Automatic tank cleaning device and method and solid control system

Abstract

The invention relates to an automatic tank cleaning device and method and a solid control system. The device comprises a circulating pipe, a first nozzle, a second nozzle and a power pump, the power pump pumps slurry to the circulating pipe, the circulating pipe is used for surrounding the storage tank, and the multiple first nozzles and the multiple second nozzles are arranged at intervals along the path of the circulating pipe and communicate with the circulating pipe; the first nozzle is used for spraying towards the side wall of the storage tank and / or the bottom wall of the storage tank, and the second nozzle is used for spraying towards the joint of two adjacent side walls of the storage tank and / or the joint of the side wall and the bottom wall of the storage tank; the working duration and the working interval time of the power pump are controlled to form a pulse period, so that the first nozzle and the second nozzle can intermittently spray sediments in the storage tank, the sediments in the storage tank are impacted to continuously suspend, the sediments are loosened online in real time, the sediments are in a suspended state, deposition is avoided, and the service life of the storage tank is prolonged. Finally, automatic tank cleaning is achieved, manual tank entering cleaning is not needed, efficiency is improved, and risks are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas field drilling and production industry, and in particular to an automatic tank cleaning device, method and solid control system. Background Art

[0002] During oil and gas field drilling, solid deposits form at the bottom of the drilling fluid tank (solids control system mud tank) during the circulation of drilling fluid in the solids control system. These deposits, primarily consisting of drill cuttings, bentonite, and barite, are concentrated at the bottom and surrounding corners of the drilling fluid mud tank. The gradual accumulation of solid deposits not only reduces the effective circulation volume within the tank, but also impacts drilling safety. Furthermore, the deposits become increasingly compacted and difficult to clean.

[0003] In related technologies, a common tank cleaning method at a well site involves manually entering the tank and digging up the sediment inside to loosen it for suction. The sediment is then sucked out of the tank using equipment such as a vacuum pump. On average, two people and one device can clean one to 1.5 tanks per day. Conventional drilling rigs have at least seven tanks in their solids control system, and this method takes at least three to five days. This method is labor-intensive, inefficient, and carries a high risk of personal injury. Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic tank cleaning device, method and solid control system to solve the technical problems existing in the related art.

[0005] The present invention provides an automatic tank cleaning device, method and solid control system, which loosens sediments online in real time to put them in a suspended state to avoid deposition, ultimately achieving automatic tank cleaning without the need for manual tank cleaning, thereby improving efficiency and reducing risks.

[0006] The present invention is implemented as follows: In a first aspect, the present invention provides an automatic tank cleaning device, comprising a circulation pipe, a first nozzle, a second nozzle and a power pump;

[0007] The power pump pumps slurry into the circulation pipe, the circulation pipe is arranged to surround the storage tank, and the plurality of first nozzles and the plurality of second nozzles are arranged at intervals along the path of the circulation pipe and are communicated with the circulation pipe;

[0008] The first nozzle is used to spray toward the side wall and / or the bottom wall of the storage tank, and the second nozzle is used to spray toward the connection between the adjacent two side walls of the storage tank and / or the connection between the side wall and the bottom wall of the storage tank;

[0009] The working time and working interval of the power pump are controlled to form a pulse cycle, so that the first nozzle and the second nozzle can intermittently spray the sediment in the storage tank, thereby impacting the sediment in the storage tank into continuous suspension.

[0010] A further technical solution of the present invention is that the spraying surfaces of two adjacent first nozzles can form an intersection at the side wall and / or bottom wall of the storage tank, and the spraying surfaces of the adjacent first nozzle and second nozzle can form an intersection at the connection of the adjacent two side walls of the storage tank and / or the connection between the side wall and the bottom wall of the storage tank.

[0011] A further technical solution of the present invention is: the first nozzle is used to spray the liquid in a fan shape, and the second nozzle is used to spray the liquid in a triangle shape.

[0012] A further technical solution of the present invention is: the first nozzle liquid outlet is configured as a strip, a constriction section is provided between the first nozzle liquid inlet and liquid outlet; the second nozzle liquid outlet is configured as a triangle.

[0013] A further technical solution of the present invention is: the automatic tank cleaning device also includes a first pipeline, a human-machine interface and a control center, the liquid outlet of the storage tank is connected to the power pump inlet through the first pipeline, the circulation pipe is connected to the power pump outlet, and the power pump is communicated with the human-machine interface through the control center.

[0014] A further technical solution of the present invention is: the automatic tank cleaning device also includes a centrifuge, the inlet of the centrifuge is connected to the outlet of the power pump, the centrifuge is communicatively connected to the human-machine interface through the control center, and the centrifuge is provided with a liquid phase outlet connected to the storage tank.

[0015] A further technical solution of the present invention is: the automatic tank cleaning device also includes a three-way pipeline, the centrifuge is also provided with a solid phase outlet, the three-way pipeline has an input end, a first output end and a second output end, the solid phase outlet is connected to the input end, the first output end is used for waste residue discharge, and the second output end is used for material recovery.

[0016] In a second aspect, the present invention provides an automatic tank cleaning method, the method is based on the automatic tank cleaning device, the tank cleaning device includes a centrifuge;

[0017] The tank cleaning method includes selecting at least one of a pulse suspension tank cleaning mode, a centrifugal slag discharge mode, and a centrifugal recovery mode according to the type of mud and the state of sediment in the tank.

[0018] A further technical solution of the present invention is that the pulse suspension tank cleaning mode includes the following steps:

[0019] Obtain the type of mud and sediment settling velocity in the tank;

[0020] Setting the outlet pressure, working time and working interval of the power pump according to the mud type and sediment settling speed;

[0021] Mud is pumped to the first nozzle and the second nozzle by the power pump, the first nozzle sprays toward the side wall and / or the bottom wall of the tank and / or the connection between the side wall and the bottom wall of the tank, and the second nozzle sprays toward the connection between the adjacent two side walls of the tank and / or the connection between the side wall and the bottom wall of the tank, so that the sediment in the tank remains in a suspended state.

[0022] A further technical solution of the present invention is: the centrifugal slag discharge mode includes the following steps:

[0023] Obtain the mud type, mud density and solid phase particle size in the tank;

[0024] Based on the mud type, mud density and solid phase particle size value, when the mud density is greater than the density threshold set for the mud type, and the solid phase particle size is not greater than the particle size threshold set for the mud type, set the centrifuge speed and separation time, and start the centrifuge;

[0025] The power pump pumps the mud in the storage tank into the centrifuge. The mud is centrifuged to separate the solid and liquid phases. The liquid phase flows back into the storage tank and the solid phase is discharged.

[0026] A further technical solution of the present invention is that the centrifugal recovery mode comprises the following steps:

[0027] Obtain the mud type, mud density and solid phase particle size in the tank;

[0028] Based on the mud type, mud density and solid phase particle size values, when the mud density is greater than the density threshold set for the mud type, and the solid phase particle size is greater than the particle size threshold set for the mud type, the centrifuge speed and separation time are set, and the centrifuge is started;

[0029] The power pump pumps the mud in the storage tank into the centrifuge. The mud is centrifuged to separate the solid and liquid phases. The liquid phase flows back into the storage tank, and the solid phase is discharged and recovered.

[0030] In a third aspect, the present invention provides a solids control system comprising a plurality of storage tanks and the automatic tank cleaning device.

[0031] Through the above technical solution, the mud is pumped into the circulation pipe through a power pump, and the circulation pipe is arranged around the storage tank. The multiple first nozzles and multiple second nozzles arranged on the circulation pipe can spray and impact the positions in the storage tank that are difficult to be stirred by the agitator and prone to sedimentation.

[0032] It should be noted that since a solids control system may include multiple storage tanks of the same shape, the corresponding storage tank shapes may differ for different types of solids control systems. This means that the deposits formed in different storage tank shapes within different solids control systems will be deposited in different locations. In the present invention, the locations at which the multiple first nozzles and multiple second nozzles spray into the storage tanks can be set based on the specific shapes of the tanks. This is sufficient as long as the spraying can be directed to locations within the tanks of different shapes that are difficult to stir and prone to deposits, thereby preventing deposits from forming within the tanks.

[0033] Exemplarily, multiple first nozzles can spray toward the side wall of the tank, the bottom wall of the tank, or either one of the two, so that the area of ​​the tank that is difficult to be stirred by the agitator and is easy to deposit can be sprayed and impacted, so that the sediment in the area can be impacted and suspended in the tank, and can be carried away as the mud circulates, thereby avoiding deposition in the tank and completing the automatic cleaning of the tank; multiple second nozzles can spray toward the connection between the adjacent two side walls of the tank and the connection between the side wall and the bottom wall of the tank, or either one of the two, that is, spraying and impacting the angle formed between the adjacent two side walls of the tank and between the side wall and the bottom wall of the tank where solid-phase sediments are easily deposited, so that the sediment in the area can be impacted and suspended in the tank, and can be carried away as the mud circulates, thereby avoiding deposition in the tank and completing the automatic cleaning of the tank.

[0034] In addition, according to the characteristics such as the settling speed of the sediment, a pulse cycle can be formed by controlling the working time and working interval time of the power pump, that is, controlling the pulse working time and pulse time interval of the power pump to control the injection time and injection interval time of the first nozzle and the second nozzle, so that the first nozzle and the second nozzle can intermittently spray and impact the sedimentation area, so that the sediment in the sedimentation area can be continuously in a suspended state, preventing the sediment from settling and stacking, so that the storage tank can be efficiently cleaned while reducing the working time of the power pump.

[0035] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a front view of a double V-shaped storage tank of an automatic tank cleaning device provided by the present invention;

[0037] Figure 2 yes Figure 1 Side view of

[0038] Figure 3 yes Figure 1 A top view of

[0039] Figure 4 This is a front view of an arc-shaped storage tank of an automatic tank cleaning device provided by the present invention;

[0040] Figure 5 yes Figure 4 Side view of

[0041] Figure 6 This is a front view of a sloping bottom storage tank of an automatic tank cleaning device provided by the present invention;

[0042] Figure 7 yes Figure 6 Side view of

[0043] Figure 8 yes Figure 6 A top view of

[0044] Figure 9 This is a schematic diagram of the three-way structure between the first pipeline and the storage tank provided by the present invention;

[0045] Figure 10 3 is a three-view diagram of the first nozzle provided by the present invention, wherein: Figure 10 a is the main view cross-section, Figure 10 b is a side cross-sectional view, Figure 10 c is a top view;

[0046] Figure 11 3 is a three-view diagram of the second nozzle provided by the present invention, wherein: Figure 11 a is the main view cross-section, Figure 11 b is a side cross-sectional view, Figure 11 c is a top view;

[0047] Figure 12 is a schematic diagram of a human-machine interface provided by the present invention;

[0048] Figure 13 This is a layout diagram of an automatic tank cleaning device provided by the present invention.

[0049] Figure numerals: 1. Human-machine interface, 2. Control center, 3. Power pump, 4. First pipeline, 5. Circulation pipe, 6. Second nozzle, 7. Flange, 8. First nozzle, 9. Storage tank, 10. Agitator, 11. Centrifuge, 12. First output end, 13. Second output end, 21. Jet flow field simulation line, 101. First valve, 102. Second valve, 103. Third valve, 104. Fourth valve, 105. Fifth valve, 106. Sixth valve, 107. Seventh valve. DETAILED DESCRIPTION

[0050] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0051] According to a first aspect of the present invention, the present invention provides an automatic tank cleaning device, such as Figures 1-13 As shown, the automatic tank cleaning device includes a circulation pipe 5, a first nozzle 8, a second nozzle 6 and a power pump 3;

[0052] The power pump 3 pumps the slurry to the circulation pipe 5. The circulation pipe 5 is used to surround the storage tank 9. The plurality of first nozzles 8 and the plurality of second nozzles 6 are arranged at intervals along the path of the circulation pipe 5 and are all connected to the circulation pipe 5.

[0053] The first nozzle 8 is used to spray toward the side wall of the storage tank 9 and / or the bottom wall of the storage tank 9, and the second nozzle 6 is used to spray toward the connection between the adjacent two side walls of the storage tank 9 and / or the connection between the side wall and the bottom wall of the storage tank 9;

[0054] The working time and working interval of the power pump 3 are controlled to form a pulse cycle, so that the first nozzle 8 and the second nozzle 6 can intermittently spray the sediment in the storage tank 9, thereby impacting the sediment in the storage tank 9 into continuous suspension.

[0055] Through the above technical solution, the mud is pumped into the circulation pipe 5 through the power pump 3, and the circulation pipe 5 is arranged around the storage tank 9. The multiple first nozzles 8 and multiple second nozzles 6 arranged on the circulation pipe 5 can spray and impact the positions in the storage tank 9 that are difficult to be stirred by the agitator 10 and are prone to sedimentation.

[0056] It should be noted that since the solids control system includes multiple storage tanks 9 of the same shape, the corresponding storage tanks 9 in different solids control systems may have different shapes. In other words, the sediment formed in different storage tanks 9 of different shapes in different solids control systems will be deposited in different locations. In the present invention, the locations where the multiple first nozzles 8 and the multiple second nozzles 6 spray into the storage tanks 9 can be set according to the specific shapes of the storage tanks 9. As long as the spraying can be targeted at locations in the differently shaped storage tanks 9 that are difficult to stir by the agitator 10 and are prone to sedimentation, sedimentation within the storage tanks 9 can be avoided.

[0057] Exemplarily, multiple first nozzles 8 can spray toward both or either of the side walls of the storage tank 9 and the bottom wall of the storage tank 9, so that the area of ​​the storage tank 9 that is difficult to be stirred by the agitator 10 and is easy to deposit can be sprayed and impacted, so that the sediment in the area can be impacted and suspended in the storage tank 9, and can be carried away as the mud circulates, thereby avoiding deposition in the storage tank 9 and completing the automatic cleaning of the storage tank 9; multiple second nozzles 6 can spray toward both or either of the connection between the adjacent two side walls of the storage tank 9 and the connection between the side wall and the bottom wall of the storage tank 9, that is, spray impact is performed on the angle formed between the adjacent two side walls of the storage tank 9 and between the side wall and the bottom wall of the storage tank 9, where solid-phase sediments are easily deposited, so that the sediment in the area can be impacted and suspended in the storage tank 9, and can be carried away as the mud circulates, thereby avoiding deposition in the storage tank 9 and completing the automatic cleaning of the storage tank 9.

[0058] In addition, according to the characteristics such as the settling speed of the sediment, a pulse cycle can be formed by controlling the working time and working interval time of the power pump 3, that is, controlling the pulse working time and pulse time interval of the power pump 3 to control the injection time and injection interval time of the first nozzle 8 and the second nozzle 6, so that the first nozzle 8 and the second nozzle 6 can intermittently perform injection impact on the sedimentation area, so that the sediment in the sedimentation area can be continuously in a suspended state, preventing the sediment from settling and stacking, so that the storage tank 9 can be efficiently cleaned while reducing the working time of the power pump 3.

[0059] In the present invention, the storage tanks 9 used in the solids control system have various shapes, including double V-shaped storage tanks 9, sloping bottom storage tanks 9 and arc-shaped storage tanks 9. For storage tanks 9 of different shapes, the positions of the first nozzle 8 and the second nozzle 6 are different. As long as the sediments in storage tanks 9 of different shapes can be cleaned, the following describes the settings of the circulation pipe 5, the first nozzle 8 and the second nozzle 6 of the three shapes of storage tanks 9 respectively.

[0060] like Figure 1-Figure 3 The bottom of the double-V-shaped storage tank 9 is composed of inclined sidewalls and a bottom wall. Therefore, a sedimentation area is easily formed on the inclined sidewalls and bottom wall of the double-V-shaped storage tank 9. Based on this, in order to clean the sedimentation area of ​​the double-V-shaped storage tank 9 and reduce the sediment in the tank, a circulation pipe 5 is installed in the bend section of the double-V-shaped storage tank 9. In other words, a circle of circulation pipe 5 is set around the intersection of the vertical sidewalls and the inclined sidewalls of the double-V-shaped storage tank 9, and multiple first nozzles 8 and second nozzles 6 are installed on the circulation pipe 5 at intervals.

[0061] In addition, the first nozzle 8 is configured to impact the sediment on the inclined side wall and the bottom wall below, so that the sediment on the inclined side wall and the bottom wall can be impacted and suspended in the storage tank 9. In addition, in order to better impact the sediment on the bottom wall of the double V-shaped storage tank 9, the circulation pipe 5 includes a branch pipe that can extend to the bottom wall of the storage tank 9. A first nozzle 8 facing the bottom wall can be provided at the outlet of the branch pipe. The first nozzle 8 can directly spray and impact the sediment on the bottom wall, so that the sediment on the bottom wall can be further completely impacted and suspended in the double V-shaped storage tank 9; the second nozzle 6 is configured to spray and impact the sediment within the angle formed by the intersection of the inclined side wall and the vertical side wall below, that is, to spray and impact the sediment remaining at the four corners of the double V-shaped storage tank 9, so that the sediment remaining at the four corners of the double V-shaped storage tank 9 can be impacted and suspended in the double V-shaped storage tank 9, and then used together with the first nozzle 8 to achieve the purpose of completely cleaning the double V-shaped storage tank 9 and preventing deposition.

[0062] like Figure 4 and Figure 5 The bottom of the arc-shaped storage tank 9 is composed of an arc bottom wall and a portion of vertical side walls. Therefore, a sedimentation area is easily formed on the arc bottom wall of the arc-shaped storage tank 9. Based on this, in order to clean the sedimentation area of ​​the arc-shaped storage tank 9 and reduce the sediment in the tank, a circle of circulation pipes 5 is installed at the intersection of the arc section and the vertical section of the arc-shaped storage tank 9, and multiple first nozzles 8 and second nozzles 6 are installed on the circulation pipes 5 at intervals.

[0063] In addition, similar to the setting of the double V-shaped storage tank 9, the first nozzle 8 is set to impact the sediment on the arc bottom wall below, so that the sediment on the arc bottom wall can be impacted and suspended in the arc-shaped storage tank 9. Moreover, based on the structure of the arc-shaped bottom wall, the most sediment will be deposited at the lowest point of the arc-shaped bottom wall. In order to better impact the sediment on the arc-shaped bottom wall of the arc-shaped storage tank 9, the circulation pipe 5 includes a branch pipe that can extend to the lowest point of the arc-shaped storage tank 9. A first nozzle 8 facing the center of the arc-shaped bottom wall can be set at the outlet of the branch pipe, so that the sediment on the arc-shaped bottom wall can be further completely impacted and suspended in the arc-shaped storage tank 9; the second nozzle 6 is set to spray and impact the sediment within the angle formed by the intersection of the lower arc-shaped bottom wall and the vertical side wall, that is, to spray and impact the sediment remaining at the four corners of the arc-shaped storage tank 9, so that the sediment remaining at the four corners of the arc-shaped storage tank 9 can be impacted and suspended in the arc-shaped storage tank 9, and then used together with the first nozzle 8 to achieve the purpose of completely cleaning the arc-shaped storage tank 9 and preventing deposition.

[0064] like Figure 6-Figure 8The bottom of the sloping bottom storage tank 9 is composed of an inclined bottom wall. Therefore, a sedimentation area is easily formed on the inclined bottom wall of the bottom of the sloping bottom storage tank 9. Based on this, in order to clean the sedimentation area of ​​the sloping bottom storage tank 9 and reduce the sediment in the tank, a circle of circulation pipes 5 is directly set at the edge of the bottom of the sloping bottom storage tank 9, and multiple first nozzles 8 and second nozzles 6 are arranged at intervals on the circulation pipes 5.

[0065] In addition, the first nozzle 8 is configured to impact the sediment on the inclined bottom wall, so that the sediment on the inclined bottom wall can be impacted and suspended in the inclined bottom tank 9. The second nozzle 6 is configured to spray and impact the sediment within the angle formed by the intersection of two adjacent vertical side walls, that is, to spray and impact the sediment remaining in the four corners of the inclined bottom tank 9, so that the sediment remaining in the four corners of the inclined bottom tank 9 can be impacted and suspended in the inclined bottom tank 9, and then used together with the first nozzle 8 to achieve the purpose of completely cleaning the inclined bottom tank 9 and preventing sedimentation.

[0066] In the present invention, the spraying surfaces of two adjacent first nozzles 8 can intersect at the side walls and / or bottom wall of the storage tank 9, and the spraying surfaces of adjacent first nozzles 8 and second nozzles 6 can intersect at the connection between the adjacent two side walls of the storage tank 9 and / or the connection between the side wall and the bottom wall of the storage tank 9. In this arrangement, the spraying surfaces formed by the multiple first nozzles 8 and the spraying surfaces formed by the multiple second nozzles 6 can completely cover the sediment area in the storage tank 9, thereby being able to fully clean the sediment area in the storage tank 9.

[0067] Since the first nozzle 8 is aimed at the wall surface of the storage tank 9 for spraying impact, the first nozzle 8 needs to be able to cover a larger area for spraying. Therefore, in order to expand the spraying area of ​​the first nozzle 8 while reducing the direct impact pressure, the first nozzle 8 is configured to spray the liquid in a fan shape, which is beneficial to impact the sediment on the wall surface and make it form a suspended state; since the second nozzle 6 is aimed at effectively impacting the angle formed between the adjacent two side walls of the storage tank 9 and / or between the side wall and the bottom wall of the storage tank 9, which is easy to deposit solid-phase sediments, so in order for the fluid sprayed by the second nozzle 6 to adapt to the formed angle and more closely fit the shape of the connection for impact, the second nozzle 6 is configured to spray the liquid in a triangular shape, which is beneficial to impact the sediment at the connection and make it form a suspended state. As an exemplary embodiment, as Figures 1-8 As shown, for different tank shapes of storage tanks 9, by using digital simulation calculation and hydraulic flow field model calculation analysis, a spray flow field simulation line 21 is simulated to simulate the area covered by the sprayed liquid, so as to provide a reference for the design of the first nozzle 8 and the second nozzle 6. Figure 10As shown, the liquid outlet of the first nozzle 8 can be set to be long and narrow, and a constriction section is provided between the liquid inlet and the liquid outlet of the first nozzle 8, so that the liquid surface sprayed from the first nozzle 8 is fan-shaped to achieve the purpose of expanding the spraying area and reducing the direct pressure; Figure 11 As shown, the liquid outlet of the second nozzle 6 can be set to a triangle, so that the liquid column ejected from the second nozzle 6 can better adapt to the angle formed at the connection, and more closely fit the shape of the connection to impact the angle and the bottom of the angle, thereby ensuring the overall cleaning effect of the storage tank 9.

[0068] In the present invention, the automatic tank cleaning device also includes a first pipeline 4, a human-machine interface 1 and a control center 2. The liquid outlet of the storage tank 9 is connected to the inlet of the power pump 3 through the first pipeline 4, and the circulation pipe 5 is connected to the outlet of the power pump 3. The power pump 3 is connected to the human-machine interface 1 through the control center 2. Since the sediment and sedimentation rate in different types of mud are quite different, such a setting can be used to set up a variety of pulse suspension schemes for muds with different characteristics. Each pulse suspension scheme corresponds to a different working parameter of the power pump 3. Each suspension scheme is preset and stored in the control center 2. Different types of suspension schemes can be selected through the human-machine interface 1 according to the mud characteristics, realizing one-button self-start, so that the power pump 3 pumps the mud in the storage tank 9 into the circulation pipe 5 through the first pipeline 4. The circulation pipe 5 sprays toward the bottom and corners of the storage tank 9 through the first nozzle 8 and the second nozzle 6 to achieve suspension of the sediment. As an exemplary embodiment, the power pump 3 can be a screw pump.

[0069] Here, the mud state in the above-mentioned storage tank 9 can be determined by manual sampling or by the existing mud online monitoring system. According to the obtained mud state in the storage tank 9, different cleaning modes are selected through the human-machine interface 1, and then the control center starts the power pump 3 and the valves on the corresponding pipeline according to the selected model to perform corresponding cleaning operations.

[0070] In addition, under the working condition that the suspended sediment in the storage tank 9 continues to increase, in order to separate and clean the excess sediment and maintain the performance of the mud, in the present invention, the automatic tank cleaning device also includes a centrifuge 11. The inlet of the centrifuge 11 is connected to the outlet of the power pump 3. The centrifuge 11 is connected to the human-machine interface 1 through the control center 2. The centrifuge 11 is provided with a liquid phase outlet connected to the storage tank 9. Similarly, a variety of centrifugal separation schemes can be set according to the properties of the mud and sediment with different characteristics. Each centrifugal separation scheme is preset and stored in the control center 2. Different suspension schemes can be selected through the human-machine interface 1 according to the properties of the mud and the sediment, and one-button self-start is achieved, so that the mud in the storage tank 9 is pumped into the centrifuge 11 through the power pump 3. The mud undergoes solid-liquid separation in the centrifuge 11 and then enters the storage tank 9 to maintain the performance of the mud.

[0071] At the same time, in order to recycle the usable solid-phase material produced after centrifugal separation, in the present invention, the automatic tank cleaning device also includes a three-way pipe, and the centrifuge 11 is also provided with a solid-phase outlet. The three-way pipe has an input end, a first output end 12 and a second output end 13. The solid-phase outlet is connected to the input end, the first output end 12 is used for waste discharge, and the second output end 13 is used for material recovery. Here, it is necessary to judge whether to recycle based on the particle size of the solid-phase material and the preset particle size value. If the particle size of the solid-phase material separated by centrifugation is not greater than the preset particle size value, it is used for waste discharge through the first output end 12; if the particle size of the solid-phase material separated by centrifugation is greater than the preset particle size value, it is used for material recovery through the second output end 13, thereby reducing economic losses.

[0072] In the present invention, a seventh valve 107 and a sixth valve 106 are sequentially positioned along the flow direction of the liquid in the first pipeline 4; a first valve 101 is positioned on the circulation pipe 5; a second valve 102 is positioned on the pipeline between the outlet of the power pump 3 and the inlet of the centrifuge 11; a third valve 103 is positioned on the pipeline connecting the centrifuge 11 and the storage tank 9; a fourth valve 104 is positioned on the second output end 13 of the three-way pipeline at the outlet of the centrifuge 11; and a fifth valve 105 is positioned on the first output end 11 of the three-way pipeline. All of the aforementioned valves may be electrically controlled valves and are electrically connected to the control center 2.

[0073] In some embodiments, combined Figure 9 and Figure 13 The first pipeline 4 can also be connected to the liquid outlet of the storage tank 9 via a tee. One outlet of the tee is connected to the first pipeline 4 via the seventh valve 107, and the other outlet is connected to a removable flange 7. This optimizes the elimination of the original sewage pipeline of the mud storage tank 9 and directly uses the water supply and suction pipeline of the power pump 3 to open a spare tee outlet as a sewage and sand removal port, saving costs. When the tank needs to be cleaned, the seventh valve 107 automatically opens to perform the pulse suspension operation. If special circumstances require manual tank cleaning and sewage discharge, the seventh valve 107 and the cover of the flange 7 can also be manually opened to perform the sewage discharge operation.

[0074] According to the second aspect of the present invention, the present invention also provides an automatic tank cleaning method, which is based on the above-mentioned automatic tank cleaning device, and the tank cleaning device includes a centrifuge 11; the tank cleaning method includes selecting at least one of the pulse suspension tank cleaning mode, centrifugal slag discharge mode and centrifugal recovery mode according to the type of mud and the state of the sediment in the storage tank 9. In addition, the automatic tank cleaning device includes a human-machine interface 1 and a control center 2. Any one, any two or all three of the pulse suspension tank cleaning mode, centrifugal slag discharge mode and centrifugal recovery mode can be preset in the control center 2, and can be selected as needed on the human-machine interface 1 to achieve one-button self-start, realize automatic tank cleaning, improve efficiency and protect the environment. Here, the mud types include water-based mud and oil-based mud.

[0075] In addition, each compartment of the storage tank 9 can be equipped with an ultrasonic or radar level sensor. For example, a dual-frequency ultrasonic level gauge can simultaneously measure the depth of the slurry level in the storage tank 9 and the thickness of the sediment at the bottom of the tank. When sediment thickness data is detected, an alarm is triggered, prompting the need for tank cleaning. Based on the current slurry characteristics, the control center 2 can automatically select and execute pulse suspension tank cleaning mode, centrifugal slag discharge mode, and centrifugal recovery mode, further reducing the labor and time costs of tank cleaning, saving energy and protecting the environment, and bringing more significant benefits.

[0076] Optionally, the pulse suspension tank cleaning mode includes the following steps: obtaining the mud type and sedimentation velocity of the sediment in the storage tank 9; setting the outlet pressure, working time and working interval time of the power pump 3 according to the mud type and sedimentation velocity; pumping mud to the first nozzle 8 and the second nozzle 6 through the power pump 3, and the first nozzle 8 sprays toward the side wall of the storage tank 9 and / or the bottom wall of the storage tank 9 and / or the connection between the side wall and the bottom wall of the storage tank 9, and the second nozzle 6 sprays toward the connection between the adjacent two side walls of the storage tank 9 and / or the connection between the side wall and the bottom wall of the storage tank 9, so that the sediment in the storage tank 9 remains in a suspended state.

[0077] Specifically, the type of mud can be water-based mud or oil-based mud. The sediments and sedimentation rates of water-based mud and oil-based mud are quite different. Based on this, the pulse suspension tank cleaning mode includes a water-based mud tank cleaning mode and an oil-based mud tank cleaning mode, which can be selected through the human-machine interface 1. The water-based mud tank cleaning mode and the oil-based mud tank cleaning mode can both be set to automatic mode and include three parameters that have been set accordingly: the outlet pressure of the power pump 3, the working time of the power pump 3, and the working interval time of the power pump 3. For example, for water-based mud, the density is relatively high and the viscosity is relatively low, which makes it easy to settle and stack. The outlet pressure of the power pump 3 can be increased, the working time of the power pump 3 can be increased, and the working interval time of the power pump 3 can be shortened. For oil-based mud, the density is relatively low and the viscosity is relatively high, which makes it difficult to settle and stack. The outlet pressure of the power pump 3 can be reduced, the working time of the power pump 3 can be shortened, and the working interval time of the power pump 3 can be increased. As an example, the water-based mud cleaning mode can be configured with a pump outlet pressure of 0.6 MPa, a pump jet shock operating time of 40 minutes, and a pulse interval of 6 hours. The oil-based mud cleaning mode can be configured with a pump outlet pressure of 0.4 MPa to 0.6 MPa, a pump jet shock operating time of 20 minutes, and a pulse interval of 8 hours. Furthermore, mud viscosity and density information from well logging data can be selected online in real time for optimization and adjustment.

[0078] In actual operation, the automatic mode is selected on the human-machine interface 1 according to the corresponding mud type and started with one click. For example, if the mud is detected to be water-based mud, the automatic mode corresponding to water-based mud is selected on the human-machine interface 1, and it is automatically started with one click. A command is issued through the control center 2 to control the power pump 3 and the first valve 101, the sixth valve 106, and the seventh valve 107 to open and execute the corresponding tank cleaning command.

[0079] In other embodiments, both the water-based mud tank cleaning mode and the oil-based mud tank cleaning mode can also be set in manual mode, and both can be selected through the human-machine interface 1. According to actual conditions, the three parameters of the power pump 3 outlet pressure, the power pump 3 working time and the power pump 3 working interval time can be set on the human-machine interface 1.

[0080] Under the working condition that the suspended sediment in the storage tank 9 continues to increase, it is necessary to centrifuge the mud in the storage tank 9 and discharge the excess waste residue such as drill cuttings. Optionally, the centrifugal discharge mode includes the following steps: obtaining the mud type, mud density and solid phase particle size in the storage tank 9; based on the mud type, mud density and solid phase particle size values, when the mud density is greater than the density threshold set corresponding to the mud type, and the solid phase particle size is not greater than the particle size threshold set corresponding to the mud type, setting the speed and separation time of the centrifuge 11, and starting Centrifuge 11; open the second valve 102, the seventh valve 107 and the sixth valve 106, the mud in the storage tank 9 can enter the power pump 3 through the first pipeline 4, the power pump 3 pumps the mud into the centrifuge 11, and the mud is separated into solid and liquid phases through centrifugal treatment in the centrifuge 11. Open the third valve 103, the liquid phase can flow back into the storage tank 9 through the pipeline between the centrifuge 11 and the storage tank 9, and the solid phase enters the three-way pipeline. Open the fifth valve 105 on the first output end 12, and the solid phase can be discharged through the first output end 12.

[0081] In addition, depending on whether the type of mud is water-based mud or oil-based mud, the centrifugal discharge mode includes a water-based mud centrifugal discharge mode and an oil-based mud centrifugal discharge mode, and can be selected through the human-machine interface 1. The water-based mud centrifugal discharge mode and the oil-based mud centrifugal discharge mode can both be set to automatic mode, and include two parameters that have been set accordingly: the separation time of the centrifuge 11 and the speed of the centrifuge 11.

[0082] In addition, both the water-based mud centrifugal discharge mode and the oil-based mud centrifugal discharge mode can be set in manual mode, and both can be selected through the human-machine interface 1. The two parameters of the separation time of the centrifuge 11 and the speed of the centrifuge 11 can be set on the human-machine interface 1 according to actual conditions.

[0083] In other embodiments, the centrifugal slag discharge mode may also include the following steps: obtaining the mud type and sediment density in the storage tank 9; based on the mud type and sediment density data, when the sediment density is greater than the threshold value corresponding to the mud type, starting the centrifuge 11, and setting the speed and separation time of the centrifuge 11; the mud in the storage tank 9 is pumped to the centrifuge 11 along the first pipeline 4 through the power pump 3, and the mud is centrifugally separated by the centrifuge 11 to form a solid-liquid two-phase; obtaining the particle size of the solid phase layer, when the particle size of the solid phase is not greater than the preset value, discharging the liquid phase into the storage tank 9 through the liquid phase outlet of the centrifuge 11, and discharging the solid phase through the solid phase outlet of the centrifuge 11.

[0084] Under the above working conditions, when it is necessary to recycle and reuse the precious well-killing raw materials such as barite obtained by centrifugal separation of the mud in the storage tank 9, optionally, the centrifugal recovery mode includes the following steps: obtaining the mud type, mud density and solid phase particle size in the storage tank 9; based on the mud type, mud density and solid phase particle size values, when the mud density is greater than the density threshold value set corresponding to the mud type, and the solid phase particle size is greater than the particle size threshold value set corresponding to the mud type, setting the speed and separation time of the centrifuge 11, and starting the centrifuge 11; starting the centrifuge 11; Open the second valve 102, the seventh valve 107 and the sixth valve 106, and the mud in the storage tank 9 can enter the power pump 3 through the first pipeline 4. The power pump 3 pumps the mud along the pipeline between the power pump 3 and the centrifuge 11 into the centrifuge 11. The mud is centrifuged in the centrifuge 11 to separate into solid and liquid phases. The liquid phase can flow back into the storage tank 9 through the pipeline between the centrifuge 11 and the storage tank 9, and the solid phase enters the three-way pipeline. Open the fourth valve 104 on the second output end 13, and the solid phase is discharged through the second output end 13 and recovered.

[0085] In the present invention, since the centrifugal recovery mode and the centrifugal slag discharge mode only process the separated different solid phases respectively, the processes of the two are basically the same. Therefore, the centrifugal recovery mode includes the water-based mud centrifugal recovery mode and the oil-based mud centrifugal recovery mode. The water-based mud centrifugal recovery mode and the oil-based mud centrifugal recovery mode can also be set to a manual mode, which will not be repeated here.

[0086] In other embodiments, the centrifugal slag discharge mode may also include the following steps: obtaining the mud type and sediment density in the storage tank 9; based on the mud type and sediment density data, when the sediment density is greater than the threshold value corresponding to the mud type, starting the centrifuge 11, and setting the speed and separation time of the centrifuge 11; the mud in the storage tank 9 is pumped to the centrifuge 11 along the first pipeline 4 through the power pump 3, and the mud is centrifugally separated by the centrifuge 11 to form a solid-liquid two-phase; obtaining the particle size of the solid phase, when the particle size of the solid phase is greater than the preset value, discharging the liquid phase into the storage tank 9 through the liquid phase outlet of the centrifuge 11, and discharging and recovering the solid phase through the solid phase outlet of the centrifuge 11.

[0087] According to a third aspect of the present invention, the present invention further provides a solids control system, comprising a plurality of storage tanks 9 and the above-mentioned automatic tank cleaning device.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An automatic tank cleaning device, characterized in that: It comprises a circulation pipe (5), a first nozzle (8), a second nozzle (6) and a power pump (3); The power pump (3) pumps slurry to the circulation pipe (5), the circulation pipe (5) is used to be arranged around the storage tank (9), and the plurality of first nozzles (8) and the plurality of second nozzles (6) are arranged at intervals along the path of the circulation pipe (5) and are communicated with the circulation pipe (5); The first nozzle (8) is used to spray toward the side wall of the storage tank (9) and / or the bottom wall of the storage tank (9), and the second nozzle (6) is used to spray toward the connection between the adjacent two side walls of the storage tank (9) and / or the connection between the side wall and the bottom wall of the storage tank (9); The working time and working interval of the power pump (3) are controlled to form a pulse cycle, so that the first nozzle (8) and the second nozzle (6) can intermittently spray the sediment in the storage tank (9), thereby impacting the sediment in the storage tank (9) into continuous suspension.

2. The automatic tank cleaning device according to claim 1, characterized in that: The spraying surfaces of two adjacent first nozzles (8) can form an intersection at the side wall and / or bottom wall of the storage tank (9), and the spraying surfaces of the adjacent first nozzle (8) and second nozzle (6) can form an intersection at the connection of the adjacent two side walls of the storage tank (9) and / or the connection between the side wall and the bottom wall of the storage tank (9).

3. The automatic tank cleaning device according to claim 1, characterized in that: The first nozzle (8) is used to spray the liquid in a fan shape, and the second nozzle (6) is used to spray the liquid in a triangle shape.

4. The automatic tank cleaning device according to claim 3, characterized in that: The liquid outlet of the first nozzle (8) is arranged in an elongated strip shape, and a constriction section is provided between the liquid inlet and the liquid outlet of the first nozzle (8); The liquid outlet of the second nozzle (6) is arranged in a triangle shape.

5. An automatic tank cleaning device according to any one of claims 1 to 4, characterized in that: The automatic tank cleaning device further comprises a first pipeline (4), a human-machine interface (1) and a control center (2); the liquid outlet of the storage tank (9) is connected to the inlet of the power pump (3) via the first pipeline (4); the circulation pipe (5) is connected to the outlet of the power pump (3); and the power pump (3) is communicatively connected to the human-machine interface (1) via the control center (2).

6. The automatic tank cleaning device according to claim 5, characterized in that: The automatic tank cleaning device further comprises a centrifuge (11), the inlet of the centrifuge (11) is connected to the outlet of the power pump (3), the centrifuge (11) is communicatively connected to the human-machine interface (1) via the control center (2), and the centrifuge (11) is provided with a liquid phase outlet connected to the storage tank (9).

7. The automatic tank cleaning device according to claim 6, characterized in that: The automatic tank cleaning device further comprises a three-way pipeline, and the centrifuge (11) is further provided with a solid phase outlet, the three-way pipeline having an input end, a first output end (12) and a second output end (13), the solid phase outlet being connected to the input end, the first output end (12) being used for waste residue discharge, and the second output end (13) being used for material recovery.

8. An automatic tank cleaning method, characterized in that: The method is based on the automatic tank cleaning device according to any one of claims 1 to 7, wherein the tank cleaning device comprises a centrifuge (11); The tank cleaning method comprises selecting at least one of a pulse suspension tank cleaning mode, a centrifugal slag discharge mode and a centrifugal recovery mode according to the type of mud and the state of sediment in the storage tank (9).

9. The automatic tank cleaning method according to claim 8, characterized in that: The pulse suspension tank cleaning mode includes the following steps: Obtaining the type of mud and the settling velocity of sediment in the storage tank (9); The outlet pressure, working time and working interval of the power pump (3) are set according to the mud type and sediment settling speed; The power pump (3) pumps mud to the first nozzle (8) and the second nozzle (6), the first nozzle (8) sprays toward the side wall of the storage tank (9) and / or the bottom wall of the storage tank (9) and / or the connection between the side wall and the bottom wall of the storage tank (9), and the second nozzle (6) sprays toward the connection between the adjacent two side walls of the storage tank (9) and / or the connection between the side wall and the bottom wall of the storage tank (9), so that the sediment in the storage tank (9) is maintained in a suspended state.

10. The automatic tank cleaning method according to claim 8, characterized in that: The centrifugal slag discharge mode comprises the following steps: Obtaining the mud type, mud density and solid phase particle size in the storage tank (9); Based on the mud type, mud density and solid phase particle size value, when the mud density is greater than the density threshold value set corresponding to the mud type and the solid phase particle size is not greater than the particle size threshold value set corresponding to the mud type, the rotation speed and separation time of the centrifuge (11) are set, and the centrifuge (11) is started; The power pump (3) pumps the mud in the storage tank (9) into the centrifuge (11). The mud is centrifuged in the centrifuge (11) to separate the solid and liquid phases. The liquid phase flows back into the storage tank (9) and the solid phase is discharged.

11. The automatic tank cleaning method according to claim 8, characterized in that: The centrifugal recovery mode comprises the following steps: Obtaining the mud type, mud density and solid phase particle size in the storage tank (9); Based on the mud type, mud density and solid phase particle size value, when the mud density is greater than the density threshold value set corresponding to the mud type, and the solid phase particle size is greater than the particle size threshold value set corresponding to the mud type, the rotation speed and separation time of the centrifuge (11) are set, and the centrifuge (11) is started; The power pump (3) pumps the mud in the storage tank (9) into the centrifuge (11). The mud is centrifuged in the centrifuge (11) to separate the solid and liquid phases. The liquid phase flows back into the storage tank (9), and the solid phase is discharged and recovered.

12. A solid control system, characterized in that: The invention comprises a plurality of storage tanks (9) and the automatic tank cleaning device according to any one of claims 1 to 7.

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