163results about How to "Reduce water output" patented technology

The invention relates to a plugging removal and stimulation method for a low permeability oil well. The ultra-low resistance acid-type microemulsion is prepared by the following components: 10%-25% of acid, 5%-20% of oil, 5%-25% of alcohol, 0.5%-5% of surfactant, 0.5%-3% of inorganic salt, 0.3-1.5% of corrosion inhibitor and the balance water. The method comprises the following steps: injecting the prepared microemulsion in the oil bearing reservoir of the oil well, closing the oil well to react for 4-10h, cleaning the oil well, flowing the reaction exhaust liquor back, and completing the oilwell to perform normal production. The ultra-low resistance acid-type microemulsion used by the invention has thermodynamic stability, is a high dispersive acid-type microemulsion with good solubilization capacity, has ultra-low surface and interfacial tensions and good solubilization capacity and can increase the dispersive capacity of crude in water and the emulsification and peeling function to oil film; the microemulsion also has good dissolubility in water or oil and good fluidity due to high carrying capability and low seepage resistances so that the oil yield of the oil well is increased and the water content is reduced; the liquid surface tension in oil reservoir is reduced and the flow resistance of the crude is lowered so that the mining rate of the crude is increased and the plugging removal and stimulation of the oil well can be realized.

The invention relates to a novel non-pressure irrigation rig. The water outlet valve of a water supply tank is opened, irrigation water flows into a water level control tank, when the water level of the tank is higher than h1, an intake tube is submerged, air suction is changed into water inflow until the water level in the intake tube is equal to the water level in the water supply tank, the irrigation water does not flow into the water level control tank, the water level of the tank is stabilized at the water level slightly higher than h1, the irrigation water enters into a filling area at the upper part in a U-shaped slot by virtue of a permeable cover plate and a sand inverted filter from the bottom in the U-shaped slot of the irrigator, a soil saturation water layer which is at the same height of the water level of the water level control tank and is lower than the upper edge of the U-shaped slot, water of the saturation water layer rises to the root layer of a crop in a capillary water way, a crop consumes water to cause the water level of the water level control tank to be lower than h1, the intake tube comes out of water surface, air is sucked in air bubbles, the irrigation water flows into the water level control tank, the water level rises to submerge the intake tube again, the crop consumes the water to cause the water supply process to be repeated, the output of supplying water is increased or reduced along with water consumption, irrigation is adaptive, and the irrigation rig is simple to operate and is convenient to use.

The invention discloses a film-coated modified propping agent, and a preparation method and an application thereof. The film-coated modified propping agent is composed of a matrix and a resin layer uniformly coated out of the matrix, wherein the matrix is Hobq quartz sand; the resin layer is 1-10 wt% based on that of the matrix; and the resin layer comprises a resin binder and a curing agent, wherein the resin binder is bisphenol A epoxy resin, polyurethane resin or a combination thereof, the curing agent is an aliphatic polyamine curing agent an oralicyclic amine curing agent, and the usage amount of the curing agent is 10-50 wt% based on that of the resin layer. The preparation method of the film-coated modified propping agent is that the resin layer is coated on the outer surface of the matrix. The film-coated modified propping agent can be applied in fields of fracturing exploitation of oil and gas wells, is helpful to increase sand ratio and reduce usage amount of fracturing liquid, can effectively prevent backflow phenomenon, alleviates insertion of the propping agent, increases crack diversion capability, prolongs fracturing validity period, is helpful to increase oil output, reduces water yield and has significant meaning for solving the exploitation of low permeability oil field.

The invention relates to a kitchen sink, in particular to a self-cleaning type water-saving anti-blocking sink. The sink comprises a sink body and a water discharging pipe; a water distributor is serially connected between the sink body and the water discharging pipe; the water distributor comprises a cylindrical shell, a water seal mounted at the upper part of the cylindrical shell, a conical filter net mounted in the center of the lower part of the conical shell, and a power apparatus for driving the conical filter net to rotate; the water discharging pipe is arranged in the bottom center of the cylindrical shell; a scraping plate in contact with the outer wall of the conical filter net is arranged on the inner wall of the cylindrical shell; a residue discharging hole is formed in the upper end part of the scraping plate; the power apparatus comprises a centrifugal pump; a rotary shaft of the centrifugal pump penetrates through the water discharging pipe and is fixed with a rotary shaft of the conical filter net; a tangential hole of the centrifugal pump serves as a water inlet; an axial hole of the centrifugal pump serves as a water outlet and is connected with a tap; a hairbrush in contact with the conical filter net is arranged on the inner side of the conical filter net; and the hairbrush is fixed at the bottom of the cylindrical shell. The sink adopting the technical scheme is good in anti-blocking effect, can be automatically cleaned, and has a water-saving effect.

The invention relates to a solar-energy translation type sprinkling machine comprising a main rack body. The main rack body is formed by a master beam and a rack arranged under the master beam, wherein a walking mechanism is arranged under the rack; water pipes are fixed on the master beam; two sides of the master beam are respectively provided with a suspension arm mechanism horizontally extending outward; each suspension arm mechanism is fixed via a traction rope; a water outlet end of each water pipe extends along the suspension arm mechanisms on two sides via branching and connected with a plurality of water spraying devices on the lower ends of the suspension arm mechanisms respectively; one side of each suspension arm mechanism is fixedly connected with a balance universal wheel via a first telescopic support and the other side is connected with a second telescopic support; and the second telescopic support is connected with a bearing groove. The sprinkling machine is advantaged by energy conservation, high efficiency, convenient use, great balance property and crop rolling resistance.

A treatment method of mercury-containing wastewater comprises the following steps: a) adjusting the pH value of wastewater to be treated to 7; b) enabling the mercury-containing wastewater to flow automatically in a reactor, and pouring a vulcanizing agent and a composite additive in the reactor according to a ratio to ensure that the Hg in the wastewater is converted to HgS precipitate particles; c) leading the supernatant of the wastewater to enter a water-storing lifting tank and then entering a separator through a lift pump to realize the separation of particles and water; and d) enabling the composite additive to be used to fix the vulcanizing agent and to be recycled in the system, and when the content of mercury in the precipitate particles reaches 3-5%, the precipitate particles are discharged into a slag-storing tank for recycling. The invention adopts the chemical method to convert Hg directly to water-insoluble HgS precipitates, a coagulant and an organic flocculant are not required to be added and the mercury-removing medicament can be recycled in the system, thus the treatment cost can be reduced and new pollutants can not be generated in the treatment process. The method is suitable for both high concentration mercury-containing wastewater and low concentration mercury-containing wastewater.

The invention provides a slack coal pressure gasification wastewater treatment method and treatment system as well as application. The treatment method sequentially comprises the following steps of: (1) performing coagulating sedimentation on the wastewater to obtain wastewater after the coagulating sedimentation treatment; (2) performing chemical catalysis on the wastewater obtained by the step (1) to obtain wastewater after the catalytic oxidation treatment; (3) performing aeration biofiltration on the wastewater obtained by the step (2) to obtain wastewater after the aeration biofiltration treatment; and (4) performing membrane separation on the wastewater obtained by the step (3) to obtain dischargeable / recyclable water.

The invention discloses a compound acid blockage removing fluid. The blockage removing fluid is prepared from raw materials in parts by weight as follows: 4-6 parts of a foam flushing fluid, 20-30 parts of a prepad fluid, 70-100 parts of main acid and 10-20 parts of postpad fluid. The acid fluid has higher capacity of removing organic sediment pollution and high acid residue and emulsifying resistance. The acid fluid has low corrosion speed and good swelling inhibition and does not change the original water wetting characteristic of the stratum.

The invention discloses a preparation method of a propping agent coated with a superhydrophobic polymeric membrane. The preparation method is characterized by comprising the steps that an organosilicone precursor and alcohol are mixed, the pH value is regulated to be 12-13 through alkali liquor, reacting is conducted for 0.5-5 h at the temperature of 30 DEG C to 70 DEG C, and then fluorosilane is added for reacting; liquor obtained after reacting and linear resin are mixed, and the temperature of the mixed liquor is increased to 70 DEG C to 100 DEG C; a curing agent is added, after the mixed liquor and a propping agent are mixed to be cured for 1-3 h at the temperature of 90 DEG C to 120 DEG C, curing is conducted for 1-3 h by increasing the temperature to 150 DEG C to 200 DEG C, and then the propping agent coated with the superhydrophobic polymeric membrane is prepared. According to the preparation method, the contact angle between the surface of the prepared polymeric membrane and water is larger than 150 degrees, the hydrophobicity of the surface of the propping agent can be greatly improved, the propping agent modified with the polymeric membrane serves as a key material of a hydrofracture technique, the exploitation quality of shale oil and gas can be improved, the exploitation yield of the shale oil and gas can be increased, and the practicability is high.

This invention relates to a rapid-curing thermosetting phenol formaldehyde resin, whose raw materials comprise: phenol formaldehyde resin solution 90.9-99.5 wt. % and urotropine 0.5-9.1 wt. %. The resin can be dried at a low temperature for producing glass fiber pre-soaking cloth. The pre-soaking cloth is resistant to damp and cohesion, and easy for usage. The pre-soaking cloth can be used to produce fishing rods, and the process has shorter curing time (from 3 h to 1-2.5 h), thus saving energy and using few molds. Since the addition of urotropine can reduce the water leakage, it can be directly increased to the drying temperature without a low temperature transition to obtain the pre-soaking cloth without bubbles or gel flow, or surface pores.

The invention relates to a high overflow type drawing hot water tank. The high overflow type drawing hot water tank which comprises a water tank and a hot water circulating device which supplies hot water to the water tank is characterized in that: one end of the water tank is a wire inlet end, and the other end of the water tank is a wire outlet end; an upper cover is arranged on the water tank; places of the upper cover, which correspond with the wire inlet end and the wire outlet end respectively, are respectively provided with an upper baffle; the hot water circulating device comprises a front sink arranged on the wire inlet end, a rear sink arranged on the wire outlet end, an auxiliary water tank with a heating device, and a hot water pump; water outlets of the front sink and the rear sink are communicated with the auxiliary water tank through pipelines; the water inlet end of the hot water pump is communicated with the auxiliary water tank through a pipeline; and the water outlet end of the hot water pump is communicated with the water tank through a pipeline. The high overflow type drawing hot water tank of the invention, which allows the water outlet volume to be reduced and the water level to be risen through the upper baffles on the wire inlet end and the wire outlet end, allows wires in the hot water to be always heated and drawn, a good heating effect to be possessed and energy consumption to be substantially reduced.

The invention relates to a water-saving agricultural irrigation device convenient to adjust. The device comprises a base, wherein rollers are arranged at the bottom of the base; a groove is formed inthe base; a mounting seat, a first outer cylinder and a slide rail are fixed in the groove; a water storage tank and a water pump are fixed on the mounting seat; first sliders matched with the slide rail are arranged on the slide rails; fixing bolts are arranged on the first sliders; an electric telescopic rod and a second outer cylinder are fixed on the first sliders respectively; a platform is fixed at an end part of the rod body of the electric telescopic rod and fixed with a mounting plate through a support rod; slide plates are fixed on two sides of the mounting plate; slide grooves are formed in the slide plates; second sliders matched with the slide grooves are arranged in the slide groove; adjusting inner cylinders are arranged in the first outer cylinder and the second outer cylinder, and mounting grooves are formed in the side surfaces of the adjusting inner cylinders. According to the technical scheme, the defects that irrigation height cannot be adjusted and irrigation water outlet density cannot be adjusted according to different water demanding degrees of crops in the prior art can be effectively overcome.

The invention provides an oil and water selective self-expansion rubber plugging agent for a fractured-vuggy reservoir as well as a preparation method and an application of the rubber plugging agent and belongs to the field of functional polymer materials. The rubber plugging agent has the performance characteristics such as high mechanical strength, high mineralization resistance, high toughness,high volume expansion rate, no separation, autohesion and the like. The rubber plugging agent is prepared from raw materials in parts by weight as follows: 100 parts of nitrile butadiene rubber, 50-110 parts of water-absorbent resin, 5-15 parts of oil swelling resin, 15-30 parts of a reinforcing agent, 0.5-2 parts of a softening agent, 2-5 parts of an accelerant, 3-6 parts of zinc oxide and 0.5-3.5 parts of a vulcanizing agent. The rubber plugging agent can be applied to deep plugging of high-temperature, high-salt and highly-mineralized fractured-vuggy carbonate reservoirs.

The invention relates to an oil well filling packer particle precipitation and oil increasing method for crack-type oil and gas reservoirs. The method comprises the following steps: (1) injecting filling liquid carrying packer particles into a wellbore and cracks by virtue of a wellhead until reaching or exceeding the formation fracture / fracture extension pressure, or until reaching zero injectionvolume per unit injection pressure, or until reaching a preset packer particle filling volume; (2) putting into production. According to the oil well filling packer particle precipitation and oil increasing method for the crack-type oil and gas reservoirs, the problem of channeling water in various types of cracks can be effectively solved by directly filling and stoping filling the cracks, filling an annular space and filling from a water injection well to a production well, and in particular, the two-pressure-stage pressurized filling way and stoping filling way are adopted, so that the packer particles smoothly enter the gapless cracks, the sealing effect of the cracks is effectively improved, the guiding capability of various cracks can be reduced, and the water output of the wells isreduced; meanwhile, the pressure gradient during the matrix production is further improved, the utilization degree of matrix oil and gas is improved, and the recovery ratio is improved.

The invention provides a fire-flooding well self-degradable temporary plugging agent and a preparation method and an application thereof. By metering the total weight of the self-degradable temporaryplugging agent is 100%, the raw materials for preparing the self-degradable temporary plugging agent include: 0.3-0.8% of a main agent; 0.01-0.05% of a cross-linking agent; 0.5-2% of oil-solubility resin; 0.2-0.6% of fiber particles; 0.02-0.1% of a heat stabilizer; 0.1-0.5% of a fungicide; 0.2-0.6% of a cleanup additive; 1-3% of a fluid loss reducer; 0.001-0.004% of a slow release gel breaker, andthe balance of water. The fire-flooding well self-degradable temporary plugging agent has the characteristics of good pumping property, temperature resistance, simple preparation, and low cost, and the gel breaking time is adjustable, the sealing ability is strong, and the self-degradable temporary plugging agent is suitable for wide oil reservoir types, and is not easy to pollute the stratum andcan enter a deep part of the stratum, which can effectively solve the production problem of large gas production amount of the fire-flooding wells.

The invention discloses a grouting, pipe fixing and plugging technique for a deep drainage hole wall in a water inrush borehole. Drainage and pressure relief are conducted on water outlet of a deep water-bearing stratum in a hole by placing a small-diameter drainage pipe 8 into a deep portion of an orifice pipe 7. Grouting is conducted on the interior of the hole through the hole wall of an original hole. The technique specifically comprises the following steps that (1) the small-diameter drainage pipe 8 is placed in the hole; (2) a hole wall grouting device 6 is installed at the orifice, and the hole wall grouting device 6 comprises a grouting pulp inlet brake valve 1, a pulp pipe 2, a hole wall brake valve 3 and a pressure release valve 5; (3) a drainage orifice brake valve 4 is installed at the orifice; (4) pulp is injected into the hole through the hole wall by means of the hole wall grouting device 6 and the pulp pipe 2, and the pulp comprises aggregates and cement paste; and (5) after a water outlet crack channel of a roadway floor is blocked, the water-bearing stratum is subjected to grouting through the drainage orifice brake valve 4. By the adoption of the technique, the problem that a large amount of water in the hole gushes out from a shallow bottom slab of a surrounding roadway for pressure relief, when a conventional orifice direct grouting method is used, a large amount of pulp gushes out from water bursting points of the shallow bottom slab of the surrounding roadway, and consequentially the drill hole cannot be plugged is solved.

A water level signal device for a high-position pool comprises a water pumping pipe 9, the high-position pool 5 and a water pump 2, wherein a water outlet is formed in one end of the water pumping pipe 9, a water inlet is formed in the other end of the water pumping pipe 9, the water outlet of the water pumping pipe 9 is communicated with the high-position pool 5, the water inlet of the water pumping pipe 9 is communicated with a water outlet of the water pump 2, and an electromagnetic flowmeter 3 and a float valve 4 are arranged on the water pumping pipe 9. The electromagnetic flowmeter 3 is arranged close to the water inlet of the water pumping pipe 9, and the float valve 4 is arranged close to the water outlet of the water pumping pipe 9. When water in the high-position pool 5 rises to the predetermined position, a floating ball drives the float valve to be closed, water outlet quantity of the water outlet of the water pumping pipe decreases, and flow velocity measured by the electromagnetic flowmeter decreases. Therefore, whether water in the high-position pool rises to the predetermined position can be judged according to changes of water flow velocity measured by the electromagnetic flowmeter 3 at a water pumping control point at a lower position, and users can stop pumping water to prevent water from overflowing out of the high-position pool. The water level signal device for the high-position pool can be matched with water level telemetering devices to find faults of the water level telemetering devices in time.

The invention relates to a vortex solidification underground water remediation system. The vortex solidification underground water remediation system is arranged in an underground water to-be-remediated area, and comprises a pumping well, water injection wells and fences. The pumping well is formed in the center of the to-be-remediated area, the multiple water injection wells are arranged at intervals along the outer contour line of the to-be-remediated area, an inorganic inert adsorption material is injected into the water injection wells, and the closed adsorption material fences are formedon the outer side of the to-be-remediated area, wherein the adsorption material fences have good water permeability, and the height of the fences is at least equal to the covering depth of polluted underground water. By performing large-drawdown pumping on the pumping well and large-flow reinjection on the water injection wells, a cone of depression is formed, and after the adsorption material adsorbs pollutants in the underground water, the pollutants are degraded and solidified, gather towards the pumping well group along with the migration of the underground water and then are pumped to thesurface through the pumping well group for surface treatment and purification. The vortex solidification underground water remediation system has the advantages of small pumping amount, short cycle and large treatment range.

The invention discloses an energy saving faucet which comprises a valve body, a valve base, a valve plug, a fixed tile, a moving tile and an elastic washer. The valve body is provided with a water inlet channel and a water outlet channel. Two symmetrically limber holes are arranged on the inner wall of the extending-in end of the valve base. A limit block is arranged on the inner wall of the valve base and located on any wall between the two limber holes and deviates from the middle of any wall between the two limber holes for 15-30 degrees. When the energy saving faucet is used, the valve plug can be selectively to be rotated rightwards or leftwards when a handle is rotated, accordingly two gears with different water outlet flow in size are formed; when a large amount of water is needed (such as water receiving and containing), the handle can be pulled to the left-most side and a via hole arranged between the fixed tile and the moving tile is located at the maximum position; and when water is used for hand washing, vegetable washing, bowl washing or even washing of a small object, the handle can be pulled to the right-most side, the via hole arranged between the fixed tile and the moving tile is located at the minimum position, and therefore water saving can be effectively achieved and water resource waste is avoided.

The invention provides a method for preparing a hedysarum polybotrys extract by adopting a coupling technology. The method comprises the following steps of: carrying out heating reflux extracting on hedysarum polybotrys; adding commercially available pectinase in a water extracting solution with the temperature of 15-60 DEG C; carrying out enzymolysis and sedimentation; removing insoluble impurities to obtain an enzymolysis extracting solution; carrying out ultra-filtering on the enzymolysis extracting solution; or, directly carrying out ultra-filtering on the water extracting solution; carrying out ultra-filtering on diluted trapped fluid for 2-4 times under the same condition, i.e. diluting the trapped fluid subjected to ultra-filtering each time and then carrying out ultra-filtering on the diluted trapped fluid subjected to ultra-filtering, ensuring that the volume of the trapped fluid subjected to ultra-filtering for the last time does not exceed 20 percent of the volume of the enzymolysis extracting solution, and merging all filtrated solutions to obtain a total filtrated solution; carrying out nanofiltering and concentrating on the total filtrated solution; concentrating trapped fluid subjected to nanofiltering under reduced pressure, and drying to obtain a hedysarum polybotrys full-ingredient extract; or concentrating the trapped fluid subjected to nanofiltering to be an extracting solution with corresponding concentration for preparing liquid preparation. According to the method, the process period for preparing the hedysarum polybotrys extract can be effectively shortened, the production cost is reduced, the extract quality is improved, and environmental protection is favored.

The invention relates to a method for removing nitrogen and phosphorus from sewage. According to the method, part of inlet water of a sewage plant directly enters a denitrifying bacterium multiplication tank, after subjected to denitrifying bacterium multiplication, a mixed solution in the denitrifying bacterium multiplication tank is added into an anaerobic tank, and the effect of nitrogen removal by denitrification of the sewage plant can be remarkably improved. Meanwhile, nitrifying bacteria are added into the anaerobic tank, so that the speed of removal by denitrification of NO3-N in returned sludge by activated sludge can be accelerated, a strict anaerobic environment can be formed in the anaerobic tank, anaerobic and aerobic biological phosphorus removal of the activated sludge is facilitated, and the biological phosphorous removal effect of the sewage plant can be improved. The invention also provides special equipment for implementing the method. The special equipment comprises a grit chamber, an anaerobic tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank along a sewage flowing direction, and also comprises a denitrifying bacterium multiplication tank, wherein the denitrifying bacterium multiplication tank is communicated with a water inlet pipe of the sewage plant and the anaerobic tank.

The invention relates to the technical field of gardens, and discloses a water-saving garden watering equipment, which includes a vehicle plate, a fixed block is fixedly installed on the bottom of the vehicle plate, and self-locking casters are fixedly installed on the bottom of the fixed block. A mounting plate is fixedly installed on the top of the plate, a water storage tank is fixedly installed on the top of the mounting plate, a connection block is fixedly installed on the left side of the water storage tank, a limit ring is fixedly installed on the left side of the connection block, and the inner side of the limit ring is clipped There is a watering device, the bottom of the watering device is connected with a water pipe, the top of the vehicle plate is fixedly installed with a metal block on the right side of the installation plate, the top of the metal block is fixedly installed with a push rod, and the top of the push rod is fixedly installed with a handle , the top of the mounting plate is provided with a groove located on the left side of the water storage tank, a toolbox is movably installed at the bottom of the groove, and a fixing plate is clamped in the box of the toolbox. The water-saving garden watering equipment makes full use of effective water flow and reduces cost expenditure.

The invention provides a water-spraying recreation facility, mainly comprising a decorated gateway, a controller and a pressure boosting water pump, wherein the decorated gateway stretches across a river. According to the water-spraying recreation facility, instant turn-on or turn-off can be realized according to scene needs; moreover, a function of interacting with visitors is provided; the visual effect is good; the actual water spraying amount is low.

The invention discloses a quick measurement method of coal seam gas pressure. The method is characterized in that the measurement operation of measuring the drilling pressure is divided into two phases: the first phase is to perform the large-diameter drilling in the pressure measuring position, a bushing is put in the large-diameter drill hole, and slurry is injected in the bushing, the large-diameter drilling hole and a surrounding rock microfissure zone for compacting; and the second phase is to perform the drilling again in the bushing to form a pressure measuring hole penetrating in a coal seam, a drill rod is taken out, and the coal seam gas pressure is directly measured by an original bushing. The slurry is injected in a fissure group of a coal rock body surrounding the drilling hole, the drilling hole and the bushing under the effect of high pressure, so that the peripheral compactness of the drilling hole is improved, the emission of fissure water in a rock stratum is largely reduced, the air leakage and the water yield in the drilling hole are obviously reduced; and in particular, aiming at a soft coal measure strata, the coal seam gas pressure is quickly and accurately measured.

The invention discloses an automatic current limiting water saving mouth comprising a case, a filter screen, a piston, a pressure spring, a spring seat and a current limiting seat, wherein the current limiting seat is provided with a water path; the piston is provided with an external ring table and a water outlet cavity; an axial water inlet is connected with a water outlet cavity; the spring seat and a round hole are connected detachably; the pressure spring is arranged between the top plates of the water outlet cavity of the spring seat; the piston is in slide fit with the inner cavity of the current limiting seat and is sealed by liquid; the inner cavity wall of the current limiting seat is provided with a clamping groove; a notch snap ring is matched with the external ring table and the clamping groove; a gap is detachably arranged between the spring seat and the water outlet cavity; the filter screen is arranged on an internal ring table; the external annular plate of the current limiting seat is pitched on an external folding edge; and the current limiting seat and the filter screen are detachably connected with the case. Because of the structure, the piston moves upwards or downwards according to the pressure of water, the gap between the water outlet cavity of the piston and the barrel of the spring seat is adjudged to obtain the purpose of maintaining normal water yield amount.

The invention discloses an oil extraction method for establishing an oil permeable water stop sieve by filling fusheng sand in a horizontal well fracture, and relates to a new method for petroleum exploitation. The fusheng sand with an oil permeable and water stop function is filled in a horizontal well vertical fracture in the middle of a water injection well row and an oil extraction well row to serve as a supporting agent, so that an oil permeable and water stop sieve is formed in the middle of a water injection well and an oil extraction well, and a petroleum exploitation region is partitioned into a water injection region and an oil extraction region by the oil permeable and water stop sieve. Under the action of injection water pressure, when oil and water mixture passes through the oil permeable and water stop sieve, water is intercepted at the water injection region, and crude oil is then gathered on one side of the oil extraction region of the sieve through the sieve. After all petroleum of the water injection region completely passes through the sieve to enter the oil extraction region, the water injection pressure of the water injection region is abruptly increased, so that the sieve becomes a water permeable sieve, and the permeated water continuously pushes remaining oil at the oil extraction region to enter the oil well. By using the method, most of remaining oil of an oil field can be extracted, so that the petroleum recovery ratio is close to 100 percent.

The invention relates to a washing machine and a washing control method. The washing machine comprises a primary filter and a secondary filter, the two of which are communicated with a washing cylinder, respectively; the water outlet of the primary filter is communicated with the water inlet of the secondary filter; an adjustment system is connected to the primary filter and used for increasing the speed of water flow going into the primary filter. The washing machine has the advantages that the degrees of cleanliness of the primary filter and the secondary filter are increased, the service life of the primary filter and that of the secondary filter are prolonged, and the water purifying and water saving efficiency also can be improved.