CN109162682B - A kind of fine layered water injection method of extra-low-permeability reservoir - Google Patents
A kind of fine layered water injection method of extra-low-permeability reservoir Download PDFInfo
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- 238000002347 injection Methods 0.000 title claims abstract description 34
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000011084 recovery Methods 0.000 claims abstract description 19
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- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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Abstract
The invention discloses a kind of fine layered water injection methods of extra-low-permeability reservoir comprising following steps: S1, the geologic information for collecting target area analyze geologic feature；S2, the geologic feature based on target area analyze target area water flooding recovery otherness feature；S3, according to target area water flooding recovery otherness feature, target area is finely layered, realizes fine water filling, finally to substratum water filling Policy optimization adjustment and rational allocation period.Step S3 in turn includes the following steps: reservoir fine comparison divides, segments flow unit, determines that dispensing standard, Fine Layers note adopt corresponding, subdivision flooding unit, substratum water filling Policy optimization adjustment and rational allocation period.The practice and exploration for the key technologies such as the present invention is compared by reservoir elaborate division, subdivision flow unit, establishes dispensing standard, Fine Layers note adopts corresponding, subdivision flooding unit and substratum technical policy is optimized and revised, solve the problems, such as that ultra-low penetration Complex Reservoir is developed.
Description
Technical field
The invention belongs to oil-gas reservoir production technique field, in particular to a kind of fine layering suitable for extra-low-permeability reservoir
Water-filling method.
Background technique
Low-permeability oil deposit is the lower oil reservoir of matrix permeability, and low-permeability oil deposit is an opposite concept, is not had in the world
There are the standard and boundary of unified fixation, delimited according to country variant, the resource situation of different times and condition of technology and economy,
Therefore, parameters change greatly.According to China's production practices and theoretical research, according to the size of oil reservoir mean permeability, into
Low permeability reservoir is divided into three classes by one step: general low permeability reservoir, ultra-low permeability reservoir, super-low permeability reservoir.Ultra-low penetration
Reservoir, which seeps, has saturating rate low, and stratum is fine and close, the heterogeneous strong, geology characteristics such as pore throat is small, physical property is poor, filtrational resistance is big.
As becoming increasingly conspicuous for world oil imbalance between supply and demand is gradually deficient with high-quality petroleum resources, the fine and close oil money of Oil in Super-low Permeability
The exploitation in source has become the new issue of China Petroleum development.Ordos Basin Triassic Yanchang Formation stratum is mainly triangle
Continent sedimentary system, reservoir lithology are landwaste arkose, arkose, feldspar rock-fragment sandstone, hybrid sandstone and rock-fragment sandstone, storage
Layer porosity 9.0~13.7%, 0.03~1.5mD of permeability are net pay zone, oil-water common-layer, no edge-bottom water, development lithology oil
Hiding.
For Oil in Super-low Permeability multilayer system complex reservoir, oil reservoir quantity is more, and longitudinal span is big, and cross directional variations are fast, sand shale
Alternating layers, oil water relation are complicated, fracture development, and waterflood front is complicated, and plane during waterflooding extraction, interlayer, contradiction is relatively prominent in layer
Out, such oil reservoir is more rare at home and abroad.It explores and investigates by early period, if generally developing or adopting using primary deployment
Exploitation is adopted with closing note and closing, single layer is necessarily will cause and advances by leaps and bounds obvious with tonguing phenomenon, lead to inject water being longitudinally propelling unevenness, reservoir moves
Low with degree, later period adjustment difficulty is big, and ultimate recovery is low.
Summary of the invention
The object of the present invention is to provide a kind of fine layered water injection methods of extra-low-permeability reservoir, are improved and are stored up by multi-zone flow regulating
The water drive swept volume of layer alleviates longitudinal upper heterogeneity contradiction, so as to improve waterflooding effect.
To achieve the goals above and further advantage, the fine layered water injection method of extra-low-permeability reservoir provided by the invention,
Include the following steps:
S1, the geologic information for collecting target area analyze geologic feature；Geologic information specifically includes oil reservoir and is averaged buried depth, oil
Layer average thickness, average pore, permeability, pressure coefficient, saturation pressure and reserves abundance.
S2, analysis target area water flooding recovery otherness feature, analyze target area water flooding recovery otherness feature, determine subdivision
The necessity that layer finely fills the water；Target area water flooding recovery otherness includes reservoir properties difference, pressure system difference, water drive reserves
Development degree difference.Wherein, reservoir properties difference includes reservoir permeability difference and porosity difference；Pressure system difference includes
Reservoir pressure difference of coefficients, barometric gradient difference, original formation pressure difference, saturation pressure difference；Water drive reserves development degree
Difference is that the production profile material computation of the intake profile of all test wells and whole test oil wells obtains per year, directly anti-
Reflect the waterflooding effect of waterflooding reservoir.The calculation formula of the water drive reserves development degree is as follows:
In formula: M is water drive reserves development degree；NgFor oil in place, m3；NdFor water drive mining-employed reserves, m3。
S3, the reservoir for needing finely to be layered finely is layered, then carries out fine water filling, political affairs finally is filled the water to substratum
Plan is optimized and revised and the rational allocation period.Step S3 is specifically included:
S31, reservoir fine comparison divide: according to three principles of reservoir division, reference lamina Controlling principle, offset well track principle
With formation thickness principle, major oil reservoir is subdivided into several substratums；On the basis of detail stratigraphic division, carries out sand body and is connected to Journal of Sex Research,
Grasp each substratum sand body plane and Vertical Distribution Characteristics.
S32, subdivision flow unit: it is carried out on deposition hierarchical basis to each substratum, according to petrophysics property parameter pair
Reservoir is classified, and I, II, III three classes flow unit is segmented out, and the infiltration of each substratum is judged based on the flow unit criteria for classifying
Stream ability preserves transitivity, selects the main layer of oil reservoir group；The petrophysics property parameter includes thickness, effective thickness, hole
Porosity, permeability, oil saturation, energy storage coefficient, seepage coefficient.
S33, it determines dispensing standard: blockette dispensing standard being carried out according to block geologic sedimentation feature and carries out construction and later period
Detection carries out interlayer dispensing for the multilayer build-up area in block, improves longitudinal interlayer reservoir development degree；For single hair
The reservoir region educated carries out dispensing in layer, improves water-flooding performance in layer.
S34, Fine Layers note adopt correspondence: the Distribution Pattern of clearly each substratum sand body in the plane surrounds injection-production well host
It is lateral to carry out sand body connection research, numerical simulation achievement, constantly amendment understanding are sufficiently used, determines each small layer plane connection feelings
Condition.
S35, subdivision flooding unit: in conjunction with flow unit division result early period, comprehensively consider seepage flow characteristics difference and ground
It is laminated the development features difference of force parameter, aqueous parameter, to research area's segmented block, further refines flooding unit.
S36, substratum water filling Policy optimization adjustment and rational allocation period.
Preferably, in the step S33, for the multilayer build-up area in block, two layers or three layers of development or more interlayer
Dispensing improves longitudinal interlayer reservoir development degree；For the reservoir region of single development, carry out two layers or three layer by layer in dispensing, mention
Water-flooding performance in high level.
Preferably, the step S34 specifically: using single injection-production well group as unit, combing each substratum of producing well is employed,
It determines in single injection-production well group and mainly employs substratum, be connected to situation in conjunction with each small layer plane sand body, determine that 2~3 water fillings correspond to
Substratum.
Preferably, the step S36 specifically: by plane divide flooding unit, it is longitudinal shunt moving cell based on, adhere to
" I class controls, II class is mild, III class is reinforced " principle, refinement note are adopted adjustment, for reservoir longitudinal direction physical difference, are advanced optimized
Each substratum water injection intensity reduces dispensing well interlayer contradiction.
Compared with prior art, the invention has the following advantages:
Employ etc. that there are notable differences for the reservoir properties of target block, pressure system, water injection pressure and water drive
Situation, the present invention develop the fine water-filling method of subdivision of reservoir.Fine separate zone waterflooding technology is flowed by reservoir elaborate division comparison, subdivision
Moving cell, established dispensing standard, Fine Layers note adopt correspondence, segment flooding unit and the keys such as substratum technical policy is optimized and revised
The practice and exploration of technology improve the water drive swept volume of reservoir, alleviate longitudinal upper heterogeneity contradiction, so as to improve water drive effect
Fruit.Solve the problems, such as that ultra-low penetration Complex Reservoir is developed.
The fine separate zone waterflooding technology of ultra-low penetration Complex Reservoir oil reservoir of exploiting potentialities needs Geological Engineering and petroleum production engineering
In conjunction with the shadow to development effectiveness such as Geologic modeling, depositional environment, development degree, effective thickness, permeability grade including block
It rings, to solve the contradiction between ultra-low penetration Complex Reservoir and Efficient Development.It was verified that ultra-low penetration Complex Reservoir is hard
It holds subdivision of reservoir finely to fill the water, the interim preferable development effectiveness of acquirement, provides reference warp for the Efficient Development of similar oil reservoir
It tests.
Further advantage, target and feature of the invention will be partially reflected by the following instructions, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Detailed description of the invention
Each flow unit classification of Fig. 1, certain oil field A block Main Reservoirs and sand body density histogram.
Fig. 2, certain oil field A block flooding unit divide schematic diagram.
Fig. 3, different flow unit multi-zone flow regulating optimization figures.
Fig. 4, certain oil field A block rational allocation period and substratum injection allocation qualification rate curve.
Fig. 5, certain oil field A block block well pattern Predicting The Recovery Efficiency figure.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings, to enable those skilled in the art referring to specification text
Word can be implemented accordingly.
Using certain oil field A block as research object, using the fine layered water injection method of extra-low-permeability reservoir of the invention into
Row water flooding recovery.The width that oil field A block is located at the development of Ordos Basin northern Shensi slope middle section western part delays western inclined slope, constructs
Mean inclination is less than 1 °, 6.0~7.0m of every km gradient.For Oil in Super-low Permeability multilayer system complex reservoir, oil field A block oil
Layer number is more, and longitudinal span is big, and cross directional variations are fast, sand-mud interbed, and oil water relation is complicated, fracture development, and waterflood front is complicated,
Plane during waterflooding extraction, interlayer, contradiction is more prominent in layer, such oil reservoir is more rare at home and abroad, once public by U.S. CE R
Department is assessed as the oil field of no Development volue.Investigation is explored by early period, if using once deployment, it is general to develop or using conjunction
Note close adopt exploitation, necessarily will cause single layer advance by leaps and bounds it is obvious with tonguing phenomenon, cause injection water be longitudinally propelling unevenness, reservoir employs journey
Spend low, later period adjustment difficulty is big, and ultimate recovery is low.Oil field A block is long 4+5, long 6 ultra-low penetrations overlap complicated sandstone area
Block, reservoir heterogeneity is strong, longitudinal overlapping development series of strata are more, lateral oil reservoir variation fastly, due to the inhomogeneity of each series of strata of oil reservoir,
Cause each layer water absorbing capacity not identical, faces development contradiction outstanding in the water filling interlayer, layer that multilayer employs.To realize such oil
Tibetan Scripture Ji Efficient Development in the technical foundation of known layered exploitation, has considered regional specific characteristics, has formulated since initial stage of development
A series of fine seperated layer water injection development technique.Specific steps are as follows:
The first step, the geologic information for collecting target area analyze geologic feature
Gulf microfacies between oil field A block is located at major developmental distributary channel and shunts, to extend group leader 4+5~length 6
Section oil reservoir group ultra-low penetration sandstone is the most typical.Geologic feature main conditions are shown in Table 1, aggregate performance thin, physical property for reservoir thickness
Difference, reservoir pressure coefficient are low, single layer average thickness 11.7m, permeability 0.82 × 10-3μm2, porosity about 11.9%, pressure system
Number 0.78 belongs to the typical ultra-low penetration " three-lows " oil reservoir of Ordos Basin.In addition, the resource plane has a very wide distribution, it is longitudinal
Overlapping development substratum is more, and longitudinal span is big, and cross directional variations are fast, and sand-mud interbed, heterogeneity is strong, and interlayer permeability is very poor to be reached
640, layer intrinsic permeability is very poor to reach 989, at hiding mainly by lithologic character controlling.It can be seen that distribution according to distribution well location cross sectional view
Oil reservoir is continuous but not self-contained, is influenced by height above sea level.The development of intrinsic fracture is so that initial stage transformation fracture hole directionality assurance difficulty, causes
In-place oil flow driving is difficult.
1. oil field A block Main Reservoirs physical property situation statistical form of table
Second step, analysis target area water flooding recovery otherness feature, determine the necessity that subdivision of reservoir finely fills the water
Before formulating water flooding recovery scheme, needs to do difference analysis to the factor for influencing construction, avoid risk.Target
Area's water flooding recovery otherness includes reservoir properties difference, pressure system difference, water drive reserves development degree difference.
(1) reservoir properties difference
The long 6 stratum single layer production capacity of 4+5~length of Ordos Basin is the letter of reservoir properties (including permeability, porosity)
Number, physical property quality direct relation oil well productivity and stable yields effect.Reservoir properties difference mainly by reservoir lithology and diagenetic process not
With caused by, there are interlayer interferences in multilayer system develops for this difference, form interlayer contradiction.It, should meanwhile in the injecting process
Layer position sandstone's cementation matter is usually based on shale, and the difference of physical property causes water absorbing capacity between different series of strata different, water drive process
Middle flood front movement velocity is different, has been further exacerbated by interlayer contradiction.
The long 4+5- long 6 of Ordos Basin is mainly delta sedimentary system, and reservoir lithology is landwaste arkose, feldspar
Sandstone, feldspar rock-fragment sandstone, hybrid sandstone and rock-fragment sandstone, reservoir porosity 9.0~13.7%, 0.03~1.5mD of permeability,
For net pay zone, oil-water common-layer, no edge-bottom water develops lithological pool.Above-mentioned oil reservoir can be further subdivided into 6 substratums (long 4 again
+51 1, long 4+51 2, long 4+52 1, long 4+52 2, it is long by 61 1, it is long by 61 2), reservoir heterogeneity is strong, and permeability is very poor between substratum reaches
640, substratum internal penetration rate is very poor to reach 989, is heterogeneity-pole heterogeneous reservoir.
(2) pressure system difference
Pressure system is simply divided into the original pressure system in stratum and Mining Water Injection pressure system.The increase of Mining Water Injection pressure
Original strata pressure is destroyed, there are the stable yields that after suitable dynamic pressure difference ratio, just can guarantee producing well is even high for the two
It produces.
Ordos Basin Triassic system oil reservoir is all low pressure reservoirs (reservoir pressure coefficient 0.6-0.8), different reservoir pressure
System has differences on pressure coefficient, barometric gradient, original formation pressure, saturation pressure, this species diversity is to oil reservoir feed flow energy
There is certain influence in power.It is influenced by external recovery pressure, oil reservoir is in investment development process, different reservoir type, difference exploitation
Mode, different developing values, different development phases form different development behaviors, if classification zonal pressure difference is larger,
Commingling production, then low pressure layer is often not out or few fuel-displaced.
During reservoir water, layering allotment is only adjusted under an instantaneous pressure background, when pressure becomes
When change, the direct result that influences is exactly that layered waterflooding quantity changes, and water injection pressure transformation period than deploy next time when
Between want short more.By live great mass of data comparative analysis, 20% or more water injection well needs to be layered allotment, fills the water in this way
The error of amount, direct result are that injection water is caused to be advanced by leaps and bounds along high permeability formation or microcrack, lead to some oil wells water logging, thus shape
At remaining oil, aggravate interlayer contradiction.
Fine separate zone waterflooding technology needs research object using geology sub-layer, substratum as object, the overlapping exploitation of multilayer system oil reservoir.
With long 4+51, long 4+52With long 61For, the water injection rate, water injection pressure difference between each series of strata are big, are shown in Table 2, give oil-field flooding ground
Engineering design causes certain difficulty.
2. each substratum water injection parameter table of oil field A block of table
| Develop substratum | Long 4+51 | Long 4+52 | Long 61 |
| Individual well water injection rate (m3/d) | 15.0~25.0 | 20.0~25.0 | 25.0~30.0 |
| Well head pressure (MPa) | 8.0~12.0 | 10.0~13.0 | 12.0~15.0 |
(3) water drive reserves development degree difference
The substratum cross directional variations of multiple zone congruent region are very fast in the middle part of oil reservoir, and intraformational bed is more.Water drive reserves development degree
It is the intake profile of all test wells and all the production profile material computation of test oil well per year, directly reflection water filling is opened
The waterflooding effect of hair oil hiding.Initial stage of development, local injection-production relation is poor, there is " having note nothing to adopt ", " adopting without note ", water drive
Reserves controlling extent 84.5%, water drive reserves development degree 63.8%, initial stage natural depletion reach 25%, have seriously affected oil reservoir
Development effectiveness.Water drive reserves development degree calculation formula is as follows:
In formula: M is water drive reserves development degree；NgFor oil in place, m3；NdFor water drive mining-employed reserves, m3.It is adopted with showwing loving care for
The adjustment of well pattern constantly improve with injection-production relation, oil in place NgIt reduces as time goes by, water drive reserves development degree
It is improved with the intensification of Exploitation degree, value is bigger, illustrates that the waterflooding development effect of water-drive pool is better.Water drive reserves are employed
The evaluation criterion of degree is shown in Table 3.
3. water drive reserves development degree evaluation criterion table of table
| Water drive reserves development degree | Evaluation criterion |
| > 80% | It is good |
| 75%-80% | Preferably |
| 70%-75% | It is medium |
| 65%-70% | It is poor |
| < 65% | Difference |
With the adjustment of flooding pattern constantly improve with injection-production relation, reservoir water drive reserves controlling extent and development degree
It has and greatly improves.But dispensing well is also frequently present of the problem of water suction differs greatly on longitudinal direction, causes to store up on longitudinal direction
Amount employs unbalanced situation.In response to this problem, it is necessary to carry out subdivision of reservoir and finely fill the water work, it is rationally all to increase layering allotment
The research of phase improves dispensing well interlayer section water swelling elastomer, alleviates the unbalanced situation of reserves exploitation on section, to improve water
Oil displacement efficiency.
The allotment of layering in nearly 3 years and dispensing well intake profile test case are counted, 21% allotment is invalid as the result is shown, exists
Single layer surpasses the problem of shorting, so that corresponding oil well be caused the problems such as single layer water logging, interlayer production liquid difference is big occur.Have for substratum
Adopt no note, it is necessary to carry out subdivision of reservoir water filling, improve oil development effect；There is note without well is adopted for substratum, earlier water filling is cultivated
Energy, later period implement non-active layers measure and tap the latent power.
Third step is finely layered the reservoir for needing finely to be layered, and then carries out fine water filling, finally infuses to substratum
Water policy is optimized and revised and the rational allocation period.Specifically include following operating procedure:
(1) reservoir fine comparison divides
Fine Reservoir Division and contrast follows three principles: 1. reference lamina controls；2. offset well is tracked；3. the basic phase of formation thickness
Approximately principle.Block indicia layer is generally developed in the middle part of long 4+5 oil reservoir group, is a set of coal measure strata, the development of thin layer seam, thickness
5~10m, electrical property feature show as the zigzag high time difference, high resistance, and spontaneous potential curve amplitude is also smaller, with long 4+51With long 4
+52Sandstone is connected, and is the main foundation for dividing this head of district 4+5 oil reservoir group.Meanwhile by offset well tracking and thickness phase approximately principle,
By Y214 major oil reservoir group leader 4+52, it is long by 61It is further subdivided into long 61 2, it is long by 61 1, long 4+52 2, long 4+52 1Four substratums.Four
Substratum formation thickness is at 18 meters~30 meters or so, wherein long 4+52 1Substratum is most thick, 25 meters average, and long 61 1Substratum is most thin, average
16.5 meters, long 4+52 2With long 61 2Substratum average thickness is all at 20 meters or so.Formation thickness in the longitudinal direction, lateral overall variation not
Greatly.
On the basis of detail stratigraphic division, carries out sand body and is connected to Journal of Sex Research, grasp each substratum sand body plane and Vertical Distribution Characteristics,
Long 4+52, it is long by 61Small thickness distribution is stablized, and 5~15 meters of compartment thickness, has interlayer dispensing basis.Long 4+52 2Substratum development 2
A interlayer, distribution are stablized, and 3 long 4+5 of single sand body are further divided into2 2-1, long 4+52 2-2, long 4+52 2-3.Long 61 2Substratum development 3
A interlayer, distribution is more stable, is further divided into 4 single sand bodies.To each substratum of oil reservoir group in this way from plane and on section
Deep understanding has been carried out, has been laid a good foundation for fine seperated layer water injection implementation.
(2) flow unit is segmented
Long 4+5, Chang6 oil layer formation are carried out on deposition hierarchical basis, reservoir is divided according to petrophysics property parameter
Class evaluation, segments out I, II, III three classes flow unit (being shown in Table 4).
Statistics discovery long 61 2Oil reservoir sand body density is maximum, and I class, II class flow unit distribution proportion are maximum, respectively reaches
36%, 45%.Its vice-minister 4+52 1The distribution of I class flow unit of oil reservoir is larger, reaches 19%, but sand body density is relatively minimal, accounts for
37%.Long 4+52 2Oil reservoir and long 61 1Oil reservoir sand body density is relatively large, and I class flow unit proportion is smaller, and respectively 9%
With 8%, II class flow unit proportion is also relatively fewer, and respectively 39% and 41%.Statistics indicate that long 61 2Oil reservoir seepage flow energy
Power and preserve most strong, it is the main layer of oil reservoir group that physical property is best, followed by long 4+52 1Oil reservoir, long 4+52 2Oil reservoir and long 61 1Oil reservoir
Percolation ability and preserve general, physical property is relatively general (as shown in Figure 1).
The 4. oil field A block flow unit criteria for classifying of table
(3) dispensing standard is established
On the basis of reservoir fine compares and divides and segment flow unit, for multilayer build-up area in the middle part of block, mainly
Two layers or three layers of development or more interlayer dispensing improves longitudinal interlayer reservoir development degree.For east long 61 2, western long 4+52 2
The reservoir region of relatively single development, carry out two layers or three layer by layer in dispensing, improve layer in water-flooding performance.Specific dispensing standard
It is shown in Table 5.
The long 4+5 of table 5.A block, Chang-6 oil reservoir dispensing standard divide
(4) Fine Layers note adopts correspondence
During implementing dispensing, emphasis reinforces Fine Layers note and adopts corresponding research.Firstly, establish and improve long 4+5,
The longitudinally superimposed model of four substratums of Chang6 oil layer formation, the Distribution Pattern of tentatively clearly each substratum sand body in the plane are each substratum
It employs and seperated layer water injection provides foundation.
Secondly, around flooding pattern main side to sand body connection research is carried out, sufficiently using Numerical-Mode centered on water injection well
Quasi- achievement, constantly amendment understanding, determine each small layer plane connection situation.
Finally, combing each substratum of producing well is employed using single injection-production well group as unit, determine main in single injection-production well group
Substratum is employed, is connected to situation in conjunction with each small layer plane sand body, the corresponding substratum of 2-3 water filling is determined, evades in separated injection and combined recovery as far as possible
Common " oil is to more water ", " water infuses multilayer " phenomenon, improves water-injection efficiency.
(5) flooding unit is segmented
In the management of later period reservoir water, flow unit early period division result is sufficiently combined, seepage flow characteristics difference is comprehensively considered,
And the development features difference such as strata pressure, aqueous further refines flooding unit (such as Fig. 2 institute to research area's segmented block
Show).Reality is developed in conjunction with each unit, sets about from strata pressure variation, single well productivity variation, the water breakthrough degree etc. that takes effect, fills
Partite transport dynamic monitoring achievement constantly adjusts and optimizes each development of injection-production unit developing value.
(6) adjustment of substratum water filling Policy optimization and rational allocation period
By plane divide flooding unit, it is longitudinal shunt moving cell based on, adhere to that " control of I class, II class are mild, III class adds
By force ", refinement note adopts adjustment.For reservoir longitudinal direction physical difference, each substratum water injection intensity is advanced optimized, reduces dispensing well interlayer
Contradiction (such as Fig. 3).
During reservoir water, layering allotment is only adjusted under an instantaneous pressure background, when pressure becomes
When change, the direct result that influences is exactly that layered waterflooding quantity changes, and water injection pressure transformation period than deploy next time when
Between want short more, lead to dispense the decline of well substratum injection allocation qualification rate, direct result is to lead to inject water along high permeability formation or micro-
Crack is advanced by leaps and bounds, and some oil wells water logging is caused, and interlayer contradiction is further exacerbated by.
By carrying out Mathematical Statistics Analysis to the data of allotment in block nearly three years and intake profile test, carry out rational allocation
Oil reservoir dispatch cycle is optimized in cycle studies, determines research area's rational allocation period≤72 day (as shown in Figure 4).
The effect that above-mentioned Application Example obtains: (1) water drive situation is good, and oil well takes effect degree height.By adhering to subdivision of reservoir
Fine water filling, integrally dispensing rate reaches 59.6% to oil reservoir, and water drive situation improves, and water drive reserves controlling extent reaches 94.0%, moves
Reach 72.8% with degree, pressure keeps level 93.7%, and oil reservoir natural depletion and water_bearing escalating rate continue to decline, and nearly 3 years certainly
So successively decreasing within control 10%, water_bearing escalating rate 0.6%, from the point of view of oil well takes effect situation, integrally the degree of taking effect reaches 81.6%,
Averagely take effect the period 16.6 months, and from the point of view of the type that takes effect, taken effect with I class based on, whole development situation is preferable.(2) oily
It is high to hide ultimate recovery, whole development effect is good.A block investment exploitation 10 years, add up to recover the oil 101.5 ten thousand tons, recovery ratio reaches
20%, realize that efficient stable yields purpose, a well pattern recovery ratio are up to 22% or more (as shown in Figure 5).The success of A block is opened
Hair, provides experience for reference for the fine waterflooding extraction of Oil in Super-low Permeability oil reservoir subdivision of reservoir.
In conclusion longitudinally overlapping development series of strata are more for above-mentioned oil field A block, reservoir properties are poor, belong to Ordos Basin
Typical ultra-low penetration Complex Blocks.A block reservoir physical property, pressure system, water injection pressure and water drive employ etc. that there are bright
Significant difference is different, it is necessary to develop the fine waterflooding extraction of subdivision of reservoir.By reservoir elaborate division comparison, subdivision flow unit, establishes and divide
The practices of key technologies such as note standard, Fine Layers note adopt corresponding, subdivision flooding unit and substratum technical policy is optimized and revised with
It explores, solves the problems, such as that ultra-low penetration Complex Reservoir is developed.Ultra-low penetration Complex Reservoir adheres to that subdivision of reservoir finely fills the water,
The interim preferable development effectiveness of acquirement, the Efficient Development for similar oil reservoir provide experience for reference.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With.It can be applied to various suitable the field of the invention completely.It for those skilled in the art, can be easily
Realize other modification.Therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein.
Claims (4)
1. a kind of fine layered water injection method of extra-low-permeability reservoir, which comprises the following steps:
S1, the geologic information for collecting target area, analyze geologic feature, and geologic information includes that be averaged buried depth, oil reservoir of oil reservoir is average thick
Degree, average pore, permeability, pressure coefficient, saturation pressure and reserves abundance；
S2, analysis target area water flooding recovery otherness feature, determine the necessity that subdivision of reservoir finely fills the water, target area water flooding recovery
Otherness includes reservoir properties difference, pressure system difference, water drive reserves development degree difference；Reservoir properties difference includes reservoir
Permeability contrast and porosity difference；Pressure system difference includes reservoir pressure difference of coefficients, barometric gradient difference, prime stratum
Pressure gap, saturation pressure difference；Water drive reserves development degree difference is intake profiles of all test wells and complete per year
The production profile material computation of portion's test oil well obtains, and directly reflects the waterflooding effect of waterflooding reservoir；The water drive reserves
The calculation formula of development degree is as follows:
,
In formula:For water drive reserves development degree；For oil in place, m3；For water drive mining-employed reserves, m3；
S3, to it is necessary to the reservoirs being finely layered finely to be layered, then carry out fine water filling, policy finally filled the water to substratum
It optimizes and revises and the rational allocation period；Specific step is as follows:
S31, reservoir fine comparison divide: according to three principle of reservoir division, reference lamina Controlling principle, offset well tracking principle and ground
Major oil reservoir is subdivided into several substratums by thickness degree principle, on the basis of detail stratigraphic division, is carried out sand body and is connected to Journal of Sex Research, grasp
Each substratum sand body plane and Vertical Distribution Characteristics；
S32, subdivision flow unit: it is carried out on deposition hierarchical basis to each substratum, according to petrophysics property parameter to reservoir
Classify, segment out I, II, III three classes flow unit, and judges the seepage flow energy of each substratum based on the flow unit criteria for classifying
Power preserves transitivity, screens the main layer of oil-yielding stratum group；The petrophysics property parameter includes thickness, effective thickness, hole
Degree, permeability, oil saturation, energy storage coefficient, seepage coefficient；
S33, it determines dispensing standard: blockette dispensing standard being carried out according to block geologic sedimentation feature and carries out construction and later period inspection
It surveys, for the multilayer build-up area in block, carries out interlayer dispensing, improve longitudinal interlayer reservoir development degree；For single development
Reservoir region, carry out layer in dispensing, improve layer in water-flooding performance；
S34, Fine Layers note adopts correspondence: the Distribution Pattern of clearly each substratum sand body in the plane, around flooding pattern main side to
Carry out sand body connection research, sufficiently uses numerical simulation achievement, constantly amendment understanding, determine each small layer plane connection situation；
S35, subdivision flooding unit: in conjunction with flow unit division result early period, comprehensively consider seepage flow characteristics difference and ground lamination
The development features difference of force parameter, aqueous parameter further refines flooding unit to research area's segmented block；
S36, substratum water filling Policy optimization adjustment and rational allocation period.
2. the fine layered water injection method of extra-low-permeability reservoir as described in claim 1, which is characterized in that in the step S33,
For the multilayer build-up area in block, two layers or three layers of development or more interlayer dispensing improves longitudinal interlayer reservoir development degree；Needle
To the reservoir region of single development, carry out two layers or three layer by layer in dispensing, improve water-flooding performance in layer.
3. the fine layered water injection method of extra-low-permeability reservoir as claimed in claim 2, which is characterized in that the step S34 tool
Body are as follows: using single injection-production well group as unit, combing each substratum of producing well employ, determine mainly employed in single injection-production well group it is small
Layer is connected to situation in conjunction with each small layer plane sand body, determines the corresponding substratum of 2~3 water fillings.
4. the fine layered water injection method of extra-low-permeability reservoir as claimed in claim 3, which is characterized in that the step S36 tool
Body are as follows: by plane divide flooding unit, it is longitudinal shunt moving cell based on, adhere to the original that the control of I class, II class is mild, III class is reinforced
Then, refinement note adopts adjustment, for reservoir longitudinal direction physical difference, advanced optimizes each substratum water injection intensity, reduces dispensing well interlayer
Contradiction.
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| CN110656935A (en) * | 2019-10-26 | 2020-01-07 | 延长油田股份有限公司杏子川采油厂 | Matrix statistical analysis method for evaluating extraction degree of low-permeability multi-layer system oil reservoir |
| CN110838175B (en) * | 2019-11-07 | 2023-05-09 | 成都北方石油勘探开发技术有限公司 | Geological model building method for gas injection development oil reservoir |
| CN113137212A (en) * | 2020-01-17 | 2021-07-20 | 中国石油天然气股份有限公司 | Multi-layer heterogeneous oil reservoir water injection method |
| CN111271032B (en) * | 2020-03-16 | 2022-04-26 | 常州大学 | Well pattern balanced injection-production and supporting guarantee method in high water-cut stage |
| CN111350498B (en) * | 2020-04-13 | 2022-05-03 | 西南石油大学 | Method for describing weak flooding distribution characteristics of medium-high permeability oil reservoir in ultra-high water content development period |
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