CN1487170A - Water displaced steam injecting hot masout exploiting method - Google Patents
Water displaced steam injecting hot masout exploiting method Download PDFInfo
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- CN1487170A CN1487170A CNA031564763A CN03156476A CN1487170A CN 1487170 A CN1487170 A CN 1487170A CN A031564763 A CNA031564763 A CN A031564763A CN 03156476 A CN03156476 A CN 03156476A CN 1487170 A CN1487170 A CN 1487170A
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Abstract
The water displaced steam injecting hot masout exploiting method is used for further explitation of water displaced masout deposit to raise the exploiting rate. The water displaced masout deposit is converted into hot steam soak and hot steam displacement through the steps of: selecting masout deposit with oil layer depth smaller than 3000 m, residual oil saturation degree greater than 0.30, oil depth thickness greater than 5.0 m, net total thickness ratio greater than 0.3, oil layer porosity greater than 0.15 and permedbility variation coefficient smaller than 0.8; selecting reversed nine-point well network and drilling new steam injecting well apart from production well by 150-300 m for steam injecting hot exploitation; and converting into steam displacement of simultaneous steam injection and continuous production with single well steam injection speed of 1.0-3.0 cu m/d. ha m, well bottom steam quality greater than 30 % and injection-production ratio manufactured over 1.0. The present invention raises recovery ratio by over 10 %.
Description
Affiliated field
The present invention relates to oil exploitation technology, is a kind of to water drive or the later black oil reservoir continuation exploitation of water drive, black oil reservoir heat extraction by steam injection method after the water drive of raising recovery ratio.
Background technology
The mining type overwhelming majority of black oil reservoir is a water drive based on waterflooding extraction.Water drive is under certain well pattern, well spacing, by certain injection rate water filling in subsurface deposit, makes oil reservoir keep certain pressure, keep stable exploitation a period of time, the recovery percent of reserves of water drive greatly between 20-40%, after water drive, underground also leave a large amount of residue oil reservoirs can not extraction.
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.Contain the oil reservoir of solution gas condition viscosity of crude as reservoir temperature and crude oil greater than 50mPa.s.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 couple of days, again opening well and making production.Another method of steam thermal recovery is a steam flooding, promptly by preferred development system---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.For viscous crude, the heat extraction by steam injection recovery ratio can reach 15%-60%.Be lower than the bigger black oil reservoir oil field of oil reservoir, particularly reserves of 30mPa.s for the viscosity of crude under the reservoir condition, adopt above-mentioned waterflooding extraction mode usually, it is generally acknowledged that because cost of production and technology, thermal recovery can not be suitable for.
Summary of the invention
The object of the invention provides a kind of black oil reservoir continuation exploitation to being difficult to exploit after water drive or water drive, improves recovery ratio, reduces the water drive black oil reservoir heat extraction by steam injection method of cost of winning.
For realizing the present invention, adopt following technical scheme:
Just in water drive or carried out water drive method exploitation, viscosity of crude changes less than the black oil reservoir of 30mPa.s that steam for thermal recovery is handled up and the method for steam flooding under the reservoir condition;
1) selected water drive black oil reservoir 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) heat extraction by steam injection is selected anti-9 well patterns, bores new well as annotating the vapour well, annotates vapour well and producing well well spacing between 150-300m;
3) 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.
The present invention also adopts following technical scheme:
Steamed well and producing well also can carry out steam soak; Being higher than the high pressure oil reservoir of 5 MPas or the heavy well group of oil layer pollution for pressure should carry out steam soak 1-3 week after date earlier and change steam flooding again over to.
Well pattern also can be selected anti-5 well patterns or anti-7 well patterns.
The steam that injects can mix and be less than 50% non-condensation gas.
Effect of the present invention is as follows:
1) metaideophone steam exploitation after the water drive can be brought into play fully the involve characteristics of steam+hot water flooding on section of reservoir, and the macroscopic view that improves the displacement fluid involves scope;
2) high-temperature steam can make the complete water of rock surface wet, improves the water absorbing capacity of fine pore, and then improves the microcosmic spread effect of displacement fluid; The complete water of rock surface is wet also will to improve oil displacement efficiency significantly;
3) the high heat of high temperature can make the lighter hydrocarbons vaporization, improves oil displacement efficiency significantly, and the lightweight component content in the crude oil is high more, and effect is good more.
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) high temperature can reduce viscosity of crude significantly, reduces the viscosity ratio of oil and water of water drive scope, and then improves the waterflooding effect of water drive scope; The reduction significantly of viscosity of crude can also significantly improve rate of oil production.
5) significantly improving of swept volume and oil displacement efficiency will be realized increasing substantially of recovery ratio; That is: recovery ratio=sweep efficiency * oil displacement efficiency, 1. conventional water drive low viscosity recovery factor of heavy oil reservoir ≈ 0.5 * 0.55 ≈ 0.28; 2. 200 ℃ of vapour driving oil recovery yield ≈ 0.75 * 0.85 ≈ 0.64.The recovery ratio of directly changeing steam flooding after the water drive is higher by 20%～30% than conventional water drive.
The present invention is directed to the large-scale common dirty oil oil field excavation remaining oil of employing non-heavy crude reservoir reserves enormous function is arranged.Black oil reservoir Steam-injection Development after the water drive can improve recovery percent of reserves 20% even 30%.If there is 50% the suitable metaideophone steam thermal recovery of reserves in these oil fields, improve recovery percent of reserves 20%, like this, 10,000,000,000 tons of recoverable reserves can increase by 1,400,000,000 tons of recoverable reserves, are equivalent to find a large-scale oil field, have saved huge exploration expenditure and oilfield construction expense.
Inventive embodiments
The present invention is in the high moisture back of the black oil reservoir that provides Steam-injection Development.
Exploited carrying out or carried out the water drive method, change in the black oil reservoir of (be under the reservoir temperature, contain solution gas crude oil) viscosity of crude less than 30mPa.s (under the reservoir temperature condition and do not contain the viscosity of crude of solution gas) under the reservoir temperature that vapours is handled up and steam drive oil production technology over to generally near 100mPa.s, for water-drive pool, because gravity difference, the bottom of oil reservoir is strong water-flushed zone, and top is weak water-flushed zone substantially.And the present invention utilizes the steam overlap phenomenon just, increases substantially the development degree of oil reservoir on vertically, and the macroscopic view that improves the displacement fluid involves scope, thereby improves recovery ratio.
Remaining oil saturation after the water drive is the key that can decision steam injection development, remaining oil saturation greater than 0.30 situation under, can consider steam injection development.After oil reservoir stops water filling,, determine that well pattern, well spacing and the notes of steam injection development are adopted operating parameter according to geology, the exploitation situation of oil reservoir.According to the actual state of oil reservoir, to select steam soak exploitation one to three all after dates to change steam driving exploitation, or directly change steam drive development over to, the initial stage is adopted the high pressure steam injection, strengthens production-injection ratio and realizes that progressively vapour drives, to reach the purpose that improves recovery ratio.
The steam distilled mechanism of the present invention accounts for leading role, and the viscosity reduction effect of crude oil is less.As being the crude oil (i.e. distillation rate is at the crude oil more than 60.0%) of 5.0mPa.s to viscosity of crude, its steam distillation effect accounts for 37% to the contribution of oil recovery factor, and the viscosity reduction effect only accounts for about 12%.For viscous crude, as the crude oil of viscosity of crude at (i.e. distillation rate is below 10.0%) more than the 1000mPa.s, because the lighter hydrocarbons content in the viscous crude is few, its steam distillation effect can be ignored substantially to oil recovery factor, and the viscosity reduction effect accounts for more than 50% the contribution of oil recovery factor, therefore, the invention provides thermal recovery technology method targetedly.
Embodiment 1
Oil field 1 reservoir buried depth is at 300-500m, and effective pay thickiness is 21.0m, and clean gross thickness ratio is 0.46, average pore is 20%, mean permeability 200md, coefficient of permeability variation 0.7, viscosity of crude is 30cp under the reservoir condition, and original oil in place is 1.3 hundred million tons.Waterflooding extraction has been adopted in the oil field, and moisture content is higher, and the stage recovery percent of reserves only is 22.0%.
1) according to oil field geologic feature and exploitation present situation, carries out coarse screening.This oil reservoir 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) select anti-5 well patterns, stepout well is as annotating the vapour well, and producer-injector spacing can be at 150 meters.
3) oil reservoir field pressure is 3 MPas, pollutes gently, directly changes steam flooding.Annotate vapour well continuous steam injection, producing well is produced continuously, and individual well group steam injection rate is 1.2m
3/ d.ha.m, the shaft bottom steam quality is greater than 30%, and production-injection ratio remains on more than 1.0.
The steam that injects can mix and is less than 50% non-condensation gas, and like nitrogen, carbon dioxide, CO gas etc. improve the gas injection heat content.
On the basis of water drive, can improve recovery percent of reserves 30.4%, gas oil ratio can reach more than 0.20, add the recovery percent of reserves of water drive, overall recovery factor can reach 52.4%, is equivalent to and has found an elephant, and saved huge exploration investment and production capacity construction investment.
Embodiment 2
Oil field 2 reservoir buried depths are at 2000m, and effective pay thickiness is 5.5m, and clean gross thickness ratio is 0.5, and average pore is 18%, mean permeability 200md, and coefficient of permeability variation 0.6, viscosity of crude is 3-5cp under the reservoir condition, original oil in place is 2.3 hundred million tons.Waterflooding extraction has been adopted in the oil field, and moisture content is higher, and the stage recovery percent of reserves only is 20.0%.
1) according to oil field geologic feature and exploitation present situation, carries out coarse screening.This oil reservoir 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) select anti-9 well patterns, stepout well is as annotating the vapour well, and producer-injector spacing can be at 250 meters.
3) formation pressure 6 MPas, pollution is heavy, annotates vapour well and producing well and carries out 3 cycles of steam soak earlier, to reach the purpose of removing near wellbore zone pollution and reduction formation pressure, annotates vapour well continuous steam injection then, and producing well is produced continuously.Individual well group steam injection rate is 2.0m
3/ d.ha.m, the shaft bottom steam quality is greater than 30%, and production-injection ratio remains on more than 1.0.
Embodiment 3
Oil field 3 reservoir buried depths are at 1000m, and effective pay thickiness is 21.0m, and clean gross thickness ratio is 0.46, and average pore is 20%, mean permeability 200md, and coefficient of permeability variation 0.7, viscosity of crude is 20cp under the reservoir condition, original oil in place is 1.3 hundred million tons.Waterflooding extraction has been adopted in the oil field, and moisture content is higher, and the stage recovery percent of reserves only is 25.0%.
1) according to oil field geologic feature and exploitation present situation, carries out coarse screening.This oil reservoir 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) select anti-7 well patterns, stepout well is as annotating the vapour well, and producer-injector spacing can be at 180 meters.
3) oil layer pollution is heavy, annotates vapour well and producing well and can carry out earlier 2 cycles of steam soak, removes near wellbore zone pollution purpose to reach, and annotates vapour well continuous steam injection then, and producing well is produced continuously; For low pressure and pollute light oil reservoir, can directly change steam flooding.Individual well group steam injection rate is 1.0m
3/ d.ha.m, the shaft bottom steam quality is greater than 30%, and production-injection ratio remains on more than 1.0.
On the basis of present water drive, can improve recovery percent of reserves 25.4%, gas oil ratio can reach more than 0.20, adds the recovery percent of reserves of water drive, and overall recovery factor can reach 50.4%.
Claims (4)
1, a kind of water drive black oil reservoir heat extraction by steam injection method was exploited carrying out or carried out the water drive method, changed in the black oil reservoir of viscosity of crude less than 30mPa.s under the reservoir temperature that vapours is handled up and steam drive oil production technology over to, it is characterized in that:
1) selected water drive black oil reservoir 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) well pattern is selected anti-9 well patterns, bores new well as steamed well, and steamed well and producing well well spacing are between 150-300m;
3) change steam flooding over to, 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 water drive black oil reservoir heat extraction by steam injection method according to claim 1 is characterized in that steamed well and producing well also can carry out steam soak; Being higher than the high pressure oil reservoir of 5 MPas or the heavy well group of oil layer pollution for pressure should carry out steam soak 1-3 week after date earlier and change steam flooding again over to.
3, a kind of water drive black oil reservoir 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 water drive black oil reservoir heat extraction by steam injection method according to claim 1 is characterized in that the steam that injects can mix and is less than 50% non-condensation gas.
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| CN 03156476 CN1271314C (en) | 2003-08-29 | 2003-08-29 | Water displaced steam injecting hot masout exploiting method |
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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 transferring steam driven at thickened oil steam taking-in and sending-out later period post |
| CN101592028B (en) * | 2008-05-28 | 2012-01-11 | 中国石油天然气股份有限公司 | Gas-assisted SAGD method for exploiting super heavy oil |
| CN101555787B (en) * | 2009-05-15 | 2013-03-27 | 中国石油天然气股份有限公司 | Improved steam drive oil production method |
| CN110905470A (en) * | 2019-12-17 | 2020-03-24 | 于文英 | Method for exploiting oil and gas by utilizing bottom water resources of oil and gas reservoir |
| WO2023078433A1 (en) * | 2021-11-05 | 2023-05-11 | 北京红蓝黑能源科技有限公司 | Oil and gas exploitation method by injecting water into oil and gas reservoir water layer |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106294282B (en) * | 2016-08-01 | 2019-04-12 | 中国石油天然气股份有限公司 | Black oil reservoir simulation method and device |
-
2003
- 2003-08-29 CN CN 03156476 patent/CN1271314C/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 transferring steam driven at thickened oil steam taking-in and sending-out later period post |
| CN101592028B (en) * | 2008-05-28 | 2012-01-11 | 中国石油天然气股份有限公司 | Gas-assisted SAGD method for exploiting super heavy oil |
| CN101555787B (en) * | 2009-05-15 | 2013-03-27 | 中国石油天然气股份有限公司 | Improved steam drive oil production method |
| CN110905470A (en) * | 2019-12-17 | 2020-03-24 | 于文英 | Method for exploiting oil and gas by utilizing bottom water resources of oil and gas reservoir |
| WO2023078433A1 (en) * | 2021-11-05 | 2023-05-11 | 北京红蓝黑能源科技有限公司 | Oil and gas exploitation method by injecting water into oil and gas reservoir water layer |
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