CN100999992B - Method for transferring steam driven at thickened oil steam taking-in and sending-out later period post - Google Patents
Method for transferring steam driven at thickened oil steam taking-in and sending-out later period post Download PDFInfo
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- CN100999992B CN100999992B CN200610000622XA CN200610000622A CN100999992B CN 100999992 B CN100999992 B CN 100999992B CN 200610000622X A CN200610000622X A CN 200610000622XA CN 200610000622 A CN200610000622 A CN 200610000622A CN 100999992 B CN100999992 B CN 100999992B
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Abstract
The present invention relates to thick oil recovery ratio raising technology, and is especially pseudo horizontal well steam flooding method of converting to steam flooding in the late stage of thick oil steam soak. In steam soak production wells, the natural blow-by channel formed in the steam soak course is determined based on the dynamic production record, the well in the natural blow-by channel is used as the steam injecting well while the surrounding wells as the production well, and steam is injected continuously, so that steam diffuses in the natural blow-by channel and the production wells may produce continuously. The pseudo horizontal well steam flooding method can raise thick oil recovery ratio and raise oil and gas output.
Description
Technical field
The invention belongs to the oil-gas field development field, relate in the heavy crude reservoir exploitation and improve the oil recovery factor technology, is a kind of method for transferring steam driven at thickened oil steam taking-in and sending-out later period post of pseudo level well steam flooding.
Background technology
Steam soak is the main mining type of heavy crude reservoir, and heavy crude reservoir is after the long-term exploitation of experience, and most heavy oil blocks enters high round and handles up the stage, and the cycle oil production reduces, gas oil ratio reduces, the economic benefit variation.For example, certain oil-field thick-oil production area output can account for 61.3% of total field putput, and through long-term exploitation back effect worse and worse, average steam oil ratio (SOR) drops to 0.395, near economic limit 0.3.After output reduces gradually, be to keep stable yields, well pattern is also encrypted 70m～100m gradually by original 200 meters, adds high-quality reserved resources deficiency, and heavy oil development can face serious situation.How adopting cost-effective cyclic steam stimulation substituted technique, is the major issue that faces.
Oil well enters the high round back exploitation effect variation of handling up, wherein main cause is owing to some heavy crude reservoir majorities are to form in the nonmarine environment deposit, the oil reservoir non-homogeneity is serious, forms vapour along high permeability zone easily in the steam injection process and scurries, for example, after certain oil field exploitation oil reservoir was handled up 3 years, disturb aggravation between well, interfering well quantity increases, when handling up to the period 6, each well is all scurried mutually in the well group, has a strong impact on steam soak effect and oil field development overall efficiency.In addition, because formation pressure has been reduced to 20～30% of original formation pressure, the natural energy wretched insufficiency adds that oil reservoir water amount is big, and it is very big further to improve the oil recovery factor difficulty.The mode one that can take at present is to improve the cyclic steam stimulation effect, changes mining type besides, to the stratum makeup energy.For first kind of mode, no matter take which kind of measure, as the whole steam soak of many wells, interpolation CO2 etc., only can play the effect of limited prolongation throughput time, tackle the problem at its root, must the conversion mining type.But if change steam driving exploitation over to according to regular well pattern, owing to reasons such as vapour is scurried, hole condition differences, the vapour that causes producing oil is lower, deficiency in economic performance.
Summary of the invention
The object of the invention provides a kind ofly to be utilized vapour to scurry local the commentaries on classics to drive and then realize pseudo level well steam flooding, improves oil recovery factor and produces the method for transferring steam driven at thickened oil steam taking-in and sending-out later period post of gas oil ratio.
The invention provides following technical scheme.
A kind of method for transferring steam driven at thickened oil steam taking-in and sending-out later period post, in more than one steam soak is produced well group, carry out the numerical simulation history matching according to the method for producing dynamically recording, monitoring materials employing routine, determine that described steam soak produces the natural vapour that well group forms and scurry passage in the steam soak process, to be in well that nature vapour scurries passage as annotate the vapour well, well is as producing well on every side, to annotating vapour well continuous steam injection, make steam in vapour is scurried passage to around expansion, producing well is produced continuously.
The present invention also provides following technical scheme.
Numerical reservoir simulation method is adopted in described numerical simulation history matching, and in conjunction with tracer method, four-dimensional seismic monitoring method.
Being positioned at height oozes the well that vapour scurries on the passage and annotates vapour simultaneously.
Described notes vapour well injection-production technology parameter is: steam injection rate: 1～2 meter
3/ day well group area core intersection; Annotate the vapour mass dryness fraction: the well head mass dryness fraction is greater than 60%, and the shaft bottom mass dryness fraction is greater than 40%; The lines of producing wells liquid measure: scurry well group for vapour, the design of producing well total displacement is to annotate more than 1～1.2 times of vapour well steam injection rate.
The present invention utilizes the on-the-spot actual geologic data in oil field, make the best use of the situation, become unfavorable factor into favourable, make full use of vapour and scurry passage, earlier local commentaries on classics of well group that vapour is scurried drives, and then oozes the well that vapour scurries on the passage and annotate vapour simultaneously, the notion of the well pattern that breaks traditions being positioned at height, form " pseudo level well steam flooding ", improve thick oil filling steam oil recovery factor effectively.The present invention compares with conventional steam flooding, can improve oil recovery factor significantly, drives than conventional vapour and improves 14%, and the cumulative production gas oil ratio also improves 0.064.
Description of drawings
Fig. 1 is the present reservoir temperature distribution (commentaries on classics is driven preceding) of the embodiment of the invention;
Fig. 2 is the different mining type oil production of an embodiment of the invention correlation curve;
Steam zone distribution map in oil reservoir when Fig. 3 is the end of embodiment of the invention difference mining types;
Reservoir temperature distributed when Fig. 4 was the end of embodiment of the invention difference mining types.
The specific embodiment
Pseudo level well steam flooding of the present invention refers in one or several well group, utilizes high permeability zone vapour to scurry passage, annotates vapour by the well that mutual generation vapour is scurried, and other well recovers the oil, and steam to expansion all around, forms local vapour and drives in vapour is scurried passage.Vapour is scurried passage and is equivalent to horizontal wellbore, and steam is the side direction expansion in passage.Rely on the effect of mass transmitting and the heat exchange action of steam, improve strata pressure on the one hand, increase the driving energy; On the other hand the heat content that steam is carried with the heating crude oil around the steam zone, reduce viscosity of crude, and and then flow to producing well, improve thick oil filling steam oil recovery factor.
To the oil reservoir structural configuration is the monoclinal structure of an inclination, 7 °-14 ° of stratigraphic dips.Main oil-bearing series is husky four sections and goes up the tame table oil layer of Du that reservoir buried depth is 852-1334m, based on the thin interbed shape, the oil field that the oil reservoir thickness in monolayer is thin, the number of plies is many, oil reservoir belongs to high hole, the saturating oil reservoir of middle and high infiltration, and reservoir heterogeneity is serious, average pore 28.1%, mean permeability 918.3 * 10
-3μ m
2
According to produce dynamically, analysis of monitoring data and numerical simulation history matching, adopt tracer method or four-dimensional seismic monitoring method or numerical reservoir simulation method, judge that the vapour that forms in the steam soak process scurries passage (as Fig. 1).
To above oil reservoir, adoptable technical scheme has following several:
1) steam soak on earth
On the basis of present steam soak, proceed cyclic steam stimulation, up to the gas oil ratio that reaches capacity.For this mode, because at present strata pressure is lower, adds Shanghai Automobile Factory and reason such as scurry, if continue to handle up down, recovery percent of reserves improves 3% at most.
2) the conventional steam flooding that changes
Because the exploitation effect that continues to handle up is limited, therefore, must be to the stratum makeup energy, the most frequently used mining type is taked inverted nine-spot pattern exactly at present, and middle a bite well is annotated vapour, and producing well recovers the oil on every side.
For this mode, oil recovery factor is improved, but because the vapour problem of scurrying of puzzlement field produces still exists, therefore, recovery percent of reserves improves limited, and gas oil ratio is low, deficiency in economic performance.
3) pseudo level well steam flooding of the present invention
Be in well that vapour scurries passage as annotate the vapour well, other well is as producing well on every side.Notes vapour well continuous steam injection, producing well are produced continuously.Design injection-production technology parameter is;
1) steam injection rate: 1.6～1.8m3/ (dham) (i.e. 3/ day well group area core intersection of rice)
2) annotate the vapour mass dryness fraction: the well head mass dryness fraction is greater than 60%, and the shaft bottom mass dryness fraction is greater than 40%;
3) lines of producing wells liquid measure: scurry well group for vapour, the design of producing well total displacement is to annotate more than 1.2 times of vapour well steam injection rate (equivalent cold water equivalent).
The result shows that this mode can improve oil recovery factor significantly, drives than conventional vapour and improves 14%, and the accumulation gas oil ratio also improves 0.064 (table 1).
Fig. 3 and Fig. 4 be respectively different mining types when finishing the oil reservoir steam zone distribute and Temperature Distribution.As can be seen, drive by adopting pseudo level well vapour, the displacement scope obviously increases, and exploitation effect improves.
The different mining type development index contrasts of table 1
| Vapour drives mode | Prolong the production time (d) | Annotate vapour amount (t) | Oil production (t) | Gas oil ratio | Improve recovery percent of reserves (%) |
| Continue steam soak | 437 | 18000 | 4557 | 0.253 | 2.93 |
| Conventional vapour drives | 2109 | 210900 | 33788 | 0.160 | 21.7 |
| Pseudo level well vapour drives | 2550 | 255000 | 57042 | 0.224 | 36.7 |
Claims (3)
1. method for transferring steam driven at thickened oil steam taking-in and sending-out later period post, it is characterized in that: in more than one steam soak is produced well group, carry out the numerical simulation history matching according to the method for producing dynamically recording, monitoring materials employing routine, determine that described steam soak produces the natural vapour that well group forms and scurry passage in the steam soak process, to be in well that nature vapour scurries passage as annotate the vapour well, well is as producing well on every side, to annotating vapour well continuous steam injection, make steam in vapour is scurried passage to around the expansion, producing well is produced continuously; Described notes vapour well injection-production technology parameter is: steam injection rate: 1.6～1.8 meters
3/ day well group area core intersection; Annotate the vapour mass dryness fraction: the well head mass dryness fraction is greater than 60%, and the shaft bottom mass dryness fraction is greater than 40%; The lines of producing wells liquid measure: scurry well group for vapour, the design of producing well total displacement is to annotate more than 1～1.2 times of vapour well steam injection rate.
2. method for transferring steam driven at thickened oil steam taking-in and sending-out later period post according to claim 1 is characterized in that: described numerical simulation history matching, adopt numerical reservoir simulation method, and in conjunction with tracer method, four-dimensional seismic monitoring method.
3. method for transferring steam driven at thickened oil steam taking-in and sending-out later period post according to claim 1 is characterized in that: be positioned at height and ooze the well that vapour scurries on the passage and annotate vapour simultaneously.
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| CN101661514B (en) * | 2008-05-21 | 2014-04-16 | 中国石化股份胜利油田分公司地质科学研究院 | Oil deposit black oil model numerical simulation system |
| CN101852074B (en) * | 2010-05-27 | 2013-02-13 | 中国石油天然气股份有限公司 | Method and system for exploiting lamellar super-heavy oil deposit |
| CN101871341B (en) * | 2010-06-13 | 2013-03-06 | 西安石油大学 | Method for improving thick oil recovery ratio |
| CN103510931A (en) * | 2012-06-19 | 2014-01-15 | 中国石油化工股份有限公司 | Method for simulating vertical well steam driving |
| CN103498651B (en) * | 2013-09-10 | 2015-12-02 | 中国石油天然气股份有限公司 | Thickened oil steam-stimulated well pressure curve gathers and application process |
| CN106368661A (en) * | 2015-07-20 | 2017-02-01 | 中国石油天然气股份有限公司 | Method for determining time point for shifting from steam huff and puff to steam drive |
| CN107664030A (en) * | 2016-07-29 | 2018-02-06 | 中国石油化工股份有限公司 | Super-heavy oil deposit horizontal well steam drives the method for improving recovery ratio |
| CN107664031B (en) * | 2016-07-29 | 2020-03-24 | 中国石油化工股份有限公司 | Method for improving recovery efficiency by determining steam flooding well pattern form of horizontal well |
| CN106593377A (en) * | 2016-12-19 | 2017-04-26 | 中国石油天然气股份有限公司 | Steam flooding starting method for super-heavy oil horizontal wells |
| CN107201891A (en) * | 2017-07-27 | 2017-09-26 | 中国海洋石油总公司 | A kind of handled up follow-up turn suitable for offshore viscous oil field drives the method developed |
| WO2020194031A1 (en) * | 2019-03-26 | 2020-10-01 | Abu Dhabi National Oil Company | Use of chemical in-flow tracers for early water breakthrough detection |
| CN112081568B (en) * | 2019-06-12 | 2022-12-02 | 中国石油化工股份有限公司 | Thermal recovery heavy oil combined huff-puff well selection decision method |
| CN114198073A (en) * | 2020-08-31 | 2022-03-18 | 中国石油化工股份有限公司 | Method for improving recovery efficiency of steam huff and puff steam channeling horizontal well |
| CN112796745B (en) * | 2021-02-18 | 2022-10-11 | 中海油田服务股份有限公司 | Method and device for determining production dynamic data of steam flooding oil reservoir |
| CN112523731B (en) * | 2021-02-18 | 2021-05-25 | 中国石油大学(华东) | Method for exploiting common thick oil by utilizing high permeability zone |
| CN115370334A (en) * | 2021-05-20 | 2022-11-22 | 中国石油天然气股份有限公司 | Steam injection adjusting method for reducing oil reservoir steam channeling |
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