CN107143319A - The cold method adopted of shallow oil reservoir reducing thick oil viscosity - Google Patents
The cold method adopted of shallow oil reservoir reducing thick oil viscosity Download PDFInfo
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- CN107143319A CN107143319A CN201710517381.4A CN201710517381A CN107143319A CN 107143319 A CN107143319 A CN 107143319A CN 201710517381 A CN201710517381 A CN 201710517381A CN 107143319 A CN107143319 A CN 107143319A
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- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
Abstract
It is a kind of cold method adopted of shallow oil reservoir reducing thick oil viscosity the present invention relates to heavy oil development technical field, this method is carried out in the steps below：The first step, it is first determined oil reservoir has following feature：Ground viscosity of crude is 50mPa.s to 20000mPa.s at 20 DEG C, and acid value of thick oil is 0.6mgKOH/g to 2.3mgKOH/g, and core intersection is more than 5m, and heavy crude reservoir buried depth is less than 800m, and oil reservoir porosity is more than 15%, and permeability is more than 50 × 10‑3μm2, oil reservoir is anti-rhythm stratum.The exploitation of shallow oil reservoir is carried out using the inventive method, compared to steam drive development cost reduction by 28% to 36%, due to carrying out the exploitation of shallow oil reservoir without modes such as use steam drives, therefore the problem of development late stage channeling and " onlap " phenomenon are serious, later stage steam injection utilization ratio is low is also not present, simultaneously, due to combustion gas need not be used, also without the steam of production high temperature, therefore, also will not occur the security incidents such as the bursting of boilers, high temperature scald, also greenhouse gases will not be produced, and compared to steam drive development, yield is also further improved.
Description
Technical field
It is a kind of cold method adopted of shallow oil reservoir reducing thick oil viscosity the present invention relates to heavy oil development technical field.
Background technology
The traditional approach of shallow heavy oil development is that steam soak or steam drive, and its technological core is heated oil reservoir to reach
Reduce viscosity of crude, improve the purpose of crude oil fluidity.By years of researches and field practice, steam soak or steam drive
Technology is ripe day by day, but generally existing investment is high, development cost is high, development late stage channeling and " onlap " phenomenon is serious, the later stage
The low problem of steam injection utilization ratio, due to carrying out the exploitation of oil reservoir using modes such as steam drives, easily occurs the bursting of boilers, high temperature
The security incidents such as scald, and combustion gas also easily produces greenhouse gases, it is also unfavorable to environment.Current viscosity is less than 20000mPa.s
Shallow oil reservoir account for the 5% of the total oil reservoir in Xinjiang, it is big to develop this part oil reservoir cost with steam soak or steam flooding technology, still
Also nobody expects developing this part oil reservoir with cold mining method at present.
The content of the invention
The invention provides a kind of cold method adopted of shallow oil reservoir reducing thick oil viscosity, the deficiency of above-mentioned prior art is overcome,
It can effectively solve steam soak or steam flooding technology exploitation viscosity be less than 20000mPa.s shallow oil reservoir exist investment it is high,
Development cost is high, development late stage channeling and " onlap " phenomenon are serious, later stage steam injection utilization ratio is low, security risk in development process
High the problem of.
The technical scheme is that realized by following measures：A kind of cold side adopted of shallow oil reservoir reducing thick oil viscosity
Method, is carried out in the steps below：The first step, it is first determined oil reservoir has following feature：Ground viscosity of crude is 50mPa.s at 20 DEG C
To 20000mPa.s, acid value of thick oil is 0.6mgKOH/g to 2.3mgKOH/g, and core intersection is more than 5m, heavy crude reservoir buried depth
Less than 800m, oil reservoir porosity is more than 15%, and permeability is more than 50 × 10-3μm2, oil reservoir is anti-rhythm stratum, and stratigraphic dip is 2 °
To 10 °, Well Pattern And Spacing is less than 300m, and well pattern is anti-9 points or inverted five spot well pattern；Second step, prepares and is applied to have such as
The alkaline displacement of reservoir oil viscosity reduction agent solution of the oil reservoir of characteristics of reservoirs described in the first step, the alkaline displacement of reservoir oil viscosity reduction agent solution includes 1% to 5%
Thinner, the water of 0.1% to 60% alkaline matter and surplus；3rd step, using high-pressure pump by 0.01 times of formation pore volume
Alkaline displacement of reservoir oil viscosity reduction agent solution to 0.5 times of formation pore volume injects oil reservoir, then injects 0.05 times of stratum using high-pressure pump
Pore volume to the water of 1.5 times of formation pore volumes is developed.
Here is the further optimization and/or improvements to foregoing invention technical scheme：
Above-mentioned water is clear water or oilfield sewage.
Above-mentioned alkaline matter is alkali or urea.
It is above-mentioned when alkaline matter is alkali, alkali is one kind in sodium carbonate, sodium acid carbonate, sodium hydroxide, and its consumption accounts for alkali
The 0.1% to 3% of property displacement of reservoir oil viscosity reduction agent solution.
It is above-mentioned when alkaline matter be urea when, its consumption accounts for the 10% to 60% of alkaline displacement of reservoir oil viscosity reduction agent solution.
The exploitation of shallow oil reservoir is carried out using the inventive method, 28% to 36% is reduced compared to steam drive development cost, by
In the exploitation that shallow oil reservoir is carried out without modes such as use steam drives, therefore also in the absence of development late stage channeling and " onlap " phenomenon
Seriously, the problem of later stage steam injection utilization ratio is low, simultaneously as combustion gas need not be used, it is not required that the steam of production high temperature,
Therefore, will not also occur the security incidents such as the bursting of boilers, high temperature scald, will not also produce greenhouse gases, and compared to steam
Exploitation is driven, yield is also further improved.
Embodiment
The present invention is not limited by following embodiments, can technique according to the invention scheme and actual conditions it is specific to determine
Embodiment.Various chemical reagent and chemical article are previously mentioned in the present invention unless otherwise specified, is known in existing technology
Public chemical reagent and chemical article；Percentage in the present invention is as being mass percent without specified otherwise；The present invention
If in solution without specified otherwise, be the aqueous solution that solvent is water, for example, hydrochloric acid solution is aqueous hydrochloric acid solution；This hair
Normal temperature in bright refers generally to 15 DEG C to 25 DEG C of temperature, is commonly defined as 25 DEG C.
With reference to embodiment, the invention will be further described：
Embodiment 1, the cold method adopted of the shallow oil reservoir reducing thick oil viscosity is carried out in the steps below：The first step, it is first determined oil reservoir has
There is following feature：At 20 DEG C ground viscosity of crude be 50mPa.s to 20000mPa.s, acid value of thick oil be 0.6mgKOH/g extremely
2.3mgKOH/g, core intersection is more than 5m, and heavy crude reservoir buried depth is less than 800m, and oil reservoir porosity is more than 15%, and permeability is big
In 50 × 10-3μm2, oil reservoir is anti-rhythm stratum, and stratigraphic dip is 2 ° to 10 °, and Well Pattern And Spacing is less than 300m, and well pattern is anti-
9 points or inverted five spot well pattern；Second step, prepares the alkalescence drive for being applied to the oil reservoir with the characteristics of reservoirs as described in the first step
Oily viscosity reduction agent solution, the alkaline displacement of reservoir oil viscosity reduction agent solution includes 1% to 5% thinner, 0.1% to 60% alkaline matter and surplus
Water；3rd step, using high-pressure pump by the alkaline displacement of reservoir oil thinner of 0.01 times of formation pore volume to 0.5 times of formation pore volume
Solution injects oil reservoir, and the water for then injecting 0.05 times of formation pore volume to 1.5 times of formation pore volumes using high-pressure pump is carried out
Exploitation.
The exploitation of shallow oil reservoir is carried out according to modes such as steam drives, in engineering early stage, it is necessary to build boiler steam room, post
Pump etc. is filled in, and the expenses such as combustion gas expense, the electricity charge can be produced in the process of running, and uses the inventive method to carry out shallow oil reservoir
Exploitation, only need to put into plunger pump and the electricity charge, compared to steam drive development cost reduction by 28% to 36%, because no use steam drives
Etc. the exploitation that mode carries out shallow oil reservoir, therefore also it is not present that development late stage channeling and " onlap " phenomenon be serious, later stage steam injection profit
With efficiency it is low the problem of；Meanwhile, the exploitation of shallow oil reservoir is carried out using the inventive method, due to combustion gas need not be used, also not
The steam of production high temperature is needed, therefore, such as bursting of boilers, high temperature are scalded these safety problems and can avoided.
Embodiment 2, water is clear water or oilfield sewage.
Embodiment 3, alkaline matter is alkali or urea.
Embodiment 4, when alkaline matter is alkali, alkali is one kind in sodium carbonate, sodium acid carbonate, sodium hydroxide, its consumption
Account for the 0.1% to 3% of alkaline displacement of reservoir oil viscosity reduction agent solution.
Embodiment 5, when alkaline matter is urea, its consumption accounts for the 10% to 60% of alkaline displacement of reservoir oil viscosity reduction agent solution.
The present invention is compared to the difference of general reducing thick oil viscosity technology：General reducing thick oil viscosity technology is as auxiliary using thinner
Help medicament to use and oil well is injected or be directly injected into steam, closing well reaction（Stewing well）Afterwards, oil well, which drives a well, continues to produce, using similar
The development scheme of steam soak is, it is necessary to many interruptions, long interruption injection；It is first and the present invention uses similar thin oil waterflooding extraction pattern
First inject and continue, 0.01 times of formation pore volume is constantly injected into well to the alkaline displacement of reservoir oil thinner of 0.5 times of formation pore volume
Solution, the clear water or oilfield sewage for then reinjecting 0.05 times of formation pore volume to 1.5 times of formation pore volumes is developed,
So as to change the development scheme of viscous crude completely, steam exploitation is substituted completely, heavy oil development cost is reduced, recovery ratio is improved.
The present invention, targetedly using alkaline displacement of reservoir oil viscosity reduction agent solution, utilizes high-pressure pump according to oil reservoir and viscous crude property
Oil reservoir is injected into, viscosity of thickened oil is reduced, viscous crude mobility in the earth formation is improved, reduces heavy oil development cost, oil reservoir is improved and adopts
Yield.
Specific embodiment：
The implementation result of the present invention is carried out exemplified by being tested in the heavy crude reservoir of Karamay Oil Fields in Xinjiang Ke Qian10 wellblocks：
The feature of the neat ancient group heavy crude reservoir in gram shallow 10 wellblock is：Average buried depth 340m, 3 ° to 10 ° of stratigraphic dip, at 20 DEG C
Ground viscosity of crude is 2000 mPa.s to 16000mPa.s, and reservoir temperature is 25.3 DEG C, and original formation pressure 3.42MPa is thick
Oily acid value be 0.86 mgKOH/g to 2.01 mgKOH/g, oil reservoir average pore 26.7%, mean permeability 1635 ×
10-3μm2, belong to normal temperature, normal pressure common heavy oil reservoir.Recovery method is as follows：
（1）Treat that formation temperature drops to 25 DEG C or so of prime stratum temperature.
（2）3464m3 alkaline displacement of reservoir oil viscosity reduction agent solution, its neutral and alkali displacement of reservoir oil thinner are injected to oil reservoir using high-pressure pump
The water of sodium carbonate, 2.5% thinner and surplus that the composition of solution is 2%.
（3）Using high-pressure pump 3000m3 oilfield sewages, displacement crude oil are injected to oil reservoir.
During being adopted using the reducing thick oil viscosity of the present invention is cold, oil well produced liquid temperature drops to 20 DEG C to 30 DEG C, adopts
Go out crude oil and do not occur the difficult situation of lifting in the wellbore.3 well groups test 2 tons of month to date oil-producing more than 400, compared to steaming
Vapour drives the stage, and oil production improves 58.9%.
Above technical characteristic constitutes embodiments of the invention, and it has stronger adaptability and implementation result, can basis
The non-essential technical characteristic of increase and decrease is actually needed, to meet the demand of different situations.
Claims (5)
1. a kind of cold method adopted of shallow oil reservoir reducing thick oil viscosity, it is characterised in that carry out in the steps below：The first step, it is first determined
Oil reservoir has following feature：Ground viscosity of crude is 50mPa.s to 20000mPa.s at 20 DEG C, and acid value of thick oil is 0.6mgKOH/g
To 2.3mgKOH/g, core intersection is more than 5m, and heavy crude reservoir buried depth is less than 800m, and oil reservoir porosity is more than 15%, permeability
More than 50 × 10-3μm2, oil reservoir is anti-rhythm stratum, and stratigraphic dip is 2 ° to 10 °, and Well Pattern And Spacing is less than 300m, and well pattern is
Anti- 9 points or inverted five spot well pattern；Second step, prepares the alkalescence for being applied to the oil reservoir with the characteristics of reservoirs as described in the first step
Displacement of reservoir oil viscosity reduction agent solution, the alkaline displacement of reservoir oil viscosity reduction agent solution includes 1% to 5% thinner, 0.1% to 60% alkaline matter and remaining
The water of amount；3rd step, using high-pressure pump by the alkaline displacement of reservoir oil viscosity reduction of 0.01 times of formation pore volume to 0.5 times of formation pore volume
Agent solution injects oil reservoir, and the water for then injecting 0.05 times of formation pore volume to 1.5 times of formation pore volumes using high-pressure pump enters
Row exploitation.
2. the cold method adopted of shallow oil reservoir reducing thick oil viscosity according to claim 1, it is characterised in that water is clear water or oil field
Sewage.
3. the cold method adopted of shallow oil reservoir reducing thick oil viscosity according to claim 1 or 2, it is characterised in that alkaline matter is alkali
Or urea.
4. the cold method adopted of shallow oil reservoir reducing thick oil viscosity according to claim 3, it is characterised in that when alkaline matter is alkali
When, alkali is one kind in sodium carbonate, sodium acid carbonate, sodium hydroxide, and its consumption accounts for the 0.1% to 3% of alkaline displacement of reservoir oil viscosity reduction agent solution.
5. the cold method adopted of shallow oil reservoir reducing thick oil viscosity according to claim 3, it is characterised in that when alkaline matter is urine
When plain, its consumption accounts for the 10% to 60% of alkaline displacement of reservoir oil viscosity reduction agent solution.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710517381.4A CN107143319A (en) | 2017-06-29 | 2017-06-29 | The cold method adopted of shallow oil reservoir reducing thick oil viscosity |
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| CN201710517381.4A CN107143319A (en) | 2017-06-29 | 2017-06-29 | The cold method adopted of shallow oil reservoir reducing thick oil viscosity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107630688A (en) * | 2017-11-09 | 2018-01-26 | 中国石油大港油田勘探开发研究院 | A kind of high pour point oil reservoir stratum, which is mixed, dilute cold adopts evaluation of new technology method |
| CN110630233A (en) * | 2019-10-31 | 2019-12-31 | 中国石油大学胜利学院 | Thickened oil cold production process suitable for shallow well layer |
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| GB2377711A (en) * | 2001-07-20 | 2003-01-22 | Ingen Process Ltd | Thinning of crude oil in a bore well |
| CN1810933A (en) * | 2006-03-13 | 2006-08-02 | 辽宁奥克化学集团有限公司 | Thick oil demulsifier and its prepn |
| CN1861979A (en) * | 2006-06-23 | 2006-11-15 | 中国石油天然气股份有限公司 | Method of heavy oil cold flow production |
| CN101328798A (en) * | 2008-07-31 | 2008-12-24 | 中国石油天然气股份有限公司 | Method for extracting thick oil |
| US20090178806A1 (en) * | 2008-01-11 | 2009-07-16 | Michael Fraim | Combined miscible drive for heavy oil production |
| CN101768462A (en) * | 2008-12-31 | 2010-07-07 | 中国石油化工股份有限公司 | Emulsifying and viscosity-decreasing method of thick oil |
| CN103923631A (en) * | 2014-04-16 | 2014-07-16 | 吴应莉 | Auxiliary for cold production of thickened oil |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2377711A (en) * | 2001-07-20 | 2003-01-22 | Ingen Process Ltd | Thinning of crude oil in a bore well |
| CN1810933A (en) * | 2006-03-13 | 2006-08-02 | 辽宁奥克化学集团有限公司 | Thick oil demulsifier and its prepn |
| CN1861979A (en) * | 2006-06-23 | 2006-11-15 | 中国石油天然气股份有限公司 | Method of heavy oil cold flow production |
| US20090178806A1 (en) * | 2008-01-11 | 2009-07-16 | Michael Fraim | Combined miscible drive for heavy oil production |
| CN101328798A (en) * | 2008-07-31 | 2008-12-24 | 中国石油天然气股份有限公司 | Method for extracting thick oil |
| CN101768462A (en) * | 2008-12-31 | 2010-07-07 | 中国石油化工股份有限公司 | Emulsifying and viscosity-decreasing method of thick oil |
| CN103923631A (en) * | 2014-04-16 | 2014-07-16 | 吴应莉 | Auxiliary for cold production of thickened oil |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107630688A (en) * | 2017-11-09 | 2018-01-26 | 中国石油大港油田勘探开发研究院 | A kind of high pour point oil reservoir stratum, which is mixed, dilute cold adopts evaluation of new technology method |
| CN107630688B (en) * | 2017-11-09 | 2020-06-02 | 中国石油大港油田勘探开发研究院 | Novel technical evaluation method for dilution-doping cold recovery of high-pour-point oil reservoir stratum |
| CN110630233A (en) * | 2019-10-31 | 2019-12-31 | 中国石油大学胜利学院 | Thickened oil cold production process suitable for shallow well layer |
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Application publication date: 20170908 |
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