CN102748007B - Well testing analytical method and device - Google Patents
Well testing analytical method and device Download PDFInfo
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- CN102748007B CN102748007B CN201210260155.XA CN201210260155A CN102748007B CN 102748007 B CN102748007 B CN 102748007B CN 201210260155 A CN201210260155 A CN 201210260155A CN 102748007 B CN102748007 B CN 102748007B
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Abstract
The invention provides a well testing analytical method which comprises the following steps: measuring basic parameters of an oil well and each phase fluid in the oil well; performing water-driven well testing analysis according to the basic parameters of the oil well and each phase fluid in the oil well, thereby obtaining basic information of oil deposit at a water-driving moment; selecting a single-phase oil in multi-phase fluid at the water-driving moment; performing pressure fitting by utilizing the basic information of the oil deposit, thereby obtaining fitting viscosity of the single-phase oil; performing polymer flooding well testing analysis by utilizing the fitting viscosity, thereby obtaining the basic information of the oil deposit at a polymer flooding moment; and monitoring the information of the oil deposit at the polymer flooding moment according to the basic information of the oil deposit at the polymer flooding moment. According to the well testing analytical method provided by the invention, the well testing analysis can be performed on the basis of the polymer flooding and the monitoring for the oil well is realized by analyzing the obtained basic information of the oil deposit at the polymer flooding moment. Correspondingly, the invention also provides a well testing analytical device so as to realize the application to practical production.
Description
Technical field
The application relates to oil reservoir development technical field, particularly a kind of well test analysis method and device.
Background technology
In oil exploitation process, exploitation personnel need to survey to determine whether oil well is arranged in oil reservoir to selected oil well.At present, the method that developer often adopts is well test analysis, and it is understanding oil reservoir, carries out the important dynamic analysis means of reservoir evaluation and Petroleum Production dynamic monitoring.
Measured result and result of calculation can contrast by above-mentioned well test analysis, the final essential information obtaining oil reservoir, as well storage constant, wellbore skin and permeability.Exploitation personnel can analyze the essential information of oil reservoir further, to determine piezometric conductivity near shaft bottom or between two wells and rock behavio(u)r parameter; Calculate the output capacity of mean reservoir pressure and well; Judge the characterisitic parameter of well, wellbore volume and pit shaft degree of contamination; Find the boundary types of oil reservoir; Crude oil reserve in estimation oil reservoir, for oil reservoir exploitation and maintenance provide foundation.
But current well test analysis is commonly the well test analysis based on water drive, and the multiple oil field of China uses polymer flooding to improve recovery ratio, therefore, is badly in need of a kind of well test analysis based on polymer flooding.
Summary of the invention
Technical problems to be solved in this application are to provide a kind of well test analysis method, and this well test analysis method can carry out well test analysis based on polymer flooding, obtain oil reservoir essential information during polymer flooding, to monitor oil reservoir.
In order to solve the problem, this application discloses a kind of well test analysis method, comprising:
Measure the basic parameter of each phase fluid in oil well and described oil well;
According to the basic parameter of each phase fluid in described oil well and described oil well, carry out the well test analysis of water drive, obtain the essential information of oil reservoir during water drive;
Single phase when choosing water drive in multiphase flow;
Utilize the essential information of described oil reservoir to carry out pressure matching, obtain the plan viscosity of described single phase;
Carry out the well test analysis of polymer flooding in conjunction with described plan viscosity, obtain the essential information of oil reservoir during polymer flooding;
According to the essential information of oil reservoir during described polymer flooding, reservoir information during polymer flooding is monitored.
Preferably, the described basic parameter according to each phase fluid in described oil well and described oil well, carries out the well test analysis of water drive, and during acquisition water drive, oil reservoir essential information comprises:
Measure shaft bottom actual pressure data during water drive;
Choose geological model, pit shaft type and reservoir boundary, obtain the default essential information of oil reservoir during water drive;
According to the default essential information of the basic parameter of each phase fluid in oil well and described oil well, geological model, pit shaft type, reservoir boundary and oil reservoir, black oil simulator is utilized to calculate flowing bottomhole pressure (FBHP) when obtaining water drive;
Flowing bottomhole pressure (FBHP) by actual pressure data during water drive and when calculating the water drive obtained carries out matching, obtains the essential information of oil reservoir during water drive.
Preferably, described flowing bottomhole pressure (FBHP) by actual pressure data during water drive and when calculating the water drive obtained carries out matching, and the essential information obtaining oil reservoir during water drive comprises:
The pressure differential of reality during acquisition water drive and pressure derivative, and draw the log-log graph of described pressure differential and pressure derivative;
The pressure differential of calculating during acquisition water drive and pressure derivative, and draw the log-log graph of described pressure differential and pressure derivative;
The pressure differential of calculating when the pressure differential of reality during water drive and the log-log graph of pressure derivative and water drive and the log-log graph of pressure derivative are carried out matching, if fitting precision is in default accuracy rating, the oil reservoir essential information during water drive of acquisition is required oil reservoir essential information; If fitting precision is not within the scope of predetermined accuracy, during amendment water drive, the default essential information of oil reservoir, carries out the well test analysis of water drive, until fitting precision is in default accuracy rating.
Preferably, the described essential information of described oil reservoir that utilizes carries out pressure matching, and the plan viscosity obtaining described single phase comprises:
According to the essential information of oil reservoir during water drive, the viscosity of change single phase, carries out well test analysis, obtains the plan viscosity of monophasic fluid.
Preferably, intend the well test analysis that viscosity carries out polymer flooding described in described combination, the essential information obtaining oil reservoir during polymer flooding comprises:
Choose water-oil phase model in black oil simulator, wherein aqueous phase is polymer solution, and aqueous phase viscosity is the viscosity of polymer solution, and oil phase is single phase, and oil phase viscosity is for intending viscosity, and the basic parameter of aqueous phase and oil phase is the basic parameter of polymer solution and single phase;
Measure actual pressure data during polymer flooding;
Choose geological model, pit shaft type and reservoir boundary, obtain the default essential information of oil reservoir during polymer flooding;
According to the basic parameter of described oil well basic parameter and described aqueous phase and oil phase fluid, geological model, pit shaft type, reservoir boundary and polymer flooding time oil reservoir default essential information, utilize black oil simulator to calculate flowing bottomhole pressure (FBHP) when obtaining polymer flooding;
Flowing bottomhole pressure (FBHP) by actual pressure data during polymer flooding and when calculating the polymer flooding obtained carries out matching, obtains the essential information of oil reservoir during polymer flooding.
Preferably, described flowing bottomhole pressure (FBHP) by actual pressure data during polymer flooding and when calculating the polymer flooding obtained carries out matching, and the essential information obtaining oil reservoir during polymer flooding comprises:
The pressure differential of reality during acquisition polymer flooding and pressure derivative, and draw the log-log graph of described pressure differential and pressure derivative;
The pressure differential of calculating during acquisition polymer flooding and pressure derivative, and draw the log-log graph of described pressure differential and pressure derivative;
The pressure differential of calculating when the pressure differential of reality during polymer flooding and the log-log graph of pressure derivative and polymer flooding and the log-log graph of pressure derivative are carried out matching, if fitting precision is in default accuracy rating, the oil reservoir essential information during polymer flooding of acquisition is required oil reservoir essential information; If fitting precision is not within the scope of predetermined accuracy, during amendment polymer flooding, the default essential information of oil reservoir, carries out the well test analysis of polymer flooding, until fitting precision is in default accuracy rating.
Preferably, in described oil well and described oil well, the basic parameter of each phase fluid comprises: the viscosity of well, each phase fluid, volume factor, compression coefficient, fluid density, formation thickness, degree of porosity and formation absolute permeability.
Preferably, the essential information of described oil reservoir comprises: well storage constant, wellbore skin, permeability, initial pressure and original formation pressure.
Disclosed herein as well is a kind of well test analysis device, comprising:
Basic parameter measuring unit, for measuring the basic parameter of each phase fluid in oil well and described oil well;
The well test analysis unit of water drive, for the basic parameter according to each phase fluid in described oil well and described oil well, carries out the well test analysis of water drive, obtains the essential information of oil reservoir during water drive;
Intend single-phase flow acquiring unit, single phase during for choosing water drive in heterogeneous fluid;
Intending viscosity acquiring unit, for utilizing the essential information of described oil reservoir to carry out pressure matching, drawing the plan viscosity of described single phase;
The well test analysis unit of polymer flooding, for carrying out the well test analysis of polymer flooding in conjunction with described plan viscosity, obtains the essential information of oil reservoir during polymer flooding;
Monitoring unit, for the essential information according to oil reservoir during described polymer flooding, monitors described oil well.
Preferably, the well test analysis unit of water drive comprises:
First measuring unit, actual pressure data during for measuring water drive;
First chooses unit, geological model during for choosing water drive, pit shaft type and reservoir boundary, obtains the default essential information of oil reservoir during water drive;
First computing unit, for the default essential information of the basic parameter according to each phase fluid in oil well and described oil well, geological model, pit shaft type, reservoir boundary and oil reservoir, utilizes black oil simulator to calculate flowing bottomhole pressure (FBHP) when obtaining water drive;
First pressure fitting unit, the flowing bottomhole pressure (FBHP) by actual pressure data during water drive and when calculating the water drive obtained carries out matching, obtains the essential information of oil reservoir during water drive.
Preferably, the first pressure fitting unit comprises:
First logarithmic chart drawing unit, during for obtaining water drive respectively reality with the pressure differential calculated and pressure derivative, and pressure differential and pressure derivative are carried out to the drafting of log-log graph;
First logarithmic chart fitting unit, for carrying out matching by the pressure differential of calculating when the pressure differential of reality during water drive and the log-log graph of pressure derivative and water drive and the log-log graph of pressure derivative;
First fitting precision judging unit, for judging fitting precision whether in default accuracy rating, if fitting precision is in default accuracy rating, the oil reservoir essential information during water drive of acquisition is required oil reservoir essential information; If fitting precision is not within the scope of predetermined accuracy, during amendment water drive, the default essential information of oil reservoir, carries out the well test analysis of water drive, until fitting precision is in default accuracy rating.
Preferably, polymer flooding well test analysis unit comprises:
Second measuring unit, the actual pressure data in shaft bottom during for measuring polymer flooding;
Second chooses unit, geological model during for choosing polymer flooding, pit shaft type and reservoir boundary, obtains the default essential information of oil reservoir during polymer flooding;
Second computing unit, for the default essential information of the basic parameter according to oil well and described oil phase and aqueous phase fluid, geological model, pit shaft type, reservoir boundary and oil reservoir, utilizes black oil simulator to calculate flowing bottomhole pressure (FBHP) when obtaining polymer flooding;
Second pressure fitting unit, carries out matching for the flowing bottomhole pressure (FBHP) by actual pressure data during polymer flooding and when calculating the polymer flooding obtained, obtains the essential information of oil reservoir during polymer flooding.
Preferably, the second pressure fitting unit comprises:
Second logarithmic chart drawing unit, during for obtaining polymer flooding respectively reality with the pressure differential calculated and pressure derivative, and pressure differential and pressure derivative are carried out to the drafting of log-log graph;
Second logarithmic chart fitting unit, for carrying out matching by the pressure differential of calculating when the pressure differential of reality during polymer flooding and the log-log graph of pressure derivative and polymer flooding and the log-log graph of pressure derivative;
Second fitting precision judging unit, for judging fitting precision whether in default accuracy rating, if fitting precision is in default accuracy rating, the oil reservoir essential information during polymer flooding of acquisition is required oil reservoir essential information; If fitting precision is not within the scope of predetermined accuracy, during amendment polymer flooding, the default essential information of oil reservoir, carries out the well test analysis of polymer flooding, until fitting precision is in default accuracy rating.
Preferably, also comprise:
Oil well output measuring unit, during for measuring water drive and polymer flooding, oil well is in the output of different time sections;
Oil reservoir flow sections division unit, for when the well test analysis of the well test analysis of water drive and polymer flooding, according to the output of described oil well in different time sections, oil reservoir is divided into multiple flow sections, the well test analysis of water drive and the well test analysis of polymer flooding are carried out successively to different flow sections.
Preferably, in described oil well and described oil well, the basic parameter of each phase fluid comprises: the viscosity of well, each phase fluid, volume factor, compression coefficient, fluid density, formation thickness, degree of porosity and formation absolute permeability.
Preferably, the essential information of described oil reservoir comprises: well storage constant, wellbore skin, permeability, initial pressure and original formation pressure.
Compared with prior art, the application comprises following advantage:
In this application, first the basic parameter of each phase fluid in oil well and oil well is measured, secondly the essential information of oil reservoir and the plan viscosity of monophasic fluid during acquisition water drive, the well test analysis of polymer flooding is carried out again in conjunction with described plan viscosity, obtain the essential information of oil reservoir during polymer flooding, according to the essential information of oil reservoir during described polymer flooding, described oil well is monitored.Therefore, the application can carry out well test analysis based on polymer flooding, and according to the essential information of oil reservoir during polymer flooding, can monitor described oil well.
Certainly, the arbitrary product implementing the application might not need to reach above-described all advantages simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present application, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the application, 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 well test analysis method that the application provides;
Fig. 2 is a sub-flow chart of a kind of well test analysis method that the application provides;
Fig. 3 is another the sub-process figure of a kind of well test analysis method that the application provides;
Fig. 4 is another the sub-process figure of a kind of well test analysis method that the application provides;
Fig. 5 is another the sub-process figure of a kind of well test analysis method that the application provides;
Fig. 6 is the oilfield development examples figure that the application provides;
Fig. 7 be the application provide polymer flooding time in-place permeability distribution map;
Pressure fitted figure when Fig. 8 is the well test analysis of the water drive that the application provides;
Pressure fitted figure when Fig. 9 is the well test analysis of the polymer flooding that the application provides;
Figure 10 is the structural representation of a kind of well test analysis device that the application provides;
Figure 11 is the structural representation of water drive well test analysis unit in the well test analysis device that provides of the application;
Figure 12 is the structural representation of pressure fitting unit in water drive well test analysis unit in the well test analysis device that provides of the application;
Figure 13 is the structural representation of polymer flooding well test analysis unit in the well test analysis device that provides of the application;
Figure 14 is the structural representation of pressure fitting unit in polymer flooding well test analysis unit in the well test analysis device that provides of the application;
Figure 15 is the another kind of structural representation of a kind of well test analysis device that the application provides.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present application, be clearly and completely described the technical scheme in the embodiment of the present application, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
Refer to Fig. 1, it illustrates the flow chart of a kind of well test analysis method of the application, can comprise the following steps:
Step 11: the basic parameter measuring each phase fluid in oil well and described oil well.
The present embodiment can by the basic parameter of each phase fluid in oil field experiment measuring oil well and oil well.Wherein, each phase fluid can comprise aqueous phase, oil phase and gas phase.Basic parameter can comprise well, the viscosity of each phase fluid, volume factor, compression coefficient, fluid density, formation thickness, degree of porosity and formation absolute permeability (hereinafter referred to as " permeability ").
Here it may be noted that and will divide flow sections to oil reservoir before the well test analysis carrying out water drive or polymer flooding, be conducive to the accuracy improving well test analysis.
Wherein, flow sections divides and can comprise: oil well during measurement water drive is in the output of different time sections, in the output of different time sections, oil reservoir is divided into multiple flow sections according to described oil well, divided multiple flow sections can carry out the well test analysis of water drive successively;
Oil reservoir, in the output of different time sections, is divided into multiple flow sections according to described oil well in the output of different time sections, divided multiple flow sections can carry out the well test analysis of polymer flooding successively by oil well during measurement polymer flooding.
Step 12: according to the basic parameter of each phase fluid in described oil well and described oil well, carry out the well test analysis of water drive, obtains the essential information of oil reservoir during water drive.
In the present embodiment, black oil simulator can be utilized to carry out the well test analysis of water drive, and according to well test analysis result obtain water drive time oil reservoir essential information.The essential information of described oil reservoir comprises: well storage constant, wellbore skin, permeability, initial pressure and original formation pressure.
Wherein the expression of black oil simulator is as follows:
Oil ingredient:
Water component:
Gas component:
Wherein,
S
o+S
w+S
g=1 (4)
p
cow=p
o-p
w=f(S
w,S
g) (5)
p
cgo=p
g-p
o=f(S
w,S
g) (6)
In formula, oil ingredient, the gentle component of water component can be respectively oil phase, aqueous phase and gas phase, and o, w, g are the subscript of Oil, Water, Gas phase; K is formation absolute permeability; K
ro, K
rw, K
rgbe respectively the relative permeability of oil phase, aqueous phase, gas phase; B is reservoir volume ratio; μ is viscosity; γ is relative density; P is pressure; Z is vertical coordinate; R
sfor dissolving oil-gas ratio; q
scfor component output or flow.
K in formula (1)-(3)
ro, K
rw, K
rg, p
cow, p
cgofor the function of saturation ratio.Wherein:
K
rw=K
rw(S
w)
K
rg=K
rg(S
g)
K
ro=K
ro(S
o)=K
ro(S
w,S
g)
p
cow=f(S
w)
p
cgo=f(S
g)
K
rw, K
rg, p
cow, p
cgoall can move experimental data by profit and oil-gas two-phase flow to obtain, K
roneed the formulae discovery such as application Stone.
B
o, B
w, B
gfor the volume factor of each phase fluid; μ
o, μ
w, μ
gfor the viscosity of each phase fluid; γ
o, γ
w, γ
gfor the relative density of each phase fluid.Under three-phase state and oil phase saturation state, the relative density of each phase fluid, volume factor, viscosity are all the functions of pressure P, as:
B
o=f(p)
R
s=f(p)
μ
o=f(p)
Under the unsaturated state of oil phase, when only having profit two kinds of phases in oil reservoir, the relative density of each phase fluid, volume factor, viscosity are bubble point pressure p
bwith the function of pressure p, as:
B
o=f(p,p
b)
ρ
o=f(p,p
b)
μ
o=f(p,p
b)
If rock pore volume has significant change with pressure, then have:
φ=φ
ref[1+C
r(p-p
ref)]
C in formula
rfor rock compressibility; φ is degree of porosity; φ
reffor reference pressure p
refunder degree of porosity.
Needing the heterogeneous fluid model selected according to the actual conditions of oil reservoir in black oil simulator when utilizing black oil simulator to carry out the well test analysis of water drive, as water-oil phase model can be selected and select oil gas water three phase model, selecting oil-water-gas three-phase model in the present embodiment.
In the present embodiment, above-mentioned by the basic parameter of each phase fluid in oil well and described oil well substitution black oil simulator, the detailed process obtaining the essential information of oil reservoir during water drive refers to shown in Fig. 2, can comprise the following steps:
Step 201: measure shaft bottom actual pressure data during water drive.
Step 202: choose geological model, pit shaft type and reservoir boundary, obtains the default essential information of oil reservoir during water drive.
Geological model when will choose the well test analysis being applicable to water drive when carrying out the well test analysis of water drive, pit shaft type and reservoir boundary, and the preset parameter value of oil reservoir essential information when obtaining water drive according to oil reservoir experience with mining.
Wherein, when carrying out well test analysis will according in oil reservoir recovery process to the understanding of oil reservoir and different constructure scheme, corresponding geological model, pit shaft type and reservoir boundary are chosen to different oil reservoirs.
Step 203: according to the default essential information of the basic parameter of each phase fluid in oil well and described oil well, geological model, pit shaft type, reservoir boundary and oil reservoir, utilizes black oil simulator to calculate flowing bottomhole pressure (FBHP) when obtaining water drive.
Step 204: the flowing bottomhole pressure (FBHP) by actual pressure data during water drive and when calculating the water drive obtained carries out matching, obtains the essential information of oil reservoir during water drive.
In the present embodiment, the process of pressure matching refers to shown in Fig. 3, can comprise the following steps:
Step 301: the pressure differential of reality during acquisition water drive and pressure derivative, and draw the log-log graph of described pressure differential and pressure derivative.
Step 302: the pressure differential of calculating during acquisition water drive and pressure derivative, and draw the log-log graph of described pressure differential and pressure derivative.
Wherein, the formula of calculating pressure difference and pressure derivative is as follows,
If (T
0, P
0) (T
1, P
1) ..., (T
n, P
n) be the pressure under different time, then pressure differential is: Δ p
1=P
1-P
0..., Δ p
n=P
n-P
0
Pressure derivative is: dp
1=(P
1-P
0)/(T
1-T
0) * T
1..., dp
n=(P
n-P
n-1)/(T
n-T
n-1) * T
n-1
Wherein, the drafting of log-log graph is on drop of pressure plate based on coordinate dimension.
Step 303: the pressure differential of calculating when the pressure differential of reality during water drive and the log-log graph of pressure derivative and water drive and the log-log graph of pressure derivative are carried out matching.
Step 304: judge fitting precision whether in the accuracy rating preset, if so, forward step 305 to; Forward step 306 to if not.
Wherein, the accuracy rating preset can arrange different accuracy ratings according to the situation of oil reservoir under application scenarios, is not limited this.
Step 305: oil reservoir essential information when obtaining water drive is required oil reservoir essential information.
Step 306: the default essential information of amendment oil reservoir, carries out the well test analysis of water drive, until fitting precision is in default accuracy rating.
Wherein, when not meeting precision, by observing the difference of measured curve and calculated curve, according to the flowing law of percolation equationk, and the change of different parameter preset is on the rule of calculated curve form impact, selects to need the parameter of adjustment to modify.Such as calculated curve and measured curve " dehiscing " is in different size, just carries out pressure matching by adjustment wellbore damage indicator.
The default essential information of amendment oil reservoir specifically can by the design parameter value in amendment oil reservoir essential information, using the default essential information of amended oil reservoir essential information as oil reservoir, again carry out the well test analysis of water drive according to the default essential information of the basic parameter of each phase fluid in oil well and described oil well, geological model, pit shaft type, reservoir boundary and oil reservoir.The detailed process of the well test analysis of water drive refers to Fig. 2 to carry out matching.
Step 13: single phase when choosing water drive in heterogeneous fluid.
Wherein, after choosing the single phase in the heterogeneous fluid in shaft bottom, single phase is endorsement phase.It is as follows that the single phase model chosen in black oil simulator carries out its computation model of well test analysis,
Wherein the volume factor of endorsement phase, compression coefficient design formulas are as follows:
Endorsement phase volume coefficient=oil-phase saturation * oil phase volume coefficient+water phase saturation * aqueous phase volume factor; Endorsement phase compression coefficient=oil-phase saturation * oil phase compressibility+water phase saturation * aqueous phase compression coefficient.
The parameter values of endorsement phase all can be tested by oil reservoir and account form obtains.
Wherein, the production system of well will be formulated according to selected shaft bottom heterogeneous fluid when carrying out well test analysis, as when selecting unidirectional oil, the production system of well is decided to be the yield production of stand oil, select the production system of well during aqueous phase to be decided to be the yield production of water, select the production system of well during water-oil phase to be decided to be the yield production of stand oil water.
Step 14: utilize the essential information of described oil reservoir to carry out pressure matching, obtain the plan viscosity of described single phase.
Be specially: the pressure differential and the pressure derivative that obtain the calculating under single phase model, and draw the log-log graph of described pressure differential and pressure derivative.The design formulas of pressure differential and pressure derivative is:
If (T
0, P
0) (T
1, P
1) ..., (T
n, P
n) be the pressure under different time, then pressure differential is: Δ p
1=P
1-P
0..., Δ p
n=P
n-P
0
Pressure derivative is: dp
1=(P
1-P
0)/(T
1-T
0) * T
1..., dp
n=(P
n-P
n-1)/(T
n-T
n-1) * T
n-1
The pressure differential of calculating when the pressure differential of the calculating under single phase model and the log-log graph of pressure derivative and water drive and the log-log graph of pressure derivative are carried out matching.Judge fitting precision whether in the accuracy rating preset, if, the viscosity of single phase is required plan viscosity, if not in default accuracy rating, the viscosity of change single phase, the pressure differential of calculating when carrying out the pressure differential of the calculating under single phase model and the log-log graph of pressure derivative and water drive and the matching of the log-log graph of pressure derivative, until fitting precision is in preset range.
Wherein, the accuracy rating preset can arrange different accuracy ratings according to the situation of oil reservoir under application scenarios, is not limited this.
Step 15: the well test analysis carrying out polymer flooding in conjunction with described plan viscosity, obtains the essential information of oil reservoir during polymer flooding.
The well test analysis of polymer flooding can utilize black oil simulator to carry out, and the well test analysis detailed process of polymer flooding refers to shown in Fig. 4, can comprise the following steps:
Step 401: choose the computation model of the water-oil phase model in black oil simulator as the well test analysis of polymer flooding.
Wherein, oil phase is single phase, and oil phase viscosity is for intending viscosity, and aqueous phase is polymer solution, and aqueous phase viscosity is the viscosity of polymer solution, and the basic parameter of oil phase and aqueous phase is respectively the basic parameter of single phase and polymer solution.
Wherein, the basic parameter of oil phase and aqueous phase can be tested by oil reservoir and account form acquisition.
Step 402: measure actual pressure data during polymer flooding.
Step 403: choose geological model, pit shaft type and reservoir boundary, obtains the default essential information of oil reservoir during polymer flooding.
Geological model when will choose the well test analysis being applicable to polymer flooding when carrying out the well test analysis of polymer flooding, pit shaft type and reservoir boundary, and the preset parameter value of oil reservoir essential information when obtaining polymer flooding according to oilfield exploitation experience.
Step 404: according to the basic parameter of the oil well basic parameter of described measurement and oil phase and aqueous phase fluid, geological model, pit shaft type, reservoir boundary and polymer flooding time oil reservoir default essential information, utilize black oil simulator to calculate flowing bottomhole pressure (FBHP) when obtaining polymer flooding.
Step 405: the flowing bottomhole pressure (FBHP) by actual pressure data during polymer flooding and when calculating the polymer flooding obtained carries out matching, obtains the essential information of oil reservoir during polymer flooding.
In the present embodiment, the process of pressure matching refers to shown in Fig. 5, can comprise the following steps:
Step 501: the pressure differential of reality during acquisition polymer flooding and pressure derivative, and draw the log-log graph of described pressure differential and pressure derivative.
Step 502: the pressure differential of calculating during acquisition polymer flooding and pressure derivative, and draw the log-log graph of described pressure differential and pressure derivative.
Wherein, the drafting of log-log graph with coordinate dimension on drop of pressure plate for benchmark.
Step 503: the pressure differential of calculating when the log-log graph of the pressure differential in reality during polymer flooding and pressure derivative and polymer flooding and the log-log graph of pressure derivative are carried out matching.
Step 504: judge fitting precision whether in the accuracy rating preset, if so, forward step 505 to; Forward step 506 to if not.
Step 505: the oil reservoir essential information during polymer flooding of acquisition is required oil reservoir essential information.
Step 506: the default essential information of oil reservoir during amendment polymer flooding, carries out the well test analysis of polymer flooding, until fitting precision is in default accuracy rating.
Wherein, the oil reservoir essential information that amendment is preset specifically can by the design parameter value in amendment oil reservoir essential information, using the default essential information of amended oil reservoir essential information as oil reservoir, again carry out the well test analysis of polymer flooding according to the default essential information of the basic parameter of each phase fluid in oil well and described oil well, geological model, pit shaft type, reservoir boundary and oil reservoir.The detailed process of the well test analysis of polymer flooding refers to Fig. 4 to carry out matching.
Step 16: according to the essential information of oil reservoir during described polymer flooding, oil well is monitored.
Refer to Fig. 6, it illustrates the example that the application monitors oil well according to the essential information of oil reservoir during polymer flooding, in certain oil reservoir region, middle a bite producing well, around four mouthfuls is Injection Well.Inject water when water drive to Injection Well, when polymer flooding to Injection Well injection of polymer solution, in producing well, take oil reservoir.
When using the well test analysis method of prior art to carry out the well test analysis of polymer flooding, in the oil reservoir essential information of acquisition: wellbore skin is-0.23, well storage constant is 0.7(m
3/ MPa), in-place permeability average out to 800mD.Wherein oil phase viscosity is 8.9mPa.s, and aqueous phase viscosity is 0.6mPa.s.
The well test analysis method adopting the application to provide carries out polymer flooding well test analysis, in the oil reservoir essential information of acquisition: wellbore skin is 5, and well storage constant is 0.8 (m
3/ MPa), as shown in Figure 7, wherein the viscosity of polymer solution is 12mPa.s in in-place permeability distribution.
After choosing the single phase in heterogeneous fluid, by pressure matching, the plan viscosity obtained is 2.9mPa.s.
Wherein, as shown in Figure 8, during polymer flooding, pressure matching situation as shown in Figure 9 for the pressure fitted figure during well test analysis of water drive.
The upper part curve map of Fig. 8 and Fig. 9 is observed pressure landing and derivative thereof and calculating pressure lands and the fitted figure of derivative; Lower part curve map is the fitted figure of observed pressure and calculating pressure.
When the well test analysis method that obvious employing the application provides carries out the well test analysis of polymer flooding, reduce in-place permeability and clearly reduce, and the epidermis of well just becomes from negative, meets oil field development dynamic.Wherein, oil field dynamic research is the feature showed in oilfield development process, and the larger change of wellbore skin is large, flow more difficult, the penetrating power of permeability representation polymer solution on stratum, polymer can cause polluting, so polymer solution flow is more difficult, permeability is more low better.
As can be seen here, adopt existing well test analysis method to carry out polymer flooding well test analysis, the wellbore skin the obtained negative value that an absolute number is very large often, does not meet oil field dynamic research, is wrong.
Application technique scheme, first the basic parameter of each phase fluid in oil well and oil well is measured, secondly the essential information of oil reservoir and the plan viscosity of monophasic fluid during acquisition water drive, the well test analysis of polymer flooding is carried out again in conjunction with described plan viscosity, obtain the essential information of oil reservoir during polymer flooding, according to the essential information of oil reservoir during described polymer flooding, described oil well is monitored.Therefore, the application can carry out well test analysis based on polymer flooding, and according to the essential information of oil reservoir during polymer flooding, can monitor described oil well.
Corresponding with said method, present invention also provides a kind of well test analysis device, in order to ensure said method implementation and application in practice.Refer to Figure 10, it illustrates a kind of structural representation of a kind of well test analysis device of the application, following element of construction can be comprised: the well test analysis unit 102 of basic parameter measuring unit 101, water drive, intend single-phase flow acquiring unit 103, intend viscosity acquiring unit 104, the well test analysis unit 105 of polymer flooding and monitoring unit 106.Wherein,
Basic parameter measuring unit 101, for measuring the basic parameter of each phase fluid in oil well and described oil well.
The well test analysis unit 102 of water drive, for the basic parameter according to each phase fluid in described oil well and described oil well, carries out the well test analysis of water drive, obtains the essential information of oil reservoir during water drive.Its concrete structure refers to Figure 11, and the well test analysis unit 102 of water drive comprises: the first measuring unit 201, the first chooses unit 202, the first computing unit 203 and the first pressure fitting unit 204, wherein,
First measuring unit 201, for measuring shaft bottom actual pressure data during water drive.
First chooses unit 202, geological model during for choosing water drive, pit shaft type and reservoir boundary, obtains the default essential information of oil reservoir during water drive.
First computing unit 203, for the default essential information of the basic parameter according to each phase fluid in oil well and described oil well, geological model, pit shaft type, reservoir boundary and oil reservoir, utilizes black oil simulator to calculate flowing bottomhole pressure (FBHP) when obtaining water drive.
First pressure fitting unit 204, carries out matching for the flowing bottomhole pressure (FBHP) by actual pressure data during water drive and when calculating the water drive obtained, obtains the essential information of oil reservoir during water drive.Its concrete structure is see Figure 12, and the first pressure fitting unit 204 comprises: the first logarithmic chart drawing unit 301, first logarithmic chart fitting unit 302 and the first fitting precision judging unit 303.Wherein,
First logarithmic chart drawing unit 301, during for obtaining water drive respectively reality with the pressure differential calculated and pressure derivative, and pressure differential and pressure derivative are carried out to the drafting of log-log graph.
First logarithmic chart fitting unit 302, for carrying out matching by the pressure differential of calculating when the pressure differential of reality during water drive and the log-log graph of pressure derivative and water drive and the log-log graph of pressure derivative.
First fitting precision judging unit 303, for judging fitting precision whether in default accuracy rating, if fitting precision is in default accuracy rating, the oil reservoir essential information during water drive of acquisition is required oil reservoir essential information; If fitting precision is not within the scope of predetermined accuracy, during amendment water drive, the default essential information of oil reservoir, carries out the well test analysis of water drive, until fitting precision is in default accuracy rating.
Intend single-phase flow acquiring unit 103, single phase during for choosing water drive in heterogeneous fluid.。
Intending viscosity acquiring unit 104, for utilizing the essential information of described oil reservoir to carry out pressure matching, obtaining the plan viscosity of described single phase.
The well test analysis unit 105 of polymer flooding, for carrying out the well test analysis of polymer flooding in conjunction with described plan viscosity, obtains the essential information of oil reservoir during polymer flooding.Its concrete structure refers to Figure 13, and the well test analysis unit 105 of polymer flooding comprises: the second measuring unit 401, the second chooses unit 402, the second computing unit 403 and the second pressure fitting unit 404.Wherein,
Second measuring unit 401, the actual pressure data in shaft bottom during for measuring polymer flooding.
Second chooses single 402, and geological model during for choosing polymer flooding, pit shaft type and reservoir boundary, choose the water-oil phase model in black oil simulator, obtain the default essential information of oil reservoir during polymer flooding.
Second computing unit 403, for the default essential information of the basic parameter according to oil well and described oil phase and aqueous phase fluid, geological model, pit shaft type, reservoir boundary and oil reservoir, utilizes black oil simulator to calculate flowing bottomhole pressure (FBHP) when obtaining polymer flooding.
Second pressure matching list 404, carries out matching for the flowing bottomhole pressure (FBHP) by actual pressure data during polymer flooding and when calculating the polymer flooding obtained, obtains the essential information of oil reservoir during polymer flooding.Its concrete structure refers to Figure 14, and the second pressure fitting unit 404 comprises: the second logarithmic chart drawing unit 501, second logarithmic chart matching list 502 and the second fitting precision judging unit 503, wherein,
Second logarithmic chart drawing unit 501, during for obtaining polymer flooding respectively reality with the pressure differential calculated and pressure derivative, and pressure differential and pressure derivative are carried out to the drafting of log-log graph.
Second logarithmic chart fitting unit 502, for carrying out matching by the pressure differential of calculating when the pressure differential of reality during polymer flooding and the log-log graph of pressure derivative and polymer flooding and the log-log graph of pressure derivative.
Second fitting precision judging unit 503 is for judging fitting precision whether in default accuracy rating, if fitting precision is in default accuracy rating, the oil reservoir essential information during polymer flooding of acquisition is required oil reservoir essential information; If fitting precision is not within the scope of predetermined accuracy, during amendment polymer flooding, the default essential information of oil reservoir, carries out the well test analysis of polymer flooding, until fitting precision is in default accuracy rating.
Monitoring unit 106, for the essential information according to oil reservoir during described polymer flooding, monitors described oil well.
In the present embodiment, flow sections to be divided to oil reservoir before the well test analysis carrying out water drive or polymer flooding, be conducive to the accuracy improving well test analysis, refer to Figure 15, it illustrates the another kind of structural representation of a kind of well test analysis device of the application, on Figure 10 basis, can also comprise: oil well output measuring unit 107 and oil reservoir flow sections division unit 108.Wherein,
Oil well output measuring unit 107, during for measuring water drive and polymer flooding, oil well is in the output of different time sections.
Oil reservoir flow sections division unit 108, for when the well test analysis of the well test analysis of water drive and polymer flooding, according to the output of described oil well in different time sections, oil reservoir is divided into multiple flow sections, the well test analysis of water drive and the well test analysis of polymer flooding are carried out successively to different flow sections.
Above embodiment describes on the basis of water drive well test analysis, single phase during by choosing water drive in heterogeneous fluid is as endorsement phase, and carry out pressure matching by the viscosity in amendment single phase parameter, obtain the plan viscosity of endorsement phase, choose the water-oil phase model in black oil simulator, wherein using single phase as oil phase, polymer solution is as aqueous phase, carry out the well test analysis of polymer flooding, thus reservoir information when obtaining polymer flooding, be conducive to the monitoring to oil reservoir.
A kind of well test analysis method provided the application above and device are described in detail, apply specific case herein to set forth the principle of the application and embodiment, the explanation of above embodiment is just for helping method and the core concept thereof of understanding the application; Meanwhile, for one of ordinary skill in the art, according to the thought of the application, all will change in specific embodiments and applications, in sum, this description should not be construed as the restriction to the application.
Claims (8)
1. a well test analysis method, is characterized in that, comprising:
Measure the basic parameter of each phase fluid in oil well and described oil well;
According to the basic parameter of each phase fluid in described oil well and described oil well, carry out the well test analysis of water drive, obtain the essential information of oil reservoir during water drive;
Single phase when choosing water drive in multiphase flow;
Utilize the essential information of described oil reservoir to carry out pressure matching, obtain the plan viscosity of described single phase;
Carry out the well test analysis of polymer flooding in conjunction with described plan viscosity, obtain the essential information of oil reservoir during polymer flooding;
According to the essential information of oil reservoir during described polymer flooding, reservoir information during polymer flooding is monitored;
Wherein, the described basic parameter according to each phase fluid in described oil well and described oil well, carries out the well test analysis of water drive, and during acquisition water drive, oil reservoir essential information comprises:
Measure shaft bottom actual pressure data during water drive;
Choose geological model, pit shaft type and reservoir boundary, obtain the default essential information of oil reservoir during water drive;
According to the default essential information of the basic parameter of each phase fluid in oil well and described oil well, geological model, pit shaft type, reservoir boundary and oil reservoir, black oil simulator is utilized to calculate flowing bottomhole pressure (FBHP) when obtaining water drive;
Flowing bottomhole pressure (FBHP) by actual pressure data during water drive and when calculating the water drive obtained carries out matching, obtains the essential information of oil reservoir during water drive;
Described flowing bottomhole pressure (FBHP) by actual pressure data during water drive and when calculating the water drive obtained carries out matching, and the essential information obtaining oil reservoir during water drive comprises:
The pressure differential of reality during acquisition water drive and pressure derivative, and draw the log-log graph of described pressure differential and pressure derivative;
The pressure differential of calculating during acquisition water drive and pressure derivative, and draw the log-log graph of described pressure differential and pressure derivative;
The pressure differential of calculating when the pressure differential of reality during water drive and the log-log graph of pressure derivative and water drive and the log-log graph of pressure derivative are carried out matching, if fitting precision is in default accuracy rating, the oil reservoir essential information during water drive of acquisition is required oil reservoir essential information; If fitting precision is not within the scope of predetermined accuracy, during amendment water drive, the default essential information of oil reservoir, carries out the well test analysis of water drive, until fitting precision is in default accuracy rating;
Intend the well test analysis that viscosity carries out polymer flooding described in described combination, the essential information obtaining oil reservoir during polymer flooding comprises:
Choose water-oil phase model in black oil simulator, wherein aqueous phase is polymer solution, and aqueous phase viscosity is the viscosity of polymer solution, and oil phase is single phase, and oil phase viscosity is for intending viscosity, and the basic parameter of aqueous phase and oil phase is the basic parameter of polymer solution and single phase;
Measure actual pressure data during polymer flooding;
Choose geological model, pit shaft type and reservoir boundary, obtain the default essential information of oil reservoir during polymer flooding;
According to the basic parameter of described oil well basic parameter and described aqueous phase and oil phase fluid, geological model, pit shaft type, reservoir boundary and polymer flooding time oil reservoir default essential information, utilize black oil simulator to calculate flowing bottomhole pressure (FBHP) when obtaining polymer flooding;
Flowing bottomhole pressure (FBHP) by actual pressure data during polymer flooding and when calculating the polymer flooding obtained carries out matching, obtains the essential information of oil reservoir during polymer flooding;
Described flowing bottomhole pressure (FBHP) by actual pressure data during polymer flooding and when calculating the polymer flooding obtained carries out matching, and the essential information obtaining oil reservoir during polymer flooding comprises:
The pressure differential of reality during acquisition polymer flooding and pressure derivative, and draw the log-log graph of described pressure differential and pressure derivative;
The pressure differential of calculating during acquisition polymer flooding and pressure derivative, and draw the log-log graph of described pressure differential and pressure derivative;
The pressure differential of calculating when the pressure differential of reality during polymer flooding and the log-log graph of pressure derivative and polymer flooding and the log-log graph of pressure derivative are carried out matching, if fitting precision is in default accuracy rating, the oil reservoir essential information during polymer flooding of acquisition is required oil reservoir essential information; If fitting precision is not within the scope of predetermined accuracy, during amendment polymer flooding, the default essential information of oil reservoir, carries out the well test analysis of polymer flooding, until fitting precision is in default accuracy rating.
2. method according to claim 1, is characterized in that, the described essential information of described oil reservoir that utilizes carries out pressure matching, and the plan viscosity obtaining described single phase comprises:
According to the essential information of oil reservoir during water drive, the viscosity of change single phase, carries out well test analysis, obtains the plan viscosity of monophasic fluid.
3. method according to claim 1, it is characterized in that, in described oil well and described oil well, the basic parameter of each phase fluid comprises: the viscosity of well, each phase fluid, volume factor, compression coefficient, fluid density, formation thickness, degree of porosity and formation absolute permeability.
4. method according to claim 1, is characterized in that, the essential information of described oil reservoir comprises: well storage constant, wellbore skin, permeability, initial pressure and original formation pressure.
5. a well test analysis device, is characterized in that, this device comprises:
Basic parameter measuring unit, for measuring the basic parameter of each phase fluid in oil well and described oil well;
The well test analysis unit of water drive, for the basic parameter according to each phase fluid in described oil well and described oil well, carries out the well test analysis of water drive, obtains the essential information of oil reservoir during water drive;
Intend single-phase flow acquiring unit, single phase during for choosing water drive in heterogeneous fluid;
Intending viscosity acquiring unit, for utilizing the essential information of described oil reservoir to carry out pressure matching, drawing the plan viscosity of described single phase;
The well test analysis unit of polymer flooding, for carrying out the well test analysis of polymer flooding in conjunction with described plan viscosity, obtains the essential information of oil reservoir during polymer flooding;
Monitoring unit, for the essential information according to oil reservoir during described polymer flooding, monitors described oil well;
Wherein, the well test analysis unit of described water drive comprises:
First measuring unit, actual pressure data during for measuring water drive;
First chooses unit, geological model during for choosing water drive, pit shaft type and reservoir boundary, obtains the default essential information of oil reservoir during water drive;
First computing unit, for the default essential information of the basic parameter according to each phase fluid in oil well and described oil well, geological model, pit shaft type, reservoir boundary and oil reservoir, utilizes black oil simulator to calculate flowing bottomhole pressure (FBHP) when obtaining water drive;
First pressure fitting unit, the flowing bottomhole pressure (FBHP) by actual pressure data during water drive and when calculating the water drive obtained carries out matching, obtains the essential information of oil reservoir during water drive;
Described first pressure fitting unit comprises:
First logarithmic chart drawing unit, during for obtaining water drive respectively reality with the pressure differential calculated and pressure derivative, and pressure differential and pressure derivative are carried out to the drafting of log-log graph;
First logarithmic chart fitting unit, for carrying out matching by the pressure differential of calculating when the pressure differential of reality during water drive and the log-log graph of pressure derivative and water drive and the log-log graph of pressure derivative;
First fitting precision judging unit, for judging fitting precision whether in default accuracy rating, if fitting precision is in default accuracy rating, the oil reservoir essential information during water drive of acquisition is required oil reservoir essential information; If fitting precision is not within the scope of predetermined accuracy, during amendment water drive, the default essential information of oil reservoir, carries out the well test analysis of water drive, until fitting precision is in default accuracy rating;
Described polymer flooding well test analysis unit comprises:
Second measuring unit, the actual pressure data in shaft bottom during for measuring polymer flooding;
Second chooses unit, geological model during for choosing polymer flooding, pit shaft type and reservoir boundary, obtains the default essential information of oil reservoir during polymer flooding;
Second computing unit, for the default essential information of the basic parameter according to oil well and described oil phase and aqueous phase fluid, geological model, pit shaft type, reservoir boundary and oil reservoir, utilizes black oil simulator to calculate flowing bottomhole pressure (FBHP) when obtaining polymer flooding;
Second pressure fitting unit, carries out matching for the flowing bottomhole pressure (FBHP) by actual pressure data during polymer flooding and when calculating the polymer flooding obtained, obtains the essential information of oil reservoir during polymer flooding;
Described second pressure fitting unit comprises:
Second logarithmic chart drawing unit, during for obtaining polymer flooding respectively reality with the pressure differential calculated and pressure derivative, and pressure differential and pressure derivative are carried out to the drafting of log-log graph;
Second logarithmic chart fitting unit, for carrying out matching by the pressure differential of calculating when the pressure differential of reality during polymer flooding and the log-log graph of pressure derivative and polymer flooding and the log-log graph of pressure derivative;
Second fitting precision judging unit, for judging fitting precision whether in default accuracy rating, if fitting precision is in default accuracy rating, the oil reservoir essential information during polymer flooding of acquisition is required oil reservoir essential information; If fitting precision is not within the scope of predetermined accuracy, during amendment polymer flooding, the default essential information of oil reservoir, carries out the well test analysis of polymer flooding, until fitting precision is in default accuracy rating.
6. device according to claim 5, is characterized in that, also comprises:
Oil well output measuring unit, during for measuring water drive and polymer flooding, oil well is in the output of different time sections;
Oil reservoir flow sections division unit, for when the well test analysis of the well test analysis of water drive and polymer flooding, according to the output of described oil well in different time sections, oil reservoir is divided into multiple flow sections, the well test analysis of water drive and the well test analysis of polymer flooding are carried out successively to different flow sections.
7. device according to claim 5, it is characterized in that, in described oil well and described oil well, the basic parameter of each phase fluid comprises: the viscosity of well, each phase fluid, volume factor, compression coefficient, fluid density, formation thickness, degree of porosity and formation absolute permeability.
8. device according to claim 5, is characterized in that, the essential information of described oil reservoir comprises: well storage constant, wellbore skin, permeability, initial pressure and original formation pressure.
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| CN105352851B (en) * | 2015-12-07 | 2017-11-10 | 中国石油化工股份有限公司 | A kind of recognition methods of entry well fluid type |
| CN107130955B (en) * | 2016-02-26 | 2020-12-11 | 中国石油化工股份有限公司 | Method for determining bottom hole flowing pressure and method for determining natural energy of reservoir |
| CN106198543B (en) * | 2016-07-04 | 2018-08-21 | 中国科学技术大学 | A kind of experimental provision of verification dynamic negative-pressure perforation tunnel cleaning degree |
| CN110924913B (en) * | 2018-09-18 | 2021-09-28 | 中国石油天然气股份有限公司 | Method and device for acquiring foam flooding formation pressure |
| CN109441415B (en) * | 2018-12-19 | 2021-03-30 | 中国石油天然气股份有限公司 | Well testing interpretation method of polymer flooding oil reservoir test well based on adjacent well interference |
| CN112343566B (en) * | 2019-08-08 | 2022-12-02 | 中国石油天然气股份有限公司 | Method and device for determining bottom hole flowing pressure of injection polymer well |
| CN110486008B (en) * | 2019-09-02 | 2023-11-03 | 合肥鼎盛锦业科技有限公司 | Parameter interpretation method and system for radial composite oil reservoir |
| CN110578503B (en) * | 2019-09-20 | 2022-07-26 | 合肥鼎盛锦业科技有限公司 | Method and system for determining initial water saturation of oil reservoir in polymer flooding numerical well testing |
| CN110991641B (en) * | 2019-12-17 | 2024-03-05 | 合肥鼎盛锦业科技有限公司 | Oil reservoir type analysis method and device and electronic equipment |
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