Petroleum engineering automatic pressure control type efficient multifunctional skid-mounted tank

Abstract

The invention belongs to the technical field of petroleum drilling, and provides a petroleum engineering self-pressure-control type efficient multifunctional skid-mounted tank which comprises a bottom plate and a slurry preparing system skid-mounted on the front section of the bottom plate, and the slurry preparing system prepares various fluids in well drilling and completion operation through a sand pump and conveys the fluids into a storage tank; and the slurry storage stirring system is skid-mounted in the middle section of the bottom plate, is connected with the slurry preparation system, and is used for stirring the fluid in the storage tank prepared by the slurry preparation system by utilizing a stirrer. According to the invention, the defects of low efficiency, far distance from a wellhead, inconvenience in liquid supply and high possibility of pipeline blockage when a drilling fluid circulating tank is used for preparing high-density, high-viscosity and large-particle-containing plugging slurry and other working fluids at present are overcome; and meanwhile, the defects that the number of circulation tanks of the oil testing team is small, and underground complexity or accident handling technical means and equipment guarantee are limited are overcome, and underground complex handling technical measures are expanded.

Description

Technical Field

[0001] The present invention relates to the technical field of oil drilling, and more specifically, to an automatic pressure control type high-efficiency multi-functional skid-mounted tank for oil engineering. Background Art

[0002] The geological conditions of oil drilling are complex. During the drilling and workover operations, severe lost circulation often occurs, and the conversion speed between production layer spraying and lost circulation is fast. It is necessary to quickly prepare various special fluids such as high-concentration plugging slurry, gel, and high-water-loss solidifying fluid and pump them into the well. At present, there are the following problems in the preparation and construction of special fluids (such as plugging slurry, pipe sticking release fluid, gel, slug plugging fluid, sand-lifting thick slurry, etc.) during drilling and completion operations:

[0003] (1) It is easy to block the upper water pipeline and gate valve, and the dredging operation takes a long time, delaying the plugging opportunity and posing a high risk of downhole complex well control.

[0004] (2) Limited by the power of the weighting pump and the strength of the existing agitator, it is impossible to meet the preparation of high-concentration plugging slurry, and the problem of rigid particle precipitation is prominent, affecting the plugging effect.

[0005] (3) The number of configured circulation tanks cannot meet the requirements of multiple special operations and complex treatments at the same time. For example, in the complex well section with coexisting spraying and lost circulation, plugging and killing operations are required, and the demand for tanks is large, while the preparation efficiency of the existing weighting system is low; the number of circulation tanks configured by the well testing team is small, seriously affecting the complex treatment of coexisting spraying and lost circulation.

[0006] (4) When using the circulation tank to prepare pipe sticking release fluid and the plugging gel fluid required during the fine pressure control tripping in the narrow safety window of sulfur-bearing formations, it is easy to mix and flow, affecting the construction effect.

[0007] (5) The existing independent plugging slurry preparation tank cannot perform construction operations such as pumping, squeezing, and holding pressure for waiting for plugging. Summary of the Invention

[0008] In order to solve at least one problem in the background art, the present invention proposes an automatic pressure control type high-efficiency multi-functional skid-mounted tank for oil engineering.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] An automatic pressure control type high-efficiency multi-functional skid-mounted tank for oil engineering, comprising:

[0011] A bottom plate;

[0012] A slurry preparation system skid-mounted at the front section of the bottom plate, which uses a sand pump to prepare various fluids in drilling and completion operations and transports them to the storage tank;

[0013] A slurry storage and stirring system skid-mounted at the middle section of the bottom plate, which is connected to the slurry preparation system and uses an agitator to stir the fluid in the storage tank after being prepared by the slurry preparation system;

[0014] The heavy slurry circulation system skid-mounted at the rear section of the bottom plate, which is connected to the slurry storage and mixing system, uses a plugging pump to pump, squeeze and hold pressure for plugging of the fluid stirred by the slurry storage and mixing system;

[0015] The control system skid-mounted at the rear section of the bottom plate, which is respectively connected to the slurry preparation system, the slurry storage and mixing system and the heavy slurry circulation system and controls their operations.

[0016] Preferably, the slurry preparation system includes a sand pump, a mixing funnel, a bag breaker, a remote control jib crane and a rain shelter; the sand pump is installed on the bottom plate and communicated with the outlet of the mixing funnel through a pipeline, the bag breaker is assembled on the mixing funnel, the rain shelter is located above the inlet of the mixing funnel, and the remote control jib crane is installed at the bottom of the rain shelter for transporting raw materials above the mixing funnel.

[0017] Preferably, the mixing funnel includes a funnel, a funnel valve, a tee, a nozzle, an inlet reducer and a horn outlet;

[0018] The top inlet of the tee is connected to the bottom outlet of the funnel, the left inlet is connected to the outlet of the nozzle, the right outlet is connected to the horn outlet, the funnel valve is installed at the bottom outlet of the funnel, the outlet of the inlet reducer is connected to the inlet of the nozzle, the inlet of the inlet reducer is connected to the outlet of the sand pump through a pipeline, and the horn outlet is connected to the inside of the storage tank through a pipeline.

[0019] Preferably, the slurry storage and mixing system includes a storage tank, a stirrer and a liquid level detector. The storage tank is horizontally placed in the middle of the bottom plate. There are several groups of stirrers vertically inserted into the storage tank to stir the materials in the storage tank. The liquid level detector is installed on the storage tank and vertically inserted into the storage tank to detect the liquid level of the materials in the storage tank.

[0020] Preferably, the stirrer includes a base, a direct drive motor, a connecting flange, a stirring shaft and an impeller;

[0021] The base is installed at the top of the storage tank, the direct drive motor is installed on the base and frequency-controlled. The direct drive motor is connected to the stirring shaft through a connecting flange. The stirring shaft is vertically arranged in the storage tank, and the impeller is installed on the stirring shaft;

[0022] The impeller includes a lower impeller and an upper impeller. The lower impeller is a three-blade propeller type blade, and a draft tube is installed around it; the upper impeller is a four-blade open turbine type blade, and the upper impeller has two different diameter sizes and is detachably assembled.

[0023] Preferably, the heavy slurry circulation system includes a pump unit skid, a permanent magnet synchronous direct drive motor, a plugging pump, a spraying subsystem, and a lubricating subsystem. The pump unit skid is installed on the bottom plate. The permanent magnet synchronous direct drive motor and the plugging pump are both installed on the pump unit skid, and the permanent magnet synchronous direct drive motor directly drives the plugging pump. The plugging pump pumps, injects, and holds pressure for plugging the fluid stirred by the slurry storage and mixing system. The spraying subsystem is connected to the plugging pump to wash and cool the plugging pump. The lubricating subsystem is connected to the plugging pump to lubricate the plugging pump.

[0024] Preferably, the plugging pump is a 450HP plugging pump, which adopts a metal hollow spherical valve body structure, and the sealing surface of its pump valve body is a spherical line seal.

[0025] Preferably, the sand pump and the plugging pump are skidded and arranged on the bottom plate. A railing is provided at the top of the storage tank. The railing adopts a folding structure, and the remote control cantilever crane adopts a telescopic structure. The internal base plate of the storage tank adopts three inclined bottom plates connected in sequence. The middle inclined bottom plate inclines and shrinks towards one end. The connection between the inclined bottom plates and the connection between the inclined bottom plate and the storage tank wall panel are both arc-shaped transitions. It also includes a lighting system connected to the control system. The lighting system includes a movable lamp rack type illuminating lamp and a fixed hanging type illuminating lamp. The movable lamp rack type illuminating lamp is arranged on the storage tank, and the fixed hanging type illuminating lamps are respectively arranged on the slurry preparation system and the heavy slurry circulation system.

[0026] Preferably, the inlet pipe of the plugging pump is connected to the inside of the storage tank, and a first electric butterfly valve is provided thereon. The outlet pipe of the plugging pump is connected to the surface gate valve group or the drill floor gate valve group, and an electric gate valve is provided thereon.

[0027] The inlet pipe of the sand pump is connected to the inside of the storage tank, and a second electric butterfly valve is provided thereon. The inlet pipe of the sand pump is also connected with an external supplementary pipe, and a manual butterfly valve is provided on the external supplementary pipe.

[0028] The outlet pipe of the sand pump is connected to the inside of the storage tank, and a fifth electric butterfly valve and a mixing funnel of the skid-mounted tank slurry preparation system are provided on the rear section thereof.

[0029] A fourth electric butterfly valve is provided on the front section of the outlet pipe of the sand pump, and a first pipeline connecting to the inlet pipe of the plugging pump is connected in front of the fourth electric butterfly valve, and a third electric butterfly valve is provided on the first pipeline.

[0030] A second pipeline connecting to the outlet pipe of the plugging pump is also connected behind the fourth electric butterfly valve on the front section of the outlet pipe of the sand pump. A first ball valve and a manual gate valve are respectively provided at both ends of the second pipeline. The second pipeline is also connected with a cleaning pipeline. The cleaning pipeline communicates with the inside of the storage tank, a second ball valve is provided thereon, and a cleaning gun is connected to the end.

[0031] Preferably, the control system is connected to the first electric butterfly valve, the second electric butterfly valve, the third electric butterfly valve, the fourth electric butterfly valve, the fifth electric butterfly valve and the electric gate valve.

[0032] Advantages of the present invention:

[0033] The self-controlled pressure type high-efficiency multi-functional skid-mounted tank for petroleum engineering provided by the present invention overcomes many deficiencies of using a drilling fluid circulation tank of a drilling team to prepare various operation fluids, integrates and realizes the multi-functions of high-efficiency preparation, direct pumping into the well and pressure-holding squeezing injection, and provides important equipment guarantee for downhole complex or accident treatment construction such as malignant lost circulation treatment, leakage and overflow treatment in the same layer, overflow killing, stuck pipe treatment by injecting pipe release agent, etc. in the petroleum drilling industry. It also effectively cooperates with the operation of a large drilling fluid pump, greatly improving the equipment guarantee ability for solving downhole complexities. This skid-mounted tank played an important role in the lost circulation treatment construction of Well Aga-101D and Well Bush-102 on the right bank of the Amu Darya in Turkmenistan. It can not only quickly and efficiently prepare lost circulation slurries including gel lost circulation slurry, HHH lost circulation slurry and high-concentration bridging slurry, and gas-insulating gel, but also realize directly pumping the lost circulation slurry with a maximum concentration of 30%, a maximum particle size not greater than 5 mm, and a maximum density of 2.0 g / cm 3 into the well through a 450HP permanent magnet synchronous direct drive motor directly driving a lost circulation pump, and the key operation procedure of maximum pressure-holding of 10 MPa provides important equipment guarantee for the emergency treatment of downhole complexities. Compared with preparing lost circulation slurry with a circulation tank, using the present invention can save 25 - 50% of the lost circulation slurry preparation time and 20 - 25% of the lost circulation cost.

[0034] The self-controlled pressure type high-efficiency multi-functional skid-mounted tank for petroleum engineering provided by the present invention realizes the following multi-functions by introducing a direct drive motor directly driving an energy-saving stirrer, a 355KW permanent magnet synchronous direct drive motor directly driving a 450HP lost circulation pump and an automatic control system of electric butterfly valves, and cooperating with a high-power sand pump, a spare flange union connecting pipe, a union on the sand pump outlet pipeline and its extended pipeline: (1) High-efficiency preparation of operation fluids such as high-density, high-viscosity and containing large-particle lost circulation agents; (2) Directly pumping and pressure-holding various operation fluids to solve downhole complex or accident treatment construction operations; (3) The whole-process visual centralized control system realizes convenient, fast, safe and reliable operation. The present invention solves the defects of low efficiency, far from the wellhead, inconvenient liquid supply and easy pipeline blockage when using a drilling fluid circulation tank to prepare operation fluids such as high-density, high-viscosity and containing large-particle lost circulation slurry; at the same time, it solves the defects of few circulation tanks of a well testing team, limited technical means and equipment guarantee for solving downhole complexities or accidents, expands the downhole complex treatment technical measures, meets the equipment requirements for complex operation construction such as malignant lost circulation plugging, leakage and overflow treatment in the same layer, overflow killing, and pipe release agent injection for stuck pipe release, and has good application prospects.

[0035] Other features and advantages of the present invention will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the structure particularly pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings may be obtained based on these drawings.

[0037] Figure 1 It is a three-dimensional structure schematic diagram of the skid-mounted tank of the present invention;

[0038] Figure 2 It is a schematic diagram of the skid-mounted tank of the present invention;

[0039] Figure 3 It is a schematic diagram of the mixing funnel of the slurry preparation system of the present invention;

[0040] Figure 4 It is a schematic diagram of the agitator of the slurry storage and stirring system of the present invention;

[0041] Figure 5 It is a schematic diagram of the inner bottom plate of the storage tank of the present invention;

[0042] Figure 6 It is a schematic diagram of the overall process of the present invention;

[0043] Figure 7 It is a connection schematic diagram of the sand pump and the plugging pump of the present invention.

[0044] In the figure: 1. Control system; 101. First electric butterfly valve; 102. Second electric butterfly valve; 103. Third electric butterfly valve; 104. Fourth electric butterfly valve; 105. Fifth electric butterfly valve; 106. Electric gate valve; 107. Manual butterfly valve; 108. First ball valve; 109. Manual gate valve; 110. Second ball valve; 2. Slurry preparation system; 21. Sand pump; 22. Mixing funnel; 221. Funnel; 222. Funnel valve; 223. Three-way joint; 224. Nozzle; 225. Inlet reducer; 226. Flared outlet; 23. Remote control jib crane; 24. Rain shelter; 25. Bag breaker; 3. Slurry storage and stirring system; 31. Storage tank; 32. Agitator; 321. Base; 322. Direct drive motor; 323. Connecting flange; 324. Stirring shaft; 325. Lower impeller; 326. Upper impeller; 33. Liquid level detector; 4. Heavy slurry circulation system; 41. Plugging pump; 42. Pump group skid; 43. Permanent magnet synchronous direct drive motor; 5. Bottom plate. Detailed implementation manners

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] Embodiment 1

[0047] A self-controlled pressure type high-efficiency multi-functional skid-mounted tank for petroleum engineering, as Figure 1 and 2 shown, includes a bottom plate 5 and multiple systems. Specifically, a slurry preparation system 2 skid-mounted at the front section of the bottom plate 5 uses a sand pump 21 to prepare fluids in multiple drilling and completion operations and transports them into a storage tank 31; a slurry storage and mixing system 3 skid-mounted at the middle section of the bottom plate 5 is connected to the slurry preparation system 2 and uses a stirrer 32 to stir the fluids in the storage tank 31 after being prepared by the slurry preparation system 2; a heavy slurry circulation system 4 skid-mounted at the middle and rear sections of the bottom plate 5 is connected to the slurry storage and mixing system 3 and uses a plugging pump 41 to pump, squeeze, and hold pressure for plugging the fluids after being stirred by the slurry storage and mixing system 3; a control system 1 skid-mounted at the rear section of the bottom plate 5 is respectively connected to the slurry preparation system 2, the slurry storage and mixing system 3, and the heavy slurry circulation system 4 and controls their operations.

[0048] The above-mentioned fluids include plugging slurry, pipe sticking release fluid, gel, slug plugging fluid, sand lifting thick slurry, etc.

[0049] Embodiment 2

[0050] On the basis of Embodiment 1, this embodiment further elaborates on the slurry preparation system, as Figure 1 and 2 shown. The slurry preparation system includes a sand pump 21, a mixing funnel 22, a bag breaker 25, a remote control jib crane 23, and a rain shelter 24; the sand pump 21 is installed on the bottom plate 5 and is communicated with the outlet of the mixing funnel 22 through a pipeline, the bag breaker 25 is assembled on the mixing funnel 22, the rain shelter 24 is located above the inlet of the mixing funnel 22, and the remote control jib crane 23 is installed at the bottom of the rain shelter 24 and is used to transport raw materials above the mixing funnel (22).

[0051] In this embodiment, the function of the sand pump 21 is to transport corrosive drilling fluid with suspended particles or other liquid media under similar working conditions; the function of the mixing funnel 22 is to quickly and evenly mix the drilling fluid and additives; the function of the bag breaker 25 is to cut open the packaging bags of chemical products in bags near the opening of the mixing funnel 22; the function of the remote control cantilever crane 23 is to use a hand-held remote control to lift chemical products in bags at a low position or far away to the slurry preparation table; the function of the rain shelter 24 is, on the one hand, to fix the support of the cantilever crane track, and on the other hand, to shade and protect the operators on the slurry preparation table from rain (lowered for storage during transportation and lifted during work).

[0052] In this embodiment, after all the equipment process preparation work is completed, the slurry preparation process of the sand pump 21 is started: 1. Use the remote control cantilever crane 23 to lift the material bag (ton bag) on the ground to directly above the slurry mixing funnel 22; 2. Lower the hook to touch the rotating cutting blade of the bag breaker 25, and the chemical material particles or powder in the opened bag enter the bottom of the mixing funnel 22; 3. The high-speed flowing liquid at the bottom of the mixing funnel 22 forms a negative pressure jet through the pipeline nozzle to suck the chemical material particles or powder into the funnel, mix with the liquid, and then form a high-speed jet through the discharge pipe and enter the storage tank 31.

[0053] Electric butterfly valves are installed on both the inlet and outlet pipelines of the sand pump 21 and the self-priming pipeline of the plugging pump 41, and the electric butterfly valves are electrically connected to the control system 1.

[0054] In this embodiment, an electric butterfly valve is adopted for the first time, which has the comprehensive advantages of local manual operation, on-site panel operation, and operation in the remote control room. Technical parameters: AC220V ± 5% / 50Hz; input / output signal: 4 - 20mA; operation instruction panel opening display; working pressure of 1MPa.

[0055] The above-mentioned electric butterfly valves are installed on the inlet and outlet pipelines of the slurry preparation sand pump 21 and the self-priming pipeline of the plugging pump 41, and their functions are: when the on-site working conditions require changing the operation process, the corresponding electric butterfly valves can be switched on or off manually or by wireless remote control (its essential function is to switch the gate to change the liquid flow direction to determine whether to use the slurry preparation sand pump 21 for slurry preparation or the plugging pump 41 for slurry preparation).

[0056] In this embodiment, for the slurry preparation system 2, its main equipment includes an SB5×6 - 55kW sand pump, an HHQ / P 150×150 funnel, an electric bag breaker 25, a 2t remote control cantilever crane, etc. Technical parameters: processing capacity: 200m 3 / h; large bag lifting load: 2t.

[0057] Different from the conventional drilling fluid preparation, it mainly ensures the uniform preparation of large particles, high density, and high concentration by optimizing the pipeline process and adopting high-speed jet and special nozzles.

[0058] Specifically, for optimizing the pipeline process: The layout of the high- and low-pressure pipeline processes of the entire skid-mounted tank is beautiful, simple, and reasonable, facilitating operation and maintenance. The manifolds and valves are numbered according to their functions, and the operation is simple in combination with electric butterfly valves, achieving remote control while saving manpower. 1) Multiple low-pressure pipeline interfaces are reserved. By switching the electric butterfly valve, it is convenient to supplement mud into the tank and quickly supply liquid to the plugging pump 41 and the mud pump of the drilling team. 2) The overall equipment is equipped with 1 piece of 3″ * 4 m high-pressure hose, 1502 annular conversion high-pressure pipelines, and 3 types of high-pressure union joints such as 3″ + 2″, 4″, and 5″, which can be connected to the high-pressure manifolds of the mud pumps of the well team, the choke and kill manifolds, and the cementing pump trucks and other equipment according to the needs of the on-site working conditions.

[0059] Design of the low-pressure pipeline process: mainly by switching the gate valve, the inlet and outlet pipelines separately laid by the previous slurry mixing sand pump 21 are integrated with the suction pipeline of the plugging pump 41 into one, and they can be used complementarily and supply liquid in reverse. The reasonable layout of the high- and low-pressure pipelines and the reserved joints for connecting to various pipelines can be applied to the pipeline liquid transportation of oilfield and mine equipment.

[0060] For the use of high-speed jets and special nozzles, compared with ordinary jet funnels, the ZHP150X-1 type direct injection hybrid stainless steel funnel mainly optimizes the inlet pipeline so that the jet injection speed exceeds (45 m / s). To facilitate the passage of large particle solid content, a nozzle with an extended and enlarged diameter is used.

[0061] As Figure 3 shown, the mixing funnel 22 includes a funnel 221, a funnel valve 222, a tee 223, a nozzle 224, an inlet reducer 225, and a flared outlet 226;

[0062] The top inlet of the tee 223 is connected to the bottom outlet of the funnel 221, the left inlet is connected to the outlet of the nozzle 224, the right outlet is connected to the flared outlet 226, the funnel valve 222 is installed at the bottom outlet of the funnel 221, the outlet of the inlet reducer 225 is connected to the inlet of the nozzle 224, the inlet of the inlet reducer 225 is connected to the outlet of the sand pump 21 through a pipeline, and the flared outlet 226 is connected to the inside of the storage tank 31 through a pipeline.

[0063] In this embodiment, the sand pump 21 transports the liquid to the inlet reducer 225 and the nozzle 224, the liquid flow rate increases, and then it enters the tee 223; at the same time, the material in the funnel 221 enters the tee 223 through its outlet, mixes with the high-speed liquid in the tee 223, and the mixed material then enters the storage tank 31 through the flared outlet 226, thus achieving the purpose of slurry mixing.

[0064] Embodiment 3

[0065] Based on Embodiment 2, this embodiment further elaborates on the slurry storage and mixing system. AsFigure 1 and 2 As shown in 2 , the slurry storage and stirring system 3 includes a storage tank 31, a stirrer 32, and a liquid level detector 33. The storage tank 31 is horizontally placed in the middle of the bottom plate 5. There are several groups of stirrers 32 vertically inserted into the storage tank 31 to stir the materials in the storage tank 31, and the liquid level detector 33 is installed on the storage tank 31 and vertically inserted into the storage tank 31 to detect the liquid level of the materials in the storage tank 31.

[0066] As Figure 2 and Figure 4 shown in Figure 4 , the stirrer 32 includes a base 321, a direct drive motor 322, a connecting flange 323, a stirring shaft 324, and an impeller;

[0067] The base 321 is installed at the top of the storage tank 31. The direct drive motor 322 is installed on the base 321 and is frequency-controlled. The direct drive motor 322 is connected to the stirring shaft 324 through the connecting flange 323. The stirring shaft 324 is vertically arranged in the storage tank 31, and the impeller is installed on the stirring shaft 324;

[0068] The impeller includes a lower impeller 325 and an upper impeller 326. The lower impeller 325 is a three-blade propeller type blade, and a draft tube is installed around it; the upper impeller 326 is a four-blade open turbine type blade, and the upper impeller 326 has two different diameter sizes and is detachable and assembled.

[0069] In this embodiment, the stirrer 32 is composed of a base 321, a 18.5kW direct drive motor 322, a connecting flange 323, an impeller, a stirring shaft 324, etc. Technical parameters: Power: 18.5kW; Rotation speed: 0 - 100 rpm (working rotation speed); Impeller: Double impeller; Direct drive technology.

[0070] Principle of improving stirring efficiency:

[0071] Improved transmission efficiency: The stirrer 32 in this embodiment uses a direct drive motor 322 to directly drive the stainless steel stirring shaft 324 and impeller. The stainless steel components effectively extend the service life. Removing the worm and worm gear box in the traditional stirrer structure, the transmission efficiency will be increased by about 8%.

[0072] More sufficient stirring: The thickened stainless steel blade structure (i.e., the impeller) adopts a double-layer different structure. The lower layer is a three-blade propeller type blade (i.e., the lower impeller 325), and a stainless steel draft tube is installed around it. The upper layer adopts a four-blade open turbine type blade (i.e., the upper impeller 326); The upper layer blades are selected with two different diameter sizes and a detachable assembly method. The small diameter blades are selected when the liquid flow rate is greater, the rotation speed is higher, and the strong stirring condition occurs.

[0073] Reduced solid phase settlement: The double-layer blades with different structures completely change the circulation mode of the drilling fluid. The drilling fluid is sucked from the bottom of the draft tube. Under the propulsion generated by the rotation of the lower-layer blades, the drilling fluid is pushed upward and enters the rotation range of the upper-layer blades. Under the stirring action of the upper-layer blades, a good suspension state of the solid phase in the drilling fluid is maintained.

[0074] Adjustable rotation speed: The control part adopts AC variable frequency control. According to the performance of the on-site drilling fluid, the rotation speed can be adjusted within a certain range, and it can be applied to different types of drilling fluids.

[0075] Replaceable blades: To improve the stirring efficiency, according to the mud performance or construction needs, the upper and lower blades with different specifications and shapes can be replaced.

[0076] Reduced maintenance cost: The overall structure is simple and reliable, and the service life is greatly improved. The maintenance cycle is changed from changing the lubricating oil of the worm and gear box every 2-3 months to greasing the motor every 12 months.

[0077] Noise reduction and environmental protection: The motor speed is reduced from 1450 r / min to about 80 r / min, and the noise and vibration are reduced by more than 20%.

[0078] Example 4

[0079] On the basis of Example 3, this example further elaborates on the heavy mud circulation system, as Figure 1 and 2 shown, the heavy mud circulation system 4 includes a pump group skid 42, a permanent magnet synchronous direct drive motor 43, a plugging pump 41, a spray subsystem and a lubrication subsystem. The pump group skid 42 is installed on the bottom plate 5. The permanent magnet synchronous direct drive motor 43 and the plugging pump 41 are both installed on the pump group skid 42, and the permanent magnet synchronous direct drive motor 43 directly drives the plugging pump 41. The plugging pump 41 pumps, injects and holds pressure for plugging the fluid stirred by the slurry storage and mixing system. The spray subsystem is connected to the plugging pump 41 to wash and cool the plugging pump 41. The lubrication subsystem is connected to the plugging pump 41 to lubricate the plugging pump 41.

[0080] In this example, the "heavy mud" in the heavy mud circulation system 4 refers to high-density and high-concentration mud mixed with barite or other plugging agents. "Circulation" refers to the process of being sucked into the plugging pump 41 from the storage tank 31, pressurized and discharged, and pumped to the target pipeline and then into the lost formation.

[0081] In this embodiment, the permanent magnet synchronous direct drive motor 43 is used to drive the plugging pump 41 to work; the plugging pump 41 is used to pump and inject the prepared mud or other fluids to the target formation through the high-pressure pipeline in the circulation system; the spray subsystem consists of a spray pump, a water tank, a spray pipe, etc., and is used to wash and cool the cylinder liner and piston during the operation of the plugging pump 41; the lubrication subsystem consists of a gear oil pump, pipelines, nozzles, etc., and is used to fully lubricate the mechanical components of the power end of the plugging pump 41 that move and rotate, so as to ensure the normal operation of the equipment and the extension of its service life.

[0082] The plugging pump 41 is a 450HP plugging pump, which adopts a metal hollow spherical valve body structure, and the sealing surface of its pump valve body is a spherical line seal.

[0083] In this embodiment, the heavy mud circulation system mainly includes a 450HP plugging pump, a 355kW permanent magnet synchronous direct drive motor, a spray subsystem, a lubrication subsystem, a pump group skid 42, etc. It optimizes multiple parts such as the hydraulic end and the power end, and adopts the permanent magnet synchronous direct drive technology, making the overall structure of the pump compact, with reduced volume and weight. This pump can adapt to particles with a particle size of 2mm - 8mm and flaky chemical fibers with a size of 6mm - 12mm in the drilling fluid. The suction and discharge valves of the pump's hydraulic end are reliably sealed. It uses a Φ120mm cylinder liner piston, with a rated working pressure of 20MPa and a maximum displacement of 14.7L / S. The pump displacement can be determined by the pump strokes according to the working conditions. It can meet the requirements of pumping, injecting, and holding pressure for plugging during the construction processes of bridge mud, gel, pipe release agent, high-loss water plugging slurry, etc. Technical parameters: Type: Horizontal three-cylinder single-acting piston pump; Maximum input power: 355kW; Stroke: 200mm; Piston diameter: 120mm; Rated pressure: 20Mpa; Rated strokes: 130r / min; Suction port: 150mm (6"); Discharge port: 80mm (3").

[0084] How to realize the pumping of large particles, high-density and high-viscosity fluids into the well and achieve high-pressure pumping. In order to effectively solve the problem of large particle solid blockage of the sealing surface of the inlet and outlet valve bodies, the 450HP professional plugging pump adopts a new type of special metal hollow spherical valve body structure, changing the sealing surface of the pump valve body from the original inclined plane seal to a spherical line seal, thus realizing the high-pressure holding and the passing ability of pumping large particles.

[0085] Embodiment 5

[0086] This embodiment is further elaborated on the basis of Embodiment 4, such as Figure 1 、 Figure 2As shown in the figure, in this embodiment, the control system is arranged in the centralized control room, which is the center of the control system and realizes the remote control of the plugging pump 41, the slurry mixing system 2, the agitator 32, and the lighting, including one-key linkage control of process visualization, fault alarm, equipment operation status monitoring, monitoring, remote transmission of reserved signals, etc.; the centralized control room is equipped with a frequency converter, 1 display, a human-machine interface, 1 distribution box, 1 explosion-proof emergency LED lamp, a transformer, etc.

[0087] The control system takes the high-performance Siemens S7-1500 PLC as the control core. The control system adopts a single PLC + bypass control scheme to realize the electrical control logic of the frequency converter operation console. Through the fieldbus control technology, digital devices are composed of a Profinet network system to achieve high-speed communication between control systems such as frequency converters and leak repair device consoles. The automation level (PLC), digital drive level, and driller's operation console form a network system through Profinet, with two-way parameter transmission, reliable operation, and simple operation. The control system collects sensor signals such as pump strokes, pump pressures, lubricating oil pressures, and liquid levels, and displays them on the display screen on the operation console, and realizes the corresponding alarm protection functions.

[0088] The external power grid provides a 600VAC / 50Hz / 1250A (dual-system 400VAC / 50Hz / 1250A) alternating current to access the room. One 450HP plugging pump is directly driven by one 355KW permanent magnet synchronous direct drive motor to achieve stepless speed regulation and meet the full-load transmission requirements of the plugging pump 41. Two frequency conversion units are supporting, driving two 18.5KW permanent magnet synchronous direct drive motors to directly drive the new type of agitator. The driving performance meets the control requirements, realizes the stepless speed regulation function, and at the same time meets the requirements of emergency operation.

[0089] Embodiment 6

[0090] This embodiment is further elaborated on the basis of Embodiment 5, as Figure 1 , Figure 2 and Figure 5 shown, the sand pump 21 and the plugging pump 41 are skid-mounted on the bottom plate 5. A railing is provided at the top of the storage tank 31, and the railing adopts a folding structure. The remote control cantilever crane 23 adopts a telescopic structure; the internal substrate of the storage tank 31 adopts three inclined bottom plates connected in sequence. The middle inclined bottom plate inclines and contracts towards one end, and the joints between the inclined bottom plates and the joints between the inclined bottom plates and the wall plates of the storage tank 31 are all arc-shaped transitions.

[0091] In this embodiment, the sand pump 21 and the plugging pump 41 are designed as a skid on the tank module. The railing is designed with a folding structure, and the cantilever crane is designed with a telescopic structure. With the design concepts of stable overall structure, reliable function, and safe transportation, the bottom plate of the three-inclined-plane tank is designed for convenient sand cleaning. The connection between the wall panel and the inclined bottom plate has a circular arc transition to reduce the dead corners of the tank and the residual mud in the tank.

[0092] Embodiment 7

[0093] This embodiment is further elaborated on the basis of Embodiment 6. As Figure 2 shown, it further includes a lighting system connected to the control system. The lighting system includes 2 movable lamp-stand type lighting lamps and 2 fixed hanging type lighting lamps. The 2 movable lamp-stand type lighting lamps are arranged on the storage tank 31, and the 2 fixed hanging type lighting lamps are respectively arranged on the slurry mixing system 2 and the heavy slurry circulation system 4.

[0094] In this embodiment, the lighting system: includes 4 lighting lamps, a distribution box, cables, connectors, etc. Among them, 2 movable lamp-stand type lighting lamps are arranged on the tank surface, and 2 fixed hanging type lighting lamps are respectively arranged on the slurry mixing system 2 and the heavy slurry circulation system 4. The explosion-proof circuit is installed at both ends of the tank. All areas are supplied with power uniformly for lighting and power. Grounding system: 1 set of grounding systems for the tank body and equipment. The above design meets the special safety requirements of the oil drilling industry.

[0095] Embodiment 8

[0096] This embodiment is further elaborated on the basis of Embodiment 7. As Figure 6 and Figure 7 shown, the inlet pipe of the plugging pump 41 is connected into the storage tank 31, and a first electric butterfly valve 101 is arranged thereon. The outlet pipe of the plugging pump 41 is connected to the surface gate valve group or the drill floor gate valve group, and an electric gate valve 106 is arranged thereon;

[0097] The inlet pipe of the sand pump 21 is connected into the storage tank 31, and a second electric butterfly valve 102 is arranged thereon. The inlet pipe of the sand pump 21 is also connected with an external supplementary pipe, and a manual butterfly valve 107 is arranged on the external supplementary pipe;

[0098] The outlet pipe of the sand pump 21 is connected into the storage tank 31, and a fifth electric butterfly valve 105 and the mixing funnel 22 of the skid-mounted tank slurry mixing system 2 are arranged on the rear section thereof;

[0099] A fourth electric butterfly valve 104 is arranged on the front section of the outlet pipe of the sand pump 21, and a first pipeline connected to the inlet pipe of the plugging pump 41 is connected in front of the fourth electric butterfly valve 104, and a third electric butterfly valve 103 is arranged on the first pipeline;

[0100] The front section of the outlet pipe of the sand pump 21, behind the fourth electric butterfly valve 104, is also connected to a second pipeline that is connected to the outlet pipe of the plugging pump 41. A first ball valve 108 and a manual gate valve 109 are respectively arranged at both ends of the second pipeline. The second pipeline is also connected to a cleaning pipeline, which communicates with the inside of the storage tank 31 and is provided with a second ball valve 110 thereon, and a cleaning gun is connected to the end.

[0101] The control system 1 is connected to the first electric butterfly valve 101, the second electric butterfly valve 102, the third electric butterfly valve 103, the fourth electric butterfly valve 104, the fifth electric butterfly valve 105, and the electric gate valve 106. The control system 1 controls the opening and closing of the valves, and controls the operation of the sand pump 21, the plugging pump 41, and the agitator 32 to perform the sand pump 21 perfusion process, the plugging pump 41 self-priming process, the sand pump 21 mixing process, the plugging pump 41 mixing process, the sand pump 21 cleaning process, and the leak repair / injection process.

[0102] In this embodiment, by switching the electric butterfly valve and the high-pressure gate valve, there are six major technological processes respectively: 1. The sand pump 21 perfusion process; 2. The plugging pump 41 self-priming process; 3. The sand pump 21 mixing process; 4. The plugging pump 41 mixing process; 5. The sand pump 21 cleaning process; 6. The leak repair / injection process. The specific details of each technological process are as follows:

[0103] (1) The sand pump 21 perfusion process

[0104] In this embodiment, the sand pump 21 perfusion process is to pump the plugging slurry in the storage tank 31 to the plugging pump 41 through the sand pump 21 for high-pressure injection.

[0105] The sand pump 21 perfusion process includes: opening the second electric butterfly valve 102 and the third electric butterfly valve 103, closing other valves, and starting the sand pump 21; then opening the electric gate valve 106, and starting the plugging pump 41, the spray pump, and the lubricating pump. The mixed material in the storage tank 31 after being stirred by the agitator 32 is transported to the plugging pump 41 through the sand pump 21 for high-pressure injection; at the same time, through the control of the frequency converter, the speed of the motor of the plugging pump 41 is reduced, and the sand pump 21 supplies liquid while the plugging pump 41 injects into the well.

[0106] In this embodiment, for the heavy slurry circulation system 4 of the skid-mounted tank, it includes the plugging pump 41, the spray subsystem, and the lubrication subsystem. A spray pump and a lubricating pump are respectively arranged in the spray subsystem and the lubrication subsystem.

[0107] (2) The plugging pump 41 self-priming process

[0108] In this embodiment, the plugging pump 41 self-priming process is that the plugging pump 41 directly sucks the plugging slurry in the tank body during priming and pumps it into the well for operation.

[0109] The self-priming process of the plugging pump 41 includes: opening the first electric butterfly valve 101 and the electric gate valve 106, closing all other valves, and simultaneously starting the plugging pump 41, the spray pump, and the lubricating pump. The mixed material in the storage tank 31 after being stirred by the stirrer 32 is directly pumped into the well through the plugging pump 41. At the same time, through the control of the frequency converter, the motor speed of the plugging pump 41 is reduced to carry out the self-priming of the plugging pump 41 into the well.

[0110] (3) Mixing process of the sand pump 21

[0111] In this embodiment, the mixing process of the sand pump 21 is to supply liquid to the mixing funnel by the sand pump 21 for slurry preparation.

[0112] The mixing process of the sand pump 21 includes: opening the second electric butterfly valve 102, the fourth electric butterfly valve 104, and the fifth electric butterfly valve 105, closing all other valves, and simultaneously starting the sand pump 21. The liquid in the storage tank 31 is transported to the mixing funnel through the sand pump 21 to supply liquid to the mixing funnel 22 for slurry preparation, and the mixed material after slurry preparation is transported into the storage tank 31.

[0113] In the above mixing process, the bagged material is placed on the bag breaker 25 by the cantilever crane. After automatic bag breaking, the bulk material is fully mixed by the sand pump 21 and the mixing funnel 22. Through repeated mixing, the working fluid meets the usage requirements. At the same time, the plugging pump 41 can also supply liquid to the mixing funnel.

[0114] (4) Mixing process of the plugging pump 41

[0115] In this embodiment, the mixing process of the plugging pump 41 is to supply liquid to the mixing funnel by the plugging pump 41 to accelerate the slurry preparation speed.

[0116] The mixing process of the plugging pump 41 includes: opening the first electric butterfly valve 101, the manual gate valve 109, the first ball valve 108, and the fifth electric butterfly valve 105, closing all other valves, and simultaneously starting the plugging pump 41, the spray pump, and the lubricating pump. The liquid in the storage tank 31 is transported to the mixing funnel through the plugging pump 41 to supply liquid to the mixing funnel 22 for slurry preparation, and the mixed material after slurry preparation is transported into the storage tank 31.

[0117] (5) Cleaning process of the sand pump 21

[0118] In this embodiment, the cleaning process of the sand pump 21 is to pump the external clean water through the sand pump 21 to the plugging pump 41 to carry out the flushing and cleaning of the plugging slurry in the sand pump 21, the plugging pump 41, and the pipeline.

[0119] The cleaning process of the sand pump 21 includes: opening the manual butterfly valve 107, the third electric butterfly valve 103, the manual gate valve 109, and the second ball valve 110, and starting the sand pump 21 and the plugging pump 41. The sand pump 21 pumps clear water to the suction port of the plugging pump 41 to wash and clean the plugging slurry in the sand pump 21, the plugging pump 41, and the pipeline. Then the cleaning water is transported to the cleaning gun through the plugging pump 41, and the cleaning gun is used to clean the storage tank 31.

[0120] (6) Leak repair / injection process

[0121] In this embodiment, the leak repair / injection process is a dual measure to enable the plugging pump 41 to pump the plugging slurry in the storage tank 31 into the well for leak repair operations. When the amount of plugging slurry in the storage tank 31 is insufficient, the sand pump 21 can be used to pour external supplementary plugging slurry to the plugging pump 41, and then pump it into the well for leak repair construction operations.

[0122] The leak repair / injection process includes:

[0123] When the plugging pump 41 pumps the plugging slurry in the storage tank 31 into the well for leak repair operations: open the first electric butterfly valve 101 and the electric gate valve 106, close all other valves, and at the same time start the plugging pump 41, the spray pump, and the lubricating pump. The plugging pump 41 directly sucks the plugging slurry in the storage tank 31 and injects it at high pressure to the surface gate valve group or the drill floor gate valve group.

[0124] When the amount of plugging slurry in the storage tank 31 is insufficient and the sand pump 21 is used to pour external supplementary plugging slurry to the plugging pump 41 for operation: open the manual butterfly valve 107, the third electric butterfly valve 103, and the electric gate valve 106, close all other valves, and start the sand pump 21 and the plugging pump 41. The sand pump 21 pumps the external supplementary plugging slurry to the suction port of the plugging pump 41, and then the plugging pump 41 injects it at high pressure to the surface gate valve group or the drill floor gate valve group.

[0125] Embodiment 9

[0126] In this embodiment, the implementation method of preparing the working fluid is as follows: According to the on-site construction plan, first tow the skid-mounted tank to the required position on the well site with a trailer, then lift it to the ground with a crane, and then connect the 600V or 400V power supply according to the power supply system provided on site; Turn on the main power switch, check and detect that all electrical equipment is in normal condition, and then connect the high-pressure outlet pipeline of the same specification to the surface gate valve group or the drill floor gate valve group. Before preparing the working fluid, first put clean water or base slurry (generally drilling fluid) into the tank from the inlet on the tank surface or pump it into the tank through the mixing slurry pump by switching the gate valve; Then start the 18.5KW permanent magnet synchronous stirrer through the remote control panel, open the butterfly valve on the slurry mixing pipeline, then start the sand pump 21, open the feeding funnel, and commission the slurry mixing system. The personnel use the remote control to operate the remote control cantilever crane 23 to send the large bag of slurry mixing materials and agents to the upper part of the mixing funnel 22. The operator stands on the base 321 beside the mixing funnel 22 and adds the plugging agent along the funnel inlet; The flow rate and the injection speed at the mixing funnel 22 can be adjusted through the butterfly valve on the connecting pipeline of the sand pump 21 to ensure that the feeding effect of chemical materials such as large particle plugging agents is good without spraying and ensure that the plugging agent is evenly dispersed. After the plugging slurry is prepared, close the slurry mixing funnel, and then turn off the power supply of the sand pump 21 through the remote control panel; Stir evenly and then the construction can be carried out.

[0127] The method of pumping into the well or applying pressure: First, ensure that the high-pressure discharge pipeline of the 450HP plugging pump is reliably connected to the surface or drill floor gate valve group; Open the 3〞 high-pressure gate valve, remotely start the 450HP plugging pump according to the requirements of the construction parameters (pump pressure, displacement, volume of fluid entering the well, etc.), and adjust the construction parameters through the remote control panel of the portable tablet computer.

[0128] Safety protection device: In case of an accident, immediately start the safety protection device system. This set of equipment has two sets of safety protection systems. 1 Use the portable tablet computer to remotely operate to start or stop the construction operation; 2 An emergency stop button is installed in the electric control room. After the construction is completed, use the spare outlet pipeline (special tank cleaning outlet) to discharge the remaining plugging slurry or cleaning liquid to the designated sewage discharge location.

[0129] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-controlled pressure type high-efficiency multi-functional skid-mounted tank for petroleum engineering, characterized in that Including: Bottom plate (5); A slurry preparation system (2) skid-mounted at the front section of the bottom plate (5), which uses a sand pump (21) to prepare fluids in various drilling and completion operations and transports them into a storage tank (31); A slurry storage and agitation system (3) skid-mounted in the middle section of the bottom plate (5), which is connected to the slurry preparation system (2) and uses an agitator (32) to agitate the fluids in the storage tank (31) after being prepared by the slurry preparation system (2); A heavy slurry circulation system (4) skid-mounted in the middle and rear section of the bottom plate (5), which is connected to the slurry storage and agitation system (3) and uses a plugging pump (41) to pump, squeeze, and hold pressure for plugging of the fluids after being agitated by the slurry storage and agitation system (3); A control system (1) skid-mounted at the rear section of the bottom plate, which is respectively connected to the slurry preparation system (2), the slurry storage and agitation system (3), and the heavy slurry circulation system (4) and controls their operations.

2. The self-controlled pressure type high-efficiency multi-functional skid-mounted tank for petroleum engineering according to claim 1, characterized in that, The slurry preparation system (2) includes a sand pump (21), a mixing funnel (22), a bag breaker (25), a remote control jib crane (23), and a rain shelter (24); the sand pump (21) is installed on the bottom plate (5) and is connected to the outlet of the mixing funnel (22) through a pipeline, the bag breaker (25) is assembled on the mixing funnel (22), the rain shelter (24) is located above the inlet of the mixing funnel (22), and the remote control jib crane (23) is installed at the bottom of the rain shelter for transporting raw materials above the mixing funnel (22).

3. The self-controlled pressure type high-efficiency multi-functional skid-mounted tank for petroleum engineering according to claim 2, wherein, The mixing funnel (22) includes a funnel (221), a funnel valve (222), a tee (223), a nozzle (224), an inlet reducer (225), and a flared outlet (226); The top inlet of the tee (223) is connected to the bottom outlet of the funnel (221), the left inlet is connected to the outlet of the nozzle (224), the right outlet is connected to the flared outlet (226), the funnel valve (222) is installed at the bottom outlet of the funnel (221), the outlet of the inlet reducer (225) is connected to the inlet of the nozzle (224), the inlet of the inlet reducer (225) is connected to the outlet of the sand pump (21) through a pipeline, and the flared outlet (226) is connected to the inside of the storage tank (31) through a pipeline.

4. The self-controlled pressure type high-efficiency multi-functional skid-mounted tank for petroleum engineering according to claim 1, wherein, The slurry storage and agitation system (3) includes a storage tank (31), an agitator (32), and a liquid level detector (33). The storage tank (31) is horizontally placed in the middle of the bottom plate (5). Several groups of agitators (32) are vertically inserted into the storage tank (31) to agitate the materials in the storage tank (31), and the liquid level detector (33) is installed on the storage tank (31) and vertically inserted into the storage tank (31) to detect the liquid level of the materials in the storage tank (31).

5. The self-controlled pressure type high-efficiency multi-functional skid-mounted tank for petroleum engineering according to claim 4, characterized in that, The agitator (32) includes a base (321), a direct drive motor (322), a connecting flange (323), a stirring shaft (324), and an impeller; The base (321) is installed at the top of the storage tank (31). The direct drive motor (322) is installed on the base (5) and is frequency-controlled. The direct drive motor (322) is connected to the stirring shaft (324) through a connecting flange (323). The stirring shaft (324) is vertically arranged in the storage tank (31), and the impeller is installed on the stirring shaft (324). The impeller includes a lower impeller (325) and an upper impeller (326). The lower impeller (325) is a three-blade propeller type blade, and a draft tube is installed around it. The upper impeller (326) is a four-blade open turbine type blade, and the upper impeller (326) has two different diameter sizes and is detachably assembled.

6. The self-controlled pressure type high-efficiency multi-functional skid-mounted tank for petroleum engineering according to claim 1, wherein The heavy slurry circulation system (4) includes a pump unit skid (42), a permanent magnet synchronous direct drive motor (43), a plugging pump (41), a spray subsystem and a lubrication subsystem. The pump unit skid (42) is installed on the floor plate (5). The permanent magnet synchronous direct drive motor (43) and the plugging pump (41) are both installed on the pump unit skid (42), and the permanent magnet synchronous direct drive motor (43) directly drives the plugging pump (41). The plugging pump (41) pumps, injects and holds pressure for plugging the fluid stirred by the slurry storage and mixing system (3). The spray subsystem is connected to the plugging pump (41) to wash and cool the plugging pump (41). The lubrication subsystem is connected to the plugging pump (41) to lubricate the plugging pump (41).

7. An automatic pressure control type high-efficiency and multi-functional skid-mounted tank for petroleum engineering according to claim 1 or 6, characterized in that The plugging pump (41) is a 450HP plugging pump, which adopts a metal hollow spherical valve body structure, and the sealing surface of its pump valve body is a spherical line seal.

8. The self-controlled pressure type high-efficiency multi-functional skid-mounted tank for petroleum engineering according to claim 2, characterized in that, The sand pump (21) and the plugging pump (41) are skidded and arranged on the floor plate (5). A railing is provided at the top of the storage tank (31), and the railing adopts a folding structure. The remote control jib crane (23) adopts a telescopic structure. The internal substrate of the storage tank (31) adopts three inclined bottom plates connected in sequence. The middle inclined bottom plate inclines and contracts towards one end. The joints between the inclined bottom plates and the joints between the inclined bottom plates and the storage tank wall panels are all arc-transitioned. It also includes a lighting system connected to the control system (1). The lighting system includes 2 movable lamp rack type lighting lamps and 2 fixed hanging type lighting lamps. The 2 movable lamp rack type lighting lamps are arranged on the storage tank (31), and the 2 fixed hanging type lighting lamps are respectively arranged on the slurry mixing system (2) and the heavy slurry circulation system (4).

9. The self-controlled pressure type high-efficiency multi-functional skid-mounted tank for petroleum engineering according to claim 1, characterized in that The inlet pipe of the plugging pump (41) is connected into the storage tank (31), and a first electric butterfly valve (101) is provided on it. The outlet pipe of the plugging pump (41) is connected to the surface gate valve group or the drill floor gate valve group, and an electric gate valve (106) is provided on it. The inlet pipe of the sand pump (21) is connected into the storage tank (31), and a second electric butterfly valve (102) is provided on it. The inlet pipe of the sand pump (21) is also connected with an external supplement pipe, and a manual butterfly valve (107) is provided on the external supplement pipe. The outlet pipe of the sand pump (21) is connected into the storage tank (31), and a fifth electric butterfly valve (105) and a mixing hopper (22) of the skid-mounted tank slurry mixing system (2) are provided on the rear section thereof; A fourth electric butterfly valve (104) is provided on the front section of the outlet pipe of the sand pump (21), and a first pipeline connected to the inlet pipe of the plugging pump (41) is connected in front of the fourth electric butterfly valve (104), and a third electric butterfly valve (103) is provided on the first pipeline; A second pipeline connected to the outlet pipe of the plugging pump (41) is further connected to the rear of the fourth electric butterfly valve (104) on the front section of the outlet pipe of the sand pump (21). A first ball valve (108) and a manual gate valve (109) are respectively provided at both ends of the second pipeline. The second pipeline is further connected with a cleaning pipeline which communicates into the storage tank (31) and a second ball valve (110) is provided thereon, and a cleaning gun is connected to the end; 10. The self-controlled pressure type high-efficiency multi-functional skid-mounted tank for petroleum engineering according to claim 9, characterized in that, The control system (1) is connected to the first electric butterfly valve (101), the second electric butterfly valve (102), the third electric butterfly valve (103), the fourth electric butterfly valve (104), the fifth electric butterfly valve (105) and the electric gate valve (106).

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