CN102359363A - New cold-mining technology for visbreaking thick oil by circulating reinjection of viscosity breaking agent between small well groups - Google Patents
New cold-mining technology for visbreaking thick oil by circulating reinjection of viscosity breaking agent between small well groups Download PDFInfo
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- CN102359363A CN102359363A CN2011102637612A CN201110263761A CN102359363A CN 102359363 A CN102359363 A CN 102359363A CN 2011102637612 A CN2011102637612 A CN 2011102637612A CN 201110263761 A CN201110263761 A CN 201110263761A CN 102359363 A CN102359363 A CN 102359363A
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Abstract
The invention relates to a new cold-mining technology for visbreaking thick oil by the circulating reinjection of viscosity breaking agent between small well groups. According to the technical scheme, the new cold-mining technology comprises the following steps of: (1) injecting a viscosity breaking agent with corresponding effect into a stratum containing thick oil by a water injection well, so that the viscosity breaking agent flows together with water flow to a thick oil surface under the drive of water injected from the water injection well and surface-layer thick oil is emulsified by the viscosity breaking agent; (2) enabling the thick oil subjected to viscosity breaking to enter places near a plurality of production wells together with water, and pumping the thick oil containing the viscosity breaking agent and subjected to viscosity breaking and water in the layer onto the ground by an oil extraction pump of each production well; and (3) entering an oil-water separation station via a pipeline, and injecting the water containing the viscosity breaking agent back into the stratum containing the thick oil by the water injection well after oil-water separation. The new cold-mining technology has the beneficial effect that bidirectional action based on the huff and puff effect of the viscosity breaking agent and the driving effect of agent-containing water injected back is used for continuously impacting the thick oil layer in a circulating manner and pushing an emulsion layer to move. The new cold-mining technology has the advantages of strong permeability, wide application range, low cost and high benefit, and is simple to operate and is, energy-saving, safe and environmentally-friendly, and the viscosity breaking agent can be recycled.
Description
Technical field:
The present invention relates to a kind of thickened oil recovery technology, with thinner circulation re-injection viscous crude is carried out the cold new technology of adopting of viscosity reduction between particularly a kind of little well group.
Background technology:
Heating exploitation is traditional thickened oil recovery method, and its technological core is through oil reservoir or pit shaft being heated to reduce viscosity of crude, improving the mobile performance of crude oil, to reach the purpose that improves oil well output.Mainly contain methods such as steam injection, accompanying-heat cable, down-hole heating furnace, heating sucker rod, combustion in situ.Show that through production practices for many years its technology is maturation day by day, but the ubiquity investment is high, high to the requirement of down-hole technology status, water at the bottom of thin layer, mutual thin layer oil reservoir and the limit is enlivened problems such as oil reservoir bad adaptability.Therefore, the technician who is engaged in thickened oil recovery with diversion to the research of heavy oil cold flow production with use.
Heavy oil cold flow production is meant the process of using conventional oil well pump and various non-thermal methods heavy crude producings, mainly contains methods such as pit shaft dosing, chemical plugging removal, screw pump, suction pump, air injection, notes nitrogen, caustic waterflooding.What wherein, the present invention relates to is the cold excavating technology of thinner.Existing processes mainly is to adopt individual well to inject the cold excavating technology of thinner; Though thinner has played the effect of shearing the viscous crude macromolecular chain, make the part viscous crude by emulsification after extraction, still there is a lot of defectives in the cold excavating technology of this individual well injection thinner; Situation from experiment; The medicament that front end injects has touched the viscous crude of oil reservoirs, expected the effect of estimating, and back 70% medicament has only played the effect that promotes the front end medicament; And itself does not really touch the viscous crude in the oil reservoirs, does not have corresponding viscosity reduction effect; Here it is, and the initial stage that why drives a well at first extracts out is to contain thinner liquid reason in a large number.Using thinner to carry out single well stimulation method heavy oil cold flow production produces effect; But same confirmable is to have played viscosity reducing effect because the thinner of injection down-hole has only fraction to touch viscous crude; Also have and do not touch viscous crude greatly; Also just do not play a role, therefore, this method exists cost to reach inefficient problem greatly.
Summary of the invention:
The object of the invention is exactly the above-mentioned defective that exists to prior art; The cold new technology of adopting of viscous crude being carried out viscosity reduction with thinner circulation re-injection is provided between a kind of little well group; Through changing the method for implanting of thinner; The production technology that more renews makes the viscosity reduction medicament abundant contact target of having an opportunity, thereby reaches the best cold effect of adopting.
Technical scheme of the present invention is to comprise following production stage:
(1), according to the reservoir description data of target block, confirm the comprehensive mining scheme of whole heavy oil block, the well location of producing well and water injection well is carried out rational deployment, the make rational planning for position of water injection well and producing well of the just existing well location of having exploited;
(2), on ground, build corresponding scale oil field underground produced water treatment system, thinner add-on system, produced-water reinjection system, form medicament water open circulation loop, above and below ground;
(3), concrete technological process is following: in re-injection water, add thinner; Inject oil reservoirs through water injection well; Through the infiltration on stratum, pass through, a series of processes such as emulsification, the displacement of reservoir oil; The mixed liquor that will contain crude oil, sewage, thinner drives near producing well, again through in oil pumper or the oil extraction pump the underground recovered water in these oil fields being proposed from the shaft bottom, after the separation of water-oil separating station and proposing crude oil
WillThe re-injection water that contains thinner is from newly being recycled into the oil reservoirs; Take out not closed circulation loop of formation ground, underground medicament water through water filling and pump; Re-injection in water injection well proposes from producing well, and in the water-oil separating station, isolates the underground recovered water in the oil field that contains thinner of crude oil; So repeatedly; Make the re-injection water that contains thinner constantly carry out the cyclic flusher viscosity reduction to the viscous crude in the oil reservoirs, thereby, the purpose of realization heavy oil cold flow production.
When thinner concentration is on the low side in the re-injection water, in re-injection water, replenish an amount of thinner again through the thinner add-on system, inject well after making it to reach valid density; So back and forth; The thinner content of this regional recirculated water will reach a stability number, and thinner can be constantly surperficial through viscous crude with current, not the ablactation viscous crude; Play the reducing viscosity by emulsifying effect, and then the more viscous crude of extraction.
Above-mentioned thinner add-on system mainly is made up of liquid injection port, agitator, thinner fluid reservoir and fluid flowmeter, and the top of described thinner fluid reservoir is provided with liquid injection port, and inner chamber runs through agitator, in the bottom of thinner fluid reservoir the fluid flowmeter is installed.
The invention has the beneficial effects as follows: inject the re-injection water that contains thinner from water injection well,, or use from water injection well and inject the liquid that contains thinner in conjunction with the direct method of handling up of injecting thinner from individual well; Form water drive oil, the emulsification viscous crude combines individual well heavy crude heat extraction technology again; Both combine to form best oil recovery effect, utilize the combination of multiple technologies, realize best heavy oil cold flow production effect; Having changed the method for handling up of from individual well, directly injecting thinner, is the technological new breakthrough of heavy oil cold flow production.In addition, it is simple to operate, permeability is strong, and the application region is wide, medicament can be recycled, and energy-conservation, safety, environmental protection, cost is low, income is big.
Description of drawings:
Accompanying drawing 1 is a schematic diagram of the present invention;
Accompanying drawing 2 is process schematic representations of the present invention;
Accompanying drawing 3 is thinner circular flow schematic flow sheets of the present invention;
Accompanying drawing 4 is structure charts of thinner add-on system of the present invention;
Among the last figure: water injection well 1, thinner 2, thinner add-on system 3, water-oil separating station 4, producing well 5, flowline 6; Liquid injection port 3.1, agitator 3.2, thinner fluid reservoir 3.3, fluid flowmeter 3.4.
The specific embodiment:
In conjunction with accompanying drawing 1-4, the present invention is done further description:
(1), according to the reservoir description data of target block, confirm the comprehensive mining scheme of whole heavy oil block, the well location of producing well and water injection well is carried out rational deployment, the make rational planning for position of water injection well and producing well of the just existing well location of having exploited;
(2), on ground, build corresponding scale oil field underground produced water treatment system, thinner add-on system, produced-water reinjection system, form medicament water open circulation loop, above and below ground;
(3), concrete technological process is following: the thinner 2 that injects corresponding effect through water injection well 1 to the stratum that contains viscous crude; Utilize the water of water injection well water filling to push away effect, thinner 2 is flowed there through the viscous crude surface with water, thinner can be with the top layer emulsified viscous oil; Viscous crude behind the viscosity reduction again with water get into a plurality of producing wells 5 near; Oil extraction pump through each producing well is extracted into the viscous crude and the water that contain in this layer behind thinner, the viscosity reduction on the ground together again, gets into water-oil separating station 4 through pipeline, after the water-oil separating; Oil is discharged through flowline 6, and the water that will contain thinner is recycled in the stratum that contains viscous crude through water injection well 1; When thinner concentration is on the low side in the re-injection water, replenish an amount of thinner again through thinner add-on system 3; Inject well after making it to reach valid density, so back and forth, the thinner content of this regional recirculated water will reach a stability number; Thinner can be constantly surperficial through viscous crude with current; The ablactation viscous crude does not play the reducing viscosity by emulsifying effect, thus the more viscous crude of extraction.
Above-mentioned thinner add-on system 3 mainly is made up of liquid injection port 3.1, agitator 3.2, thinner fluid reservoir 3.3 and fluid flowmeter 3.4; The top of described thinner fluid reservoir 3.3 is provided with liquid injection port 3.1; Inner chamber runs through agitator 3.2, in the bottom of thinner fluid reservoir 3.3 fluid flowmeter 3.4 is installed.
Contain surface active agent and synergist in the thinner that this programme uses; Be well-known to those skilled in the art; It or not innovative point of the present invention; Innovative point of the present invention is the cold new technology of adopting, and it has changed the method for handling up of in the past from individual well, directly injecting thinner, and is a kind of great revolutionary character innovation; Pass through the interaction of colloid, asphaltene molecules in thinner molecule and the viscous crude on the one hand; And very strong infiltration, peptizaiton, break the overlapping aggregation of piling up, the macromolecular structure in the viscous crude is transformed to lower level by higher level; Thereby the decentralization of viscous crude system is increased; Supramolecular structure size in the system reduces, and utilizes the amphipathic characteristic of surfactant on the other hand, makes emulsified viscous oil reduce oil water interfacial tension; Form stable O/W type emulsion, reach the purpose that reduces viscosity of thickened oil significantly;
The thinner that this programme uses is water miscible, does not have suspended particulate, does not form floccule, can with the sewage compatibility in target exploiting field so that when carrying out water-oil separating, go out with elutriation, thereby, make thinner can reach the purpose that recycles.
Scope of application thinner must drop to the viscous crude of viscosity at 1000MPa.s to 10000MPa.s about 100MPa.s to 3000mpa.s.
With reference to following table, thinner is a technology well known to those of ordinary skill in the art, introduces the composition of each composition no longer in detail:
In general, a bite water injection well can carry out water filling to a plurality of producing wells of a heavy oil block and Different Strata, and the zone of action is bigger; The water filling stroke is long, the producing well that distance is far away, and viscosity reducing effect manifests may be not obvious; Therefore, for some such producing well, also can directly inject thinner to it; This direct injection of handling up is because the stroke distances of thinner is short; Can more effectively play the viscosity reduction effect to the heavy oil tested layer in the producing well zone, the thinner that injects in conjunction with water injection well forms the formation of the viscous crude behind viscosity reduction displacement of reservoir oil effect at oil reservoirs, and this two-way injection method can play better reducing thick oil viscosity effect.
The present invention carries out the cold new technology of adopting of cyclic flusher method viscosity reduction to whole heavy oil block through a bite water injection well; It is the effect of utilizing surfactant in the thinner; Recirculated water with containing thinner washes the viscous crude in the oil reservoirs repeatedly; With the viscous crude top layer repeatedly, emulsification in layer, thereby with the viscous crude extraction; It has combined from individual well, directly to inject the method for handling up of thinner, or uses from water injection well and inject the liquid that contains thinner, forms water drive oil; The emulsification viscous crude; Combine individual well heavy crude heat extraction technology again, both combine to form best oil recovery effect, utilize the combination of multiple technologies; Realize best heavy oil cold flow production effect, this method will become the another technology new breakthrough of heavy oil cold flow production.
Claims (3)
1. with thinner circulation re-injection viscous crude is carried out the cold new technology of adopting of viscosity reduction between a little well group, it is characterized in that comprising following production stage:
(1), according to the reservoir description data of target block, confirm the comprehensive mining scheme of whole heavy oil block, the well location of producing well and water injection well is carried out rational deployment, the make rational planning for position of water injection well and producing well of the just existing well location of having exploited;
(2), on ground, build corresponding scale oil field underground produced water treatment system, thinner add-on system, produced-water reinjection system, form medicament water open circulation loop, above and below ground;
(3), concrete technological process is following; In re-injection water, add thinner; Inject oil reservoirs through water injection well; Through the infiltration on stratum, pass through, a series of processes such as emulsification, the displacement of reservoir oil; The mixed liquor that will contain crude oil, sewage, thinner drives near producing well, again through in oil pumper or the oil extraction pump the underground recovered water in these oil fields being proposed from the shaft bottom, through the water-oil separating station separate and the re-injection water that proposes will contain thinner behind the crude oil from newly being recycled into the oil reservoirs; Take out not closed circulation loop of formation ground, underground medicament water through water filling and pump; Re-injection in water injection well proposes from producing well, and in the water-oil separating station, isolates the underground recovered water in the oil field that contains thinner of crude oil; So repeatedly; Make the re-injection water that contains thinner constantly carry out the cyclic flusher viscosity reduction to the viscous crude in the oil reservoirs, thereby, the purpose of realization heavy oil cold flow production.
2. with thinner circulation re-injection viscous crude is carried out the cold new technology of adopting of viscosity reduction between little well group according to claim 1; It is characterized in that: when thinner concentration is on the low side in the re-injection water in the step (3), in re-injection water, replenish an amount of thinner again, inject well after making it to reach valid density through the thinner add-on system; So back and forth; The thinner content of this regional recirculated water will reach a stability number, and thinner can be constantly surperficial through viscous crude with current, not the ablactation viscous crude; Play the reducing viscosity by emulsifying effect, and then the more viscous crude of extraction.
3. with thinner circulation re-injection viscous crude is carried out the cold new technology of adopting of viscosity reduction between little well group according to claim 1 and 2; It is characterized in that: described thinner add-on system (3) mainly is made up of liquid injection port (3.1), agitator (3.2), thinner fluid reservoir (3.3) and fluid flowmeter (3.4); The top of described thinner fluid reservoir (3.3) is provided with liquid injection port (3.1); Inner chamber runs through agitator (3.2), in the bottom of thinner fluid reservoir (3.3) fluid flowmeter (3.4) is installed.
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| CN111520118A (en) * | 2020-06-12 | 2020-08-11 | 西南石油大学 | Recyclable heavy oil recovery method and system for heating injected solvent underground |
| CN112610195A (en) * | 2020-12-03 | 2021-04-06 | 中海油田服务股份有限公司 | Experimental device and method for physically simulating energy supplement in heavy oil thermal recovery |
| CN113279728A (en) * | 2021-06-04 | 2021-08-20 | 中国地质科学院勘探技术研究所 | Medium-deep geothermal energy closed heat exchange structure and process method thereof |
| CN114033342A (en) * | 2020-07-21 | 2022-02-11 | 中国石油化工股份有限公司 | Viscosity reduction driving method for realizing effective use of deep low-permeability thickened oil |
| CN114439440A (en) * | 2020-11-03 | 2022-05-06 | 中国石油化工股份有限公司 | Viscosity reduction pressure flooding method for deep low-permeability heavy oil reservoir |
| CN115045642A (en) * | 2022-05-20 | 2022-09-13 | 常州大学 | Well and oil well push-pull linkage thickened oil exploitation method |
| CN115387767A (en) * | 2021-05-20 | 2022-11-25 | 中国石油化工股份有限公司 | Steam huff-puff effect-inducing superposition viscosity reducer flooding method for deep extra-heavy oil reservoir |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111520118A (en) * | 2020-06-12 | 2020-08-11 | 西南石油大学 | Recyclable heavy oil recovery method and system for heating injected solvent underground |
| CN114033342A (en) * | 2020-07-21 | 2022-02-11 | 中国石油化工股份有限公司 | Viscosity reduction driving method for realizing effective use of deep low-permeability thickened oil |
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| CN112610195A (en) * | 2020-12-03 | 2021-04-06 | 中海油田服务股份有限公司 | Experimental device and method for physically simulating energy supplement in heavy oil thermal recovery |
| CN112610195B (en) * | 2020-12-03 | 2022-09-06 | 中海油田服务股份有限公司 | Experimental device and method for physically simulating energy supplement in heavy oil thermal recovery |
| CN115387767A (en) * | 2021-05-20 | 2022-11-25 | 中国石油化工股份有限公司 | Steam huff-puff effect-inducing superposition viscosity reducer flooding method for deep extra-heavy oil reservoir |
| CN113279728A (en) * | 2021-06-04 | 2021-08-20 | 中国地质科学院勘探技术研究所 | Medium-deep geothermal energy closed heat exchange structure and process method thereof |
| CN115045642A (en) * | 2022-05-20 | 2022-09-13 | 常州大学 | Well and oil well push-pull linkage thickened oil exploitation method |
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Application publication date: 20120222 |