Cementing pump skid fully enclosed slurry mixing tank capable of achieving fully automatic slurry mixing and slurry mixing method

Abstract

The present invention relates to a fully enclosed cementing pump skid slurry mixing tank and a slurry mixing method that can achieve fully automatic slurry mixing. The fully enclosed cementing pump skid slurry mixing tank and a slurry mixing method that can achieve fully automatic slurry mixing include: a closed tank body, a gas diffusion groove is provided on the top of the tank body, a slurry mixing inlet is formed on the gas diffusion groove, and a discharge outlet and a sewage outlet are provided on the bottom of the closed tank body; a slurry mixing device, which is connected to the slurry mixing inlet and is used for prefabrication of slurry; a dust removal device, which is connected to the gas diffusion groove and is used for collecting dust in the closed tank body; a stirring device, which is arranged inside the closed tank body and is used for stirring the slurry in the closed tank body; a flushing device, which is arranged inside the closed tank body and is connected to an external water source. The fully enclosed cementing pump skid slurry mixing tank and a slurry mixing method that can achieve fully automatic slurry mixing of the present invention can effectively reduce problems such as cement slurry splashing and cement ash dust pollution, and improve the mixing effect in the tank.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield cementing supporting equipment, and particularly relates to a cementing pump skid fully enclosed slurry mixing tank capable of realizing fully automatic slurry mixing, and a slurry mixing method. Background Art

[0002] In the field of oilfield supporting equipment, cementing operations are currently developing in the direction of increasing automation and intelligence, so that cementing operations, while ensuring operation quality and improving operation efficiency, also place more emphasis on environmental protection and safety, clean cementing, and fully automatic unmanned operations.

[0003] In existing technology, the mixing tank and its mixing system for preparing cement slurry, a critical component in cementing operations, often suffer from issues such as manual mixing, slurry splashing, cement dust pollution, heavy manual cleaning workload, and uneven mixing within the tank. Furthermore, the mixing method in the original mixing tank was randomly adjusted based on the operator's observation of the slurry, with a rotation speed of approximately 0-350 rpm and a mixing time of approximately 300 seconds. The paddle agitator in the original mixing tank was located approximately 450 mm from the tank bottom, which easily resulted in dead spots and siltation in the cement slurry mixing process. Summary of the Invention

[0004] In order to solve all or part of the above problems, the present invention aims to provide a fully enclosed cementing pump skid mixing tank that can achieve fully automatic slurry mixing, so as to effectively reduce problems such as cement slurry splashing and cement ash dust pollution, and improve the mixing effect in the tank.

[0005] According to the first aspect of the present application, a fully enclosed slurry mixing tank for a cementing pump skid that can achieve fully automatic slurry mixing is provided, comprising: a closed tank body, a gas diffusion groove is provided on the top of which a slurry mixing inlet is formed, and a discharge outlet and a sewage outlet are provided at the bottom of the closed tank body; a slurry mixing device, which is connected to the slurry mixing inlet and is used for prefabrication of slurry; a dust removal device, which is connected to the gas diffusion groove and is used for collecting dust in the closed tank body; a stirring device, which is arranged inside the closed tank body and is used for stirring the slurry in the closed tank body; a flushing device, which is arranged inside the closed tank body and is connected to an external water source.

[0006] In some embodiments, the stirring device includes: a drive device fixed to the top of the closed tank; a rotating shaft connected to the drive device and disposed vertically within the closed tank; and a stirring blade disposed on the rotating shaft and located in the middle of the closed tank. The rotating shaft is disposed at an angle of 10° to 20° with respect to the vertical direction, and the stirring blade is disposed at a vertical distance of 200 mm to 400 mm from the bottom of the closed tank.

[0007] In some embodiments, the flushing device includes a tube body that is arranged around the inner wall of the closed tank body, the liquid inlet end of the tube body is used to be connected to an external injection pump, and a plurality of injection holes are formed on the part of the tube body located inside the closed tank body, and the plurality of injection holes are arranged toward the tank wall and interior of the closed tank body.

[0008] In some embodiments, at least two discharge ports are provided at the bottom of the closed tank body, wherein one of the two discharge ports is used to connect to a circulating centrifugal pump to achieve remixing of the slurry within the closed tank body; and the other of the two discharge ports is used to output the slurry to the outside through a booster centrifugal pump.

[0009] In some embodiments, the bottom surface of the closed tank body is constructed as an inclined surface and a plane connected to the inclined surface. The discharge outlet and the sewage outlet are both arranged on the side wall of the bottom of the closed tank body and are located in a flat position. The discharge outlet and the sewage outlet are both provided with a filtering device.

[0010] In some embodiments, a weir plate is provided in the closed tank body in the vertical direction, and a weir space is formed between the top of the weir plate and the top of the closed tank body. A valve body is provided on the weir plate, and the weir plate divides the interior of the closed tank body into a mixing chamber and a balancing chamber, wherein the mixing inlet is provided above the mixing chamber, and stirring devices are provided in the mixing chamber and the balancing chamber. At the same time, a discharge outlet and a sewage outlet are provided in the mixing chamber and the balancing chamber.

[0011] In some embodiments, at least two breathing caps are further provided on the top of the closed tank body, and the two breathing caps are respectively provided above the slurry mixing chamber and the equalization chamber.

[0012] In some embodiments, two liquid level detection devices are further provided inside the closed tank body, and the two liquid level detection devices are respectively provided in the slurry mixing chamber and the balancing chamber.

[0013] In some embodiments, a maintenance hole is further provided on the top of the closed tank body, and the maintenance hole is used for maintenance of the interior of the closed tank body.

[0014] As can be seen from the above technical solution, the fully enclosed cementing pump skid provided by the present invention, which can realize fully automatic slurry mixing, has the following advantages:

[0015] 1) The fully enclosed cementing pump skid of the present invention can achieve fully automatic slurry mixing. The closed tank body of the slurry mixing tank is a fully enclosed structure. During the mixing of the slurry, the fully enclosed structure can effectively reduce the splashing of cement slurry;

[0016] 2) The fully enclosed mixing tank of the cementing pump skid of the present invention, which can achieve fully automatic slurry mixing, is provided with a dust removal device, which can promptly collect and process dry cement dust, thereby effectively preventing the dry cement dust from escaping from the fully enclosed mixing tank of the cementing pump skid of the present invention during operation from entering the external environment and causing pollution;

[0017] 3) After the cementing pump skid of the present invention is fully enclosed and can achieve fully automatic slurry mixing, the residual cement slurry can be cleaned by the provided flushing device. This can further improve the convenience of cleaning the closed tank body after the operation and effectively keep the interior of the closed tank body clean.

[0018] 4) The fully enclosed mixing tank of the cementing pump skid of the present invention, which can realize fully automatic slurry mixing, can reduce the intervention of production personnel, and the entire slurry mixing process can be realized in a fully automatic and unmanned manner;

[0019] 5) During operation, the fully enclosed mixing tank of the cementing pump skid of the present invention, which enables fully automatic mixing, has its stirring blades set at a speed of 500 rpm, which is more suitable for stirring the slurry and enables rapid and uniform mixing of the slurry. Furthermore, in this application, the angle between the rotating shaft and the vertical direction is 15°, and the vertical distance between the stirring blades and the bottom of the enclosed tank body is 350 mm. This angle and distance further ensure a more uniform mixing effect.

[0020] According to the second aspect of the present application, a slurry mixing method is provided, which is applied to the above-mentioned cementing pump skid fully enclosed slurry mixing tank that can realize fully automatic slurry mixing, including: providing a closed tank body, a gas diffusion groove is provided on the top of the tank body, a slurry mixing inlet is formed on the gas diffusion groove, and a discharge outlet and a sewage outlet are provided at the bottom of the closed tank body; providing a slurry mixing device, which is connected to the slurry mixing inlet, and the slurry mixing device is used for prefabrication of slurry; providing a dust removal device, which is connected to the gas diffusion groove, and the dust removal device is used for collecting dust in the closed tank body; providing a stirring device, which is arranged inside the closed tank body, and the stirring device is used to stir the slurry in the closed tank body; providing a flushing device, which is arranged inside the closed tank body and connected to an external water source. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the external structure of a fully enclosed slurry mixing tank of a cementing pump skid capable of fully automatic slurry mixing according to an embodiment of the present invention;

[0022] Figure 2 for Figure 1 The schematic diagram of the main structure of the internal structure of the fully enclosed cementing pump skid slurry mixing tank capable of fully automatic slurry mixing is shown;

[0023] Figure 3 for Figure 2The schematic diagram of the top view of the internal structure of the fully enclosed slurry mixing tank of the cementing pump skid capable of achieving fully automatic slurry mixing is shown;

[0024] Figure 4 Schematic diagram of the process of the slurry mixing method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to better understand the purpose, structure and function of the present invention, the fully enclosed slurry mixing tank of the cementing pump skid capable of fully automatic slurry mixing of the present invention is further described in detail below with reference to the accompanying drawings.

[0026] Figure 1 Schematic diagram of the external structure of a fully enclosed slurry mixing tank 100 of a cementing pump skid capable of fully automatic slurry mixing according to an embodiment of the present invention; Figure 2 for Figure 1 The front view of the internal structure of the fully enclosed cementing pump skid 100 capable of fully automatic slurry mixing is shown; Figure 3 for Figure 2 The top view of the internal structure of the fully enclosed cementing pump skid 100 capable of fully automatic slurry mixing is shown. Figures 1 to 3 As shown, the cementing pump skid is a fully enclosed slurry mixing tank 100 that can realize fully automatic slurry mixing, comprising: a closed tank body 1, a gas diffusion groove 11 is provided on the top, a slurry inlet 12 is formed on the gas diffusion groove 11, and a discharge outlet 13 and a sewage outlet 14 are provided at the bottom of the closed tank body 1; a slurry mixing device 2, which is connected to the slurry inlet 12, and the slurry mixing device 2 is used for prefabrication of slurry; a dust removal device 3, which is connected to the gas diffusion groove 11, and the dust removal device 3 is used for collecting dust in the closed tank body 1; a stirring device 4, which is arranged inside the closed tank body 1, and the stirring device 4 is used to stir the slurry in the closed tank body 1; a flushing device 5, which is arranged inside the closed tank body 1 and is connected to an external water source.

[0027] According to the embodiment of the present invention, the fully enclosed slurry mixing tank 100 of the cementing pump skid that can achieve fully automatic slurry mixing is used in practice. The slurry is pre-made by the slurry mixing device 2, that is, the slurry mixing device 2 mixes dry cement ash and water in a certain ratio in advance to prepare cement slurry. The cement slurry is the pre-made slurry. After the slurry enters the interior of the closed tank body 1 through the slurry mixing inlet 12, the stirring device 4 is turned on. The stirring device 4 stirs the slurry inside the closed tank body, thereby achieving uniform mixing of the dry cement ash and water in the pre-made slurry. The uniformly mixed slurry is discharged to the external plunger pump through the discharge port 13. The dust removal system in this application is connected to the gas diffusion tank 11 on the top of the closed tank body 1, which can effectively collect and remove dust from the dry cement ash. After the operation is completed, the flushing device 5 in this application can be turned on to clean the cement slurry remaining in the closed tank body 1. The cement slurry after flushing is discharged to the outside through the sewage outlet 14.

[0028] Through the above configuration, compared with the prior art, the fully enclosed cementing pump skid slurry mixing tank 100 of the embodiment of the present invention that can achieve fully automatic slurry mixing has the following advantages:

[0029] 1) The fully enclosed tank body 1 of the cementing pump skid 100 of the embodiment of the present invention, which can realize fully automatic slurry mixing, is a fully enclosed structure. During the mixing of the slurry, the fully enclosed structure can effectively reduce the splashing of the cement slurry;

[0030] 2) The fully enclosed mixing tank 100 of the cementing pump skid capable of fully automatic slurry mixing according to the embodiment of the present invention is provided with a dust removal device 3, which can promptly collect and process dry cement dust, thereby effectively preventing dry cement dust from escaping from the fully enclosed mixing tank 100 of the cementing pump skid capable of fully automatic slurry mixing according to the embodiment of the present invention during operation from entering the external environment and causing pollution;

[0031] 3) After the operation is completed, the fully enclosed cementing pump skid 100 of the embodiment of the present invention can be flushed with the flushing device 5 to clean the residual cement slurry, thereby further improving the convenience of cleaning the closed tank body 1 after the operation and effectively keeping the interior of the closed tank body 1 clean.

[0032] 4) The fully enclosed slurry mixing tank 100 of the cementing pump skid of the embodiment of the present invention, which can realize fully automatic slurry mixing, can reduce the intervention of production personnel, and can realize fully automatic unmanned operation during the entire slurry mixing process.

[0033] It should be further explained that the exhaust port of the gas diffusion tank 11 in the present application can be sealed and connected to the dust removal device 3 through a clamp. The exhaust port of the slurry mixing device 2 in the present application is connected to the dust removal device 3. The slurry mixing device 2 in the present application can not only realize the pre-mixing of external dry cement ash and clean water, but also timely adjust the ratio of dry cement ash and clean water according to the real-time cement slurry density to prepare cement slurry that meets the requirements. In the present application, the bottom of the closed tank body 1 can be connected to an ear plate 15, and the ear plate 15 can be connected to the closed tank body 1 through a rib plate. By providing the ear plate 15, the convenience of use of the fully enclosed cementing pump skid of the embodiment of the present invention can be further improved. For example, the ear plate 15 can be used to hoist the slurry mixing tank 100 in accordance with specific usage requirements. The dust removal device 3 in the present application adopts a structure that integrates a filter (not shown in the figure) and a centrifuge (not shown in the figure) to realize the separation, filtration and collection of dry cement ash discharged from the closed tank body 1 during the slurry mixing operation, thereby avoiding dry ash from polluting the environment.

[0034] Please refer to Figure 2In some embodiments, the stirring device 4 may include: a driving device 41 fixed to the top of the closed tank body 1; a rotating shaft 42 connected to the driving device 41 and vertically disposed within the closed tank body 1; and a stirring blade 43 disposed on the rotating shaft 42 and located in the middle of the closed tank body 1. The rotating shaft 42 is configured to have an angle with the vertical direction ranging from 10° to 20°, and the stirring blade 43 is configured to have a vertical distance from the bottom of the closed tank body 1 ranging from 200 mm to 400 mm.

[0035] The driving device 41 mentioned in this embodiment can be a stirrer motor. The stirring blade 43 mentioned in this embodiment can be configured as a blade stirrer. The angle between the rotating shaft 42 mentioned in this embodiment and the vertical direction can be preferably 15°. The vertical distance between the stirring blade 43 mentioned in this embodiment and the bottom of the closed tank body 1 can be preferably 350mm. The plane 17 on which the stirring blade 43 mentioned in this embodiment is located should be understood as being perpendicular to the axis of the rotating shaft 42.

[0036] Through the above-mentioned setting, in this application, in combination with the multiple practices of the production personnel, it is obtained that when the stirring device 4 stirs the slurry through the stirring blade 43, the setting speed of the stirring blade 43 can be set to 500rpm by the driving device 41. The stirring time to reach stability at this speed is greatly shortened. Continuing to increase the speed can only slightly shorten the stable stirring time, but the stirring power will increase accordingly. Therefore, the setting speed of the stirring blade 43 is set to 500rpm, which can be more suitable for the stirring of the slurry and enable the slurry to be quickly and evenly mixed. In this application, the rotating shaft 42 is set at an angle of 15° with the vertical direction, and the vertical distance between the stirring blade 43 and the bottom of the closed tank body 1 is 350mm. It is found in the process of multiple practices that the setting of this angle and distance can further make the slurry stirring effect more uniform. In addition, the rotating shaft 42 is set at an angle of 15° with the vertical direction, so that the rectangular area formed by the plane 17 where the stirring blade 43 is located during the stirring process becomes tilted, which further increases the stirring range of the stirring blade 43 to make the slurry stirring effect more uniform.

[0037] Please refer to Figure 2 In some embodiments, the flushing device 5 may include a tube body 51 arranged around the inner wall of the closed tank body 1, the liquid inlet end of the tube body 51 is used to be connected to an external injection pump, and a plurality of injection holes (not shown in the figure) are formed on the portion of the tube body 51 located inside the closed tank body 1, and the plurality of injection holes are arranged toward the tank wall and interior of the closed tank body 1.

[0038] In this embodiment, the tube body 51 disposed around the inner wall of the closed tank body 1 may include multiple layers of tube bodies 51. In this embodiment, an external jet pump is used to input high-pressure liquid into the tube body 51. The high-pressure liquid can be sprayed in an annular mist through the spray hole to flush the tank wall and interior of the closed tank body 1. The spray hole in this embodiment can be designed according to specific needs.

[0039] Please refer to Figure 1 and Figure 3 In some embodiments, the bottom of the closed tank body 1 may be provided with at least two discharge ports 13. One of the two discharge ports 13 is used to connect to a circulating centrifugal pump to achieve remixing of the slurry within the closed tank body 1; the other of the two discharge ports 13 is used to output the slurry to the outside via a booster centrifugal pump.

[0040] In this embodiment, one of the two discharge ports 13 can be used to circulate the mixed slurry back into the closed tank 1 through a circulating centrifugal pump for further mixing. The other of the two discharge ports 13 can be used to pump the mixed cement slurry to the plunger pump suction port of the cementing equipment through a booster centrifugal pump, and then pump the cement slurry out at high pressure.

[0041] Please refer to Figure 2 In some embodiments, the bottom surface of the closed tank body 1 can be constructed as an inclined surface 16 and a plane 17 connected to the inclined surface 16. The discharge outlet 13 and the sewage outlet 14 can both be arranged on the side wall of the bottom of the closed tank body 1 and located at the position of the plane 17. The discharge outlet 13 and the sewage outlet 14 are both provided with a filtering device.

[0042] In this embodiment, it is understood that the discharge port 13 and the sewage outlet 14 are both located at the lowest point of the bottom of the closed tank body 1. In this embodiment, the filter device can be a filter screen. In this application, the inclined surface 16 formed on the bottom surface of the closed tank body 1 enables the bottom structure of the closed tank body 1 to be tilted, which can better facilitate the discharge of the slurry within the closed tank body 1. In addition, the provided filter device can also effectively prevent larger particles from entering the pipeline of the cementing equipment.

[0043] Please continue to refer to Figure 2 and Figure 3 In some embodiments, a weir plate 18 is vertically disposed within the closed tank body 1. A weir space 181 is formed between the top of the weir plate 18 and the top of the closed tank body 1. A valve body 19 is disposed on the weir plate 18. The weir plate 18 divides the interior of the closed tank body 1 into a mixing chamber 182 and a balancing chamber 183. A mixing inlet 12 is disposed above the mixing chamber 182. A stirring device 4 is disposed within both the mixing chamber 182 and the balancing chamber 183. Furthermore, a discharge port 13 and a sewage outlet 14 are disposed within both the mixing chamber 182 and the balancing chamber 183.

[0044] In this embodiment, the valve body 19 can be a butterfly valve. In this embodiment, the weir plate 18 divides the interior of the closed tank body 1 into a mixing chamber 182 and a balancing chamber 183. At the same time, the slurry inlet 12 is arranged above the mixing chamber 182. In this way, the prefabricated slurry first enters the mixing chamber 182. Agitators are provided in both the mixing chamber 182 and the balancing chamber 183. When mixing the slurry, the slurry is first circulated and mixed in the mixing chamber 182, and the mixed slurry flows over the weir plate 18 into the balancing chamber 183, and then is pumped after stirring. Through this setting, the chances of the slurry being mixed back and forth are increased, and the slurry releases the gas therein in the process of flowing over the weir plate 18 and being stirred, and is further mixed. This can effectively eliminate the residual gas in the slurry and make the density of the slurry uniform. In addition, both the mixing chamber 182 and the equalizing chamber 183 are provided with a discharge port 13 and a sewage discharge port 14. As can be seen from the above, the discharge port 13 can be used to achieve secondary mixing of the cement slurry through an external circulating centrifugal pump or to pump the slurry to the plunger pump through a booster centrifugal pump. The sewage discharge port 14 allows sewage to be discharged from both the mixing chamber 182 and the equalizing chamber 183 after flushing by the flushing device 5.

[0045] Please refer to Figure 1 In some embodiments, at least two breathing caps 19 may be installed on the top of the closed tank body 1. The two breathing caps 19 are respectively installed above the mixing chamber 182 and the equalization chamber 183. The breathing caps 19 in this embodiment can also be breathable caps, and their connection method can be a quick-release clamp connection or a threaded connection. The breathing caps 19 in this embodiment are installed vertically on the top of the closed tank body 1. With this arrangement, the breathing caps 19 can be used to exhaust gas from the fully enclosed closed tank body 1.

[0046] In some embodiments, two liquid level detection devices (not shown in the figure) may be further provided inside the closed tank body 1 , and the two liquid level detection devices are respectively provided in the mixing chamber 182 and the balancing chamber 183 .

[0047] In this embodiment, the liquid level detection device can be a liquid level monitoring system using radar waves. Through this configuration, the liquid level detection device can be used to detect the liquid level in the closed tank body 1 in real time, providing data reference for the automatic mixing of the fully enclosed cementing pump skid 100 capable of fully automatic mixing.

[0048] Please refer to Figure 1 In some embodiments, a maintenance hole 6 is further provided on the top of the closed tank body 1 , and the maintenance hole 6 is used for maintenance of the interior of the closed tank body 1 .

[0049] In this embodiment, the inspection hole 6 is in a sealed closed state when not in use. In this embodiment, the inspection hole 6 can also be provided with an observation window.

[0050] Please continue to refer to Figure 1 In some embodiments, the cementing pump skid fully enclosed slurry mixing tank 100 that can realize fully automatic slurry mixing may also include a baffle 7, which is arranged around the top of the closed tank body 1 along the edge of the top of the closed tank body 1 to further enclose the cementing pump skid fully enclosed slurry mixing tank 100 that can realize fully automatic slurry mixing.

[0051] Figure 4 The figure is a flow chart of a slurry mixing method 200 according to an embodiment of the present invention. The slurry mixing method 200 is applied to the fully enclosed slurry mixing tank 100 of the cementing pump skid that can realize fully automatic slurry mixing, and includes: S01, providing a closed tank body 1, a gas diffusion groove 11 is provided on the top of the closed tank body, a slurry inlet 12 is formed on the gas diffusion groove 11, and a discharge port 13 and a sewage outlet 14 are provided on the bottom of the closed tank body 1; S02, providing a slurry mixing device 2, which is connected to the slurry inlet 12, and the slurry mixing device 2 is used for prefabrication of slurry; S03, providing a dust removal device 3, which is connected to the gas diffusion groove 11, and the dust removal device 3 is used for collecting dust in the closed tank body 1; S04, providing a stirring device 4, which is arranged inside the closed tank body 1, and the stirring device 4 is used to stir the slurry in the closed tank body 1; S05, providing a flushing device 5, which is arranged inside the closed tank body 1 and connected to an external water source.

[0052] Through the above-mentioned settings, in this application, combined with the multiple practices of production personnel, it is obtained that when the stirring device 4 stirs the slurry through the stirring blade 43, the set speed of the stirring blade 43 can be set to 500rpm through the driving device 41. At this speed, the time to reach a stable stirring is greatly shortened. Continuing to increase the speed can only slightly shorten the stable stirring time, but the stirring power will increase accordingly. Therefore, setting the set speed of the stirring blade 43 to 500rpm can be more suitable for the stirring of the slurry, and enable the slurry to be quickly and evenly mixed.

[0053] It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0054] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A fully enclosed cementing pump skid slurry mixing tank capable of fully automatic slurry mixing, characterized in that: include: A closed tank body is provided with a gas diffusion groove on the top, a slurry inlet is formed on the gas diffusion groove, and a discharge outlet and a sewage outlet are provided at the bottom of the closed tank body; A slurry mixing device, which is connected to the slurry mixing inlet and is used for prefabrication of slurry; a dust removal device, which is in communication with the gas diffusion groove and is used to collect dust in the closed tank; A stirring device is provided inside the closed tank body, and is used to stir the slurry inside the closed tank body; a flushing device, which is arranged inside the closed tank and connected to an external water source; The stirring device comprises: a driving device fixed to the top of the closed tank; A rotating shaft connected to the driving device and arranged vertically inside the closed tank; and A stirring blade is provided on the rotating shaft and is located in the middle of the closed tank body; The rotating shaft is arranged to have an angle ranging from 10° to 20° with respect to the vertical direction, and the stirring blade is arranged to have a vertical distance ranging from 200mm to 400mm from the bottom of the closed tank body; The bottom of the closed tank body is provided with at least two discharge ports, wherein one of the two discharge ports is used to connect to a circulating centrifugal pump to achieve remixing of the slurry in the closed tank body; the other of the two discharge ports is used to output the slurry to the outside through a booster centrifugal pump; A weir plate is provided in the closed tank body along the vertical direction, and a weir flow space is formed between the top of the weir plate and the top of the closed tank body. A valve body is provided on the weir plate, and the weir plate divides the interior of the closed tank body into a mixing chamber and a balancing chamber, wherein the mixing inlet is provided above the mixing chamber, and the mixing chamber and the balancing chamber are both provided with the stirring device, and at the same time, the mixing chamber and the balancing chamber are both provided with the discharge outlet and the sewage outlet.

2. The fully enclosed slurry mixing tank capable of fully automatic slurry mixing according to claim 1 is characterized in that: The flushing device includes a tube body arranged around the inner wall of the closed tank body, the liquid inlet end of the tube body is used to be connected to an external jet pump, and a plurality of spray holes are formed on the part of the tube body located inside the closed tank body, and the plurality of spray holes are arranged toward the tank wall and interior of the closed tank body.

3. The fully enclosed slurry mixing tank capable of fully automatic slurry mixing according to claim 1 is characterized in that: The bottom surface of the closed tank body is constructed as an inclined surface and a plane connected to the inclined surface. The discharge port and the sewage outlet are both arranged on the side wall of the bottom of the closed tank body and located at the position of the plane. The discharge port and the sewage outlet are both provided with filtering devices.

4. The fully enclosed slurry mixing tank capable of fully automatic slurry mixing according to claim 1 is characterized in that: At least two breathing caps are further provided on the top of the closed tank body, and the two breathing caps are respectively provided above the slurry mixing chamber and the equalizing chamber.

5. The fully enclosed slurry mixing tank capable of fully automatic slurry mixing according to claim 1 is characterized in that: Two liquid level detection devices are further provided inside the closed tank body, and the two liquid level detection devices are respectively provided in the mixing chamber and the balancing chamber.

6. The fully enclosed slurry mixing tank for cementing pump skid capable of achieving fully automatic slurry mixing according to any one of claims 1 to 3, characterized in that: The top of the closed tank body is also provided with an inspection hole, which is used for inspection of the interior of the closed tank body.

7. A slurry mixing method, applied to a fully enclosed slurry mixing tank capable of fully automatic slurry mixing in a cementing pump skid according to any one of claims 1 to 6, characterized in that: include: A closed tank body is provided, a gas diffusion groove is provided on the top of the tank body, a slurry mixing inlet is formed on the gas diffusion groove, and a discharge outlet and a sewage outlet are provided on the bottom of the closed tank body; Providing a slurry mixing device, connected to the slurry mixing inlet, the slurry mixing device is used for pre-making the slurry; Providing a dust removal device, connected to the gas diffusion tank, the dust removal device is used to collect dust in the closed tank; Providing a stirring device, which is arranged inside the closed tank body, and the stirring device is used to stir the slurry in the closed tank body; A flushing device is provided, which is arranged inside the closed tank and connected to an external water source.

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