A drilling mud tank dewatering system and method of dewatering a drilling mud tank

Abstract

The present application provides a kind of drilling mud tank dredging system and drilling mud tank dredging method.Hose pump positive rotation suction liquid phase storage tank A storehouse in clean water and pump into dredging broken head form high pressure water jet, directly hydraulic crushing mud tank bottom silt body, high pressure water jet drive dredging broken head mechanical cutting crushing mud tank bottom silt body, silt body is broken and mixed after stirring with clean water form pumpable solid-liquid mixture, hose pump reverse will solid-liquid mixture discharge to liquid phase storage tank B storehouse, again after high-speed centrifuge carries out centrifugal dewatering dry processing, after processing clean water returns to liquid phase storage tank A storehouse, after dewatering dry separation out solid phase is discharged into solid phase collection tank.The present application can complete drilling mud tank silt body crushing, transport and dewatering dry, solve the drilling mud tank bottom manual dredging workload, operation space is limited and silt discharge is not environmental protection problem, improve the efficiency of cleaning tank, simple structure, easy operation, high degree of automation.

Description

TECHNICAL FIELD

[0001] The present application relates to drilling engineering technology and equipment field, and particularly to a drilling mud tank desilting system and a drilling mud tank desilting method. BACKGROUND

[0002] The mud tank is one of the necessary equipment for drilling, mainly for storing and transporting mud. In the process of oil drilling, the solid-liquid mixture containing cuttings returned from the bottom of the well is treated by purification equipment, and most of the cuttings are removed, but a small part of the cuttings still remain and deposit in the mud tank to form a relatively hard sludge body. With the extension of drilling time, the sludge body in the tank becomes larger and larger, and more and more solidified, which affects the tank volume and the mud performance, and occupies about one third or even half of the capacity of the mud tank, resulting in a decrease in the capacity of the mud tank, instability of the mud performance, and an increase in the weight of the mud tank.

[0003] Therefore, the tank must be cleaned before the well is completed and the equipment is moved, and even 1-2 times of cleaning is added during the process of drilling a well. The commonly used method is that workers enter the mud tank from the top of the mud tank, use a shovel and other tools to break and dig out the deposited sludge body, and then use the shovel to shovel it out to the ground or mud pool through the sand discharge door. Especially with the extension of drilling time or during the mud tank pouring process and long-term standing, the heavy phase and cuttings in the mud will appear serious sedimentation phenomenon, and the thickness of the deposited sludge body becomes larger and larger, which makes the sand discharge door of the mud tank unable to be opened, and the workers can only manually lift the tank to the tank surface for pouring.

[0004] Generally, a well team has 4-5 mud tanks of 50m³, and 5-6 workers are needed for one-time manual tank cleaning operation, and the tank cleaning time is about 24-48 hours. The time for cleaning the sludge body that is difficult to clean is even longer. During the tank cleaning, the workers are surrounded by the smell of irritating mud chemicals, and in some areas, the stratum also contains toxic and harmful hydrogen sulfide which enters the mud tank with the drilling fluid, which is very harmful to human health. Workers must wear gas masks to work, and workers cannot work in the tank for a long time, but work in the tank in shifts. The tank cleaning time is long, the work is heavy, the labor intensity is large, the efficiency is low, and the workers' health and the well team's moving work are affected.

[0005] For the sludge body deposited in the mud tank that is not too hard, a high-pressure water gun is also used to flush the deposited sludge body in the mud tank to dilute and scatter it, and then discharge it to the mud pool through the tank bottom sand discharge door. With the improvement of environmental protection requirements for oil field drilling, the mud pool with certain environmental pollution risk is no longer retained in the whole process of drilling and completion, and the method of flushing the sludge body in the mud tank with a high-pressure water gun cannot be implemented.

[0006] Therefore, the current drilling mud tank dredging and discharging method is seriously inconsistent with the health, safety and environmental protection requirements, and it is an inevitable trend to replace manual tank cleaning, improve mud tank and environmentally treat the accumulated body.

[0007] The technical solution disclosed in the invention name "air pressure cleaning device for mud tank sediment" (authorized publication number "CN 207271739U) is to use corresponding pipe fittings to suck the sediment in the tank and discharge it into the storage tank for further treatment, including air source, storage tank and vacuum pump. The device has simple structure, but the treatment effect on the hardened sediment is not good.

[0008] The technical solution disclosed in the invention name "mud tank cleaning device" (authorized publication number "CN 204553866 U") is to develop a reliable sealing valve to solve the problem that the sealing effect of the sand cleaning door or butterfly valve is not good during the discharge of waste liquid, which is easy to leak and splash. However, the device is suitable for direct discharge into the mud pool, and cannot be used for the current mud non-falling construction and the site without mud pool.

[0009] The technical solution disclosed in the invention name "automatic sludge cleaning mud tank" (authorized publication number "CN 206529391 U") is to use a mud tank body and a power device, a sludge lifting device, a sludge discharging device and a flushing device arranged in the mud tank body. The sludge lifting device includes a linear guide rail and a sludge lifting shell, and the sludge lifting shell is installed on the linear guide rail. A rotating impeller is installed in the sludge lifting shell to clean the sludge at the bottom of the mud tank body in one cycle and discharge it in time. The device can stir the mud in the mud tank body and reduce the sludge accumulation phenomenon. The technology is suitable for installation and modification of new tanks, and is only suitable for the initial stage of sludge accumulation without hardening, and has poor applicability. SUMMARY

[0010] The purpose of the present application is to solve the above-mentioned problems of drilling mud tank bottom dredging, provide a drilling mud tank dredging system and method, avoid the risk of manual tank cleaning in a closed space, use high-pressure water jet and mechanical method to break and crush the accumulated body, remove the sediment in the mud tank, and dehydrate and dry the sediment. The treated clear liquid is recycled, the labor intensity and operation time of tank cleaning personnel are reduced, and the construction safety is improved.

[0011] To solve the above-mentioned problems, the technical solution of the present application is:

[0012] A drilling mud tank dredging system, comprising a mixer A, a mud tank, a pipeline A, a liquid storage tank, a pipeline B, a valve A, a pipeline C, a valve B, a hose pump, a mixer B, a slurry pump, a high-speed centrifuge, a solid phase collection tank and a pipeline D, and a dredging and crushing head; wherein:

[0013] A stirring device is installed on the mud tank, and a hose pump, a stirring device B, a slurry pump, a high-speed centrifuge, and a hose pump control cabinet are installed on the tank surface of the liquid storage tank.

[0014] The liquid storage tank is divided into two non-communicating A and B warehouses, the A warehouse stores clean water or clear liquid, and the B warehouse collects and stores the slurry tank silt broken and mixed with clean water to form a pumpable solid-liquid mixture; the tank surface of the liquid storage tank is provided with a pipeline B, a valve A, a pipeline C, a valve B, a hose pump, a stirring device B, a slurry pump, a high-speed centrifuge, a hose pump control cabinet, and a pipeline D, and the solid phase collection tank is used for temporarily storing the solid phase separated by the high-speed centrifuge.

[0015] One end of the pipeline A is connected to the upper pipeline interface of the hose pump, and the other end is connected to the dredging and crushing head; one end of the pipeline B is connected to the lower pipeline interface of the hose pump, and the other end is deep into the bottom of the A warehouse of the liquid storage tank, and a valve is installed on the pipeline B; one end of the pipeline C is connected to the pipeline B at the lower pipeline interface of the hose pump, and a valve is installed thereon, and the other end is deep into the bottom of the B warehouse of the liquid storage tank; one end of the pipeline D is connected to the liquid outlet of the high-speed centrifuge, and the other end is connected to the A warehouse of the liquid storage tank.

[0016] The dredging and crushing head comprises a shell and a reamer disc; the hose pump control cabinet controls the start, forward rotation, reverse rotation and stop of the hose pump.

[0017] The above scheme further comprises:

[0018] The shell connecting end of the dredging and crushing head is provided with a liquid inlet, the front end surface of the shell is provided with a plurality of axial straight nozzles distributed in a circumferential direction, the outer periphery of the shell corresponding to the axial straight nozzles is provided with radial inclined nozzles and shaft seats, and the axial straight nozzles and the radial inclined nozzles are communicated with the liquid inlet through flow channels; the reamer disc corresponds to the shaft seat, each reamer disc is installed in the shaft seat of the shell through a reamer shaft and a shaft seat assembly, the reamer disc is provided with cutting blades, a plurality of rotor blades are arranged in a circumferential direction at equal intervals on the reamer shaft, and the position of the blade corresponds to the radial inclined nozzle.

[0019] The shell is a hollow structure, the inside of the shell is provided with a valve core, the valve core is provided with a radial hole and an axial hole, the inside of the shell is provided with a valve seat, a central cavity, a radial hole and a flow channel, the liquid inlet is sequentially communicated with the axial hole, the radial hole, the central cavity, the radial hole, the flow channel, the axial straight nozzle and the radial inclined nozzle, and the front end surface of the valve core is in dynamic sealing cooperation with the valve seat.

[0020] The shaft seat assembly comprises: the shaft is supported in the shaft seat of the shell through back-to-back double bearings, and is fixed on the shaft seat of the shell through a connecting bolt A, a throttling ring-shaped sealing cover A, a skeleton oil seal A, a spacer ring, a skeleton oil seal B, an oil seal box, an O-shaped rubber sealing ring, a shaft sleeve, a throttling ring-shaped sealing cover B, an end cover and a connecting bolt B; the reamer shaft on each group of reamer discs is connected to the shaft.

[0021] The sealing of the back-to-back double bearing adopts a bidirectional sealing structure combining mechanical dynamic sealing and static sealing, and the lubricant is injected into and lubricates the back-to-back double bearing through a straight-through type oil injection cup.

[0022] The number of the reamer discs is three, and the three groups of reamer discs are annularly and equidistantly arranged on the outer periphery of the shell.

[0023] The reamer shaft is provided with a rotor blade arranged annularly and equidistantly in the axial direction.

[0024] The spring is arranged to press the valve core against the valve core and valve seat contact surface in the shell.

[0025] The outer periphery of the reamer disc is provided with a protective cover.

[0026] The drilling mud tank desilting method based on the drilling mud tank desilting system has the following steps:

[0027] In the first step, the valve on pipeline B is opened, the valve on pipeline C is closed, the hose pump control cabinet is controlled to make the hose pump rotate forward, clean water in the A bin of the liquid storage tank is sucked through pipeline B, under the pump pressure of the hose pump, the clean water is pumped into the desilting and crushing head through pipeline A to form a high-pressure water jet, part of the high-pressure water jet directly hydraulically crushes the sludge tank bottom accumulation body, and the other part of the high-pressure water jet drives the upper blade of the desilting and crushing head to rotate as power to mechanically cut and crush the sludge tank bottom accumulation body; the desilting and crushing head and pipeline A are dragged to comprehensively crush all the accumulation bodies in the sludge tank.

[0028] In the second step, the hose pump control cabinet is controlled to stop the hose pump, the agitator A is started to work, and the crushed sludge deposits and clean water are mixed to form a pumpable solid-liquid mixture;

[0029] In the third step, the valve on pipeline B is closed, the valve on pipeline C is opened, the hose pump control cabinet is controlled to make the hose pump reverse, the solid-liquid mixture in the sludge tank is sucked into the hose pump through the desilting and crushing head and pipeline A, and then is discharged into the B bin of the liquid storage tank through pipeline C;

[0030] In the fourth step, the agitator B, the high-speed centrifuge and the slurry pump are started to work in sequence, the solid-liquid mixture in the B bin is pumped into the high-speed centrifuge to be dewatered and separated, the solid phase separated by dewatering is discharged into the solid phase collection tank, and the clean water after dewatering is returned to the A bin of the liquid storage tank through pipeline D for recycling in the next desilting cycle.

[0031] Compared with the prior art, the present application has the following advantages: (1) the drilling mud tank can be dredged and the sludge can be treated in an environmentally friendly manner, the risk of manual tank cleaning in a closed space is solved, the tank cleaning efficiency is improved, and the health, safety and environmental protection requirements are met; (2) the use cost is low, and the drilling cost is significantly saved; and (3) the structure is simple, the operation is convenient, and the degree of automation is high. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of a dredging and crushing head of the present application.

[0033] Figure 2 It is a schematic diagram of the overall structure of a dredging and crushing head of the present application. Figure 1 It is a sectional view along the line A-A.

[0034] Figure 3 It is a schematic diagram of the overall structure of a dredging and crushing head of the present application. Figure 1 It is an enlarged schematic diagram of a reamer shaft bearing assembly.

[0035] Figure 4 It is a schematic diagram of the overall structure of a drilling mud tank dredging system of the present application.

[0036] REFERENCE SIGNS:

[0037] 1, reamer disc; 2, rotor blade; 3, reamer shaft; 4, connecting bolt A; 5, throttling ring-shaped sealing cover A; 6, skeleton oil seal A; 7, spacer ring; 8, skeleton oil seal B; 9, oil seal box; 10, back-to-back double bearing; 11, straight-through type pressure injection oil cup; 12, O-shaped rubber sealing ring; 13, shaft sleeve; 14, throttling ring-shaped sealing cover B; 15, end cover; 16, connecting bolt B; 17, shaft; 18, bolt plug; 19, valve core; 20, spring; 21, elastic baffle ring for hole; 22, spring cover plate; 23, shell; 24, liquid inlet; 25, radial hole on valve core; 26, axial hole on valve core; 27, central cavity diameter of shell; 28, radial hole of shell; 29, internal axial flow passage of shell; 30, axial straight nozzle; 31, radial inclined nozzle; 32, contact surface of valve core and valve seat; 33, outlet; 34, liquid phase storage tank; 35, pipeline B; 36, valve A; 37, pipeline C; 38, valve B; 39, hose pump; 40, agitator B; 41, slurry pump; 42, high-speed centrifuge; 43, solid phase collection tank; 44, hose pump control cabinet; 45, pipeline D; 46, dredging and crushing head; 47, A bin; 48, B bin; 49, pipeline A; 50, mud tank; 51, agitator A. DETAILED DESCRIPTION

[0038] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0039] Example 4

[0040] Referring to the drawings Figure 1A drilling mud tank desilting system, comprising a mixer A51, a mud tank 50, a pipeline A49, a liquid phase storage tank 34, a pipeline B35, a valve A36, a pipeline C37, a valve B38, a hose pump 39, a mixer B40, a slurry pump 41, a high-speed centrifuge 42, a solid phase collection tank 43, a pipeline D45, and a desilting crushing head 46; wherein:

[0041] The mixer A51 is installed on the mud tank 2, and the hose pump 39, the mixer B40, the slurry pump 41, the high-speed centrifuge 42, and the hose pump control cabinet 44 are installed on the tank surface of the liquid phase storage tank 34.

[0042] The liquid phase storage tank 34 is divided into two non-communicating A compartments 47 and B compartments 48, the A compartments 47 store clean water or clear liquid, and the B compartments 48 collect and store the solid-liquid mixture formed after the desilting and crushing of the sludge in the mud tank and the mixing with clean water; the tank surface of the liquid phase storage tank 34 is provided with the pipeline B35, the valve A36, the pipeline C37, the valve B38, the hose pump 39, the mixer B40, the slurry pump 41, the high-speed centrifuge 42, the hose pump control cabinet 44, and the pipeline D45, and the solid phase collection tank 43 is used for temporarily storing the solid phase separated by the high-speed centrifuge 42.

[0043] One end of the pipeline A49 is connected to the upper pipeline interface of the hose pump 39, and the other end is connected to the desilting crushing head 46; one end of the pipeline B35 is connected to the lower pipeline interface of the hose pump 39, and the other end is deep into the bottom of the A compartment 47 of the liquid phase storage tank 34, and the valve 36 is installed on the pipeline B35; one end of the pipeline C37 is connected to the pipeline B35 at the lower pipeline interface of the hose pump 39, and the other end is deep into the bottom of the B compartment 48 of the liquid phase storage tank 34; one end of the pipeline D45 is connected to the liquid outlet of the high-speed centrifuge 42, and the other end is connected to the A compartment 47 of the liquid phase storage tank 34.

[0044] The desilting crushing head 46 comprises a shell 23 and a reamer disc 1; the hose pump control cabinet 44 controls the start, forward rotation, reverse rotation, and stop of the hose pump 39.

[0045] Embodiment 2

[0046] Referring to the drawings Figures 1-3 A desilting crushing head of a drilling mud tank desilting system, a shell 23 is provided with a liquid inlet 24 at the connection end, a plurality of axial straight nozzles 30 are distributed in a circumferential direction on the front end surface of the shell 23, a radial inclined nozzle 31 and a shaft seat are arranged on the outer periphery of the shell 23 corresponding to the axial straight nozzles 30, the axial straight nozzles 30 and the radial inclined nozzle 31 are communicated with the liquid inlet 24 through a flow channel 29; the reamer disc 1 corresponds to the shaft seat, each reamer disc 1 is installed in the shaft seat of the shell 23 through a reamer shaft 3 and a shaft seat assembly, the reamer disc 1 is provided with a cutting blade, a plurality of rotor blades 2 are arranged in a circumferential direction at equal intervals on the reamer shaft 3, and the position of the blade 2 is opposite to the radial inclined nozzle 31.

[0047] The shell 23 is a hollow structure, the inside of which is provided with a valve core 19, the valve core 19 is provided with a radial hole 25 and an axial hole 26, the inside of the shell 23 is provided with a valve seat, a central cavity 27, a radial hole 28 and a flow channel 29, the liquid inlet 24 sequentially communicates the axial hole 26, the radial hole 25, the central cavity 27, the radial hole 28, the flow channel 29, an axial straight nozzle 30 and a radial inclined nozzle 31, and the front end surface of the valve core 19 and the valve seat form a dynamic sealing cooperation.

[0048] The shaft seat assembly comprises: the shaft 17 is supported in the shaft seat of the shell 23 through the back-to-back double bearing 10, and is fixed on the shaft seat of the outer periphery of the shell 23 through the connecting bolt A4, the throttling ring-shaped sealing cover A5, the skeleton oil seal A6, the spacer ring 7, the skeleton oil seal B8, the oil seal box 9, the O-shaped rubber sealing ring 12, the shaft sleeve 13, the throttling ring-shaped sealing cover B14, the end cover 15 and the connecting bolt B16; the reamer shaft 3 on each group of the reamer disc 1 is connected to the shaft 17.

[0049] The sealing of the back-to-back double bearing 10 adopts a bidirectional sealing structure combined with mechanical dynamic sealing and static sealing, and the lubricant is injected and lubricated into the back-to-back double bearing 10 through the straight-through type pressure injection oil cup 11.

[0050] The number of the reamer disc 1 is three groups, and the three groups of the reamer disc 1 are annularly and equidistantly installed on the outer periphery of the shell 23, and each group of the reamer disc 1 is provided with three uniformly arranged cutting blades.

[0051] The reamer shaft 3 is provided with 5-8 rotor blades 2 which are annularly and equidistantly arranged in the axial direction.

[0052] The spring 20 is further included, and the spring 20 presses the valve core 19 on the valve core and valve seat contact surface 32 in the shell 23.

[0053] The outer periphery of the reamer disc 1 is provided with a protective cover.

[0054] Embodiment 3

[0055] Based on the drilling mud tank desilting system, the drilling mud tank desilting method comprises the following steps:

[0056] In the first step, the valve 36 on the pipeline B 35 is opened, and the valve 38 on the pipeline C 37 is closed; the hose pump control cabinet 44 is controlled to make the hose pump 39 rotate in the positive direction, the clean water in the A bin 47 of the liquid phase storage tank 34 is sucked through the pipeline B 35, under the pump pressure of the hose pump 39, the clean water is pumped into the desilting crushing head 46 through the pipeline A 33 to form a high-pressure water jet; part of the high-pressure water jet directly hydraulically crushes the bottom accumulated body of the mud tank 32, and the other part of the high-pressure water jet drives the blades on the desilting crushing head 46 to rotate as power, mechanically cuts and crushes the bottom accumulated body of the mud tank; the desilting crushing head 46 and the pipeline A 33 are dragged to comprehensively crush all the accumulated bodies in the mud tank 32;

[0057] Second step, operate the hose pump control cabinet 44 to stop the hose pump 39, and start the agitator A 31 to mix the broken sludge deposit with water to form a pumpable solid-liquid mixture;

[0058] Third step, close the valve 36 on the pipeline B 35, open the valve 38 on the pipeline C 37, and operate the hose pump control cabinet 44 to reverse the hose pump 39 to suck the solid-liquid mixture in the slurry tank 32 through the dredging breaking head 46, the pipeline A 33, and then discharge it to the B bin 48 of the liquid storage tank 34 through the pipeline C 37.

[0059] Fourth step, start the agitator B 40, the high-speed centrifuge 42, and the slurry pump 41 in sequence to pump the solid-liquid mixture in the B bin 48 into the high-speed centrifuge 42 for dehydration and separation, discharge the solid phase separated by dehydration into the solid phase collection tank 43, and return the water after dehydration and separation to the A bin 47 of the liquid storage tank 34 through the pipeline D 45 for use in the next dredging cycle.

[0060] Typical embodiment 4

[0061] Refer to the attached drawings Figure 1 A dredging system for a drilling slurry tank, comprising an agitator A 51, a slurry tank 50, a pipeline A 49, a liquid storage tank 34, a pipeline B 35, a valve A 36, a pipeline C 37, a valve B 38, a hose pump 39, an agitator B 40, a slurry pump 41, a high-speed centrifuge 42, a solid phase collection tank 43, a hose pump control cabinet 44, a pipeline D 45, and a dredging breaking head 46.

[0062] The agitator A 51 is installed on the slurry tank 50, and the hose pump 39, the agitator B 40, the slurry pump 41, the high-speed centrifuge 42, and the hose pump control cabinet 44 are installed on the tank surface of the liquid storage tank 34.

[0063] The liquid storage tank 34 is divided into two non-communicating A bin 47 and B bin 48, the A bin 47 stores clean water or liquid, and the B bin 48 collects and stores the pumpable solid-liquid mixture formed by mixing the broken slurry tank deposit with water; the tank surface of the liquid storage tank 4 is provided with the pipeline B 35, the valve A 36, the pipeline C 37, the valve B 38, the hose pump 39, the agitator B 40, the slurry pump 41, the high-speed centrifuge 42, the hose pump control cabinet 44, and the pipeline D 45, and the solid phase collection tank 43 is used for temporarily storing the solid phase separated by the high-speed centrifuge 42.

[0064] Pipeline A49 one end of the hose pump 39 upper pipeline interface, one end of the dredging head 46; pipeline B35 one end of the hose pump 39 lower pipeline interface, one end of the liquid storage tank 34 A warehouse 47 bottom of the A, pipeline B35 on the installation of valve 36; pipeline C37 one end of the hose pump 39 lower pipeline interface on the pipeline B35 and install the valve 38, the other end of the liquid storage tank 34 B warehouse 48 bottom; pipeline D45 one end of the high-speed centrifuge 42 liquid outlet, the other end of the liquid storage tank 34 A warehouse 47 into.

[0065] Dredging head 46 front end of the blade and reamer disc, under the action of high pressure water jet, drive blade rotation to drive the dredging head 46 reamer disc rotation cut, the bottom of the slurry tank 50 accumulation; hose pump control cabinet 44 control hose pump 39 start, forward rotation, reverse, stop.

[0066] The working principle of the application is: start the hose pump control cabinet 44, so that the hose pump 39 forward rotation suction liquid storage tank 34 A warehouse 47 in the clean water and pump into the dredging head 46 form high pressure water jet, a part of the high pressure water jet directly hydraulic crushing slurry tank 50 bottom of the accumulation, another part of the high pressure water jet as power drive dredging head 46 mechanical cutting and crushing slurry tank 50 bottom of the accumulation, after the accumulation of broken and clean water mixing after forming a pumpable solid-liquid mixture. Switching hose pump control cabinet 44 on the switch so that the hose pump 39 reverse, and the solid-liquid mixture is discharged to the liquid storage tank 34 B warehouse, and then through the high-speed centrifuge 42 centrifugal dewatering drying treatment. The treated clean water returns to the liquid storage tank 34 A warehouse, after dewatering drying separation of the solid phase into the solid phase collection tank 43.

[0067] A kind of drilling mud tank dredging method based on drilling mud tank dredging system, steps are:

[0068] First, open the valve A36 on pipeline B35, close the valve B38 on pipeline C37; control hose pump control cabinet 44 to make the hose pump 39 forward rotation, suction clean water in the liquid storage tank 34 A warehouse 47 in pipeline B35, under the pump pressure of hose pump 39, clean water is pumped into the dredging head 46 through pipeline A49 to form high pressure water jet; a part of the high pressure water jet directly hydraulic crushing slurry tank 50 bottom of the accumulation, another part of the high pressure water jet as power drive dredging head 46 blade rotation, mechanical cutting and crushing slurry tank bottom accumulation; drag dredging head 46 and pipeline A49, all the accumulation in the slurry tank 50 is broken;

[0069] Second, control hose pump control cabinet 44 to make the hose pump 39 stop working, start the stirrer A51 work, the broken slurry sediment and clean water are mixed to form a pumpable solid-liquid mixture;

[0070] Third step, close the valve A36 on the pipeline B35, open the valve B38 on the pipeline C37, control the hose pump control cabinet 44 to reverse the hose pump 39, the solid-liquid mixture in the mud tank 50 is sucked into the hose pump 39 through the dredging crushing head 46, the pipeline A49, and then discharged into the B bin 48 of the liquid phase storage tank 34 through the pipeline C37;

[0071] Fourth step, start the stirrer B40, high-speed centrifuge 42 and slurry pump 41 in turn, and pump the solid-liquid mixture in the B bin 48 into the high-speed centrifuge 42 for dehydration and separation, the solid phase separated by dehydration and separation is discharged into the solid phase collection tank 43, and the clean water after dehydration and separation returns to the A bin 47 of the liquid phase storage tank 34 through the pipeline D45, as the next dredging cycle.

[0072] The advantages of the present application are: the drilling mud tank accumulation body can be automatically broken, transported and dehydrated, the present application adopts high-pressure fluid as power to simultaneously perform hydraulic crushing and mechanical cutting crushing to crush the hard accumulation body at the bottom of the drilling mud tank, solves the problems of large work load, high labor intensity, environmental protection, health, safety and limited operation space of manual dredging of the drilling mud tank, can avoid the risk of manual tank cleaning operation in a closed space, improve the tank cleaning efficiency, and has the advantages of simple operation, convenience, fastness, easy integration, installation, disassembly, maintenance, low use cost, high automation, good economy, practicality, safety and environmental protection.

Claims

1. A drilling mud tank decanting system comprising a mixer A (51), a mud tank (50), a line A (49), a liquid phase storage tank (34), a line B (35), a valve A (36), a line C (37), a valve B (38), a hose pump (39), a mixer B (40), a slurry pump (41), a high speed centrifuge (42), a solid phase collection tank (43), a line D (45), a decanting breaker head (46); characterized in that: The mud tank (50) is provided with a stirrer A (51), a hose pump (39), a stirrer B (40), a slurry pump (41), a high-speed centrifuge (42) and a hose pump control cabinet (44) arranged on the tank surface of the liquid phase storage tank (34); the liquid phase storage tank (34) is divided into two non-communicating A compartments (47) and B compartments (48), the A compartments (47) store clean water or clean liquid, and the B compartments (48) collect and store the solid-liquid mixture formed by mixing the sludge tank deposits after being broken and the clean water; the tank surface of the liquid phase storage tank (34) is provided with a pipeline B (35), a valve A (36), a pipeline C (37), a valve B (38), the hose pump (39), the stirrer B (40), the slurry pump (41), the high-speed centrifuge (42), the hose pump control cabinet (44) and a pipeline D (45), and a solid phase collection tank (43) is used for temporarily storing the solid phase separated by the high-speed centrifuge (42); one end of the pipeline A (49) is connected to the upper pipeline interface of the hose pump (39), and the other end is connected to the dredging and breaking head (46); one end of the pipeline B (35) is connected to the lower pipeline interface of the hose pump (39), and the other end is deep into the bottom of the A compartment (47) of the liquid phase storage tank (34), and the valve A (36) is arranged on the pipeline B (35); one end of the pipeline C (37) is connected to the pipeline B (35) at the lower pipeline interface of the hose pump (39), and the valve B (38) is arranged thereon, and the other end is deep into the bottom of the B compartment (48) of the liquid phase storage tank (34); one end of the pipeline D (45) is connected to the liquid outlet of the high-speed centrifuge (42), and the other end is connected to the A compartment (47) of the liquid phase storage tank (34); the dredging and breaking head (46) comprises a shell (23) and a reamer disc (1); the hose pump control cabinet (44) controls the start, forward rotation, reverse rotation and stop of the hose pump (39); the reamer disc (1) is in three groups, and the three groups of reamer discs (1) are annularly and equidistantly arranged on the outer periphery of the shell (23), each group of reamer discs (1) is provided with three cutting blades arranged uniformly, each reamer disc (1) is arranged in the shaft seat of the shell (23) through a reamer shaft (3) and a shaft seat assembly, and the reamer shaft (3) is provided with 5-8 rotor blades (2) arranged axially and equidistantly in a ring shape.

2. The drilling mud tank de-sludging system of claim 1, wherein: The shell (23) of the dredging and breaking head is provided with a liquid inlet (24) at the connecting end, the front end surface of the shell (23) is provided with a plurality of axial straight nozzles (30) distributed circumferentially and equidistantly, the outer periphery of the shell (23) corresponding to the axial straight nozzles (30) is provided with radial inclined nozzles (31) and shaft seats, the axial straight nozzles (30) and the radial inclined nozzles (31) are communicated with the liquid inlet (24) through flow channels (29); the reamer disc (1) corresponds to the shaft seat, the reamer disc (1) is provided with cutting blades, the reamer shaft (3) is provided with a plurality of rotor blades (2) arranged equidistantly and circumferentially, and the position of the blade (2) is opposite to the radial inclined nozzle (31).

3. The drilling mud tank de-sludging system of claim 2, wherein: The shell (23) is a hollow structure, and a valve core (19) is arranged in the shell (23). The valve core (19) is provided with a first radial hole (25) and an axial hole (26). The shell (23) is provided with a valve seat, a center cavity (27), a second radial hole (28) and a flow channel (29). The inlet (24) is sequentially connected with the axial hole (26), the first radial hole (25), the center cavity (27), the second radial hole (28), the flow channel (29), an axial straight nozzle (30) and a radial inclined nozzle (31). The front end surface of the valve core (19) is in dynamic sealing cooperation with the valve seat.

4. The drilling mud tank de-sludging system of claim 3, wherein: The shaft seat assembly comprises: the shaft (17) is supported in the shaft seat of the shell (23) through the back-to-back double bearing (10), and is fixed on the shaft seat of the outer periphery of the shell (23) through the connecting bolt A (4), the throttling ring-shaped sealing cover A (5), the skeleton oil seal A (6), the spacer ring (7), the skeleton oil seal B (8), the oil seal box (9), the O-shaped rubber sealing ring (12), the shaft sleeve (13), the throttling ring-shaped sealing cover B (14), the end cover (15) and the connecting bolt B (16). The reamer shaft (3) on each set of reamer disc (1) is connected to the shaft (17).

5. The drilling mud tank de-sludging system of claim 4, wherein: The back-to-back double bearing (10) is sealed by a bidirectional sealing structure of mechanical dynamic sealing and static sealing. The lubricant is injected into and lubricates the back-to-back double bearing (10) through the straight-through type pressure injection oil cup (11).

6. The drilling mud tank de-sludging system of claim 5, wherein: The spring (20) is further arranged, and the spring (20) presses the valve core (19) on the valve core and valve seat contact surface (32) in the shell (23).

7. The drilling mud tank de-sludging system of any of claims 1-6, characterized by: The reamer disc (1) is provided with a protective cover on the outer periphery.

8. A method of cleaning a drilling mud tank according to any one of claims 1-6, characterized in that: The steps of the method for dredging the drilling mud tank are as follows: first, open the valve A (36) on the pipeline B (35) and close the valve B (38) on the pipeline C (37); control the hose pump control cabinet (44) to make the hose pump (39) rotate forward, suck the clean water in the A bin (47) of the liquid storage tank (34) through the pipeline B (35), and pump the clean water into the dredging and crushing head (46) through the pipeline A (49) under the pump pressure of the hose pump (39) to form a high-pressure water jet; part of the high-pressure water jet directly hydraulically crushes the accumulated body at the bottom of the mud tank (50), and the other part of the high-pressure water jet drives the upper blade of the dredging and crushing head (46) to rotate as power, mechanically cuts and crushes the accumulated body at the bottom of the mud tank; drag the dredging and crushing head (46) and the pipeline A (49) to comprehensively crush all the accumulated bodies in the mud tank (50); second, control the hose pump control cabinet (44) to stop the hose pump (39), and start the agitator A (51) to work, mix the crushed mud deposits and clean water to form a pumpable solid-liquid mixture; third, close the valve A (36) on the pipeline B (35) and open the valve B (38) on the pipeline C (37), control the hose pump control cabinet (44) to make the hose pump (39) reverse, suck the solid-liquid mixture in the mud tank (50) into the hose pump (39) through the dredging and crushing head (46) and the pipeline A (49), and then discharge it into the B bin (48) of the liquid storage tank (34) through the pipeline C (37); fourth, start the agitator B (40), the high-speed centrifuge (42) and the slurry pump (41) in sequence to pump the solid-liquid mixture in the B bin (48) into the high-speed centrifuge (42) for dehydration and separation, discharge the solid phase separated by dehydration into the solid phase collection tank (43), and return the clean water after dehydration and separation to the A bin (47) of the liquid storage tank (34) through the pipeline D (45) for recycling in the next dredging cycle.

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