CN104033137A - Method for improving fault block oil reservoir recovery efficiency by utilizing oilfield wastewater - Google Patents
Method for improving fault block oil reservoir recovery efficiency by utilizing oilfield wastewater Download PDFInfo
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- CN104033137A CN104033137A CN201310070932.9A CN201310070932A CN104033137A CN 104033137 A CN104033137 A CN 104033137A CN 201310070932 A CN201310070932 A CN 201310070932A CN 104033137 A CN104033137 A CN 104033137A
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Abstract
The invention discloses a method for improving the fault block oil reservoir recovery efficiency by utilizing oilfield wastewater. The method comprises the steps of selecting a fault block oil reservoir region; developing a well network adopting a mode that water injection wells and oil production wells are combined, wherein the water injection wells and the oil production wells are large in well distance and staggered bidirectionally; selecting water well stable water injection oil wells or water well cyclic water injection oil wells to periodically perform oil recovery, wherein the injection-production ratio is kept higher than 1.0, and finally the oilfield wastewater are utilized to form artificial side water flooding for improving the fault block oil reservoir recovery efficiency in the fault block oil reservoir region. The method for improving the fault block oil reservoir recovery efficiency by utilizing the oilfield wastewater re-injects the oilfield wastewater to form the artificial side water flooding in an optimizing energy supplement mode, and five purposes of increasing the oil reservoir water flooding controlled reserves, effectively supplementing energy, widening a water flooding affection region, retarding edge water tongued advance and bottom water coning, effectively relieving wastewater discharge and the like can be achieved.
Description
Technical field
The present invention relates to oilfield sewage zero-emission and Complex Fault Block Oil Reservoir ultra-high water cut stage increases substantially waterflood recovery efficiency factor method, specifically a kind of oilfield sewage that utilizes improves fault block oil reservoir oil recovery factor method.
Background technology
The oil in place that fault block oil reservoir is employed is large, in integral body, enters super-high water-cut stage, and remaining oil distribution presents the feature of " generally distribution, Local enrichment ".In addition, along with the continuous rising of oil reservoir moisture percentage, oil well produced liquid constantly increases, and causes oilfield sewage more and more, brings very large difficulty to discharge and the processing of oilfield sewage.And the outer Tapping Residual Oil for ultra-high water cut stage fault block oil reservoir " Local enrichment " region of Present Domestic has had the technical method adapting at present, but how to realize and effectively employ and efficiently involve and how the rich sewage in oil field realizes zero-emission for " generally distribute " remaining oil, still lack economic, effective means efficiently, in the urgent need to finding new economy, efficiently improve oil recovery factor and sewage utilizes technical method.We have invented a kind of new oilfield sewage that utilizes and have improved fault block oil reservoir recovery ratio method for this reason, have solved above technical problem.
Summary of the invention
The object of the present invention is to provide and utilize oilfield sewage to improve fault block oil reservoir recovery ratio method, it forms artificial edge water drive by optimization energy arbitrary way re-injection oilfield sewage and to realize oilfield sewage, reduces discharging and increase substantially the object of oil recovery factor.
In order to reach above-mentioned purpose, the present invention has adopted following technical scheme, utilizes oilfield sewage to improve fault block oil reservoir recovery ratio method, and its step comprises:
The step in selected fault block oil reservoir region;
In the step of the well pattern of fault block oil reservoir regionl development water injection well and the combined form of producing well, the well pattern form that described water injection well and producing well adopt is wide spacing, two-way mistake is right;
Select well to stablize the step of the mode of the oil recovery of water injection well cycle or the oil recovery of well cyclic waterflooding oil well cycle, wherein injection-production ratio keeps more than 1.0, finally utilizes oilfield sewage in fault block oil reservoir region, to form the artificial edge water drive that improves fault block oil reservoir recovery ratio.
The step in described selected fault block oil reservoir region, wherein select fault block oil reservoir region, should meet the following conditions: fault block is closed or has lithologic boundary, reservoir formation viscosity of crude < 20mPa.s, oil reservoir initial condition oil volume is than < 100, stratigraphic dip, oil-containing strip width numerical point are distributed in corresponding effective pay thickiness screening region, plate upper right side, oil reservoir horizontal permeability > 200 * 10
-3μ m
2.
Described well pattern also adopts many wells well pattern form that note, periferal water flooding, row's shape note are adopted less.
Described water injection well is straight well form, and producing well is straight well or horizontal well form.
The well pattern form of described wide spacing is specially adjacent water injection well and producing well at a distance of 500m-1000m.
In the fault block oil reservoir region of generally shorting, first large discharge capacity return water build the pressure to strata pressure be 0.8Pi～1.2Pi, after oil well drives a well, can keep higher liquid measure to produce.
Compared to prior art, the present invention has following beneficial effect:
The oilfield sewage that utilizes in the present invention improves fault block oil reservoir recovery ratio method, by optimization energy arbitrary way re-injection oilfield sewage, form artificial edge water drive, can realize increase reservoir water drive control reserves, effectively makeup energy, expand water drive and involve, slow down limit overflow and enter with bottom water coning, effectively alleviate 5 general objectives such as wastewater disposition problem.This technical method can for further excavating old filed potentiality in oil field, make great efforts to increase economically recoverable in fault block oil reservoir development late stage, strengthens the basis of exploiting natural resources, and further improving oil recovery factor provides a kind of reliable new method.This technological invention popularizing application prospect is wide, remarkable economic and social benefits.
Accompanying drawing explanation
Fig. 1 is the flow chart that utilizes oilfield sewage to improve fault block oil reservoir recovery ratio method of the present invention;
Fig. 2 is the different effective pay thickiness condition sub-surfaces of artificial edge water drive fault block oil reservoir inclination angle, oil-containing strip width screening figure in a specific embodiment of the present invention;
Fig. 3 be in a specific embodiment of the present invention the artificial two-way mistake of edge water drive fault block oil reservoir to row's shape flooding pattern figure.
The specific embodiment
Relevant detailed description of the present invention and technology contents, coordinate accompanying drawing to be described as follows, yet accompanying drawing only provides the use of reference with explanation, is not used for the present invention to be limited.
As shown in Figure 1, the oilfield sewage that utilizes of the present invention improves fault block oil reservoir recovery ratio method, and its step is as follows:
In step 101, according to the geology of oil reservoir, oil property and exploitation situation, screen.This oil reservoir meets the following conditions: fault block should seal or have lithologic boundary, reservoir formation viscosity of crude < 20mPa.s(viscosity ratio of oil and water < 50), oil reservoir initial condition oil volume is than < 100, stratigraphic dip, oil-containing strip width numerical point are distributed in corresponding effective pay thickiness screening region, plate upper right side, oil reservoir horizontal permeability > 200 * 10
-3μ m
2.Flow process enters into step 102.
In step 102, reservoir oil well hole condition is analyzed and researched, clearly can utilize well number, the pound sign of old well.Flow process enters into step 103.
In step 103, according to the geology of oil reservoir, exploitation actual state, the combination of Reasonable Well type, Well Pattern And Spacing, oil-water well working system, formation pressure maintenance level, the note of determining produced-water reinjection exploitation adopted liquid measure, injection-production ratio and the best technical policies such as opportunity that drive a well, reaching energy-saving and emission-reduction, significantly mention the object of recovery ratio.Flow process finishes.
From stage economic factor, consider the well type combining form tool some superiority of straight well water filling, horizontal well production.
Flooding pattern also can select wide spacing, two-way mistake to, " many wells are noted less ", aquifer injection, row's shape flooding pattern form.
Rate and the adaptive problem of tubing string when economically, oil-water well working system selects to need consideration oil-water well to drive a well.
For Extra-high-water-cut stage sewage, face the pressure of reduction of discharging and the difficult point that Complex Fault Block Oil Reservoir increases substantially waterflood recovery efficiency factor, the present invention uses for reference the efficient successfully development Experience of the limit that Edge water energy is stronger (end) water fault block oil reservoir, by large discharge capacity re-injection oilfield sewage outside optimization energy arbitrary way edge or limit, form artificial edge water drive water drive oil development technique, provide a kind of oilfield sewage that efficiently utilizes to improve fault block oil reservoir oil recovery factor method.The method not only can solve the processing discharge of oilfield sewage and efficiently utilize a difficult problem, and can solve the problem of effectively employing He efficiently involving in remaining oil " generally distribution " region, thereby realize the object that oilfield sewage reduced discharging and increased substantially oil recovery factor.
Embodiment 1:
According to Fig. 2 and Fig. 3, oil field 1 is the narrow ridge fault block oil reservoir of an exemplary ribbon, reservoir buried depth 1950m, oil area 0.92km
2, effective pay thickiness 9.3m, degree of porosity 27.5%, air permeability 673 * 10
-3μ m
2, oil viscosity 9.3mPa.s, oil in place 119 * 10
4t, oil reservoir initial condition oil volume ratio is about 10,12.5 ° of stratigraphic dips, the long 3.6km of oil-containing strip width, wide 100m-250m.Before test, open 1 mouthful of oil well, day produce oil 0.4t/d, comprehensive water cut 97.7%, producing fluid level 800m, recovery percent of reserves 31.5%, enters ultra-high water-containing, nearly technology abandonment stage.
(1) according to the geologic feature of oil reservoir, oil property and exploitation situation, screen.This oil reservoir meets the following conditions: fault block should seal or have lithologic boundary, reservoir formation viscosity of crude < 20mPa.s(viscosity ratio of oil and water < 50), stratigraphic dip, oil-containing strip width numerical point are distributed in corresponding effective pay thickiness screening region, plate upper right side, oil reservoir horizontal permeability > 200 * 10
-3μ m
2.
(2) through to reservoir oil well hole condition investigation, the adjacent piece of water injection well utilization carries out outside limit outside wide spacing limit the injection recovery energy that builds the pressure without the old Jing8Kou of value; Form after the water of artificial strong limit, high-order bit hold up stop 2 mouthfuls of oil wells, on return 2 mouthfuls of perforations adding oil wells.
(3) select two-way mistake to row's shape flooding pattern, injector producer distance 500m-1000m.
(4) outside limit, individual well day note 200m in advance
3/ d-500 m
3/ d injection builds the pressure, and opens all day liquid 50 m of well recovery after half a year or 1 year
3/ d-150 m
3/ d.Water injection well is stablized water filling, and the producing well cycle recovers the oil.Injection-production ratio remains on 1.0 left and right.
At present first cycle development amount has approached, in the situation that whole experimental stage is not bored new well, and oily 17.1t/d of average day at initial stage of oil well, moisture 60.0%, blowing or liquid level are at well head, and unit day oil is up to 54.6t/d; Open at present 3 mouthfuls of oil wells, average individual well day oil 10.2t/d, moisture 97.4%, accumulated and increased oil 5.7 * 10
4t, improves recovery ratio 4.8%; Aquifer injection well drives a well 7 mouthfuls, average individual well day note 260m
3/ d, tired re-injection oil field water 165.6 * 10
4m
3, obtain 1.4 hundred million yuan of economic benefits.Sewage reduces discharging, raising recovery ratio development effectiveness is remarkable, has obtained good economic results in society.
The foregoing is only preferred embodiment of the present invention, non-in order to limit the scope of the claims of the present invention, other use the equivalence of patent spirit of the present invention to change, and all should all belong to the scope of the claims of the present invention.
Claims (6)
1. utilize oilfield sewage to improve fault block oil reservoir recovery ratio method, its step comprises:
The step in selected fault block oil reservoir region;
In the step of the well pattern of fault block oil reservoir regionl development water injection well and the combined form of producing well, the well pattern form that described water injection well and producing well adopt is wide spacing, two-way mistake is right;
Select well to stablize the step of the mode of the oil recovery of water injection well cycle or the oil recovery of well cyclic waterflooding oil well cycle, wherein injection-production ratio keeps more than 1.0, finally utilizes oilfield sewage in fault block oil reservoir region, to form the artificial edge water drive that improves fault block oil reservoir recovery ratio.
2. the oilfield sewage that utilizes according to claim 1 improves fault block oil reservoir recovery ratio method, it is characterized in that, the step in described selected fault block oil reservoir region, wherein select fault block oil reservoir region, should meet the following conditions: fault block is closed or has lithologic boundary, reservoir formation viscosity of crude < 20mPa.s, oil reservoir initial condition oil volume is than < 100, stratigraphic dip, oil-containing strip width numerical point are distributed in corresponding effective pay thickiness screening region, plate upper right side, oil reservoir horizontal permeability > 200 * 10
-3μ m
2.
3. the oilfield sewage that utilizes according to claim 1 improves fault block oil reservoir recovery ratio method, it is characterized in that, described well pattern also adopts many wells well pattern form that note, periferal water flooding, row's shape note are adopted less.
4. the oilfield sewage that utilizes according to claim 1 improves fault block oil reservoir recovery ratio method, it is characterized in that, described water injection well is straight well form, and producing well is straight well or horizontal well form.
5. the oilfield sewage that utilizes according to claim 1 improves fault block oil reservoir recovery ratio method, it is characterized in that, the well pattern form of described wide spacing is specially adjacent water injection well and producing well at a distance of 500m-1000m.
6. the oilfield sewage that utilizes according to claim 1 improves fault block oil reservoir recovery ratio method, it is characterized in that, in the fault block oil reservoir region of generally shorting, first large discharge capacity return water build the pressure to strata pressure be 0.8Pi～1.2Pi, after oil well drives a well, can keep higher liquid measure to produce.
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Cited By (7)
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| CN107461178A (en) * | 2017-08-29 | 2017-12-12 | 中国海洋石油总公司 | A kind of method of evaluation cycle flood effectiveness |
| CN108180007A (en) * | 2017-12-26 | 2018-06-19 | 中国石油化工股份有限公司 | Old filed economic limit drilling well potentiality and recovery ratio measuring and calculating new method |
| CN109281648A (en) * | 2018-09-27 | 2019-01-29 | 中国石油天然气股份有限公司 | The method and apparatus for determining the reasonable well pattern density of oil reservoir |
| WO2019223346A1 (en) * | 2018-05-25 | 2019-11-28 | 中国石油大学(华东) | Nitrogen composite huff-puff method for closed fault block oil reservoir |
| CN114542031A (en) * | 2022-01-26 | 2022-05-27 | 中国石油天然气股份有限公司长庆油田分公司第八采油厂 | Injection-production regulation method for irregular edge water reservoir for crack development |
| CN114592837A (en) * | 2020-12-04 | 2022-06-07 | 中国石油天然气股份有限公司 | Injection and production adjusting method for horizontal well row shape facing injection and production well pattern in high water-cut period |
| CN115422789A (en) * | 2022-11-07 | 2022-12-02 | 中国石油大学(华东) | Prediction method and system for optimizing water drive recovery ratio of fault block oil reservoir in consideration of whole process |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107461178A (en) * | 2017-08-29 | 2017-12-12 | 中国海洋石油总公司 | A kind of method of evaluation cycle flood effectiveness |
| CN108180007A (en) * | 2017-12-26 | 2018-06-19 | 中国石油化工股份有限公司 | Old filed economic limit drilling well potentiality and recovery ratio measuring and calculating new method |
| CN108180007B (en) * | 2017-12-26 | 2021-11-16 | 中国石油化工股份有限公司 | New method for measuring and calculating economic ultimate drilling potential and recovery ratio of old oil field |
| WO2019223346A1 (en) * | 2018-05-25 | 2019-11-28 | 中国石油大学(华东) | Nitrogen composite huff-puff method for closed fault block oil reservoir |
| CN109281648A (en) * | 2018-09-27 | 2019-01-29 | 中国石油天然气股份有限公司 | The method and apparatus for determining the reasonable well pattern density of oil reservoir |
| CN109281648B (en) * | 2018-09-27 | 2020-10-09 | 中国石油天然气股份有限公司 | Method and apparatus for determining a reasonable well pattern density of an oil reservoir |
| CN114592837A (en) * | 2020-12-04 | 2022-06-07 | 中国石油天然气股份有限公司 | Injection and production adjusting method for horizontal well row shape facing injection and production well pattern in high water-cut period |
| CN114592837B (en) * | 2020-12-04 | 2024-04-30 | 中国石油天然气股份有限公司 | Injection and production adjustment method for horizontal well row shape opposite to injection and production well pattern in high water content period |
| CN114542031A (en) * | 2022-01-26 | 2022-05-27 | 中国石油天然气股份有限公司长庆油田分公司第八采油厂 | Injection-production regulation method for irregular edge water reservoir for crack development |
| CN115422789A (en) * | 2022-11-07 | 2022-12-02 | 中国石油大学(华东) | Prediction method and system for optimizing water drive recovery ratio of fault block oil reservoir in consideration of whole process |
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