CN115197744B - System for removing water and sand scraps from ground thickened oil and oil-water separation method thereof - Google Patents
System for removing water and sand scraps from ground thickened oil and oil-water separation method thereof Download PDFInfo
- Publication number
- CN115197744B CN115197744B CN202210738181.2A CN202210738181A CN115197744B CN 115197744 B CN115197744 B CN 115197744B CN 202210738181 A CN202210738181 A CN 202210738181A CN 115197744 B CN115197744 B CN 115197744B
- Authority
- CN
- China
- Prior art keywords
- oil
- tank
- water
- pressure
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G53/00—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G31/00—Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for
- C10G31/06—Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for by heating, cooling, or pressure treatment
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G31/00—Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for
- C10G31/10—Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for with the aid of centrifugal force
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G33/00—Dewatering or demulsification of hydrocarbon oils
- C10G33/06—Dewatering or demulsification of hydrocarbon oils with mechanical means, e.g. by filtration
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G33/00—Dewatering or demulsification of hydrocarbon oils
- C10G33/08—Controlling or regulating
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G53/00—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes
- C10G53/02—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes plural serial stages only
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/35—Arrangements for separating materials produced by the well specially adapted for separating solids
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/10—Feedstock materials
- C10G2300/1033—Oil well production fluids
Abstract
The invention relates to the technical field of liquid-liquid and solid-liquid separation, in particular to a system for removing water and sand from ground thickened oil and an oil-water separation method thereof.
Description
Technical Field
The invention relates to the technical field of liquid-liquid and solid-liquid separation, in particular to a system and an oil-water separation method for removing water and sand from thick oil on the ground, which have simple structure, can realize continuous large-pump oil-water separation and are lower in ground maintenance cost.
Background
As is well known, the oil field in China enters a high water content stage, and the oil-water separation process is a link which cannot be ignored in the petroleum resource exploitation process. Aiming at the problem of oil-water separation in the petroleum exploitation process, an oil-water separation device CN113769440A is provided according to gravity sedimentation and filtration technologies, such as Guo Jiang, an anhydrous calcium chloride layer is paved, the water adsorption capacity is limited, and the device is suitable for removing the oil-water mixed solution with low water content, low viscosity and good rheological property. Li et al propose a thick oil profit demulsification separation equipment CN210765171U, make the mode of water vaporization through electromagnetic induction heater, realize vapor and oily liquid phase's effective separation, this method has realized oil water separation, but easy petroleum coke in heater wall face, petroleum coke deposit jam transport pipeline. Zhou Guanghui and the like propose an oil-water separation device CN112891996A for petrochemical industry, which realizes oil-water separation by an adsorption principle and is suitable for oil-water mixed liquid with low viscosity and good rheological property. Cao Ansheng and the like propose an underground oil-water separation device and an oil-water separation method CN113818860A, and oil-water separation is realized by accelerating demulsification through electric pulse sedimentation, the device is difficult to maintain in the underground, once blockage occurs or parts are replaced, the ground is required to be lifted, the time consumption is long, the cost is high, the hydraulic cyclone underground oil-water separation device with power rotating blades of the patent No. CN201420393997.7 is used for separating oil from water, but the conventional oil-water separation device adopting the cyclone adopts underground separation, the underground space is limited, the maintenance is inconvenient, and moreover, the cyclone has high requirement on feeding pressure, the underground space is limited, so that the feeding pressure cannot be controlled, the stirring can only be carried out through the rotating blades to realize the purpose of rotating separation, only simple rotating separation is carried out, and the crude oil with higher viscosity and rheological property difference and larger influence of temperature is difficult to separate.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and provides a system for removing water and sand from thick oil on the ground and an oil-water separation method thereof, which have simple structure, can realize continuous large-pump oil-water separation and are arranged on the ground with lower maintenance cost.
The technical scheme adopted for solving the technical problems is as follows:
the system is characterized by comprising an oil pumping unit, a pressure stabilizing tank, an air booster, a circulating water tank, a hydraulic circulating pump, a cyclone separating tank, a heater, an oil storage tank and a sediment tank, wherein the oil pumping unit is arranged at a wellhead and connected with an oil inlet pipe of the pressure stabilizing tank through an oil pumping pipeline, an air inlet pipe of the pressure stabilizing tank is connected with the air booster, an water outlet pipe of the pressure stabilizing tank is connected with the sediment tank, an oil outlet pipe of the pressure stabilizing tank is connected with an inlet of the cyclone separating tank through a pipeline, the cyclone separating tank comprises a vortex tube, a conical centrifugal tube, a heating tube, an overflow tube and a sediment tube, an inlet of the cyclone separating tank is arranged on the side surface of the vortex tube and is in vortex connection with the vortex tube, the lower end of the vortex tube is connected with the conical centrifugal tube, the lower end of the overflow tube extends into the vortex tube and is connected with the sediment tank through the pipeline, a heating tube is sleeved outside the conical centrifugal tube, the inner wall of the heating tube is connected with the water inlet of the circulating water tank through the lower end of the heating tube, and the inlet of the cyclone separating tank is connected with the water inlet of the circulating pump through the water inlet of the heating tube.
The pressure stabilizing tank comprises an inner tank and an outer tank, wherein the inner tank is arranged in the outer tank and fixed on the outer tank, an annular cavity is arranged between the inner tank and the outer tank,
the utility model provides a steady voltage jar on be equipped with respectively and advance oil pipe, play oil pipe, intake pipe and outlet pipe, advance oil pipe establish at the middle part of steady voltage jar and with interior jar intercommunication, the intake pipe establish in advance oil pipe the top and with interior jar intercommunication of steady voltage jar, play oil pipe establish on the steady voltage jar of opposite side that corresponds with advance oil pipe and with interior jar intercommunication, go out oil pipe and be less than the height of intake pipe, go out to be equipped with the pressure-relief apopore with annular cavity intercommunication on the interior jar of oil pipe below, interior jar inside be equipped with on the water conservancy diversion hang plate and down water conservancy diversion hang plate, the upper end of last water conservancy diversion hang plate establish between intake pipe and oil pipe and be connected with interior jar wall, the lower extreme of going up the water conservancy diversion hang plate incline towards oil pipe position slope, the upper end of lower water conservancy diversion hang plate and go out on jar lateral wall between the pressure-relief apopore, the lower end of water conservancy diversion hang plate incline towards the below and be connected with interior jar lateral wall and form the water guide hole, the outer jar of annular cavity lower end on be equipped with the water pipe that communicates with annular cavity, go up the water conservancy diversion hang plate, upward be equipped with the pressure-down the water pipe that overflows.
An exhaust tower is arranged above the oil storage tank, and the gas in the oil storage tank is exhausted through the exhaust tower.
The pressure stabilizing tank is internally provided with the oil phase magnetic flap level gauge, and the internal pressure is displayed through the level gauge.
The pressure stabilizing tank is provided with a water injection pipe, the water injection pipe is communicated with the inside of the pressure stabilizing tank, the water injection pipe is provided with a control valve, and the pressure stabilizing tank is preliminarily injected with water through the water injection pipe.
The lower end of the lower diversion inclined plate is arranged at the position 1/5-1/3 below the inner tank.
The position setting of the pressure relief water outlet hole is obtained according to the formula H=P/(ρg), wherein H is the design height of the pressure relief water outlet hole, ρ is the density of water, g is the local gravity acceleration, and P is the design pressure of the pressure stabilizing tank.
A thermometer is arranged at the water outlet position at the upper end of the heating cylinder, the thermometer is connected with a controller in the heater, and the liquid outlet temperature is displayed through the thermometer to regulate the heating temperature of the heater.
The oil-water separation method of the system for removing water and sand scraps from the ground thickened oil is characterized by comprising the following steps of:
(1) Testing the curve of the dynamic viscosity of the oil-water mixture of the stratum along with the temperature change: firstly, testing a curve of the oil-water mixed hydrodynamic viscosity of a stratum which belongs to the stratum along with the change of temperature, determining the corresponding temperature X ℃ when the oil-water mixed hydrodynamic viscosity is lower than 12-25mpa.s, filling the circulating water tank with water, setting the outlet temperature of a heater to be X+2-5 ℃ according to the corresponding temperature X ℃ when the oil-water mixed hydrodynamic viscosity is lower than 12-25mpa.s, starting a hydraulic circulating pump to set the flow of Qm/h, and preheating a cyclone separating tank to be X+2-5 ℃.
(2) And (3) regulating a surge tank: injecting water into the pressure stabilizing tank to a position not lower than the lower end of the lower diversion inclined plate, sealing part of air at a position below the lower diversion inclined plate, forming a gas buffer cavity between the water surface and the lower diversion inclined plate, starting the pumping unit, extracting oil-water mixed liquid in the stratum into the pressure stabilizing tank through an oil pumping pipe and an oil inlet pipe of the pressure stabilizing tank, and allowing the oil-water mixed liquid to flow below the upper diversion inclined plate and above the lower diversion inclined plate under the action of gravity to fall above the water surface;
the method comprises the steps that with the increase of the injection liquid level of mixed liquid, gas in a buffer cavity below a lower diversion inclined plate of a pressure stabilizing tank is injected into an annular cavity of the pressure stabilizing tank through a slow pressure water outlet, an air booster is started immediately after the oil pumping machine finishes ascending oil extraction, the pressure stabilizing tank is pressurized, in the pressurizing process of the pressure stabilizing tank, the newly injected gas is accumulated at the upper part of the pressure stabilizing tank, the gas in the buffer cavity is gradually compressed, all the gas flows into the annular cavity of the pressure stabilizing tank through the slow pressure water outlet, and with the increase of injection pressure, water at the lower part of the pressure stabilizing tank is also injected into the annular cavity of the pressure stabilizing tank through the slow pressure water outlet, and is accumulated to a drain pipe at the lower end under the action of gravity; stopping pressurizing when the pumping unit descends to the lowest point and extracts the oil-water mixed liquid; the circulation is carried out, so that the pressure of the surge tank is ensured to be more than 0.58MPa after each pressurizing, the upper limit of the pressure setting is determined by the pressure-resistant degree of a pipeline, when the pressure in the surge tank is higher than 0.58MPa, the underflow valve and the overflow valve at the lower part of the surge tank are simultaneously opened, the underflow valve discharges the water in the annular cavity of the surge tank to the grit chamber, when the oil phase magnetic flap level meter shows that the liquid level at the lower end of the oil phase is reduced to the lowest level of the water injection liquid level at the lower end of the lower diversion inclined plate, the underflow valve is automatically closed, and after the overflow valve is opened, the mixed liquid of water-in-oil at the upper layer is injected into the vortex generating chamber along the tangential inlet of the cyclone separation tank in a high-speed fluid mode;
(3) And (3) regulating a cyclone separation tank: the oil-water mixed medium enters the vortex tube from the inlet of the cyclone separating tank
The mixed liquid flows into the conical centrifugal cylinder along the lower end of the vortex cylinder, is influenced by the convection heat transfer effect in the heating cylinder, the dynamic viscosity of the oil-water mixed liquid in the conical centrifugal cylinder is reduced to 12-25mpa.s, the oil and water are better separated, the mixed liquid flows out of the overflow pipe and the sand settling pipe at the moment of high-speed injection of the vortex cylinder, the gas of the vortex cylinder and the conical centrifugal cylinder is compressed, thick oil, water and sand in the conical centrifugal cylinder flow through the overflow pipe due to the action of centrifugal force, the center of the conical centrifugal cylinder generates a short-time vacuum state, the thick oil with smaller density flows out of the overflow pipe due to the short-time vacuum adsorption effect on the upper part of the conical centrifugal cylinder and the driving of the overflow pipe air flow when flowing through the lower part of the conical centrifugal cylinder, and the thick oil with smaller density is accumulated. The high-speed fluid composed of the thick oil and the gas flowing out of the overflow pipe is injected into the oil storage tank, the gas escapes from the exhaust tower above, the thick oil liquid is stored in the oil storage tank, and the water and sand with higher density flow along the outer fluid wall due to the larger centrifugal force, and flows out along the sand settling pipe of the conical centrifugal cylinder, the flowing direction is not changed, and the water flowing out of the sand settling pipe and the oil sludge wrapped in the oil exploitation process fall into the slag basin together.
In the step (2) of the invention, in order to realize the linkage control of the overflow valve and the underflow valve, the control method of the overflow valve and the underflow valve is as follows: the pressure in the annular cavity in the surge tank is higher than the design pressure P of the surge tank, the underflow valve is automatically opened, when the pressure in the annular cavity in the surge tank is lower than the design pressure P of the surge tank, the underflow valve is automatically closed, in order to keep the injection flow rate of the oil-water mixture, the overflow valve is opened and closed independently of the underflow valve, the condition that the pressure in the surge tank is higher than the design pressure P of the surge tank is provided, and the condition that the pressure in the surge tank is closed is lower than the difference between the design pressure P of the surge tank and 0.5-1.0.
The invention has the beneficial effects that:
the invention integrates the water removal and sand removal processes in the petroleum exploitation process, has simple structure and easy operation and maintenance, can realize continuous large-pump water removal and sand removal operation in the petroleum exploitation process, realizes the separation of oil-water mixed liquid with the water content of more than 50 percent, can flexibly select the sizes of a tank body and a pipe diameter according to different petroleum exploitation amounts, avoids the arrangement of a tortuous pipeline and a multiple precipitation filtration process, and improves the separation efficiency of a large-displacement continuous solid-liquid two-phase flow.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of the surge tank.
Fig. 3 is a schematic structural view of the cyclone separator tank.
FIG. 4 is a pressure stabilizing and oil filling water layer diagram of the present invention.
FIG. 5 is a graph showing the change of the hydrodynamic viscosity of the oil-water mixture of the stratum with temperature according to the condition of the crude oil of the oil.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in the drawings, the use process or the installation process, the working principle.
The system is characterized by comprising an oil pumping unit 1, a pressure stabilizing tank 2, an air booster 3, a circulating water tank 4, a hydraulic circulating pump 5, a cyclone separating tank 6, a heater 7, an oil storage tank 8 and a sediment tank 9, wherein the oil pumping unit 1 is arranged at a wellhead, the oil pumping unit 1 is connected with an oil inlet pipe 17 of the pressure stabilizing tank 2 through an oil pumping pipeline 10, an air inlet pipe 11 of the pressure stabilizing tank 2 is connected with the air booster 3, an water outlet pipe 12 of the pressure stabilizing tank 2 is connected with the sediment tank 9, an oil outlet pipe 13 of the pressure stabilizing tank 2 is connected with an inlet of the cyclone separating tank 6 through a pipeline, the cyclone separating tank 6 comprises a vortex tube 14, a conical centrifugal tube 15, a heating tube 16, an overflow tube 18 and a sediment tube 19, the inlet of the cyclone separating tank 6 is arranged on the side surface of the vortex tube 14 and is connected with the vortex tube 14, the lower end of the vortex tube 14 is connected with the conical centrifugal tube 15, the sand tube 19 is connected with the sediment tank 9, the lower end of the overflow tube 18 extends into the vortex tube 14 through the upper end of the vortex tube 14 and the conical centrifugal tube 14, the upper end of the vortex tube 16 is connected with the heating tube 16 through the water inlet of the conical centrifugal tube 16, the heating tube 16 is connected with the water inlet of the heating tube 16 through the conical centrifugal tube 16, and the water outlet of the heating tube 16 is connected with the water tank 4 through the heating tube 16, and the water inlet of the heating tube is connected with the water tank 4.
Further, the surge tank 2 comprises an inner tank 21 and an outer tank 22, the inner tank 21 is arranged inside the outer tank 22 and fixed on the outer tank 22, an annular cavity 23 is arranged between the inner tank 21 and the outer tank 22,
the surge tank 2 on be equipped with oil feed pipe 17, oil outlet pipe 13, intake pipe 11 and outlet pipe 12 respectively, oil feed pipe 17 establish at the middle part of surge tank 2 and with interior jar 21 intercommunication, intake pipe 11 establish in the top of oil feed pipe 17 and with interior jar 21 intercommunication of surge tank 2, oil outlet pipe 13 establish on surge tank 2 of opposite side that corresponds with oil feed pipe 17 and with interior jar 21 intercommunication, oil outlet pipe 13 is less than the height of intake pipe 11, be equipped with on the interior jar 21 of oil outlet pipe 13 below with annular cavity 23 intercommunication's slow pressure apopore 24, interior jar 21 inside be equipped with upper guide inclined plate 25 and lower guide inclined plate 26, upper end of upper guide inclined plate 25 establish between intake pipe 11 and oil inlet pipe 17 and with interior jar 21 wall connection, the lower extreme of upper guide inclined plate 25 towards oil outlet pipe 13 position slope, the upper end of lower guide inclined plate 26 and on the interior jar 21 lateral wall between buffer apopore 24, lower guide inclined plate 26 and the lower end towards the annular cavity 22 that forms of lower guide inclined plate 21, the upper guide inclined plate 28 is equipped with on the upper guide inclined plate 22, the upper guide inclined plate 28 is equipped with the outlet pipe 22, the upper guide inclined plate 28 is equipped with the upper guide inclined plate 28.
Further, a gas discharge tower 30 is provided above the oil reservoir 8, and the gas inside the oil reservoir is discharged through the gas discharge tower 30.
Further, an oil phase magnetic flap level meter 31 is arranged in the surge tank 2, and the internal pressure is displayed through the level meter.
Further, surge tank 2 on be equipped with water injection pipe 34, water injection pipe 34 and surge tank 2 inside intercommunication are equipped with control valve on the water injection pipe, carry out preliminary water injection to surge tank 2 through the water injection pipe.
Further, the lower end of the lower diversion inclined plate is arranged at the position 1/5-1/3 below the inner tank.
Further, the position setting of the relief water outlet 24 is obtained according to the formula h=p/(ρg), where H is the design height of the relief water outlet 24, ρ is the density of water, g is the local gravitational acceleration, and P is the design pressure of the surge tank 2.
Further, a thermometer is arranged at the water outlet position at the upper end of the heating cylinder 16, the thermometer is connected with a controller in the heater 7, and the liquid outlet temperature is displayed through the thermometer to regulate the heating temperature of the heater 7.
The oil-water separation method of the system for removing water and sand scraps from the ground thickened oil is characterized by comprising the following steps of:
(1) Testing the curve of the dynamic viscosity of the oil-water mixture of the stratum along with the temperature change: firstly, testing a curve of the oil-water mixed hydrodynamic viscosity of a stratum with temperature change, determining the corresponding temperature X ℃ when the oil-water mixed hydrodynamic viscosity is lower than 12-25mpa.s, filling the circulating water tank 4 with water, setting the outlet temperature of the heater 7 to be X+2-5 ℃ according to the corresponding temperature X ℃ when the oil-water mixed hydrodynamic viscosity is lower than 12-25mpa.s, starting the hydraulic circulating pump 5 to set the flow Qm/h, and preheating the cyclone separating tank 6 to be X+2-5 ℃.
(2) Regulating the surge tank 2: injecting water into the surge tank 2 to a position not lower than the lower end of the lower diversion inclined plate 26, sealing partial air from a position below the lower diversion inclined plate 26, forming a gas buffer cavity between the water surface and the lower diversion inclined plate 26, starting the pumping unit 1, extracting oil-water mixed liquid in the stratum into the surge tank 2 through an oil pumping pipe and an oil inlet pipe 17 of the surge tank 2, and allowing the oil-water mixed liquid to flow below the upper diversion inclined plate 25 and above the lower diversion inclined plate 26 under the action of gravity and fall above the water surface, wherein the water content in the oil-water mixed liquid is above 50%, the height of the mixed liquid rises along with the increase of injected fluid, the mixed liquid is layered due to different densities of the oil water, the upper layer is water, the oil liquid level of the upper layer is displayed in real time through an oil phase magnetic flap liquid level meter 31, and the phenomenon of the oil-water in the upper layer oil is also displayed under the action of flow;
the method comprises the steps that as the injection level of mixed liquid increases, gas in a buffer cavity below a lower diversion inclined plate 26 of a pressure stabilizing tank 2 is injected into an annular cavity 23 of the pressure stabilizing tank 2 through a pressure-reducing water outlet 24, an air booster 3 is started immediately after the oil pumping machine 1 finishes ascending and oil extraction, the pressure stabilizing tank 2 starts to be pressurized, in the pressurizing process of the pressure stabilizing tank 2, the newly injected gas is accumulated at the upper part of the pressure stabilizing tank 2, the gas in the buffer cavity is gradually compressed, all the gas flows into the annular cavity 23 of the pressure stabilizing tank 2 through the pressure-reducing water outlet 24, and as the injection pressure increases, water at the lower part of the pressure stabilizing tank 2 is also injected into the annular cavity 23 of the pressure stabilizing tank 2 through the pressure-reducing water outlet 24 and is accumulated to a drain pipe at the lower end under the action of gravity; stopping pressurizing when the pumping unit 1 descends to the lowest point and extracts the oil-water mixed liquid; the circulation is carried out, so that the pressure of the surge tank 2 is ensured to be more than 0.58MPa after each pressurization is finished, the upper limit of the pressure setting is determined by the pressure-resistant degree of a pipeline, when the pressure in the surge tank 2 is higher than 0.58MPa, the underflow valve 29 and the overflow valve 28 at the lower part of the surge tank 2 are simultaneously opened, the underflow valve 29 discharges the water in the annular cavity 23 of the surge tank 2 to a sand basin, when the oil phase magnetic flap level meter 31 shows that the liquid level at the lower end of the oil phase is lowered to the lowest level of the water injection liquid level at the lower end of the lower diversion inclined plate 26, the underflow valve 29 is automatically closed, and after the overflow valve 28 is opened, the water-in-oil mixed liquid at the upper layer is injected into a vortex generating chamber along the tangential inlet of the cyclone separation tank 6 in the form of high-speed fluid;
(3) And the cyclone separation tank 6 is used for adjusting: the oil-water mixed medium enters the vortex tube 14 from the inlet of the cyclone separating tank 6
The mixed liquid flows tangentially into the wall surface of the vortex tube 14 at a high speed, vortex is generated under the action of gravity and high-speed jet flow, the mixed liquid forming the vortex flows into the conical centrifugal tube 15 along the lower end of the vortex tube 14, the mixed liquid is influenced by the convective heat transfer effect in the heating tube 16, the dynamic viscosity of the mixed liquid of oil and water in the conical centrifugal tube 15 is reduced to 12-25mpa.s, the optimal dynamic viscosity is 16mpa.s, oil and water are better separated, the mixed liquid is injected into the vortex tube 14 at a high speed, the gas of the vortex tube 14 and the conical centrifugal tube 15 is compressed to flow out of the overflow tube 18 and the sand settling tube 19, the thick oil, water and sand in the conical centrifugal tube 15 are subjected to the centrifugal force to flow by the wall, so that the center of the conical centrifugal tube 15 generates a short-time vacuum state, when the thick oil with small density flows through the lower part of the conical centrifugal tube 15, the thick oil of inner layer fluid is gathered, the thick oil is subjected to the vacuum adsorption effect generated at the upper part of the conical centrifugal tube 15 and the driving of the air flow of the overflow tube 18, and the thick oil with small density reversely flows out of the overflow tube 18. The high-speed fluid composed of the thick oil and the gas flowing out of the overflow pipe 18 is injected into the oil storage tank 8, the gas escapes from the upper exhaust tower 30, thick oil liquid is stored in the oil storage tank 8, and water and sand with higher density are always in the outer fluid wall-attached flow due to the fact that the water and sand are subjected to higher centrifugal force, the water flows out of the sand settling pipe 19 along the conical centrifugal cylinder 15, the flowing direction is not changed, and the water flowing out of the sand settling pipe 19 falls into the slag pool 9 together with the oil sludge wrapped in the oil exploitation process.
Further, in the step (2), in order to realize the linkage control of the overflow valve 28 and the underflow valve 29, the control method of the overflow valve 28 and the underflow valve 29 is as follows: the pressure in the annular cavity 23 in the surge tank 2 is higher than the design pressure P of the surge tank, the underflow valve 29 is automatically opened, when the pressure in the annular cavity 23 in the surge tank 2 is lower than the design pressure P of the surge tank, the underflow valve 29 is automatically closed, in order to keep the injection flow rate of the oil-water mixture, the overflow valve 28 is opened and closed independently of the underflow valve 29, the condition that the pressure in the surge tank 2 is higher than the design pressure P of the surge tank is provided for the overflow valve 28, and the condition that the pressure in the surge tank 2 is closed is lower than the difference between the design pressure P of the surge tank and 0.5-1.0.
Examples:
firstly, testing the curve of the oil-water mixing hydrodynamic viscosity of the stratum along with the change of temperature, and determining the corresponding temperature X ℃ when the oil-water mixing hydrodynamic viscosity is lower than 16 mpa.s. And filling the circulating water tank 4 with water, and setting the outlet temperature of the heater 7 to be X+2-5 ℃ according to the corresponding temperature X ℃ when the dynamic viscosity of the oil-water mixed solution is lower than 16.0 mpa.s. And starting the hydraulic circulating pump 5 to set the flow to Qm and/h, and preheating the vortex generating chamber, the centrifugal cavity and the conical spiral flow passage of the cyclone separating tank 6 to X+2-5 ℃.
The change relation of the dynamic viscosity of the oil-water mixture of the stratum with the temperature is tested according to the condition of the crude oil of the oil, and is shown in figure 5.
According to the above graph, the corresponding temperature is 90-100 ℃ when the dynamic viscosity of the oil-water mixture is lower than 16.0 mpa.s, the specific temperature can be determined by detailed experiments, the measured temperature is 94 ℃, the outlet temperature of the heater is controlled between 92-99 ℃,
then water is injected into the surge tank 2 to the liquid level at the lower end position of the lower diversion inclined plate 26, and part of air is sealed in the air buffer cavity. The pumping unit 1 is started, oil-water mixed liquid in the stratum is extracted into the pressure stabilizing tank 2 through the oil pumping pipeline 10 and the oil inlet pipe 17 of the pressure stabilizing tank 2, the mixed liquid falls on the upper end of the water injection liquid level through the upper diversion inclined plate 25 and the lower diversion inclined plate 26 under the action of gravity, and the height of the mixed liquid rises along with the increase of the injected fluid. Because the densities of the oil and water are different, the mixed liquid can show layering, the upper layer is oil and the lower layer is water, the oil phase liquid level height is shown in real time through the oil phase magnetic flap liquid level meter 31, and the phenomenon of water-in-oil is also shown in the upper layer oil under the flowing action; as the injection level of the mixed liquid increases, the gas in the gas buffer cavity formed by the lower diversion inclined plate 26 of the pressure stabilizing tank 2 and the cylinder body is injected into the annular cavity 23 of the pressure stabilizing tank 2 through the pressure-reducing water outlet hole 24. When the pumping unit 1 finishes the upward oil extraction, the air booster 3 is started immediately to start boosting the surge tank 2, newly injected gas is gathered on the upper part of the surge tank 2 in the boosting process of the surge tank 2, and the gas in the buffer cavity is gradually compressed and completely flows into the annular cavity 23 of the surge tank 2 through the buffer water outlet 24. Along with the increase of the injection pressure, the water at the lower part of the surge tank 2 is injected into the annular cavity 23 of the surge tank 2 through the surge water outlet hole 24, and is gathered towards the lower water outlet pipe 12 under the action of gravity. The upper part of the annular cavity 23 of the surge tank 2 is provided with buffer gas, the lower part is provided with injected water, and the pressure between the annular space and the inside of the surge tank 2 can be maintainedThe balance is realized, and the phenomenon that the annular deformation of the surge tank 2 influences the discharge of water is prevented; stopping pressurizing when the pumping unit 1 descends to the lowest point and extracts the oil-water mixed liquid; the cyclic reciprocation ensures that the pressure of the surge tank 2 is more than 0.58MPa after each pressurization, and the upper limit of the pressure setting is determined by the pressure-resistant degree of the pipeline. The relation between the specific flow and the pressure of the surge tank 2 is referred to by the public expression q= [ P/(ρ) 1 gSL)] 0.5 、V = 4Q/(3.1416*d 2 ) Adjusting, wherein Q is the flow rate in the pipe of the overflow valve; p is the pipeline pressure; ρ1 is the fluid density; g is gravity acceleration, S is pipeline friction, S=10.3 x n 2/d 5.33, n is the roughness of the inner wall of the pipe, and d is the inner diameter of the overflow valve pipe; the invention adopts the pipe length of the overflow valve, the pipe inner diameter of the overflow valve is 3.0cm, the roughness rate of the pipe inner wall is 0.02, the pipe pressure between the pressure stabilizing tank 2 and the cyclone separating tank 6 is consistent to be 0.58MPa, namely 580000pa, the pipe length can be automatically adjusted according to the space of the site, the optimal inlet flow velocity of the cyclone separating tank 68 is 9.0m/s, the pipe length in the overflow valve is 3m, and g gravity acceleration is 9.8m/s 2 The average density of the oil-water mixed system with the water content of 60% is 880kg/m 3 。
In order to maintain the pressure of the gas buffer cavity and the annular cavity 23 of the surge tank 2, that is, when the actual pressure in the surge tank 2 is smaller than the design pressure of the surge tank 2, air flows only into the annular cavity 23 of the surge tank 2 through the surge water outlet 24 of the surge tank 2, and when the actual pressure in the surge tank 2 is larger than the design pressure, moisture flows into the annular cavity 23 of the surge tank 2 through the annular surge water outlet 24 of the surge tank 2. In order to meet the above condition, the relationship between the height design of the surge tank 2 and the design pressure of the surge tank 2 is h=p/(ρg), where H is the design height of the inlet of the surge tank 2, ρ is the density of water, and g is the local gravitational acceleration. The pressure of the surge tank 2 is 0.58MPa, and the height of the surge tank 2 for buffering the water outlet hole 24 is 58cm away from the water outlet pipe 12.
Because of the different densities, air is gathered at the upper end of the surge tank 2, and the oil-water mixture is gathered at the bottom of the surge tank 2. When the pressure in the surge tank 2 is higher than 0.58MPa, the overflow valves respectively connected with the water outlet pipe 12 at the lower part of the surge tank 2 and the oil outlet pipe 13 of the oil-water mixture at the upper part are opened at the same time. The water in the annular cavity 23 of the pressure stabilizing tank 2 is discharged to the grit chamber by the water outlet pipe 12, and when the oil phase magnetic flap level meter 31 shows that the oil phase lower end liquid level is lowered to the water injection liquid level (the water injection liquid level is the initial water injection liquid level), the underflow pressure valve 29 connected with the water outlet pipe 12 is automatically closed. After the overflow valve 28 connected with the upper oil-water mixed liquid outlet pipe 13 is opened, the mixed liquid of the upper water-in-oil layer is injected into the vortex tube 14 along the tangential inlet of the cyclone separation tank 6 in the form of high-speed fluid.
In order to realize the linkage control of the overflow valve 28 and the underflow valve 29, the control method of the overflow valve 28 and the underflow valve 29 is as follows: the underflow valve 29 is automatically opened when the pressure in the annular cavity 23 in the surge tank 2 is higher than 0.58MPa, and when the pressure in the annular cavity 23 in the surge tank 2 is lower than 0.58MPa, the underflow valve 29 is automatically closed, and in order to maintain the injection flow rate of the oil-water mixture, the overflow valve 28 is opened and closed independently of the underflow valve 29, the condition that the pressure inside the surge tank 2 is higher than 0.58MPa, and the condition that the pressure inside the overflow valve 28 is closed is lower than 0.5 MPa.
The mixed liquid flows in tangentially at a high speed by the wall surface of the vortex tube 14, the flow speed is 9.0m/s, vortex is generated under the action of gravity and high-speed jet flow, and the mixed liquid forming the vortex flows into the conical centrifugal tube 15 along the lower end of the vortex tube 14
The dynamic viscosity of the oil-water mixed solution in the conical centrifugal cylinder 15 is reduced to 12-25mpa.s under the influence of the convection heat transfer effect in the heating cylinder 16, oil and water are better separated, the mixed solution is injected into the vortex cylinder 14 at high speed, gas of the vortex cylinder 14 and the conical centrifugal cylinder 15 flows out from the overflow pipe 18 and the sand settling pipe 19 under compression, thick oil, water and sand in the conical centrifugal cylinder 15 are subjected to centrifugal force to flow along the wall, so that the center of the conical centrifugal cylinder 15 generates a short-time vacuum state, when thick oil with smaller density flows through the lower part of the conical centrifugal cylinder 15, a large amount of mixed solution flows in at high speed to generate different centrifugal forces due to smaller taper of the bottom of the conical centrifugal cylinder 15, and the buoyancy and centrifugal force applied to different densities of the thick oil and the water are also different; the thick oil with smaller density is subjected to smaller centrifugal force and larger buoyancy; the water and sand with higher density are subject to higher centrifugal force and lower buoyancy; the mixed liquid in the centrifugal cavity is divided into an inner layer and an outer layer by using thick oil and water as carriers, the diameter of the lower part of the conical centrifugal cylinder 15 is reduced, thick oil of inner layer fluid is gathered, the thick oil is driven by vacuum adsorption effect generated in short time at the upper part of the conical centrifugal cylinder 15 and airflow of the overflow pipe 18, reverse spiral flow is generated in the thick oil with smaller density, the thick oil flows out of the overflow pipe 18, high-speed fluid composed of thick oil and gas flows out of the overflow pipe 18 is injected into the oil storage tank 8, gas escapes from the upper exhaust tower 30, thick oil liquid is stored in the oil storage tank 8, water and sand with larger density flow along the sand settling pipe 19 of the conical centrifugal cylinder 15 due to larger centrifugal force, the flowing direction is not changed, and water flowing out of the sand settling pipe 19 and oil sludge clamped in the oil exploitation process fall into the sediment tank 9 together.
In this example, only 16mpa.s of dynamic viscosity was tested, and the best oil-water separation was achieved at temperatures corresponding to the dynamic viscosities of 12 mpa.s and 25mpa.s and between 12 mpa.s and 25mpa.s during the specific test.
The surge tank 2 and the cyclone separation tank 6 with the heating cylinder 16 with unique design are simultaneously used for better oil-water separation effect, the surge tank 2 separates oil from water under the gravity action of water, the inner tank 21 of the surge tank 2 is filled with water preferentially, the water level is not lower than the lower end position of the lower diversion inclined plate 26, the lower part of the lower diversion inclined plate 26 is further sealed by the water, oil is prevented from entering the lower part of the lower diversion inclined plate 26, the upper diversion inclined plate 25 arranged on the inner tank 21 can buffer the oil-water mixture rushing into the inner tank 21, the turbulence intensity of the oil-water mixture flowing into the surge tank is reduced, and the upper diversion inclined plate 25 is provided with a vent hole, so that when the oil-water mixture flows, the gas in the part of space is pressed into the compressed air input by the air booster 3 above through the vent hole, and a large amount of bubbles are prevented from being formed by stirring the oil-water mixture and the air, and the oil-water separation effect is influenced; the upper diversion inclined plate 25 also diverts the mixed thick oil buffered below the plate surface onto the lower diversion inclined plate 26 below, the lower diversion inclined plate 26 has the function of determining the height of the water injection liquid level, separating oil from water, and forming a buffering cavity between the lower diversion inclined plate 26 and the water injection liquid level, so that the pressure between the inner tank 22 and the outer tank 22 can be balanced.
The inner tank can be protected due to the annular cavity 23 between the inner layer and the outer layer of the surge tank. When the pressure of the inner tank rises, the lower flow guiding inclined plate separates the upper space of the inner tank from the annular cavity and the buffer cavity, a U-shaped pipe communicating vessel is formed, the pressure of the inner tank can be synchronously raised through the annular cavity and the buffer cavity, no pressure difference is formed between the inner tank and the outer tank, and the inner tank is protected from deformation.
The water content in the oil-water mixed liquid is not lower than 50%, so that the water level and the oil level are increased simultaneously after the oil-water mixed liquid is injected into the surge tank. Taking 50% water as an example, when the water level is increased to the height of the water outlet hole 24 (H=58 cm), H=58 cm, and the oil phase liquid level is higher than h+H; water in the lower part of the inner tank flows into the lower part of the annular cavity 23 through the water outlet 24. When the pressure of the inner tank and the outer tank reaches 0.58MPa, the overflow valve and the underflow valve are simultaneously opened, and the pipe diameters are consistent, so that the water-in-oil outflow rate of the upper overflow valve is the same as the water outflow rate of the lower overflow valve. And the later stage is continuously injected with the oil-water mixed solution, the height of the water phase liquid level of the inner tank is maintained at the position H, and the heights of the oil phase and the water-in-oil phase liquid level fluctuate at the position H+h (determined by the oil phase density and the water content).
Claims (7)
1. The system is characterized by comprising an oil pumping unit, a pressure stabilizing tank, an air booster, a circulating water tank, a hydraulic circulating pump, a cyclone separating tank, a heater, an oil storage tank and a sediment tank, wherein the oil pumping unit is arranged at a wellhead and is connected with an oil inlet pipe of the pressure stabilizing tank through an oil pumping pipeline, an air inlet pipe of the pressure stabilizing tank is connected with the air booster, an water outlet pipe of the pressure stabilizing tank is connected with the sediment tank, an oil outlet pipe of the pressure stabilizing tank is connected with an inlet of the cyclone separating tank through a pipeline, the cyclone separating tank comprises a vortex tube, a conical centrifugal tube, a heating tube, an overflow tube and a sediment tube, an inlet of the cyclone separating tank is arranged on the side surface of the vortex tube and is in vortex connection with the vortex tube, the lower end of the vortex tube is connected with the conical centrifugal tube, the lower end of the conical centrifugal tube is connected with the sediment tube, the sediment tube is connected with the sediment tank, the lower end of the overflow tube extends into the vortex tube, the upper end of the overflow pipe extends out of the vortex tube and is connected with the oil storage tank through a pipeline, a heating tube is sleeved on the outer side of the conical centrifugal tube, a spiral blade is wound between the inner wall of the heating tube and the outer wall of the conical centrifugal tube, a water inlet at the lower end of the heating tube is connected with an outlet of the circulating water tank through a hydraulic circulating pump, a water outlet at the upper end of the heating tube is connected with an inlet of the circulating water tank through a heater, the pressure stabilizing tank comprises an inner tank and an outer tank, the inner tank is arranged inside the outer tank and fixed on the outer tank, an annular cavity is arranged between the inner tank and the outer tank, an oil inlet pipe, an oil outlet pipe, an air inlet pipe and an air outlet pipe are respectively arranged on the pressure stabilizing tank, the oil inlet pipe is arranged in the middle of the pressure stabilizing tank and is communicated with the inner tank, the air inlet pipe is arranged above the oil inlet pipe and is communicated with the inner tank of the pressure stabilizing tank, the oil outlet pipe is arranged on the pressure stabilizing tank at the other side corresponding to the oil inlet pipe and is communicated with the inner tank, the oil outlet pipe is lower than the height of intake pipe, be equipped with the water outlet that slowly presses with annular cavity intercommunication on the inner tank of oil outlet pipe below, the inner tank inside be equipped with water conservancy diversion hang plate and lower water conservancy diversion hang plate, the upper end of going up water conservancy diversion hang plate establish between intake pipe and oil feed pipe and be connected with the inner tank wall, the lower extreme of going up water conservancy diversion hang plate inclines towards the oil outlet pipe position, the upper end of lower water conservancy diversion hang plate be located the inner tank lateral wall between oil outlet pipe and the water outlet that slowly presses, the lower extreme of lower water conservancy diversion hang plate incline towards the below slope and with the inner tank lateral wall be not connected and form the water guide hole, the outer jar of annular cavity lower extreme on connect the outlet pipe, the oil outlet pipe on be equipped with the overflow pressure valve, the water outlet pipe on be equipped with the underflow pressure valve, last water conservancy diversion hang plate on be equipped with the air vent, the lower end of lower water conservancy diversion hang plate establish in the below 1/5-1/3 positions of inner tank, the height that slowly presses the water outlet hole is located down water conservancy diversion hang plate between the upper end and the lower end height.
2. The system for removing water and sand from ground thickened oil according to claim 1, wherein an exhaust tower is arranged above the oil storage tank, and the gas in the oil storage tank is exhausted through the exhaust tower.
3. The system for removing water and sand from ground thickened oil according to claim 1, wherein the pressure stabilizing tank is internally provided with an oil phase magnetic flap level gauge, and the internal pressure is displayed by the level gauge.
4. The system for removing water and sand from ground thickened oil according to claim 1, wherein the pressure stabilizing tank is provided with a water injection pipe, the water injection pipe is communicated with the inside of the pressure stabilizing tank, the water injection pipe is provided with a control valve, and the pressure stabilizing tank is preliminarily injected with water through the water injection pipe.
5. The system for removing water and sand from ground thickened oil according to claim 1, wherein a thermometer is arranged at the water outlet at the upper end of the heating cylinder, the thermometer is connected with a controller in the heater, and the temperature of the liquid outlet is displayed by the thermometer to regulate the heating temperature of the heater.
6. The oil-water separation method of the system for removing water and sand scraps from the ground thickened oil is characterized by comprising the following steps of:
(1) Testing the curve of the dynamic viscosity of the oil-water mixture of the stratum along with the temperature change: firstly, testing a curve of the oil-water mixed hydrodynamic viscosity of a stratum which belongs to the stratum along with the change of temperature, determining the corresponding temperature X ℃ when the oil-water mixed hydrodynamic viscosity is lower than 12-25mpa.s, filling a circulating water tank with water, setting the outlet temperature of a heater to be X+2-5 ℃ according to the corresponding temperature X ℃ when the oil-water mixed hydrodynamic viscosity is lower than 12-25mpa.s, starting a hydraulic circulating pump to set the flow of Qm/h, preheating a cyclone separating tank to be X+2-5 ℃,
(2) And (3) regulating a surge tank: injecting water into the pressure stabilizing tank to a position not lower than the lower end of the lower diversion inclined plate, sealing part of air at a position below the lower diversion inclined plate, forming a gas buffer cavity between the water surface and the lower diversion inclined plate, starting the pumping unit, extracting oil-water mixed liquid in the stratum into the pressure stabilizing tank through an oil pumping pipe and an oil inlet pipe of the pressure stabilizing tank, and allowing the oil-water mixed liquid to flow below the upper diversion inclined plate and above the lower diversion inclined plate under the action of gravity to fall above the water surface; the method comprises the steps that with the increase of the injection liquid level of mixed liquid, gas in a buffer cavity below a lower diversion inclined plate of a pressure stabilizing tank is injected into an annular cavity of the pressure stabilizing tank through a slow pressure water outlet, an air booster is started immediately after the oil pumping machine finishes ascending oil extraction, the pressure stabilizing tank is pressurized, in the pressurizing process of the pressure stabilizing tank, the newly injected gas is accumulated at the upper part of the pressure stabilizing tank, the gas in the buffer cavity is gradually compressed, all the gas flows into the annular cavity of the pressure stabilizing tank through the slow pressure water outlet, and with the increase of injection pressure, water at the lower part of the pressure stabilizing tank is also injected into the annular cavity of the pressure stabilizing tank through the slow pressure water outlet, and is accumulated to a drain pipe at the lower end under the action of gravity; stopping pressurizing when the pumping unit descends to the lowest point and extracts the oil-water mixed liquid; the circulation is carried out, so that the pressure of the surge tank is ensured to be more than 0.58MPa after the pressurization is finished each time, namely the design pressure of the surge tank is realized, the upper limit of the pressure setting is determined by the pressure-resistant degree of a pipeline, when the pressure in the surge tank is higher than 0.58MPa, an underflow pressure valve and an overflow pressure valve of the lower layer of the surge tank are simultaneously opened, the underflow pressure valve discharges water in an annular cavity of the surge tank to a sand basin, when an oil phase magnetic flap level meter shows that the liquid level at the lower end of the oil phase is reduced to the lowest level of the water injection liquid level at the lower end of a lower diversion inclined plate, the underflow pressure valve is automatically closed, and after the overflow pressure valve is opened, the mixed liquid of water in the upper layer of oil is injected into a vortex generating chamber along a tangential inlet of a cyclone separation tank in a high-speed fluid mode;
(3) And (3) regulating a cyclone separation tank: the oil-water mixed medium enters the vortex tube from the inlet of the cyclone separating tank and flows in at a high speed tangentially to the wall surface of the vortex tube, vortex is generated under the action of gravity and high-speed jet flow, the mixed liquid forming the vortex flows into the conical centrifugal tube along the lower end of the vortex tube, the mixed liquid is influenced by the convection heat transfer effect in the heating tube, the dynamic viscosity of the oil-water mixed liquid in the conical centrifugal tube is reduced to 12-25mpa.s, oil-water better separates, the mixed liquid flows out from the overflow tube and the sand settling tube under compression at the moment of high-speed injection into the vortex tube, the thick oil, water and sand in the conical centrifugal tube are subjected to the action of centrifugal force and flow along the wall, so that the center of the conical centrifugal tube generates a short-time vacuum state, when the thick oil with smaller density flows through the lower part of the conical centrifugal tube, the thick oil is gathered by the vacuum adsorption effect generated at the upper part of the conical centrifugal tube and the driving of the air flow, the thick oil with smaller density can generate reverse spiral flow, the thick oil flows out from the overflow tube and the sand tank, the high-water and the sand flows out from the oil tank along the high-sand tank and the high-speed sand flow and the sand flow along the direction of the sand tank, and the large-sand flow is not adhered to the wall is formed by the high-sand flow.
7. The method for separating oil from water in a system for removing water and sand from heavy oil on the ground according to claim 6, wherein in the step (2), in order to realize linkage control of the overflow valve and the underflow valve, the control method of the overflow valve and the underflow valve is as follows: the pressure in the annular cavity in the surge tank is higher than the design pressure P of the surge tank, the underflow valve is automatically opened, when the pressure in the annular cavity in the surge tank is lower than the design pressure P of the surge tank, the underflow valve is automatically closed, in order to keep the injection flow rate of the oil-water mixture, the overflow valve is opened and closed independently of the underflow valve, the condition that the pressure in the surge tank is higher than the design pressure P of the surge tank is provided, and the condition that the pressure in the surge tank is closed is lower than the difference between the design pressure P of the surge tank and 0.5-1.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210738181.2A CN115197744B (en) | 2022-06-28 | 2022-06-28 | System for removing water and sand scraps from ground thickened oil and oil-water separation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210738181.2A CN115197744B (en) | 2022-06-28 | 2022-06-28 | System for removing water and sand scraps from ground thickened oil and oil-water separation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115197744A CN115197744A (en) | 2022-10-18 |
| CN115197744B true CN115197744B (en) | 2023-09-19 |
Family
ID=83578216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210738181.2A Active CN115197744B (en) | 2022-06-28 | 2022-06-28 | System for removing water and sand scraps from ground thickened oil and oil-water separation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115197744B (en) |
Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001009204A (en) * | 1999-06-30 | 2001-01-16 | Fumio Sugiyama | Oil separating device |
| CN2841957Y (en) * | 2005-07-22 | 2006-11-29 | 中国石油化工股份有限公司 | Liquid flow heating well head sand-removing device |
| KR100818803B1 (en) * | 2008-01-18 | 2008-04-02 | 이원신 | Oil separator |
| CN101319607A (en) * | 2008-07-22 | 2008-12-10 | 濮阳市天地人环保工程技术有限公司 | Method for no-grounding treatment and comprehensive utilization of oil-gas field downhole operation output solution |
| CA2686140A1 (en) * | 2008-12-12 | 2010-06-12 | Maoz Betser-Zilevitch | A system and method for water recovery from tailings |
| CN103045295A (en) * | 2013-01-07 | 2013-04-17 | 中国科学院力学研究所 | Water removing system for gas-water-containing crude oil and application method of system |
| CN103463909A (en) * | 2013-08-31 | 2013-12-25 | 蚌埠高科能源装备有限公司 | Horizontal type double-acting separation buffer |
| CN103982170A (en) * | 2014-04-10 | 2014-08-13 | 兰州科庆仪器仪表有限责任公司 | Small and medium liquid volume and large air volume oil well three-phase measuring device |
| WO2015000447A1 (en) * | 2013-07-03 | 2015-01-08 | 胜利油田隆迪石油技术(装备)有限责任公司 | Injection-extraction integrated sand-discharging oil extraction method for a thermal recovery and device thereof |
| CN105545278A (en) * | 2016-02-29 | 2016-05-04 | 中国科学院力学研究所 | Oil field surface desanding device |
| CN106640029A (en) * | 2016-12-08 | 2017-05-10 | 中海艾普油气测试（天津）有限公司 | Thickened oil hydraulic power decomposition defoamer and control method |
| CN109555511A (en) * | 2018-11-21 | 2019-04-02 | 山东科技大学 | A kind of oil well desanding device based under pulsing jet technology and cyclonic separation mechanism |
| CN208856952U (en) * | 2018-06-06 | 2019-05-14 | 永春县优科科技有限公司 | Device for oil exploitation water-oil separating |
| CN209838390U (en) * | 2019-03-07 | 2019-12-24 | 中国石油化工股份有限公司 | Oil well produced liquid near centralized processing system |
| CN211069306U (en) * | 2019-07-08 | 2020-07-24 | 西南石油大学 | Device for separating oil and sand from sand-containing thickened oil |
| CN111518587A (en) * | 2020-03-27 | 2020-08-11 | 海洋石油工程股份有限公司 | Offshore oil platform thickened oil desanding system and method |
| CN112877094A (en) * | 2021-01-12 | 2021-06-01 | 西南石油大学 | Oil sand multistage separation device |
| CN213377266U (en) * | 2020-10-23 | 2021-06-08 | 中国石油大学(华东) | Heatable hydrocyclone |
| CN113430001A (en) * | 2021-07-30 | 2021-09-24 | 上海兴全电力技术有限公司 | Online heating, descaling and desanding device for oilfield wellhead produced liquid and application method thereof |
| CN113482586A (en) * | 2021-08-17 | 2021-10-08 | 中国海洋石油集团有限公司 | Offshore thermal recovery thickened oil gathering and transportation treatment process bag |
-
2022
- 2022-06-28 CN CN202210738181.2A patent/CN115197744B/en active Active
Patent Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001009204A (en) * | 1999-06-30 | 2001-01-16 | Fumio Sugiyama | Oil separating device |
| CN2841957Y (en) * | 2005-07-22 | 2006-11-29 | 中国石油化工股份有限公司 | Liquid flow heating well head sand-removing device |
| KR100818803B1 (en) * | 2008-01-18 | 2008-04-02 | 이원신 | Oil separator |
| CN101319607A (en) * | 2008-07-22 | 2008-12-10 | 濮阳市天地人环保工程技术有限公司 | Method for no-grounding treatment and comprehensive utilization of oil-gas field downhole operation output solution |
| CA2686140A1 (en) * | 2008-12-12 | 2010-06-12 | Maoz Betser-Zilevitch | A system and method for water recovery from tailings |
| CN103045295A (en) * | 2013-01-07 | 2013-04-17 | 中国科学院力学研究所 | Water removing system for gas-water-containing crude oil and application method of system |
| WO2015000447A1 (en) * | 2013-07-03 | 2015-01-08 | 胜利油田隆迪石油技术(装备)有限责任公司 | Injection-extraction integrated sand-discharging oil extraction method for a thermal recovery and device thereof |
| CN103463909A (en) * | 2013-08-31 | 2013-12-25 | 蚌埠高科能源装备有限公司 | Horizontal type double-acting separation buffer |
| CN103982170A (en) * | 2014-04-10 | 2014-08-13 | 兰州科庆仪器仪表有限责任公司 | Small and medium liquid volume and large air volume oil well three-phase measuring device |
| CN105545278A (en) * | 2016-02-29 | 2016-05-04 | 中国科学院力学研究所 | Oil field surface desanding device |
| CN106640029A (en) * | 2016-12-08 | 2017-05-10 | 中海艾普油气测试（天津）有限公司 | Thickened oil hydraulic power decomposition defoamer and control method |
| CN208856952U (en) * | 2018-06-06 | 2019-05-14 | 永春县优科科技有限公司 | Device for oil exploitation water-oil separating |
| CN109555511A (en) * | 2018-11-21 | 2019-04-02 | 山东科技大学 | A kind of oil well desanding device based under pulsing jet technology and cyclonic separation mechanism |
| CN209838390U (en) * | 2019-03-07 | 2019-12-24 | 中国石油化工股份有限公司 | Oil well produced liquid near centralized processing system |
| CN211069306U (en) * | 2019-07-08 | 2020-07-24 | 西南石油大学 | Device for separating oil and sand from sand-containing thickened oil |
| CN111518587A (en) * | 2020-03-27 | 2020-08-11 | 海洋石油工程股份有限公司 | Offshore oil platform thickened oil desanding system and method |
| CN213377266U (en) * | 2020-10-23 | 2021-06-08 | 中国石油大学(华东) | Heatable hydrocyclone |
| CN112877094A (en) * | 2021-01-12 | 2021-06-01 | 西南石油大学 | Oil sand multistage separation device |
| CN113430001A (en) * | 2021-07-30 | 2021-09-24 | 上海兴全电力技术有限公司 | Online heating, descaling and desanding device for oilfield wellhead produced liquid and application method thereof |
| CN113482586A (en) * | 2021-08-17 | 2021-10-08 | 中国海洋石油集团有限公司 | Offshore thermal recovery thickened oil gathering and transportation treatment process bag |
Non-Patent Citations (2)
| Title |
|---|
| 海上油田井下油水分离系统的优化设计;姜建平;谢双喜;陈学政;陈建庆;;长春理工大学学报(自然科学版)(第04期);全文 * |
| 立式油水综合处理罐;伍年青, 赵越超, 张波;中国海上油气(工程)(第05期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115197744A (en) | 2022-10-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101146584B (en) | Separator to separate a liquid/liquid/gas/solid mixture | |
| US20050145388A1 (en) | Subsea process assembly | |
| WO2013021840A1 (en) | Gas lift system and gas lift method | |
| CN105031977B (en) | Oil gas water multi-phase separation system and application process thereof | |
| CN106430412B (en) | The underwater three-level separation method of axial-flow type and its control system | |
| CN206063881U (en) | A kind of oily-water seperating equipment of the oil field extracted water containing sand | |
| CN107129080A (en) | A kind of electro-desalting effluent sewerage oil removing system and deoiling method | |
| CN108222914A (en) | A kind of membrane material downhole oil-water separation device and flow string and oil-water separation method | |
| CN209348179U (en) | Waste mineral oil water-oil separating apparatus for demonstrating | |
| CN115197744B (en) | System for removing water and sand scraps from ground thickened oil and oil-water separation method thereof | |
| WO2013021842A1 (en) | Gas lift system and gas lift method | |
| CN2392586Y (en) | Oil, gas water and sand separating-processing apparatus for oil-field joint station | |
| CN108191001A (en) | A kind of oily-water seperating equipment | |
| CN202015517U (en) | Composite high-efficiency phase separator | |
| CN207031154U (en) | A kind of electro-desalting effluent sewerage oil removing system | |
| CN207468254U (en) | Tank in a kind of tank | |
| CN203890089U (en) | Efficient air flotation treatment integrated device for alkaline-surfactant-polymer flooding oilfield produced water | |
| CN206613262U (en) | A kind of spiral stream guidance cyclonic separation settler | |
| CN115163011A (en) | Automatic pressure-control circulating sand-removing exploitation system and exploitation method for geothermal resources | |
| CN2559790Y (en) | Horizontal-upward flow energy-saving oil-gas water sand separator | |
| CN108854163A (en) | A kind of oleophylic filler Gravity Separation oily-water seperating equipment and separation method | |
| CN209307464U (en) | The device of oil slick in earth solution is removed in Rare-Earth Extraction Process | |
| CN2256338Y (en) | Hydraulic swirler for oil-water mixed liquid preseparation | |
| RU2498050C2 (en) | Method for production of methane from near-bottom hydrate deposits | |
| CN201621456U (en) | Gas-liquid separating device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |