1489 results about "Bottom water" patented technology

A double level ant-proof pet food bowl includes a top food container having a first recess at a center of a bottom side of a base of the food container; bottom water container having a second recess at a center of an upper side of a base of the water container; and a central post having an upper end inserted into the first recess, and a lower end inserted into the second recess. The top food container resides on top of the central post and above the bottom water container.

The invention relates to a method for ameliorating a saline and alkaline land, in particular to a method for ameliorating a saline and alkaline land with heavily adhesive soil, which comprises: building raised fields to form a pattern of alternately distributed raised fields and shallow pools; preparing a raised field 1 to make a slope with two inclined sides, applying crushed straw and fermented cow dung on the surfaces of the raised fields, deeply plowing and raking the raised fields flat, wherein the vertical structure of each raised field comprises a bottom water isolating layer, bottom discharge pipes, a top water isolating layer and ridges from bottom up; and pilling sea ice or saline ice in the shallow pools on the surfaces of the raised fields, covering non-woven fabrics or crop straw on the surface of ice piles, and fixing covering materials on the surfaces of the raised fields. The method has the characteristics of high rate of desalination, soil fertility improvement, drought resistance and soil moisture conservation.

An integrated bioreactor and its applications as well as a method for treatment of highly-concentrated organic wastewater using the same. The integrated bioreactor with a concentric columnar structure includes an inner layer and an outer layer, in which the inner layer is an upflow anaerobic sludge blanket (UASB) and the outer layer is a moving bed biofilm reactor (MBBR). The effluent of the MBBR is recycled into UASB via a reflux pump mounted between a water tank and the integrated bioreactor. A water outlet of the UASB is arranged with an on-line pH monitor and a mechanical agitation device is arranged on the top of a bottom water distributor. The bioreactor is low in cost, features friendly maintenance, stable operation, and high degree of automation, and can be applied under low temperature.

The invention discloses a three-dimensional physical simulation experimental apparatus of a heterogeneous bottom-water reservoir and a saturation determining method thereof. The apparatus comprises a core holder (1), a confining pressure pump (9), a constant-pressure constant-speed displacement valve A (7), a piston container A (23), an oil-gas-water meter B (4), a back pressure device A (5), an oil-gas-water meter A (3), a back pressure device B (6), a constant-temperature tank (2), a constant-pressure constant-speed displacement valve B (8), a piston container B (24), a pressure meter A (19), a pressure meter B (21), a pressure meter C (20) and a pressure meter D (22). The apparatus is suitable for planar and vertical heterogeneous displacement experimental researches, research on influence of edge-bottom water upon displacement, and real-time analysis on oil (gas) and water saturation distribution.

The invention discloses a coal bed methane reservoir pulverized coal generation, migration, sedimentation, blocking dynamic evaluation instrument which comprises a core displacement module, a vacuumizing module, a visualized core clamping module, a bottom water simulating module, a confining pressure module, a return pressure module, a measuring module, a microscope digital image submodule and temperature control and data acquisition module. The dynamic evaluation instrument is used for observing and evaluating coal bed methane reservoir pulverized coal generation, migration, sedimentation, blocking and the like, and capable of analyzing and observing coal bed methane reservoir pulverized coal sources and pulverized coal migration passages, quantitatively evaluating influence of pulverized coal sedimentation and blocking on reservoir permeability and reservoir production, and determining relations between draining gas recovery parameters and produced pulverized coal, and a experimental foundation is provided for pulverized coal production reduction, equipment wear rate lowering and discharging recovery optimizing. In addition, by the dynamic evaluation instrument, motion laws of pulverized coal in cores can be observed, the optimal discharging recovery under pulverized coal migration can be explored, and maximal resource utilization rate can be obtained.

The invention provides a large-scale passive nuclear plant reactor core catcher with bottom water injection and external cooling. The catcher comprises a reactor cavity coating the lower middle part of a reactor pressure vessel, and a reactor cavity concrete soleplate is formed at the bottom of the reactor cavity; a refractory layer is formed on the side surface of the reactor cavity and the bottom of the reactor cavity concrete soleplate; a steel cylinder is sleeved outside the refractory layer; an external cooling passage is formed at the bottom of the steel cylinder, and a cooling passage inlet and a cooling passage outlet are respectively formed at the two outward-extending ends of the external cooling passage; and dozens of nozzles are fixed at the bottom of the steel cylinder, and the upper ends of the nozzles extend into the reactor cavity concrete soleplate while the lower ends of the nozzles extend into the external cooling passage. According to the invention, the dilution and the temperature reduction of a melt are implemented through the melting of concrete by adopting the reactor cavity concrete soleplate as a sacrificial material. A reactor core melt is collected in the refractory layer after the reactor cavity concrete soleplate is molten through, so that the security and the reliability of a nuclear plant are further improved.

The invention relates to a method for increasing the yield of an oil gas well by controlling water pressing crack, in particular to water control pressing crack technology which takes a jelly glue system capable of automatically reducing the viscosity when encountering bottom water as a pressing crack liquid and wax-coated sand as partial supporting agent. At present, when hydraulic pressing construction is performed on low permeating bottom water oil pool, because the stress difference between layers is small or no interlayer forms the stress difference between the layers, the extending of cracks in the vertical direction can be effectively prevented, cracks formed by the hydraulic pressing crack extend and enter a water layer on the bottom in the vertical direction and jump to flow into a shaft along the cracks, and violent flooding of an oil well is generated. When pressing crack construction is carried out, the method adopts a coated supporting agent formed by mixing a thickening agent and a cross-linking agent carrying wax and quartz sand to undergo chemical degradation to coat and block so as to form a blocking layer. The method effectively solves the problems that the prior manual shielding layer cannot effectively prevent the oil well from being flooded by water, and a pressing crack liquid carrying a diversion agent or a temporary plugging agent cannot reduce viscosity basically when encountering the water and has slower settling.

The invention discloses a sewage treatment system for combined tidal flow artificial wetland, belonging to the technical field of sewage treatment. The system comprises a non-powered automatic water charging device (9), an artificial wetland bed and a non-powered automatic water discharging device (2), wherein the non-powered automatic water charging device (9) is positioned above the artificial wetland bed and is communicated with the artificial wetland bed through a siphon water inlet pipe (10); the artificial wetland bed is provided with a water discharging layer (5), a denitrification reinforcing layer (7), a reinforcing reaeration layer (8) and an aerobic ecological sand layer (17) from the bottom up; and the non power automatic water discharging device (2) and the artificial wetlandbed form a connector and are connected with each other through the bottom water discharging layer (5). The invention further discloses a sewage treatment method using the system, comprising two stepsof waterflooding absorption and emptying reaeration. Compared with the traditional combined wetland, the sewage treatment system for the combined tidal flow artificial wetland increases daily sewage treatment amount and reduces construction cost.

The invention relates to a well completion and oil production string of a horizontal well and well completion and oil production processes. In order to overcome the defect that in traditional horizontal well open hole sand-proof screening pipe well completion construction, an open hole packer at a horizontal section cannot effectively seal and separate oil and water layers because of irregular well diameter, a well completion string is fixedly arranged at the horizontal well section in an open hole well bore; a grading hoop, a casing short section, an external casing packer I, a blind plate, a casing, a layered seal tube I, an upper screening pipe, a layered seal tube II, a second casing short section, an external casing packer II, the other casing, an external casing packer III, a third casing short section, a layered seal tube III, a lower screening pipe, a wash-down valve, the lower screening pipe and a guiding shoe of the well completion string are sequentially and fixedly connected; and an acid washing string, a string for sealing up and producing oil from down, a string for sealing down and producing oil from up or a commingled production string is arranged in the well completion string. The invention has the beneficial effects that the well completion process of the horizontal well is combined with a post oil production technology, the sectioned sealing effect between the well completion string and the open hole well bore is improved, bottom water coning is delayed, and the purposes of controlling water and increasing oil are achieved.

The invention discloses a fracture-cave type carbonate reservoir waterflooding oil replacement recovery method, comprising the steps: 1, pilot flooding; in case of inadequate fracture-cave type reservoir elastic energy, pilot flooding is implemented within a cycle prior to normal waterflooding to determine well positions suitable for waterflooding oil replacement, and then waterflooding speed is determined according to the type of a reservoir body; 2, a proper amount of high specific gravity liquid having larger specific gravity than crude oil and insoluble with the crude oil is injected into the reservoir in order to fill in formation voidages and restore formation pressure; 3, well closing, replacement of the oil and the high specific gravity liquid is implemented by means of gravitational differentiation of the oil and the high specific gravity liquid, and the high specific gravity liquid sinks to the lower part of the reservoir body to form secondary bottom water, thereby driving oil upwards and lifting oil-water interface; and 4, well is opened for oil recovery when wellhead pressure is recovered to basically stable level. According to the invention, the replacement of crude oil and oilfield sewage is implemented by injecting the high specific gravity liquid insoluble with crude oil, such as the oilfield sewage, into oil well, and the crude oil and the oilfield sewage are converged at the upper part of fracture cavity or at the bottom of higher well in order to achieve oil recovery once again.

The invention discloses a coal bed gas reservoir layering co-mining high temperature and high pressure discharging mining dynamic evaluation instrument. The coal bed gas reservoir layering co-mining high temperature and high pressure discharging mining dynamic evaluation instrument comprises a displacement module, a core clamping module, a bottom water analog module, a surround pressure module, a return pressure module, a vacuum pumping module, a measuring module and a temperature control and data collecting module. The coal bed gas reservoir layering co-mining high temperature and high pressure discharging mining dynamic evaluation instrument is particularly used for evaluating influence of critical desorption pressure, reservoir differential pressure, permeability differences and feed liquid capacity differences I respective reservoir on discharging mining parameters in coal bed gas layering co-mining, explores an optimal discharging mining system in layering co-mining technology to improve using degrees of all layering, increases gas output per well, eliminates influence of interference between layers on production, achieves reasonable, long and efficient development, improves recovery efficiency of coal bed gas, and promotes development of mining technology of the coal bed gas.

The invention relates to a method for smelting the high-nitrogen steel by pressurizing an electroslag furnace. The method comprises the following steps that: the content and the weight percentage of each raw material of a self-consuming combined electrode parent metal are determined; the self-consuming electrode parent metal is smelted, an alloy pipe after charged with nitro-alloy particles and a deoxidizing agent is welded on the parent metal to produce the self-consuming combined electrode which is welded on a fake electrode and is clamped on the electrode; an arc starting agent is placed into a bottom water tank below the self-consuming electrode; the slag is dried for three to ten hours and is poured into a crystal device, a smelting chamber is sealed; under the condition of nitrogen, the slag is melted with a current ranging from 1000 to 2000A; afterwards, the pressure of the smelting chamber and the cooling water are increased to be 3 to 10 MPa, the smelting is performed with a current ranging from 2000 to 6000A; when the smelting current is reduced to 1000 A, the smelting is over. The method has the advantages that the solid state arc starting slagging way and the self-consuming combined electrode are adopted to perform the smelting in an over-normal pressure sealing smelting chamber, and the problem of the prior art of uneven distribution of nitrogen in the process of preparing high-nitrogen steel is solved, thereby avoiding the remelting and saving the production cost; moreover, the technique method is simple and the smelting effect is good.

The invention provides a method work-out the bottom water cone advancing height, cone advancing radius and water cone volume according to the bottom water cone predicted model, researches the water submerging degree and residue oil latent capacity with the water cone shape, and the oil wells are classified according to the water containing rising rule, researches the change rule of the water capacity in oil; determines a bottom water treatment rule and solves flowing nine problems: 1. oil well type classification; 2. reservoir submerged degree estimation; 3. residue oil latent capacity analysis; 4. the selecting rule of bottom water treating method; 5. the selecting condition of bottom water treating well; 6. the decided rule of the isolating board in manual isolating board method; 7. creates the sifting standard and the assembly rule of blocking and sealing agent for isolating board; 8. creates the design method of the blocking agent quantity; 9. the effect estimation and the economic efficiency prediction of the bottom water treatment.

The invention discloses a dynamic physical simulation experiment method for water invasion of a fractured gas reservoir with bottom water and a device thereof; the device comprises a rock core holder including a holder cylinder, a rubber sleeve, an accommodating chamber, and annular confining pressure space; a fractured rock sample is disposed in the accommodating chamber; a high-pressure injection pump is communicated with the confining pressure space of the rock core holder through a first hollow pipe, and a first switch valve is disposed on the first hollow pipe; a gas feeding container and a water feeding container which are arranged in parallel are connected with an inlet end of the rock core holder; a second switch valve is disposed between the gas feeding container and a second hollow pipe; a third switch valve is disposed between the water feeding container and a second hollow pipe; a gas-water separator and a gas flowmeter are arranged in series; the gas-water separator is connected with an outlet end of the rock core holder; a fourth switch valve is disposed on a third hollow pipe. The invention can realize dynamic simulation research for water invasion of fractured gas reservoir with bottom water in a laboratory, and has the advantages of accurate test data, simple device, and easy operation.

The invention discloses a production-increasing method by water-plugging and fracture, comprising the following steps: mixing 5 to 7 proportions of crack shielding agents with 100 proportions of clean water; injecting a mixture a into pressed cracks of a well layer under the temperature of 0 to 45 DEG C; shielding an aperture in a storage layer; mixing 5 to 10 proportions of bottom water oil reservoir plugging agent with 100 proportions of low-viscosity fracturing fluid; injecting the mixture generated in step c into cracks pressed in oil layer or gas layer under the temperature of 0 to 45 DEG C; plugging lower water layer after deposition of the mixture; carrying out sand-adding and fracturing operation on the oil layer or the gas layer at the upper part of the storage layer; closing a well and waiting for condensation then fishing the construction. In the method, the bottom water oil reservoir type or the bottom water gas reservoir type gas well bottom is plugged, the jumping-up of bottom water is prevented, simultaneously the crack height is controlled effectively, the extending-down of the crack is prevented, therefore, the aims of plugging the water layer is achieved and the single-well output of an oil well or a gas well is improved.

The invention relates to an anoxic-aerobic vertical flow artificial wetland system which comprises a wetland tank body, an aerating device, a water inlet pipe, a drain pipe, a water outflow reflux device and wetland plants. The aerating device is arranged on the upper and middle portion of a vertical flow wetland, so that the lower portion of the wetland is maintained in an anoxic state, and an aerobic zone and an anoxic zone which are required for nitrification and denitrification reactions are simultaneously formed in the vertical flow artificial wetland system. When the anoxic-aerobic vertical flow artificial wetland system runs, raw sewage first enters the vertical flow wetland tank body through the bottom water inlet pipe and a water inlet pump and passes through the anoxic zone at the bottom of the tank body, an adequate carbon source in the sewage is utilized to perform the denitrification reaction; and then the sewage enters the aerobic zone which is positioned in the middle of the tank body and provided with the aerating device, and after aeration oxygenation nitrification reaction treatment and combined action of plant root systems, finally the purified sewage is discharged out of the wetland tank body through the drain pipe on the upper portion. The artificial wetland can effectively remove pollutants, and the denitrification effect is greatly improved.

The invention relates to a fracture-cave carbonate reservoir physical model and a displacement simulation experimental device and system. The fracture-cave carbonate reservoir physical model comprises caves, fractures, a base plate and a filler, wherein the caves and the fractures are arranged on the base plate and connected into a whole; the filler is used for simulating the cave filling conditions; and the fracture-cave carbonate reservoir physical model is provided with a filler opening, a withdrawal opening and a bottom water opening. The fracture-cave reservoir visual displacement experimental device is more approximate to an actual reservoir model, particularly for cave and fracture-cave reservoirs, can simulate the discrete distribution feature of the fractures and caves, and is more practical for simulation of filled caves. In addition, owing to the detachability of the fracture-cave model, the operability and the flexibility of experiments are enhanced; the model setting, adjusting and maintaining periods are shortened; the model is simple in manufacture process and can be repeatedly used; and therefore, the experiment cost is greatly lowered.

The invention discloses an intelligent on-vehicle mobile type phase-change heat storage and supply system. The system comprises a tractor and a phase-change heat storage and exchange device, wherein the phase-change heat storage and exchange device is fixedly arranged on the tractor, and comprises a box body; a box body water temperature gauge and a phase-change heat storage material temperature gauge are arranged on the back wall of the box body; a heating pipe group, a cold water inlet pipe, a phase-change heat storage component and a hot water outlet pipe are arranged in the box body in turn from bottom to top; and a bottom water outlet of the box body and the hot water outlet pipe on the upper part of the box body are connected to a same water main through pipelines. The intelligent on-vehicle mobile type phase-change heat storage and supply system provides hot water supply and heating services for heat energy users by using residual heat or waste heat discharged in the form of steam by high energy consumption units such as heat power plants, iron and steel works and the like, and has the characteristics of simple and compact integral structure, high space utilization ratio, high energy storage density, high heat exchange efficiency, intelligent control, stable, safe and reliable operation, convenience for maintenance and operation management and the like.

The invention provides a water body energy three-dimensional physical simulation device and a method of a bottom water reservoir. The water body energy three-dimensional physical simulation device of the bottom water reservoir comprises a model body, a water body middle container, a gas middle container, a displacement pump, a high-pressure gas cylinder, a first six-way valve and a second six-way valve, wherein the displacement pump, the high-pressure gas cylinder, the top end of the water body middle container and the top end and the bottom end of the gas middle container are respectively connected with one valve of the first six-way valve; the bottom end of the water body middle container is connected to the bottom of the model body through the second six-way valve; the displacement pump is used for pumping an external water body into the water body middle container through the first six-way valve; the high-pressure gas cylinder is used for injecting external gas into the gas middle container through the first six-way valve; and the model body is used for accommodating a bottom water oil layer to simulate the bottom water reservoir. The device largely reduces the volume of three-dimensional physical simulation equipment; and the used equipment is simple, and is easy to operate, so that the water body energy three-dimensional physical simulation of the bottom water reservoir can be realized indoors.

The invention discloses a floating body impeller type surge machine which comprises a motor, a gear box connected with the motor, and a floating body impeller connected with the gear box. The floating body impeller type surge machine is characterized in that the floating body impeller comprises an annular floating body, and a plurality of blades are arranged on the outer side below the annular floating body. The invention can ensure that bottom water in a pool is lifted to the surface of the pool at low velocity and large flow during the work, a large range of waves are formed while a water body is subjected to oxygenation under the action of the blades of the floating body impeller, and disperse along the surface without blockage, thus the oxygenation of the bottom water is promoted and the harmless speed of harmful substances is increased.

The invention relates to an automatic universal tank-washing device for cleaning the insides of railway tank wagons, automobile transportation tank wagons and similar storage tanks or fixed containers, in particular to a multi-functional automatic universal tank-washing device which is used for washing the complete internal surface of a tank by a water column (sprayed from a nozzle) after circularly flowing a cycle through hydraulic drive and mechanical drive, belonging to the technical field of railway equipment. The device provided by the invention is used for washing the complete internal surface of the tank by the water column (sprayed from a nozzle) after circularly flowing a cycle through hydraulic drive and mechanical drive. The device is characterized in that after a washing water column horizontally rotates a cycle, a nozzle automatically rotates a certain angle so as to change the only upper / lower washing positions on a vertical surface, and after carrying out multi-cycle horizontal rotation, the nozzle rotates a cycle along the vertical surface. A water inlet pipeline, a water outlet pipeline and a bottom water absorption pipeline are concentrically fixed on a manhole fixed seat, therefore, the device is convenient to install and remove.

The invention discloses a bottom water plugging agent system and process for a horizontal well. The bottom water plugging agent system for the conventional horizontal well is characterized by comprising an inorganic precipitation type system and a polysilicon system or polymer gel system.The bottom water plugging agent system for the thermal-recovery horizontal well is characterized by comprising an inorganic precipitation type system and a N2 foam system or temperature-sensitive gel system. The bottom water plugging agent process for the horizontal well comprise the following steps: (1) injecting an annular chemical plugging device by using a mechanical packer plugging device on the basis of clarifying a water outlet point so as to ensure the selectivity of the injection; (2) selecting the bottom water plugging agent system according to the temperature, the heterogeneity and other parameters of the oil reservoir at the horizontal well; and (3) injecting the bottom water plugging agent system. The bottom water plugging agent system is selected reasonably and combined properly. The technology of the bottom water plugging agent process can be applied to the horizontal well with high or ultrahigh water content to achieve the purpose of deeply plugging more than 90% of bottom water at high strength, so that the water content of the horizontal well is reduced effectively, and the productivity of the oil well is improved.

The invention provides a wastewater recycling process in coupling dye production. The process comprises the steps of treating a large amount of mother solution wastewater and washing wastewater produced during dye production for washing of filter cakes. By using the wastewater recycling process, on the whole processes of dye filter cake production, only bottom water and ice for coupling are newly increased sewage sources; the dye filter cakes are washed by recycled sewage after oxidation treatment, so sewage drainage can be reduced by more than 80 percent in comparison with the prior art; and indexes such as intensity, chromatic light and the like of dye washed by recycled wastewater are approximate to the indexes of the dye washed by tap water.

The invention relates to a three-dimensional simulation device for an edge / bottom water reservoir. The device comprises a body and a detachable moving side wall which is arranged on the side surface of the body, wherein an accommodating cavity is formed in the body; a gland is arranged on the top of the body; a piston is arranged on the lower part of the gland; a plurality of vent holes communicated with the accommodating cavity are formed in the gland; an annular groove in which a clapboard can be arranged in a sealing mode is formed in the peripheral side wall of the accommodating cavity; a plurality of poroid functional measuring points are formed on all the wall surfaces of the body and the gland and are communicated with the accommodating cavity in a controlled mode; a plurality of granular porous media are fully filled in the accommodating cavity; and a plurality of pipe columns for simulating a mineshaft are arranged in the granular porous media in the accommodating cavity. By the device, edge / bottom water reservoirs which have different thicknesses and are developed at different dip angles in different displacement modes and different well pattern types can be subjected to physical simulation experiment, so that an oil-water percolation mechanism of an oil and gas reservoir can be researched, and the effects of the edge / bottom water reservoirs in different development modes can be evaluated.

The invention discloses a bottom water filtering system and further discloses an imitated ecological recirculating aquaculture and propagation system and a method for promoting natural propagation of migratory fish by adopting the recirculating aquaculture and propagation system. By adopting the method and establishing the recirculating aquaculture and propagation system suitable for integrated growth, development and spawning of the migratory fish, breeding and propagation functions are effectively integrated, and synergic regulation of ecological factors which are necessary during maturation of the migratory fish, especially reeves shad is optimized, so that sexual glands of bred parent fish can synchronously develop and mature under the appropriate, coordinative and controllable ecological conditions, the parent fish can naturally spawn without artificial spawning, and injuries, deaths and gonad development interference caused by hormone injection and catching operation are avoided. The method for promoting the natural propagation of the migratory fish by adopting the recirculating aquaculture and propagation system is simple, reliable and effective and is the key for propagation technology industrialization of the migratory fish, especially the America reeves shad.

The invention relates to the field of oil-gas field development, in particular to a large bottom water sandstone oil reservoir development physical simulation experiment device and a working method thereof. A model body is used for constructing an oil layer and a water layer, a bottom water system is used for simulating bottom water energy, the model body is connected with a resistivity meter, and the resistivity meter is connected with a data processing system; an injection system is connected with the model body and used for injecting water or chemical agents for well stimulation into the model body; a mining system is connected with the model body and used for controlling the mining pressure and speed; the data processing system is further connected with the injection system and the mining system separately, monitors changes of a pressure field and a saturation field in real time and controls the mining system. According to the large bottom water sandstone oil reservoir development physical simulation experiment device and the working method thereof, oil and water distribution and pressure distribution of a large bottom water sandstone oil reservoir in the natural energy mining process, the water injection mining process and the well stimulation mining process can be simulated, and a reliable physical simulation model and method are provided for study of the seepage law and the well stimulation effect of the large bottom water sandstone oil reservoir.

The invention discloses a subsection well completion system of a bottom water reservoir horizontal well, in particular to a special well completion system for a horizontal well, belonging to the field of petroleum drilling well completion. The invention aims to provide a well completion system for reducing the pressure drop rate, stabling oil, controlling water, preventing sand, blocking water, improving the oil extraction rate and reducing the well completion expense. A release joint at the root end of the horizontal well is connected with a first section of novel flow-controlling sieve tube; a novel flow-controlling sieve tube section and a casing section are alternated; a packer is arranged between the novel flow-controlling sieve tube section and the casing section; a safe joint is arranged behind a first sieve tube of the novel flow-controlling sieve tube section; a plug is arranged at the tail end of a well completion tubular column; and spring centralizers keep away from the packer and are arranged on the whole well completion tubular column at equal interval. The key part is the novel flow-controlling sieve tube. The technical scheme has the essential points that subsection well completion is implemented on the bottom water-oil reservoir according to the oil reservoir characteristics and a borehole track. The invention has the characteristics of reducing pressure, stabilizing oil, controlling water, preventing sand, improving the recovery ratio and having high economic performance and is applicable for well completion of the bottom water reservoir horizontal well.

The invention discloses a flexible high-efficiency automatic spray-coating system of a big wheel tractor chassis. The system comprises a spray-coating robot system, a mixed gas spray-coating system, a top-supply and bottom-water-absorption rotary paint spraying room, a wide push rod underslung power and free chain and a control system. During spray-coating operation, the top-supply and bottom-water-absorption rotary paint spraying room can ensure an appropriate working environment of a spray-coating robot; the wide push rod underslung power and free chain is used for conveying parts of the big wheel tractor chassis to the spray-coating robot and tracking and interlocking the big wheel tractor chassis; and an automatic mixed gas spray gun at the front end of an arm of the spray-coating robot moves according to the demonstrating track and optimized process parameters and works together with the robot to complete the spray-coating work. The flexible high-efficient automatic spray-coating system of the big wheel tractor chassis has the advantages of intelligence, high efficiency, low pollution and high coating utilization rate, can ensure the consistency of the spray-coating operation and can flexibly change the spray-coating track according to different workpieces.

The invention provides an O-shaped well physical simulation experiment device. The experiment device comprises a fluid feeding system, an oil reservoir simulation system, a data acquisition system and an output liquid metering system. Accurate simulation of O-shaped well circular supply boundary is realized by using a cylindrical box body; by using a hydraulic top cover, compacting effect is improved and permeability of a sand-packed model is reduced; internal pressure distribution data of the sand-packed model can be acquired in real time by using a set of pressure monitoring systems comprising a plurality of pressure transducers; experiment automaticity is raised by using a data acquisition and processing system; O-shaped well flooding well network simulation is realized by arranging a water injection well borehole at a central section of the sand-packed model; and bottom water reservoir simulation is realized by arranging a water injection hole at bottom of the sand-packed model, thereby a new research platform is provided for O-shaped well oil and gas field exploitation mechanism and application researches.

The invention belongs to the petroleum and natural gas development technical field and discloses an edge water gas reservoir water breakthrough time prediction method. The method includes the following steps that: edge water gas reservoir geological data and analysis test data are obtained; a three-dimensional geological model under combination modes of four kinds of heterogeneous reservoir stratums is established, and a gas area and an edge water area of an edge water gas reservoir are divided, and a virtual well is established in the gas area of the edge water gas reservoir; and the gas well water breakthrough time of the edge water gas reservoir under the combination modes of the different kinds of heterogeneous reservoir stratums can be accurately predicted through using response relationships between the gas well water breakthrough time and the heterogeneous feature parameters of the reservoir stratums. The method can be used for guiding the adjustment of gas reservoir development work systems. With the method adopted, the output of a well which is to be subject to water breakthrough can be decreased timely, and production pressure difference can be controlled; the advance speed of edge-bottom water can be effectively slowed down; and therefore, technical support can be provided for long-term stability of edge water gas reservoirs.