CN103993862A - Stratification developing method for complex fault block thin oil reservoir - Google Patents
Stratification developing method for complex fault block thin oil reservoir Download PDFInfo
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Abstract
The invention discloses a stratification developing method for a complex fault block thin oil reservoir. The method comprises the steps that the structure of the oil reservoir to be developed and the magnitude of edge-bottom water oil reservoir energy are determined; on the basis of determining the structure, fine geological stratification is achieved, and development units are detailed to single sand bodies; on the basis of fine geological stratification, the reservoir properties of all the single sand bodies are evaluated, and the spacing layer distribution conditions and physical characteristics of all the single sand bodies are determined; on the basis of determining reservoir evaluation, the residual oil distribution law and residual recoverable reserves of all the single sand bodies are determined through development effect analysis; after the residual oil distribution law is determined, series of strata recombination boundaries of horizontal well deployment target layers and vertical well drilling reservoir are obtained by utilizing numerical simulation in combination with field experience; on the basis of determining the conditions, according to the stratification developing technology, well pattern overall planning and deployment are carried out, and the stratification developing scheme is complied. According to the stratification developing method, the usage degree of the oil reservoir reserves can be increased, the development effect of the oil reservoir can be improved, and the recovery efficiency of the oil reservoir is enhanced.
Description
Technical field
The present invention relates to oil field development field, particularly a kind of complex fault block ligh-oil reservoir hierarchical-development method.
Background technology
For complex fault block ligh-oil reservoir, there is the feature of complex geologic conditions.Described complex fault block ligh-oil reservoir complex geologic conditions generally shows: in plane, be mature fault; Have in the vertical the combination of many cover profits, the pure oil reservoir of stratiform, block limit bottom water reservoir exist simultaneously, and oil layer section span is large, the number of plies is many, and reservoir heterogeneity is strong.Due to the complexity of described complex fault block ligh-oil reservoir geological conditions, be difficult at present desirable development scheme and can reach desirable development effectiveness.
Taking Liaohe Faulted Depression basin thunder man 11 blocks of lotus flower oil reservoirs of area thunder as example, since two thousand four, described oil reservoir is implemented a set of pattern flooding exploitation by 210 meters of well spacings, dependence scale Productivity Construction and plane, longitudinally injection and extraction system adjustment, initial stage is seen certain effect, but after 2008, the obvious variation of block development effectiveness, year produce oil declines 1.5 to 2 × 10 with year
4the sharply atrophy of speed of ton, natural declining rate is up to more than 25%, its main cause is because Productivity Construction finishes substantially on the one hand, conventional a set of pattern flooding limitation on the other hand, main manifestations is that longitudinally upper reserves are employed inequality, and longitudinally go up that the number of plies is many, non-homogeneity is strong and Oil Reservoir Types various be to cause reserves to employ uneven principal element, how effectively employing each cover reservoir reserves is to realize the problem that oil reservoir effective exploitation need to solve.
Have at present a lot of and 11 blocks of oil reservoirs of the same type of thunder both at home and abroad, its Problems is similar to 11 of thunders, there is no effective development scheme and improves recovery ratio.
Summary of the invention
The object of this invention is to provide a kind of complex fault block ligh-oil reservoir effective exploitation method, improve the development effectiveness of oil reservoir, improve the recovery ratio of oil reservoir.
For achieving the above object, technical scheme provided by the invention is as described below:
A kind of complex fault block ligh-oil reservoir hierarchical-development method, comprising:
S1: determine water energy size at the bottom of the structure, limit of oil reservoir to be developed;
S2: determining on the basis of structure, realize fine geology layering, segmentation development block is to single sand body;
S3: on the basis of fine geology layering, each single sand body is carried out to reservoir property evaluation, implement each single sand body wall distribution situation, physical property characteristic;
S4: on definite evaluating reservoir basis, analyze by development effectiveness, determine each single sand body Remaining Oil Distribution and residual recoverable reserves size;
S5: determining after Remaining Oil Distribution, utilizing numerical simulation, obtain horizontal well deployment target zone and straight well exploitation reservoir series of strata restructuring boundary in conjunction with field experience;
S6: on definite above-mentioned condition basis, according to hierarchical-development technology, implement well pattern integrated planning and dispose, establishment hierarchical-development scheme.
In a preferred embodiment, the technology of hierarchical-development described in S6 is utilized horizontal well development for limit bottom water reservoir, and concrete has the oil recovery of mudstone barriers advantage growth single sand body carrying out horizontal well to add the exploitation of straight well water filling combination for upper and lower in pure oil reservoir; For laminar reservior enforcement straight well net subdivision injection exploitation mutually in pure oil reservoir; Implement Advance Water Injection exploitation for the poor low-permeability layer of reservoir properties in pure oil reservoir.
In a preferred embodiment, described in S5, determine that horizontal well deployment target zone boundary comprises definite deployment target zone thickness, permeability, permeability grade, average oil saturation, single control recoverable reserves, horizontal section length, keeps away end water thickness, pressure coefficient, the reasonable production fluid amount of horizontal well, horizontal well orientation; Described definite straight well exploitation reservoir series of strata restructuring boundary comprises permeability grade, saturation ratio difference, pressure coefficient difference between definite each single sand body, closes and adopt the superimposed number of plies of single sand body, superimposed thickness, the reasonable daily fluid production rate of straight well.
In a preferred embodiment, described in S4, determine that each single sand body Remaining Oil Distribution and residual recoverable reserves size are concrete by each single sand body development effectiveness is evaluated, implement each single sand body reserves, accumulation extraction situation, current production capacity, pressure, and then portray remaining oil distribution situation and residual recoverable reserves size in each single sand body plane.
In a preferred embodiment, described in S3, each single sand body is carried out to reservoir property evaluation and comprise definite degree of porosity, permeability, oil saturation, shale content, pressure size; Described implementing every interbed distribution situation, physical property characteristic is specially and determines each distribution, varied in thickness situation and degree of porosity thereof, permeability in interlayer plane.
In a preferred embodiment, described in S2, realize fine geology layering specifically by under reference lamina control, according to the cycle of sedimentation, by subdivision of reservoir to sandstone group; According to resistance, the return feature of induction curve, in conjunction with sedimentary rhythm, described sandstone group is segmented to single sand body again.
In a preferred embodiment, described in S1, definite oil reservoir to be developed is constructed specifically by utilizing artificial synthetic seismogram, implement each sandstone group top bottom interface with simultaneously, three dimensional seismic data is proofreaied and correct, in conjunction with three dimensional seismic data, realized well shake combination, each each well sandstone group end, top, is projected on 3-D seismics, according to 3-D seismic interpretation response situation, depict Cross-well fault position, implement oil reservoir structure; At the bottom of described definite limit water energy size specifically by elasticity drive, elasticity-Bian bottom water drive reservoir matter balance equation formula calculates elasticity productive rate, water influx, water oil volume ratio.
Beneficial effect: the invention provides a kind of complex fault block ligh-oil reservoir hierarchical-development method, with respect to the scheme of original a set of pattern flooding exploitation, the present invention is directed to upper and lowerly in pure oil reservoir has mudstone barriers advantage to grow single sand body carrying out horizontal well to recover the oil and add the exploitation of straight well water filling combination; For laminar reservior enforcement straight well net subdivision injection exploitation mutually in pure oil reservoir; Implement Advance Water Injection exploitation for the poor low-permeability layer of reservoir properties in pure oil reservoir.The described method of hierarchical-development targetedly can improve reservoir reserve development degree, improves the development effectiveness of oil reservoir, improves the recovery ratio of complex fault block ligh-oil reservoir.
Brief description of the drawings
Fig. 1 is complex fault block ligh-oil reservoir hierarchical-development method flow schematic diagram in the embodiment of the present invention;
Fig. 2 is artificial composite traces figure in the invention process;
Fig. 3 is that in the invention process, oil well is combined figure with 3-D seismics;
Fig. 4 is 11 lotus flower oil reservoir well location deployment diagrams of thunder in the embodiment of the present invention;
Fig. 5 is that in the embodiment of the present invention, 11 blocks of lotus flower oil reservoirs of thunder are longitudinally gone up reservoir distribution figure;
Fig. 6 be in the embodiment of the present invention thunder see 1 longitudinally upper V to single sand Division into groups of rock mass figure in VII sandstone group;
Fig. 7 is the interior VII 1 of VII sandstone group and VII 2 wall distribution maps in the embodiment of the present invention;
Fig. 8 is interbed distribution figure between VII 2 and VII 3 in VII sandstone group in the embodiment of the present invention;
Fig. 9 is the longitudinally upper each individual layer residual recoverable reserves distribution situation figure of 11 blocks of lotus flower oil reservoirs of thunder in the embodiment of the present invention;
Figure 10 is remaining oil distribution condition diagram in 11 lotus flower oil reservoir planes of thunder in the embodiment of the present invention;
Figure 11 is 11 lotus flower oil reservoir hierarchical-development ideographs of thunder in the embodiment of the present invention;
Figure 12 is 219 horizontal well thunder 11-lotus H703 plane deploy figure of thunder in the embodiment of the present invention;
Figure 13 is 219 longitudinal deploy figure of horizontal well thunder 11-lotus H703 of thunder in the embodiment of the present invention;
Figure 14 is 219 horizontal well thunder 11-lotus H703 production curve figure of thunder in the embodiment of the present invention;
Figure 15 is that in the embodiment of the present invention, thunder is seen 1 horizontal well thunder 11-lotus H501 plane deploy figure;
Figure 16 is that in the embodiment of the present invention, thunder is seen 1 horizontal well thunder 11-longitudinal deploy figure of lotus H501 and note is adopted corresponding diagram;
Figure 17 is that in the embodiment of the present invention, thunder is seen 1 horizontal well thunder 11-lotus H501 production curve figure;
Figure 18 is that in the embodiment of the present invention, thunder is seen 1 thunder 23-10, thunder 24-10 plane deploy figure;
Figure 19 is that in the embodiment of the present invention, thunder sight 1 thunder 23-10, thunder 24-10 production curve and water filling is schemed by effect;
Figure 20 is thunder 21-8 well group I to the IV sandstone group Advance Water Injection curve map that takes effect in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing and instantiation, technical scheme of the present invention is elaborated, be to be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described, after having read the present invention, those skilled in the art all fall in the application's claims limited range the amendment of the various equivalent form of values of the present invention.
The invention provides a kind of complex fault block ligh-oil reservoir hierarchical-development method, at the ligh-oil reservoir of complex fault block described in example hierarchical-development method flow schematic diagram as described in Figure 1, comprising:
S1: determine water energy size at the bottom of the structure, limit of oil reservoir to be developed;
S2: determining on the basis of structure, realize fine geology layering, segmentation development block;
S3: on the basis of fine geology layering, each single sand body is carried out to reservoir property evaluation, implement each single sand body wall distribution situation, physical property characteristic;
S4: on definite evaluating reservoir basis, analyze by development effectiveness, determine each single sand body Remaining Oil Distribution and residual recoverable reserves size;
S5: determining after Remaining Oil Distribution, utilizing numerical simulation, obtain horizontal well deployment target zone and straight well exploitation reservoir series of strata restructuring boundary in conjunction with field experience;
S6: on definite above-mentioned condition basis, according to hierarchical-development technology, implement well pattern integrated planning and dispose, establishment hierarchical-development scheme.
Wherein described in S1, definite oil reservoir to be developed is constructed specifically by utilizing artificial synthetic seismogram, implement each sandstone group top bottom interface with simultaneously, three dimensional seismic data is proofreaied and correct, in conjunction with three dimensional seismic data, realize well shake combination, each each well sandstone group end, top is projected on 3-D seismics, according to 3-D seismic interpretation response situation, depict Cross-well fault position, implement oil reservoir structure.Described in S1, determine at the bottom of limit water energy size specifically by elasticity drive, elasticity-Bian bottom water drive reservoir matter balance equation formula calculates elasticity productive rate, water influx, water oil volume ratio.
Be specifically described as an example of 11 lotus flower oil reservoir complex fault block ligh-oil reservoirs of thunder example in the present invention.Described definite oil reservoir structure to be developed, refers to utilize artificial composite traces figure, as shown in Figure 2, determines individual well lotus flower oil reservoir V, VI, VII sandstone group end face structure.Because three dimensional seismic data may exist unintelligible place in admission process, available artificial composite traces is proofreaied and correct, and by pulling well 3-D seismics section, Jiang Gejing projects on 3-D seismics, obtain oil well and be combined figure with 3-D seismics as shown in Figure 3, realize well shake combination.According to 3-D seismics response situation between well and well, meticulous depiction goes out Cross-well fault position, implements each sandstone set constructor.
From plane, as shown in Figure 4, be 11 lotus flower oil reservoir well location deployment diagrams of thunder.In 11 lotus flower oil reservoir planes of described thunder, mainly contain 10 tomographies, block is divided into 8 fault blocks by it, wherein has 4 main force's fault blocks, is respectively: 35 of thunders, 2713 of thunders, thunder are seen 219 of 1 and thunders.11 lotus flower oil reservoir total oil content area 2.42 sq-kms of described thunder, 3,850,000 tons of petroleum-in-places.Look up from vertical, as shown in Figure 5, for 11 blocks of lotus flower oil reservoirs of thunder are longitudinally gone up reservoir distribution figure.Shown in the longitudinally upper 7 cover sandstone groups of growing of 11 blocks of lotus flower oil reservoirs of thunder.Described 7 cover Sandstone Compositions are that lotus flower oil reservoir I is to VII sandstone group.Described 7 cover sandstone groups are close according to character, feature similarity principle is divided into I to IV sandstone group, V sandstone group, VI sandstone group, VII sandstone group totally four covers greatly.Wherein main force's straticulate exploration is that V is to VII sandstone group.Described I to IV sandstone group is only grown in 219 parts of thunder.Described V, VI sand are pure oil reservoir.Described VII sandstone group is block limit bottom water reservoir.Each sandstone group under described each main force's fault block and main force's fault block all has independently oil-water interfaces and pressure system, reservoir plane continuity from above at described oil reservoir is poor, and reservoir heterogeneity is serious, is embodied in the inner coefficient of heterogeneity 4.23 of described oil reservoir group, the coefficient of variation 0.86, permeability extreme difference 136, the inner coefficient of heterogeneity approximately 3.0 of sandstone group, the coefficient of variation approximately 0.9, permeability extreme difference is less than 100, coefficient of heterogeneity approximately 2.8 in single sand body, the coefficient of variation is less than 1, permeability extreme difference 50 left and right.11 lotus flower reservoir heterogeneities of described thunder are serious, need to, from longitudinally segmentation unit exploitation, realize reserves and effectively employ.Water energy size at the bottom of described limit, is mainly reflected in water oil volume than upper, and thunder 219, thunder sight 1, thunder 2713,35 water oil volume ratios of thunder are respectively 22:1,12:1,15:1; 18:1, average out to 16:1.
Described in S2, realize fine geology layering specifically by under reference lamina control, according to the cycle of sedimentation, by subdivision of reservoir to sandstone group; According to resistance, the return feature of induction curve, in conjunction with sedimentary rhythm, described sandstone group is segmented to single sand body again.
Described fine geology layering, to implement on each sandstone set constructor basis, by the detail correlation of reservoir bed between well, electrical property feature and sedimentary rhythm, each sandstone group is segmented to substratum, according to every interlayer feature, substratum is segmented to single sand body again, understand fully each single sand body distribution situation, deposition characteristics and micro-structure thereof in the plane, to V, the inner upper and lower mudstone barriers advantage single sand body reservoir that has of VI sandstone group, need distribution characteristics in meticulous depiction plane.See 1 as example taking thunder in 11 blocks of lotus flower oil reservoirs of thunder, as shown in Figure 6, thunder is seen 1 longitudinally upper V to single sand Division into groups of rock mass figure in VII sandstone group.Wherein V Sandstone Compositions is 5 cover substratum, wherein L5
3, L5
4, L5
5for main force's substratum, and L5
4can be subdivided into L5
4-1, L5
4-2 two single sand bodies, L5
3, L5
5there is a good mudstone barriers single sand body for upper and lower, be applicable to horizontal well and dispose; VI Sandstone Compositions is 5 cover substratum, wherein L6
3, L6
4, L6
5for main force's substratum, L6
3, L6
4, L6
5all can be subdivided into 2 single sand bodies, i.e. L6
3-1, L6
3-2, L6
4-1, L6
4-2, L6
5-1, L6
5-2; VII sandstone group is subdivided into L7
1, L7
2, L7
3three single sand bodies.
Described in S3, each single sand body is carried out to reservoir property evaluation and comprise definite degree of porosity, permeability, oil saturation, shale content, pressure size; Described implementing every interbed distribution situation, physical property characteristic is specially and determines each distribution, varied in thickness situation and degree of porosity thereof, permeability in interlayer plane, finally determines its whether blocking property.
Described reservoir property, mainly refer to reservoir permeability, degree of porosity, oil saturation, shale content, pressure size etc., wherein permeability is reservoir properties quality principal element, evaluating reservoir is mainly referred to reservoir permeability is analyzed, the each single sand body configuration relation of reasonable combination, reduce reservoir heterogeneity, improve each single sand body reserves development degree.Described reduction reservoir heterogeneity specifically refers to is down to permeability extreme difference, the coefficient of advancing by leaps and bounds in 1.0 left and right, and described permeability extreme difference refers to the ratio of maximum permeability and minimum permeability; The described coefficient of advancing by leaps and bounds refers to the ratio of maximum permeability and mean permeability; Described reduction reservoir heterogeneity can lay the foundation for V, the mutual laminar reservior straight well of VI sandstone group net subdivision injection exploitation interval.Taking 219 of thunders as example, as shown in table 1, described V sandstone group laminar reservior single sand body can be subdivided into: single sand body L5
1-1, single sand body L5
2-1, single sand body L5
2-2, single sand body L5
3-1, single sand body L5
3-2, single sand body L5
4-1, single sand body L5
5-1, by single sand body L5
1-1, L5
2-1, L5
2-2, single L5
3-1, L5
3-2 the 1st group together of combination, single sand body L5
4-1, L5
5-1 is the 2nd group, and as calculated, the 1st group of permeability extreme difference is 2.4, and the coefficient of advancing by leaps and bounds is 1.8; The 2nd group of permeability extreme difference is 1.4, and the coefficient of advancing by leaps and bounds is 1.2.Because the 1st group of permeability extreme difference and the coefficient and 1.0 of advancing by leaps and bounds differ also larger, need again divide into groups on this basis, be further divided into the 11st group by the 1st group: single sand body L5
1-1, single L5
3-1, L5
3-2; The 12nd group: single sand body L5
2-1, L5
2-2, as calculated, the 11st group of permeability extreme difference is 1.2, and the coefficient of advancing by leaps and bounds is 1.1; The 12nd group of permeability extreme difference is 1.2, and the coefficient of advancing by leaps and bounds is 1.2, all approaches 1.0, meets the requirements.
Table 1
Described each single-layer interval distribution situation, physical property characteristic refer to every interlayer varied in thickness situation and block thereof in the plane, in general, interlayer refers to grows non-infiltration and the tight stratum that in oil-bearing series or in combination pool, can separate upper and lower oil-gas Layer or upper and lower oil-gas reservoir, but for limit bottom water reservoir, along with recovery percent of reserves improves, at the bottom of higher-energy limit, can break through stopping of interlayer, cause waterflood; And interlayer is the relative impervious bed distributing in sandstone group, distribute unstable, can not effectively stop or control the motion of fluid, electrical property feature has obviously return, and thickness is generally less than 1 meter.According to 11 blocks of lotus flower oil reservoirs of thunder every interlayer feature, in conjunction with the oil-water well means of production, set up every, interlayer criteria for classifying template, as shown in table 2, table 3, implement exhibition step feature in each single sand body spacer interlayers plane, especially meticulous depiction is carried out to every interbed distribution situation in bottom water reservoir inside, VII sandstone group limit.As shown in Fig. 7 to Fig. 8, wherein Fig. 7 is VII 1 and VII 2 wall distribution maps in VII sandstone group, and Fig. 8 is interbed distribution figure between the interior VII 2 of VII sandstone group and VII 3.In figure, color is darker shows that the thickness of spacer interlayers is larger, and the thickness of the more shallow described spacer interlayers of color is thinner, and the most of region of main force fault block is all in every, interlayer thinner region, and due to water energy abundance at the bottom of oil reservoir VII sandstone group, bottom water coning is serious at present.
Table 2
Table 3
Described in S4, determine that each single sand body Remaining Oil Distribution and residual recoverable reserves size are concrete by each single sand body development effectiveness is evaluated, implement each single sand body reserves, accumulation extraction situation, current production capacity, pressure, portray remaining oil distribution situation and residual recoverable reserves size in each single sand body plane, thereby dispose foundation is provided for well location.
Evaluate by described development effectiveness, determine each single sand body oil in place, residual recoverable reserves, current production capacity, press water equality, draw Remaining Oil Distribution figure in plane, selects water flooding degree low area, longitudinally goes up residual recoverable reserves enriched layer position and carry out well location deployment in preferred planar.Be illustrated in figure 9 the longitudinally upper each individual layer residual recoverable reserves distribution situation figure of 11 blocks of lotus flower oil reservoirs of thunder.Described distribution situation figure has described the residual recoverable reserves of 4 main force's fault blocks, is respectively from right to left: 35 of thunders, 2713 of thunders, thunder are seen 219 of 1 and thunders.In figure, abscissa represents the recoverable reserves of each single sand body, and unit is 10,000 tons, and ordinate corresponds to each single sand body.From described each single sand body residual recoverable reserves distribution situation figure, can significantly find out the remaining oil enrichment layer position of described oil reservoir.Be remaining oil distribution condition diagram in 11 lotus flower oil reservoir planes of thunder as shown in figure 10, in described figure, having compared with the place of dark gray is reserve.By determining the distribution situation of remaining oil in plane and longitudinally, can provide foundation for the deployment of well location.
Described in S5, determine that horizontal well deployment target zone boundary comprises definite deployment target zone thickness, permeability, permeability grade, average oil saturation, single control recoverable reserves, horizontal section length, keeps away end water thickness, pressure coefficient, the reasonable production fluid amount of horizontal well, horizontal well orientation; Described definite straight well exploitation reservoir series of strata restructuring boundary comprises permeability grade, saturation ratio difference, pressure coefficient difference between definite each single sand body, closes and adopt the superimposed number of plies of single sand body, superimposed thickness, the reasonable daily fluid production rate of straight well.
When concrete enforcement, utilize numerical simulation, determine that VII sandstone group horizontal well is disposed target zone and straight well is exploited reservoir series of strata restructuring limits criteria.As shown in table 4, the leading indicator that described horizontal well is disposed target zone limits criteria comprises: target zone thickness, reservoir permeability, permeability grade, average oil saturation, single control recoverable reserves, horizontal section length, keep away between end water thickness, pressure coefficient, horizontal well orientation, horizontal well rationally array pitch, straight flat combination flooding pattern Injection-production Well Spacing, the reasonable production fluid amount of horizontal well.As shown in table 5, described straight well exploitation reservoir series of strata restructuring limits criteria comprises closing to be adopted permeability grade between substratum, saturation ratio difference, pressure difference value, closes and adopt the number of plies, close and adopt thickness, straight well and rationally adopt liquid measure etc.In the time determining described limits criteria, need carry out reservoir engineering and field test, in conjunction with both data, finally disposed boundary.In described table 4,11 lotus flower oil reservoir VII sandstone group horizontal wells of thunder are disposed boundary, 11 lotus flower oil reservoir V of thunder, VI sandstone group straight well exploitation reservoir series of strata restructuring limits criteria in described table 5.
Table 4
| Leading indicator | Reservoir engineering | Field test | Dispose boundary |
| Target zone thickness (rice) | 3～15 | 6～10 | 5～15 |
| Reservoir permeability (millidarcy) | 200～500 | 180～457 | >200 |
| Permeability grade | 2.0～3.5 | 2.5～3.3 | <3 |
| Average oil saturation % | 0.44～0.6 | 0.46～0.55 | >0.44 |
| Single control recoverable reserves (ten thousand tons) | 0.83～2.0 | 1.37～2.12 | >1.2 |
| Horizontal section length (rice) | 150～300 | 220～302 | 150～300 |
| Keep away end water thickness (rice) | 5～13 | 7～21 | >7 |
| Pressure coefficient | >0.55 | 0.75～0.91 | >0.55 |
| Horizontal well orientation | Plan-parallel structure line | Substantially parallel structural line | Plan-parallel structure line |
| The reasonable production fluid amount of horizontal well (t/d) | 12～22 | 15～18 | 20 |
| Reasonable array pitch (rice) between horizontal well | 120～180 | 150～200 | 150～200 |
| Straight flat combination well pattern Injection-production Well Spacing (rice) | 130～200 | 150～180 | 150～180 |
Table 5
| Leading indicator | Reservoir engineering | Field test | Limits criteria |
| Permeability grade | <4.5 | <5 | <5 |
| Interlayer saturation ratio difference | <0.2 | <0.2 | <0.2 |
| Interlayer pressure difference | <0.25 | <0.2 | <0.2 |
| Superimposed thickness (rice) | 10～18 | 7～20 | 7～20 |
| The superimposed number of plies | 6 | 8 | 8 |
| The reasonable daily fluid production rate of straight well (side/day) | 10 | 9 | 9 |
When in described S6, hierarchical-development case is determined, totally follow: utilize horizontal well development for oil reservoir at the bottom of limit; To have thickness be that the mudstone barriers advantage of 3 meters to 5 meters is grown single sand body and adopted carrying out horizontal well to recover the oil to add the exploitation of straight well water filling combination for upper and lower in pure oil reservoir; For in pure oil reservoir mutually laminar reservior implement the exploitation of straight well net subdivision injection, wherein said mutual laminar reservior refers to that interlayer grows, and is generally less than the reservoir that the low-permeability layer of 0.5 meter, middle infiltration layer, high permeability formation replace mutually; Be less than 50 × 10 for general permeability
-3square micron, degree of porosity is less than the poor low-permeability layer of reservoir properties in 10% pure oil reservoir and implements Advance Water Injection exploitation.
As shown in figure 11, in conjunction with the concrete condition of 11 blocks of lotus flower oil reservoirs of thunder, respectively overlap reservoir reserves for effectively employing 11 lotus flower oil reservoir complex fault block ligh-oil reservoirs of thunder, can formulate following hierarchical-development ideograph.It is 1. wherein VII sandstone group limit bottom water drive horizontal well development.2. for V has mudstone barriers advantage single sand body to utilize horizontal well development to upper and lower in VI sandstone group.3. for V to VI sandstone group internal mutual laminar reservior utilizes the exploitation of straight well net subdivision injection.4. I to IV sandstone group low permeability reservoir is implemented Advance Water Injection exploitation.
Concrete technological means is as follows:
For water ligh-oil reservoir at the bottom of described VII sandstone group, end water energy abundance, utilize straight well exploitation, producing pressure differential is large, cause bottom water coning serious, for reducing producing pressure differential, suppress bottom water coning, with ripe Horizontal Well Drilling in recent years, completion technique is basis, according to the moving static data of oil reservoir, utilize method for numerical simulation, in conjunction with field test, determine the parameters of horizontal well, comprise that parameters comprises: target zone thickness, reservoir permeability, permeability grade, average oil saturation, single control recoverable reserves, horizontal section length, keep away end water thickness, pressure coefficient, horizontal well orientation etc., dispose horizontal well by band between bottom water cone, fully employ and utilize straight well cannot exploit remaining oil potential.
For described V to VI sandstone group, because longitudinally upper non-homogeneity is strong, utilize a set of well pattern to close to adopt and close note, exist reserves to employ uneven problem, for this reason, on fine geology hierarchical basis, for its internal mutual laminar reservior, according to each single sand body permeability situation, the each single sand body syntagmatic of reasonable disposition, reduce non-homogeneity degree, implement the exploitation of straight well net subdivision injection, improve water drive reserves development degree, simultaneously, utilize numerical simulation, determine straight well rational exploitation interval, comprise respectively closing and adopt permeability grade between single sand body, saturation ratio difference, pressure difference value, close and adopt the number of plies, close and adopt thickness, straight well is rationally adopted liquid measure etc., effectively employ each single sand body remaining oil recoverable reserves.Stablize the advantage single sand body of mudstone barriers for the upper and lower growth in its inside, because its reservoir properties is good, water absorption is large, affect other reservoir water suction situation, can utilize separately a set of well pattern, implement straight well water filling and horizontal well production combination and exploit, increase drainage area, improve reserves control degree.
For described I, to IV sandstone group, because it is that sand, mud stone thin interbed shape spy are hypotonic, low permeability reservoir, mean permeability is 48 × 10
-3square micron, average pore is 8%, for this type of reservoir characteristics, implements Advance Water Injection, improves stratum inner fluid driving pressure, strengthens stratum energy supplement, at utmost brings into play oil reservoir potential.
Be further described below in conjunction with concrete situation in 11 lotus flower oil reservoir hierarchical-development processes of thunder.
Described VII sandstone group is in the time implementing limit bottom water drive horizontal well development, on described oil reservoir, implement altogether 8 mouthfuls of water horizontal wells, average day at individual well initial stage 19 tons of production fluids, 13 tons of day produce oils, moisture 31.6%, 18 tons of day production fluids at present, 12.4 tons of day produce oils, moisture 31.2%, it is stable that output keeps, and obtained desirable development effectiveness.
Specifically, taking 219 horizontal well thunder 11-lotus H703 of thunder as example, its deployment in the plane as shown in figure 12, is disposed as shown in figure 13 in the vertical, and deployment tier position is to bring between single sand body VII 1 bottom water cone.Described horizontal well thunder 11-lotus H703 is after going into operation on May 9th, 2012, and as shown in figure 14, day production fluid, daily output oil content are not stabilized in 20 tons, 13 tons left and right, 2000 tons of tired produce oils.Between described horizontal well and VII sandstone group bottom water cone, region straight well is compared, and daily fluid production rate is similar, and daily oil production is 5 times of left and right of straight well.This explanation horizontal well has the end of falling producing pressure differential, steady water to increase oily ability, can fully excavate between bottom water cone and be with remaining oil potential, has solved the difficult problem that cannot utilize straight well to exploit with remaining oil between described bottom water cone.
Described V has mudstone barriers advantage single sand body to adopt straight flat combination waterflooding extraction to VI sandstone group is inner upper and lower, carrying out horizontal Jing3Kou altogether, 3 mouthfuls, metaideophone well, average individual well day, production fluid, daily output oil content be not stabilized in 13 tons, 10 tons left and right, moisture fluctuation range 20% to 23%, compared with straight well, daily fluid production rate, daily oil production are 3 to 4 times of straight wells.
See 1 horizontal well thunder 11-lotus H501 as example taking thunder, its deployment in the plane as shown in figure 15, is disposed as shown in figure 16 in the vertical, and its deployment tier position is advantage single sand body V 3.This well is gone into operation on June 6th, 2012, and as shown in figure 17, day production fluid, daily output oil content are not stabilized in 16 tons, 10 tons, 1400 tons of tired produce oils.Day produce oil is 3.2 times of same producing zone position straight well thunder 25-10.As shown in figure 16, for improving described straight flat combination flooding pattern, by straight well thunder 25-09 metaideophone, implement straight flat combination " one to one " water filling, horizontal well production is steadily increasing, sees flood effectiveness.
Described V to other mutual laminar reservior after the inner removal advantage of VI sandstone group single sand body utilizes the exploitation of straight well net subdivision injection, dispose altogether and implement 8 mouthfuls of straight wells, and flooding pattern is planned, the old Jing4Kou of metaideophone, average individual well day, production fluid, daily output oil content be not stabilized in 12.6 tons, 7.2 tons, reach design production capacity, and see better flood effectiveness.
Taking thunder 23-10, thunder 24-10 well as example, as shown in figure 18,2 mouthfuls of wells are all deployed in thunder and see 1 in its deployment in the plane, and the layer position of going into operation is VI sandstone group, carries out perforated interval optimization according to table 5 standard, obtains better effects after operation.As shown in figure 19, production fluid, a day produce oil are 17.5 tons, 8.8 tons thunder 23-10 well day at initial stage; Thunder 24-10 well initial stage blowing is produced, and day production fluid, a day produce oil are 21.2 tons, 16 tons.In addition, for realizing straight well net subdivision injection, by thunder 24-11 well metaideophone, according to each single sand body permeability size in VI sandstone group, optimize injecting interval, implement three sections of seperated layer water injections of secondary, thunder 23-10, thunder 24-10 all see flood effectiveness, and output is steadily increasing.Thunder 23-10 day production fluid, a day produce oil are 16.2 tons, 8.1 tons at present, 1300 tons of tired produce oils; Thunder 24-10 day production fluid, a day produce oil are 15.6 tons, 13.1 tons, 2150 tons of tired produce oils.
Described I implementing Advance Water Injection exploitation, is implemented 4 well groups to IV sandstone group altogether.Taking thunder 21-8 well group as example, as shown in figure 20, water injection well thunder 21-8, in metaideophone on July 12nd, 2010, implements Advance Water Injection, day water filling 20 sides, initial stage water injection pressure 4MPa, along with water injection rate increases, water injection pressure raises gradually, and on August 14th, 2012, water injection pressure was up to 18MPa.By pressure monitoring, in well group, also rise to 16MPa by 10MPa in closing well state oil well thunder 22-7 static pressure, illustrate that stratum energy is supplemented preferably.For this reason, reproduce thunder 22-7 well in October, 2012, and other 2 mouthfuls of oil well thunder 21-9 in well group and high 2-04-2 are implemented to mend layer, further improves note and adopt corresponding relation, obtains better effects.Wherein thunder 22-7 well day production fluid, a day produce oil rise to 7 tons, 4.5 tons by 3 tons, 1.3 tons, stable yield, at present tired 1020 tons of the oil that increase.Thunder 21-9 and high average individual well day of 2-04-2 well 6.8 tons of production fluids, average individual well day 3.6 tons of produce oils, oil production intensity is 0.65 ton of/day rice, reaches block V and ooze reservoir oil production intensity level to VI sandstone group.
The present invention is directed to complex fault block ligh-oil reservoir and propose a kind of hierarchical-development method, formulate for different reservoir the development scheme that adapts.By determining structure, the limit bottom water reservoir energy size of oil reservoir to be developed, realize fine geology layering, refinement development block, carries out reservoir property evaluation to each single sand body, implements each single sand body wall distribution situation, physical property characteristic; By each single sand body development effectiveness is analyzed, determine its Remaining Oil Distribution and residual recoverable reserves size; Utilize numerical simulation, obtain horizontal well deployment target zone and straight well exploitation reservoir series of strata restructuring boundary in conjunction with field experience; On definite above-mentioned condition basis, according to hierarchical-development technology, to implement well pattern integrated planning and dispose, establishment hierarchical-development scheme, instructs the exploitation of complex fault block ligh-oil reservoir, reaches the object that improves reservoir reserve development degree, improves block recovery ratio.
Claims (7)
1. a complex fault block ligh-oil reservoir hierarchical-development method, is characterized in that, comprising:
S1: determine water energy size at the bottom of the structure, limit of oil reservoir to be developed;
S2: determining on the basis of structure, realize fine geology layering, segmentation development block is to single sand body;
S3: on the basis of fine geology layering, each single sand body is carried out to reservoir property evaluation, implement each single sand body wall distribution situation, physical property characteristic;
S4: on definite evaluating reservoir basis, analyze by development effectiveness, determine each single sand body Remaining Oil Distribution and residual recoverable reserves size;
S5: determining after Remaining Oil Distribution, utilizing numerical simulation, obtain horizontal well deployment target zone and straight well exploitation reservoir series of strata restructuring boundary in conjunction with field experience;
S6: on definite above-mentioned condition basis, according to hierarchical-development technology, implement well pattern integrated planning and dispose, establishment hierarchical-development scheme.
2. a kind of complex fault block ligh-oil reservoir hierarchical-development method as claimed in claim 1, it is characterized in that: the technology of hierarchical-development described in S6 is utilized horizontal well development for limit bottom water reservoir, concrete has the oil recovery of mudstone barriers advantage growth single sand body carrying out horizontal well to add the exploitation of straight well water filling combination for upper and lower in pure oil reservoir; For laminar reservior enforcement straight well net subdivision injection exploitation mutually in pure oil reservoir; Implement Advance Water Injection exploitation for the poor low-permeability layer of reservoir properties in pure oil reservoir.
3. a kind of complex fault block ligh-oil reservoir hierarchical-development method as claimed in claim 1, is characterized in that: described in S5, determine that horizontal well deployment target zone boundary comprises definite deployment target zone thickness, permeability, permeability grade, average oil saturation, single control recoverable reserves, horizontal section length, keeps away end water thickness, pressure coefficient, the reasonable production fluid amount of horizontal well, horizontal well orientation; Described definite straight well exploitation reservoir series of strata restructuring boundary comprises permeability grade, saturation ratio difference, pressure coefficient difference between definite each single sand body, closes and adopt the superimposed number of plies of single sand body, superimposed thickness, the reasonable daily fluid production rate of straight well.
4. a kind of complex fault block ligh-oil reservoir hierarchical-development method as claimed in claim 1, it is characterized in that: described in S4, determine that each single sand body Remaining Oil Distribution and residual recoverable reserves size are concrete by each single sand body development effectiveness is evaluated, implement each single sand body reserves, accumulation extraction situation, current production capacity, pressure, and then portray remaining oil distribution situation and residual recoverable reserves size in each single sand body plane.
5. a kind of complex fault block ligh-oil reservoir hierarchical-development method as claimed in claim 1, is characterized in that: described in S3, each single sand body is carried out to reservoir property evaluation and comprise definite degree of porosity, permeability, oil saturation, shale content, pressure size; Described implementing every interbed distribution situation, physical property characteristic is specially and determines each distribution, varied in thickness situation and degree of porosity thereof, permeability in interlayer plane.
6. a kind of complex fault block ligh-oil reservoir hierarchical-development method as claimed in claim 1, is characterized in that: described in S2, realize fine geology layering specifically by under reference lamina control, according to the cycle of sedimentation, by subdivision of reservoir to sandstone group; According to resistance, the return feature of induction curve, in conjunction with sedimentary rhythm, described sandstone group is segmented to single sand body again.
7. a kind of complex fault block ligh-oil reservoir hierarchical-development method as claimed in claim 1, it is characterized in that: described in S1, definite oil reservoir to be developed is constructed specifically by utilizing artificial synthetic seismogram, implement each sandstone group top bottom interface with simultaneously, three dimensional seismic data is proofreaied and correct, in conjunction with three dimensional seismic data, realized well shake combination, each each well sandstone group end, top, is projected on 3-D seismics, according to 3-D seismic interpretation response situation, depict Cross-well fault position, implement oil reservoir structure; At the bottom of described definite limit water energy size specifically by elasticity drive, elasticity-Bian bottom water drive reservoir matter balance equation formula calculates elasticity productive rate, water influx, water oil volume ratio.
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| C06 | Publication | ||
| PB01 | Publication | ||
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