CN106934084B - Phase state fitting method for condensate gas reservoir with bottom oil - Google Patents
Phase state fitting method for condensate gas reservoir with bottom oil Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 40
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- 238000011160 research Methods 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 description 2
- QWTDNUCVQCZILF-UHFFFAOYSA-N isopentane Chemical compound CCC(C)C QWTDNUCVQCZILF-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 206010021137 Hypovolaemia Diseases 0.000 description 1
- 241001506308 Potato virus T Species 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- AFABGHUZZDYHJO-UHFFFAOYSA-N dimethyl butane Natural products CCCC(C)C AFABGHUZZDYHJO-UHFFFAOYSA-N 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
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- 230000009545 invasion Effects 0.000 description 1
- 239000001282 iso-butane Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 229920002102 polyvinyl toluene Polymers 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000341 volatile oil Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a phase state fitting method for a condensate gas reservoir with bottom oil, which comprises the following steps: respectively obtaining bottom oil and condensate gas from a gas reservoir, and respectively determining N in the bottom oil and the condensate gas2、CO2、C1、C2、C3、C4、C5、C6And C7+The molar content of (a); dividing quasi components according to each component of the bottom oil and the condensate gas, and determining N in the quasi components corresponding to the bottom oil2、CO2、C1O、C2O、C34O、C56O、C7O+Determining N in the pseudo-component corresponding to the condensate gas2、CO2、C1Q、C2Q、C34Q、C56Q、C7Q+According to the molar content of the pseudo components, and the molar content of the pseudo components corresponding to the bottom oil and the condensate gas, the bottom oil and the condensate gas are subjected to phase state fitting.
Description
Technical Field
The invention relates to the technical field of oil and gas field phase state research, in particular to a phase state fitting method for a condensate gas reservoir with bottom oil.
Background
The condensate gas reservoir is a special and complex gas reservoir, and the seepage of condensate gas in a stratum is accompanied with complex phase change in the process of exploitation, so that the research on the phase characteristics of the condensate gas reservoir has important significance for efficiently developing and exploiting the condensate gas field, the type of the gas reservoir can be judged according to the phase characteristics of the condensate gas, the reserve volume of the gas field can be calculated, and the stratum retrograde condensate oil loss of the condensate gas field can be exploited in a failure mode, so that a basis is provided for determining a reasonable development mode and improving the condensate oil recovery rate.
At present, in the development process of a condensate gas field, phase behaviors described by a state equation are matched with experimental data through phase state fitting mainly depending on a PVT phase state experimental test of an oil-gas system, then various PVT phase state simulation calculations are carried out by combining the experimental processes of equal composition expansion, equal volume depletion, separator test, dew point pressure test and the like, finally the phase state of the oil-gas hydrocarbon system is described through a P-T (pressure-temperature) phase diagram, however, for the condensate gas reservoir with bottom oil, the existing PVT fitting method uses the PVT (pressure-volume-temperature) equation of the condensate gas to describe the phase state change of the whole gas reservoir, so that the phase state fitting of the bottom oil in the condensate gas reservoir has great errors (shown in figures 1-2), and the phase state fitting errors can cause serious deviation of important results such as calculated bottom oil viscosity, density, gas-oil ratio, storage capacity and the like, therefore, the accuracy of numerical simulation calculation is influenced, and two sets of PVT equations are proposed for describing the fluid phase states of oil and gas respectively for the relevant research.
However, when two sets of PVT equations are used to describe the fluid phase states of oil and gas respectively, the description of the oil and gas phases is very accurate in the original state, but in the actual production, under the influence of development and production, the phenomenon that bottom oil invades into a condensate region or condensate gas leaks into the bottom oil region is very common, at this time, two sets of PVTs generate a great problem, namely after the bottom oil enters into the condensate region, the viscosity, density, bubble point pressure and the like of the bottom oil are changed violently, and the accuracy of the final calculated result is reduced, so that the two sets of PVT equations cannot simultaneously and accurately describe the phase state changes of the bottom oil and the condensate gas.
Disclosure of Invention
The invention provides a phase state fitting method for a condensate gas reservoir with bottom oil, which solves the technical problem that the phase state change of the condensate gas reservoir with bottom oil cannot be accurately described by the conventional phase state fitting method.
The invention provides a phase state fitting method for a condensate gas reservoir with bottom oil, which comprises the following steps:
respectively obtaining bottom oil and condensate gas from a gas reservoir, and respectively determining the molar content of each component in the bottom oil and the condensate gas, wherein each component in the bottom oil and the condensate gas comprises: n is a radical of2、CO2、C1、C2、C3、C4、C5、C6And C7+；
Dividing quasi-components according to the components of the base oil and the condensate gas, wherein the quasi-components comprise: n is a radical of2、CO2、C1Q、C2Q、C34Q、C56Q、C7Q+、C1O、C2O、C34O、C56O、C7O+And determining N in the simulated components corresponding to the base oil according to the molar content of each component in the base oil2、CO2、C1O、C2O、C34O、C56O、C7O+Wherein C in the pseudo component corresponding to the base oil1Q、C2Q、C34Q、C56Q、C7Q+The molar content of (A) is zero; determining N in the pseudo-components corresponding to the condensate gas according to the molar content of each component in the condensate gas2、CO2、C1Q、C2Q、C34Q、C56Q、C7Q+Wherein C is in the pseudo-component corresponding to the condensate gas1O、C2O、C34O、C56O、C7O+The molar content of (A) is zero;
and performing phase state fitting on the base oil and the condensate gas according to the molar contents of the quasi-components corresponding to the quasi-components, the base oil and the condensate gas.
In a specific embodiment of the present invention, the obtaining a pseudo component from each component of the base oil and the condensate gas includes:
dividing a first quasi-component corresponding to the base oil according to each component of the base oil, wherein the first quasi-component comprises: n is a radical of2、CO2、C1O、C2O、C3O、C4O、C5O、C6O、C7O+；
Dividing a second pseudo-component corresponding to the condensate gas according to each component of the condensate gas, wherein the second pseudo-component comprises: n is a radical of2、CO2、C1Q、C2Q、C3Q、C4Q、C5Q、C6Q、C7Q+；
Obtaining a third pseudo-component from the first pseudo-component and the second pseudo-component, the third pseudo-component comprising: n is a radical of2、CO2、C1O、C2O、C3O、C4O、C5O、C6O、C7O+、C1Q、C2Q、C3Q、C4Q、C5Q、C6Q、C7Q+；
Combining the third quasi-components to obtain the quasi-components: n is a radical of2、CO2、C1Q、C2Q、C34Q、C56Q、C7Q+、C1O、C2O、C34O、C56O、C7O+。
In a specific embodiment of the invention, the N in the pseudo component corresponding to the base oil is determined according to the molar content of each component in the base oil2、CO2、C1O、C2O、C34O、C56O、C7O+Comprises the following components in percentage by mole:
obtaining the first pseudo component according to the molar content of each component in the base oil: n is a radical of2、CO2、C1O、C2O、C3O、C4O、C5O、C6O、C7O+The molar content of (a);
determining N in the quasi-component corresponding to the base oil according to the molar content of the first quasi-component2、CO2、C1O、C2O、C34O、C56O、C7O+In a molar ratio of (A), wherein said C34OIs equal to said C3OAnd C4OSum of molar contents of C, C56OIs equal to said C5OAnd C6OSum of the molar contents of (a).
In a specific embodiment of the invention, N in the pseudo-component corresponding to the condensate gas is determined according to the molar content of each component in the condensate gas2、CO2、C1Q、C2Q、C34Q、C56Q、C7Q+Comprises the following components in percentage by mole:
obtaining the second pseudo-component according to the molar content of each component in the condensate gas: n is a radical of2、CO2、C1Q、C2Q、C3Q、C4Q、C5Q、C6Q、C7Q+The molar content of (a);
determining N in the quasi-component corresponding to the condensate gas according to the molar content of the second quasi-component2、CO2、C1Q、C2Q、C34Q、C56Q、C7Q+In a molar ratio of (A), wherein said C34QIs equal to said C3QAnd C4QSum of molar contents of C, C56QIs equal to said C5QAnd C6QSum of the molar contents of (a).
In a specific embodiment of the present invention, the phase fitting of the base oil according to the molar contents of the pseudo component and the pseudo component corresponding to the base oil includes:
calculating to obtain critical parameters of the quasi-components corresponding to the bottom oil according to the molar content of the quasi-components corresponding to the bottom oil;
and performing phase state fitting according to the critical parameters and the molar content of the quasi-components corresponding to the base oil.
In a specific embodiment of the present invention, the phase fitting of the condensate gas according to the molar contents of the pseudo component and the pseudo component corresponding to the condensate gas includes:
calculating to obtain critical parameters of the quasi-components corresponding to the condensate gas according to the molar content of the quasi-components corresponding to the condensate gas;
and performing phase state fitting according to the critical parameters and the molar content of the quasi-components corresponding to the condensate gas.
In a specific embodiment of the present invention, the critical parameters include: critical temperature, critical pressure, critical compressibility factor, asymmetry factor, and critical volume.
In a specific embodiment of the invention, the critical parameter of the pseudo-component is calculated by a molar average method.
In a specific embodiment of the present invention, critical parameters and molar contents of pseudo components corresponding to the base oil or the condensate gas are subjected to pressure-volume-temperature PVT phase state fitting.
According to the phase state fitting method of the condensate gas reservoir with the bottom oil, provided by the invention, the simulated components are divided through the components of the bottom oil and the condensate gas, and the simulated components comprise: n is a radical of2、CO2、C1Q、C2Q、C34Q、C56Q、C7Q+、C1O、C2O、C34O、C56O、C7O+And determining N in the simulated components corresponding to the base oil according to the molar content of each component in the base oil2、CO2、C1O、C2O、C34O、C56O、C7O+Wherein C in the pseudo component corresponding to the base oil1Q、C2Q、C34Q、C56Q、C7Q+The molar content of (A) is zero; root of herbaceous plantDetermining N in the pseudo-components corresponding to the condensate gas according to the molar content of each component in the condensate gas2、CO2、C1Q、C2Q、C34Q、C56Q、C7Q+Wherein C is in the pseudo-component corresponding to the condensate gas1O、C2O、C34O、C56O、C7O+The method has the advantages that the molar content of the base oil and the condensate gas is zero, the base oil and the condensate gas are subjected to phase fitting according to the molar content of the quasi-components corresponding to the quasi-components, the base oil and the condensate gas, and the accuracy of phase description of the base oil and the condensate gas is improved.
Drawings
FIG. 1 is a fitted curve between oil viscosity and pressure fitted by a prior art method;
FIG. 2 is a fitted curve between oil density and pressure fitted by a prior art method;
FIG. 3 is a fitted curve between oil density and pressure fitted by the present invention;
FIG. 4 is a fitted curve between oil viscosity and pressure fitted by the present invention;
FIG. 5 is a fitted curve between the amount of retrograde condensate and the pressure fitted in accordance with the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment, a certain gas reservoir is taken as an example, the gas reservoir has the buried depth of 3240-3340 m, the length of a gas-containing well section is 75.8-97.0 m, and the comprehensive analysis of dynamic and static data proves that the gas reservoir is a condensate gas reservoir with bottom oil, the altitude of an original oil-gas interface is-1440 m, the altitude of an oil-water interface is-1480 m, and the original pressure is 39.4 MPa.
In this embodiment, when performing phase-state simulation on the condensate gas reservoir with bottom oil, the method includes the following steps:
step 1): respectively obtaining bottom oil and condensate gas from a gas reservoir, and respectively determining the molar content of each component in the bottom oil and the condensate gas, wherein each component in the bottom oil and the condensate gas comprises: n is a radical of2、CO2、C1、C2、C3、C4、C5、C6And C7+；
In this embodiment, a bottom oil sample and a condensate gas sample are obtained by sampling the top and the bottom of a gas reservoir, wherein the sampling results show that the top is condensate gas and the bottom is volatile oil, and then the condensate gas sample and the bottom oil sample are subjected to component determination, respectively2、CO2、C1、C2、C3、C4、C5、C6And C7+Wherein, C1、C2、C3、C4、C5、C6Respectively being methane, ethane, propane, butane, pentane, hexane, C7+The paraffin is alkane with the carbon number more than or equal to 7, wherein the measurement results of the mole percentage content of each component of the bottom oil and the condensate gas are shown in the table 1:
TABLE 1 mol% of the components of the condensate gas and the base oil according to the invention
As can be seen from Table 1, C4Including an IC4(Isobutane) and NC4(n-butane), C5Including an IC5(isopentane) and NC5(n-pentane).
Step 2): dividing the oil slurry into a plurality of components according to the components of the base oil and the condensate gasA composition, the quasi-composition comprising: n is a radical of2、CO2、C1Q、C2Q、C34Q、C56Q、C7Q+、C1O、C2O、C34O、C56O、C7O+。
In this embodiment, the quasi-components obtained from the components of the base oil and the condensate gas are specifically:
dividing a first quasi-component corresponding to the base oil according to each component of the base oil, wherein the first quasi-component comprises: n is a radical of2、CO2、C1O、C2O、C3O、C4O、C5O、C6O、C7O+；
Dividing a second pseudo-component corresponding to the condensate gas according to each component of the condensate gas, wherein the second pseudo-component comprises: n is a radical of2、CO2、C1Q、C2Q、C3Q、C4Q、C5Q、C6Q、C7Q+；
Obtaining a third pseudo-component from the first pseudo-component and the second pseudo-component, the third pseudo-component comprising: n is a radical of2、CO2、C1O、C2O、C3O、C4O、C5O、C6O、C7O+、C1Q、C2Q、C3Q、C4Q、C5Q、C6Q、C7Q+；
Combining the third quasi-components to obtain the quasi-components: n is a radical of2、CO2、C1Q、C2Q、C34Q、C56Q、C7Q+、C1O、C2O、C34O、C56O、C7O+。
In this example, the molar content of the pseudo-components of the base oil was determined from the molar content of the base oil components in table 1 and the molar content of the pseudo-components of the condensate was determined from the molar content of the condensate components in table 1, specifically, for the base oil, the molar content of the first pseudo-component (i.e., N) was first obtained from the molar content of each component in the base oil2、CO2、C1O、C2O、C3O、C4O、C5O、C6O、C7O+Molar content of (b), in this example, the molar content of the first pseudo component (i.e., N)2、CO2、C1O、C2O、C3O、C4O、C5O、C6O、C7O+Molar content of) and the molar content of each component of the base oil (N)2、CO2、C1、C2、C3、C4、C5、C6、C7+Mole content of) are correspondingly equal, and thus, N in the third pseudo-component of the base oil2、CO2、C1O、C2O、C3O、C4O、C5O、C6O、C7O+Is determined and the remaining C in the third pseudo-component of the base oil1Q、C2Q、C3Q、C4Q、C5Q、C6Q、C7Q+The molar content of the component was set to 0.
Correspondingly, for the condensate, the molar content of the second pseudo-component (i.e. N) is first obtained from the molar content of the components in the condensate2、CO2、C1Q、C2Q、C3Q、C4Q、C5Q、C6Q、C7Q+Molar content of (b), in this example, the molar content of the second pseudo component (i.e., N)2、CO2、C1Q、C2Q、C3Q、C4Q、C5Q、C6Q、C7Q+Mole content of) and the mole content of each component of the condensate (N of the condensate)2、CO2、C1、C2、C3、C4、C5、C6、C7+Mole content of) are correspondingly equal, and therefore, N in the third pseudo-component of the condensate gas2、CO2、C1Q、C2Q、C3Q、C4Q、C5Q、C6Q、C7Q+Is determined and the residual C in the pseudo-component of the condensate gas1O、C2O、C3O、C4O、C5O、C6O、C7O+The molar content of the components was set to 0, and the molar content of the third pseudo-component of the base oil and the molar content of the third pseudo-component of the condensate gas are shown in table 2:
TABLE 2 pseudo-component partitioning achievement table for gas reservoir base oil and condensate gas
Then, the pseudo components in table 2 (i.e., the third pseudo component) were combined to obtain pseudo components: n is a radical of2、CO2、C1Q、C2Q、C34Q、C56Q、C7Q+、C1O、C2O、C34O、C56O、C7O+Wherein, when combined, C34OIs equal to C3OAnd C4OSum of molar contents of C56OIs equal to C5OAnd C6OSum of molar contents of C34QIs equal to C3QAnd C4QSum of molar contents of C56QIs equal to C5QAnd C6QSum of molar contents of (A) and N in the pseudo component2、CO2、C1Q、C2Q、C7Q+、C1O、C2O、C7O+Molar content of (D) and N in Table 22、CO2、C1Q、C2Q、C7Q+、C1O、C2O、C7O+The base oil, wherein the pseudo components of the base oil and the molar percentages and molecular weights corresponding to the pseudo components are shown in table 3, and the pseudo components of the condensate gas and the molar percentages and molecular weights corresponding to the pseudo components are shown in table 4.
As can be seen from tables 3 and 4, C in the bottoms and condensate1、C2、C3、C4、C5、C6Has a molecular weight of (A) that is not very different, but C7+The difference in molecular weight between the base oil and the condensate gas is large, C7+Molecular weight in base oil 225.3, C7+The molecular weight in the condensate is 159.78.
TABLE 3 parameter Table of pseudo-components of base oils
TABLE 4 Parametric Table of pseudo components of condensate
Step 3): and performing phase state fitting on the base oil and the condensate gas according to the molar contents of the quasi-components corresponding to the quasi-components, the base oil and the condensate gas.
In this embodiment, when the base oil is fitted, the critical parameters of the quasi-components corresponding to the base oil are obtained by calculating according to the molar content of the quasi-components corresponding to the base oil, where the calculated critical parameters of the base oil are shown in table 5. When the condensate gas is fitted, firstly, the critical parameters of the quasi-components corresponding to the condensate gas are calculated according to the molar content of the quasi-components corresponding to the condensate gas, wherein the calculated critical parameters of the condensate gas are shown in table 6.
TABLE 5 Critical parameters of base oils
TABLE 6 gas condensate critical parameters table
And performing pressure-volume-temperature (PVT) phase fitting according to the critical parameters and molar contents calculated in the above tables 5 and 6, and specifically, during fitting, forming complete PVT fitting data by using a phase simulation analysis software Winprop.
In order to compare the fitting combination with the results measured in the actual experiment, in this embodiment, the obtained samples of the bottom oil and the condensate are measured through related experiments such as a differential separation experiment, an isochoric failure experiment, an isocomponent expansion experiment and the like, wherein experimental data of the bottom oil is shown in table 7, experimental results of the condensate are shown in table 8, fitting results obtained when the bottom oil is fitted by using the present invention are shown in table 9 and fig. 3-4, fitting results obtained when the condensate is fitted by using the present invention are shown in table 10 and fig. 5, and fig. 3 is a fitting curve between oil density and pressure fitted by using the present invention; fig. 4 is a fitted curve between oil viscosity and pressure fitted by the present invention, and fig. 5 is a fitted curve between the amount of retrograde condensate and pressure fitted by the present invention.
TABLE 7 bottom oil test data sheet
Table 8 gas condensate experimental data table
TABLE 9 results of the present invention base oil crude oil Density and crude oil viscosity
TABLE 10 fitting results of the volume of retrograde condensate in condensate gas of the present invention
As seen from table 9 and fig. 3 to 4, the error between the oil density fitting data of the base oil and the experimental data is within 2%, and the error between the oil viscosity fitting data of the base oil and the experimental data is within 5%, and as seen from table 10 and fig. 5, the error between the fitting data of the volume of the retrograde condensate in the condensate gas and the experimental data is within 5%, where the volume of the retrograde condensate in fig. 5 is the volume of the retrograde condensate.
In this embodiment, a set of PVT equations is used for fitting, it should be noted that the PVT equations are state description equations known to those skilled in the art, which may be specifically referred to in the prior art, and are not described in detail in this embodiment.
For comparison, in this example, the molar contents of the components of the base oil and the condensate gas measured in step 1) were fitted according to the method of the prior art, wherein the results of the component division of the base oil and the condensate gas by the prior art are shown in table 11:
TABLE 11 present Table of division results of bottom oil and condensate gas pseudo-components of gas reservoir
As can be seen from table 11 and tables 2 to 3, the existing quasi-component classification is greatly different from the quasi-component classification of the present invention, and the present invention creates a phase fitting method for the bottoming oil condensate gas reservoir by changing the existing component classification method.
Fitting the base oil and the condensate gas according to the pseudo components and the corresponding molar contents in table 11, wherein the fitting results of the base oil crude density and the crude oil viscosity are shown in table 12 and fig. 1-2, and fig. 1 is a fitting curve between the oil viscosity and the pressure fitted by the prior art method; FIG. 2 is a graph of the fit between oil density and pressure as fitted by a prior art method.
Table 12 table of results of prior art method fitting to crude oil density and crude oil viscosity in base oil
As shown in table 12 and fig. 1-2, in the conventional method, when phase state changes of the bottom oil and the condensate gas are fitted by using a set of PVT equations, errors between the crude oil density and crude oil viscosity of the bottom oil and experimental data are 18.01% -86.11%, but in the present invention, the errors are within 5%, the accuracy is high, fluid properties can be accurately described regardless of gas channeling or oil invasion, the fluid phase state can be accurately described, and the method has a very important significance for predicting the remaining oil-gas distribution and developing scheme compilation7+Molecular weight of (A) can only take one value, but C7+The molecular weights in the base oil and the condensate gas are greatly different, so that the fitting data have larger errors in the fitting process, and in the invention, C is included in the quasi-component division7Q+And C7O+When fitting base oil, C7Q+Is set to be zero, and C is adopted in calculation7O+Molar content and molecular weight of (225.3), C when condensate gas is fitted7O+Is set to be zero, and C is adopted in calculation7Q+And molecular weight (159.78), such that different molecular weights are used in the fitting process, resulting in more accurate fitting results.
The phase state fitting method of the condensate gas reservoir with the bottom oil provided by the invention realizes the simultaneous fitting of the phase state changes of the bottom oil and the condensate gas by using a set of PVT equations by changing the existing simulation component division method, and the fitting method provided by the invention has high accuracy, has an error within 5 percent, and can accurately describe the same changes of the bottom oil and the condensate gas.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A phase fitting method for a condensate gas reservoir with bottom oil, the method comprising:
respectively obtaining bottom oil and condensate gas from a gas reservoir, and respectively determining the molar content of each component in the bottom oil and the condensate gas, wherein each component in the bottom oil and the condensate gas comprises: n is a radical of2、CO2、C1、C2、C3、C4、C5、C6And C7+；
Dividing quasi-components according to the components of the base oil and the condensate gas, wherein the quasi-components comprise: n is a radical of2、CO2、C1Q、C2Q、C34Q、C56Q、C7Q+、C1O、C2O、C34O、C56O、C7O+And determining N in the simulated components corresponding to the base oil according to the molar content of each component in the base oil2、CO2、C1O、C2O、C34O、C56O、C7O+Wherein C in the pseudo component corresponding to the base oil1Q、C2Q、C34Q、C56Q、C7Q+The molar content of (A) is zero; determining N in the pseudo-components corresponding to the condensate gas according to the molar content of each component in the condensate gas2、CO2、C1Q、C2Q、C34Q、C56Q、C7Q+Wherein C is in the pseudo-component corresponding to the condensate gas1O、C2O、C34O、C56O、C7O+The molar content of (A) is zero;
and performing phase state fitting on the base oil according to the molar contents of the quasi-components and the quasi-components corresponding to the base oil, and performing phase state fitting on the condensate gas according to the molar contents of the quasi-components and the quasi-components corresponding to the condensate gas.
2. The method of claim 1, wherein the partitioning of pseudo-components according to the respective components of the base oil and the condensate gas comprises:
dividing a first quasi-component corresponding to the base oil according to each component of the base oil, wherein the first quasi-component comprises: n is a radical of2、CO2、C1O、C2O、C3O、C4O、C5O、C6O、C7O+；
Dividing a second pseudo-component corresponding to the condensate gas according to each component of the condensate gas, wherein the second pseudo-component comprises: n is a radical of2、CO2、C1Q、C2Q、C3Q、C4Q、C5Q、C6Q、C7Q+；
Obtaining a third pseudo-component from the first pseudo-component and the second pseudo-component, the third pseudo-component comprising: n is a radical of2、CO2、C1O、C2O、C3O、C4O、C5O、C6O、C7O+、C1Q、C2Q、C3Q、C4Q、C5Q、C6Q、C7Q+；
Combining the third quasi-components to obtain the quasi-components: n is a radical of2、CO2、C1Q、C2Q、C34Q、C56Q、C7Q+、C1O、C2O、C34O、C56O、C7O+。
3. The method according to claim 2, wherein the N in the pseudo-component corresponding to the base oil is determined according to the molar content of each component in the base oil2、CO2、C1O、C2O、C34O、C56O、C7O+Comprises the following components in percentage by mole:
obtaining the first pseudo component according to the molar content of each component in the base oil: n is a radical of2、CO2、C1O、C2O、C3O、C4O、C5O、C6O、C7O+The molar content of (a);
determining N in the quasi-component corresponding to the base oil according to the molar content of the first quasi-component2、CO2、C1O、C2O、C34O、C56O、C7O+In a molar ratio of (A), wherein said C34OIs equal to said C3OAnd C4OSum of molar contents of C, C56OIs equal to said C5OAnd C6OSum of the molar contents of (a).
4. The method according to claim 2, characterized in that the N in the pseudo-component corresponding to the condensate gas is determined according to the molar content of each component in the condensate gas2、CO2、C1Q、C2Q、C34Q、C56Q、C7Q+Comprises the following components in percentage by mole:
obtaining the second pseudo-component according to the molar content of each component in the condensate gas: n is a radical of2、CO2、C1Q、C2Q、C3Q、C4Q、C5Q、C6Q、C7Q+The molar content of (a);
determining N in the quasi-component corresponding to the condensate gas according to the molar content of the second quasi-component2、CO2、C1Q、C2Q、C34Q、C56Q、C7Q+In a molar ratio of (A), wherein said C34QIs equal to said C3QAnd C4QSum of molar contents of C, C56QIs equal to said C5QAnd C6QSum of the molar contents of (a).
5. The method according to claim 1, wherein the phase fitting of the base oil according to the molar contents of the quasi-components and the quasi-components corresponding to the base oil comprises:
calculating to obtain critical parameters of the quasi-components corresponding to the bottom oil according to the molar content of the quasi-components corresponding to the bottom oil;
and performing phase state fitting according to the critical parameters and the molar content of the quasi-components corresponding to the base oil.
6. The method according to claim 1, wherein said phase fitting said condensate gas according to the molar contents of said pseudo-components and the pseudo-components corresponding to said condensate gas comprises:
calculating to obtain critical parameters of the quasi-components corresponding to the condensate gas according to the molar content of the quasi-components corresponding to the condensate gas;
and performing phase state fitting according to the critical parameters and the molar content of the quasi-components corresponding to the condensate gas.
7. The method according to claim 5 or 6, wherein the critical parameters comprise: critical temperature, critical pressure, critical compressibility factor, asymmetry factor, and critical volume.
8. The method according to claim 5 or 6, characterized in that the critical parameters of the pseudo-components are calculated by means of a molar average method.
9. The method according to claim 5 or 6, characterized in that the pressure-volume-temperature PVT phase fit is performed according to critical parameters and molar contents of pseudo-components corresponding to the base oil or the condensate gas.
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