CN109025965A - A kind of method of determining Oil in Super-low Permeability compact reservoir waterflooding extraction permeability limits - Google Patents
A kind of method of determining Oil in Super-low Permeability compact reservoir waterflooding extraction permeability limits Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 71
- 239000003921 oil Substances 0.000 claims description 70
- 238000004364 calculation method Methods 0.000 claims description 34
- 239000010779 crude oil Substances 0.000 claims description 22
- 238000002347 injection Methods 0.000 claims description 20
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- 238000004519 manufacturing process Methods 0.000 claims description 12
- 238000010276 construction Methods 0.000 claims description 9
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- E—FIXED CONSTRUCTIONS
- 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
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
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- 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
- E21B43/20—Displacing by water
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Abstract
The invention discloses a kind of methods of determining Oil in Super-low Permeability compact reservoir waterflooding extraction permeability limits, comprising the following steps: step 1): being maintained an equal level with unit area gross investment and profit as foundation, calculates economic limit net well density；Step 2): according to the calculated economic limit net well density of step 1), calculating Area of a well, calculates array pitch by Area of a well, calculates economic limit injector producer distance by array pitch；Step 3): limit water drive distance is calculated；Step 4): when economic limit injector producer distance be equal to limit water drive distance, determine Oil in Super-low Permeability Reservoirs waterflooding extraction permeability limits.The present invention is conducive to improve development benefit from source, based on economy ultimate well spacing density, it proposes to determine economic limit injector producer distance using economy ultimate well spacing density, the method for being suitble to the reservoir permeability lower limit effectively filled the water is determined according to the relationship of economic limit injector producer distance, limit water drive distance, to provide foundation for Oil in Super-low Permeability compact oil reservoir reasonable development mode.
Description
Technical field
The invention belongs to reservoir waterflooding extraction permeabilities to simulate computing technique field, and in particular to a kind of determining Oil in Super-low Permeability cause
The method of close reservoir waterflooding extraction permeability limits.
Background technique
Oil in Super-low Permeability compact reservoir permeability is generally less than 1mD, and the effective exploitation of such resource has become development of oil industry
The new issue faced, as development object (extra-low-permeability reservoir) reservoir permeability gradually reduces, exploitation quality is deteriorated year by year, is
Further increase well yield, exploitation well type gradually from being to horizontal well+volume fracturing exploitation based on well development to orient
Main transformation；Simultaneously numerical simulation study and mining site practice have shown that, with the reduction of reservoir permeability, waterflooding extraction and natural energy
The individual well of exploitation tires out oil-producing difference and becomes smaller, and theoretically analyzes, and waterflooding extraction, which takes effect, to be increasingly difficult to, when water filling brings benefits cannot be more
When the cost of after-teeming water system investment, it should be developed using natural energy, that is to say, that water filling supplement energy exploitation Oil in Super-low Permeability causes
Close oil reservoir should have certain scope of application.In order to further increase such oil reservoir development benefit, the fine and close oil of Oil in Super-low Permeability from source
How hiding waterflooding extraction reservoir permeability lower limit is determined to become problem.
The core of waterflooding extraction is to establish effective displacement system, and extra-low-permeability reservoir waterflooding extraction reservoir permeability lower limit is
The reservoir permeability lower limit of effective displacement system can be established, effective displacement includes the meaning of two aspects: first is that can establish
Displacement system, note adopt barometric gradient greater than starting pressure gradient；Second is that the displacement system established is that by the benefit of oil reservoir
Exploitation, that is to say, that be economically profitable.For how determining this problem of waterflooding extraction reservoir permeability lower limit, from
From the point of view of literature survey, Gaoyang etc. proposed to determine hypotonic contain using minimal flow pore throat radius method " scientific and technological Leader " 04 phase in 2011
Gas reservoir physical property lower limit: its core is the minimal flow pore throat radius that gas bearing interval is determined using experimental method, and then according to reality
Measured data establishes pore throat radius and porosity, permeability correlativity, so that it is determined that the porosity and permeability lower limit of reservoir.It is yellow
It is small it is bright et al. propose to adopt barometric gradient and the equal principle of starting pressure according to note " Xinjiang petroleum geology " 02 phase in 2008, obtain
Maximum well spacing is obtained, to obtain the permeability limits that low-permeability oil deposit under the conditions of different notes are adopted is capable of waterflooding extraction.Both the above
The permeability limit of low permeability reservoir that all can only establish displacement system that method determines, from the practical mining site of extra-low-permeability reservoir
From the point of view of the case where testing post evaluation of economy, displacement system is only established in water filling, and taking a long time water filling in other words can see
Effect is inadequate, if water filling is lesser to the amplification or stabilizing influence of yield, economically evaluates no benefit, and ultralow
The reservoir permeability lower limit that infiltration compact oil reservoir can establish effective displacement system is compared, and both the above method determines reservoir permeability
Lower limit value is less than normal, and method applicability is poor.Extra-low-permeability reservoir waterflooding extraction reservoir permeability lower limit should economically effectively and
Can establish effective displacement system the two aspect carry out the work.The present invention is based on economically effectively and effective displacement can be established
The principle of system, a kind of method for proposing determining Oil in Super-low Permeability compact reservoir waterflooding extraction permeability limits.
Summary of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, a kind of determining Oil in Super-low Permeability compact reservoir water filling is provided
The method for developing permeability limits overcomes in the prior art 1: determining that reservoir permeability lower limit value is less than normal, and 2: method applicability
Difference, 3: can not determine the problems such as economically effective.
In order to solve technical problem, the technical scheme is that a kind of determining Oil in Super-low Permeability compact reservoir waterflooding extraction seeps
The method of saturating rate lower limit, comprising the following steps:
Step 1): maintained an equal level with unit area gross investment and profit as foundation, calculate economic limit net well density；
Step 2): according to the calculated economic limit net well density of step 1), Area of a well is calculated, individual well control is passed through
Areal calculation array pitch processed calculates economic limit injector producer distance by array pitch；
Step 3): limit water drive distance is calculated；
Step 4): when economic limit injector producer distance be equal to limit water drive distance, determine Oil in Super-low Permeability Reservoirs waterflooding extraction permeate
Rate lower limit.
Preferably, the calculation formula of economic limit net well density is as follows in the step 1):
In above formula:
C-crude oil commodity rate, decimal；
UP-crude oil price, yuan/ton；
PC-crude oil cost valence, yuan/ton；
N-oil in-place, ton；
ER- oil recovery factor, decimal；
ID- drilling well investment, member；
IBThe investment of-surface construction, member；
R-loan rate, decimal；
T-investment payback time, year；
sm- economy ultimate well spacing density, mouth/× 104m2。
Preferably, Area of a well calculation formula is as follows in the step 2):
In above formula:
Area of a well under A-economy ultimate well spacing density, m2；
Preferably, array pitch calculation formula is as follows in the step 2):
In above formula:
A is array pitch, m；
Area of a well under A economy ultimate well spacing density, m2；
D is well spacing, m；
L is horizontal section length, m.
Preferably, economic limit injector producer distance calculation formula is as follows in the step 2):
Rec-lim=(a2+d2)1/2
In above formula:
Rec-limFor economic limit injector producer distance, m；
A is array pitch, m；
D is well spacing, m.
Preferably, different injection production pressure difference limit inferior water drives are obtained according to limit water drive distance calculation formula in the step 3)
Relation curve between distance and core permeability, wherein limit water drive distance calculation formula is as follows:
In above formula:
RThe limitFor limit water drive distance, m；
rwFor wellbore radius, m；
pHFor water injection well flowing bottomhole pressure (FBHP), MPa；
pwFor oil well flowing bottomhole pressure (FBHP), MPa；
K is core permeability, mD；
Preferably, when limit water drive distance is equal with economic limit injector producer distance, according to different injection production pressure difference limit inferiors
Relation curve between water drive distance and core permeability obtains Oil in Super-low Permeability Reservoirs waterflooding extraction permeability limits, wherein permeating
Rate lower limit calculation formula is as follows:
In above formula:
RThe limitFor limit water drive distance, m；
rwFor wellbore radius, m；
pHFor water injection well flowing bottomhole pressure (FBHP), MPa；
pwFor oil well flowing bottomhole pressure (FBHP), MPa；
kminFor permeability limits, mD.
Compared with the existing technology, the present invention has the advantages that
(1) present invention is conducive to further increase Oil in Super-low Permeability compact reservoir development benefit from source, with economic limit well
Based on reticular density, propose to determine economic limit injector producer distance using economy ultimate well spacing density, according to economic limit injection-production well
Relationship away from, limit water drive distance determines the method for being suitble to the reservoir permeability lower limit effectively filled the water, thus fine and close for Oil in Super-low Permeability
Oil reservoir reasonable development mode provides foundation；
(2) present invention determine that the method for Oil in Super-low Permeability compact reservoir permeability limits is reasonable, evaluation is accurate, calculation method
Simply, easy to operate, it can be widely applied to the calculating of various Oil in Super-low Permeability compact reservoir permeability limits, this method adaptability is good；
(3) present invention determine that the method for Oil in Super-low Permeability compact reservoir permeability limits joined crude oil cost valence, drilling well investment
Expense, surface construction expense, loan rate, investment payback time etc. calculate permeability limits in conjunction with economic cost.
Detailed description of the invention
Fig. 1, flow chart of the present invention；
Fig. 2,5 horizontal well "five-spot" flood system schematic diagram of the embodiment of the present invention；
The graph of relation of Fig. 3, the embodiment of the present invention 5 different injection production pressure difference limit inferior water drive distances and reservoir permeability.
Specific embodiment
The specific embodiment of the invention is described with reference to the accompanying drawings and embodiments:
It should be noted that structure, ratio, the size etc. illustrated in this specification institute attached drawing, only to cooperate explanation
The revealed content of book is not intended to limit the invention enforceable restriction so that those skilled in the art understands and reads
Condition, the modification of any structure, the change of proportionate relationship or the adjustment of size, do not influence the effect of present invention can be generated and
Under the purpose that can reach, should all still it fall in the range of disclosed technology contents can cover.
Meanwhile cited such as "upper" in this specification, "lower", "left", "right", " centre " and " one " term, also
Only being illustrated convenient for narration, rather than to limit the scope of the invention, relativeness is altered or modified, in nothing
Under essence change technology contents, when being also considered as the enforceable scope of the present invention.
Embodiment 1
As shown in Figure 1, the invention discloses a kind of method of determining Oil in Super-low Permeability compact reservoir waterflooding extraction permeability limits,
The following steps are included:
Step 1): maintained an equal level with unit area gross investment and profit as foundation, calculate economic limit net well density；
Step 2): according to the calculated economic limit net well density of step 1), Area of a well is calculated, individual well control is passed through
Areal calculation array pitch processed calculates economic limit injector producer distance by array pitch；
Step 3): limit water drive distance is calculated；
Step 4): when economic limit injector producer distance be equal to limit water drive distance, determine Oil in Super-low Permeability Reservoirs waterflooding extraction permeate
Rate lower limit.
Embodiment 2
As shown in Figure 1, the invention discloses a kind of method of determining Oil in Super-low Permeability compact reservoir waterflooding extraction permeability limits,
The following steps are included:
Step 1): maintained an equal level with unit area gross investment and profit as foundation, calculate economic limit net well density；
Step 2): according to the calculated economic limit net well density of step 1), Area of a well is calculated, individual well control is passed through
Areal calculation array pitch processed calculates economic limit injector producer distance by array pitch；
Step 3): limit water drive distance is calculated；
Step 4): when economic limit injector producer distance be equal to limit water drive distance, determine Oil in Super-low Permeability Reservoirs waterflooding extraction permeate
Rate lower limit.
Preferably, the calculation formula of economic limit net well density is as follows in the step 1):
In above formula:
C-crude oil commodity rate, decimal；
UP-crude oil price, yuan/ton；
PC-crude oil cost valence, yuan/ton；
N-oil in-place, ton；
ER- oil recovery factor, decimal；
ID- drilling well investment, member；
IBThe investment of-surface construction, member；
R-loan rate, decimal；
T-investment payback time, year；
sm- economy ultimate well spacing density, mouth/× 104m2。
Embodiment 3
As shown in Figure 1, the invention discloses a kind of method of determining Oil in Super-low Permeability compact reservoir waterflooding extraction permeability limits,
The following steps are included:
Step 1): maintained an equal level with unit area gross investment and profit as foundation, calculate economic limit net well density；
Step 2): according to the calculated economic limit net well density of step 1), Area of a well is calculated, individual well control is passed through
Areal calculation array pitch processed calculates economic limit injector producer distance by array pitch；
Step 3): limit water drive distance is calculated；
Step 4): when economic limit injector producer distance be equal to limit water drive distance, determine Oil in Super-low Permeability Reservoirs waterflooding extraction permeate
Rate lower limit.
Preferably, the calculation formula of economic limit net well density is as follows in the step 1):
In above formula:
C-crude oil commodity rate, decimal；
UP-crude oil price, yuan/ton；
PC-crude oil cost valence, yuan/ton；
N-oil in-place, ton；
ER- oil recovery factor, decimal；
ID- drilling well investment, member；
IBThe investment of-surface construction, member；
R-loan rate, decimal；
T-investment payback time, year；
sm- economy ultimate well spacing density, mouth/× 104m2。
Preferably, Area of a well calculation formula is as follows in the step 2):
In above formula:
Area of a well under A-economy ultimate well spacing density, m2；
Preferably, array pitch calculation formula is as follows in the step 2):
In above formula:
A is array pitch, m；
Area of a well under A economy ultimate well spacing density, m2；
D is well spacing, m；
L is horizontal section length, m.
Preferably, economic limit injector producer distance calculation formula is as follows in the step 2):
Rec-lim=(a2+d2)1/2
In above formula:
Rec-limFor economic limit injector producer distance, m；
A is array pitch, m；
D is well spacing, m.
Embodiment 4
As shown in Figure 1, the invention discloses a kind of method of determining Oil in Super-low Permeability compact reservoir waterflooding extraction permeability limits,
The following steps are included:
Step 1): maintained an equal level with unit area gross investment and profit as foundation, calculate economic limit net well density；
Step 2): according to the calculated economic limit net well density of step 1), Area of a well is calculated, individual well control is passed through
Areal calculation array pitch processed calculates economic limit injector producer distance by array pitch；
Step 3): limit water drive distance is calculated；
Step 4): when economic limit injector producer distance be equal to limit water drive distance, determine Oil in Super-low Permeability Reservoirs waterflooding extraction permeate
Rate lower limit.
Preferably, the calculation formula of economic limit net well density is as follows in the step 1):
In above formula:
C-crude oil commodity rate, decimal；
UP-crude oil price, yuan/ton；
PC-crude oil cost valence, yuan/ton；
N-oil in-place, ton；
ER- oil recovery factor, decimal；
ID- drilling well investment, member；
IBThe investment of-surface construction, member；
R-loan rate, decimal；
T-investment payback time, year；
sm- economy ultimate well spacing density, mouth/× 104m2。
Preferably, Area of a well calculation formula is as follows in the step 2):
In above formula:
Area of a well under A-economy ultimate well spacing density, m2；
Preferably, array pitch calculation formula is as follows in the step 2):
In above formula:
A is array pitch, m；
Area of a well under A economy ultimate well spacing density, m2；
D is well spacing, m；
L is horizontal section length, m.
Preferably, economic limit injector producer distance calculation formula is as follows in the step 2):
Rec-lim=(a2+d2)1/2
In above formula:
Rec-limFor economic limit injector producer distance, m；
A is array pitch, m；
D is well spacing, m.
Preferably, different injection production pressure difference limit inferior water drives are obtained according to limit water drive distance calculation formula in the step 3)
Relation curve between distance and core permeability, wherein limit water drive distance calculation formula is as follows:
In above formula:
RThe limitFor limit water drive distance, m；
rwFor wellbore radius, m；
pHFor water injection well flowing bottomhole pressure (FBHP), MPa；
pwFor oil well flowing bottomhole pressure (FBHP), MPa；
K is core permeability, mD；
Preferably, when limit water drive distance is equal with economic limit injector producer distance, according to different injection production pressure difference limit inferiors
Relation curve between water drive distance and core permeability obtains Oil in Super-low Permeability Reservoirs waterflooding extraction permeability limits, wherein permeating
Rate lower limit calculation formula is as follows:
In above formula:
RThe limitFor limit water drive distance, m；
rwFor wellbore radius, m；
pHFor water injection well flowing bottomhole pressure (FBHP), MPa；
pwFor oil well flowing bottomhole pressure (FBHP), MPa；
kminFor permeability limits, mD.
Embodiment 5
As shown in Figures 1 to 3, the present embodiment is by taking China celebrates Chang-6 oil reservoir as an example.
Deep lake-depth lake the parfacies of China celebrating Chang-6 oil reservoir development prodelta~half, sedimentary micro mainly with distributary channel,
Based on gravity flow channel, host sand body 10~45m of tape thickness, 10~15km of sandbody width, from the water filling of development straight well, level in 2010
The extensive volume fracturing test of well, but since 6 physical property difference of Hua Qingchang is larger, some block flood effectiveness are preferable, and some areas
Block water filling is really ineffective, it is therefore desirable to determine the permeability limits of waterflooding extraction.
Step 1): maintained an equal level with unit area gross investment and profit as according to calculating economy ultimate well spacing density
The value of each parameter is according to Changqing oilfields actual conditions value in formula, as shown in table 1.
In above formula:
C-crude oil commodity rate, decimal；
UP-crude oil price, yuan/ton；
PC-crude oil cost valence, yuan/ton；
N-oil in-place, ton；
ER- oil recovery factor, decimal；
ID- drilling well investment, member；
IBThe investment of-surface construction, member；
R-loan rate, decimal；
T-investment payback time, year；
sm- economy ultimate well spacing density, mouth/× 104m2。
1 economy ultimate well spacing density parameter list of table
| Crude oil commodity rate c/ decimal | 0.96 | I is invested in drilling wellD/ member | 24660000 |
| PC/ yuan/ton of crude oil cost valence | 866 | Surface construction invests IB/ member | 2557800 |
| N/ tons of oil in-place | 500000 | Loan rate r/ decimal | 0.058 |
| Oil recovery factor ER/ decimal | 0.1 | Investment payback time T/ | 6.1 |
The economy ultimate well spacing density under different oil prices is calculated according to above formula.
Step 2): Area of a well calculates
According to calculated economy ultimate well spacing density, corresponding Area of a well is calculated.
In above formula:
Area of a well under A-economy ultimate well spacing density, m2；
Step 3): array pitch calculates
As shown in Fig. 2, for geology and process aspect, when horizontal segment L is 600m, well spacing d is by taking five-spot pattern as an example
When 600m, the higher reservoir-encountered rate of horizontal well not only can guarantee, but also be able to achieve all standing of fracturing reform, calculate different individual well controls
The corresponding array pitch of area processed.
In above formula:
A is array pitch, m；
Area of a well under A economy ultimate well spacing density, m2；
D is well spacing, m；
L is horizontal section length, m.
Step 4): economic limit injector producer distance calculates
As shown in Fig. 2, calculating the injector producer distance between water injection well and producing well, calculated result is such as according to trigonometric function relationship
Shown in table 2.
Rec-lim=(a2+d2)1/2
In above formula:
Rec-limFor economic limit injector producer distance, m；
A is array pitch, m；
D is well spacing, m.
Each parameter calculated result value under the different oil prices of table 2
Step 5): limit water drive distance calculates
(1) starting pressure gradient calculates
According to starting pressure gradient laboratory experiment Measurement results, obtains this area starting pressure gradient and rock core permeates
Relational expression between rate.
λ=0.0151k-1.024
In above formula:
λ is starting pressure gradient, MPa/m；
K is core permeability, mD.
(2) Oil in Super-low Permeability compact reservoir waterflooding extraction permeability limits are determined
It is flowed down according to planar radial, Isoquant source-remittance main stream line midpoint formation pressure gradient, which is greater than under irreducible water, to be opened
The principle of dynamic pressure force gradient calculates different starting pressure gradient limit inferior water drive distances.
λ is brought into above formula, different permeability limit inferior water drive distances are obtained
In above formula:
RThe limitFor limit water drive distance, m；
rwFor wellbore radius, m；
pHFor water injection well flowing bottomhole pressure (FBHP), MPa；
pwFor oil well flowing bottomhole pressure (FBHP), MPa；
K is core permeability, mD；
When limit water drive distance is equal with economic limit injector producer distance, according to different injection production pressure difference limit inferior water drive distances
Relation curve (as shown in Figure 3) between core permeability, obtains Oil in Super-low Permeability Reservoirs waterflooding extraction permeability limits, wherein seeping
Saturating rate lower limit calculation formula is as follows:
In above formula:
RThe limitFor limit water drive distance, m；
rwFor wellbore radius, m；
pHFor water injection well flowing bottomhole pressure (FBHP), MPa；
pwFor oil well flowing bottomhole pressure (FBHP), MPa；
kminFor permeability limits, mD.
Different injection production pressure difference limit inferior water drive distances are obtained with the relation curve between reservoir permeability (such as according to above formula
Shown in Fig. 3), oil price is 2600 yuan/ton at present, and searching corresponding economic limit injector producer distance according to table 2 is 316.5m, local super
Hypotonic compact reservoir injection production pressure difference is generally in 20MPa or so, when economic limit injector producer distance is equal to limit water drive distance 316.5m
When, according to Fig. 3, determining waterflooding extraction Oil in Super-low Permeability compact reservoir permeability limits are 0.25mD.
10MPa, 15MPa, 20MPa and 25MPa injection production pressure difference limit inferior water drive distance and reservoir permeability are depicted in Fig. 3
Between relation curve.
The present invention is conducive to further increase Oil in Super-low Permeability compact reservoir development benefit from source, close with economic limit well pattern
Based on degree, propose to determine economic limit injector producer distance using economy ultimate well spacing density, according to economic limit injector producer distance, pole
It restricts water supply and drives the method that the relationship of distance determines the suitable reservoir permeability lower limit effectively filled the water, to be closed for Oil in Super-low Permeability compact oil reservoir
It manages development scheme and foundation is provided.
Present invention determine that the method for Oil in Super-low Permeability compact reservoir permeability limits is reasonable, evaluation is accurate, calculation method letter
It is single, it is easy to operate, it can be widely applied to the calculating of various Oil in Super-low Permeability compact reservoir permeability limits, this method adaptability is good.
Present invention determine that the method for Oil in Super-low Permeability compact reservoir permeability limits joined crude oil cost valence, drilling well capital cost
With, surface construction expense, loan rate, investment payback time etc., calculate permeability limits in conjunction with economic cost.
The preferred embodiment for the present invention is explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Mode within the knowledge of a person skilled in the art can also be without departing from the purpose of the present invention
It makes a variety of changes.
Many other changes and remodeling can be made by not departing from the spirit and scope of the present invention.It should be appreciated that the present invention is not
It is limited to specific embodiment, the scope of the present invention is defined by the following claims.
Claims (7)
1. a kind of method of determining Oil in Super-low Permeability compact reservoir waterflooding extraction permeability limits, which comprises the following steps:
Step 1): maintained an equal level with unit area gross investment and profit as foundation, calculate economic limit net well density；
Step 2): according to the calculated economic limit net well density of step 1), Area of a well is calculated, single well-controlled face is passed through
Product calculates array pitch, calculates economic limit injector producer distance by array pitch；
Step 3): limit water drive distance is calculated；
Step 4): when economic limit injector producer distance be equal to limit water drive distance, determine under Oil in Super-low Permeability Reservoirs waterflooding extraction permeability
Limit.
2. a kind of method of determining Oil in Super-low Permeability compact reservoir waterflooding extraction permeability limits according to claim 1, special
Sign is that the calculation formula of economic limit net well density is as follows in the step 1):
In above formula:
C-crude oil commodity rate, decimal；
UP-crude oil price, yuan/ton；
PC-crude oil cost valence, yuan/ton；
N-oil in-place, ton；
ER- oil recovery factor, decimal；
ID- drilling well investment, member；
IBThe investment of-surface construction, member；
R-loan rate, decimal；
T-investment payback time, year；
sm- economy ultimate well spacing density, mouth/× 104m2。
3. a kind of method of determining Oil in Super-low Permeability compact reservoir waterflooding extraction permeability limits according to claim 2, special
Sign is that Area of a well calculation formula is as follows in the step 2):
In above formula:
Area of a well under A-economy ultimate well spacing density, m2。
4. a kind of method of determining Oil in Super-low Permeability compact reservoir waterflooding extraction permeability limits according to claim 3, special
Sign is that array pitch calculation formula is as follows in the step 2):
In above formula:
A is array pitch, m；
Area of a well under A economy ultimate well spacing density, m2；
D is well spacing, m；
L is horizontal section length, m.
5. a kind of method of determining Oil in Super-low Permeability compact reservoir waterflooding extraction permeability limits according to claim 4, special
Sign is that economic limit injector producer distance calculation formula is as follows in the step 2):
Rec-lim=(a2+d2)1/2
In above formula:
Rec-limFor economic limit injector producer distance, m；
A is array pitch, m；
D is well spacing, m.
6. a kind of method of determining Oil in Super-low Permeability compact reservoir waterflooding extraction permeability limits according to claim 5, special
Sign is, obtains different injection production pressure difference limit inferior water drive distances and rock according to limit water drive distance calculation formula in the step 3)
Relation curve between heart permeability, wherein limit water drive distance calculation formula is as follows:
In above formula:
RThe limitFor limit water drive distance, m；
rwFor wellbore radius, m；
pHFor water injection well flowing bottomhole pressure (FBHP), MPa；
pwFor oil well flowing bottomhole pressure (FBHP), MPa；
K is core permeability, mD.
7. a kind of method of determining Oil in Super-low Permeability compact reservoir waterflooding extraction permeability limits according to claim 6, special
Sign is, when limit water drive distance is equal with economic limit injector producer distance, according to different injection production pressure difference limit inferior water drive distances
Relation curve between core permeability obtains Oil in Super-low Permeability Reservoirs waterflooding extraction permeability limits, wherein permeability limits meter
It is as follows to calculate formula:
In above formula:
RThe limitFor limit water drive distance, m；
rwFor wellbore radius, m；
pHFor water injection well flowing bottomhole pressure (FBHP), MPa；
pwFor oil well flowing bottomhole pressure (FBHP), MPa；
kminFor permeability limits, mD.
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| CN111075423A (en) * | 2020-01-03 | 2020-04-28 | 中国石油化工股份有限公司 | Method for determining water injection development well spacing of low-permeability sandstone reservoir |
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| CN113486537B (en) * | 2021-08-04 | 2022-09-23 | 中国石油大学(北京) | Well spacing design method, device and equipment based on gas-water alternating oil displacement |
| CN113761733A (en) * | 2021-08-31 | 2021-12-07 | 中国石油天然气股份有限公司 | Method and device for creating self-driving well exploitation scheme |
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