CN1514106A - Method of optimizing trielement composite central displacement system interface tension and trielement system formulation - Google Patents

Method of optimizing trielement composite central displacement system interface tension and trielement system formulation Download PDF

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CN1514106A
CN1514106A CNA031008879A CN03100887A CN1514106A CN 1514106 A CN1514106 A CN 1514106A CN A031008879 A CNA031008879 A CN A031008879A CN 03100887 A CN03100887 A CN 03100887A CN 1514106 A CN1514106 A CN 1514106A
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oil
displacement
ternary
oil displacement
interfacial tension
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戚连庆
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Daqing Oilfield Co Ltd
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Daqing Oilfield Co Ltd
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Abstract

A method for optimizing the interface tension of three-element oil-displacing system and the formula of three-element system includes digital simulation on 3D geologic model, experimenting on 3D oil-displacing model, and combining their results to determine the interface temsion of system and the formula of three-element system. Its advantages are high oil output increased by 3-5% and low cost of chemical (decreased by 30-50%).

Description

The method of system interfacial tension and ternary system prescription in the optimization ternary composite driving
Technical field
The present invention relates to determining of three-component compound system in the tertiary oil production in oil field, be specifically related to system interfacial tension and ternary system optimization of formulation method.
Background of invention
Ternary composite driving is as a kind of flooding method efficiently, a series of achievements in laboratory experiment, numerical simulation, field test, have been obtained, receive in field test that particularly well water descends significantly, final recovery percent of reserves improves about 20% gratifying results than water drive, thereby shows good prospects for application.
The dominant ideas of present ternary composite driving are that the interfacial tension of system must guarantee 1 * 10 -2MN/m＜σ＜1 * 10 -5MN/m, subconsciousness is that interfacial tension is low more good more; For fear of absorption the system interfacial tension is exerted an influence, and the table of getting relative higher concentration live agent, alkali, enlarge spread effect in the oil displacement process and get higher relatively polymer concentration for improving because of the agent of showing to live; The preferred main research means of prescription is " experimental exploring ": analyze by experiment, find in the bigger concentration range of span, the interfacial tension that meets the demands is arranged between system and the crude oil, reach by oil displacement experiment and improve the technical indicator of recovery ratio more than 20%.In experiment, mainly adopt: 1) one dimension " column rock core " oil displacement experiment, rock core is " natural " rock core or " artificial " rock core; 2) two dimension " long strip type rock core " oil displacement experiment, rock core is an artificial core, hierarchy, every layer has different permeabilities, claims this model to be " two-dimensional section model " usually; 3) three-dimensional " plane homogeneous vertical heterogeneity " model oil displacement experiment, model is got 1/4th of a well group of oil field Five-point method pattern, dwindle by geometric similarity and to make threedimensional model, vertically go up and be hierarchy, every layer plane homogeneous, each layer permeability difference is so claim " plane homogeneous vertical heterogeneity " model.It should be noted that the threedimensional model oil displacement experiment is more near the actual displacement of reservoir oil situation of oil reservoir, yet because the threedimensional model manufacturing is difficult relatively, and experimental period is long, difficulty is big, main is not enough to the necessity understanding of dimensional model experiment, substantially, abandon dimensional model experiment at present, and get threedimensional model reduced form---" two-dimensional section model " experimentizes, carry out by experiment ternary system prescription and the displacement of reservoir oil scheme optimization screening.
Yet ore deposit factory result of the test shows, adopts the oil displacement test of the displacement of reservoir oil scheme that above method preferably fills a prescription, the recovery ratio improvement value can not be stabilized in more than 20%, too much because of the chemical agent consumption again, and for satisfy technical requirements often adopt the high price imported raw material, thereby economic benefit is undesirable; Simultaneously field trial exposes problems again, because of the guarantee system ultralow interfacial tension has used higher concentration highly basic, occurs thus causing the destruction of equipment very serious because of underground fouling causes to the injury of oil reservoir with because of corrosion.Thus, the research of ternary composite driving is at present used and is in the situation of fluctuating, and the ternary composite driving oil tech is pushed industrial applications to and more faced many obstacles.
Summary of the invention
The objective of the invention is to break through the multiple restriction of existing ternary composite driving, a kind of method of optimizing system interfacial tension and ternary system prescription in the ternary composite driving is provided.The present invention adopts this high-tech means of numerical simulation study, displacement of reservoir oil feature to ternary composite driving, mechanism of oil displacement is furtherd investigate, obtain new understanding, the research method that ternary composite driving research must be carried out on threedimensional model is proposed thus, found the optimization range that influence rule and interfacial tension of system interfacial tension to oil displacement efficiency, found system to form the displacement of reservoir oil prescription that influence rule and optimization of change in concentration to oil displacement efficiency, by oil displacement experiment system interfacial tension optimization range is examined correction at threedimensional model, further optimize filling a prescription, experimental result indicates that the displacement of reservoir oil scheme based on preferred prescription further improves recovery ratio, and further reduce the ternary composite driving input cost, thereby the economic technology benefit is increased substantially.
The method of system interfacial tension and ternary system prescription in the optimization ternary composite driving provided by the invention, be in the analog study of the enterprising line number value of three-dimensional geological model, on three-dimensional oil displacement experiment model, carry out the physical analogy oil displacement experiment, and both are combined determine system interfacial tension and ternary system prescription.
Wherein, described numerical simulation study comprises:
Oil displacement efficiency when 1) calculating with method for numerical simulation that system is formed change in concentration in the ternary composite driving; Analysis result is set the oil displacement efficiency optimum value; Satisfy the calculation optimization scope of each concentration of component of optimum value condition correspondence, the ternary oil displacement system prescription that obtains calculating for each concentration of component;
Oil displacement efficiency when 2) calculating the variation of oil displacement system interfacial tension with method for numerical simulation; Analysis result is set the oil displacement efficiency optimum value; The system interfacial tension that satisfies optimum value condition correspondence is defined as the calculation optimization scope, the optimization system interfacial tension that obtains calculating.
Described physical analogy oil displacement experiment comprises:
1) with the physical analogy oil displacement experiment to the ternary oil displacement system prescription of the calculating that obtains by the numerical simulation study examination correction that experimentizes;
2) with the physical analogy oil displacement experiment to the optimization system interfacial tension of the calculating that obtains by the numerical simulation study examination correction that experimentizes.
In the method that system interfacial tension and ternary system are filled a prescription in the above-mentioned optimization ternary composite driving, described three-dimensional geological model is determined according to the on-the-spot oil reservoir situation of the displacement of reservoir oil, be specially a simplified model: model structure is got 1/4th of a well group of " five-spot " well pattern, contain notes one and adopt Liang Koujing, oil reservoir plane homogeneous, vertical heterogeneity divides the uniform thickness three layer construction, the layering permeability difference of different coefficient of permeability variation correspondences is abideed by the oil reservoir heterogeneous body rhythm situation substratum is arranged; For reflecting physicochemical change in the oil displacement process better, should get more relatively grid between well, recommend to get Nx=Ny=9, on the plane 81 grids; Determine the required geology of analog computation, fluid related data with reference to oil field reservoir geology and characteristic of fluid.
Use application software in the described numerical simulation calculation research, described application software has following main feature and function: it has materializing procedure complicated in pair oil displacement process perfect description relatively in detail, has description simultaneously to the main mechanism of oil displacement of ternary composite driving under rare system, promptly under the ternary system condition, low concentration surfactant, the cooperative effect of aqueous slkali, and produce ultralow interfacial tension between the crude oil, make the hollow billet number increase substantially, make that therefrom but the residual oil that can not flow reaches flow regime, again owing to polymer in the system exists solution that higher relatively viscosity is arranged, driving the liquid and the suitable relatively mobility ratio of formation between the crude oil that can flow thus, realization has high oil displacement efficiency to the remaining later residual oil extraction of water drive; Software should have computing function fast, can not only be used for mechanism of oil displacement research, and certain computational engineering practical problem ability should be arranged.
Calculating parameter is definite when using above-mentioned software:
The key parameter that requires in the calculating is live interfacial tension figure between agent, aqueous slkali and the crude oil and polymer, an alkaline concentration viscosity relationship curve of table, and these parameters should be the table selected for use the data that agent, alkali measure under field test (productions) district profit condition of living; Software should consider to show to live agent, alkali, polymer at underground absorption and relevant chemical change in the analog computation, and desired parameters also should still lack the current international data of The data with the data input of measuring under the oil field oil water condition.
In the method that system interfacial tension and ternary system are filled a prescription in the above-mentioned optimization ternary composite driving, the three-dimensional oil displacement experiment model that described physical analogy oil displacement experiment is selected for use, three-dimensional geological model geometric similarity with the analog computation employing: the model planar dimension is 32cm * 32cm, if the well pattern injector producer distance is Dm, the likelihood ratio of then actual oil reservoir and displacement of reservoir oil model is 70.7D: 32=2.21D: 1; Each substratum reaches and totally makes uniform thickness, and the substratum number of plies is three layers, and small thickness can reflect corresponding formation of seepage in oil reservoir in oil displacement process, if actual core intersection average out to Hm, described small thickness h I=15.09H/D (cm); Technical indicators such as described three-dimensional physical model degree of porosity, permeability meet design requirement, and the oil displacement experiment result meets the oil field development actual conditions substantially, for satisfy the requirement of experiment small thickness, permeability can be amplified in proportion.
The main experimental procedure of described physical analogy oil displacement experiment: be simulated oil A), take off vapour crude oil interpolation lightweight kerosene by well head and form that its viscosity is identical with underground crude oil by displacement oil; B) oil displacement experiment process: a, water drive moisture 98% o'clock water drive in the output liquid stops; B, injection ternary system slug; C, annotate follow-up polymer slug; D, annotate the clear water slug, moisturely in output liquid reach 98% o'clock oil displacement process once more and stop;
In the above-mentioned experimental procedure, fluid injection speed l=1.3337 * h * φ * D * V s(ml/h) wherein, h is the three-dimensional physical model effective thickness, and φ is the three-dimensional physical model degree of porosity, and D is on-the-spot oil reservoir injector producer distance, V sBe on-the-spot oil reservoir ternary system slug injection rate;
The oil displacement experiment effect is an evaluation index with the recovery ratio improvement value, recovery ratio improvement value=test final recovery percent of reserves-water drive recovery percent of reserves.
In the method that system interfacial tension and ternary system are filled a prescription in the above-mentioned optimization ternary composite driving, described oil displacement efficiency optimum value is meant the recovery ratio amplitude of raising: promptly well water was implemented ternary composite driving before being lower than 98%, go back up to 98% o'clock recovery percent of reserves again after descending with well water in the ternary composite driving process and be defined as the ternary composite driving recovery percent of reserves, it is the amplitude of adopting that increases of ternary composite driving with corresponding water drive scheme difference of recovery percent of reserves when the well water 98%.
The method for optimizing of ternary system prescription and system interfacial tension in the ternary composite driving provided by the invention, adopt following steps:
1) sets up three-dimensional geological model, form, drop into the oil displacement efficiency of the identical ternary system displacement of reservoir oil scheme of chemical agent total cost with the numerical simulation calculation variable concentrations, the research system change in concentration is to the rule that influences of oil displacement efficiency, improvement value with the final integral recovery ratio is an index, and the prescription of selected ternary system optimization of formulation district and recommendation is formed;
2) set up three-dimensional oil displacement experiment model, with physical analogy completing steps 1) oil displacement experiment formed of recommended formula, check recommended formula oil displacement efficiency;
3) will be through step 2) prescription of preliminary examination forms and inserts in the displacement of reservoir oil scheme of determining structure, and under its framework, appropriateness is adjusted prescription and is formed concentration and carry out oil displacement experiment, prescription is formed further optimized;
4) the polymer concentration adjustment in the ternary system slug in the scheme of the prescription that step 3) is optimized, make the attainable underground activities viscosity of system viscosity and oil reservoir identical, follow-up polymer slug concentration also adjusts accordingly, and adjusted displacement of reservoir oil prescription is carried out the oil displacement experiment examination.
5) on the three-dimensional geological model with numerical simulation calculation under the oil field oil water condition, oil displacement efficiency when the system interfacial tension changes is an index with the improvement value of final integral recovery ratio, obtains the optimization range of system interfacial tension;
6) based on the displacement of reservoir oil scheme of step 4) physical analogy oil displacement experiment, adjust in the displacement of reservoir oil prescription and show live agent, alkali concn in the ternary system, make the tangible relatively different formulations displacement of reservoir oil scheme of system interfacial tension difference and finish oil displacement experiment, the analysis and research oil displacement efficiency is determined: the optimization range that A) is adapted to the system interfacial tension of this ternary compound oil drive oil body system; B) be adapted to the system optimization prescription that this ternary compound oil drive oil body is.
7) according to the retention rate of on-the-spot system viscosity and the polymer molecular weight of selecting for use, set-up procedure 6) polymer concentration of optimization formula and follow-up polymer slug concentration, obtain the oil field oil displacement process and implement displacement of reservoir oil scheme, slug underground activities viscosity at different levels can be with 6 in this scheme implementation process) in oil displacement experiment slug viscosity at different levels close, guarantee the good oil displacement efficiency of oil displacement process.
The method of system interfacial tension and ternary system prescription can be selected highly basic for use in the described ternary system in aforesaid two kinds of optimization ternary composite drivings, also can select weak base for use.Yet for general low concentration table agent weak base alive system, and the interfacial tension between the crude oil all is difficult to reach 5 * 10 -3MN/m or lower, thus be difficult to find the lower limit of oil displacement system interfacial tension optimum range, so should not adopt weak base system preference oil displacement system interfacial tension; When selecting the displacement of reservoir oil of weak base system for use, can adopt the highly basic system to finish the preferred of system interfacial tension optimum range earlier, in the optimization range of system interfacial tension, prepare low concentration table agent weak base alive system formulation afterwards again, and prescription is examined or further optimization by oil displacement experiment.
Description of drawings
The geological model structural representation that Fig. 1 adopts for numerical simulation calculation among the present invention;
Fig. 2 dissects cross section place figure for the rock core of oil displacement experiment among the present invention;
Fig. 3 dissects section distribution of remaining oil figure for rock core behind the original formulation system oil displacement test;
Fig. 4 dissects section distribution of remaining oil figure for rock core behind the numerical simulation study recommended formula system oil displacement test of the present invention;
Fig. 5 dissects section distribution of remaining oil figure for rock core behind the optimization of C system ternary composite driving displacement of reservoir oil scheme oil displacement test of the present invention.
The specific embodiment
For opener, below from several respects narration the present invention.
The inventive method at first is to use this high-tech means of numerical simulation and the ternary composite driving oil tech is furtherd investigate the important achievement that obtains:
1. the condition of numerical simulation calculation
1) selection of application software
Numerical simulation study is selected the Facs software of introducing U.S. Greand company for use, and this software has main feature and the function that software that ternary composite driving numerical simulation set forth above requires should have, and quick calculation method is arranged, and realized through engineering approaches basically.
2) main calculating parameter determines
The analog computation parameter is another key factor of Calculation and Study, calculating parameter should be chosen according to the concrete condition in oil field, the present invention is research object under study for action with the Daqing oil field, selected for use Exploration Development Inst., Daqing Oil Field Co Ltd.'s recovery ratio two Room in conjunction with Daqing oil field recover the oil table that four factory's apricots, two trial zone oil displacement tests measure live interfacial tension figure between agent, aqueous slkali and the Daqing crude oil and polymer, alkaline concentration viscosity relationship curve, wherein table agent alive is U.S. product ORS, polymer is the Daqing oil field product, and alkali is NaOH.
In the analog computation software consideration table live agent, alkali, polymer at underground absorption and relevant chemical change, desired parameters, Daqing oil field have with the input of Daqing oil field numerical value, still lack the current international data of The data.
Three-dimensional geological model, Nx=Ny=9, the Nz=3 of simplifying shown in Figure 1 got in analog computation, under special circumstances, when getting Nx=9, Ny=Nz=1 one-dimensional model, when Nx=Ny=9, Nz=1 the two dimensional surface model, Nx=9, Ny=1 is two-dimensional section model during Nz=3.Two dimensional cross-section and three-dimensional geological model plane homogeneous, vertically go up heterogeneous body, corresponding different coefficient of permeability variation V kBeing worth corresponding layering permeability data is listed by table 1.Determine the required geology of analog computation, fluid related data with reference to Daqing oil field geology and characteristic of fluid.
The different V of table 1 kThe value oil reservoir is vertically gone up Permeability Distribution
????V k ????0 ????0.248 ??0.433 ??0.590 ??0.720 ??0.820 ??0.890 ??0.968
????K 1μm 2 ????0.442 ????0.0987 ??0.0987 ??0.0987 ??0.0987 ??0.0987 ??0.0987 ??0.0987
????K 2μm 2 ????0.442 ????0.1234 ??0.1579 ??0.2073 ??0.2961 ??0.4935 ??0.7403 ??1.974
????K 3μm 2 ????0.442 ????0.1974 ??0.3158 ??0.5182 ??0.8883 ??1.4085 ??2.2208 ??5.922
3) the oil displacement efficiency evaluation method determines
In the ordinary course of things, displacement of reservoir oil scheme is the scheme end condition with oil well comprehensive water cut 98% all in the analog computation research, improve the recovery ratio amplitude for the ternary composite driving scheme, in the ordinary course of things, it is the well water ternary composite driving that before 98%, (will be lower than 98% 1 segment distance strictly speaking), be defined as the ternary composite driving recovery percent of reserves to go back up to 98% o'clock recovery percent of reserves again after the well water decline in the ternary composite driving process, it is the amplitude of adopting that increases of ternary composite driving with corresponding water drive scheme difference of recovery percent of reserves when the well water 98%, promptly improves the recovery ratio amplitude.
2, several main achievements in research drawing of numerical simulation calculation:
1) to the new understanding of ternary composite driving displacement of reservoir oil feature: ternary composite driving has higher oil displacement efficiency, yet, Calculation and Study on threedimensional model shows, for non-homogeneous pay, in the plane along the main stream line direction, in the vertical along high permeability zone advance by leaps and bounds (called after " first kind " is advanced by leaps and bounds) more serious.So-called " advancing by leaps and bounds ", mean ternary composite driving after, in non-homogeneous pay, the less permeable layer position, still leave a large amount of residual oils at the both wings position of oil reservoir plane main stream line.
Referring to table 2, water drive of on the two dimensional surface model, calculating and ternary composite driving scheme result, wherein, the ternary system prescription: 0.3% surfactant+1.0% alkali+0.12% polymer, slug volume are 0.3VP.
Table 2 two dimensional surface model water drive, ternary composite driving remaining oil distribution (%)
Water 29.6 ?30.8 ?33.0 ?35.3 ?37.5 ?39.5 ?42.0 ?44.3 ?50.2
?31.9 ?33.7 ?35.7 ?37.7 ?39.6 ?42.0 ?44.3 ?50.2
?35.0 ?36.6 ?38.2 ?39.9 ?42.1 ?44.3 ?50.1
?37.7 ?39.0 ?40.3 ?42.2 ?44.2 ?50.0
Drive 39.9 ?40.8 ?42.3 ?44.0 ?49.7
?41.2 ?42.2 ?43.8 ?49.3
?42.4 ?43.3 ?48.5
?43.1 ?47.3
?46.2
Ternary composite driving 0.03 ?0.03 ?0.04 ?0.06 ?0.17 ?1.29 ?7.80 ?34.9 ?61.4
?0.04 ?0.05 ?0.07 ?0.18 ?1.10 ?6.14 ?32.6 ?60.8
?0.06 ?0.08 ?0.20 ?0.91 ?4.86 ?29.5 ?59.2
?0.13 ?0.25 ?0.74 ?3.90 ?25.4 ?57.6
?0.33 ?0.54 ?3.12 ?19.9 ?54.2
?0.50 ?1.93 ?14.0 ?49.3
?1.15 ?7.24 ?39.2
?3.87 ?21.3
?17.9
Annotate: remaining oil saturation is symmetry with the main stream line on the plane, so the omission of main stream line Lower Half data is as follows.
Result of calculation is seen from table: for water drive, on main stream line, the remaining oil saturation value is increased to 46.2% gradually by 29.6%, and to the both wings direction, the remaining oil saturation value also increases gradually, is 52.0% at its edge peak from main stream line; Under the ternary composite driving situation, remaining oil distribution variation characteristic and water drive are roughly the same on the plane, but the difference of its numerical value area of a room but differs widely, here be on the one hand, near main stream line, particularly contiguous injection end one side, in bigger areal extent, the remaining oil saturation value is lower than water drive remaining oil saturation value significantly, another aspect, at the edge that closes on oil well one side's both wings position, the remaining oil value reaches 60.8%, exceeds the corresponding point value of water drive unexpectedly more than 10.0%, this shows, ternary composite driving has enlarged the difference of main stream line and both wings position displacement of reservoir oil situation on the plane, near well and the main stream line both sides very high displacement effect arranged, and final displacement effect is low-down at the both wings position.
On the basis of The above results, continue at V KOn=0.59 three-dimensional non-homogeneous model, corresponding water drive and ternary composite driving displacement of reservoir oil scheme have been calculated.The water drive recovery percent of reserves is 46.47%, and the ternary composite driving recovery percent of reserves is 65.3%, and ternary composite driving improves recovery ratio 18.83% with respect to water drive.Table 3 is listed three interval remaining oil saturations distribution under the water drive situation, can see, changes in distribution situation two-dimensional case substantially roughly the same on the plane, three intervals difference to some extent in the vertical, bottom high permeability zone section, respective value is low than the middle part interval, and middle part interval respective value is low than the top interval relatively, and this has reflected the difference of positive rhythm rate oil reservoir different layers position recovery percent of reserves.Table 4 is listed the result of ternary composite driving, compare and see, remaining oil value changes in distribution on each aspect is two-dimensional case roughly the same, and in that up and down the difference between the interval is also more remarkable than water drive, at the oil well position, three layers of remaining oil value of upper, middle and lower are respectively 73.7%, 43.5%, 9.04%, its value of position, both wings corner is respectively 78.8%, 60.8%, 45.0%, numerical value clearly illustrates in the table, exist under the heterogeneous body condition at oil reservoir, ternary composite driving has high recovery percent of reserves on the one hand, on the other hand, and main stream line and both wings position on the oil reservoir plane, the difference that vertically goes up recovery percent of reserves between the height permeable interval all further enlarges.This result has disclosed the basic displacement of reservoir oil feature of ternary composite driving more all sidedly: ternary composite driving has high oil displacement efficiency, yet on non-homogeneous pay, along on the main stream line direction, advances by leaps and bounds more serious along the high permeability zone section in the vertical in the plane.
Table 3 threedimensional model water drive remaining oil distribution (%)
The upper strata ??32.0 ??34.0 ??37.2 ??40.5 ??43.7 ??47.0 ??50.2 ??53.6 ??64.1
??35.5 ??38.1 ??41.1 ??44.0 ??47.2 ??50.3 ??53.6 ??64.1
??40.1 ??42.4 ??44.9 ??47.7 ??50.4 ??53.6 ??64.0
??44.2 ??46.1 ??48.4 ??50.7 ??53.6 ??63.7
??47.4 ??49.1 ??50.9 ??53.5 ??63.2
??50.2 ??51.3 ??53.3 ??62.3
??51.7 ??52.9 ??61.1
??53.0 ??58.3
??57.7
The middle level ??29.2 ??31.3 ??33.7 ??36.2 ??38.7 ??41.2 ??44.0 ??46.9 ??55.3
??32.5 ??34.4 ??36.6 ??39.0 ??41.3 ??44.0 ??46.9 ??55.3
??35.9 ??37.7 ??39.7 ??41.7 ??44.1 ??46.9 ??55.2
??39.0 ??40.6 ??42.2 ??44.3 ??46.8 ??55.1
??41.7 ??42.9 ??44.5 ??46.7 ??54.8
??43.6 ??44.7 ??46.5 ??54.2
??45.0 ??46.1 ??53.3
??46.1 ??50.4
??50.5
Lower floor ??28.0 ??28.7 ??30.4 ??32.0 ??33.7 ??35.2 ??37.0 ??38.8 ??42.9
??29.6 ??30.9 ??32.3 ??33.8 ??35.3 ??37.0 ??38.7 ??42.8
??31.9 ??33.0 ??34.2 ??35.5 ??37.0 ??38.7 ??42.7
??33.8 ??34.7 ??35.7 ??37.0 ??38.6 ??42.6
??35.4 ??36.1 ??37.1 ??38.4 ??42.4
??36.4 ??37.0 ??38.2 ??42.0
??37.1 ??37.8 ??41.4
??37.6 ??40.1
??40.1
Table 4 threedimensional model ternary composite driving remaining oil distribution (%)
The upper strata 0.09 ?0.08 ?1.97 ?14.9 ?36.9 ?45.4 ?61.4 ?72.7 ?78.8
?0.29 ?5.31 ?23.1 ?38.8 ?47.0 ?61.0 ?72.7 ?78.8
?18.3 ?36.6 ?44.5 ?50.6 ?60.4 ?71.3 ?78.7
?44.7 ?50.2 ?53.8 ?58.8 ?69.8 ?78.6
?51.7 ?53.5 ?58.3 ?67.6 ?78.3
?54.3 ?58.4 ?65.7 ?77.5
?59.8 ?65.4 ?75.8
?66.3 ?71.5
?73.7
The middle level 0.04 ?0.04 ?0.07 ?0.43 ?2.42 ?10.2 ?30.4 ?41.0 ?60.8
?0.05 ?0.13 ?0.48 ?2.53 ?9.59 ?28.7 ?39.8 ?60.3
?0.40 ?0.94 ?2.93 ?9.90 ?27.5 ?38.0 ?59.3
?1.49 ?3.58 ?14.4 ?26.9 ?35.8 ?58.1
?6.35 ?20.5 ?27.4 ?33.8 ?56.3
?27.0 ?29.1 ?33.6 ?53.4
?28.3 ?31.0 ?50.3
?28.9 ?43.8
????43.5
Lower floor ????0.02 ????0.02 ????0.02 ????0.03 ????0.05 ????0.13 ????1.29 ????20.3 ????45.0
????0.02 ????0.03 ????0.04 ????0.05 ????0.12 ????0.92 ????15.6 ????44.0
????0.03 ????0.04 ????0.06 ????0.12 ????0.60 ????11.7 ????42.5
????0.05 ????0.07 ????0.13 ????0.50 ????7.94 ????39.8
????0.16 ????0.14 ????0.30 ????4.50 ????34.6
????0.10 ????0.20 ????2.53 ????28.3
????0.20 ????1.30 ????21.5
????1.17 ????12.4
????9.04
The mechanism of the displacement of reservoir oil feature of the ternary composite driving that above-mentioned analog study the discloses analysis interpretation of being not difficult, for two dimensional surface homogeneous model, the driving effect is better than the both wing portions position near main stream line also takes place under the water drive situation, promptly produce along the main stream line situation of advancing by leaps and bounds, when ternary composite driving, be injected with the higher relatively viscosity and the ternary system of displacement efficiency, close on well one side crude oil by a relatively large margin and be driven to the place ahead, wherein a part is by extraction, another part by displacement to the both wings position of closing on oil well one side, driven the position by ternary system, along with crude oil is driven away, water saturation raises significantly, and same here the existence drives liquid along the main stream line situation of advancing by leaps and bounds, the low interfacial tension system displacement of reservoir oil of high displacement efficiency, reduce residual oil saturation, make the phase permeability curve that the variation that water flows take place to help more, the raising of water phase permeability must make that viscous fingering worsens more, it is more serious to be that water is advanced by leaps and bounds, along with water breaks through to oil well, well water sharply raises, and the crude oil that is driven into oil well both wings position is trapped in the oil reservoir, thereby causes near the main stream line on the plane strengthening with the gap of both wings position oil saturation; Under the situation of three-dimensional, because there is the difference of permeability in interlayer, the difference that causes the displacing fluid sendout of each interval, the driving liquid of the big high displacement intensity of high permeability zone section quantity allotted, drive liquid advancing by leaps and bounds with further enlarging along high permeability zone, thereby further drive the difference of effect between enlargement layer, finally cause the expansion of layering recovery percent of reserves difference.
Based on above-mentioned new knowledge to ternary composite driving displacement of reservoir oil feature, the inventor recognizes:
A, ternary composite driving main research work should not be further to pursue higher oil displacement efficiency, and should be to suppress to advance by leaps and bounds on the suitable oil displacement efficiency basis keeping, and further enlarge and involve, and reach overall recovery ratio and further improve.
B, has only on the threedimensional model just displacement of reservoir oil situation in the simulated oil layer more truly of analog computation ternary composite oil-displacing scheme and oil displacement experiment, the displacement of reservoir oil feature that reflects ternary composite driving more all sidedly, so ternary composite driving analog computation and oil displacement experiment must carry out on threedimensional model.And a large amount of at present one dimension oil displacement experiments that adopt have just reflected oil displacement efficiency, the two-dimensional section model oil displacement experiment has also just been simulated driving situation in main stream line position between the injection-production well, thereby can not study the relatively poor relatively main stream line both wings position of recovery percent of reserves and drive situation, represent the oil displacement efficiency of oil reservoir with the two-dimensional section model oil displacement efficiency, must bring exaggerative to oil displacement efficiency.
In order to verify this situation, on one dimension, two dimensional cross-section, threedimensional model, calculated two prescription cases respectively, result of calculation is listed in table 5.
The ternary composite driving scheme oil displacement efficiency table of comparisons under table 5 different condition
The model dimension System is formed (%) ??Vp ??R ??％ ??Prs ??％ ??Ads ??％ ??Ws ??％
??Cs ??Ca ??Cp
One dimension ??0.3 ??1.0 ??0.12 ??1.690 ??91.40 ??46.86 ??0.18 ??52.96
??0.3 ??1.0 ??0.18 ??1.685 ??95.05 ??42.02 ??0.13 ??57.85
??0.3 ??1.0 ??0.21 ??1.686 ??95.74 ??41.78 ??0.13 ??58.09
Two dimensional cross-section ??0.3 ??1.0 ??0.12 ??1.732 ??66.38 ??72.62 ??0.15 ??27.23
??0.3 ??1.0 ??0.18 ??1.837 ??75.14 ??74.11 ??0.15 ??25.74
??0.3 ??1.0 ??0.21 ??1.853 ??79.13 ??72.95 ??0.16 ??26.89
Three-dimensional ??0.3 ??1.0 ??0.12 ??1.830 ??64.58 ??69.23 ??0.13 ??30.64
??0.3 ??1.0 ??0.18 ??1.484 ??65.19 ??45.89 ??13.52 ??68.55
??0.3 ??1.0 ??0.21 ??1.479 ??67.75 ??41.55 ??14.28 ??72.13
The concentration of surfactant, alkali, polymer in Cs, Ca, the Cp representative system respectively in the table, Vp, R be total fluid injection multiple, recovery percent of reserves when respectively representation scheme stops, Prs, Ads, Ws surfactant output when representation scheme stops respectively, adsorbance and at the percentage of aqueous phase hold-up.See that by data in the table under one dimension (homogeneous) condition, the recovery percent of reserves of ternary composite driving is very high, and natural core (one dimension) oil displacement efficiency in the experiment is relatively low, obvious is the factor affecting oil displacement efficiencies such as non-homogeneity of natural core; Here two-dimensional section model is identical with threedimensional model Vk value, corresponding scheme is compared, the two-dimensional section model oil displacement efficiency is evident as, shown two-dimensional section model exaggerating to oil displacement efficiency, then difference is more outstanding between two groups of corresponding scheme oil displacement efficiencies then reason in addition, will be hereinafter 3) in analysis.
2) the ternary system change in concentration influences the selection of new understanding of rule and optimization of C to oil displacement efficiency:
Desire to optimize the formula system of optimization, need set up a scientific formula and analyze comparative approach.Usually physical analogy is all adopted in preferred and is got the different system formulation solution of equal volume and carry out oil displacement experiment, and oil displacement efficiency optimization formula relatively can abbreviate as under " equal-volume solution " condition preferably.Anatomize and to see, although liquor capacity is identical, but because the chemical agent concentration difference that system is formed, chemical agent consumption difference then, and the unit price of chemical agent also is not quite similar, thereby make the total cost difference of the different compositional system chemical agents of equal-volume, the chemical agent cost difference that so different oil displacement experiments drop into, this shows that " equal-volume solution " oil displacement experiment do not set up common comparison basis, under such condition,, be difficult to obtain real optimization of C again with oil displacement efficiency index as a comparison.After this comparative approach shortcoming of understanding, used the comparative approach of " it is identical to drop into the chemical agent total cost " instead, can not require that its ternary system slug volume is identical than the displacement of reservoir oil scheme of prescription, but must guarantee that slug chemical agent cost is identical, the common comparable basis that identical like this input has been arranged increases with displacement of reservoir oil scheme and adopts the quality how much crude oil estimates prescription.Determine the comparative approach of " it is identical to drop into the chemical agent total cost ", must at first determine the cost of chemical agent.Understand according to investigations, homemade table agent purity alive is about 50%, unit price is 9000 yuan/t, agent is 18000 yuan/t but the table of apparent purity 100% is lived, Na0H is 2500 yuan/t, it is about 90% that Daqing oil field is produced polymer purity, and unit price is 20000 yuan/t, gets purity 100% polymer here and calculates by 25000 yuan/t.Based on current field use displacement of reservoir oil prescription, regulate the prescription composition and designed 18 prescriptions, the different formulations system is respectively got 0.3Vp chemistry agent cost, calculate their average again, this value is decided to be the cost that comparable scheme drops into chemical agent, be worth again the anti-corresponding displacement of reservoir oil scheme of the different formulations system ternary slug volume of obtaining with this, design displacement of reservoir oil scheme thus and carry out analog computation.At V kOn=0.59 the three-dimensional geological model, large quantities of displacement of reservoir oil schemes that adopted the method analog computation progressively optimized, table 6 has been listed last batch of displacement of reservoir oil computation schemes result and corresponding comparable water drive computation schemes result.1 ~ No. 33 scheme is arranged with computation sequence in the table.
The different ternary system oil displacement efficiency of table 6 table
Scheme System is formed Layering remaining oil (%) Final recovery percent of reserves (%) Increase the amplitude of adopting (%) Precedence
??Cs ??(％) ??Ca ??(％) ??Cp ??(％) The upper strata The middle level Lower floor
??0 Water drive ????50.20 ??44.07 ????36.62 ????46.47
??1 ??0.30 ??1.0 ??0.15 ????50.70 ??22.59 ????8.54 ????64.24 ??17.77 ??32
??2 ??0.30 ??1.0 ??0.12 ????50.62 ??21.70 ????6.81 ????67.73 ??21.26 ??31
??3 ??0.30 ??1.0 ??0.09 ????44.50 ??25.66 ????17.59 ????63.41 ??16.94 ??33
??4 ??0.25 ??0.8 ??0.24 ????41.21 ??21.85 ????12.26 ????69.48 ??23.03 ??30
??5 ??0.25 ??0.8 ??0.21 ????40.16 ??11.97 ????5.24 ????76.61 ??30.14 ??18
??6 ??0.25 ??0.8 ??0.18 ????42.48 ??13.21 ????5.45 ????75.07 ??28.60 ??22
??7 ??0.25 ??0.6 ??0.24 ????38.05 ??13.24 ????5.80 ????76.73 ??30.26 ??17
??8 ??0.25 ??0.6 ??0.21 ????38.81 ??13.62 ????5.88 ????76.23 ??29.76 ??20
??9 ??0.25 ??0.6 ??0.18 ????41.27 ??14.88 ????6.19 ????74.62 ??28.15 ??23
??10 ??0.20 ??0.8 ??0.24 ????39.83 ??20.29 ????11.07 ????71.17 ??24.70 ??28
??11 ??0.20 ??0.8 ??0.21 ????38.40 ??10.89 ????4.89 ????77.91 ??31.44 ??13
??12 ??0.20 ??0.8 ??0.18 ????40.65 ??11.94 ????5.07 ????76.49 ??30.02 ??19
??13 ??0.20 ??0.6 ??0.24 ????36.40 ??12.49 ????5.58 ????77.80 ??31.33 ??14
??14 ??0.20 ??0.6 ??0.21 ????37.31 ??12.06 ????5.26 ????77.73 ??31.26 ??15
??15 ??0.20 ??0.6 ??0.18 ????39.55 ??13.39 ????5.64 ????76.21 ??29.74 ??21
??16 ??0.15 ??0.8 ??0.24 ????38.08 ??19.24 ????10.69 ????72.46 ??25.99 ??25
??17 ??0.15 ??0.8 ??0.21 ????36.49 ??9.85 ????4.53 ????79.26 ??32.79 ??7
??18 ??0.15 ??0.8 ??0.18 ????38.50 ??10.83 ????4.71 ????77.97 ??31.50 ??12
??19 ??0.15 ??0.6 ??0.24 ????34.59 ??11.83 ????5.65 ????78.78 ??32.31 ??10
??20 ??0.15 ??0.6 ??0.21 ????35.37 ??11.22 ????5.14 ????78.91 ??32.44 ??9
??21 ??0.15 ??0.6 ??0.18 ????37.38 ??12.12 ????5.30 ????77.67 ??31.20 ??16
??22 ??0.15 ??1.0 ??0.21 ????38.32 ??22.11 ????12.63 ????70.24 ??23.77 ??29
??23 ??0.10 ??0.8 ??0.24 ????35.31 ??20.45 ????11.44 ????72.64 ??26.17 ??24
??24 ??0.10 ??0.8 ??0.21 ????34.98 ??9.38 ????4.40 ????80.12 ??33.65 ??3
??25 ??0.10 ??0.6 ??0.24 ????32.67 ??11.37 ????5.65 ????79.75 ??32.28 ??8
??26 ??0.10 ??0.6 ??0.21 ????33.41 ??10.69 ????5.10 ????79.95 ??33.48 ??5
??27 ??0.10 ??1.0 ??0.21 ????36.66 ??21.49 ????12.17 ????71.37 ??24.90 ??27
??28 ??0.08 ??1.0 ??0.21 ????36.20 ??20.68 ????11.80 ????72.19 ??25.72 ??26
??29 ??0.08 ??0.8 ??0.21 ????34.78 ??9.34 ????4.43 ????80.20 ??33.73 ??2
??30 ??0.08 ??0.6 ??0.21 ????33.38 ??10.73 ????5.16 ????79.91 ??33.41 ??6
??31 ??0.05 ??1.0 ??0.21 ??35.00 ??8.14 ??3.89 ??80.82 ??34.35 ??1
??32 ??0.05 ??0.8 ??0.21 ??34.93 ??9.71 ??4.47 ??79.98 ??33.51 ??4
??33 ??0.05 ??0.6 ??0.21 ??36.10 ??12.41 ??5.32 ??78.06 ??31.61 ??11
Method is preferably calculated owing to adopted scheme " it is identical to drop into the chemical agent total cost " here, so each scheme oil displacement efficiency is comparable.
Data in the serious analysis table are seen following situation: corresponding to table agent alive and the definite system of alkali concn, when polymer concentration changes from low to high, oil displacement efficiency progressively improves, change under a certain concentration, along with polymer concentration further improves, oil displacement efficiency descends on the contrary.In table 5, there is many prescriptions case to be such variation, as: scheme 1 ~ scheme 3, scheme 4 ~ scheme 6, scheme 10 ~ scheme 12, scheme 16 ~ scheme 18, scheme 19 ~ scheme 21.Here give special attention for a middle scheme in every prescription case, the concentration that claims polymer in its system is designated hereinafter simply as " the turnover concentration of polymerization-filling thing " for " the turnover concentration that the system oil displacement efficiency changes under correspondence table is lived agent and alkali concn ".Should illustrate, strictness should be that the system viscosity variation causes oil displacement efficiency to change in fact, so should claim that " the turnover viscosity that the system corresponding viscosity is system " is more accurate, only more directly perceived because of explaining with polymer concentration here, below still narrate with " the turnover concentration of polymerization-filling thing ".Again by seeing in the table, table agent alive is different with alkali concn in the system, the turnover concentration difference of the polymer of corresponding system, the above-mentioned first prescription case is transferred concentration accordingly about 1200mg/L, and corresponding turnover concentration of other each group can be inferred scheme 7 ~ scheme 9,15 liang of prescription cases of scheme 13 ~ scheme by data in the table all near 2100mg/L, the turnover concentration that also has corresponding polymers under correspondence table is lived agent and alkali concn system, its value are all near 2100mg/L or higher.See that by last analysis is clear the concentration of table agent alive and alkali is closely related in the turnover concentration of polymerization-filling thing and the system.The concentration of table agent alive and alkali is all relative higher in the corresponding system, and the turnover concentration of polymerization-filling thing is low relatively more; The concentration of table agent alive and alkali is all relatively low in the corresponding system, and the turnover concentration of polymerization-filling thing is high relatively more.For this Changing Pattern of more clear understanding, under different polymer concentrations, calculated two prescription cases, result of calculation is listed in table 7.
Corresponding data table when table 7 table is lived agent and alkali concn different two groups system displacement of reservoir oil scheme displacement of reservoir oil termination
??Cs ??Ca ??％ Project Polymerization-filling substrate concentration Cp (mg/L)
??900 ??1200 ??1500 ??1800 ??2100 ??2400 ??2700 ??3000
??0.3 ??1.0 ??Vp ??1.7827 ??1.8300 ??1.5195 ??1.4844 ??1.4791 ??1.4696 ??1.4677 ??1.4571
??R％ ??59.93 ??64.58 ??61.99 ??65.19 ??67.75 ??70.31 ??72.37 ??74.35
??Pr?t ??92.33 ??88.59 ??57.43 ??45.89 ??41.55 ??37.09 ??34.04 ??29.97
??Ad?t ??0.18 ??0.16 ??9.25 ??13.52 ??14.28 ??14.94 ??15.46 ??16.09
??Ws?t ??35.45 ??39.21 ??61.28 ??68.55 ??72.13 ??75.93 ??78.46 ??81.90
Layering remaining oil % On ??56.34 ??53.50 ??46.70 ??44.37 ??42.04 ??39.97 ??37.87 ??35.88
In ??31.72 ??25.23 ??28.99 ??24.46 ??22.27 ??19.85 ??18.10 ??16.46
Down ??10.24 ??8.15 ??17.49 ??16.20 ??14.48 ??12.78 ??11.61 ??10.43
??0.1 ??0.8 ??Vp ??1.7186 ??1.6985 ??1.6633 ??1.5920 ??1.5812 ??1.4779 ??1.4719 ??1.4573
??R％ ??59.14 ??63.20 ??67.49 ??70.79 ??73.67 ??70.20 ??72.56 ??74.03
??Pr％ ??28.70 ??26.40 ??23.53 ??20.07 ??18.26 ??13.34 ??12.73 ??11.37
??Ad％ ??0.059 ??0.062 ??0.056 ??0.058 ??0.062 ??3.82 ??2.60 ??2.75
??Ws％ ??13.90 ??16.19 ??19.07 ??22.53 ??24.33 ??25.49 ??27.32 ??28.53
Layering remaining oil % On ??55.59 ??53.26 ??49.69 ??46.34 ??42.45 ??38.46 ??37.19 ??35.33
In ??32.33 ??26.86 ??21.46 ??17.73 ??15.23 ??22.16 ??19.61 ??18.66
Down ??12.34 ??10.17 ??8.61 ??7.60 ??6.91 ??12.54 ??10.98 ??10.20
Data show in the table 7, two groups of tables live agent, alkali concn different formulations scheme " the turnover concentration of polymerization-filling thing " respectively 1200, near the 2100mg/L.
Obtain showing in the system to live agent, alkali and polymer concentration variation the rule that influences by data analysis in table 6, the table 7 to oil displacement efficiency:
A, for table live agent, the fixing system of alkali concn, along with polymer concentration in the system improves, oil displacement efficiency improves, and improves yet polymer concentration occurs under a certain definite concentration again, oil displacement efficiency decline situation promptly occurs " polymer conversion concentration ";
Live agent, alkali concn of table be higher relatively in B, the system, and " the polymer conversion concentration " of system correspondence is relatively low.
System is formed change in concentration influences rule to oil displacement efficiency understanding, for the oil displacement system prescription preferably provides alternative condition: only have under the higher turnover concentration situation in system, polymer concentration is got the system of closing on turnover concentration just can obtain good oil displacement efficiency.The inferior scheme in first six digits of row all is the formula system that meets this optimum condition in the table 6, obtains the optimization zone of oil displacement system thus:
i.Cs＝0.05~0.10％、Ca＝0.6~1.0％；
About ii.Cp=2100mg/L.
Here know and see that the prescription of optimization has tangible two characteristics:
A, low table live agent concentration and low alkali concn;
The polymer of B, suitable high concentration.
From conservative relatively angle, recommend from optimization of C that to adopt effectiveness ranking be that 6 scheme is the basic components that the optimization of C scheme is used as follow-up study to increase, its system formulation is formed and is:
C S＝0.1％???????C A＝0.8％????????C P＝2100mg/L
Its relative water drive increases adopts 33.44%, and its layering remaining oil value is respectively 34.98%, 9.38%, 4.4%.No. 2 schemes are with general formulation (or claiming original formulation) is close at present in the table 6, and its composition is:
C S＝0.3％???????C A＝1.0％????????C P＝1200mg/L
It is 21.26% that the relative water drive of this scheme improves recovery ratio, and its layering remaining oil value is respectively 50.62%, 21.70%, 6.81%, and as seen its top less permeable layer still has relatively large remaining oil.Two schemes are compared, recommended formula scheme recovery ratio value is higher than general formulation scheme 12.18%, and its layering remaining oil value reduces by 15.61%, 12.32%, 2.41% respectively than the general formulation scheme, demonstrates increasing substantially of less permeable layer position recovery percent of reserves in the middle and upper part.
3) inventor by to " under diagram of system is lived agent, alkali concn one stable condition; the further investigation that the polymerization-filling substrate concentration is in the significant difference between the different schemes oil displacement efficiency of turnover concentration both sides obtains the new knowledge to the ternary composite driving mechanism of oil displacement: because of there are two kinds of different driving situations in ternary composite driving, thereby cause two kinds of different oil displacement efficiencies:
The first kind drives situation: moderate pressure, and " normally " driving situation (having " first kind is advanced by leaps and bounds "), the displacement of reservoir oil cycle is longer relatively, the remaining oil value is low behind the ternary composite driving, oil displacement efficiency is good relatively, and the SURFACTANT ADSORPTION amount is low, and SURFACTANT ADSORPTION does not influence oil displacement efficiency.
Second class drives situation: the pressure height, the appearance water is advanced by leaps and bounds (called after " second class " is advanced by leaps and bounds) and expansion involves the coexistence situation, the displacement of reservoir oil cycle shortens relatively, the remaining oil value is high relatively behind the ternary composite driving, the oil displacement efficiency relative mistake, the SURFACTANT ADSORPTION amount is big, and the SURFACTANT ADSORPTION amount influences oil displacement efficiency.
Research simultaneously obtains, and factors such as the interfacial tension of the geometry of displacement of reservoir oil model (one dimension, two dimension, three-dimensional), system composition concentration, system, fluid injection speed all will exert an influence to the driving situation in the oil displacement process.Table 8 is listed surfactant concentration, alkali concn is identical, polymer concentration different formulations system analog computation oil displacement efficiency under different condition.
The ternary composite driving scheme oil displacement efficiency table of comparisons under table 8 different condition
The model dimension The scheme numbering System is formed (%) ??Vp ??R ??％ ??Prs ??％ ??Ads ??％ ??Ws ??％
??Cs ??Ca ??Cp
One dimension ????1 ??0.3 ??1.0 ??0.12 ??1.690 ??91.40 ??46.86 ??0.18 ??52.96
????2 ??0.3 ??1.0 ??0.18 ??1.685 ??95.05 ??42.02 ??0.13 ??57.85
????3 ??0.3 ??1.0 ??0.21 ??1.686 ??95.74 ??41.78 ??0.13 ??58.09
Two dimensional surface ????4 ??0.3 ??1.0 ??0.12 ??1.476 ??82.62 ??24.37 ??0.17 ??75.80
????5 ??0.3 ??1.0 ??0.18 ??1.456 ??87.11 ??16.96 ??0.17 ??82.87
????6 ??0.3 ??1.0 ??0.21 ??1.360 ??76.53 ??10.39 ??7.45 ??82.16
Three-dimensional ????7 ??0.3 ??1.0 ??0.12 ??1.830 ??64.58 ??69.23 ??0.13 ??30.64
????8 ??0.3 ??1.0 ??0.15 ??1.560 ??61.99 ??44.88 ??7.23 ??47.89
????9 ??0.3 ??1.0 ??0.18 ??1.484 ??65.19 ??45.89 ??13.52 ??68.55
????10 ??0.3 ??1.0 ??0.21 ??1.479 ??67.75 ??32.47 ??11.16 ??56.37
????11 ??0.1 ??0.8 ??0.12 ??1.699 ??63.20 ??61.90 ??0.15 ??37.95
????12 ??0.1 ??0.8 ??0.18 ??1.592 ??70.79 ??47.05 ??0.13 ??52.82
????13 ??0.1 ??0.8 ??0.21 ??1.581 ??73.67 ??42.81 ??0.15 ??57.04
????14 ??0.1 ??0.8 ??0.24 ??1.478 ??70.20 ??31.28 ??8.96 ??59.76
Annotate: threedimensional model is a plane homogeneous vertical heterogeneity model.
The obvious characteristic that is in " first kind " driving situation scheme in the table is that its table agent adsorbance alive percentage Ads value is very little, below 1%, can judge that with this scheme 6,8,9,10,14 drives the situation scheme for " second class " in table, other is that " first kind " drives the situation scheme.Belong to two dimensional surface model displacement of reservoir oil scheme 4,5,6 together, surfactant in the system, alkali concn are identical, and polymer concentration is higher than scheme 4,5 in scheme 6 systems, and the displacement of reservoir oil is the result compare, and scheme 6 fluid injection multiples are few, and the SURFACTANT ADSORPTION amount is big, and recovery percent of reserves is minimum; Belong to threedimensional model scheme 7,8 together, surfactant in the system, alkali concn are identical, and polymer concentration is higher than scheme 7 in scheme 8 systems, and the displacement of reservoir oil is the result compare, and scheme 8 fluid injection multiples are few, and the SURFACTANT ADSORPTION amount is big, and recovery percent of reserves is low; Belong to threedimensional model displacement of reservoir oil scheme 10,12,13 together, polymer concentration is identical in scheme 10,13 systems, polymer concentration is low in scheme 12 systems, surfactant concentration, alkali concn all are low relatively in scheme 12,13 systems, and especially surfactant concentrations is 1/3rd of a scheme 10 only, and the result sees from the displacement of reservoir oil, the 10 fluid injection times of scheme are the shortest, the SURFACTANT ADSORPTION amount is very big, and it is nearly 6% that recovery percent of reserves not only is lower than scheme 13, and be lower than scheme 12 about 3%.
Owing to be familiar with " having two kinds of different driving situations in the oil displacement process ", not only found system to form change in concentration oil displacement efficiency has been influenced the immanent cause that turning variation takes place for oil displacement efficiency in the rule, and from " the geometric shape difference of research model; the system that same concentration is formed can be in the different driving state ", further recognize the necessity of on threedimensional model, ternary composite driving being studied, back two schemes of calculating on the two-dimensional section model in the preceding table 5 are to be in " first kind " driving situation, and two schemes are to be in " second class " driving situation under three-dimensional condition, and this reason has further been exaggerated two-dimensional section model corresponding scheme oil displacement efficiency just.
4) inventor has further studied the influence rule of system interfacial tension variation to oil displacement efficiency.At V k=0.59, oil reservoir vertical permeability K zWith horizontal permeability K xRatio K z/ K xOn=0.1 the non-homogeneous model, get recommended formula system: C S=0.1%, C A=0.8%, C P=2100mg/l, the slug volume is got 0.3V pIn order to open of the influence of rank difference in clearer reflection system interface to oil displacement efficiency, after to system interfacial tension map analysis research, improvement and design goes out this typical interfacial tension system: in table was lived agent, the effective working concentration scope of alkali, the interfacial tension of each scheme was respectively 5 * 10 -1, 1 * 10 -1, 5 * 10 -2, 1 * 10 -2, 5 * 10 -3, 1 * 10 -3, 5 * 10 -4, 1 * 10 -4MN/m, corresponding these the eight kinds special tables agent System Design displacement of reservoir oil alive schemes are calculated, and table 9 is listed the result of calculation of each scheme.
The different interfacial tension displacement of reservoir oil of table 9 computation schemes result
Figure A0310088700201
Scheme in the analytical table can be seen, along with the progressively reduction of system interfacial tension, the recovery percent of reserves R of scheme progressively improves, however in the system interfacial tension by 5 * 10 -3N/m changes to 1 * 10 -3During mN/m, recovery percent of reserves R drops to 67.12% by 72.53%, and turning variation has taken place, and correspondence analysis table agent adsorbance alive percentage Ads variation sees that the system interfacial tension is higher than 1 * 10 -3Each scheme of mN/m, table are lived agent adsorbance percentage Ads all below 1%, and the system interfacial tension is lower than 5 * 10 -3Each scheme of mN/m, table are lived agent adsorbance percentage Ads all about 12%, as seen just in the system interfacial tension by 5 * 10 -3MN/m changes to 1 * 10 -3During mN/m, the conversion of the situation that drives having taken place in the oil displacement process, has been converted into " second class " driving situation by " first kind " driving situation.
Obtaining the system interfacial tension by this result of study changes and to influence rule to what oil displacement efficiency changed: along with the progressively reduction of system interfacial tension, the recovery percent of reserves R of scheme progressively improves, about the system interfacial tension by 5 * 10 -3MN/m changes to 1 * 10 -3During mN/m, the turning variation of unexpected decline has taken place in recovery percent of reserves R, and the immanent cause that this variation takes place is the variation that drives situation in the oil displacement process.
According to scheme oil displacement efficiency in the table 9, the interfacial tension of system can be divided into substantially three regional extents:
A, high value poor efficiency district: the interfacial tension σ of system＞1 * 10 -1The mN/m scope;
B, surface tension optimization district: the interfacial tension scope of system is about 1 * 10 -1MN/m≤σ≤5 * 10 -3MN/m;
C, low value poor efficiency district: the interfacial tension σ of system＜5 * 10 -3The mN/m scope.
3, the examination correction of physical analogy oil displacement experiment logarithm value analog result
The inventive method, adopt the result of physical analogy oil displacement experiment logarithm value analog study to examine and further in-depth exploration:
1) oil displacement experiment model
The geological model geometric similarity of simplifying is adopted in threedimensional model that the physical analogy oil displacement experiment is selected for use and analog computation: planar dimension is generally 32cm * 32cm, if the well pattern injector producer distance is Dm, the likelihood ratio of then actual oil reservoir and experimental model is 70.7D: 32=2.21D: 1; Get three layers and wait thick structure, if actual core intersection average out to Hm presses then experimental model thickness h=45.26H/D (cm) of the likelihood ratio, the small thickness h that calculates thus I=15.09H/D (cm).The layering permeability adopts the geological model of simplifying identical with analog computation, can the extremely low interlayer of permeability be set according to the oil reservoir situation between substratum.If small thickness is crossed thin or the substratum permeability is low excessively, do not satisfy model manufacturing and requirement of experiment, can amplify small thickness or substratum permeability this moment by being listed as suitably on year-on-year basis.
The oil displacement experiment result meets the oil field development actual conditions substantially, as: be the rock core of Daqing oil field oil displacement experiment development coefficient of heterogeneity Vk=0.59, recovery ratio should be about 48% when water drive stops (output liquid moisture 98%), and error is ± 2%.
Rock core for comparable oil displacement experiment requires more strict: rock core saturated water amount, saturated oil mass error amount are less than 10 ~ 20ml, and waterflood recovery efficiency factor minimax difference is less than 2%.
2) oil displacement experiment requirement
Oil displacement experiment on special-purpose experimental facilities by the Specialty Experiment technician routinely oil displacement experiment require to finish.Specific (special) requirements is described as follows:
A. consider that the crude oil that well head obtains is bigger with underground crude oil difference because of the degassing, being advisable with simulated oil of experiment usefulness by displacement oil, simulated oil is to get well head to take off vapour crude oil and add lightweight kerosene, makes its viscosity identical with beneath crude oil.
B. the saturated difficulty relatively of threedimensional model crude oil, should accomplish saturated evenly, particularly four corners position should saturated putting in place.
C, oil displacement experiment process: a, water drive moisture 98% o'clock water drive in the output liquid stops; B, notes ternary system slug; C, the follow-up polymer slug of notes or slug combination (only in relevant displacement of reservoir oil scheme oil displacement experiment, being provided with); D, annotate the clear water slug, moisturely in output liquid reach 98% o'clock oil displacement process once more and stop.
D, fluid injection speed are important technology data, obtain injector producer distance size and fluid injection speed all will influence oil displacement efficiency by research, aspect two, studying on the important understanding of the acquisition basis, find more satisfactory fluid injection speed to calculate relation formula and relevant parameter by numerical simulation calculation and physical simulation experiment examination.
D-1 research obtains: because the advancing by leaps and bounds property that occurs in the ternary composite driving process, oil displacement efficiency and injector producer distance are closely related, and under the fluid injection speed of correspondence, well spacing is dwindled oil displacement efficiency and reduced.The oil displacement experiment that carries out on little experimental model is that reservoir model is dwindled at high proportion, and natural vast scale reduces oil displacement efficiency.
D-2 research obtains: ternary composite oil-displacing effect and fluid injection speed are closely related, under the constant situation of maintenance injector producer distance, improve fluid injection speed by a relatively large margin and will improve oil displacement efficiency by a relatively large margin.Oil displacement experiment oil displacement process on mini Mod, annotating the speed of adopting in the experiment must be exaggerative to on-the-spot fluid injection speed, correspondingly brings increasing substantially of oil displacement efficiency.
Above two of D-3 exists in the oil displacement experiment of laboratory simultaneously, two kinds of effects of " front ", " negative " are cancelled each other, to dwindle oil displacement experiment and on-the-spot oil displacement efficiency difference, particularly, will make experiment effect more near actual oil displacement efficiency finding proper fluid injection speed amplifying parameters design fluid injection speed.
D-4 recommendation ternary system and follow-up slug injection rate computational methods are as follows:
On-the-spot oil reservoir data: injector producer distance is Dm, and effectively core intersection is Hm, and the oil reservoir degree of porosity is φ Ground, ternary slug injection rate is V SV P/ y can calculate section in the model (by the model square-shaped planar mid point section vertical with main stream line) and go up the average fltting speed of fluid and be:
V Ground=(D 2* H * Ф Ground* V S)/(2 * D * H * Ф Ground)/365
＝0.137×D×V S(cm/d)
The experimental model data: model length of side d=32cm, effective thickness h cm, degree of porosity are φ, and fluid injection speed is lml/h, and the section upper reaches average fltting speed of body is in the experimental model:
V Real=(1 * 24)/(1.414 * d * h * φ)=0.53 * 1/h/ φ (cm/d)
Get by analog computation and experimental study:
V Real/ V Ground=(0.53 * l/h/ φ)/(0.137 * D * V S)=5.16
Push away by following formula: l=(0.137 * D * V S) * 5.16/ (0.53/h/ φ)
＝1.3337×h×φ×D×V S(ml/h)
This fluid injection speed mainly is suitable for ternary system slug and follow-up polymer slug, clear water slug.For early stage water drive can adopt this fluid injection speed, but since water drive to reach moisture 98% oil displacement process of output liquid longer, water drive fluid injection speed is less to the oil displacement efficiency influence again, under the very long situation of water drive process, can suitably strengthen fluid injection speed.Special declaration, ternary composite driving displacement of reservoir oil scheme is not established preposition polymer slug among the present invention, and this fluid injection speed is not suitable for the polymer slug that is provided with before the ternary system slug.
3) the ternary system prescription is preferably preferably finished by following experiment with the system interfacial tension:
A, the prescription of being recommended by numerical simulation study is examined by oil displacement experiment.The desirable optimization of C that obtains by other channel of contrast experiment, experiment is the technology and the economic effect of the displacement of reservoir oil relatively.
B, consider that the prescription that numerical simulation study recommends is conservative relatively, be necessary in conjunction with oil displacement experiment further preferred, consider that again prescription is not independent use in process of the test, but use in the ternary slug in the displacement of reservoir oil scheme, the slug combination also can exert an influence to formulation optimization in the scheme, so the prescription optimization experiment here is to finish on the displacement of reservoir oil scheme basis after the optimization.For check low concentration formula system displacement of reservoir oil scheme oil displacement efficiency, formulate a contrast oil displacement experiment simultaneously with reference to Site Test Scheme.
C, consider that the concentration of polymer is higher relatively in the recommended formula, the formula system viscosity that preferably obtains through the preceding step still can be higher relatively on this basis, here system viscosity should be suitable with the underground activities viscosity of on-the-spot oil displacement system, the underground activities viscosity of system equals the injection viscosity of system and viscosity retention ratio is long-pending, and viscosity retention ratio generally all is lower than 50%, as seen, must need extra high injection viscosity for higher system underground activities viscosity, inevitable corresponding again thus too high injection pressure, everything all is very difficult at the scene.System viscosity must be dropped to on-the-spot attainable underground activities viscosity thus, should redefine polymer concentration in the system according to this, obtain corresponding prescription, also should insert in the displacement of reservoir oil scheme, and check oil displacement efficiency by oil displacement experiment to this prescription.
D, based on prescription through the preceding article experimental evaluation, live agent, alkali concn of table in the adjustment system, the different composition of preparation concentration formulas, the interfacial tension of its system is the highest can be 5 * 10 -1Near the mN/m, minimum can be 1 * 10 -3Near the mN/m, interfacial tension can differ from 0.5 order of magnitude between two adjacent prescriptions, and the prescription interfacial tension is low more, and the interfacial tension difference can be corresponding little between adjacent prescription, suitably adjust polymer concentration in each formula system again, make its viscosity be same as preceding article displacement of reservoir oil scheme ternary system viscosity.These prescriptions are inserted in the displacement of reservoir oil scheme, on the very strong model of comparativity, finish oil displacement experiment, can obtain the optimization range and the optimization of C of system interfacial tension thus.
E, according to the retention rate of on-the-spot system viscosity and the polymer molecular weight of selecting for use, adjust that polymer concentration obtains can considering to be directly used in on-the-spot prescription in the preceding article optimization formula.
4, oil displacement experiment example
Under Daqing oil field profit condition, finish 3) in require each group experiment, optimize the optimization range and the corresponding optimization of C of system interfacial tension, finish a collection of assistant experiment simultaneously, checking preamble relevant discussion.
Experiment condition: physical simulation experiment carries out on plane homogeneous, the three-dimensional manikin of vertical heterogeneous body.The physical model physical dimension is 32 * 32 * 3.6cm, it similar in appearance to injector producer distance 250m Five-point method pattern well group area 1/4th, thickness is the 20m oil reservoir, model is divided into three layers of uniform thickness, three layers horizontal permeability is respectively 0.2 μ m 2, 0.6 μ m 2With 1.2 μ m 2, the coefficient of permeability variation V of model kValue is about 0.59.For special research needs special two-dimensional section model, physical dimension is 32 * 6 * 3.6cm, and other parameter is identical with threedimensional model.
Experiment get Daqing oil field recover the oil that four factories and a factory are on-the-spot please water and sewage, it is mixed in proportion to get degassed crude and kerosene
Close the simulated oil that forms, simulated oil viscosity under the reservoir temperature condition is 9.7mpa s.
The surfactant that uses in the experiment has two kinds, and one is U.S. product ORS (Daqing oil field academy provides), and another is homemade DQQ1 (Dalian University of Technology provides), is pilot product; The polymer that uses has two kinds, and one is that water treatment plant, Chaoyang, Beijing produces, relative molecular mass 1,800 ten thousand, and another is produced for the grand celebration auxiliary reagent factory, and relative molecular mass 1,400 ten thousand, used alkali are NaOH.
Oil displacement experiment carries out in high pressure constant temperature displacement of reservoir oil device.
1) the preferred and preferred oil displacement experiment of system interfacial tension of prescription
A, physical analogy examination oil displacement experiment
For the checking numerical simulation study obtain to the new understanding of ternary composite driving displacement of reservoir oil feature, be checking two-dimensional section model experiment exaggerating to oil displacement efficiency, low concentration table agent alive for the recommendation of checking numerical simulation study, the good oil displacement efficiency of alkali formula system, respectively in two-dimensional section model, on the three-dimensional experiment model, under Daqing oil field recovers the oil four factory's profit conditions, finish two groups of totally six experiments, the experiment here is only in order to compare equal volume ternary slug oil displacement efficiency, each displacement of reservoir oil scheme only contains 0.3Vp ternary system slug, tests other key data, the results are shown in table 10.Table middle and high concentration prescription is to formulate with reference to the prescription of certain field trial ternary composite driving testing program principal piece plug, and it has improved polymer concentration again on original formulation system basis, and copies in the on-the-spot system polymer to get the grand celebration product, and molecular mass is 1,400 ten thousand.Get Beijing and produce polymer, molecular mass 1,800 ten thousand another assembly side
Table 10 different table agent ternary system alive displacement of reservoir oil prescription physics imitation oil displacement experiment effect table
The model dimension Experiment numbers Table agent alive Prescription Waterflood recovery efficiency factor (%) Ternary is driven minimum moisture (%) in the process Ternary is driven ultimate recovery (%) Recovery ratio improvement value (%)
????C A(％) ????C S(％) ??C P??(mg/l)
Two dimensional cross-section ??1 ??ORS ????1.2 ????0.3 ??2300 ????49.6 ??36.5 ????68.1 ????18.4
??2 ??ORS ????0.8 ????0.1 ??2100 ????47.9 ??24.2 ????70.4 ????22.5
??3 ??DQQ1 ????0.8 ????0.1 ??2100 ????45.5 ??33.3 ????68.1 ????22.6
Three-dimensional ??1 ??ORS ????1.2 ????0.3 ??2300 ????49.1 ??66.0 ????62.7 ????13.6
??2 ??ORS ????0?8 ????0.1 ??2100 ????46.2 ??24.0 ????67.9 ????21.7
??3 ??DQQ1 ????0.8 ????0.1 ??2100 ????47.5 ??62.1 ????66.2 ????18.7
Fig. 2 draws experiment back rock core slice location figure, and rock core dissectd the section photo after Fig. 3 provided dimensional model experiment 1 and test, sees that therefrom ternary drives that afterwards oil reservoir remaining oil distribution and numerical simulation calculation result are coincide.
Comparative analysis two-dimensional section model, the corresponding scheme result of threedimensional model know and see that the two dimensional model oil displacement efficiency is obviously bigger than normal.
Comparative analysis threedimensional model variable concentrations formula system oil displacement efficiency is obviously seen, the displacement of reservoir oil of agent low concentration system all has very high recovery rate improvement value no matter homemade or import table is lived.Fig. 4 provides dimensional model experiment 2 and has tested the back rock core and dissect the section photo, comparison diagram 3 is clear see the low concentration formula system oil displacement experiment of recommendation after remaining oil obviously reduce.
The result of this group oil displacement experiment logarithm value analog study as a result gives to confirm, thereby lays the first stone for following experiment.
B, on " displacement of reservoir oil scheme " basis of determining, carry out the preferred and contrast displacement of reservoir oil scheme oil displacement experiment of formulation optimization experiment
Get the basic oil displacement experiment of grand celebration trial zone design scheme data, be numbered experiment 0 as contrast.
For making the more approaching reality of this scheme, get in the experiment import table of selecting for use in test agent ORS alive, get grand celebration and produce molecular weight 14,000,000 polymer.The experiment master data is as follows:
Preposition slug: volume is 0.0375Vp, Cp=1500mg/L, and the clear water preparation, viscosity is 41.5mPas.
Ternary principal piece plug: volume is 0.35Vp, CS=0.3%, C A=1.2%, CP=2300mg/L, the system interfacial tension is 4.55 * 10 -3MN/m, viscosity is 47.1mPas;
Ternary is paid slug: 0.1Vp, CS=0.1%, C A=1.2%, CP=1800mg/L, the system interfacial tension is 5.93 * 10 -3MN/m, viscosity is 39.0mPas;
Follow-up polymer slug 1: volume is 0.05Vp, Cp=1500mg/L, and the sewage preparation, viscosity is 41.5mPas;
Follow-up polymer slug 2: volume is 0.1Vp, Cp=700mg/L, and the sewage preparation, viscosity is 10.6mPas;
Follow-up polymer slug 3: volume is 0.05Vp, Cp=500mg/L, and the sewage preparation, viscosity is 7.8mPas.
The structure of the displacement of reservoir oil scheme of determining through optimization is:
0.3Vp ternary slug+0.2Vp sewage prepared polymer slug 1+0.3Vp clear water prepared polymer slug 2
With this " displacement of reservoir oil scheme " structure is framework, on the recommended formula basis of prosthomere experimental evaluation, respective concentration is done suitable adjustment obtain different formulations and be presented in " displacement of reservoir oil scheme ", the viscosity of ternary slug and follow-up two-stage polymer slug is slightly to reduce and changes.Organize four displacement of reservoir oil schemes altogether, scheme 1 ~ scheme 4 is listed cubic case ternary slug and follow-up polymer slug corresponding data respectively in the table 11.
The composition and the relevant parameter of the preferred displacement of reservoir oil scheme of table 11 prescription
The scheme numbering The ternary slug Polymer slug 1 Polymer slug 2
System is formed (%) Interfacial tension 10 -2????mN/m System viscosity mpa s Slug volume Vp ??Cp ??％ Viscosity mpa s Volume Vp ??Cp ??％ Viscosity mpa s Volume Vp
????Cs ??Ca ????Cp
??1 ????0.10 ??0.80 ????0.21 ????2.43 ????48.9 ??0.30 ??0.15 ??44.3 ??0.20 ??0.10 ??36.1 ??0.30
??2 ????0.08 ??0.50 ????0.18 ????0.67 ????41.0 ??0.30 ??0.14 ??42.3 ??0.20 ??0.10 ??36.1 ??0.30
??3 ????0.05 ??0.50 ????0.18 ????7.06 ????41.0 ??0.30 ??0.14 ??42.3 ??0.20 ??0.10 ??36.1 ??0.30
??4 ????0.05 ??0.30 ????0.18 ????8.00 ????41.0 ??0.30 ??0.14 ??42.3 ??0.20 ??0.10 ??36.1 ??0.30
??5 ????0.08 ??0.50 ????0.12 ????1.40 ????18.7 ??0.30 ??0.09 ??18.3 ??0.20 ??0.08 ??21.9 ??0.30
Five oil displacement experiment experimental results and chemical agent consumption are listed respectively by table 12, table 13.
Table 12 six oil displacement experiment results
Experiment numbers Waterflood recovery efficiency factor (%) In the ternary composite driving process minimum moisture (%) Scheme stops moisture (%) Ultimate recovery (%) Recovery ratio improvement value (%)
??0 ??53.2 ??71.9 ??98.1 ????72.5 ????19.3
??1 ??46.7 ??16.5 ??98.4 ????74.8 ????28.1
??2 ??44.6 ??6.9 ??98.2 ????74.6 ????30.0
??3 ??45.7 ??16.4 ??98.5 ????71.3 ????25.6
??4 ??44.2 ??36.1 ??98.6 ????67.4 ????23.2
??5 ??45.7 ??23.4 ??98.4 ????71.1 ????25.4
Table 13 six experimental chemistry agent consumption unit: mg/LVp
The chemical agent price is done following hypothesis: polymer is 20000 yuan/t, 2000 yuan/t of alkali, and import price is not considered in table agent alive, all calculates with 20000 yuan/t of homemade valency, can calculate the comparable table 14 that the results are shown in of experiment economic technology thus.
Table 14 six experiment economical and technical benefit contrast tables
Figure A0310088700262
By result in the table as seen, experiment 1 ~ 4 all has than No. 0 higher recovery ratio improvement value of experiment, and the expense of chemical agent reduces significantly.Wherein to test 2 best results, the recovery ratio improvement value reaches 30%, and the chemical agent expense reduces nearly 50%.Consist of further optimization of C with this scheme prescription thus.
Fig. 5 has tested back rock core cutting plane remaining oil distribution figure for experiment 2, and visible remaining oil value is low-down.
C, experimental formula examination under " underground activities viscosity " condition
It is reported, acceptable injection viscosity can not be higher than 40mPas under conditions of Daqing, and viscosity retention ratio is not higher than 50%, can decide system underground activities viscosity thus about 18mPas, condition combines with table 11 scheme 2 in view of the above, the displacement of reservoir oil scheme that design makes new advances, the scheme corresponding data is listed by table 11 scheme 5 hurdles, experimental result and other parameter provide in scheme 5 hurdles of table 12 ~ table 14, by seeing in the table 14, displacement of reservoir oil scheme improves recovery ratio 25.4% under the underground activities viscosities, and more comparable No. 0 scheme improves about 6%, and that the chemical agent expense reduces is about 60%, as seen has and good technical effect and economic benefit.It is bigger that this scheme is applied possibility.
D, oil displacement system interfacial tension are optimized and system formulation final optimization pass
With scheme in the table 11 5 is table agent alive, alkali concn in the basic adjustment system, form and have different interfacial tension displacement of reservoir oil schemes, ternary system slug composition is got listed data in the table 15, the oilfield sewage preparation, the system interfacial tension is measured under well head degassed crude and simulated oil condition respectively, and system interfacial tension value and viscosity number are listed in the table.Sewage prepared polymer slug polymer concentration is 0.09%, and viscosity is about 20mPas, and clear water prepared polymer slug polymer concentration is 0.055%, and viscosity is also about 20mPas.
Experimental result is listed by table 15.See in the table that four experiments have good comparativity, difference is 1.8% to the maximum between the waterflood recovery efficiency factor.Four experiment ternary system interfacial tensions reduce successively.See that from experiment recovery ratio improvement value No. 1 the experimental system interfacial tension is 1.71 10 -1MN/m, oil displacement efficiency are relatively poor relatively, and No. 2 the experimental system interfacial tension is 5.25 10 -2MN/m, oil displacement efficiency are best relatively, and No. 3 the experimental system interfacial tension is 6.20 10 -3MN/m, oil displacement efficiency are better relatively, and be slightly poorer than No. 2 scheme effects, and No. 4 the experimental system interfacial tension is 1.90 10 -3The moisture rapid rising situation of output liquid appears in mN/m in the oil displacement process, the more last experiment of oil displacement efficiency reduces significantly.
The different interfacial tension ternary system of table 15 oil displacement experiment oil displacement efficiency table
Experiment numbers Ternary system is formed The ternary system parameter The scheme water drive is gathered and is filled in % Scheme recovery ratio improvement value %
Table agent concentration % alive Alkali concn % Polymer concentration % Interfacial tension 10 -2mN/m System viscosity mPas
Degassed crude Simulation of Crude Oil
??1 ??0.08 ??0.20 ??0.11 ??17.09 ??2.21 ??21.7 ??48.3 ??18.4
??2 ??0.08 ??0.4 ??0.12 ??5.25 ??0.34 ??21.1 ??48.4 ??25.1
??3 ??0.08 ??0.5 ??0.12 ??0.62 ??0.31 ??19.5 ??49.9 ??24.3
??4 ??0.11 ??0.7 ??0.13 ??0.19 ??0.22 ??19.3 ??48.1 ??15.5
Obtain by experimental result:
1. the optimization range of system interfacial tension is: 1 * 10 -1~ 5 * 10 -3MN/m.
2. formula system is formed: table agent concentration 0.08% alive, alkali (NaOH) concentration 0.4 ~ 0.5%, polymer concentration 0.12%.
E, inject the viscosity retention ratio parameter of oil reservoir according to the chemical agent slug, calculate the injection viscosity of each slug of optimization displacement of reservoir oil scheme that the D item obtains, the sticking dense relation curve of corresponding polymer is decided in test factually again, find corresponding to the polymer implantation concentration that injects each slug under the viscosity, obtain the practical formulation of displacement of reservoir oil scheme ternary slug of oil displacement test (or production) and the concentration of follow-up polymer slug thus.
2) comparative experiments of the displacement of reservoir oil scheme oil displacement efficiency of optimization of C under, different table agent alive, the different plant areas in the oil field condition
Wish that for optimization of C it has compliance widely in the oil field, and wish that agent alive can both adapt to for multiple homemade table for it, and its oil displacement efficiency and import table agent system alive is suitable, on the identical displacement of reservoir oil model of preceding experiment, get factory's profit, get in grand celebration production and the table of preparing to produce agent and the import table agent ORS that lives that lives, get scheme 6 same approach design in the table 11 in grand celebration, finish the experiment of 4 wheel driven oil, experimental result sees Table 16.
Table 16 different table agent oil displacement system alive displacement of reservoir oil scheme oil displacement efficiency table
Experiment Table agent alive System parameter Slug viscosity Water drive recovery percent of reserves % Ternary is driven data
Interfacial tension 10 -2??mN/m Viscosity mPa.s Poly-1 mPa.s Poly-2 mPa.s Minimum moisture % Recovery percent of reserves % Increase and adopt amplitude %
??1 The U.S. ??4.25 ??21.4 ??18.7 ??20.6 ??50.0 ??48.0 ??74.8 ??24.8
??2 Grand celebration ??4.98 ??20.7 ??18.0 ??20.6 ??49.4 ??39.0 ??74.1 ??24.7
??3 Beijing ??1.41 ??20.5 ??17.8 ??20.5 ??48.7 ??44.0 ??76.4 ??27.7
??4 Dalian ??0.62 ??19.5 ??17.8 ??20.5 ??49.9 ??55.6 ??74.2 ??24.3
See that by data in the table displacement of reservoir oil scheme of optimization of C also has good oil displacement efficiency under factory's profit condition, and homemade table agent system oil displacement efficiency alive is suitable with import table agent ORS alive system oil displacement efficiency.
3), weak base system oil displacement experiment
Obtained by above numerical simulation and oil displacement experiment research, oil displacement system interfacial tension optimization range is 10 -2Near the mN/m, this makes and adopts the displacement of reservoir oil of weak base system to become possibility.Get the grand celebration table and live that to produce molecular weight be to measure weak base Na under 1,800 ten thousand polymer, the factory's profit condition for agent, Beijing 2CO 3The system interfacial tension, the mensuration of interfacial tension is got degassed crude and simulated oil respectively, and polymer concentration is 1200mg/L in the system, and determination data is listed by following table 17,18.
Table 17 weak base system interfacial tension table with test results (degassed crude) unit: mN/m
Table 18 weak base system interfacial tension table with test results (simulated oil) unit: mN/m
Test result shows that grand celebration is produced the weak base system of table agent alive under factory's degassed crude and simulated oil condition, and in the scope of measuring, the interfacial tension of system does not all reach 10 -3The mN/m scope, and see that the system interfacial tension does not have the obviously sign of reduction with table agent alive, alkali concn increase, be unfit to do the optimization of system interfacial tension in such cases and select; Yet notice, under the degassed crude condition, measure, when alkali concn can the system interfacial tension reach 1 * 10 0.8% the time substantially in table is lived agent broad concentration range -1＜σ＜1 * 10 -2Scope, and under the simulated oil condition, measuring, can table live agent and alkali concn more in the wide region system interfacial tension reach 1 * 10 -1＜σ＜1 * 10 -2Scope promptly is in the oil displacement system interfacial tension optimization range of determining with the highly basic system, gets table agent concentration 0.08% alive, Na in view of the above 2CO 3Concentration 0.8%, getting molecular weight is 1,800 ten thousand polymer, and concentration is the weak base system formulation of 1200mg/L, and substitution list 11 schemes 6 corresponding highly basic system formulation are formed weak base system displacement of reservoir oil scheme, finish two oil displacement experiments, and experiment key data and result are listed by table 19.
Table 19 different table agent weak base alive system formulation displacement of reservoir oil scheme oil displacement efficiency contrast table
Experiment The table agent alive place of production System parameter Slug viscosity Water drive recovery percent of reserves % Ternary is driven data
Interfacial tension 10 -2??mN/m Viscosity mPa.s Poly-1 mPa.s Poly-2 mPa.s Minimum moisture % Recovery percent of reserves % Increase and adopt amplitude %
??1 Grand celebration ??8.22 ??19.2 ??20.5 ??19.5 47.2 ??56.2 ??71.9 ??24.7
??2 Beijing ??6.23 ??18.9 ??20.5 ??19.7 46.9 ??49.9 ??70.8 ??23.9
Experimental result shows that weak base system formulation displacement of reservoir oil scheme has good oil displacement efficiency equally, and his-and-hers watches agent alive has the washability of broad.System formulation can be thought a weak base system formulation preferably in the experiment.

Claims (10)

1. method of optimizing system interfacial tension and ternary system prescription in the ternary composite driving, it is characterized in that: in the analog study of the enterprising line number value of three-dimensional geological model, on three-dimensional oil displacement experiment model, carry out the physical analogy oil displacement experiment, and both are combined determine system interfacial tension and ternary system prescription.
2. the method for system interfacial tension and ternary system prescription in the optimization ternary composite driving as claimed in claim 1 is characterized in that described numerical simulation study comprises:
Oil displacement efficiency when 1) calculating with method for numerical simulation that system is formed change in concentration in the ternary composite driving; Analysis result is set the oil displacement efficiency optimum value; Satisfy the calculation optimization scope of each concentration of component of optimum value condition correspondence, the ternary oil displacement system prescription that obtains calculating for each concentration of component;
Oil displacement efficiency when 2) calculating the variation of oil displacement system interfacial tension with method for numerical simulation; Analysis result is set the oil displacement efficiency optimum value; The system interfacial tension that satisfies optimum value condition correspondence is defined as the calculation optimization scope, the optimization system interfacial tension that obtains calculating.
3. the method for system interfacial tension and ternary system prescription in the optimization ternary composite driving as claimed in claim 1 or 2 is characterized in that described physical analogy oil displacement experiment comprises:
1) with the physical analogy oil displacement experiment to the ternary oil displacement system prescription of the calculating that obtains by the numerical simulation study examination correction that experimentizes;
2) with the physical analogy oil displacement experiment to the optimization system interfacial tension of the calculating that obtains by the numerical simulation study examination correction that experimentizes.
4. the method for system interfacial tension and ternary system prescription in the optimization ternary composite driving as claimed in claim 3, it is characterized in that: described three-dimensional geological model is determined according to the on-the-spot oil reservoir situation of the displacement of reservoir oil, be specially a simplified model: model structure is got 1/4th of a well group of " five-spot " well pattern, contain notes one and adopt Liang Koujing, oil reservoir plane homogeneous, vertical heterogeneity, divide the uniform thickness three layer construction, the layering permeability difference of different coefficient of permeability variation correspondences is abideed by the oil reservoir heterogeneous body rhythm situation substratum is arranged; For reflecting physicochemical change in the oil displacement process better, should get more relatively grid between well, recommend to get Nx=Ny=9, on the plane 81 grids; Determine the required geology of analog computation, fluid related data with reference to oil field reservoir geology and characteristic of fluid.
5. the method for system interfacial tension and ternary system prescription in the optimization ternary composite driving as claimed in claim 4 is characterized in that:
Use application software in the described numerical simulation calculation research, described application software has following main feature and function: it has materializing procedure complicated in pair oil displacement process perfect description relatively in detail, has description simultaneously to the main mechanism of oil displacement of ternary composite driving under rare system, promptly under the ternary system condition, low concentration surfactant, the cooperative effect of aqueous slkali, and produce ultralow interfacial tension between the crude oil, make the hollow billet number increase substantially, make that therefrom but the residual oil that can not flow reaches flow regime, again owing to polymer in the system exists solution that higher relatively viscosity is arranged, driving the liquid and the suitable relatively mobility ratio of formation between the crude oil that can flow thus, realization has high oil displacement efficiency to the remaining later residual oil extraction of water drive; Software should have computing function fast, can not only be used for mechanism of oil displacement research, and certain computational engineering practical problem ability should be arranged.
Calculating parameter is definite when using above-mentioned software:
The key parameter that requires in the calculating is live interfacial tension figure between agent, aqueous slkali and the crude oil and polymer, an alkaline concentration viscosity relationship curve of table, and these parameters should be the table selected for use the data that agent, alkali measure under field test (productions) district profit condition of living; Software should consider to show to live agent, alkali, polymer at underground absorption and relevant chemical change in the analog computation, and desired parameters also should still lack the current international data of The data with the data input of measuring under the oil field oil water condition.
6. the method for system interfacial tension and ternary system prescription in the optimization ternary composite driving as claimed in claim 3, it is characterized in that: the three-dimensional oil displacement experiment model that described physical analogy oil displacement experiment is selected for use, three-dimensional geological model geometric similarity with the analog computation employing: the model planar dimension is 32cm * 32cm, if the well pattern injector producer distance is Dm, the likelihood ratio of then actual oil reservoir and displacement of reservoir oil model is 70.7D: 32=2.21D: 1; Each substratum reaches and totally makes uniform thickness, and the substratum number of plies is three layers, and small thickness can reflect corresponding formation of seepage in oil reservoir in oil displacement process, if actual core intersection average out to Hm, described small thickness h 1=15.09H/D (cm); Technical indicators such as described three-dimensional physical model degree of porosity, permeability meet design requirement, and the oil displacement experiment result meets the oil field development actual conditions substantially, for satisfy the requirement of experiment small thickness, permeability can be amplified in proportion.
7. the method for system interfacial tension and ternary system prescription in the optimization ternary composite driving as claimed in claim 6, it is characterized in that: the main experimental procedure of described physical analogy oil displacement experiment: A) be simulated oil by displacement oil, take off vapour crude oil interpolation lightweight kerosene by well head and form, its viscosity is identical with underground crude oil; B) oil displacement experiment process: a, water drive moisture 98% o'clock water drive in the output liquid stops; B, injection ternary system slug; C, annotate follow-up polymer slug; D, annotate the clear water slug, moisturely in output liquid reach 98% o'clock oil displacement process once more and stop;
In the above-mentioned experimental procedure, fluid injection speed l=1.3337 * h * φ * D * V s(ml/h), in the formula, h is the three-dimensional physical model effective thickness, and φ is the three-dimensional physical model degree of porosity, and D is on-the-spot oil reservoir injector producer distance, V sBe on-the-spot oil reservoir ternary system slug injection rate; The oil displacement experiment effect is an evaluation index with the recovery ratio improvement value, recovery ratio improvement value=test final recovery percent of reserves-water drive recovery percent of reserves.
8. the method for system interfacial tension and ternary system prescription in the optimization ternary composite driving as claimed in claim 2, it is characterized in that: described oil displacement efficiency optimum value is meant the recovery ratio amplitude of raising: promptly well water was implemented ternary composite driving before being lower than 98%, go back up to 98% o'clock recovery percent of reserves again after descending with well water in the ternary composite driving process and be defined as the ternary composite driving recovery percent of reserves, it is the amplitude of adopting that increases of ternary composite driving with corresponding water drive scheme difference of recovery percent of reserves when the well water 98%.
9. the method for optimizing of ternary system prescription and system interfacial tension in the optimization ternary composite driving is characterized in that: adopt following steps:
1) sets up three-dimensional geological model, form, drop into the oil displacement efficiency of the identical ternary system displacement of reservoir oil scheme of chemical agent total cost with the numerical simulation calculation variable concentrations, the research system change in concentration is to the rule that influences of oil displacement efficiency, improvement value with the final integral recovery ratio is an index, and the prescription of selected ternary system optimization of formulation district and recommendation is formed;
2) set up three-dimensional oil displacement experiment model, with physical analogy completing steps 1) oil displacement experiment formed of recommended formula, check recommended formula oil displacement efficiency;
3) will be through step 2) prescription of preliminary examination forms and inserts in the displacement of reservoir oil scheme of determining structure, and under its framework, appropriateness is adjusted prescription and is formed concentration and carry out oil displacement experiment, prescription is formed further optimized;
4) the polymer concentration adjustment in the ternary system slug in the scheme of the prescription that step 3) is optimized, make the attainable underground activities viscosity of system viscosity and oil reservoir identical, follow-up polymer slug concentration also adjusts accordingly, and adjusted displacement of reservoir oil prescription is carried out the oil displacement experiment examination.
5) on the three-dimensional geological model with numerical simulation calculation under the oil field oil water condition, oil displacement efficiency when the system interfacial tension changes is an index with the improvement value of final integral recovery ratio, obtains the optimization range of system interfacial tension;
6) based on the displacement of reservoir oil scheme of step 4) physical analogy oil displacement experiment, adjust in the displacement of reservoir oil prescription and show live agent, alkali concn in the ternary system, make the tangible relatively different formulations displacement of reservoir oil scheme of system interfacial tension difference and finish oil displacement experiment, the analysis and research oil displacement efficiency is determined: the optimization range that A) is adapted to the system interfacial tension of this ternary compound oil drive oil body system; B) be adapted to the system optimization prescription that this ternary compound oil drive oil body is.
7) according to the retention rate of on-the-spot system viscosity and the polymer molecular weight of selecting for use, set-up procedure 6) polymer concentration of optimization formula and follow-up polymer slug concentration, obtain the oil field oil displacement process and implement displacement of reservoir oil scheme, slug underground activities viscosity at different levels can be with 6 in this scheme implementation process) in oil displacement experiment slug viscosity at different levels close, guarantee the good oil displacement efficiency of oil displacement process.
10. as the method for system interfacial tension and ternary system prescription in claim 3 or the 9 described optimization ternary composite drivings, it is characterized in that: select highly basic for use in the described ternary system, also can select weak base for use; When selecting the displacement of reservoir oil of weak base system for use, adopt the highly basic system to finish the preferred of system interfacial tension optimum range earlier, in the optimization range of system interfacial tension, prepare low concentration table agent weak base alive system formulation afterwards again, and prescription is examined or further optimization by oil displacement experiment.
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CN102061910A (en) * 2010-06-30 2011-05-18 中国石油大学(北京) Method for establishing waterflooding extraction predictable physical model of sandstone oil deposit
CN103940706A (en) * 2014-05-08 2014-07-23 中国石油天然气股份有限公司 Quantitative analysis method and determination method for interfacial tension performance of petroleum crude oil ternary composite system
CN105696986A (en) * 2014-12-09 2016-06-22 中国海洋石油总公司 Novel combination flooding oil flooding experiment/test simulating method
CN105696989A (en) * 2014-12-09 2016-06-22 中国海洋石油总公司 Determination method for combination flooding extra-high-efficiency oil flooding scheme for high viscosity and extra-ultralow interfacial tension system and combination oil flooding scheme for system
CN105696988A (en) * 2014-12-09 2016-06-22 中国海洋石油总公司 Determination method applied to combination flooding efficient oil flooding scheme under industrial well pattern condition and combination flooding efficient oil flooding scheme
CN105696985A (en) * 2014-12-09 2016-06-22 中国海洋石油总公司 Determination method for combination flooding efficient oil flooding scheme under condition of four-injection nine-mining well pattern and combination flooding efficient oil flooding scheme
CN106351626A (en) * 2016-09-29 2017-01-25 天津亿利科能源科技发展股份有限公司 Method for oil extraction by utilizing alkaline electrolysis water drive
CN106567698A (en) * 2016-11-07 2017-04-19 中国石油大学(北京) Method for increasing oil recovery rate through self-generation carbon dioxide system after polymer flooding
CN108920736A (en) * 2018-04-23 2018-11-30 中国石油化工股份有限公司 The tracking of interface surface activating agent
CN112651123A (en) * 2020-12-24 2021-04-13 大庆油田有限责任公司 Ternary combination flooding injection scheme design method
CN115193280A (en) * 2021-04-14 2022-10-18 天津大学 Method for establishing waste tributyl phosphate/kerosene emulsification formula

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102061910A (en) * 2010-06-30 2011-05-18 中国石油大学(北京) Method for establishing waterflooding extraction predictable physical model of sandstone oil deposit
CN103940706A (en) * 2014-05-08 2014-07-23 中国石油天然气股份有限公司 Quantitative analysis method and determination method for interfacial tension performance of petroleum crude oil ternary composite system
CN105696986B (en) * 2014-12-09 2018-06-26 中国海洋石油总公司 A kind of NEW TYPE OF COMPOSITE drives oil displacement experiment/test simulation method
CN105696988B (en) * 2014-12-09 2019-02-22 中国海洋石油总公司 The efficient Drainage process of combination flooding and its determining method under the conditions of industrialness well pattern
CN105696988A (en) * 2014-12-09 2016-06-22 中国海洋石油总公司 Determination method applied to combination flooding efficient oil flooding scheme under industrial well pattern condition and combination flooding efficient oil flooding scheme
CN105696985A (en) * 2014-12-09 2016-06-22 中国海洋石油总公司 Determination method for combination flooding efficient oil flooding scheme under condition of four-injection nine-mining well pattern and combination flooding efficient oil flooding scheme
CN105696989A (en) * 2014-12-09 2016-06-22 中国海洋石油总公司 Determination method for combination flooding extra-high-efficiency oil flooding scheme for high viscosity and extra-ultralow interfacial tension system and combination oil flooding scheme for system
CN105696986A (en) * 2014-12-09 2016-06-22 中国海洋石油总公司 Novel combination flooding oil flooding experiment/test simulating method
CN105696985B (en) * 2014-12-09 2018-07-24 中国海洋石油总公司 Four notes nine adopt the determination method and the efficient flooding method of combination flooding of the efficient flooding method of combination flooding under the conditions of well pattern
CN105696989B (en) * 2014-12-09 2019-02-22 中国海洋石油总公司 The glutinous special extra-high effect Drainage process of ultralow interfacial tension system of height and its determining method
CN106351626A (en) * 2016-09-29 2017-01-25 天津亿利科能源科技发展股份有限公司 Method for oil extraction by utilizing alkaline electrolysis water drive
CN106351626B (en) * 2016-09-29 2019-06-04 天津亿利科能源科技发展股份有限公司 A kind of oil production method using alkaline electrolysis water drive oil
CN106567698A (en) * 2016-11-07 2017-04-19 中国石油大学(北京) Method for increasing oil recovery rate through self-generation carbon dioxide system after polymer flooding
CN108920736A (en) * 2018-04-23 2018-11-30 中国石油化工股份有限公司 The tracking of interface surface activating agent
CN108920736B (en) * 2018-04-23 2022-02-22 中国石油化工股份有限公司 Method for tracking surfactant
CN112651123A (en) * 2020-12-24 2021-04-13 大庆油田有限责任公司 Ternary combination flooding injection scheme design method
CN112651123B (en) * 2020-12-24 2022-11-25 大庆油田有限责任公司 Ternary combination flooding injection scheme design method
CN115193280A (en) * 2021-04-14 2022-10-18 天津大学 Method for establishing waste tributyl phosphate/kerosene emulsification formula
CN115193280B (en) * 2021-04-14 2023-12-29 天津大学 Method for establishing waste tributyl phosphate/kerosene emulsion formula

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