CN114876432A - Fractured oil-gas reservoir hot fluid mixing and injecting in-situ residual oil water plugging process and device - Google Patents
Fractured oil-gas reservoir hot fluid mixing and injecting in-situ residual oil water plugging process and device Download PDFInfo
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- CN114876432A CN114876432A CN202210581112.5A CN202210581112A CN114876432A CN 114876432 A CN114876432 A CN 114876432A CN 202210581112 A CN202210581112 A CN 202210581112A CN 114876432 A CN114876432 A CN 114876432A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 158
- 239000012530 fluid Substances 0.000 title claims abstract description 78
- 238000002156 mixing Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 27
- 230000008569 process Effects 0.000 title claims abstract description 21
- 239000003921 oil Substances 0.000 claims abstract description 181
- 238000002347 injection Methods 0.000 claims abstract description 58
- 239000007924 injection Substances 0.000 claims abstract description 58
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 57
- 238000000926 separation method Methods 0.000 claims abstract description 54
- 238000010790 dilution Methods 0.000 claims abstract description 45
- 239000012895 dilution Substances 0.000 claims abstract description 45
- 239000010779 crude oil Substances 0.000 claims abstract description 44
- 239000006185 dispersion Substances 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims description 123
- 238000003756 stirring Methods 0.000 claims description 45
- 238000009413 insulation Methods 0.000 claims description 43
- 238000007865 diluting Methods 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 20
- 230000001737 promoting effect Effects 0.000 claims description 17
- 239000004215 Carbon black (E152) Substances 0.000 claims description 11
- 229930195733 hydrocarbon Natural products 0.000 claims description 11
- 150000002430 hydrocarbons Chemical class 0.000 claims description 11
- 238000003860 storage Methods 0.000 claims description 11
- 238000009991 scouring Methods 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
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- 230000035945 sensitivity Effects 0.000 abstract description 6
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- 238000011010 flushing procedure Methods 0.000 description 6
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- 239000003129 oil well Substances 0.000 description 4
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- 239000002356 single layer Substances 0.000 description 3
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- 206010070834 Sensitisation Diseases 0.000 description 2
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- 239000010410 layer Substances 0.000 description 2
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/38—Arrangements for separating materials produced by the well in the well
- E21B43/385—Arrangements for separating materials produced by the well in the well by reinjecting the separated materials into an earth formation in the same well
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Extraction Or Liquid Replacement (AREA)
Abstract
The application belongs to the technical field of oil and gas development, and particularly relates to a fractured oil and gas reservoir hot fluid mixing and injecting in-situ residual oil water plugging process and device. The existing water shutoff agent has poor matching property with the oil reservoir environment and has the problems of sensitivity and pollution. The application provides a fissile oil and gas reservoir hot-fluid is mixed and is annotated normal position residual oil water shutoff technology, the method includes that carry out oil-water separation to crude oil and obtain low moisture crude oil, it is right low moisture crude oil carries out the oil residue separation and obtains the oil residue, right the oil residue is mixed and is annotated the dilution and obtain the water shutoff agent, mixes high-pressure gas and water shutoff agent and obtains the dispersion injection state water shutoff agent, will the dispersion injection state water shutoff agent pours into the stratum. The problems that the existing water shutoff agent is not well matched with an oil reservoir environment, has sensitivity and pollution and is easy to flush by subsequent water drive can be solved.
Description
Technical Field
The application belongs to the technical field of oil and gas development, and particularly relates to a fractured oil and gas reservoir hot fluid mixing and injecting in-situ residual oil water plugging process and device.
Background
A fractured reservoir refers to a reservoir in which the reservoir space and percolation paths of the reservoir are primarily fractured. Fractures are formed from a variety of causes, primarily structural fractures, and reservoirs are typically tight, brittle formations that are impermeable and poorly permeable. For fractured oil and gas reservoirs, stratum energy can be effectively supplemented through single-well water injection, and the crude oil recovery rate is improved, but in order to inhibit the oil field from entering a high water-cut period too early, an oil well water plugging method is very necessary for improving the development effect.
The oil well water plugging method mainly comprises mechanical water plugging and chemical water plugging, and a liquid layer is obtained by plugging the high-permeability oil well, so that invalid circulation of injected liquid is reduced, sweep efficiency is improved, and development effect is improved; the existing chemical water plugging method is commonly used, wherein an external inorganic water plugging agent and an organic synthetic water plugging agent are mainly used in the water plugging application process, and the water channeling channel cannot be plugged to a high degree due to the non-selective plugging effect of the water plugging agent; the application effect and the validity period of the existing water shutoff agent are generally lower than those of a profile control agent, and the existing water shutoff agent is easy to flush away by subsequent water drive and has poor water shutoff effect. In addition, the external water shutoff agent cannot be recycled after being injected into the stratum, and the water shutoff cost is higher; some water shutoff agents have the problem of compatibility with stratum and damage a reservoir.
Disclosure of Invention
1. Technical problem to be solved
Based on the existing common chemical water plugging method, the external inorganic water plugging agent and the organic synthetic water plugging agent are mainly used in the water plugging application process, and the non-selective plugging effect of the water plugging agent causes that a water channeling channel cannot be plugged to a higher degree; the application effect and the validity period of the existing water shutoff agent are generally lower than those of a profile control agent, and the existing water shutoff agent is easy to flush away by subsequent water drive and has poor water shutoff effect. In addition, the external water shutoff agent cannot be recycled after being injected into the stratum, and the water shutoff cost is higher; the application provides a process and a device for plugging residual oil in situ by mixing and injecting hot fluid in a fractured oil-gas reservoir.
2. Technical scheme
In order to achieve the purpose, the application provides a fractured oil-gas reservoir hot fluid in-situ residual oil water plugging process by mixing injection, the method comprises the steps of carrying out oil-water separation on crude oil to obtain low-water-content crude oil, carrying out oil-residue separation on the low-water-content crude oil to obtain oil residue, carrying out mixing injection dilution on the oil residue to obtain a water plugging agent, mixing high-pressure gas with the water plugging agent to obtain a dispersed injection state water plugging agent, and injecting the dispersed injection state water plugging agent into a stratum.
Another embodiment provided by the present application is: the oil residue separation comprises the steps of pressurizing the low-water-content crude oil to separate the low-water-content crude oil into light oil, upper crude oil and oil residue, collecting the light oil, collecting the upper crude oil, pressurizing the oil residue to mix, inject and dilute the oil residue to obtain a water shutoff agent, mixing the high-pressure gas and the water shutoff agent to obtain a dispersion injection state water shutoff agent, and injecting the dispersion injection state water shutoff agent into a stratum.
Another embodiment provided by the present application is: the light oil is condensed after being volatilized, the condensed light oil is filtered, the filtered light oil is collected after being gathered under the action of gravity, and the light oil on the condensing surface is adopted to scour the oil residue to collect the oil residue.
The application still provides one kind with fissionability oil gas reservoir hot-fluid mix and annotate normal position residual oil water shutoff technology correspond device, including oil water separator, oil residue separation reation kettle and the hot-fluid that communicates in proper order mix and annotate dilution reation kettle.
Another embodiment provided by the present application is: the oil-residue separation reaction kettle comprises a heat insulation reaction cavity, the oil-water separator, the heat insulation reaction cavity and the hot fluid mixing injection dilution reaction kettle are sequentially communicated, an oil collecting scouring assembly is arranged on the heat insulation reaction cavity, and the heat insulation reaction cavity is connected with a separation promoting gas tank.
Another embodiment provided by the present application is: a filter screen is arranged between the heat insulation reaction cavity and the separation promoting gas tank, a window is arranged on the heat insulation reaction cavity, and the heat insulation reaction cavity is communicated with the oil storage tank.
Another embodiment provided by the present application is: the hot fluid mixing, injecting and diluting reaction kettle comprises a hot fluid mixing, injecting and diluting reaction container, the oil-water separator and the heat insulation reaction cavity are sequentially communicated with the hot fluid mixing, injecting and diluting reaction container, the hot fluid mixing, injecting and diluting reaction container is connected with a pressurizing assembly, a stirring structure is arranged in the hot fluid mixing, injecting and diluting reaction container and is connected with a stirring pump machine, and the hot fluid mixing, injecting and diluting reaction container is connected with a stirring promoting assembly.
Another embodiment provided by the present application is: still include heating element, heating element is including the first heater strip, the automatically controlled component of heating and the second heater strip that connect gradually, the automatically controlled component of heating is connected with heat source mechanism, first heater strip set up in thermal-insulated reaction intracavity, the second heater strip set up in the hot-fluid is mixed and is annotated in diluting the reaction vessel.
Another embodiment provided by the present application is: the oil-water separator with be provided with first valve between the thermal-insulated reaction chamber, thermal-insulated reaction chamber with be provided with the second valve between the oil storage tank.
Another embodiment provided by the present application is: the oil-water separator is communicated with the stratum, and the hot fluid stirring and injecting dilution reaction container is communicated with the stratum.
3. Advantageous effects
Compared with the prior art, the fissile oil and gas reservoir hot fluid in-situ residual oil water plugging process and device provided by the application have the beneficial effects that:
the device for blocking the water of the hot fluid in-situ residual oil mixed with the oil and gas in the fractured oil and gas reservoir integrates separation, collection, dilution and redispersion, and is reasonable in design, simple to operate and strong in adaptability.
The application provides a fissile oil gas reservoir hot-fluid is mixed and is annotated normal position residual oil water shutoff technology, the water shutoff agent that makes does not harm the reservoir, recoverable low-cost water shutoff mode of recycling, its water shutoff agent has the viscidity, be difficult for being washed away by follow-up water drive, can play the water shutoff effect for a long time at fissile oil gas reservoir, can also play the jia sensitization effect, get simultaneously in the stratum, be used for the stratum, certain feature of environmental protection has, a section for improving oil well production liquid, reduce the moisture content, improve oil field water injection development effect.
The fractured oil-gas reservoir hot fluid in-situ residual oil mixing and injecting water plugging process is reasonable in design, simple to operate and high in adaptability, crude oil taken from a test area is utilized, in-situ residual oil formed after high-temperature and chemical separation is used as a water plugging agent and is injected back to a stratum again, and the Jamin effect can be exerted.
The application provides a fissile oil gas reservoir hot-fluid is mixed and is annotated normal position residual oil water shutoff technology adopts miniaturized device and hot-fluid mode of carrying, can exert the effect of hot-fluid viscosity reduction, deblocking, improves the water shutoff agent and pours into the degree of depth, can solve current water shutoff agent not good with oil reservoir environment matching nature, has sensitivity and contamination, is easily by the problem of follow-up water drive impact.
Drawings
FIG. 1 is a schematic structural diagram of a fissile hydrocarbon reservoir hot fluid in-situ residual oil water plugging device according to the application;
FIG. 2 is a schematic structural diagram of an oil-residue separation reaction kettle of the present application;
FIG. 3 is a schematic view of a hot fluid-stirred-injection dilution reactor of the present application;
FIG. 4 is a schematic structural diagram of an oil collection flushing assembly of the present application;
fig. 5 is a schematic structural diagram of the canopy type oil collecting piston of the present application.
Detailed Description
Hereinafter, specific embodiments of the present application will be described in detail with reference to the accompanying drawings, and it will be apparent to those skilled in the art from this detailed description that the present application can be practiced. Features from different embodiments may be combined to yield new embodiments, or certain features may be substituted for certain embodiments to yield yet further preferred embodiments, without departing from the principles of the present application.
Referring to fig. 1-5, the application provides a fractured oil-gas reservoir hot fluid stirring injection in-situ residual oil water plugging process, which includes the steps of carrying out oil-water separation on crude oil to obtain low-water-content crude oil, carrying out oil residue separation on the low-water-content crude oil to obtain oil residue, carrying out stirring injection dilution on the oil residue to obtain a water plugging agent, mixing high-pressure gas and the water plugging agent to obtain a dispersion injection state water plugging agent, and injecting the dispersion injection state water plugging agent into a stratum.
After crude oil taken from a test area is input into a device, oil-water separation is carried out on the crude oil through a small-sized oil-water separator 2, then the crude oil with low water content is input into an oil-residue separation reaction kettle 5 through an oil flow pipeline 3 for oil-residue separation, then the separated oil residue flows into a hot fluid mixing and injecting dilution reaction kettle 8 for mixing and injecting dilution, and finally the oil residue after mixing and injecting dilution flows into an injection pipeline 10, so that in-situ residual oil which has viscosity, can exert a Jamin effect, and does not have sensitivity and pollution is obtained and is used as a water plugging agent to be reinjected into a stratum.
Further, the oil residue separation comprises the steps of pressurizing the low-water-content crude oil to separate the low-water-content crude oil into light oil, upper crude oil and oil residue, collecting the light oil, collecting the upper crude oil, pressurizing the oil residue to mix, inject and dilute the oil residue to obtain the water shutoff agent, and mixing high-pressure gas obtained after gas source release and pressurization by a pressurization pump with the water shutoff agent to obtain the dispersed injection-state water shutoff agent to be injected into the stratum.
Furthermore, the light oil is condensed after being volatilized, the condensed light oil is filtered, the filtered light oil is collected after being gathered under the action of gravity, and the light oil on the condensing surface is adopted to scour the oil residue to collect the oil residue.
And (3) flushing the heat-insulating reaction cavity by using the collected light oil, so that the oil residue flows into the hot fluid stirring and injecting dilution reaction kettle.
The application also provides a device corresponding to the fractured oil-gas reservoir hot fluid stirring and injecting in-situ residual oil water plugging process, and the device comprises an oil-water separator 2, an oil-residue separation reaction kettle 5 and a hot fluid stirring and injecting dilution reaction kettle 8 which are sequentially communicated.
Carrying out oil-water separation on the crude oil in an oil-water separator 2, and carrying out oil-residue separation in an oil-residue separation reaction kettle 5; the oil residue is diluted in the hot fluid stirring and injecting reaction kettle 8 and flows into the injection pipeline 10.
Specifically, the input pipeline 1 is communicated with an oil-water separator 2, the oil-water separator 2 is communicated with an oil flow pipeline 3 and a water flow pipeline 4, the water flow pipeline 4 is communicated with an injection pipeline 10, and the oil flow pipeline 3 is communicated with an oil residue separation reaction kettle 5.
Further, the oil residue separation reaction kettle 5 comprises a heat insulation reaction cavity 51, the oil-water separator 2, the heat insulation reaction cavity 51 and the hot fluid stirring and injecting dilution reaction kettle 8 are sequentially communicated, an oil collecting scouring assembly 54 is arranged on the heat insulation reaction cavity 51, and the heat insulation reaction cavity 51 is connected with a separation promoting gas tank 52.
As shown in fig. 4 and 5; the oil collecting and flushing assembly 54 mainly comprises: a linear guide rail 541, an extrusion panel 542, an oil collecting flushing structure 543 and an oil filter 544; the oil collecting flushing structure 543 mainly comprises: a canopy type oil collecting piston 5431, an oil collecting tank body 5432, an oil passing groove 5433 and a spherical spraying structure 5434.
When the oil collecting scouring assembly 54 works, light oil volatilizes and is condensed on the lower surface of the awning oil collecting piston 5431, and solid components contained in the light oil are filtered by the oil filter screen 544; light oil condensed on the lower surface of the canopy type oil collecting piston 5431 is gathered under the action of gravity and flows into the oil collecting tank body 5432 through the oil passing groove 5433; after the oil collecting flushing assembly 54 is started, the linear guide rails 541 drive the canopy type oil collecting piston 5431 below the extrusion panel 542 to move, and the light oil in the oil collecting tank body 5432 is extruded, so that the light oil is uniformly sprayed out through the spherical spraying structure 5434.
The canopy formula collection oil piston 5431 is hopper-shaped structure, and in extrusion panel 542 below evenly distributed, ensures that light oil is fully collected, crosses oil filter screen 544 and adopts 40 mesh/inch's individual layer stainless steel net to be the standard net, crosses oil recess 5433 and be the structure of falling the trapezium, and spherical spraying structure 5434 adopts cyclic annular even spout, guarantees that light oil evenly spouts, ensures to erode the effect.
Further, a filter screen 53 is arranged between the heat insulation reaction chamber 51 and the separation promoting gas tank 52, a window 55 is arranged on the heat insulation reaction chamber 51, and the heat insulation reaction chamber 51 is communicated with the oil storage tank 6.
A honeycomb filter screen is arranged at the joint of the separation promoting gas tank 52 and the heat insulation reaction chamber 51, the right side of the heat insulation reaction chamber 51 is communicated with the oil storage tank 6, and the lower part of the heat insulation reaction chamber is communicated with the hot fluid stirring and injecting dilution reaction kettle 8 through a slag feeding valve. The left side of a heat insulation reaction cavity 51 of the oil residue separation reaction kettle 5 is connected with a separation promoting gas tank 52 through a honeycomb filter screen, and a pressure gauge and a valve are installed on a connecting pipeline.
Specifically, the flow rate of crude oil should be not less than 5m3/d, the input pipeline 1 should have a certain temperature application range, so a high-quality carbon steel pipe is adopted, the inside of the small oil-water separator 2 should have corrosion resistance, so the small oil-water separator is made of a high-molecular composite material, and slag conveying valves are arranged on the oil flow pipeline 3 and the water flow pipeline 4; a slag feeding valve is arranged on a connecting pipeline of the heat insulation reaction cavity 51 and the separation promoting gas tank 52, a filter screen of the separation promoting gas tank, namely a honeycomb filter screen made of a 30-mesh/inch single-layer stainless steel wire mesh is adopted as a filter screen 53, an oil collecting scouring component 54 plays a role in collecting light oil and scouring the heat insulation reaction cavity 51, a window 55 can visually observe the material state in the heat insulation reaction cavity 51, and the separated upper crude oil is ensured to flow into the oil storage tank 6; the lower part of the heat insulation reaction cavity 51 is communicated with the high-temperature high-pressure stirring injection dilution reaction kettle 8 through a slag feeding valve.
Further, the hot fluid mixing, injecting and diluting reaction 8 kettle comprises a hot fluid mixing, injecting and diluting reaction container 81, the oil-water separator 2, the heat insulation reaction cavity 51 and the hot fluid mixing, injecting and diluting reaction container 81 are sequentially communicated, the hot fluid mixing, injecting and diluting reaction container 81 is connected with a pressurizing assembly, a stirring structure 86 is arranged in the hot fluid mixing, injecting and diluting reaction container 81, the stirring structure 86 is connected with a stirring pump 85, and the hot fluid mixing, injecting and diluting reaction container 8 is connected with a stirring promoting assembly.
The pressurizing assembly comprises an air source, the air source 83 is connected with a pressurizing pump 82, the left side of the hot fluid stirring and injecting dilution reaction container 81 is connected with the pressurizing pump 82 through a pressurizing pump filter screen 84, and the pressurizing pump 82 and a connecting pipeline of the hot fluid stirring and injecting dilution reaction container 81 are connected with each otherA control valve and an air pressure gauge are arranged, the filter screen 84 of the pressure pump machine adopts a honeycomb filter screen made of a 30-mesh/inch single-layer stainless steel wire mesh, and the air source 83 of the pressure pump machine 82 is N 2 Or CO 2 The air pressure is not lower than 5 MPa; the right side of the high-temperature and high-pressure mixing injection dilution reaction container 81 is connected with a stirring promotion liquid tank 87 through a mixing and injection gas tank filter screen 88, a pressure gauge and a valve are installed on a connecting pipeline, and liquid in the liquid tank can be toluene or thin oil or other diluting fluids; a stirring structure driven by a stirring pump is arranged in the high-temperature high-pressure stirring and injecting dilution reaction container, and a stirring-promoting liquid tank filter screen 88 is a honeycomb filter screen made of a 30-mesh/inch single-layer stainless steel wire mesh; the lower part of the high-temperature and high-pressure mixing injection dilution reaction vessel 81 passes through a control valve and an injection pipeline 10, and a plunger booster pump 101 is installed on the injection pipeline 10.
Further, still include heating element, heating element is including the first heater strip 71, the automatically controlled component of heating and the second heater strip 72 that connect gradually, the automatically controlled component of heating is connected with heat source mechanism 73, first heater strip 71 set up in thermal-insulated reaction chamber 51, second heater strip 82 set up in hot-fluid is mixed and is annotated in diluting reaction vessel 81.
The heating assembly 7 controls the temperature of the first electric heating wire 71 and the second electric heating wire 72, so that the refining temperature of the oil residue separation reaction kettle 5 is not lower than 500 ℃, the dilution temperature of the hot fluid in the hot fluid stirring, injecting and diluting reaction kettle 8 is not higher than 300 ℃, and the distance between the heating assembly 7 and the heat source mechanism 73 and the oil residue separation reaction kettle 5 and the hot fluid stirring, injecting and diluting reaction kettle 8 is not less than 5 meters.
Further, the oil-water separator 2 and a first valve is arranged between the heat insulation reaction cavity, and a second valve is arranged between the heat insulation reaction cavity and the oil storage tank.
Further, the oil-water separator 2 is communicated with a production pipeline, and the hot fluid mixing injection dilution reaction container 8 is communicated with an injection pipeline.
If the low-water crude oil passing through the oil-water separator 2 reaches the standard, the low-water crude oil is directly injected into the stratum through a pipeline, and if the low-water crude oil does not reach the standard, the low-water crude oil is subjected to oil-residue separation, mixed injection dilution is carried out, and then the mixed injection dilution is injected into the stratum.
Specifically, crude oil is separated from oil and water in a small oil-water separator 2, and oil and slag are separated in an oil-slag separation reaction kettle, and the specific process is as follows: and (3) separating oil from water in the small oil-water separator 2: crude oil enters a small oil-water separator 2 through an input pipeline 1 to realize the primary separation of oil and water, separated water flows into an injection pipeline 10 through a water flow pipeline 4, and separated low water content crude oil flows into an oil residue separation reaction kettle 5 through an oil flow pipeline 3; separating oil and slag in the crude oil in an oil and slag separation reaction kettle 5: in the heat insulation reaction cavity 51, the refining temperature is controlled to be not lower than 500 ℃ by the first electric heating wire 71, and the gas is injected and pressurized in the separation gas tank 52 to separate the crude oil with low water content; the separated upper crude oil flows into the oil storage tank 6, the light oil is collected by the oil collecting scouring assembly 54, then the slag conveying valve is opened, the oil collecting scouring assembly 54 is started to scour the heat insulation reaction cavity 51, and the oil slag flows into the hot fluid stirring and injecting dilution reaction kettle 8; the oil residue is diluted in the hot fluid mixing and injection dilution reaction kettle 8, and flows into the injection pipeline 10, and the specific process is as follows: in the hot fluid mixing, injecting and diluting reaction container 81, a stirring structure 86 is driven by a stirring pump machine 85 to stir, the dilution temperature is controlled by a second electric heating wire 72 to be not higher than 300 ℃, a stirring liquid tank 87 is promoted to carry out catalytic dilution, a pressurizing pump machine 82 is used for further pressurizing, the oil residue is ensured to fully flow in the mixing, injecting and diluting process, and the mixing, injecting and diluting process is ensured to be finished; oil residue inflow into the injection line 10: after the stirring and injection dilution process is finished, the opening mode of the valve is controlled, so that the oil residue after stirring and injection dilution flows into the injection pipeline 10 in a specific form (dripping/flowing), is carried by high-pressure gas, the temperature of the oil residue after stirring and injection dilution is maintained by the external heat-insulating sleeve of the injection pipeline, and the oil residue is pumped into the injection pipeline 10 by the plunger booster pump 101.
The water shutoff agent prepared in the application has viscosity, is not easy to be washed away by follow-up water drive, and can improve the effective period of water shutoff in a fractured oil-gas reservoir. Can exert the Jamin effect. The water shutoff agent is in-situ residual oil which is formed by taking crude oil from a test area and carrying out high-temperature and chemical separation, and is injected back to the stratum again, and the water shutoff agent is taken from the stratum and used to the stratum, has good matching property with the oil reservoir environment, and has no sensitivity and pollution.
The preparation device in this application is miniaturized, adopts the hot-fluid to carry, can improve and carry the effect, and the effect of performance hot-fluid viscosity reduction, deblocking simultaneously can improve the stifled degree of depth of injection of water shutoff agent to realize the unblock increase.
The technical scheme in the application has the advantages of reasonable design, simple and convenient operation, good simulation effect, wide application range and low cost, and effectively solves the problems of poor matching between the existing water shutoff agent and the oil reservoir environment, and sensitivity and pollution by using the crude oil taken from a test area and the in-situ residual oil formed after high-temperature and chemical separation as the water shutoff agent.
The jia sensitization effect is a resistance effect, and the device in this application pours into the oil drop that forms the discreteness into the in-process, is detained in crack or macroporous, and when follow-up water drive got into this crack or macroporous, the oil water distribution of discreteness can increase water drive resistance. Moreover, the capillary resistance is superposed, the numerical value is huge, the water shutoff agent prepared by the method can block a large pore passage, the seepage profile of the fluid is adjusted, and the recovery ratio is improved by increasing the swept volume of the displacement fluid.
Examples
As shown in fig. 1, fig. 2 and fig. 3, the fissile hydrocarbon reservoir hot fluid mixing and injecting in-situ residual oil water plugging device comprises an input pipeline 1, a small oil-water separator 2, an oil flow pipeline 3, a water flow pipeline 4, an oil-residue separation reaction kettle 5, an oil storage tank 6, a heating assembly 7, a hot fluid mixing and injecting dilution reaction kettle 8, a control valve and an injection pipeline 10, wherein a valve 9 is arranged between the injection pipeline 10 and the hot fluid mixing and injecting dilution reaction kettle 8, the input pipeline 1 is connected with the left side of the small oil-water separator 2, the right side of the small oil-water separator 2 is connected with the oil flow pipeline 3, the lower part of the small oil-water separator is connected with the water flow pipeline 4, the water flow pipeline 4 is connected with the injection pipeline 10, and the oil flow pipeline 3 is connected with the left side of the oil-residue separation reaction kettle 5. The oil-slag separation reaction kettle 5 comprises a heat insulation reaction cavity 51, a separation promoting gas tank 52, an oil collecting scouring assembly 54 and a window 55, wherein the oil collecting scouring assembly 54 is positioned at the upper part of the heat insulation reaction cavity 51, a honeycomb filter screen 53 is arranged at the joint of the separation promoting gas tank 52 and the heat insulation reaction cavity 51, the right side of the heat insulation reaction cavity 51 is connected with the oil storage tank 6, the window 55 is positioned near the joint of the heat insulation reaction cavity 51 and the heat insulation reaction cavity 51, and the lower part of the heat insulation reaction cavity 51 is communicated with the hot fluid stirring and injecting dilution reaction kettle 8 through a slag conveying valve. The hot fluid mixing and injecting dilution reaction kettle 8 comprises a hot fluid mixing and injecting dilution reaction container 81, a pressurizing pump 82, an air source 83, a stirring pump 85, a stirring structure 86 and a stirring promoting liquid tank 87, wherein a honeycomb filter screen 84 is arranged at the joint of the air source 83 and the hot fluid mixing and injecting dilution reaction container 81, a honeycomb filter screen 88 is arranged at the joint of the stirring promoting liquid tank 87 and the hot fluid mixing and injecting dilution reaction container 81, the left side and the lower part of the hot fluid mixing and injecting dilution reaction container 81 are respectively communicated with an injection pipeline 10, and a plunger booster pump 101 is arranged on the injection pipeline 10 at the lower part. The heating assembly 7 comprises a first heating wire 71, a second heating wire 72 and a heat source mechanism 73, wherein the upper heating wire 71 controls the refining temperature in the oil-residue separation reaction kettle 5, and the second heating wire 72 controls the dilution temperature in the hot fluid stirring and injecting dilution reaction kettle 8.
Although the present application has been described above with reference to specific embodiments, those skilled in the art will recognize that many changes may be made in the configuration and details of the present application within the principles and scope of the present application. The scope of protection of the application is determined by the appended claims, and all changes that come within the meaning and range of equivalency of the technical features are intended to be embraced therein.
Claims (10)
1. A fractured oil-gas reservoir hot fluid stirring and injecting in-situ residual oil water plugging process is characterized by comprising the following steps: the method comprises the steps of carrying out oil-water separation on crude oil to obtain low-water-content crude oil, carrying out oil-residue separation on the low-water-content crude oil to obtain oil residue, carrying out stirring injection dilution on the oil residue to obtain a water plugging agent, mixing high-pressure gas and the water plugging agent to obtain a dispersed injection state water plugging agent, and injecting the dispersed injection state water plugging agent into a stratum.
2. The fractured hydrocarbon reservoir hot fluid-stirred-injection in-situ residual oil water plugging process as claimed in claim 1, which is characterized in that: the oil residue separation comprises the steps of pressurizing the low-water-content crude oil to separate the low-water-content crude oil into light oil, upper crude oil and oil residue, collecting the light oil, collecting the upper crude oil, pressurizing the oil residue to mix, inject and dilute the oil residue to obtain a water shutoff agent, mixing the high-pressure gas and the water shutoff agent to obtain a dispersion injection state water shutoff agent, and injecting the dispersion injection state water shutoff agent into a stratum.
3. The fractured hydrocarbon reservoir hot fluid-stirred-injection in-situ residual oil water plugging process as claimed in claim 2, wherein the process comprises the following steps: the light oil is condensed after being volatilized, the condensed light oil is filtered, the filtered light oil is collected after being gathered under the action of gravity, and the light oil on the condensing surface is adopted to scour the oil residue to collect the oil residue.
4. The device corresponding to the fractured hydrocarbon reservoir hot fluid in-situ residual oil water plugging process in claim 1-3 is characterized in that: the device comprises an oil-water separator, an oil-residue separation reaction kettle and a hot fluid mixing and injecting dilution reaction kettle which are sequentially communicated.
5. The fissile hydrocarbon reservoir hot fluid-stirred-injection in-situ residual oil water plugging device as claimed in claim 4, wherein: the oil-residue separation reaction kettle comprises a heat insulation reaction cavity, the oil-water separator, the heat insulation reaction cavity and the hot fluid mixing injection dilution reaction kettle are sequentially communicated, an oil collecting scouring assembly is arranged on the heat insulation reaction cavity, and the heat insulation reaction cavity is connected with a separation promoting gas tank.
6. The fissile hydrocarbon reservoir hot fluid-stirred-injection in-situ residual oil water plugging device as claimed in claim 5, wherein: a filter screen is arranged between the heat insulation reaction cavity and the separation promoting gas tank, a window is arranged on the heat insulation reaction cavity, and the heat insulation reaction cavity is communicated with the oil storage tank.
7. The fissile hydrocarbon reservoir hot fluid-stirred-injection in-situ residual oil water plugging device as claimed in claim 6, wherein: the hot fluid mixing, injecting and diluting reaction kettle comprises a hot fluid mixing, injecting and diluting reaction container, the oil-water separator and the heat insulation reaction cavity are sequentially communicated with the hot fluid mixing, injecting and diluting reaction container, the hot fluid mixing, injecting and diluting reaction container is connected with a pressurizing assembly, a stirring structure is arranged in the hot fluid mixing, injecting and diluting reaction container and is connected with a stirring pump machine, and the hot fluid mixing, injecting and diluting reaction container is connected with a stirring promoting assembly.
8. The fissile hydrocarbon reservoir hot fluid-stirred-injection in-situ residual oil water plugging device as claimed in claim 7, wherein: still include heating element, heating element is including the first heater strip, the automatically controlled component of heating and the second heater strip that connect gradually, the automatically controlled component of heating is connected with heat source mechanism, first heater strip set up in thermal-insulated reaction intracavity, the second heater strip set up in the hot-fluid is mixed and is annotated in diluting the reaction vessel.
9. The fissile hydrocarbon reservoir hot fluid-stirred-injection in-situ residual oil water plugging device as claimed in claim 8, wherein: the oil-water separator with be provided with first valve between the thermal-insulated reaction chamber, thermal-insulated reaction chamber with be provided with the second valve between the oil storage tank.
10. The fractured hydrocarbon reservoir hot fluid in-situ residual oil water plugging device according to any one of claims 6 to 9, wherein: the oil-water separator is communicated with the stratum, and the hot fluid stirring and injecting dilution reaction container is communicated with the stratum.
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