Waste drilling fluid recovery system

Abstract

The application discloses a kind of waste drilling fluid recovery systems, wherein, screening device is used to screen drilling fluid from well bottom circulation, liquid phase obtained after screening device screening is processed via liquid phase processing system, and solid phase obtained is processed via solid phase processing device;Liquid phase processing system at least includes waste heat power generation device, which is based on the circulating system of carbon dioxide working substance, converts heat energy into kinetic energy by isothermal compression, isochoric heating, isothermal expansion and isochoric cooling four processes to realize power generation.The application can effectively solve the problems of drilling fluid treatment and energy recovery, achieve efficient utilization while achieving harmless treatment, reduce energy consumption and environmental pollution.Current drilling fluid treatment and recovery technology has the pain points of complex equipment, difficult operation, low recovery rate, poor treatment effect, etc., and the system can effectively solve this problem, making the treatment and recovery of waste drilling fluid more simple, efficient and economical.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drilling, in particular to a waste drilling fluid recycling system. BACKGROUND

[0002] The oil-based drilling fluid carries downhole impurities in the circulation process, and contains a large amount of pollutants such as oil, heavy metals and organic matter, which belongs to national hazardous waste. In the drilling operation of kilometer level, the high-speed rotation of the drill bit makes the temperature of the rock wall rise, and through the circulation of the drilling fluid, the generated heat and drilling waste are brought to the ground. The temperature of the drilling fluid when it returns to the ground is still 60-70 degrees. If this part of heat energy cannot be utilized, it will cause great waste.

[0003] At present, for the recycling and treatment of waste drilling fluid, storage, safe landfill, heat treatment, extraction method and other methods are usually used at home and abroad. On the one hand, whether it is reinjection into the stratum or safe landfill, it cannot recover mineral oil, causing waste of resources. On the other hand, heat treatment and extraction method process is complex, the operation cost is high, and the implementation process causes heat energy loss, resource waste and other situations. At the same time, under the background of continuous growth of energy consumption and gradual depletion of traditional fossil energy, many challenges in the environment and climate have been brought, and it has become increasingly important to find clean and efficient energy conversion methods.

[0004] Therefore, it is necessary to design a recycling system to effectively recycle the oil-based drilling fluid SUMMARY

[0005] Therefore, the present application provides a waste drilling fluid recycling system, which can effectively recycle the solid phase and liquid phase in the waste drilling fluid circulating from the bottom of the drilling well.

[0006] The application discloses a waste drilling fluid recycling system, which comprises a screening device, a liquid-phase treatment system and a solid-phase treatment device, wherein the screening device is used for screening drilling fluid circulating from a well bottom to separate the drilling fluid into solid phase and liquid phase; the liquid phase obtained after being screened by the screening device is treated by the liquid-phase treatment system; and the solid phase obtained after being screened by the screening device is treated by the solid-phase treatment device; the liquid-phase treatment system at least comprises a waste heat power generation device, and the waste heat power generation device comprises a compressor, a heat exchanger, a water collector, a water turbine generator and a condenser; the compressor is used for compressing carbon dioxide liquid; the heat exchanger comprises a heat exchange cavity and a liquid-phase pipe arranged in the heat exchange cavity; the inlet of the heat exchange cavity is communicated with the compressor; the carbon dioxide liquid compressed by the compressor can flow through the heat exchange cavity, so that the compressed carbon dioxide liquid exchanges heat with the liquid phase flowing through the liquid-phase pipe to become supercritical carbon dioxide fluid; the water collector is provided with a water collecting cavity; the water collecting cavity is communicated with the outlet of the heat exchange cavity through an open-close type air inlet pipeline, communicated with the condenser through an open-close type air outlet pipeline, and provided with an open-close type water inlet pipeline and a drainage pipeline; the water outlet end of the open-close type drainage pipeline corresponds to the impeller of the water turbine generator; when the open-close type air inlet pipeline and the open-close type drainage pipeline are opened and the open-close type water inlet pipeline and the open-close type air outlet pipeline are closed, the supercritical carbon dioxide fluid can drive the water flow in the water collecting cavity to flow along the open-close type drainage pipeline, so that the water flow impacts the impeller of the water turbine generator, and then drives the water turbine generator to work and generate electricity; when the open-close type air inlet pipeline and the open-close type drainage pipeline are closed and the open-close type water inlet pipeline and the open-close type air outlet pipeline are opened, the supercritical carbon dioxide fluid entering the water collecting cavity enters the condenser to be condensed to recover into carbon dioxide liquid.

[0007] According to the waste drilling fluid recycling system, the liquid-phase pipes of the heat exchanger are in the structure of a snake pipe, four liquid-phase pipes are arranged in the square structure inside the heat exchange cavity; the upper end of each liquid-phase pipe is formed with a liquid inlet, and the lower end is formed with a liquid outlet, so that the liquid phase obtained after being screened flows through the heat exchanger from top to bottom; the upper part of the heat exchanger is provided with a carbon dioxide outlet corresponding to the heat exchange cavity, and the lower part is provided with a carbon dioxide inlet corresponding to the heat exchange cavity, so that the carbon dioxide liquid flows through the heat exchanger from bottom to top.

[0008] According to the waste drilling fluid recycling system, the waste heat power generation device further comprises a carbon dioxide liquid storage device, the carbon dioxide liquid storage device is communicated with the compressor, and the condenser is communicated with the carbon dioxide liquid storage device through a throttle valve.

[0009] According to the waste drilling fluid recycling system, the waste heat power generation device further comprises a temperature sensor, which is used for monitoring the temperature of the carbon dioxide liquid after being condensed in real time.

[0010] The waste drilling fluid recycling system according to the present application, the waste heat power generation device further comprises a pressure sensor for detecting the pressure state of the carbon dioxide liquid before entering the compressor.

[0011] The waste drilling fluid recycling system according to the present application, the liquid phase treatment system further comprises a liquid phase cleaning device, in which the liquid phase is treated by means of an oil cleaning agent and a treatment agent, the oil cleaning agent comprises 30% demulsifier compound, 1.5% coagulant and 2% polyacrylamide flocculant, and the treatment agent is composed of adsorbent, coagulant, gel breaker and petroleum ether, and the distillation range is 90-120℃.

[0012] The waste drilling fluid recycling system according to the present application, wherein the drilling fluid solid phase treatment device comprises grinding means, stirring means and extruding means, wherein the grinding means is used for grinding the wet solid phase particles from the drilling fluid, the stirring means is used for receiving the particles after grinding by the grinding means and mixing and stirring them together with building auxiliary materials, and the extruding means is arranged below the discharge port of the stirring means for receiving the material after stirring by the stirring means, and the extruding means can extrude the material to squeeze out the moisture; the stirring means and the grinding means are arranged in a state that the two rotation center lines are relatively perpendicular, and the stirring means and the grinding means are driven to work by the power of the same power source. According to the drilling fluid solid phase treatment device according to the present application, the wet solid phase particles from the drilling fluid are subjected to a "three-stage" treatment of grinding-mixing stirring-extrusion forming, and finally the solid phase waste materials in the drilling fluid can be converted into raw materials for the building industry, achieving efficient utilization and harmless treatment, reducing energy consumption and environmental pollution, and reducing the production cost of enterprises.

[0013] The waste drilling fluid recycling system according to the present application, wherein the drilling fluid solid phase treatment device further comprises a heating and dehydrocarbon mechanism, the heating and dehydrocarbon mechanism comprises heat collecting means, a heating element arranged at the bottom of the extruding means, and a heat delivery pipe connected with the heat collecting means and used for delivering a heat medium to the heating element to heat it, and by means of the heating of the heating element, the material in the extruding means can be heated to volatilize the hydrocarbon substances in the material.

[0014] The waste drilling fluid recycling system according to the present application, wherein the heat collecting means of the drilling fluid solid phase treatment device is a solar heat collector, and the heat medium is oil.

[0015] The waste drilling fluid recycling system according to the present application, wherein the drilling fluid solid phase treatment device further comprises oil-water separation means, the oil-water separation means is communicated with the upper part of the extruding means through a first pipeline for receiving the volatilized hydrocarbon substances, and communicated with the bottom of the extruding means through a second pipeline for receiving the squeezed-out moisture.

[0016] According to the waste drilling fluid recycling system, the oil-water separation device of the drilling fluid solid phase treatment device comprises a shell, a filter screen and a filter column, the filter screen and the filter column are annular and are arranged in sequence and concentrically from outside to inside, the shell is provided with a water outlet communicated with the inner hollow channel of the filter column, and the squeezed water is sequentially introduced into the shell, the filter screen and the filter column through the second pipeline and discharged from the water outlet.

[0017] According to the waste drilling fluid recycling system, the filter column is a zeolite column.

[0018] According to the waste drilling fluid recycling system, the squeezing device of the drilling fluid solid phase treatment device comprises a squeezing plate, the squeezing plate is arranged in the squeezing device in a movable manner and is used for squeezing the material in the squeezing device; the squeezing device further comprises a humidity-sensitive capacitor for detecting whether the humidity of the material in the squeezing device is qualified, and an electrode of the humidity-sensitive capacitor is arranged on the squeezing plate in a manner that pressure is formed between the electrode and the squeezing plate.

[0019] According to the waste drilling fluid recycling system, the squeezing device of the drilling fluid solid phase treatment device further comprises a side door plate arranged at a side and corresponding to the position of the material, the side door plate can be controlled to be opened when the humidity-sensitive capacitor detects that the humidity of the material in the squeezing device is qualified; when the side door plate is opened, the squeezing plate can be pushed to continue to move forward in the squeezing direction, so that the squeezed material is squeezed out from the opening of the side door plate.

[0020] According to the waste drilling fluid recycling system, the drilling fluid solid phase treatment device further comprises a side door plate opening and closing mechanism, the side door plate opening and closing mechanism comprises two synchronous pulleys and a synchronous belt matched on the two synchronous pulleys, and the side door plate is fixedly connected with the synchronous belt.

[0021] According to the waste drilling fluid recycling system, the drilling fluid solid phase treatment device further comprises a driving transmission mechanism, the driving transmission mechanism comprises a worm, a grinding transmission worm wheel and a stirring transmission worm wheel, the worm receives power from a power source, the grinding transmission worm wheel and the stirring transmission worm wheel are engaged with the worm to form a worm and gear transmission pair, and the axis of the grinding transmission worm wheel and the axis of the stirring transmission worm wheel are perpendicular to each other; the driving transmission mechanism further comprises a stirring transmission shaft, a grinding transmission shaft and a grinding gear pair, the stirring transmission worm wheel is fixedly arranged on the stirring transmission shaft, the stirring transmission shaft is used for inputting power to a stirring device, and the grinding gear pair comprises a driving gear and a driven gear, the driving gear and the grinding transmission gear are coaxially fixed on the grinding transmission shaft, and the driven gear is engaged with the driving gear and is used for inputting power to a grinding device.

[0022] Beneficial effects: the system can effectively solve the problems of drilling fluid treatment and energy recovery, achieve efficient utilization while achieving harmless treatment, reduce energy consumption and environmental pollution. And the current drilling fluid treatment and recovery technology has the pain points of complex equipment, difficult operation, low recovery rate, poor treatment effect, etc., and the system can effectively solve these problems, making the treatment and recovery of waste drilling fluid more simple, efficient and economical.

[0023] The waste drilling fluid recovery system of the present application is disclosed in detail below in combination with the embodiments shown in the drawings and the reference numerals. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the overall assembly drawing of the waste heat power generation device in the present application.

[0025] Figure 2 It is the perspective view of the heat exchanger in the present application.

[0026] Figure 3 It is the plan view of the heat exchanger in the present application.

[0027] Figure 4 It is Figure 3 A-A sectional view.

[0028] Figure 5 It is the overall structure schematic diagram of the drilling fluid solid phase treatment device in the present application.

[0029] Figure 6 It is Figure 5 Side view.

[0030] Figure 7 It is the perspective view of the extrusion device.

[0031] Figure 8 It is the side view of the extrusion device, wherein the extrusion plate is schematically shown by partial section.

[0032] Figure 9 It is the structure schematic diagram of the heating hydrocarbon removal mechanism.

[0033] Figure 10 It is the external structure schematic diagram of the oil-water separator.

[0034] Figure 11 It is Figure 10 Sectional view from A-A.

[0035] Figure 12 It is the structure schematic diagram of the extrusion device cooperating with the heating hydrocarbon removal mechanism and the oil-water separator device.

[0036] Figure 13 It is the structure schematic diagram of the discharging opening and closing mechanism of the stirring device. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0038] It should be noted that all direction indications (such as up, down, left, right, front, back, and the like) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, and the like between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the direction indications also change accordingly.

[0039] In addition, the descriptions involving “first”, “second”, and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined with “first”, “second” can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of a person of ordinary skill in the art, and when the combination of the technical solutions contradicts each other or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and is also not within the protection scope required by the present application.

[0040] The application provides a waste drilling fluid recycling system, which comprises a screening device (not shown in the drawings), a liquid phase treatment system and a solid phase treatment device, wherein the screening device is used for screening drilling fluid circulating from a well bottom to separate the drilling fluid into solid phase and liquid phase, and the screening device can be a vibrating screen; the liquid phase obtained after the screening of the screening device is treated through the liquid phase treatment system, and the solid phase obtained after the screening of the screening device is treated through the solid phase treatment device; the liquid phase treatment system at least comprises a waste heat power generation device, and the waste heat power generation device comprises a compressor 37, a heat exchanger 38, a water collector 39, a water turbine generator 40 and a condenser 41, wherein the compressor 37 is used for compressing carbon dioxide liquid, the heat exchanger 38 comprises a heat exchange cavity 42 and a liquid phase pipe 43 arranged in the heat exchange cavity 42, the inlet of the heat exchange cavity 42 is communicated with the compressor 37, the carbon dioxide liquid compressed by the compressor 37 can flow through the heat exchange cavity 42, so that the compressed carbon dioxide liquid exchanges heat with the liquid phase flowing through the liquid phase pipe 43 to become supercritical carbon dioxide fluid; the water collector 39 is provided with a water collecting cavity, wherein the water collecting cavity is communicated with the outlet 46 of the heat exchange cavity 42 through an open-close type air inlet pipeline, communicated with the condenser 41 through an open-close type air outlet pipeline, and provided with an open-close type water inlet pipeline and a drainage pipeline, and the water outlet end of the open-close type drainage pipeline corresponds to the impeller 45 of the water turbine generator 40. In the application, the open-close type pipelines are controlled by valves.

[0041] In the waste heat power generation device of the application, the carbon dioxide liquid compressed by the compressor 37 flows into the heat exchanger 38 and exchanges heat with the drilling fluid of the external system, the drilling fluid flows into the heat exchanger 38 through the liquid phase pipe 43 and transfers heat to the carbon dioxide liquid in the flowing process, and in this process, the temperature drops by about 13℃. With the gradual increase of carbon dioxide in the heat exchanger 38, the heat exchange process of the carbon dioxide liquid and the drilling fluid is steadily carried out, and after the heat exchange is completed, the carbon dioxide liquid becomes supercritical carbon dioxide fluid. After coming out of the heat exchanger 38, the supercritical carbon dioxide fluid enters the water collector 39 to do work, at this time, the open-close type air inlet pipeline and the open-close type drainage pipeline are opened, and the open-close type water inlet pipeline and the open-close type air outlet pipeline are closed, so that the supercritical carbon dioxide fluid can push the water flow in the water collecting cavity to flow along the open-close type drainage pipeline, so that the water flow impacts the impeller of the water turbine generator 40, and then drives the water turbine generator 40 to work and generate electricity. When the water does work, the open-close type air inlet pipeline and the open-close type drainage pipeline are closed, and the open-close type water inlet pipeline and the open-close type air outlet pipeline are opened, so that the supercritical carbon dioxide fluid entering the water collecting cavity enters the condenser 41 to be condensed to recover into carbon dioxide liquid, and the water and carbon dioxide continue to circulate to enter the next working state.

[0042] The waste heat power generation device in the application is a cycle system based on carbon dioxide working medium, which converts heat energy into kinetic energy to realize power generation through four processes of isothermal compression, isochoric heating, isothermal expansion and isochoric cooling. In the system, the carbon dioxide is cooled in the condenser 41, isothermally compressed in the compressor 37, isochorically heated through the heat exchanger 38, isothermally expanded in the water collector 39, drives the water turbine and drives the generator to generate electricity. Finally, the working medium carbon dioxide isochorically cooled in the condenser 41 again, isothermally compressed in the compressor 37, and completes a cycle. The system has the characteristics of high efficiency and low emission, and provides a new solution for sustainable development.

[0043] In the waste heat power generation system of the application, the parameter selection Δt is 13℃, the circulating liquid flow a is 3781.69m 3 / h, the specific heat capacity c of the drilling fluid is 2.1868kJ / (kg·℃), and the heat that can be extracted from the waste heat source is:

[0044]

[0045] The design capacity of each power generation equipment (unit) is 665kW, and according to the pressure difference H between the cold end and the hot end and the rated power of the power generation equipment, the required working medium high-pressure gas volume flow Q1 is:

[0046] Pn=0.75×0.81HQ1;

[0047] The design pressure difference Δp is 4MPa, and the calculation shows that the required high-pressure gas volume flow Q1 is 0.226m3 / s.

[0048] Under the required volume flow, the waste heat heat q that needs to be absorbed is:

[0049] q=Q1ρ(h1-h2);

[0050] Under the design state, when the pressure is 7.3MPa, the CO2 working medium is raised by 2℃, and the calculation shows that the required waste heat heat q is 2062.1kW, and the waste heat utilization rate of each power generation equipment is

[0051]

[0052] The possible power generation capacity of the cooling water circulating heat source is:

[0053] p=7764.4×32.3%=2507.9kW.

[0054] The liquid phase pipe 43 of the heat exchanger 38 is in a snake pipe structure, four liquid phase pipes 43 are arranged in a square structure inside the heat exchange cavity 42, the upper end of each liquid phase pipe 43 is formed with a liquid inlet 48, and the lower end is formed with a liquid outlet 49, so that the liquid phase obtained after screening flows through the heat exchanger 38 from top to bottom, the upper part of the heat exchanger 38 is provided with a carbon dioxide outlet 47 corresponding to the heat exchange cavity 42, and the lower part is provided with a carbon dioxide inlet 46 corresponding to the heat exchange cavity 42, so that the carbon dioxide liquid flows through the heat exchanger 38 from bottom to top.

[0055] At present, there are a large number of low-heat-value waste heat resources (100℃ or less, normal pressure or low pressure) in various fields of industry in China, and the conventional power generation technology lacks effective technical means, and the working parameters are mostly high parameters and large capacity, so that this part of heat value energy cannot be utilized. The heat contained in the drilling fluid liquid phase is transmitted to the liquid carbon dioxide through the "four-pipe snake heat exchanger 38", so that it is converted into a supercritical carbon dioxide fluid, the phase change of the carbon dioxide continuously provides propelling force for the liquid water source in the water collector 39, and then provides power for the air pressure type water turbine for power generation. The subsequent condenser 41 and evaporator are used to reduce the pressure of the carbon dioxide, so that it can be recycled. The problem that the conventional power generation technology cannot utilize low-temperature waste heat sources is solved. The lowest heat source temperature that can be used for power generation is 40-80℃, and the range of waste heat recovery resources that can be used for power generation is widened.

[0056] The oil-based drilling fluid contains emulsifiers, petroleum and other substances, in order to reduce the pressure for cleaning the heat exchanger 38 in the later period, and also to avoid that too many impurities are accumulated to have too great influence on the heat exchange effect, the application provides a "four-pipe snake heat exchanger 38" with simple structure, the curved pipeline inside increases the heat exchange area, four heat exchange pipes are adopted to increase the volume of simultaneous heat exchange, the equipment is detachable, and compared with other heat exchange modes, it is easier to clean and replace.

[0057] In the application, pressure detection sensors and temperature detection sensors are arranged in front of and behind the heat exchanger 38, the temperature and pressure before heat exchange and the pressure and temperature changes during heat exchange are detected, the heat exchange effect is observed, and the inside of the device can be checked in time when the heat exchange effect is low.

[0058] According to the waste drilling fluid recovery system, the waste heat power generation device further comprises a carbon dioxide liquid storage device 44, the carbon dioxide liquid storage device 44 is connected with the compressor 37, and the condenser 41 is connected with the carbon dioxide liquid storage device 44 through a throttle valve.

[0059] The waste drilling fluid recycling system according to the present application, the waste heat power generation device further comprises a temperature sensor for monitoring the temperature of the condensed carbon dioxide liquid in real time. The temperature sensor is used to monitor the temperature of the condensed carbon dioxide in real time, to adjust the condensing effect of the condenser 41, to reduce the temperature to the required range, and to ensure normal operation of the system and power generation efficiency.

[0060] The waste drilling fluid recycling system according to the present application, the waste heat power generation device further comprises a pressure sensor for detecting the pressure state of the carbon dioxide liquid before entering the compressor 37. In the entire system, the carbon dioxide is in a supercritical high-pressure state before entering the water collector 39, the pressure decreases after work is done, and the isothermal compression of the compressor 37 continues the next cycle. The pressure state of the carbon dioxide at this time is detected by the pressure sensor to adjust the work and air intake of the gas and other parameters, so that the pressure condition of the inlet of the compressor 37 is reached. The pressure detection module here uses XGZ040, the measurement range is 0-40kPa, the MEMS technology is adopted, it is suitable for non-corrosive gas, and the working temperature range is -30℃-+100℃.

[0061] The waste drilling fluid recycling system according to the present application, the liquid phase treatment system further comprises a liquid phase cleaning device, and the liquid phase is treated by means of an oil removal agent and a treatment agent in the liquid phase cleaning device. The oil removal agent comprises 30% demulsifier compound, 1.5% coagulant and 2% polyacrylamide flocculant, and the rest is water. The treatment agent is composed of adsorbent, coagulant, gel breaker and petroleum ether, and the distillation range is 90-120℃. After the oil recovery of the waste oil-based drilling fluid, the physical and chemical effects are used to neutralize and reduce the negative charge on the surface of the clay particles in the sludge, so that the sludge loses stability, and the treated sludge can be used as the material for the well site cofferdam and the flat ground.

[0062] Combining Figures 5-13 As shown in the figure, the drilling fluid solid phase treatment device of the present application comprises grinding means 1, stirring means 2 and extruding means 3, wherein the grinding means 1 is used for grinding the wet solid phase particles from the drilling fluid, the stirring means 2 is used for receiving the particles after grinding by the ball mill and mixing and stirring them with building auxiliary materials, and the extruding means 3 is arranged below the discharge port of the stirring means 2 for receiving the material after stirring by the stirring means 2, and the extruding means 3 can extrude the material to extrude out the moisture; the stirring means 2 and the grinding means 1 are arranged in a state that the two rotation center lines are relatively perpendicular, and the stirring means 2 and the grinding means 1 are driven to work by the power of the same power source. In a preferred embodiment, the grinding means 1 is a ball mill, the outside of which is provided with a dust cover, the stirring means 2 is a vertical stirrer, and the feeding port of the extruding means 3 is arranged opposite to the lower discharge port of the stirrer.

[0063] In a preferred embodiment, the driving transmission mechanism further comprises a worm 4, a grinding transmission worm wheel 5 and a stirring transmission worm wheel 6, the worm 4 receives power from a power source, the grinding transmission worm wheel 5 and the stirring transmission worm wheel 6 are engaged with the worm 4 to form a worm and gear transmission pair, the axis of the grinding transmission worm wheel 5 and the axis of the stirring transmission worm wheel 6 are perpendicular to each other; the driving transmission mechanism further comprises a stirring transmission shaft 7, a grinding transmission shaft 8 and a grinding gear pair, the stirring transmission worm wheel 6 is fixed on the stirring transmission shaft 7, the stirring transmission shaft 7 is used to input power to the stirring device 2, the grinding gear pair comprises a driving gear 9 and a driven gear 10, the driving gear 9 and the grinding transmission gear are coaxially fixed on the grinding transmission shaft 8, the driven gear 10 is engaged with the driving gear 9, and the driven gear 10 is used to input power to the grinding device 1.

[0064] In the above implementation process, after the waste drilling fluid is screened by the screening device, the wet solid particles are first transported to the grinding device 1, the motor drives the worm 4 to rotate, and the power is sequentially transmitted to the worm 4, the grinding transmission worm wheel 5, the grinding transmission shaft 8, the driving gear 9 of the grinding gear pair, the driven gear 10 of the grinding gear pair, and then to the grinding device 1, so as to drive the grinding device 1 to work. At the same time, the power generated by the motor driving the worm 4 to rotate is also transmitted to the stirring device 2 through the worm 4, the stirring transmission worm wheel 6 and the stirring shaft, so as to drive the stirring device 2 to work. In the present application, by means of the driving transmission mechanism of the present application, the stirring device 2 and the grinding device 1 can be driven to work by the power of the same power source, not only can save energy and achieve the purpose of one machine with multiple functions, but also greatly improve the power integration of the whole system, and the operator can control a single power source to realize the simultaneous control of the grinding device 1 and the stirring device 2.

[0065] In the present application, a dust cover 11 is arranged outside the grinding device 1 to prevent smoke dust from flying out, the materials after being ground by the grinding device 1 are discharged through the overflow discharge way at the lower part of the dust cover 11, and the discharge port of the grinding device 1 is communicated with the feeding port of the stirring device 2 through a screw conveyor (not shown in the figure) to convey the materials discharged from the discharge port of the grinding device 1 into the stirring device 2.

[0066] In the present application, in the driving transmission mechanism, the axes of the grinding transmission worm wheel 5 and the stirring transmission worm wheel 6 are kept perpendicular to each other, so that the horizontal ball mill as the grinding device 1 and the vertical stirrer as the stirring device 2 can be driven in one power system, and the spatial layout of the grinding device 1 and the stirring device 2 becomes more reasonable and the work becomes more smooth.

[0067] In the present application, the building auxiliary materials are added into the stirring device 2 together with the material ground by the grinding device 1 to form a mixture in the stirring device 2. The building auxiliary materials can be roadbed materials, such as 40% fly ash, 5% lime, 10% gypsum, 5% cement, and 10% loess. The mixture in the stirring device 2 can be output from the discharge port at the lower end after being fully mixed. The extruding device 3 is arranged vertically below the stirring device 2, and the feeding port of the extruding device 3 is opposite to the discharge port of the stirring device 2, so that the fully mixed mixture can enter the extruding device 3 when the discharge port of the stirring device 2 is opened.

[0068] In the present application, the discharge opening and closing mechanism corresponding to the discharge port of the stirring device includes a discharge control motor 12, a lead screw 13 coaxially driven with the discharge control motor 12, a push plate 14 sleeved on the lead screw 13 and threadedly matched with the lead screw, and the push plate 14 is arranged in a circumferential rotation limited manner, that is, when the lead screw 13 is driven to rotate, the push plate 14 is arranged in a manner capable of linear reciprocating along the lead screw 13. The discharge opening and closing mechanism further includes a push rod 15 arranged in parallel with the lead screw, one end of the push rod 15 is fixedly connected with the push plate 14, and the other end of the push rod 15 extends into the interior of the bottom side of the stirring device, and then is fixedly connected with an opening and closing plate 36, which can open or close the discharge port of the stirring device under the driving of the push plate 14.

[0069] The discharge opening and closing mechanism can realize timed and quantitative discharging through electrical control. When the discharge control motor is forward rotated, the push rod 15 can be controlled to advance forward, so that the opening and closing plate 36 closes the discharge port of the stirring device 2, and then the stirring device 2 can keep rotating all the time; when the stirring is completed, the discharge control motor is reversed, so that the opening and closing plate 36 can be retreated backward through the cooperation of the lead screw 13, the push plate 14 and the push rod 15, so that the discharge port of the stirring device 2 is opened, and the stirred solid mixture can be discharged.

[0070] In the present application, the extruding device 3 comprises an extruding plate 23 arranged in the extruding device 3 in a movable manner and used for extruding the material in the extruding device 3; the extruding device 3 further comprises a humidity-sensitive capacitor for detecting whether the humidity of the material in the extruding device 3 is qualified, and the electrode of the humidity-sensitive capacitor is arranged on the extruding plate 23 in a manner that pressure is formed between the electrode and the extruding plate 23. In the present application, the extruding device 3 further comprises a side door plate 19 arranged at the side and corresponding to the position of the material, which can be controlled to be opened when the humidity-sensitive capacitor detects that the humidity of the material in the extruding device 3 is qualified; when the side door plate 19 is opened, the extruding plate 23 can be pushed to continue moving forward in the extruding direction, so that the extruded material is extruded from the opening formed after the opening of the side door plate 19. The opening and closing mechanism of the side door plate 19 comprises two synchronous pulleys 20 and a synchronous belt 21 matched on the two synchronous pulleys 20, and the side door plate 19 is fixedly connected with the synchronous belt 21 through an L-shaped connecting rod 22.

[0071] When the mixed solid-phase material after being stirred is introduced into the extruding device 3 from the stirring device 2, the extruding plate 23 in the extruding device 3 can be pushed forward by the pushing rod 24 under the pushing of the hydraulic system, so as to extrude the material. The humidity-sensitive capacitor arranged on the extruding plate 23 is used for detecting whether the humidity of the extruded material is qualified, and when the detection is unqualified, the material is re-pressed, and when the detection is qualified, the side door plate 19 can be controlled to be opened by the controller, and the extruding plate 23 is pushed forward again under the pushing of the hydraulic system, so that the material in the extruding device 3 is extruded from the opening after the opening of the side door plate 19, that is, the side edge discharging is formed on the extruding device 3.

[0072] In the present application, the controller is connected with the humidity-sensitive capacitor in a signal connection manner, and the controller is connected with the synchronous pulley 20 driving motor in the opening and closing mechanism of the side door plate 19, so that when the moisture detection is qualified, the controller controls the synchronous pulley 20 motor to work, and then drives the synchronous belt to rotate, so that the side door plate 19 is opened.

[0073] In the preferred embodiment of the present application, the heating and dehydrocarbon mechanism is further included, which comprises a heat collecting device 25, a heating element 27 arranged at the bottom of the extruding device 3, and a heat delivery pipe 26 connected with the heat collecting device 25 and used for delivering the heat medium to the heating element 27 to heat the heating element 27. By means of the heating of the heating element 27, the material in the extruding device 3 can be heated to volatilize the hydrocarbon substances in the material. The heat collecting device 25 is a solar heat collector, and the heat medium is oil which is not easy to burn and has high temperature.

[0074] In the implementation process of the above hydrocarbon-removing heating mechanism, the heat collector absorbs the heat of the solar energy to heat the heat medium, the heat collector has a liquid inlet 28 and a liquid outlet 29, the heat medium enters the heat collector from the liquid inlet, and enters the heat transfer pipeline from the liquid outlet, the heat transfer pipeline includes a main pipeline and branch pipelines, the branch pipelines are arranged in plurality and are uniformly arranged opposite to the bottom of the extrusion device 3, so that the heated element is uniformly heated, the end of the branch pipeline is connected with the ceramic sheet as the heated element 27, so as to heat the ceramic sheet. By means of heating the ceramic sheet, the temperature of the material in the extrusion device 3 is raised, so that the hydrocarbon substances in the material are volatilized.

[0075] In the present application, the extrusion device 3 includes a material supporting bottom plate, and the ceramic sheet as the heated element 27 is integrally arranged on the material supporting bottom plate, or, in a preferred embodiment, the material supporting bottom plate is made of the ceramic sheet.

[0076] In the present application, the oil-water separation device 16 is further included, which is communicated with the upper part of the extrusion device 3 through the first pipeline 17 for receiving the volatilized hydrocarbon substances, and is communicated with the bottom of the extrusion device 3 through the second pipeline 18 for receiving the squeezed water. The oil-water separation device 16 includes a shell 30, a filter screen 31 and a filter column 32, the filter screen 31 and the filter column 32 are both annular and are arranged in sequence and concentrically from outside to inside, the shell 30 is provided with a water outlet 33 communicated with the inner hollow channel of the filter column 32, and the squeezed water successively enters the shell 30, the filter screen 31 and the filter column 32 through the second pipeline, and is discharged from the water outlet 33. The filter column 32 is a zeolite column.

[0077] In the working process of the oil-water separation device 16, the waste water generated by the extrusion enters the oil-water separation device 16 from the water inlet 34 of the lower part of the separation device through the water outlet 33 of the lower part of the extrusion device 3, and the volatilized hydrocarbon substances enter the oil-water separation device 16 through the air inlet 35 arranged at the top of the separation device, so as to be conveniently collected and treated.

[0078] The working process of the solid phase treatment device of the present application is as follows: after the overall device is started, the wet solid phase particle waste enters the grinding device 1 for primary treatment, the ball mill as the grinding device 1 grinds the wet solid phase particles to 400 μm, the solid phase small particle material after the primary treatment enters the stirring device 2 through the spiral conveying pipeline, and the building auxiliary material is added in the stirring device 2 for sufficient stirring and mixing as secondary treatment, and then the mixed material is subjected to the extrusion work in the extrusion device 3 as tertiary treatment, so as to squeeze out the water in the mixed material and volatilize the hydrocarbon substances therein, thereby collecting the raw material which can be used in the building industry, achieving efficient utilization and harmless treatment, reducing energy consumption and environmental pollution, and reducing the production cost of the enterprise.

[0079] The recycling system of the present application can effectively solve the problems of drilling fluid treatment and energy recovery, achieve efficient utilization while achieving harmless treatment, and reduce energy consumption and environmental pollution. And the current drilling fluid treatment and recycling technology has the pain points of complex equipment, difficult operation, low recovery rate, poor treatment effect and the like. The system can effectively solve the problems, and the treatment and recycling of waste drilling fluid are more convenient, efficient and economical.

[0080] Moreover, considering that the general drilling site is relatively remote, the transportation of the equipment is also a crucial link in the future. The device adopts a detachable design, has high portability and transportability, and is convenient to use between two drilling sites. The device achieves part transportation, rapid disassembly and replacement, reduces transportation cost, maintenance cost and downtime, and is also convenient for equipment upgrading and modification. Therefore, the device has excellent adaptability and flexibility.

[0081] Finally, it is pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the purpose and scope of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A spent drilling fluid recycling system, characterized by, The application relates to a drilling fluid treatment system. The drilling fluid treatment system comprises: a screening device for screening drilling fluid circulating from a well bottom into solid phase and liquid phase; a liquid phase treatment system for treating the liquid phase obtained after screening by the screening device; a solid phase treatment device for treating the solid phase obtained after screening by the screening device; the liquid phase treatment system at least comprises a waste heat power generation device, the waste heat power generation device comprises a compressor, a heat exchanger, a water collector, a water turbine generator and a condenser, wherein the compressor is used for isothermal compression of carbon dioxide liquid, the heat exchanger comprises a heat exchange cavity and a liquid phase pipe arranged in the heat exchange cavity, the inlet of the heat exchange cavity is communicated with the compressor, the carbon dioxide liquid compressed by the compressor can flow through the heat exchange cavity, so that the compressed carbon dioxide liquid exchanges heat with the liquid phase flowing through the liquid phase pipe to realize isochoric heating and become supercritical carbon dioxide fluid; the water collector is provided with a water collecting cavity, wherein the water collecting cavity is communicated with the outlet of the heat exchange cavity through an open-close type air inlet pipeline, communicated with the condenser through an open-close type air outlet pipeline, and provided with an open-close type water inlet pipeline and a drainage pipeline, and the water outlet end of the open-close type drainage pipeline corresponds to the impeller of the water turbine generator; when the open-close type air inlet pipeline and the open-close type drainage pipeline are opened and the open-close type water inlet pipeline and the open-close type air outlet pipeline are closed, the supercritical carbon dioxide fluid enters the water collecting cavity to realize isothermal expansion, so as to provide propelling force for the liquid water in the water collecting cavity by means of the phase change of carbon dioxide, so that the water flow in the water collecting cavity can be pushed along the open-close type drainage pipeline, so that the water flow impacts the impeller of the water turbine generator, and then drives the water turbine generator to work and generate electricity; 2. The spent drilling fluid recovery system of claim 1, wherein, when the open-close type air inlet pipeline and the open-close type drainage pipeline are closed and the open-close type water inlet pipeline and the open-close type air outlet pipeline are opened, the supercritical carbon dioxide fluid entering the water collecting cavity enters the condenser to realize isochoric cooling, so as to be condensed and recovered into carbon dioxide liquid. The liquid phase pipe of the heat exchanger is in a snake structure, four liquid phase pipes are arranged in a square structure in the heat exchange cavity; the upper end of each liquid phase pipe is formed with a liquid inlet, and the lower end is formed with a liquid outlet, so that the liquid phase obtained after screening flows through the heat exchanger from top to bottom; 3. The spent drilling fluid recovery system of claim 1, wherein, the upper part of the heat exchanger is provided with a carbon dioxide outlet corresponding to the heat exchange cavity, and the lower part is provided with a carbon dioxide inlet corresponding to the heat exchange cavity, so that the carbon dioxide liquid flows through the heat exchanger from bottom to top.

4. The spent drilling fluid recovery system of claim 1, wherein, The waste heat power generation device further comprises a carbon dioxide liquid storage device, the carbon dioxide liquid storage device is communicated with the compressor, and the condenser is communicated with the carbon dioxide liquid storage device through a throttle valve.

5. The spent drilling fluid recovery system of claim 1, wherein, The waste heat power generation device further comprises a temperature sensor for monitoring the temperature of the carbon dioxide liquid after condensation in real time. The waste heat power generation device further comprises a pressure sensor for detecting the pressure state of the carbon dioxide liquid before entering the compressor.

6. The spent drilling fluid recovery system of claim 1, wherein, The liquid phase treatment system further comprises a liquid phase cleaning device, in which the liquid phase is treated by means of oil cleaning agent and treatment agent, the oil cleaning agent comprises 30% demulsifier compound, 1.5% coagulant and 2% polyacrylamide flocculant, and the treatment agent is composed of adsorbent, coagulant, gel breaker and petroleum ether with a distillation range of 90-120℃.

7. The spent drilling fluid recovery system of claim 1, wherein, The solid phase treatment device comprises: a grinding device for grinding the wet solid phase particles from the drilling fluid; a stirring device, the feeding port of the stirring device being communicated with the discharging port of the grinding device, for receiving the material ground by the grinding device and mixing the material with the building auxiliary materials; a squeezing device arranged below the discharging port of the stirring device for receiving the mixed material sufficiently mixed in the stirring device, the squeezing device being capable of squeezing the material to squeeze out the water; the grinding device is a horizontal ball mill, the stirring device is a vertical stirrer, the stirring device and the grinding device are arranged in a state that the two rotation center lines are relatively perpendicular, and the stirring device and the grinding device are driven to work by the power of the same power source.

8. The spent drilling fluid recovery system of claim 7, wherein, The solid phase treatment device further comprises a driving transmission mechanism, the driving transmission mechanism comprises a worm, a grinding transmission worm wheel and a stirring transmission worm wheel, the worm receives the power from the power source, the grinding transmission worm wheel and the stirring transmission worm wheel are engaged with the worm to form a worm and gear transmission pair, and the axis of the grinding transmission worm wheel and the axis of the stirring transmission worm wheel are relatively perpendicular; the driving transmission mechanism further comprises a stirring transmission shaft, a grinding transmission shaft and a grinding gear pair, the stirring transmission worm wheel is fixed on the stirring transmission shaft, the stirring transmission shaft is used for inputting power into the stirring device, the grinding gear pair comprises a driving gear and a driven gear, the driving gear and the grinding transmission worm wheel are coaxially fixed on the grinding transmission shaft, the driven gear is engaged with the driving gear, and the driven gear is used for inputting power into the grinding device.

9. The spent drilling fluid recovery system of claim 7, wherein, The solid phase treatment device further comprises a heating and dehydrocarbon mechanism, the heating and dehydrocarbon mechanism comprises a heat collecting device, a heating element arranged at the bottom of the squeezing device and a heat delivery pipe connected with the heat collecting device and used for delivering heat medium to the heating element to heat the heating element, and the material in the squeezing device can be heated to volatilize the hydrocarbon substances in the material by means of the temperature rise of the heating element.

10. The spent drilling fluid recovery system of claim 7, wherein, The solid phase treatment device further comprises an oil-water separation device, the oil-water separation device is communicated with the upper part of the squeezing device through a first pipeline for receiving the volatilized hydrocarbon substances and communicated with the bottom of the squeezing device through a second pipeline for receiving the squeezed water.

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