CN107169684A - Commingling production oil reservoir determines the development behavior computational methods under liquid measure working condition - Google Patents
Commingling production oil reservoir determines the development behavior computational methods under liquid measure working condition Download PDFInfo
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Abstract
The development behavior computational methods under liquid measure working condition are determined the invention discloses a kind of commingling production oil reservoir, are related to oil field development technical field, this method includes：Step 1, it is known that each substratum reservoir properties and fluid parameter；Step 2, it is known that the average water saturation of n moment substratum, obtains exit-end water saturation, fits flow rate equations by phase percolation curve, and then try to achieve oil-water relative permeability and moisture content；Step 3, it is known that total fluid production and n moment oil-water relative permeabilities, iteration tentative calculation, which is tried to achieve, to be determined under liquid measure working condition, n moment correspondence producing pressure differential Δ Pn；Step 4, by generalized Darcy's law, n moment Liquid outputs are tried to achieve, by moisture content fw n(Sw2), and then determine aquifer yield and oil production；Step 5, according to material balance principle, n+1 moment average water saturation is obtainedStep 6, (2) (5) are repeated, until n+1=N, calculating terminates.The present invention calculates commingling production fixed output quota liquid measure production development dynamic, can provide guidance for oil field production.
Description
Technical field
The present invention relates to oil field development technical field, more particularly to a kind of commingling production oil reservoir is determined under liquid measure working condition
Development behavior computational methods.
Background technology
The sandstone oil reservoir of China's continental deposit, longitudinal oil reservoir is more, is exploitation reducig cost, is generally carried out using commingling production
Exploitation.Commingling production determines the oil reservoir of liquid measure production, and oil production, the aquifer yield of producing pressure differential and each substratum are reservoir performance analysises
Important parameter, but be generally difficult to obtain.The present invention is on the basis of water filling free-boundary problem is considered, using iteration trial and error procedure
The producing pressure differential that does not match in the same time with given Liquid output is obtained, so as to further obtain the not oil-producing of each substratum in the same time
Amount, aquifer yield, guidance is provided for oil field actual production.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of commingling production oil reservoir and determine exploitation under liquid measure working condition
Dynamic calculation method, it is possible to achieve commingling production oil reservoir is determined under liquid measure working condition, not oil well production pressure difference and each small in the same time
Layer oil production and aquifer yield.Water filling free-boundary problem is considered, by finding the production not matched in the same time with given liquid measure
Pressure difference, so as to calculate the not oil production and aquifer yield of each substratum in the same time.
To achieve the above object, the present invention provides following technical scheme：The commingling production oil reservoir determines liquid measure working condition
Under development behavior computational methods the step of it is as follows：
(1) according to result of log interpretation, high pressure property analysis report, Production development data etc., each substratum reservoir thing is collected
Property and fluid parameter；
(2) the average water saturation of n moment substratum known to, obtains exit-end water saturation, is fitted point by phase percolation curve
Flow equation, and then try to achieve oil-water relative permeability and moisture content；
(3) total fluid production known to and n moment oil-water relative permeabilities, iteration tentative calculation are tried to achieve with giving individual well total fluid production phase
The producing pressure differential Δ P of matchingn；
(4) by generalized Darcy's law, n moment Liquid outputs are tried to achieve, then by the moisture content f at n momentw n(Sw2), and then determine production
Water and oil production；
(5) according to material balance principle, the average water saturation of n+1 moment each substratum is tried to achieve；
(6) repeat step (2)-(5), until n+1=N, calculating terminates.
It is preferred that, in the step (1), multiple reservoir properties and fluid parameter, including it is effectively thick containing area, reservoir
Degree, oil reservoir width, absolute permeability, porosity, underground crude oil viscosity, current averagely water saturation etc., start according to water filling
Barometric gradient and absolute permeability relation statistical law G=55.624 × K-1.7145, obtain water filling free-boundary problem.
It is preferred that, in the step (3), it is known that the n momentAccording to generalized Darcy's law, it is considered to which water filling starts pressure
The substratum Liquid output of power gradient isKnown commingling production oil reservoir fixed output quota liquid measure life
The individual well total fluid production of production, iteration tentative calculation n moment producing pressure differential Δs Pn, given until meeting each substratum Liquid output sum with series of strata
Liquid output it is equal.
It is preferred that, in the step (4), the producing pressure differential Δ that the n moment as known to step (3) matches with given Liquid output
Pn, according to generalized Darcy's law, try to achieve the Liquid output of each substratum, then each substratum n moment moisture content f in step (2)w n(Sw2),
Try to achieve the oil production and aquifer yield at n moment.
It is preferred that, in the step (5), according to material balance principle, average oil-containing caused by n to n+1 moment oil production
Saturation degree decrement, it is equal with average water saturation incrementss, by volumetric methodWhen trying to achieve n+1
Carve average water saturation.
It is preferred that, in the step (6), repeat step (2)-(5), until n+1=N, calculating terminates.
Beneficial effect using above technical scheme is：The commingling production oil reservoir determines the development behavior under liquid measure working condition
Computational methods consider longitudinal commingling production oil reservoir, and under fixed output quota liquid measure working condition, water filling free-boundary problem is to oil production
Influence；Simultaneously, it is contemplated that profit gross leak resistance changes in production process, as the production time increases, moisture content increase, oil
Water gross leak resistance reduces.This method is calculated and obtained under commingling production oil reservoir fixed output quota liquid measure working condition, not oil-producing in the same time
The important dynamic development parameters such as amount, aquifer yield, correspondence producing pressure differential, can provide guidance for oil field actual production.
Brief description of the drawings
The embodiment to the present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is that the commingling production oil reservoir of the present invention determines the development behavior computational methods physical model under liquid measure working condition
Figure；
Fig. 2 is that the commingling production oil reservoir of the present invention determines the flow chart of the development behavior computational methods under liquid measure working condition；
Fig. 3 be the present invention specific embodiment in commingling production oil reservoir determine each substratum development behavior under liquid measure working condition
Figure.
Embodiment
A kind of the invention will now be described in detail with reference to the accompanying drawings commingling production oil reservoir determines under liquid measure working condition development behavior
The preferred embodiment of computational methods.
Fig. 1, Fig. 2 and Fig. 3, which show a kind of commingling production oil reservoir of the invention, to be determined development behavior under liquid measure working condition and calculates
The embodiment of method：
The step of commingling production oil reservoir determines the development behavior computational methods under liquid measure working condition is as follows：
(1) according to result of log interpretation, high pressure property analysis report, Production development data etc., each substratum reservoir thing is collected
Property and fluid parameter；
(2) the average water saturation of n moment substratum known to, obtains exit-end water saturation, is fitted point by phase percolation curve
Flow equation, and then try to achieve oil-water relative permeability and moisture content；
(3) total fluid production known to and n moment oil-water relative permeabilities, iteration tentative calculation are tried to achieve with giving individual well total fluid production phase
The producing pressure differential Δ P of matchingn；
(4) by generalized Darcy's law, n moment Liquid outputs are tried to achieve, then by the moisture content f at n momentw n(Sw2), and then determine production
Water and oil production；
(5) according to material balance principle, the average water saturation of n+1 moment each substratum is tried to achieve；
(6) repeat step (2)-(5), until n+1=N, calculating terminates.
In step (1), multiple reservoir properties and fluid parameter, including containing area, reservoir effective thickness, oil reservoir width,
Absolute permeability, porosity, underground crude oil viscosity, current averagely water saturation etc., according to water filling free-boundary problem and absolutely
To permeability relation statistical law G=55.624 × K-1.7145, obtain water filling free-boundary problem.
In step (3), it is known that the n momentAccording to generalized Darcy's law, it is considered to water filling free-boundary problem it is small
Layer Liquid output beThe individual well of known commingling production oil reservoir fixed output quota liquid measure production is total
Liquid output, iteration tentative calculation n moment producing pressure differential Δs Pn, until meeting the Liquid output phase that each substratum Liquid output sum gives with series of strata
Deng.
In step (4), the producing pressure differential Δ P that the n moment as known to step (3) matches with given Liquid outputn, according to broad sense
Darcy's law, tries to achieve the Liquid output of each substratum, then each substratum n moment moisture content f in step (2)w n(Sw2), try to achieve the n moment
Oil production and aquifer yield.
In step (5), according to material balance principle, average oil saturation is reduced caused by n to n+1 moment oil production
Amount, it is equal with average water saturation incrementss, by volumetric methodTry to achieve the n+1 moment average aqueous
Saturation degree.
In step (6), repeat step (2)-(5), until n+1=N, calculating terminates
Fig. 2 determines the flow chart of the development behavior computational methods under liquid measure working condition for the commingling production oil reservoir of the present invention,
Including step 1, it is known that each substratum reservoir properties and fluid parameter；Step 2, it is known that the average water saturation of n moment substratum, is obtained
Exit-end water saturation, fits flow rate equations, and then try to achieve oil-water relative permeability and moisture content by phase percolation curve；Step
3, it is known that total fluid production and n moment oil-water relative permeabilities, iteration tentative calculation, which is tried to achieve, to be determined under liquid measure working condition, and n moment correspondence is given birth to
Produce pressure differential deltap Pn；Step 4, by generalized Darcy's law, n moment Liquid outputs are tried to achieve, by moisture content fw n(Sw2), and then determine aquifer yield
And oil production；Step 5, according to material balance principle, n+1 moment average water saturation is obtainedStep 6, repeat (2)-
(5), until n+1=N, calculating terminates.
The pungent oil field in east is typical Complex Fault Block Oil Reservoir, and longitudinal oil number of layers is more, and commingling production application is universal.Choose wherein
A series of strata exemplified by, elaborate, specific implementation step is as follows：
1. known to each substratum reservoir properties and fluid parameter
Known each substratum reservoir properties and fluid parameter, including containing area, reservoir effective thickness, oil reservoir width, definitely
Permeability, porosity, underground crude oil viscosity, average water saturation etc..According to water filling free-boundary problem and absolute permeability
Statistical law G=55.624 × K-1.7145, water filling free-boundary problem is obtained, 1 is specifically shown in Table.
Each substratum reservoir properties of table 1 and fluid parameter
2. known to the n momentCalculation of water gas relative permeability and moisture content
Commingling production oil reservoir is with fixed output quota liquid measure 20m3/ d is produced, and takes time interval Δ t=tn+1-tnFor 30 days, during producing
Between exemplified by 2 years (n=24), it is known that the average water saturation of each substratumRespectively 0.55013,0.61842,0.64254,
0.62543rd, 0.57323, by average water saturation and the relation of exit-end water saturationTry to achieve
Exit-end water saturationFor 0.48230,0.58473,0.62091,0.59524,0.51694, then by phase percolation curve, intend
Close the relation curve k for obtaining oil-water relative permeability and exit-end water saturationro=6.6443Sw2 2-9.1544Sw2+
3.1565, krw=3.0522Sw2 2-2.1082Sw2+ 0.3651, try to achieve oil relative permeabilityFor 0.2869,0.0754,
0.0340th, 0.0616,0.1998, aqueous phase relative permeabilityFor 0.0583,0.1759,0.2328,0.1916,0.0909；No
The influence of profit gravitational difference and capillary force is considered, according to flow rate equationsCalculate moisture content fw 24(Sw2)
For 0.8120,0.9233,0.9394,0.9272,0.8636.
3. known to individual well Liquid output and n moment oil-water relative permeabilities, tentative calculation iteration producing pressure differential
According to balanced flood, individual well Liquid output equal with injection rate is 20m3/d；N moment profit phases are understood by step (2)
To permeabilityWithAccording to generalized Darcy's law, it is considered to which the substratum Liquid output of water filling free-boundary problem isThe known total fixed output quota liquid measure of individual well, by iteration tentative calculation, until meeting each substratum
Liquid output sum is equal with individual well total fluid production, tries to achieve producing pressure differential Δ P24For 2.514MPa.
4. known to n moment producing pressure differential and moisture content, ask oil production and aquifer yield
The producing pressure differential Δ P that the known n=24 moment matches with given Liquid output24, according to generalized Darcy's law, try to achieve each
The Liquid output of substratumFor 0.6184,5.7914,1.9296,7.9434,3.7173m3/ d, then in step (2) during each substratum n
Carve moisture content fw 24(Sw2), try to achieve daily oil productionFor 0.1067,0.4033,0.1066,0.5244,0.4628m3/d；Produce water daily
AmountFor 0.5117,5.3881,1.8236,7.4190,3.2545m3/d。
5. according to conservation of matter principle, try to achieve n+1 moment average water saturation
According to material balance principle, average oil saturation decrement caused by n to n+1 moment oil production, with averagely containing
Water saturation incrementss are equal, and into high water-cut stage, profit gross leak resistance rate of change reduces, in smaller time interval,
It is approximately considered oil production and keeps constant, is a constant, by volumetric methodTry to achieve n+1=25
Moment average water saturationFor 0.55052,0.61961,0.64325,0.62658,0.57419.
6. repeating (2)-(5), until n+1=N, calculating terminates.If the time of calculating is 10 years, time interval is 30 days, then N
For 120, finish time development behavior is calculated, producing pressure differential Δ P is obtained120For 2.055MPa, daily oil production isFor 0.0433,
0.1355、0.0404、0.1673、0.1648m3/ d, water yield per dayFor 0.4800,5.7459,1.7010,7.4760,
4.0458m3/d。
Longitudinal commingling production oil reservoir is can be seen that from above calculated examples, determines under liquid measure working condition, tentative calculation can be passed through
Not corresponding producing pressure differential in the same time is obtained, according to generalized Darcy's law, Liquid output is tried to achieve, then by moisture content, further calculated
Go out oil production and aquifer yield.Increase over time, moisture content constantly rises, and profit gross leak resistance reduces, with fixed output quota liquid measure
Corresponding producing pressure differential constantly reduces, and oil production is less and less.Commingling production reservoir oil can be calculated the invention provides one kind
The method of well aquifer yield and oil production, can provide guidance, with certain promotional value to live actual production exploitation.
The above is only the preferred embodiment of the present invention, it is noted that for the person of ordinary skill of the art,
Without departing from the concept of the premise of the invention, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.
Claims (6)
1. a kind of commingling production oil reservoir determines the development behavior computational methods under liquid measure working condition, it is characterised in that：The multilayer
Close the step of development behavior computational methods under liquid measure working condition are determined in Tibetan of recovering the oil as follows：
(1) according to result of log interpretation, high pressure property analysis report, Production development data etc., collect each substratum reservoir properties and
Fluid parameter；
(2) the average water saturation of n moment substratum known to, obtains exit-end water saturation, shunt volume is fitted by phase percolation curve
Equation, and then try to achieve oil-water relative permeability and moisture content；
(3) total fluid production known to and n moment oil-water relative permeabilities, iteration tentative calculation are tried to achieve and given individual well total fluid production and matches
Producing pressure differential Δ Pn；
(4) by generalized Darcy's law, n moment Liquid outputs are tried to achieve, then by the moisture content f at n momentw n(Sw2), and then determine aquifer yield
And oil production；
(5) according to material balance principle, the average water saturation of n+1 moment each substratum is tried to achieve；
(6) repeat step (2)-(5), until n+1=N, calculating terminates.
2. commingling production oil reservoir according to claim 1 determines the development behavior computational methods under liquid measure working condition, it is special
Levy and be：In the step (1), multiple reservoir properties and fluid parameter, including it is wide containing area, reservoir effective thickness, oil reservoir
Degree, absolute permeability, porosity, at present underground crude oil viscosity, averagely water saturation etc., according to water filling free-boundary problem with
Absolute permeability relation statistical law G=55.624 × K-1.7145, obtain water filling free-boundary problem.
3. commingling production oil reservoir according to claim 1 determines the development behavior computational methods under liquid measure working condition, it is special
Levy and be：In the step (3), it is known that the n momentAccording to generalized Darcy's law, it is considered to water filling free-boundary problem
Substratum Liquid output isThe individual well of known commingling production oil reservoir fixed output quota liquid measure production
Total fluid production, iteration tentative calculation n moment producing pressure differential Δs Pn, until meeting the Liquid output that each substratum Liquid output sum gives with series of strata
It is equal.
4. commingling production oil reservoir according to claim 1 determines the development behavior computational methods under liquid measure working condition, it is special
Levy and be：In the step (4), the producing pressure differential Δ P that the n moment as known to step (3) matches with given Liquid outputn, foundation
Generalized Darcy's law, tries to achieve the Liquid output of each substratum, then each substratum n moment moisture content f in step (2)w n(Sw2), when trying to achieve n
The oil production and aquifer yield at quarter.
5. commingling production oil reservoir according to claim 1 determines the development behavior computational methods under liquid measure working condition, it is special
Levy and be：In the step (5), according to material balance principle, average oil saturation subtracts caused by n to n+1 moment oil production
On a small quantity, it is equal with average water saturation incrementss, by volumetric methodTrying to achieve the n+1 moment averagely contains
Water saturation.
6. commingling production oil reservoir according to claim 1 determines the development behavior computational methods under liquid measure working condition, it is special
Levy and be：In the step (6), repeat step (2)-(5), until n+1=N, calculating terminates.
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| CN112145162A (en) * | 2019-06-26 | 2020-12-29 | 中国石油化工股份有限公司 | Water-oil volume ratio calculation method and system |
| US11320564B1 (en) * | 2021-05-07 | 2022-05-03 | Southwest Petroleum University | Method and system for determining single-well dynamic reserve and recoverable reserve of gas-drive reservoir |
| CN115822562A (en) * | 2022-12-28 | 2023-03-21 | 中海石油(中国)有限公司海南分公司 | Longitudinal heterogeneous gas reservoir capacity evaluation method considering in-layer cross flow |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107965308A (en) * | 2017-10-11 | 2018-04-27 | 中国石油天然气股份有限公司 | Method and device for determining water yield of single well |
| CN107965308B (en) * | 2017-10-11 | 2020-12-01 | 中国石油天然气股份有限公司 | Method and device for determining water yield of single well |
| CN112145162A (en) * | 2019-06-26 | 2020-12-29 | 中国石油化工股份有限公司 | Water-oil volume ratio calculation method and system |
| CN112145162B (en) * | 2019-06-26 | 2024-02-23 | 中国石油化工股份有限公司 | Water-oil volume ratio calculation method and system |
| US11320564B1 (en) * | 2021-05-07 | 2022-05-03 | Southwest Petroleum University | Method and system for determining single-well dynamic reserve and recoverable reserve of gas-drive reservoir |
| CN115822562A (en) * | 2022-12-28 | 2023-03-21 | 中海石油(中国)有限公司海南分公司 | Longitudinal heterogeneous gas reservoir capacity evaluation method considering in-layer cross flow |
| CN115822562B (en) * | 2022-12-28 | 2023-07-11 | 中海石油(中国)有限公司海南分公司 | Longitudinal heterogeneous gas reservoir productivity evaluation method considering in-situ channeling |
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