CN114544918A - Evaluation method and device for sealing performance of crude oil cracking gas reservoir - Google Patents
Evaluation method and device for sealing performance of crude oil cracking gas reservoir Download PDFInfo
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Abstract
The invention discloses a method and a device for evaluating the sealing performance of a crude oil cracking gas reservoir, wherein the method comprises the following steps: obtaining stratum parameters and actual measurement data of a crude oil cracking gas reservoir to be measured, wherein the stratum parameters comprise: formation temperature data and formation pressure data, the measured data comprising: density data and gas deviation coefficients, the density data comprising: crude oil density data under ground standard conditions, core bitumen density data, ground degassed crude oil relative density data and separator gas relative density data; determining the volume coefficient of the crude oil according to the formation temperature data, the relative density data of the ground degassed crude oil and the relative density data of the gas of the separator; determining the cracking rate of crude oil according to formation parameters, crude oil density data under the ground standard condition, core asphalt density data, gas deviation coefficient and crude oil volume coefficient; and (4) evaluating the sealing performance of the crude oil cracking gas reservoir according to the cracking rate of the crude oil. The method can evaluate the sealing performance of the crude oil cracking gas reservoir and improve the reliability and accuracy of the evaluation result.
Description
Technical Field
The invention relates to the technical field of geology of oil and gas reservoirs, in particular to a method and a device for evaluating the sealing performance of a crude oil cracking gas reservoir.
Background
The geology of the oil and gas reservoir is the core of the geology of the oil and gas reservoir and is a branch subject for researching the formation and distribution rules of the oil and gas reservoir in the geology of the oil and gas reservoir. The research content comprises basic elements or conditions of formation of the oil and gas reservoir, chronology of the reservoir, geochemistry of the reservoir, dynamics of the reservoir, the formation and distribution rule of the oil and gas reservoir and the like. It is an independent branch subject in petroleum geology in parallel with petroleum structure geology, organic geochemistry, reservoir geology, development geology and the like. The research content of the reservoir formation geology comprises static reservoir formation elements, dynamic reservoir formation processes, effects and final reservoir formation results, and relates to various aspects of generation, transportation, accumulation, preservation and the like which influence the formation and distribution of the oil and gas reservoir.
The cracking rate of crude oil refers to the mass of crude oil minus the residue in the total mass under geological conditions, that is, the mass of gas generated by cracking crude oil is the percentage of the total mass of crude oil. The calculated crude oil cracking rate can be compared with the theoretical cracking rate to judge the gas reservoir sealing property. The determination that the reserves of the kerogen pyrolysis gas and the crude oil pyrolysis gas at the high evolution stage at the present stage account for more than 26 percent of the total reserves. Deep crude oil pyrolysis gas generally exists in an old carbonate rock stratum, and recognition of a gas source, reservoir storage capacity, a reservoir formation process and the like becomes a key problem for restricting exploration. How the gas reservoir sealing performance is, the method has important significance for understanding the reservoir formation process and evaluating the scale of ancient oil and gas reservoirs.
In the prior art, evaluation of the sealing performance of a crude oil cracking gas reservoir is mainly carried out through fault sealing evaluation and cover sealing evaluation. The methods are not only complex in operation but also belong to indirect evaluation methods, and the reliability and accuracy of the evaluation result are difficult to ensure. Therefore, a solution for evaluating the sealing performance of a crude oil cracking gas reservoir, which can overcome the above problems, is needed.
Disclosure of Invention
The embodiment of the invention provides a method for evaluating the sealing performance of a crude oil cracking gas reservoir, which is used for evaluating the sealing performance of the crude oil cracking gas reservoir and improving the reliability and accuracy of an evaluation result, and comprises the following steps:
obtaining stratum parameters and actually measured data of a crude oil cracking gas reservoir to be detected, wherein the stratum parameters comprise: formation temperature data and formation pressure data, the measured data comprising: density data and gas deviation coefficients, the density data comprising: crude oil density data under ground standard conditions, core bitumen density data, ground degassed crude oil relative density data and separator gas relative density data;
determining the volume coefficient of crude oil according to the formation temperature data, the relative density data of the ground degassed crude oil and the relative density data of the separator gas;
determining the cracking rate of crude oil according to the stratum parameters, crude oil density data under the ground standard condition, core asphalt density data, gas deviation coefficient and crude oil volume coefficient;
and evaluating the sealing performance of the crude oil cracking gas reservoir according to the crude oil cracking rate.
The embodiment of the invention provides a device for evaluating the sealing performance of a crude oil cracking gas reservoir, which is used for evaluating the sealing performance of the crude oil cracking gas reservoir and improving the reliability and accuracy of an evaluation result, and comprises the following components:
the data acquisition module is used for acquiring stratum parameters and measured data of the crude oil cracking gas reservoir to be detected, wherein the stratum parameters comprise: formation temperature data and formation pressure data, the measured data comprising: density data and gas deviation coefficients, the density data comprising: crude oil density data under ground standard conditions, core bitumen density data, ground degassed crude oil relative density data and separator gas relative density data;
the volume coefficient determining module is used for determining the volume coefficient of the crude oil according to the formation temperature data, the relative density data of the ground degassed crude oil and the relative density data of the gas of the separator;
the cracking rate determining module is used for determining the cracking rate of the crude oil according to the stratum parameters, the crude oil density data under the ground standard condition, the rock core asphalt density data, the gas deviation coefficient and the crude oil volume coefficient;
and the evaluation module is used for evaluating the sealing performance of the crude oil cracking gas reservoir according to the crude oil cracking rate.
The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the evaluation method for the sealing performance of the crude oil cracking gas reservoir.
Embodiments of the present invention also provide a computer-readable storage medium storing a computer program for executing the above evaluation method for crude oil pyrolysis gas reservoir sealing performance.
Compared with the scheme of evaluating the sealing performance of the crude oil cracking gas reservoir through fault sealing evaluation and cover sealing evaluation in the prior art, the method and the device have the advantages that the formation parameters and the measured data of the crude oil cracking gas reservoir to be measured are obtained, and the formation parameters comprise: formation temperature data and formation pressure data, the measured data comprising: density data and gas deviation coefficients, the density data comprising: crude oil density data under ground standard conditions, core bitumen density data, ground degassed crude oil relative density data and separator gas relative density data; determining the volume coefficient of the crude oil according to the formation temperature data, the relative density data of the ground degassed crude oil and the relative density data of the gas of the separator; determining the cracking rate of crude oil according to the stratum parameters, crude oil density data under the ground standard condition, core asphalt density data, gas deviation coefficient and crude oil volume coefficient; and evaluating the sealing performance of the crude oil cracking gas reservoir according to the crude oil cracking rate. According to the embodiment of the invention, after the formation parameters and the measured data of the crude oil cracked gas reservoir to be measured are obtained, the volume coefficient of crude oil is determined according to the formation temperature data, the ground degassed crude oil relative density data and the separator gas relative density data, and then the crude oil cracking rate is determined by combining the formation parameters, the crude oil density data under the ground standard condition, the rock core asphalt density data and the gas deviation coefficient, and the crude oil cracking rate can directly and quantitatively reflect the natural gas scattering degree, so that the judgment of the gas reservoir sealing performance can be realized according to the natural gas scattering degree, indirect measurement and calculation are not needed, and the reliability and the accuracy of an evaluation result are effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
FIG. 1 is a schematic diagram of a method for evaluating the sealing performance of a crude oil cracking gas reservoir in an embodiment of the invention;
FIG. 2 is a schematic diagram of a method for evaluating the sealing performance of a crude oil cracking gas reservoir in an embodiment of the invention;
FIG. 3 is a schematic diagram of a crude oil pyrolysis gas reservoir sealing performance evaluation apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a crude oil pyrolysis gas reservoir sealing performance evaluation apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a computer device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
As described above, in the prior art, evaluation of the sealing performance of a crude oil pyrolysis gas reservoir is mainly performed by fault sealing evaluation and cap sealing evaluation. The methods are not only complex in operation but also belong to indirect evaluation methods, and the reliability and accuracy of the evaluation result are difficult to ensure. Specifically, the inventors found that the following disadvantages exist: (1) the methods all belong to indirect methods, and cannot be directly evaluated through the temperature and pressure state of the existing natural gas reservoir; (2) in the cover layer closure evaluation research, the diffusion effect of natural gas is mainly considered, the established mathematical equation is expressed in a calculus form, the calculation is complex, the calculation cannot be carried out manually, and the calculation can be realized only by compiling professional software; (3) the evaluation results are semi-quantitative, and the strength of the natural gas reservoir closure cannot be quantitatively determined; (4) no quantitative judgment method specially aiming at the carbonate crude oil cracking gas reservoir sealing property exists so far.
In order to evaluate the sealing performance of a crude oil cracking gas reservoir and improve the reliability and accuracy of an evaluation result, an embodiment of the present invention provides a method for evaluating the sealing performance of a crude oil cracking gas reservoir, as shown in fig. 1, the method may include:
102, determining a volume coefficient of crude oil according to the formation temperature data, the relative density data of the ground degassed crude oil and the relative density data of the gas of the separator;
103, determining the cracking rate of the crude oil according to the stratum parameters, the crude oil density data under the ground standard condition, the core asphalt density data, the gas deviation coefficient and the crude oil volume coefficient;
and 104, evaluating the sealing performance of the crude oil cracking gas reservoir according to the crude oil cracking rate.
As shown in fig. 1, in the embodiment of the present invention, formation parameters and measured data of a crude oil cracked gas reservoir to be measured are obtained, where the formation parameters include: formation temperature data and formation pressure data, the measured data comprising: density data and gas deviation coefficients, the density data comprising: crude oil density data under ground standard conditions, core bitumen density data, ground degassed crude oil relative density data and separator gas relative density data; determining the volume coefficient of the crude oil according to the formation temperature data, the relative density data of the ground degassed crude oil and the relative density data of the gas of the separator; determining the cracking rate of crude oil according to the stratum parameters, crude oil density data under the ground standard condition, core asphalt density data, gas deviation coefficient and crude oil volume coefficient; and evaluating the sealing performance of the crude oil cracking gas reservoir according to the crude oil cracking rate. According to the embodiment of the invention, after the formation parameters and the measured data of the crude oil cracked gas reservoir to be measured are obtained, the volume coefficient of crude oil is determined according to the formation temperature data, the ground degassed crude oil relative density data and the separator gas relative density data, and then the crude oil cracking rate is determined by combining the formation parameters, the crude oil density data under the ground standard condition, the rock core asphalt density data and the gas deviation coefficient, and the crude oil cracking rate can directly and quantitatively reflect the natural gas scattering degree, so that the judgment of the gas reservoir sealing performance can be realized according to the natural gas scattering degree, indirect measurement and calculation are not needed, and the reliability and the accuracy of an evaluation result are effectively improved.
In specific implementation, formation parameters and actual measurement data of a crude oil cracking gas reservoir to be measured are obtained, wherein the formation parameters comprise: formation temperature data and formation pressure data, the measured data comprising: density data and gas deviation coefficients, the density data comprising: crude oil density data under surface standard conditions, core bitumen density data, surface degassed crude oil relative density data, and separator gas relative density data.
In the embodiment, a crude oil sample cannot be obtained after the crude oil of the gas reservoir to be detected is cracked, crude oil generated by the same type of hydrocarbon source rock is selected as a research object according to the type of the hydrocarbon source rock of the gas reservoir, and the density of the crude oil is measured under the ground standard condition, so that crude oil density data rho under the ground standard condition is obtainedoIn units of g/m3. Wherein the standard ground condition is 293k and 0.101 MPa.
In the examples, the production is measured according to the gas reservoirFormation parameters may be obtained from the test results or the reserve reports, and include: formation temperature data T and formation pressure data Pi。
In the embodiment, a proper amount of asphalt is obtained in a gas reservoir coring well to be measured, so that the density of the asphalt is measured, and the density data rho of the core asphalt is obtainedb。
In the examples, the gas deviation coefficient was obtained as follows: the method comprises the steps of utilizing a high-pressure physical property PVT cylinder to measure the volume of natural gas under the condition of constant temperature and pressure of the gas reservoir, then placing the natural gas on the ground under a standard condition to measure the volume of the natural gas, and calculating the original gas deviation coefficient Z of the gas reservoir according to a state equation of the gasi. Wherein the standard ground condition is 293k and 0.101 MPa.
In specific implementation, the volume coefficient of the crude oil is determined according to the formation temperature data, the relative density data of the ground degassed crude oil and the relative density data of the gas of the separator.
In an embodiment, determining a crude oil volume factor based on the formation temperature data, the surface degassed crude oil relative density data, and the separator gas relative density data comprises: and determining the volume coefficient of the crude oil according to the formation temperature data, the relative density data of the ground degassed crude oil, the gas relative density data of the separator, the dissolved gas-oil ratio data and a preset empirical formula.
In this example, the volume factor B of crude oiloiDefined as the volume V of crude oil in the groundf(i.e. volume of formation oil) and its volume after degassing at surface VsThe preset empirical formula can adopt a standard empirical formula, and the volume coefficient B of the crude oil is determined according to the formation temperature data, the relative density data of the ground degassed crude oil, the relative density data of the gas of the separator, the dissolved gas-oil ratio data and the preset empirical formulaoi：
Wherein Rs is dissolved gas-oil ratio data, Ro is ground degassed crude oil relative density data, and Rg is separatorRelative gas density data, air density 1.0kg/m3And T is formation temperature data which is read according to the depth of the ancient oil reservoir determined by the burial history and has the unit of K.
In specific implementation, the crude oil cracking rate is determined according to the stratum parameters, crude oil density data under the ground standard condition, core asphalt density data, gas deviation coefficient and crude oil volume coefficient.
In an embodiment, determining the crude oil cracking rate according to the formation parameters, the crude oil density data under the ground standard conditions, the core bitumen density data, the gas deviation coefficient and the crude oil volume coefficient comprises: and determining the crude oil cracking rate according to the stratum parameters, the crude oil density data, the rock core asphalt density data, the gas deviation coefficient and the crude oil volume coefficient under the ground standard condition and a pre-established crude oil cracking rate calculation model, wherein the crude oil cracking rate calculation model is pre-established according to a preset geological model and a mass conservation law.
In this example, the crude oil cracking rate calculation model was previously established as follows:
firstly, presetting a geological model as follows: 1. the natural gas of the existing gas reservoir is the natural gas generated after petroleum cracking, and no cheese root is generated; 2. the gas reservoir area of the ancient carbonate rock constant volume system is equal to the original oil reservoir area.
Then, according to the requirements of a petroleum and natural gas control reserve calculation method (Q/SY 179-2006), the oil and gas reserve calculation adopts a volumetric method to calculate the geological reserve. The calculation formula is as follows:
Bgi＝(Psc×Zi×T)/(Pi×Tsc) (4)
wherein G is dayGeological reserve of natural gas, unit is m3Ag is the gas-containing area in m2N is petroleum geological reserve in m3H is the effective thickness in m,
effective porosity, decimal fraction, SgiIs the original gas saturation, decimal, SoiIs the original oil saturation, decimal, BgiIs the volume coefficient of the original natural gas without dimension, BoiIs crude oil volume coefficient, dimensionless, PscIs ground standard pressure in MPa, ZiIs the deviation coefficient of the original gas, T is the formation temperature and has the unit of K and Pi0.101MPa, T, of the original formation pressurescStandard temperature at ground level, 293K.
The effective porosity of the original reservoir differs from the porosity of the existing gas reservoir, which is the greater porosity than the original reservoir, due to the bitumen filling in the pores of the existing gas reservoir
Is small. Assuming that the residual porosity of the gas reservoir is
Then the geological reserves of natural gas in the current gas-bearing area are:
further, according to the density ρ of natural gas under the ground standard conditiongIn units of kg/m3The mass (in kg) of the gas reservoir natural gas is:
converting the natural gas mass into the crude oil mass before cracking according to the cracking rate and mass conservation principle:
Mo＝Mg/Xm (7)
wherein Mo is the mass of the crude oil, the unit is kg, Xm is the cracking rate of the crude oil, namely the parameter required by the invention, and the unit is decimal. Substituting equation (6) into equation (7) yields:
according to the formula (3), the geological reserves of the original ancient oil reservoir can be obtained as follows:
wherein S isoiIs the original oil saturation, decimal, rhooThe density in kg/m of the crude oil in the standard ground conditions3Mo is the mass of crude oil in kg, and for simplification, S is setoi＝SgiAnd the old reservoir area is equal to the area of the present gas reservoir, i.e., Ag ═ Ao, then:
furthermore, after the crude oil in the reservoir is cracked, the total mass of the remaining residues, i.e. bitumen, is:
wherein Ms is the residual weight of crude oil after cracking and is expressed in kg, V is the total volume of the reservoir and is expressed in m3。
In addition, the total weight of bitumen in the pores of the reservoir, in terms of volume and density of bitumen, is:
wherein Mb is the reservoirTotal weight of bitumen in the pores in kg, total volume of the V reservoir in m3，ρbIs the density of the asphalt in kg/m3。
According to the conservation of mass, the weight of the bitumen in the pores is equal to the residual weight of the crude oil after cracking, i.e.: ms — Mb, and further, can be obtained:
after finishing, the following can be obtained:
then, by combining equation (8) and equation (10), it is possible to obtain:
finishing to obtain:
substituting the formula (4) and the formula (14) into the formula (16), and obtaining a crude oil cracking rate calculation model after finishing:
wherein Xm is the cracking rate of crude oil and represents the percentage of the total mass of generated natural gas to the mass of crude oil, BoiIs the volume coefficient of crude oil, pgThe density of the natural gas under the ground standard condition is 0.667kg/m3，ρoIs crude oil density data under ground standard conditions, and the unit is kg/m3，ρbThe core asphalt density data is in kg/m3，ZiIs a gas deviation coefficient, PscIs the ground standard pressure of 0.101MPa, and T is the formation temperature data with the unit of K and PiIs formation pressure data in MPa, TscStandard temperature at ground level, 293K.
In specific implementation, evaluation on the sealing performance of the crude oil cracking gas reservoir is carried out according to the crude oil cracking rate.
In the examples, as shown in fig. 2, the evaluation of the crude oil cracking gas reservoir sealing performance according to the crude oil cracking rate of fig. 1 comprises the following steps: 104a, obtaining a cracking rate theoretical value, and calculating a difference value between the cracking rate of the crude oil and the cracking rate theoretical value; and 104b, evaluating the sealing performance of the crude oil cracking gas reservoir according to the difference value.
In this embodiment, theoretically, the cracking rate of crude oil is 40%, that is, the theoretical value of the cracking rate is 40%, the closer the calculation result is to the theoretical value, the better the sealing performance is, the smaller the calculation result is, the worse the sealing performance is, and thus the dispersion amount of natural gas is further calculated. Therefore, the difference value between the cracking rate of the crude oil and the theoretical cracking rate is calculated, a threshold value can be set, the difference value is compared with the set threshold value, and the sealing performance is evaluated according to the comparison result.
The embodiment of the invention effectively overcomes the limitations and the defects of the existing technology for evaluating the gas reservoir sealing performance, and quantitatively calculates the cracking rate of crude oil in the research process of the geological dynamic reservoir formation and reservoir formation results of the reservoir formation so as to judge the sealing performance of the gas reservoir. The reliability and the accuracy of the calculation result are improved, and the practicability is stronger. The invention has the advantages of simple structure, reasonable design, strong practicability, low manufacturing cost and the like.
Based on the same inventive concept, the embodiment of the invention also provides a device for evaluating the sealing performance of the crude oil cracking gas reservoir, which is described in the following embodiment. Because the principle of solving the problems is similar to the evaluation method of the sealing performance of the crude oil cracking gas reservoir, the implementation of the device can refer to the implementation of the method, and repeated parts are not described again.
Fig. 3 is a block diagram of an evaluation apparatus for crude oil pyrolysis gas reservoir sealing performance according to an embodiment of the present invention, and as shown in fig. 3, the apparatus includes:
the data obtaining module 301 is configured to obtain formation parameters and actual measurement data of a crude oil cracked gas reservoir to be detected, where the formation parameters include: formation temperature data and formation pressure data, the measured data comprising: density data and gas deviation coefficients, the density data comprising: crude oil density data under ground standard conditions, core bitumen density data, ground degassed crude oil relative density data and separator gas relative density data;
a volume coefficient determination module 302 for determining a crude oil volume coefficient based on the formation temperature data, the relative density data of the ground degassed crude oil, and the relative density data of the separator gas;
the cracking rate determining module 303 is used for determining the cracking rate of the crude oil according to the formation parameters, the crude oil density data under the ground standard condition, the core bitumen density data, the gas deviation coefficient and the crude oil volume coefficient;
and the evaluation module 304 is used for evaluating the sealing performance of the crude oil cracking gas reservoir according to the crude oil cracking rate.
In one embodiment, the volume coefficient determination module 302 is further configured to:
and determining the volume coefficient of the crude oil according to the formation temperature data, the relative density data of the ground degassed crude oil, the gas relative density data of the separator, the dissolved gas-oil ratio data and a preset empirical formula.
In one embodiment, the cracking rate determination module 303 is further configured to:
and determining the crude oil cracking rate according to the stratum parameters, the crude oil density data, the rock core asphalt density data, the gas deviation coefficient and the crude oil volume coefficient under the ground standard condition, and a pre-established crude oil cracking rate calculation model, wherein the crude oil cracking rate calculation model is pre-established according to a preset geological model and a mass conservation law.
In one embodiment, as shown in fig. 4, the evaluation module 304 of fig. 3 further comprises:
the difference value calculating unit 304a is used for obtaining a cracking rate theoretical value and calculating the difference value between the cracking rate of the crude oil and the cracking rate theoretical value;
and the evaluation unit 304b is used for evaluating the sealing performance of the crude oil cracking gas reservoir according to the difference.
In summary, in the embodiments of the present invention, formation parameters and actual measurement data of a crude oil cracked gas reservoir to be measured are obtained, where the formation parameters include: formation temperature data and formation pressure data, the measured data comprising: density data and gas deviation coefficients, the density data comprising: crude oil density data under ground standard conditions, core bitumen density data, ground degassed crude oil relative density data and separator gas relative density data; determining the volume coefficient of the crude oil according to the formation temperature data, the relative density data of the ground degassed crude oil and the relative density data of the gas of the separator; determining the cracking rate of crude oil according to the stratum parameters, crude oil density data under the ground standard condition, core asphalt density data, gas deviation coefficient and crude oil volume coefficient; and evaluating the sealing performance of the crude oil cracking gas reservoir according to the crude oil cracking rate. According to the embodiment of the invention, after the formation parameters and the measured data of the crude oil cracked gas reservoir to be measured are obtained, the volume coefficient of crude oil is determined according to the formation temperature data, the ground degassed crude oil relative density data and the separator gas relative density data, and then the crude oil cracking rate is determined by combining the formation parameters, the crude oil density data under the ground standard condition, the rock core asphalt density data and the gas deviation coefficient, and the crude oil cracking rate can directly and quantitatively reflect the natural gas scattering degree, so that the judgment of the gas reservoir sealing performance can be realized according to the natural gas scattering degree, indirect measurement and calculation are not needed, and the reliability and the accuracy of an evaluation result are effectively improved.
Based on the aforementioned inventive concept, as shown in fig. 5, the present invention further provides a computer device 500, which includes a memory 510, a processor 520, and a computer program 530 stored on the memory 510 and operable on the processor 520, wherein the processor 520 executes the computer program 530 to implement the aforementioned method for determining the amount of return of oil and gas drilling cuttings.
Based on the foregoing inventive concept, the present invention proposes a computer-readable storage medium storing a computer program which, when executed by a processor, implements the aforementioned method for determining an amount of return of oil and gas drilling cuttings.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for evaluating the sealing performance of a crude oil cracking gas reservoir is characterized by comprising the following steps:
obtaining stratum parameters and actually measured data of a crude oil cracking gas reservoir to be detected, wherein the stratum parameters comprise: formation temperature data and formation pressure data, the measured data comprising: density data and gas deviation coefficients, the density data comprising: crude oil density data under ground standard conditions, core bitumen density data, ground degassed crude oil relative density data and separator gas relative density data;
determining the volume coefficient of crude oil according to the formation temperature data, the relative density data of the ground degassed crude oil and the relative density data of the separator gas;
determining the cracking rate of crude oil according to the stratum parameters, crude oil density data under the ground standard condition, core asphalt density data, gas deviation coefficient and crude oil volume coefficient;
and evaluating the sealing performance of the crude oil cracking gas reservoir according to the crude oil cracking rate.
2. The method of evaluating the seal-off performance of a crude oil pyrolysis gas reservoir of claim 1 wherein determining the crude oil volume factor based on the formation temperature data, the surface degassed crude oil relative density data, and the separator gas relative density data comprises:
and determining the volume coefficient of the crude oil according to the formation temperature data, the relative density data of the ground degassed crude oil, the gas relative density data of the separator, the dissolved gas-oil ratio data and a preset empirical formula.
3. The method for evaluating the sealing performance of the crude oil cracking gas reservoir as claimed in claim 1, wherein the determining of the crude oil cracking rate according to the formation parameters, the crude oil density data under the ground standard condition, the core bitumen density data, the gas deviation coefficient and the crude oil volume coefficient comprises:
and determining the crude oil cracking rate according to the stratum parameters, the crude oil density data, the rock core asphalt density data, the gas deviation coefficient and the crude oil volume coefficient under the ground standard condition and a pre-established crude oil cracking rate calculation model, wherein the crude oil cracking rate calculation model is pre-established according to a preset geological model and a mass conservation law.
4. The method for evaluating the sealing performance of a crude oil cracking gas reservoir according to claim 1, wherein the evaluation of the sealing performance of the crude oil cracking gas reservoir according to the crude oil cracking rate comprises:
obtaining a cracking rate theoretical value, and calculating the difference value of the cracking rate of the crude oil and the cracking rate theoretical value;
and evaluating the sealing performance of the crude oil cracking gas reservoir according to the difference value.
5. A crude oil pyrolysis gas reservoir sealing performance evaluation device is characterized by comprising:
the data acquisition module is used for acquiring formation parameters and actual measurement data of the crude oil cracking gas reservoir to be detected, wherein the formation parameters comprise: formation temperature data and formation pressure data, the measured data comprising: density data and gas deviation coefficients, the density data comprising: crude oil density data under ground standard conditions, core bitumen density data, ground degassed crude oil relative density data and separator gas relative density data;
the volume coefficient determining module is used for determining the volume coefficient of the crude oil according to the formation temperature data, the relative density data of the ground degassed crude oil and the relative density data of the gas of the separator;
the cracking rate determining module is used for determining the cracking rate of the crude oil according to the stratum parameters, the crude oil density data under the ground standard condition, the rock core asphalt density data, the gas deviation coefficient and the crude oil volume coefficient;
and the evaluation module is used for evaluating the sealing performance of the crude oil cracking gas reservoir according to the crude oil cracking rate.
6. The crude oil pyrolysis gas reservoir seal performance evaluation apparatus of claim 5 wherein the volume factor determination module is further configured to:
and determining the volume coefficient of the crude oil according to the formation temperature data, the relative density data of the ground degassed crude oil, the gas relative density data of the separator, the dissolved gas-oil ratio data and a preset empirical formula.
7. The crude oil pyrolysis gas reservoir seal performance evaluation apparatus of claim 5 wherein the cracking rate determination module is further configured to:
and determining the crude oil cracking rate according to the stratum parameters, the crude oil density data, the rock core asphalt density data, the gas deviation coefficient and the crude oil volume coefficient under the ground standard condition and a pre-established crude oil cracking rate calculation model, wherein the crude oil cracking rate calculation model is pre-established according to a preset geological model and a mass conservation law.
8. The crude oil pyrolysis gas reservoir seal performance evaluation apparatus of claim 5 wherein the evaluation module further comprises:
the difference calculation unit is used for obtaining a cracking rate theoretical value and calculating the difference between the cracking rate of the crude oil and the cracking rate theoretical value;
and the evaluation unit is used for evaluating the sealing performance of the crude oil cracking gas reservoir according to the difference value.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 4 when executing the computer program.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 4.
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