CN104912538A - Method and device for determining boundary discharge of oil-field blocks - Google Patents
Method and device for determining boundary discharge of oil-field blocks Download PDFInfo
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Abstract
The invention provides a method and a device for determining boundary discharge of oil-field blocks. The method comprises the steps as follows: determining peripheral blocks which are communicated with the researched blocks according to reservoir production dynamic data of an oil field and geological research results which are acquired in advance; determining theoretical drainage areas of all blocks according to the reservoir production dynamic data; and determining the boundary discharge of the researched blocks according to the cumulative oil output of all blocks, actual areas of all the blocks in the reservoir production dynamic data of the oil field. According to the method and the device, the boundary inflow and the boundary outflow of the blocks in stages are calculated by reference to production performance of oil wells around the blocks and reservoir pressure testing results, so that history matching basis is provided for fine reservoir numerical simulation of the blocks.
Description
Technical field
The present invention relates to oil exploration technology, is a kind of field area block boundary flow defining method and device concretely.
Background technology
Along with the progress of oil field development technology and the raising of the reservoir geology level of understanding, well spacing density is increasing, also more and more higher to the requirement of meticulous pool description technology and reservoir numerical simulation, therefore the Careful Numerical Simulation of block models is also increasing with the demand of local conceptual model.But reservoir engineer is when carrying out block numerical simulation, one of larger difficulty run into is exactly the determination of fringe conditions.Because block models reserves are little, data are relatively less, and unlike whole district's model, have the precision of more data point Controlling model, thus uncertainty is larger.The difference of fringe conditions can produce a very large impact to model result with to the understanding of block, therefore becomes particularly important to the research of block models fringe conditions.
In prior art, the processing method of reservoir engineer to this kind of situation is not established fringe conditions or arrange simple water body, this processing method often cannot be tackled patch periphery well production status stage and significantly change and affect dynamically border inflow and outflow, thus cannot meet the requirement of block history matching for production.Part business software can go out border flox condition by whole district's numerical simulation calculation, then this fringe conditions is used for block numerical simulation calculation.Although this method precision is high, owing to needing to set up with whole district's numerical model of block models Accuracy Matching and carrying out history matching, especially for often relating to millions of even up to ten million grid during large oilfield, workload is huge, poor operability.
Summary of the invention
For solving the fringe conditions computational problem faced in block reservoir numerical simulation, embodiments providing a kind of field area block boundary flow defining method, comprising:
Production performance data according to oil field are determined and the periphery block that research block is communicated with the geological research result obtained in advance;
The theoretical drainage area of each block is determined according to described Production performance data;
The boundary flux studying block is determined according to the tired produce oil of each block in the Production performance data in described oil field, the real area of each block.
Meanwhile, present invention also offers a kind of field area block boundary flow determining device, comprising:
Be communicated with block determination module, determine and the periphery block that research block is communicated with the geological research result obtained in advance for the Production performance data according to oil field;
Theoretical drainage area determination module, for determining the theoretical drainage area of each block according to the Production performance data in oil field;
Flow determination module, for determining according to the tired produce oil of each block in the Production performance data in described oil field, the real area of each block the boundary flux studying block.
For above and other object of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and coordinate institute's accompanying drawings, be described in detail below.
The present invention proposes a kind of reservoir engineering material balance principle of using and go out the scheme of block border inflow and outflow amount stage by stage in conjunction with block perimeter well Production development and reservoir pressure test result calculations, and demonstrated the reliability of result of calculation by reservoir numerical simulation, for block oil reservoir Careful Numerical Simulation provides history matching foundation.
For above and other object of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and coordinate institute's accompanying drawings, be described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the flow chart of a kind of field area provided by the invention block boundary flow defining method;
Fig. 2 be border flowing calculate in drainage area and bounds schematic diagram;
Fig. 3 is the block diagram of a kind of field area provided by the invention block boundary flow determining device;
Fig. 4 is that in the embodiment of the present invention, C block theory calculate adds up boundary flux and numerical simulation adds up boundary flux;
Fig. 5 is that in the embodiment of the present invention, C block theory calculate adds up boundary flux and numerical simulation adds up boundary flux;
Fig. 6-16 is thick, the substratum sedimentary facies of block sand and cumulative production bubble figure in the embodiment of the present invention;
Figure 17 is zones of different production curve in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, the invention provides a kind of field area block boundary flow defining method, method comprises:
Step S101, determines and the periphery block that research block is communicated with according to Production performance data and the geological research result obtained in advance in oil field;
Step S102, determines the theoretical drainage area of each block according to described Production performance data;
Step S103, determines according to the tired produce oil of each block in the Production performance data in described oil field, the real area of each block the boundary flux studying block.
Wherein, above-mentioned Production performance data also comprise: the reserves of each block, the tired oil production in oil field, the overall tired product bubble figure of the thick and oil reservoir of the average sand of the average pressure drop of each block, the average pore of each block, each block.
For solving the fringe conditions computational problem faced in block reservoir numerical simulation, the present invention adopts with the following method:
Because in oil reservoir research, regional physical property has different, first research block and perimeter zone are divided into different independent draining districts, the Mass Balance Analysis in draining district is carried out on the basis in independent draining district and calculates theoretical drainage area, become a mandarin according to the boundary current comparing to determine current block of theoretical drainage area and actual block area and have troubles, again in conjunction with the inflow and outflow situation of periphery block, finally determine the border flow condition on border between target block and each block of periphery and do fringe conditions calculating.
In the embodiment of the present invention, determine that the periphery block be communicated with research block comprises according to Production performance data and the geological research result obtained in advance in oil field:
Produce each layer substratum sand-body distribution and deposition figure in bubble figure and geological research result according to the oil reservoir entirety in Production performance data is tired, determine and the periphery block that research block is communicated with.
In the embodiment of the present invention, theoretical drainage area calculates:
Relate to numerous uncertain parameter because fringe conditions calculates, therefore certain simplify processes is done to correlated condition.Assuming that research oil reservoir is homogeneous not uniform thickness oil reservoir, manufacturing process is not degassed, oil reservoir whole district external boundary supplies without water energy, suppose that the pressure balance district internal pressure distribution related to can be used as independent unified pressure body all in the lump and outside adjacent block does Exchange of material and energy simultaneously, think that formation rock and crude oil property keep stable within the stage relatively short sometime, the volume factor in matter balance equation and system compressibility remain unchanged.Under these conditions, the matter balance equation of undersaturated oil pool can be expressed as:
The matter balance equation in this oil reservoir certain region inner can be expressed as:
Inner at Homogeneous Reservoir, underground crude oil initial volume coefficient B oi, oil volume factor B
o, system compressibility Ct can think for unified value, therefore,
Again,
N
r: block reserves;
N
f: whole district's reserves;
Np
r: block tires out produce oil;
Np
f: produce oil is tired out in full oil field;
Δ p
r: block average pressure drop;
Δ p
f: full oil field average pressure drop;
A
d: theoretical drainage area;
φ: average pore;
H: average sand is thick.
The theoretical drainage area in stage end sometime of all producing wells in this region can be calculated according to above-mentioned formula.
In the embodiment of the present invention, the calculating of boundary flux:
If for certain region self, calculate the theoretical draining A of gained
darea is less than the real area A in this region
p, then the pressure drop that produced fluid brings in one's respective area in the ideal case can not have influence on the place beyond zone boundary; If calculate the theoretical drainage area A of gained
dbe greater than the real area A in this region
pso in region, oil reservoir is produced the Pressure Drop brought and will be had influence on place beyond region, also adjacent area fluid is namely needed from inflow one's respective area, border, supplement the pressure deficit of producing and causing, be assumed to the prerequisite of Homogeneous Reservoir at oil reservoir under, the outside oil reservoir area be used for required for this Pressure Drop supplementary just equals the difference of the theoretical drainage area of this block and block real area.
In general, if parameter choose correct pressure data are by real, then periphery block do not employ area (A in Fig. 2
pAregion) target block theory calculate and real area difference (A in Fig. 2 can be greater than
dAregion), now provide extra pressure to supplement by perimeter zone with the form of boundary flux, support the output in A block.
Be unified pressure body within supposing theoretical drainage area, so inner at theoretical drainage area, actual block area internal and outside reserves provide the pressure support ventilation of block cumulative production jointly, and its ratio equals this two-part reserves proportion.Because within producing well is all positioned at the area at actual block place, so the reserves of part tire out to block and produce the part that provides and will flow into actual block inside by boundary flux outside actual block area, and this flow can calculate.
A
d: theoretical drainage area;
A
p: actual area area.
The theoretical drainage area of block B is less than to the situation of actual block area, corresponding block Pressure Drop and tired output at that time, still some reserves is not used for supporting corresponding tired output, and the ratio that this part reserves accounts for its gross reserves is,
If periphery has multiple block and target block UNICOM, the contribution of different blocks to target block boundary flux then can be calculated according to proportionate relationship.
In addition, as shown in Figure 3, the present invention also provides a kind of field area block boundary flow determining device, comprising:
Be communicated with block determination module 301, determine and the periphery block that research block is communicated with the geological research result obtained in advance for the Production performance data according to oil field;
Theoretical drainage area determination module 302, for determining the theoretical drainage area of each block according to the Production performance data in oil field;
Flow determination module 303, for determining according to the tired produce oil of each block in the Production performance data in described oil field, the real area of each block the boundary flux studying block.
Invention compliance test result:
In order to verify that whether said method of the present invention is reasonable, whether result of calculation is reliable, relies on the reservoir numerical simulation model comprising all oil reservoir groups in full-fledged research region to carry out analog computation, track out the boundary flux in C block different boundary.The block relevant parameters such as the pressure reserves cumulative production extracted in model are for carrying out boundary flux theory calculate.Result shows, the accumulative border for block C flows into output, and theory calculate coincide the boundary current value that numerical model draws substantially.The boundary current value of 5 nodes of theory calculate agrees with the end value (Fig. 4) that numerical simulation calculation goes out, the boundary flux that theory calculate draws equals the average (Fig. 5) that numerical simulation calculation in the time period goes out boundary flux substantially, meets the demand of numerical simulation calculation.
Iraq Rumaila Field Upper Shale oil reservoir (Fig. 4) is transitional facies sandstone oil reservoir.Because early-stage Study lacks, fail to set up the high-precision numerical model of the whole district, research progress produces bubble figure according to oil reservoir entirety is tired, in conjunction with each layer substratum sand-body distribution and deposition phasor, determine possible region sand body connected relation, mark off the independent draining district scope for the block of fine analog and periphery thereof developing zone.The scope in draining district delimited and considered each substratum Distribution of Sedimentary Facies, suitably take into account different layers sandbody distribution difference.Because this block individual well under present condition splits the uncertainty of producing and remaining certain degree, considerable influence can be produced to subsequent calculations, therefore divide draining districts different in plane according to overall oil reservoir situation.Each layer matter balance equation and the dynamic drainage area of each layer is calculated on this basis.
It is the Rumaila Field Up Shale thick sedimentary facies of sandstone oil reservoir sand and tired output bubble figure that Fig. 6-16 is depicted as oil reservoir in the embodiment of the present invention, in figure, C block is dense well pattern block, considerable influence can be produced to the history matching of C block from the oil well production in north (N), east (E), (S) three directions, south in this block development process, in order to provide foundation to the history matching of C block, according to the method described above the boundary flux of different layers is calculated.
Figure 17 illustrates north, east, the trizonal output section in west, can find out, the production status of these blocks has the feature of interim fluctuations, and the production ratio that during different phase, block output section is formed also between different blocks also can change, and the change of this size and ratio is exactly the major influence factors whether channelling occurs between different blocks.Separately in conjunction with oil field different blocks pressure test history, choosing the time point having pressure test reliable results, is 5 sections by oil reservoir development divided stages, and segmentation calculates C block boundary inflow and outflow situation (table 1) of different phase.
Table 1 drainage area and block area table
When theoretical drainage area is greater than block real area time, show that the reserves within this region are difficult to support the tired output in current block under pressure, need the fluid of adjacent block in contemporaneity to flow into this block; When theoretical drainage area is less than block real area time, then representing these block reserves except meeting tired output corresponding to Pressure Drop in block still has surplus, can carry out pressure supplement periphery block.In both cases, for the former, by its cumulative production according to the proportionate relationship between drainage area and block real area, its tired output is divided into by this block reserves support and not by this block reserves support two parts; For the latter, also according to theoretical drainage area and actual block area ratio its reserves are divided into support Pressure Drop in this block and non-pressure release two parts of supporting this block to produce in theory.Because of the target block that C block in present case is research, in order to simplify calculating, do not consider the channelling between same North, the South block of East block.So when C block needs supplementary pressure, then according to the non-pressure release reserves proportion of theory of other three pieces, distribute the cumulative production that C block does not have reserves to support, thus try to achieve the boundary flux (table 2) on each border of block.
Table 2 boundary flux result of calculation (b/d)
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Apply specific embodiment in the present invention to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a field area block boundary flow defining method, is characterized in that, described method comprises:
Production performance data according to oil field are determined and the periphery block that research block is communicated with the geological research result obtained in advance;
The theoretical drainage area of each block is determined according to described Production performance data;
The boundary flux studying block is determined according to the tired produce oil of each block in the Production performance data in described oil field, the real area of each block.
2. field area as claimed in claim 1 block boundary flow defining method, it is characterized in that, described Production performance data also comprise: the reserves of each block, the tired oil production in oil field, the overall tired product bubble figure of the thick and oil reservoir of the average sand of the average pressure drop of each block, the average pore of each block, each block.
3. field area as claimed in claim 2 block boundary flow defining method, it is characterized in that, according to the Production performance data in oil field, described determines that the theoretical drainage area of each block comprises:
According to the reserves of each block, the tired oil production in oil field, the thick and formula (1) of the average sand of the average pressure drop of each block, the average pore of each block, each block determines the theoretical drainage area of each block, and formula (1) is:
Wherein, N
rfor block reserves;
N
ffor whole district's reserves;
Np
rfor block tires out produce oil;
Np
ffor produce oil is tired out in full oil field;
Δ p
rfor block average pressure drop;
Δ p
ffor full oil field average pressure drop;
A
dfor theoretical drainage area;
φ is average pore;
H is that average sand is thick;
Boi is crude oil initial volume coefficient.
4. field area as claimed in claim 3 block boundary flow defining method, it is characterized in that, described determine that the boundary flux studying block comprises according to the tired produce oil of each block in the oil reservoir creation data in oil field, the actual drainage area of each block: determine to study according to the tired produce oil of each block, the actual drainage area of each block the boundary flux that the boundary flux of block and formula (2) determine to study block, formula (2) is:
A
dfor theoretical drainage area;
A
pfor actual area area.
5. field area as claimed in claim 4 block boundary flow defining method, is characterized in that, with the geological research result obtained in advance, described determines that the periphery block be communicated with research block comprises according to the Production performance data in oil field:
Produce each layer substratum sand-body distribution and deposition figure in bubble figure and geological research result according to the oil reservoir entirety in Production performance data is tired, determine and the periphery block that research block is communicated with.
6. a field area block boundary flow determining device, is characterized in that, described device comprises:
Be communicated with block determination module, determine and the periphery block that research block is communicated with the geological research result obtained in advance for the Production performance data according to oil field;
Theoretical drainage area determination module, for determining the theoretical drainage area of each block according to the Production performance data in oil field;
Flow determination module, for determining according to the tired produce oil of each block in the Production performance data in described oil field, the real area of each block the boundary flux studying block.
7. field area as claimed in claim 6 block boundary flow determining device, it is characterized in that, described Production performance data also comprise: the reserves of each block, the tired oil production in oil field, and the average sand of the average pressure drop of each block, the average pore of each block and each block is thick.
8. field area as claimed in claim 7 block boundary flow determining device, it is characterized in that, described theoretical drainage area determination module is further according to the reserves of each block, the tired oil production in oil field, thick and the formula (1) of the average sand of the average pressure drop of each block, the average pore of each block, each block determines the theoretical drainage area of each block, and formula (1) is:
Wherein, N
rfor block reserves;
N
ffor whole district's reserves;
Np
rfor block tires out produce oil;
Np
ffor produce oil is tired out in full oil field;
Δ p
rfor block average pressure drop;
Δ p
ffor full oil field average pressure drop;
A
dfor theoretical drainage area;
φ is average pore;
H is that average sand is thick;
Boi is crude oil initial volume coefficient.
9. field area as claimed in claim 8 block boundary flow determining device, it is characterized in that, described flow determination module determines to study according to the tired produce oil of each block, the actual drainage area of each block the boundary flux that the boundary flux of block and formula (2) determine to study block further, and formula (2) is:
A
dfor theoretical drainage area;
A
pfor actual area area.
10. field area as claimed in claim 9 block boundary flow determining device, it is characterized in that, described connection block determination module produces each layer substratum sand-body distribution and deposition figure in bubble figure and geological research result according to the oil reservoir entirety in Production performance data is tired, determines and the periphery block that research block is communicated with.
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