CN111861026B - Method for rapidly acquiring minimum miscible phase pressure of Subei continental phase oil field - Google Patents
Method for rapidly acquiring minimum miscible phase pressure of Subei continental phase oil field Download PDFInfo
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- CN111861026B CN111861026B CN202010740977.2A CN202010740977A CN111861026B CN 111861026 B CN111861026 B CN 111861026B CN 202010740977 A CN202010740977 A CN 202010740977A CN 111861026 B CN111861026 B CN 111861026B
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- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
Abstract
The invention relates to a method for quickly acquiring the minimum miscible pressure of a Subei continental phase oil field, which comprises the following steps: step 1), obtaining oil reservoir temperatures under different oil reservoir conditions according to the oil reservoir depth and by combining drilling data; step 2), obtaining crude oil components; analyzing former light hydrocarbon and C8-C40 alkane compound in the crude oil by using gas chromatography; separating each component of the crude oil by a gas chromatograph to obtain the peak area of each component, and obtaining the mass fraction, wax percentage content and mol percentage content of each component in the crude oil by utilizing area normalization and adding an internal standard substance (isooctane); and 3) obtaining the minimum miscible pressure. According to the invention, the minimum miscible phase pressure of the Subei continental facies reservoir can be effectively and rapidly obtained under three conditions that only the temperature influence is considered, only the crude oil component temperature influence is considered, and simultaneously the temperature and the crude oil component influence are considered.
Description
Technical Field
The invention relates to a method for quickly acquiring minimum miscible pressure of a new block of a Subei continental phase oil field, and belongs to the technical field of oil gas experiments in a CO2 displacement development scheme in the petroleum industry.
Background
Most oil fields in China are continental deposits, and are seriously heterogeneous, and the viscosity of crude oil is high. For such fields, the water flooding recovery rate is very low, and the comprehensive water content of the current waterflood development is up to more than 90%. Therefore, the development of enhanced oil recovery techniques is imminent.
The minimum miscible phase pressure is used as an important reference for measuring miscible phase and immiscible phase of the carbon dioxide flooding, and becomes one of important research subjects for improving the recovery ratio of the carbon dioxide flooding. Since the minute tube experiment for determining the minimum miscible pressure was proposed by Stalkup in 1983, it is a widely recognized and commonly used method for determining the minimum miscible pressure and the minimum miscible composition at home and abroad, and has been used as a standard method for determining the minimum miscible pressure. But it takes the longest time and is very expensive.
In China, the research on the minimum miscible pressure is very limited because the gas injection development technology is not completely scaled. In developing gas injection enhancements to yield, only a few methods for determining MMP have been used-empirical equations and tubule experiments. In the southwest institute of Petroleum and the institute of exploration and development, capillary experiments were mainly used to determine MMP. In 1963, when a CO2 drive pilot test is firstly carried out in Daqing oil field, MMP (metal matrix metalloproteinase) has been researched, and a relatively proper empirical formula is selected for calculation mainly aiming at the special oil reservoir characteristics of the Daqing oil field. In the victory oil field, the influence factors of MMP are researched by Caoshan and an empirical formula suitable for MMP in the victory oil field is provided. These empirical formulas are derived experimentally from MMP data and fit based on these data, based only on the actual conditions of some fields. Since these empirical formulas are closely related to the actual characteristics of the reservoir, applicability is limited.
The method selects the representative reservoir samples of the Subei continental facies oil field, comprehensively analyzes basic data such as crude oil components, minimum miscible pressure and the like, summarizes an empirical formula of the minimum miscible pressure, combines indoor experiments with numerical simulation, and researches a prediction formula of the minimum miscible pressure suitable for the Subei block. Various factors influencing MMP are analyzed, different factors can generate different influence researches on MMP, a new method for calculating MMP is provided through binomial fitting of key influencing factors, and the research method can be widely applied to development of new blocks of old oil fields.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for quickly acquiring the minimum miscible phase pressure of the Subei continental phase oil field.
The invention aims to realize the method for quickly acquiring the minimum miscible pressure of the Subei continental phase oil field, which is characterized by comprising the following steps of:
step 1), obtaining oil reservoir temperatures under different oil reservoir conditions according to oil reservoir depths and by combining drilling data;
step 2), obtaining crude oil components;
analyzing former light hydrocarbon and C8-C40 alkane compound in the crude oil by using gas chromatography;
separating each component of the crude oil by a gas chromatograph to obtain the peak area of each component, and obtaining the mass fraction, wax percentage content and mol percentage content of each component in the crude oil by utilizing area normalization and adding an internal standard substance (isooctane);
and 3) establishing a regression model to obtain the minimum miscible pressure. Combining the reservoir temperature obtained in step 1), only considering the temperature effect, using the following formula:
Pmm＝4*10-5*T3-0.0145*T2+1.8097*T-52.49
wherein P ismmIs the minimum miscible pressure in MPa; t is the oil reservoir temperature in units of;
considering only the influence of crude oil components, the following formula is used
Pmm＝5*10-4*MAverage-0.3551*MAverage-39.189
Wherein P ismmIs the minimum miscible pressure in units of ℃; mAverage outThe mass fraction average value of each component in the crude oil is shown;
simultaneously considering the influence of temperature and crude oil components, the following formula is used:
Pmm＝0.003072*T2+1.1292*T+1.92*10-4*M2 average+1.536*10-3*MAverage+0.2823MAverage-76.182
Wherein P ismmIs the minimum miscible pressure in MPa; t is the oil reservoir temperature in units of; mAverageIs the average value of the mass fractions of various components in the crude oil.
The method is advanced and scientific, and according to the method, the temperatures under different oil reservoir conditions are obtained by combining drilling data according to the oil reservoir depth. And secondly, obtaining crude oil components, and analyzing former light hydrocarbons and C8-C40 alkane compounds in the crude oil by using gas chromatography. And (3) separating each component of the crude oil by using a gas chromatograph to obtain the peak area of each component, and obtaining the mass fraction, wax percentage and mole percentage of each component in the sample by utilizing area normalization and adding an internal standard substance (isooctane).
In the calculation, the following formula is used to obtain the minimum miscible pressure by considering the temperature influence:
Pmm＝4*10-5*T3-0.0145*T2+1.8097*T-52.49
wherein P ismmIs the minimum miscible pressure in MPa; t is the reservoir temperature in deg.C, which is a formula applicable to lower formation temperatures, such as marine reservoirs.
The minimum miscible pressure is obtained taking into account the influence of the temperature of the crude oil components, using the following formula:
Pmm＝5*10-4*Maverage-0.3551*MAverage-39.189
Wherein P ismmIs the minimum miscible pressure in units of ℃; mAverageThe formula is an average value of the mass fractions of various components in the crude oil, and is suitable for continental reservoirs with higher formation temperature and larger heavy hydrocarbon components.
Simultaneously, the influence of temperature and crude oil components is considered, the minimum miscible pressure is obtained, and the following formula is used:
Pmm＝0.003072*T2+1.1292*T+1.92*10-4*M2 average+1.536*10-3*MAverage+0.2823MAverage-76.182
Wherein P ismmIs the minimum miscible pressure in MPa; t is the oil reservoir temperature in units of; mAverageIs the average value of the mass fractions of various components in the crude oil. The formula can be generally applied to continental-phase reservoirs with higher formation temperature and larger medium hydrocarbon components.
The data used for formula fitting of the invention is from the Subei continental facies oil field, the crude oil has the characteristics of medium density and high viscosity, and the ground crude oil density is 0.8568g/cm3-0.9100g/cm3Viscosity of 11.2-335.23 mPa.s, wax content of 15.31-28.3%, freezing point of 34-43.5 deg.C; the sulfur content is 0.34-0.83%. The natural gas is dissolved gas in crude oil, the hydrocarbon gas component is mainly methane, and the specific gravity of natural gas in the funning group and natural gas in the tay zhou group is between 0.85 and 1.0. The hydrocarbon component is mainly medium hydrocarbon and has high wax. Combining with the capillary experimental data, processing the data by using a binomial formula, wherein the specific gravity of the natural gas is between 0.85 and 1.0. The hydrocarbon component is mainly medium hydrocarbon and has high wax. Substituting the research well into different fitting formulas, and comparing the errors of the different fitting formulasTo find out: (1) only considering the temperature, the lower the temperature, the smaller the error of fitting; (2) only considering the molecular weight, the larger the molecular weight, the smaller the error of fitting; (3) the overall fit is less error considering temperature and molecular weight.
And substituting the data into the well data of the same block for verification in order to verify the feasibility of the fitting formula. According to the comparison, the error value is 11.54% according to the temperature fitting formula; according to a molecular weight fitting formula, the error value is 5.55 percent; according to the temperature and the crude oil component conditions, the minimum miscible pressure value and the actual measured value are obtained by predicting the empirical formula, the deviation is 0.04%, the minimum miscible pressure value can be well predicted by the formula, and preliminary reference is provided for oil reservoir development.
The invention has the beneficial effects that: compared with the traditional mode, the scheme provided by the invention can effectively and quickly acquire the minimum miscible phase pressure of the oil field in the northeast China continental phase under three conditions of considering temperature influence, considering crude oil component temperature influence and simultaneously considering temperature and crude oil component influence.
Detailed Description
A method for rapidly acquiring the minimum miscible pressure of a Subei continental phase oil field is characterized by comprising the following steps:
step 1), selecting a specific oil reservoir, and obtaining oil reservoir temperatures under different oil reservoir conditions according to oil reservoir depth and by combining drilling data;
step 2), obtaining crude oil components;
analyzing former light hydrocarbon and C8-C40 alkane compound in the crude oil by using gas chromatography;
separating each component of the crude oil by a gas chromatograph to obtain the peak area of each component, and obtaining the mass fraction, wax percentage content and mol percentage content of each component in the crude oil by utilizing area normalization and adding an internal standard substance (isooctane);
and 3) carrying out numerical fitting to obtain the minimum miscible pressure.
According to the oil reservoir characteristics of the Subei block, combining the step 1), considering the temperature influence, the following formula is used:
Pmm＝4*10-5*T3-0.0145*T2+1.8097*T-52.49
wherein P ismmIs the minimum miscible pressure in MPa; t is the oil reservoir temperature in units of;
the minimum miscible pressure is calculated by considering the influence of crude oil components, and the following formula is used
Pmm＝5*10-4*MAverage-0.3551*MAverage-39.189
Wherein P ismmIs the minimum miscible pressure in units of ℃; m is a group ofAverageThe mass fraction average value of each component in the crude oil is shown;
meanwhile, the influence of temperature and crude oil components is considered, the minimum miscible pressure is obtained through calculation, and the following formula is used:
Pmm＝0.003072*T2+1.1292*T+1.92*10-4*M2 average+1.536*10-3*MAverage+0.2823MAverage-76.182
Wherein P ismmIs the minimum miscible pressure in MPa; t is the oil reservoir temperature in units of; mAverageIs the average value of the mass fractions of various components in the crude oil.
Claims (1)
1. A method for rapidly acquiring minimum miscible phase pressure of a Subei continental oil field is characterized by comprising the following steps:
step 1), obtaining oil reservoir temperatures under different oil reservoir conditions according to oil reservoir depths and by combining drilling data;
step 2), obtaining crude oil components;
analyzing former light hydrocarbon and C8-C40 alkane compound in the crude oil by using gas chromatography;
separating each component of the crude oil by a gas chromatograph to obtain the peak area of each component, and obtaining the mass fraction of each component in the crude oil by utilizing area normalization and adding an internal standard substance isooctane;
step 3), obtaining the minimum miscible phase pressure and only considering the temperature influence, and combining the oil reservoir temperature obtained in the step 1), using the following formula:
Pmm＝4*10-5*T3-0.0145*T2+1.8097*T-52.49
wherein P ismmIs the minimum miscible pressure in MPa; t is the oil reservoir temperature in units of;
the minimum miscible pressure is obtained only by considering the influence of crude oil components, and the following formula is used
Pmm＝-5×10-4MAverage+0.3551MAverage-39.189
Wherein P ismmIs the minimum miscible pressure in units of ℃; mAverage outThe mass fraction average value of each component in the crude oil is shown;
obtaining the minimum miscible pressure while considering the temperature, crude oil composition effects, using the following formula:
wherein P ismmIs the minimum miscible pressure in MPa; t is the oil reservoir temperature and the unit is; mAverageIs the average value of the mass fractions of various components in the crude oil.
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