CN102777157B - CO2 drive oil-gas-water separate well injecting oil reservoir mixing drive development method - Google Patents

CO2 drive oil-gas-water separate well injecting oil reservoir mixing drive development method Download PDF

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CN102777157B
CN102777157B CN201110123871.9A CN201110123871A CN102777157B CN 102777157 B CN102777157 B CN 102777157B CN 201110123871 A CN201110123871 A CN 201110123871A CN 102777157 B CN102777157 B CN 102777157B
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well
gas
injection
oil
water
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CN102777157A (en
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计秉玉
赵淑霞
何应付
廖海婴
吕成远
周银邦
王强
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China Petroleum and Chemical Corp
Sinopec Exploration and Production Research Institute
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China Petroleum and Chemical Corp
Sinopec Exploration and Production Research Institute
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Abstract

The invention provides a CO2 drive oil-gas-water separate well injecting oil reservoir mixing drive development method, and belongs to the field for improving recovery ratio of an oil reservoir. The method comprises the following steps of: firstly, determining a development well pattern, well spacing and a development layer system of the oil reservoir; then, utilizing an overall process numerical simulation technique to determine advantage seepage direction and sweep efficiency of injection gas, designing an injection well in the advantage seepage direction of the injection gas as a water injection well, designing other injection wells as a gas injection well, forming water-gas mixed drive of partial water injected to well and partial gas injected into well; and finally determining the injection parameter of an injection production well and the development index forecast of a whole region. The method can form a water barrier in a gas channeling direction, thereby effectively controlling gas channeling, enlarging swept volume of the injected gas, and improving recovery efficiency; and the method provided by the invention has excellent guiding function on the gas injection drive oil well pattern, well type and injection and production parameter of a developed block and an undeveloped block, and the application prospect is wide.

Description

A kind of CO 2displacement of reservoir oil air water different well injection oil reservoir is mixed drives development approach
Technical field
The invention belongs to and improve oil recovery field, be specifically related to a kind of CO 2displacement of reservoir oil air water different well injection oil reservoir is mixed drives development approach.
Background technology
Along with the impact of greenhouse effect on world climate manifests day by day, CO 2become one of focus that people pay close attention to the most.Bury CO 2be one of effective way avoiding climate change, what geological storage was generally considered following main flow buries mode, and wherein has most the geologic structure storing potentiality to be exploiting or exhausted oil field or gas field.
China's major part reservoir, oil field belongs to continental deposit, serious heterogeneity, and viscosity of crude is higher.Such oil reservoir moisture percentage rises fast, even if adopt the note of strengthening to adopt measure, waterflood recovery efficiency factor is still very low.For improving oil recovery factor, develop remaining reserves to greatest extent, the Application and Development of tertiary oil recovery technology is imperative.And CO 2drive and improve the advantages such as recovery efficiency technique is large with its scope of application, oil displacement efficiency is high, cost is lower, be subject to the remarkable attention of countries in the world.Current CO 2technology of reservoir sweep application scale and production gain are only second to heavy crude heat extraction, become the technology of second largest raising recovery ratio.Since 2000, domestic difficult for waterflood development of low-permeability reservoirs, that recovery ratio is low problem has carried out CO 2the desk research of the displacement of reservoir oil and ASP flooding test, achieve good effect.
From Development Finance, injection gas displacement mainly adopts continuous gas injection, water alternating gas injection, and huff and puff oil recovery and cycle inject four kinds of modes, and well pattern form is trial zone whole district gas drive.The feature of these four kinds of modes is as follows: often gas sweep efficiency is less in continuous gas injection, particularly for the reservoir of serious heterogeneity, breaks through very early, improves recovery ratio amplitude less; Water alternating gas injection can improve the sweep efficiency of injected gas, but can cause water shielding and CO 2bypass oil, water injection pressure rises, and serious etching problem; Huff and puff oil recovery mode is generally applicable to the less mining type of scale, and its recovery ratio is lower; Cycle injection mode CO 2tempo of penetration relatively slow down, but it is fast to stop note phase pressure drop, and stratum ability keeps situation poor.These problems are CO 2the practical problem produced in gas drive process is also affect CO for a long time 2the key issue that technology of reservoir sweep is promoted.
Summary of the invention
The object of the invention is to solve the difficult problem existed in above-mentioned prior art, a kind of CO is provided 2displacement of reservoir oil air water different well injection oil reservoir is mixed drives development approach, and injected by gas, the different well of water, while maintenance stratum energy, effectively can control has channeling, delay gas break through, that avoids Injection Well Water Alternate Gas to bring shorts and etching problem.
The present invention is achieved by the following technical solutions:
A kind of CO 2the different well of displacement of reservoir oil air water injects that oil reservoir is mixed drives development approach, and first described method determines the well pattern of oil reservoir, well spacing and straticulate exploration; Then the advantage seepage direction of whole-course numerical modeling technology determination injecting gas is utilized, and then the Injection Well on injected gas advantage seepage direction (namely causing has channeling direction faster) is designed to water injection well, other Injection Well is designed to gas injection well, and the aqueous vapor of the water filling of forming section well, the gas injection of part well is mixed drives; Finally determine the injection parameter of injection-production well and the development index predication of the whole district.
Said method comprising the steps of:
(1) according to geological research data, the oil-gas field development data such as monitoring materials and oil-water well Production development in work area, the offtake pattern of oil reservoir, well spacing and straticulate exploration is determined; Described geological research data comprises ground stress analysis data, fracture intensity data, physical characterization data; Described monitoring materials comprises well test analysis data, tracer research data;
(2) utilize whole-course numerical modeling technology, be on the basis of gas well entirely at supposition Injection Well, determine the advantage seepage direction of injected gas, and add up producing well gas breakthrough time and the oil-gas ratio rate of climb; And further the morning and evening that producing well reaches the economic limit oil-gas ratio time according to oil-gas ratio is sorted;
(3) according to geologic information and by the injected gas advantage seepage direction determined in step (2) and the oil-gas ratio rate of climb, the Injection Well that gassed-out well is corresponding is found;
(4) Injection Well that step (3) finds is designed to water injection well, other well is still designed to gas injection well, drives exploitation like this with regard to the aqueous vapor of forming section well water filling part well gas injection is mixed;
(5) on the basis of step (4), the injection parameter design of water filling and gas injection is carried out respectively;
(6) offtake pattern, well spacing and the straticulate exploration that obtain according to step (1), the Injection Well determined according to step (4) not and the injection parameter designed by step (5), are not carried out aqueous vapor and are mixed the development index predication driven.
Compared with prior art, the invention has the beneficial effects as follows: the notable feature of this invention is that the different well of aqueous vapor injects, and mixes drive in underground formation aqueous vapor; The method can form water barrier on has channeling direction, thus effectively controls has channeling, expands the swept volume of injected gas, improves recovery ratio.The present invention improves gas injection recovery ratio by the new well pattern of design and new injection mode, compared with the conventional method, utilizes method of the present invention, recovery ratio reaches 19.62%, comparatively water drive improves 8.53%, and comparatively continuous gas injection improves 1.6%, and comparatively cycle gas injection improves 0.70%.The present invention is mainly used in Eor By Gas Injection project, to the injection gas displacement well pattern of development block and untapped block, well not and note adopt parameter designing there is good directive function, have a extensive future.
Accompanying drawing explanation
Fig. 1 is the comparing result figure of the oil-gas ratio that the inventive method and continuous gas injection technology obtain.
To be that the aqueous vapor that utilizes the inventive method to obtain is mixed drive well net deployment result figure to Fig. 2.
Fig. 3 is the comparing result figure of the recovery ratio that the inventive method and continuous gas injection technology obtain.
Fig. 4 is that the inventive method and continuous gas injection technology are at finish time oil well closing well number comparing result figure.
Detailed description of the invention
Below in conjunction with accompanying drawing and to note CO in certain oil field 2scheme in displacement of reservoir oil reservoir engineering is that example is to illustrate implementation process of the present invention and relevant effect.
The first step: according to the geological research data in oil field, monitoring materials and oil-water well Production development data, determine that the offtake pattern of oil reservoir is line pattern, well spacing is 500m*180m, and straticulate exploration is blue or green one I, blue or green 2 V.
Second step: on the basis of whole district's gas drive, utilizes whole-course numerical modeling to calculate and carries out analog computation.According to result of calculation statistics producing well gas breakthrough time and has channeling time; And further the morning and evening that producing well reaches the economic limit oil-gas ratio time according to oil-gas ratio is sorted, shown in table 1 is the statistics of DB33 block part oil well has channeling time in this oil field.
Oil-gas ratio Gas breakthrough time (year) The has channeling time (year)
33-1-1 1.0 6.0
33-1-2 0.5 6.0
33-1-3 0.5 Nothing
33-1-4 0.5 Nothing
33-1-5 3.0 Nothing
33-1-6 0.5 3.5
33-1-7 1.0 4.0
33-1-9 1.0 4.0
33-10-10 3.0 Nothing
33-10-5 0.5 4.5
33-11-3 1.5 Nothing
33-11-5 0.5 4.5
33-11-6 0.5 5.0
33-11-7 0.5 3.5
33-11-8 0.5 2.0
33-11-9 3.5 Nothing
33-12-10 3.5 Nothing
33-12-4 0.5 4.5
33-12-6 1.0 2.5
33-13-7 0.5 3.5
33-13-8 0.5 3.5
33-13-9 1.0 4.0
33-14-4 2.0 Nothing
33-15-5 3.0 Nothing
33-15-6 0.5 4.0
33-15-7 1.0 Nothing
33-16-6 0.5 3.0
33-17-5 0.5 4.5
33-17-6 0.5 2.0
33-17-7 0.5 4.5
Table 1
3rd step: according to numerical simulation result, Injection Well corresponding to the well of has channeling speed is revised as water injection well, in such as table 1, the has channeling gas injection well that well 33-11-7 is corresponding is faster 33-10-6, therefore 33-10-6 is designed to water injection well, the has channeling Injection Well that well 33-1-6 is corresponding is faster 33-2-6, therefore 33-2-6 is designed to water injection well.Shown in table 2 is other design result of part Injection Well well in DB33 block, and the water injection well in table 2 correspond to has channeling well faster in table 1, and gas injection well correspond to the slower well of has channeling.
Table 2
4th step: on the basis of the 3rd step, carries out the parameter designing of water filling and gas injection.Gas injection system pressure 20MPa, well intake pressure 16.0MPa; The pressure 20Mpa of current flood pattern is continued to use in water filling.Average individual well day gas injection rate 45-50t/d; The water filling of individual well day keeps current diurnal injection 30-40m 3/ d.
5th step: not and injection parameter, carry out aqueous vapor and mix the development index predication driven, DB33 block development index predication result is not as shown in table 3 for the well pattern determined according to aforementioned, straticulate exploration, Injection Well.
Time (a) Oil well (mouth) Gas injection well (mouth) Water injection well (mouth) Day gas injection (t/d) Day water filling (m 3/d) Day produce oil (t/d) Tired produce oil (10 4t) Daily output water (m 3) Daily gas (10 4m 3) Comprehensive water cut (%) Gas-oil ratio (m 3/m 3)
2009 69 12 14 100 673 180.0 13.26 609 1.8 74.4 84
2010 69 12 14 401 784 200.3 20.57 509 8.1 68.6 349
2011 69 12 14 401 785 233.5 29.10 764 20.5 73.8 754
2012 69 12 14 402 787 203.8 36.54 798 20.4 77.1 863
2013 69 12 14 401 783 188.0 43.40 842 24.0 79.4 1097
2014 69 12 14 401 783 174.9 49.78 904 25.8 81.6 1268
2015 69 12 14 401 781 162.6 55.72 898 24.2 82.6 1278
2016 69 12 14 402 781 151.2 61.24 827 22.3 82.5 1271
2017 69 12 14 401 777 140.7 66.37 816 21.0 83.3 1286
2018 69 12 14 401 768 130.8 71.15 793 20.0 83.9 1318
2019 69 12 14 401 766 121.6 75.59 787 22.2 84.8 1567
2020 69 12 14 402 758 113.1 79.71 788 21.9 85.7 1667
2021 69 12 14 401 742 105.2 83.56 768 20.0 86.3 1631
2022 69 12 14 401 691 97.8 87.13 636 16.8 84.8 1477
2023 69 12 14 393 644 91.0 90.45 594 17.4 84.9 1649
2024 69 12 14 381 591 84.6 93.54 535 14.6 84.5 1485
2025 69 12 14 383 583 78.7 96.41 498 14.7 84.5 1604
Table 3
What Fig. 2 showed is the well net deployment result utilizing the inventive method to obtain, and clearly can find out DB33 block water injection well and gas injection well distribution from Fig. 2, and due to underground sand-body distribution complexity, makes water injection well and gas injection well distribution be irregular.
As shown in figures 1 and 3, contrast the present invention and existing continuous gas injection technology, the oil-gas ratio that in Fig. 11 obtains for continuous gas injection method, 2 for adopting the oil-gas ratio of the inventive method acquisition, 3 recoverys percent of reserves obtained for continuous gas injection method in Fig. 3,4 is the recovery percent of reserves adopting the inventive method to obtain, after can finding out use method of the present invention from Fig. 1 and Fig. 3, the oil-gas ratio rate of climb is slack-off, and recovery ratio increases.In the contrast of production finish time oil well closing well number as shown in Figure 4, can find out and utilize the closing well number of the inventive method will be less than the closing well number utilizing existing continuous gas injection, this illustrates that this method can extend the Production Life of producing well in gas injection development oil reservoir, extend the production time of oil well, improve the development effectiveness of oil reservoir.
The amplitude that the present invention improves recovery ratio is injected lower slightly compared with Water Alternate Gas, but far away higher than cycle gas injection and continuous gas injection, is a kind of CO with popularizing application prospect 2displacement of reservoir oil development approach.
Technique scheme is one embodiment of the present invention, for those skilled in the art, on the basis that the invention discloses application process and principle, be easy to make various types of improvement or distortion, and the method be not limited only to described by the above-mentioned detailed description of the invention of the present invention, therefore previously described mode is just preferred, and does not have restrictive meaning.

Claims (1)

1. a CO 2the different well of displacement of reservoir oil air water injects that oil reservoir is mixed drives development approach, it is characterized in that: first described method determines the well pattern of oil reservoir, well spacing and straticulate exploration; Then whole-course numerical modeling technology determination injecting gas advantage seepage direction and sweep efficiency is utilized, and then the Injection Well on injected gas advantage seepage direction is designed to water injection well, other Injection Well is designed to gas injection well, and the aqueous vapor of the water filling of forming section well, the gas injection of part well is mixed drives; Finally determine the injection parameter of injection-production well and the development index predication of the whole district; Said method comprising the steps of:
(1) according to geological research data, the oil-gas field development data such as monitoring materials and oil-water well Production development in work area, the offtake pattern of oil reservoir, well spacing and straticulate exploration is determined; Described geological research data comprises ground stress analysis data, fracture intensity data, physical characterization data; Described monitoring materials comprises well test analysis data, tracer research data;
(2) utilize whole-course numerical modeling technology, be on the basis of gas well entirely at supposition Injection Well, determine the advantage seepage direction of injected gas, and add up producing well gas breakthrough time and the oil-gas ratio rate of climb; And further the morning and evening that producing well reaches the economic limit oil-gas ratio time according to oil-gas ratio is sorted;
(3) according to geologic information and by the injected gas advantage seepage direction determined in step (2) and the oil-gas ratio rate of climb, the Injection Well that gassed-out well is corresponding is found;
(4) Injection Well that step (3) finds is designed to water injection well, other well is still designed to gas injection well, drives exploitation like this with regard to the aqueous vapor of forming section well water filling part well gas injection is mixed;
(5) on the basis of step (4), the injection parameter design of water filling and gas injection is carried out respectively;
(6) offtake pattern, well spacing and the straticulate exploration that obtain according to step (1), the Injection Well determined according to step (4) not and the injection parameter designed by step (5), are not carried out aqueous vapor and are mixed the development index predication driven.
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CN104453804B (en) * 2014-10-17 2017-02-15 中国海洋石油总公司 Dynamic monitoring and evaluating method for gas-drive reservoir development
CN105626006B (en) * 2014-11-07 2018-01-16 中国石油化工股份有限公司 Low-permeability oil deposit CO2Drive technical limit well space and determine method
CN104462859A (en) * 2014-12-31 2015-03-25 中国石油天然气股份有限公司 Oil and gas resource recovery coefficient determining method
CN107060705B (en) * 2017-04-10 2019-02-19 中国石油大学(北京) A kind of CO2Oil reservoirs has channeling channel dynamic playback method
CN107355680B (en) * 2017-07-19 2019-06-04 陕西延长石油(集团)有限责任公司研究院 A kind of CO2Trapping, conveying, using with seal full-flow process up for safekeeping
CN111236898B (en) * 2018-11-28 2021-11-23 中国石油化工股份有限公司 Method for improving recovery ratio based on stagnant gas
CN111400854B (en) * 2019-01-03 2023-05-23 中海石油(中国)有限公司 Gas injection breakthrough time prediction method for gas injection miscible oil displacement reservoir
CN109884726B (en) * 2019-03-07 2020-08-04 中国石油大学(北京) Gas-drive reservoir gas-visible time prediction method and device
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CN113139265B (en) * 2020-01-17 2022-11-04 中国石油天然气股份有限公司 Gas channeling direction determination method and device based on buried hill oil and gas reservoir gas injection development
CN113389531A (en) * 2020-03-12 2021-09-14 中国石油化工股份有限公司 CO2Injection-production method, electronic device, and medium
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