CN1488837A - Wax-containing low-permeability oil reservoir steam injection thermal recovery method - Google Patents
Wax-containing low-permeability oil reservoir steam injection thermal recovery method Download PDFInfo
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- CN1488837A CN1488837A CNA03156478XA CN03156478A CN1488837A CN 1488837 A CN1488837 A CN 1488837A CN A03156478X A CNA03156478X A CN A03156478XA CN 03156478 A CN03156478 A CN 03156478A CN 1488837 A CN1488837 A CN 1488837A
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- 238000010793 Steam injection (oil industry) Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000011084 recovery Methods 0.000 title abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000002347 injection Methods 0.000 claims abstract description 21
- 239000007924 injection Substances 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- 238000010795 Steam Flooding Methods 0.000 claims abstract description 13
- 238000000605 extraction Methods 0.000 claims description 16
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 238000010794 Cyclic Steam Stimulation Methods 0.000 claims description 5
- 238000009825 accumulation Methods 0.000 claims description 5
- 125000004122 cyclic group Chemical group 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 2
- 230000005494 condensation Effects 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 95
- 239000010779 crude oil Substances 0.000 abstract description 11
- 230000035699 permeability Effects 0.000 abstract description 8
- 239000011148 porous material Substances 0.000 abstract description 4
- 230000009747 swallowing Effects 0.000 abstract 1
- 239000001993 wax Substances 0.000 description 26
- 239000007789 gas Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 239000012188 paraffin wax Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000002595 cold damage Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
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- Edible Oils And Fats (AREA)
Abstract
The invention relates to a steam injection thermal recovery method for a wax-containing low-permeability oil reservoir, which is suitable for the oil reservoir with the wax content of more than 10% and the crude oil viscosity of less than 100mPa.s, and meets the following conditions: the depth of an oil layer is less than 3000m, the saturation of the residual oil is more than 0.30, the total thickness of the oil layer is more than 5.0m, the net total thickness ratio is more than 0.3, the porosity of the oil layer is more than 0.15, and the coefficient of variation of permeability is less than 0.8; firstly, steam swallowing is carried out, and the steam injection amount of a single well is 50-250 m3Stopping the well for 3-15 days, opening the well again, and circulating the steps; when the pressure of an oil layer is reduced to be below 5.0MPa, large-section steam drive and water drive are adopted for exploitation, a reverse 9-point well pattern is selected, steam is injected into a new well, and the well distance between an injection well and an exploitation well is 100-250 m; the steam injection well injects steam continuously, the production well produces steam continuously, and the steam injection speed of a single well group is 1.0-3.0 m3Ha.m, the dryness of steam at the bottom of the well is more than 30 percent, and the extraction-injection ratio is kept above 1.0. 5) When the accumulated injected steam reaches 0.3-1.0 times of pore volume, water injection development can be carried out. The present invention can obviously raise oil-producing speed and oil-recovering rate.
Description
Affiliated field
The present invention relates to oil exploitation technology, is a kind of content of wax low-permeability oil deposit that is applicable to, improves the content of wax low-permeability oil deposit heat extraction by steam injection method of rate of oil production and recovery ratio.
Background technology
Content of wax low-permeability oil deposit, promptly the oil reservoir wax content in crude oil is more than 20%, and the wax precipitation point of crude oil is higher, and a little less than reservoir temperature, as long as the stratum degassing, that viscosity of crude rises is fast, easily analyse wax in the oil reservoir.And the degree of porosity of oil reservoir is lower than 17%, and permeability also is lower than 10md.At present, this class oil reservoir generally adopts waterflooding extraction, easily causes cold damage to oil reservoir but inject water, after the oil reservoir wax deposition, makes the development effectiveness variation of water filling, particularly development effectiveness extreme difference when K/ μ＜0.5md/cp (K permeability/μ stratum viscosity).So the rate of oil production of content of wax low-permeability oil deposit generally all is lower than 1.0% at present, recovery ratio is not high yet.A kind of method commonly used in the oil exploitation is a heat extraction by steam injection, only is used for the heavy crude reservoir of its viscosity height, mobile difference.The steam soak thermal recovery is the steam that injects some to a bite producing well in a short time continuously, and closing well is after a period of time, again opening well and making production.Another method of steam thermal recovery is a steam flooding, promptly by preferred straticulate exploration, well pattern (well spacing), perforated zone etc., injects high-temperature wet steam vapour to oil reservoir continuously by injecting well, and heating and displacement crude oil are by the mining type of producing well extraction.This method is at viscous crude and special viscous crude oil reservoir, is not used in the exploitation of content of wax low-permeability oil deposit.
Summary of the invention
The object of the invention provides a kind of being applicable in the content of wax low-permeability oil deposit, improves development effectiveness, improves the content of wax low-permeability oil deposit heat extraction by steam injection method of rate of oil production and recovery ratio.
For realizing the present invention, adopt following technical scheme:
Viscosity of crude changes less than the low-permeability oil deposit of 100mPa.s that steam for thermal recovery is handled up and the method for steam flooding under the paraffin content of exploiting higher (greater than 10%), the reservoir temperature;
1) selected content of wax low-permeability oil deposit meets the following conditions: reservoir depth＜3000m, remaining oil saturation＞0.30, oil reservoir gross thickness＞5.0m, clean gross thickness ratio＞0.3, oil reservoir degree of porosity＞0.15, coefficient of permeability variation＜0.8;
2) at first carry out cyclic steam stimulation.The cyclic steam injection volume of individual well is 50-250m
3/ m oil reservoir is annotated vapour and was finished the back stewing well 3-15 days, and opening well and making production treats to begin when produce oil dropped to economic boundaries in instantaneous day next alternate water injection vapour, so circulation again.
3) drop to 5.0MPa when following when formation pressure, adopt big slug steam flooding to add the mining type of water drive, select anti-9 well patterns, bore new well, annotate vapour well and producing well well spacing between 100-250m as annotating the vapour well.
4) change steam flooding over to, annotate vapour well continuous steam injection, producing well is produced continuously, and individual well group steam injection rate is 1.0～3.0m
3/ d.ha.m, the shaft bottom steam quality is greater than 30%, and production-injection ratio remains on more than 1.0.
5) when the accumulation steam in jection reaches 0.3-1.0 times of voids volume, the exploitation of metaideophone water.
The present invention also adopts following technical scheme:
Also can select anti-5 well patterns or anti-7 well patterns to well pattern.
The steam that injects can mix and is less than 50% non-condensation gas.
Effect of the present invention is as follows:
1) steam soak can be removed the wax that oil reservoir is separated out, and improves the unimpeded ability of oil reservoir hole;
2) high-temperature steam of Zhu Ruing can significantly reduce viscosity of crude, thereby improves rate of oil production;
3) high-temperature steam can greatly reduce interfacial tension, makes the complete water of rock surface wet, and the complete water of rock surface is wet will to improve oil displacement efficiency significantly, thereby improve recovery ratio;
It below is the thing mould experiment contrast table that reservoir water flooding and vapour drive
| Project | 55 ℃ of water drives | 120 ℃ of water drives | 200 ℃ of water drives | 200 ℃ of steam floodings |
| Residual oil saturation, % | ??27.8 | ??22.7 | ??19.2 | ????6.0 |
| Oil displacement efficiency, % | ??56.0 | ??61.2 | ??65.8 | ????87.2 |
4) through behind the steam soak in several cycles, adopt big slug steam flooding to add the mining type of water drive, can make recovery ratio and rate of oil production reach higher level.
Inventive embodiments
The present invention is the content of wax low-permeability oil deposit Steam-injection Development that is providing.This class oil reservoir is adopted the present invention, and the high-temperature steam of injection can be removed the wax that oil reservoir is separated out, and removes the obstruction of perforation borehole, the pollution of near wellbore zone, improves the unimpeded ability of oil reservoir hole, improves the pressure drop situation in shaft bottom, improves oil well output.High-temperature steam can significantly reduce viscosity of crude in addition, thereby improves rate of oil production; The raising of the unimpeded ability of oil reservoir hole and the obvious decline of viscosity of crude can effectively reduce the seepage flow on-way resistance, improve the production capacity of content of wax Middle-Low Permeability Reservoirs.Thereby improve rate of oil production and recovery ratio.
The production of handling up through several cycles, when formation pressure drops to 5.0MPa, geology, exploitation situation according to oil reservoir, select rational well pattern, well spacing and notes to adopt operating parameter, the mining type of taking big slug steam flooding to add water drive further improves the development effectiveness of thermal recovery, makes the recovery ratio of this thermal recovery and rate of oil production reach higher level.
Embodiment 1
Oil field 1 belongs to content of wax low-permeability oil deposit.This oil field reservoir buried depth is at 900-1200m, and effective pay thickiness is about 15.0m, and grow in reservoir regional area crack, and the average pore of reservoir is 16%, mean permeability 5md.Viscosity of crude is 10-50mPa.s under the reservoir condition, and the paraffin content of crude oil is higher, reaches about 20%, and the wax precipitation temperature of crude oil is 52.2 ℃, near 55 ℃ of reservoir temperatures.All wells are all gone into operation through pressure break, at present, this Oilfield using 300m well spacing waterflooding extraction, water injection pressure is higher, and development effectiveness is relatively poor, and rate of oil production only is 0.76%, stage recovery percent of reserves 8.78%.
1) this oil reservoir belongs to content of wax low-permeability oil deposit.According to geologic feature, oil property and the exploitation present situation of this oil reservoir, carry out coarse screening.This oil reservoir meets the following conditions: reservoir depth＜3000m, remaining oil saturation＞0.30, oil reservoir gross thickness＞5.0m, oil reservoir degree of porosity＞0.15.
2) at first carry out cyclic steam stimulation.The cyclic steam injection volume of individual well is 100-250m
3/ m oil reservoir is annotated vapour and is finished the stewing well in back 15 days, and opening well and making production treats to begin when produce oil dropped to economic boundaries in instantaneous day next alternate water injection vapour, so circulation again.
3) when formation pressure drops to the 5.0MPa left and right sides, select anti-7 well patterns, stepout well is as annotating the vapour well, and producer-injector spacing can be at 150m;
4) change steam flooding over to, annotate vapour well continuous steam injection, producing well is produced continuously, and individual well group steam injection rate is 1.0～3.0m
3/ d.ha.m, the shaft bottom steam quality is greater than 30%, and production-injection ratio remains on more than 1.0.
5) when the accumulation steam in jection reaches 0.3-0.8 times of voids volume, the exploitation of metaideophone water.
Steam injecting can mix 50% CO gas, makes the heat content of the heat content of steam in jection considerably beyond other gas, can strengthen the gas injection effect.
On the basis of exploitation at present, heat extraction by steam injection improves recovery percent of reserves 20.0%, and gas oil ratio reaches more than 0.15, changes water drive after vapour drives again and improves recovery percent of reserves 6.0%, and overall recovery factor can reach 34.8%.
Embodiment 2
Oil field 2 belongs to content of wax low-permeability oil deposit.This oil field reservoir buried depth is at 1800m, and effective pay thickiness is about 18.0m, and grow in reservoir regional area crack, and the average pore of reservoir is 17%, mean permeability 5md.Viscosity of crude is 5-40mPa.s under the reservoir condition, and the paraffin content of crude oil is higher, reaches about 20%, and the wax precipitation temperature of crude oil is 58.0 ℃, near 60 ℃ of reservoir temperatures.All wells are all gone into operation through pressure break, at present, this Oilfield using 300m well spacing waterflooding extraction, water injection pressure is higher, and development effectiveness is relatively poor, and rate of oil production only is 0.66%, stage recovery percent of reserves 8.5%.
1) this oil reservoir belongs to content of wax low-permeability oil deposit.According to geologic feature, oil property and the exploitation present situation of this oil reservoir, carry out coarse screening.This oil reservoir meets the following conditions: reservoir depth＜3000m, remaining oil saturation＞0.30, oil reservoir gross thickness＞5.0m, oil reservoir degree of porosity＞0.15.
2) at first carry out cyclic steam stimulation.The cyclic steam injection volume of individual well is 50-250m
3/ m oil reservoir is annotated vapour and is finished the stewing well in back 10 days, and opening well and making production treats to begin when produce oil dropped to economic boundaries in instantaneous day next alternate water injection vapour, so circulation again.
3) when formation pressure drops to the 5.0MPa left and right sides, select anti-9 well patterns, stepout well is as annotating the vapour well, and producer-injector spacing can be at 180m;
4) change steam flooding over to, annotate vapour well continuous steam injection, producing well is produced continuously, and individual well group steam injection rate is 1.0～3.0m
3/ d.ha.m, the shaft bottom steam quality is greater than 30%, and production-injection ratio remains on more than 1.0.
5) when the accumulation steam in jection reaches 0.5-1.0 times of voids volume, the exploitation of metaideophone water.
At the steam that injects, mix and be less than 25% carbon dioxide, make the heat content of the heat content of steam in jection considerably beyond other gas, strengthen the gas injection effect.
On the basis of exploitation at present, heat extraction by steam injection improves recovery percent of reserves 18.0%, and gas oil ratio reaches more than 0.15, changes water drive after vapour drives again and improves recovery percent of reserves 6.0%, and overall recovery factor can reach 32.5%.
Embodiment 3
Oil field 3 belongs to content of wax low-permeability oil deposit.Reservoir buried depth 2800m, effective pay thickiness is about 10.0m, and grow in reservoir regional area crack, and the average pore of reservoir is 17%, mean permeability 5md.Viscosity of crude is 5-40mPa.s under the reservoir condition, and the paraffin content of crude oil is higher, reaches about 20%, and the wax precipitation temperature of crude oil is 58.0 ℃, near 50 ℃ of reservoir temperatures.All wells are all gone into operation through pressure break, at present, this Oilfield using 300m well spacing waterflooding extraction, water injection pressure is higher, and development effectiveness is relatively poor, and rate of oil production only is 0.66%, stage recovery percent of reserves 8.5%.
1) this oil reservoir belongs to content of wax low-permeability oil deposit.According to geologic feature, oil property and the exploitation present situation of this oil reservoir, carry out coarse screening.This oil reservoir meets the following conditions: reservoir depth＜3000m, remaining oil saturation＞0.30, oil reservoir gross thickness＞5.0m, oil reservoir degree of porosity＞0.15.
2) at first carry out cyclic steam stimulation.The cyclic steam injection volume of individual well is 50-250m
3/ m oil reservoir is annotated vapour and is finished the stewing well in back 3 days, and opening well and making production treats to begin when produce oil dropped to economic boundaries in instantaneous day next alternate water injection vapour, so circulation again.
3) when formation pressure drops to the 5.0MPa left and right sides, select anti-5 well patterns, stepout well is as annotating the vapour well, and producer-injector spacing can be at 150m;
4) change steam flooding over to, annotate vapour well continuous steam injection, producing well is produced continuously, and individual well group steam injection rate is 1.0～3.0m
3/ d.ha.m, shaft bottom steam quality 50%, production-injection ratio remains on more than 1.0.
5) when the accumulation steam in jection reaches 0.5-1.0 times of voids volume, the exploitation of metaideophone water.
Steam injecting mixes 40% nitrogen, makes the heat content of the heat content of steam in jection considerably beyond other gas, strengthens the gas injection effect.
On the basis of exploitation at present, heat extraction by steam injection improves recovery percent of reserves 19.0%, and gas oil ratio reaches more than 0.20, changes water drive after vapour drives again and improves recovery percent of reserves 7.0%, and overall recovery factor can reach 35.0%.
Claims (4)
1, a kind of content of wax low-permeability oil deposit heat extraction by steam injection method, developing, change heat injection steam soak and steam drive oil production technology in the low-permeability oil deposit of viscosity of crude less than 100mPa.s under the reservoir temperature, it is characterized in that:
1) selected low-permeability oil deposit meets the following conditions: reservoir depth＜3000m, remaining oil saturation＞0.30, oil reservoir gross thickness＞5.0m, clean gross thickness ratio＞0.3, oil reservoir degree of porosity＞0.15;
2) at first carry out cyclic steam stimulation.The cyclic steam injection volume of individual well is 50-250m
3/ m oil reservoir is annotated vapour and was finished the back stewing well 3-15 days, and opening well and making production treats to begin when produce oil dropped to economic boundaries in instantaneous day next alternate water injection vapour, so circulation again;
3) when formation pressure drops to the 5.0MPa left and right sides, select anti-9 well patterns, stepout well is as annotating the vapour well, and producer-injector spacing is 100～250m;
4) change steam flooding over to, annotate vapour well continuous steam injection, producing well is produced continuously, and individual well group steam injection rate is 1.0～3.0m
3/ d.ha.m, the shaft bottom steam quality is greater than 30%, and production-injection ratio remains on more than 1.0.
2, a kind of content of wax low-permeability oil deposit heat extraction by steam injection method according to claim 1 is characterized in that when accumulation steam in jection amount reaches 0.3-1.0 times of voids volume the exploitation of metaideophone water.
3, a kind of content of wax low-permeability oil deposit heat extraction by steam injection method according to claim 1 is characterized in that well pattern also can select anti-5 well patterns or anti-7 well patterns.
4, a kind of content of wax low-permeability oil deposit heat extraction by steam injection method according to claim 1 is characterized in that the steam that injects, can mix to be less than 50% non-condensation gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03156478 CN1271316C (en) | 2003-08-29 | 2003-08-29 | Wax-containing low-permeability oil reservoir steam injection thermal recovery method |
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| CN 03156478 CN1271316C (en) | 2003-08-29 | 2003-08-29 | Wax-containing low-permeability oil reservoir steam injection thermal recovery method |
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| Publication Number | Publication Date |
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| CN1488837A true CN1488837A (en) | 2004-04-14 |
| CN1271316C CN1271316C (en) | 2006-08-23 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100999992B (en) * | 2006-01-10 | 2010-09-08 | 中国石油天然气股份有限公司 | Method for converting thickened oil steam into steam flooding in later period of steam huff and puff |
| CN101555787B (en) * | 2009-05-15 | 2013-03-27 | 中国石油天然气股份有限公司 | Steam flooding method |
| CN104948157A (en) * | 2014-03-27 | 2015-09-30 | 中国石油化工股份有限公司 | Method for steam huff and puff heavy oil reservoir development shifted after fracturing sand control |
| CN106468161A (en) * | 2015-08-14 | 2017-03-01 | 中国石油化工股份有限公司 | A kind of oil production method for fractured carbonate rock water logging heavy crude reservoir |
| CN114622876A (en) * | 2020-12-11 | 2022-06-14 | 中国石油天然气股份有限公司 | Method for exploiting thickened oil by using electric heating to assist throughput of horizontal well |
-
2003
- 2003-08-29 CN CN 03156478 patent/CN1271316C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100999992B (en) * | 2006-01-10 | 2010-09-08 | 中国石油天然气股份有限公司 | Method for converting thickened oil steam into steam flooding in later period of steam huff and puff |
| CN101555787B (en) * | 2009-05-15 | 2013-03-27 | 中国石油天然气股份有限公司 | Steam flooding method |
| CN104948157A (en) * | 2014-03-27 | 2015-09-30 | 中国石油化工股份有限公司 | Method for steam huff and puff heavy oil reservoir development shifted after fracturing sand control |
| CN106468161A (en) * | 2015-08-14 | 2017-03-01 | 中国石油化工股份有限公司 | A kind of oil production method for fractured carbonate rock water logging heavy crude reservoir |
| CN114622876A (en) * | 2020-12-11 | 2022-06-14 | 中国石油天然气股份有限公司 | Method for exploiting thickened oil by using electric heating to assist throughput of horizontal well |
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| Publication number | Publication date |
|---|---|
| CN1271316C (en) | 2006-08-23 |
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