different fracturing pumping equipment. By setting different numbers of discharging valves, the coal seam fracturing fluid mixing equipment can supply fracturing fluid to fracturing pumping equipment of different numbers. Obviously, a plurality of coal seam fracturing fluid mixing equipment can also be used to supply fracturing fluid to one fracturing pumping equipment, so as to realize large capacity fracturing.

[0043] In order to facilitate the operator to control the coal seam fracturing fluid mixing equipment and to maintain it, etc., the coal seam fracturing fluid mixing equipment further comprises an operation platform device 50 arranged on the skid device 40. The operation platform device 50 comprises a ladder 51, an operation platform 52 and an electric control box 53. The operator can go to the operation platform 52 through the ladder 51, and the electrical components of the whole equipment are integrated into the electric control box 53.

[0044] In order to facilitate the operator to carry out local operation debugging, the electric proportional valve 34 is arranged on the operation platform device 50. The operator can control the feeding of the proppant, etc. by controlling the electric proportional valve 34 on the operation platform 52.

[0045] The working process of the coal seam fracturing fluid mixing equipment in the present application is as follows:

[0046] The proppant conveying device 54 and the liquid inlet device 30 are used to continuously feed the material into the mixing device 10, and the mixing device 10 is continuously stirred. The discharging device 20 is connected to the mixing device 10 and the fracturing pumping equipment respectively, and the stirred fracturing fluid is continuously supplied to the fracturing pumping equipment while the mixing device 10 is stirring.

[0047] During the process, the liquid level change in the vertical mixing tank 11 can be monitored through the observation port on the vertical mixing tank 11, when the liquid level is lower than the set liquid level height range, the opening of the electric proportional valve 34 can be adjusted to increase the auger rotating speed of the proppant conveying device 54, and the amount of guar gum liquid and proppant is proportionally increased. When the liquid level rises to the set liquid level range, the opening of the electric proportional valve 34 is appropriately adjusted to decrease the auger rotating speed of the proppant conveying device 54. When the liquid level in the tank is higher than the set liquid level height range, the opening of the electric proportional valve 34 can be adjusted to decrease the auger rotating speed of the proppant conveying device 54, and the amount of guar gum liquid and proppant is proportionally decreased. When the liquid level decreases to the set liquid level range, the opening of the electric proportional valve 34 is appropriately adjusted to increase the auger rotating speed of the proppant conveying device 54. Through the above-mentioned mode, the working condition of stable liquid feeding, stable liquid level in the tank and stable discharge capacity is finally formed.

[0048] Alternatively, when the liquid level in the vertical mixing tank 11 is lower than the set liquid level height range, the rotating speed of the fracturing pumping equipment and the rotating speed of the discharge centrifugal pump 21 can be adjusted to decrease. When the liquid level rises to the set liquid level range, the rotating speed of the fracturing pumping equipment and the rotating speed of the discharge centrifugal pump 21 are appropriately adjusted to increase. When the liquid level in the tank is higher than the set liquid level height range, the rotating speed of the fracturing pumping equipment and the rotating speed of the discharge centrifugal pump 21 are adjusted to increase. When the liquid level in the tank decreases to the set liquid level range, the rotating speed of the fracturing pumping equipment and the rotating speed of the discharge centrifugal pump 21 are appropriately adjusted to decrease. Through the above-mentioned mode, the working condition of stable discharge flow, stable liquid level in the tank and stable liquid feeding is finally formed.

[0049] Obviously, the operator can also use the above-mentioned two modes for adjustment at the same time.

[0050] In summary, the guan gum liquid and the proppant can be mixed into the fracturing fluid through the setting of the liquid feeding device, the proppant conveying device and the mixing device, when the fracturing fluid is injected into the coal seam, the proppant can play a supporting role in the fracture, so that the fracture is not closed or not completely closed, and the gas in the coal seam can flow from the high pressure area to the low pressure area, the gas in the coal seam is collected in advance before the coal seam is mined, the probability of gas accident is reduced, and the safety of the coal seam is improved.

[0051] LIST OF REFERENCE NUMERALS

[0052] 10 mixing device

[0053] 11 vertical mixing tank

[0054] 12 stirring device

[0055] 13 liquid level detection device

[0056] 14 tank drain

[0057] 15 tank liquid inlet

[0058] 16 screen

[0059] 20 discharge device

[0060] 21 discharge centrifugal pump

[0061] 22 inlet valve

[0062] 23 fracturing fluid inlet manifold

[0063] 24 discharge manifold

[0064] 25 first discharge valve

[0065] 26 second discharge valve

[0066] 30 inlet device

[0067] 31 inlet centrifugal pump

[0068] 32 fracturing fluid raw material inlet manifold

[0069] 33 flow meter

[0070] 34 electric proportional valve

[0071] 35 liquid supply manifold

[0072] 40 skid mounting device

[0073] 41 skid

[0074] 42 protection frame

[0075] 50 operation platform device

[0076] 51 cat ladder

[0077] 52 operation platform

[0078] 53 electric control box

[0079] 54 proppant delivery device

Claims

1. A coal seam fracturing fluid mixing device, characterized in that, The coal seam fracturing fluid mixing equipment includes a skid assembly (40), on which are provided: The mixing device (10) includes a mixing tank equipped with a stirring device (12), and the mixing tank is provided with a liquid inlet, a mixing tank drain outlet (14) and a mixing tank supply outlet (15); The discharge device (20) includes a fracturing fluid inlet manifold (23), a discharge centrifugal pump (21) and a discharge manifold (24) arranged sequentially along the fracturing fluid delivery direction. The fracturing fluid inlet manifold (23) is connected to the mixing tank supply port (15), and the discharge manifold (24) is connected to the fracturing pumping equipment. A feed device (30) for supplying fracturing fluid feedstock to the mixing unit (10); and A proppant delivery device (54) for delivering proppant to the mixing device (10); The mixing tank is a vertical mixing tank (11), which is equipped with an observation port and a liquid level detection device (13). A filter screen (16) is provided at the bottom of the vertical mixing tank (11).

2. The coal seam fracturing fluid mixing equipment as described in claim 1, characterized in that, The inlet device (30) includes a fracturing fluid feedstock inlet manifold (32), an inlet centrifugal pump (31), and a supply manifold (35) arranged sequentially along the conveying direction of the fracturing fluid feedstock; the supply manifold (35) is connected to the inlet of the mixing device (10).

3. The coal seam fracturing fluid mixing equipment as described in claim 2, characterized in that, The fluid inlet device (30) also includes a flow meter (33) configured to monitor the fluid supply flow rate and an electric proportional valve (34) configured to control the flow rate of fracturing fluid feedstock into the mixing device (10).

4. The coal seam fracturing fluid mixing equipment as described in claim 1, characterized in that, The proppant delivery device (54) includes a screw conveyor.

5. The coal seam fracturing fluid mixing equipment as described in claim 1, characterized in that, The discharge device (20) also includes an inlet valve (22) and a discharge valve.

6. The coal seam fracturing fluid mixing equipment as described in claim 3, characterized in that, The coal seam fracturing fluid mixing equipment also includes an operating platform device (50) installed on the skid device (40), the operating platform device (50) including a ladder (51), an operating platform (52) and an electrical control box (53).

7. The coal seam fracturing fluid mixing equipment as described in claim 6, characterized in that, The electric proportional valve (34) is arranged on the operating platform device (50).

8. The coal seam fracturing fluid mixing equipment as described in claim 1, characterized in that, The skid assembly (40) includes a skid (41) and a protective frame (42) mounted on the skid (41).

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