CN111474098A - Method and device for determining volume of miscible phase zone in sandstone reservoir - Google Patents
Method and device for determining volume of miscible phase zone in sandstone reservoir Download PDFInfo
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Abstract
The invention provides a method and a device for determining the volume of a heterogeneous zone in a sandstone reservoir, which comprise the following steps: acquiring the diameter, the length, the porosity and the permeability of a target reservoir core; calculating the pore volume of the target reservoir rock core according to the diameter, the length and the porosity of the target reservoir rock core; performing a long core displacement experiment on the target reservoir core according to the pore volume of the target reservoir core, and determining the gas injection quantity and the displacement pressure of the target reservoir core; and inputting the gas injection quantity, the displacement pressure and the permeability of the target reservoir core into the miscible zone volume empirical model so that the miscible zone volume empirical model outputs the miscible zone volume in the sandstone reservoir. The method for determining the volume of the miscible phase zone in the sandstone reservoir improves the accuracy of determining the miscible phase zone.
Description
Technical Field
The invention relates to the field of oil exploitation, in particular to a method and a device for determining the volume of a miscible phase zone in a sandstone reservoir.
Background
The gas injection oil displacement is an effective method for improving the crude oil recovery rate of a sandstone reservoir, particularly the gas injection miscible phase flooding, because the interfacial tension is almost infinitely close to 0, the residual oil saturation of the reservoir is obviously reduced, the microcosmic oil displacement efficiency is more than 90 percent, and the oil reservoir recovery rate is greatly improved. The gas injection miscible flooding is adopted to improve the recovery ratio after the water flooding of the sandstone reservoir, and the size and the volume of the miscible zone in the reservoir are the key for predicting the future production dynamics, so that the determination of the volume of the miscible zone in the reservoir has important significance for the gas injection development of the sandstone reservoir.
The existing method for determining the volume of the miscible phase zone in the reservoir of the sandstone reservoir is based on a single-phase liquid stable seepage theory, and the volume of the miscible phase zone is calculated by establishing a mathematical model.
However, the numerical simulation method does not consider the influence of the actual reservoir, the determined volume of the miscible phase zone is different from the actual reservoir, and the accuracy of determining the volume of the miscible phase zone is not high.
Disclosure of Invention
The invention provides a method and a device for determining the volume of a miscible phase zone in a sandstone reservoir, which are used for improving the accuracy of determining the volume of the miscible phase zone.
The invention provides a method for determining the volume of a miscible zone in a sandstone reservoir, which comprises the following steps:
acquiring the diameter, the length, the porosity and the permeability of a target reservoir core;
calculating the pore volume of the target reservoir core according to the diameter, the length and the porosity of the target reservoir core;
performing a long core displacement experiment on the target reservoir core according to the pore volume of the target reservoir core, and determining the gas injection quantity and the displacement pressure of the target reservoir core;
inputting the gas injection quantity, the displacement pressure and the permeability of the target reservoir core into the multiphase belt volume empirical model so that the multiphase belt volume empirical model outputs the multiphase belt volume in the sandstone reservoir.
Optionally, before the obtaining of the diameter, the length, the porosity and the permeability of the target reservoir core, the method further includes:
acquiring the diameters, the lengths, the porosities and the permeabilities of a plurality of training reservoir cores;
respectively calculating the pore volumes corresponding to the training reservoir cores according to the diameters, the lengths and the porosities of the plurality of training reservoir cores, and taking the pore volumes corresponding to the training reservoir cores as the injection volumes of the long core displacement experiment;
and respectively carrying out a plurality of long core displacement experiments by using a plurality of injection volumes to determine a miscible phase zone volume empirical model, wherein the plurality of injection volumes are different pairwise.
Optionally, the determining the miscible zone volume empirical model by performing a plurality of long core displacement experiments using a plurality of injection volumes respectively includes:
respectively carrying out a plurality of long core displacement experiments by using a plurality of injection volumes to obtain the oil outlet volume and the water outlet volume in the plurality of long core displacement experiments;
respectively determining the oil displacement efficiency in the multiple long core displacement experiments according to the oil outlet volume and the water outlet volume in the multiple long core displacement experiments;
determining a relation curve of gas injection quantity, displacement pressure and permeability and miscible volume ratio according to oil displacement efficiency in a plurality of long core displacement experiments;
carrying out nonlinear fitting on the relationship curves of the gas injection quantity, the displacement pressure and the permeability and the proportion of the miscible volume respectively to determine the reference coefficient of the miscible zone volume empirical model;
and determining a volume empirical model of the miscible band corresponding to the reference coefficient.
Optionally, determining the oil displacement efficiency in the multiple long core displacement experiments respectively according to the oil outlet volume and the water outlet volume in the multiple long core displacement experiments includes:
using the formula n as 100% × Vo1/(Vo-Vo1) Respectively calculating the oil displacement efficiency of the plurality of training reservoir rock cores;
wherein n is the oil displacement efficiency of the reservoir core, Vo1Volume of oil produced, VoIs the volume of the effluent.
Optionally, calculating the pore volume of the reservoir core according to the diameter, the length, and the porosity of the reservoir core includes:
using a formula
Calculating the pore volume of the reservoir core;
wherein V is the void volume of the reservoir core, D is the diameter of the reservoir core, L is the length of the reservoir core,
is the porosity of the reservoir core.
Optionally, the empirical model of the volume of the mixed-phase zone is Vm ═ V × [ a × P + b × Gi + c × 10 ═ V-5(linK)d-e]；
Wherein, VmThe volume of a miscible phase zone in a sandstone reservoir stratum, V is the void volume of a reservoir core, GiFor gas injection amount and P for displacementPressure, K is permeability, and a, b, c, d and e are miscible band volume reference coefficients.
A second aspect of the present invention provides an apparatus for determining the volume of a miscible zone in a reservoir of a sandstone reservoir, comprising:
the first acquisition module is used for acquiring the diameter, the length, the porosity and the permeability of a target reservoir core;
the first calculation module is used for calculating the pore volume of the target reservoir core according to the diameter, the length and the porosity of the target reservoir core;
the first determination module is used for performing a long core displacement experiment on the target reservoir core according to the pore volume of the target reservoir core, and determining the gas injection quantity and the displacement pressure of the target reservoir core;
and the model operation module is used for inputting the gas injection quantity, the displacement pressure and the permeability of the target reservoir core into the multiphase zone volume empirical model so as to enable the multiphase zone volume empirical model to output the multiphase zone volume in the sandstone reservoir.
Optionally, the method further includes:
the second acquisition module is used for acquiring the diameters, the lengths, the porosities and the permeabilities of the multiple training reservoir cores;
the second calculation module is used for respectively calculating the pore volumes corresponding to the training reservoir cores according to the diameters, the lengths and the porosities of the plurality of training reservoir cores and taking the pore volumes corresponding to the training reservoir cores as the injection volumes of the long core displacement experiment;
and the model determining module is used for performing multiple long core displacement experiments by using multiple injection volumes respectively to determine a miscible phase zone volume empirical model, wherein the multiple injection volumes are different pairwise.
Optionally, the model determining module includes:
the volume acquisition unit is used for respectively carrying out a plurality of long core displacement experiments by using a plurality of injection volumes, and acquiring the oil outlet volume and the water outlet volume in the plurality of long core displacement experiments;
the oil displacement efficiency determining unit is used for respectively determining the oil displacement efficiency in the long core displacement experiments for a plurality of times according to the oil outlet volume and the water outlet volume in the long core displacement experiments for a plurality of times;
the relation curve determining unit is used for determining a relation curve of gas injection quantity, displacement pressure and permeability and the proportion of miscible phase volume according to oil displacement efficiency in a plurality of long core displacement experiments;
the fitting unit is used for carrying out nonlinear fitting on the relation curves of the gas injection quantity, the displacement pressure and the permeability and the proportion of the miscible volume respectively to determine the reference coefficient of the miscible zone volume empirical model;
and the model generation unit is used for determining a mixed phase zone volume empirical model corresponding to the reference coefficient.
Optionally, the oil displacement efficiency determining unit is specifically configured to adopt a formula n of 100% × Vo1/(Vo-Vo1) Respectively calculating the oil displacement efficiency of the plurality of training reservoir rock cores;
wherein n is the oil displacement efficiency of the reservoir core, Vo1Volume of oil produced, VoIs the volume of the effluent.
Optionally, the first calculating module is specifically configured to adopt a formula
Calculating the pore volume of the reservoir core;
wherein V is the void volume of the reservoir core, D is the diameter of the reservoir core, L is the length of the reservoir core, and phi is the porosity of the reservoir core.
Optionally, the empirical model of the volume of the mixed-phase zone is Vm ═ V × [ a × P + b × Gi + c × 10 ═ V-5(linK)d-e]；
Wherein, VmThe volume of a miscible phase zone in a sandstone reservoir stratum, V is the void volume of a reservoir core, GiIs the gas injection amount, P is the displacement pressure, K is the permeability, and a, b, c, d and e are the miscible band volume reference coefficients.
A third aspect of the present invention provides an electronic apparatus comprising: a memory and a processor;
the memory for storing executable instructions of the processor;
the processor is configured to perform the method referred to in the first aspect and alternatives thereof via execution of the executable instructions.
In a fourth aspect of the present invention, there is provided a storage medium having stored thereon a computer program which, when executed by a processor, implements the method of the first aspect and its alternatives.
According to the method and the device for determining the volume of the miscible zone in the reservoir stratum of the sandstone reservoir, provided by the invention, the diameter, the length, the porosity and the permeability of the core of the target reservoir stratum are obtained, the void volume is calculated according to the diameter, the length and the porosity of the core of the target reservoir stratum, a long core displacement experiment is carried out according to the void volume to determine the gas injection quantity and the displacement pressure, and finally, the permeability, the gas injection quantity and the displacement pressure are input into an experience model of the volume of the miscible zone to determine the volume of the miscible zone. The volume of the miscible phase zone in the reservoir can be accurately determined by combining the difference with the actual reservoir through the miscible phase zone volume empirical model.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for determining the volume of a miscible zone in a reservoir zone of a sandstone reservoir according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of another method for determining the volume of a miscible zone in a reservoir of a sandstone reservoir according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of step S27 according to the embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus for determining the volume of a miscible zone in a reservoir zone of a sandstone reservoir according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another apparatus for determining the volume of a miscible zone in a reservoir of a sandstone reservoir according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a model determining module according to an embodiment of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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 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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The terms "first," "second," and the like in the description of the invention and the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.
It should be understood that, in various embodiments of the present invention, the sequence numbers of the processes do not mean the execution sequence, and the execution sequence of the processes should be determined by the functions and the internal logic of the processes, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
It should be understood that in the present application, "comprising" and "having" and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present invention, "B corresponding to a", "a corresponds to B", or "B corresponds to a" means that B is associated with a, from which B can be determined. Determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.
As used herein, "if" may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1 is a schematic flow chart of a method for determining the volume of a miscible zone in a reservoir zone of a sandstone reservoir according to an embodiment of the present invention.
The method can be executed by a determining device of the volume of the miscible phase zone in the reservoir of the sandstone reservoir, and optionally, the determining device of the volume of the miscible phase zone in the reservoir of the sandstone reservoir can be independently arranged or integrated in a processor.
Referring to fig. 1, a method for determining the volume of a miscible zone in a reservoir of a sandstone reservoir comprises the following steps:
s11: and acquiring the diameter, the length, the porosity and the permeability of the target reservoir core.
In practical application, reservoir cores collected from sandstone reservoir reservoirs can be cleaned and baked, and then the reservoir cores are measured, so that the diameter, the length, the permeability and the porosity of the reservoir cores are obtained.
S12: and calculating the pore volume of the target reservoir core according to the diameter, the length and the porosity of the target reservoir core.
Optionally, the oil displacement efficiency in the long core displacement experiment for multiple times is respectively determined according to the oil outlet volume and the water outlet volume in the long core displacement experiment for multiple times, and the method includes:
using a formula
Calculating the pore volume of the reservoir core;
wherein V is the void volume of the reservoir core, D is the diameter of the reservoir core, L is the length of the reservoir core,
is the porosity of the reservoir core.
S13: and performing a long core displacement experiment on the target reservoir core according to the pore volume of the target reservoir core, and determining the gas injection quantity and the displacement pressure of the target reservoir core.
In practical application, the associated gas, the formation crude oil and the formation water which are produced by an actual oil reservoir wellhead are firstly obtained when a long core displacement experiment is carried out; secondly, injecting formation water with the same pore volume as the target core; injecting condensate oil into the rock core from the inlet end of the target rock core until the outlet end of the rock core does not discharge water; then, injecting natural gas into the core from the inlet end of the target core at specified time intervals, and recording the gas injection amount; and finally, performing displacement at a set speed, and recording the displacement pressure of the target rock core.
In the concrete implementation process, when the condensate oil is injected into the target core, the accumulated water yield Vw can be recorded, the irreducible water saturation Swi and the initial oil saturation So in the core are calculated, the concrete calculation formula is that Swi is 100% × (V-Vw)/V and So is 100% × (1-Swi), wherein V is the pore volume, and when the displacement is carried out at the speed, the outlet volume V at the outlet end of the target core can be recordedg1Volume of oil produced Vo1And calculating the oil saturation in the target rock core, wherein the specific calculation formula is Soi＝100％×(Vo-Vol)/V。
S14: and inputting the gas injection quantity, the displacement pressure and the permeability of the target reservoir core into the miscible zone volume empirical model so that the miscible zone volume empirical model outputs the miscible zone volume in the sandstone reservoir.
In practical application, when the permeability of the core of a target reservoir is obtained, the pore volume of the core of the target reservoir is calculated, and the gas injection quantity and the displacement pressure are determined through a long core displacement experiment, the values can be directly input into the miscible zone volume empirical model, and the miscible zone volume empirical model outputs the miscible zone volume in the sandstone reservoir. Wherein the empirical model of the miscible zone volume is determined by repeatedly training the reservoir core.
Optionally, after the volume of the miscible zone of the target reservoir core is determined, the length of the miscible zone can be calculated, and the specific calculation formula is
L thereinmFor length of the phase-mixing zone, VmIs the volume of the miscible zone, D is the diameter of the reservoir core,
is the porosity of the reservoir core.
According to the method for determining the volume of the miscible zone in the reservoir of the sandstone reservoir, the diameter, the length, the porosity and the permeability of the core of the target reservoir are obtained, the void volume is calculated according to the diameter, the length and the porosity of the core of the target reservoir, long core displacement experiments are carried out according to the void volume to determine gas injection quantity and displacement pressure, and finally the permeability, the gas injection quantity and the displacement pressure are input into an experience model of the volume of the miscible zone to determine the volume of the miscible zone. By the aid of the miscible zone volume empirical model, the miscible zone volume in the reservoir can be accurately determined by combining the difference between the miscible zone volume and an actual reservoir when the miscible zone volume is determined.
Fig. 2 is a schematic flow chart of another method for determining the volume of the miscible zone in the reservoir of the sandstone reservoir according to the embodiment of the present invention.
Referring to fig. 2, a method for determining the volume of a miscible zone in a reservoir of a sandstone reservoir comprises:
s25: and acquiring the diameter, the length, the porosity and the permeability of the multiple training reservoir cores.
S26: and respectively calculating the pore volumes corresponding to the training reservoir cores according to the diameters, the lengths and the porosities of the plurality of training reservoir cores, and taking the pore volumes corresponding to the training reservoir cores as the injection volumes of the long core displacement experiment.
In practical application, before the miscible phase zone volume of the target reservoir core is determined, the diameters, lengths, porosities and permeabilities of a plurality of training reservoir cores may be measured according to steps S11-S122 of fig. 1, and the pore volume corresponding to each training reservoir core is calculated and used as the injection volume of the long core displacement experiment.
S27: and respectively carrying out a plurality of long core displacement experiments by using a plurality of injection volumes to determine a miscible phase zone volume empirical model, wherein the plurality of injection volumes are different pairwise.
In practical application, a long core displacement experiment can be performed on each training reservoir core according to the injection volume corresponding to the training reservoir core, the gas injection quantity, the displacement pressure and the permeability of each training reservoir core in the long core displacement experiment are recorded, the oil displacement efficiency corresponding to the training reservoir core is calculated, so that a relation curve of the gas injection quantity, the displacement pressure and the permeability and the miscible band volume ratio is obtained, and the miscible band volume empirical model is determined according to the relation curve.
S21: and acquiring the diameter, the length, the porosity and the permeability of the target reservoir core.
S22: and calculating the pore volume of the target reservoir core according to the diameter, the length and the porosity of the target reservoir core.
S23: and performing a long core displacement experiment on the target reservoir core according to the pore volume of the target reservoir core, and determining the gas injection quantity and the displacement pressure of the target reservoir core.
S24: and inputting the gas injection quantity, the displacement pressure and the permeability of the target reservoir core into the miscible zone volume empirical model so that the miscible zone volume empirical model outputs the miscible zone volume in the sandstone reservoir.
The technical terms, technical effects, technical features, and alternative embodiments of steps S21 through S24 can be understood with reference to steps S11 through S14 shown in fig. 1, and repeated contents will not be described herein.
Fig. 3 is a flowchart illustrating a step S27 according to an embodiment of the present invention.
Referring to fig. 3, step S27 includes:
s31: and respectively carrying out a plurality of long core displacement experiments by using a plurality of injection volumes to obtain the oil outlet volume and the water outlet volume in the plurality of long core displacement experiments.
In practical applications, reference may be made to a long core displacement experiment of the target reservoir core in step S13. The method comprises the steps of obtaining associated gas, formation crude oil and formation water produced by an actual oil reservoir wellhead, and injecting formation water with an injection volume corresponding to a training reservoir core into the core; injecting formation crude oil into a training reservoir core from a core inlet end until the core outlet end does not discharge water, and measuring the water discharge volume; and injecting natural gas into the core from the inlet end of the core of the training reservoir, and recording the oil outlet volume of the outlet end of the core.
S32: and respectively determining the oil displacement efficiency in the long core displacement experiments for multiple times according to the oil outlet volume and the water outlet volume in the long core displacement experiments for multiple times.
Optionally, the oil displacement efficiency in the long core displacement experiment for multiple times is respectively determined according to the oil outlet volume and the water outlet volume in the long core displacement experiment for multiple times, and the method includes:
using the formula n as 100% × Vo1/(Vo-Vo1) Respectively calculating the oil displacement efficiency of the plurality of training reservoir rock cores;
wherein n is the oil displacement efficiency of the reservoir core, Vo1Volume of oil produced, VoIs the volume of the effluent.
S33: and determining the relation curves of gas injection quantity, displacement pressure and permeability and the proportion of miscible volume according to the oil displacement efficiency in multiple long core displacement experiments.
In practical application, the miscible phase zone proportion can be determined according to the oil displacement efficiency, and then corresponding relation curves are drawn according to a plurality of groups of gas injection quantity, displacement pressure and permeability and miscible phase volume proportion data.
S34: and carrying out nonlinear fitting on the relationship curves of the gas injection quantity, the displacement pressure and the permeability and the proportion of the miscible volume respectively to determine the reference coefficient of the miscible zone volume empirical model.
S35: and determining a miscible band volume empirical model corresponding to the reference coefficient.
Optionally, the empirical model of the volume of the mixed-phase band is Vm ═ V × [ a × P + b × Gi + c × 10-5(linK)d-e]；
Wherein, VmThe volume of a miscible phase zone in a sandstone reservoir stratum, V is the void volume of a reservoir core, GiIs the gas injection amount, P is the displacement pressure, K is the permeability, and a, b, c, d and e are the miscible band volume reference coefficients.
According to the method for determining the volume of the miscible zone in the reservoir of the sandstone reservoir, the reservoir core is trained to determine the relation curves of gas injection quantity, displacement pressure and permeability and the proportion of the miscible zone volume, nonlinear fitting is carried out on the relation curves to determine the reference coefficient of an empirical model of the volume of the miscible zone, and then the empirical model of the volume of the miscible zone is determined to determine the volume of the miscible zone. By the aid of the miscible zone volume empirical model, the miscible zone volume in the reservoir can be accurately determined by combining the difference between the miscible zone volume and an actual reservoir when the miscible zone volume is determined.
Fig. 4 is a schematic structural diagram of a device for determining the volume of a miscible zone in a reservoir zone of a sandstone reservoir according to an embodiment of the present invention.
Referring to fig. 4, the apparatus for determining the volume of the miscible zone in the reservoir of a sandstone reservoir comprises:
the first obtaining module 41 is configured to obtain a diameter, a length, a porosity, and a permeability of the target reservoir core.
And the first calculation module 42 is configured to calculate a pore volume of the target reservoir core according to the diameter, the length, and the porosity of the target reservoir core.
Optionally, the first calculating module 42 is specifically configured to adopt a formula
Calculating the pore volume of the reservoir core;
wherein V is the void volume of the reservoir core, D is the diameter of the reservoir core, L is the length of the reservoir core,
is the porosity of the reservoir core.
And the first determining module 43 is configured to perform a long core displacement experiment on the target reservoir core according to the pore volume of the target reservoir core, and determine the gas injection amount and the displacement pressure of the target reservoir core.
And the model operation module 44 is used for inputting the gas injection quantity, the displacement pressure and the permeability of the target reservoir core into the miscible zone volume empirical model so that the miscible zone volume empirical model outputs the miscible zone volume in the sandstone reservoir.
Fig. 5 is a schematic structural diagram of another apparatus for determining the volume of a miscible zone in a reservoir of a sandstone reservoir according to an embodiment of the present invention.
Referring to fig. 5, the apparatus for determining the volume of the miscible zone in the reservoir of a sandstone reservoir comprises:
a second obtaining module 55, configured to obtain diameters, lengths, porosities, and permeabilities of the multiple training reservoir cores;
the second calculation module 56 is configured to calculate pore volumes corresponding to the training reservoir cores respectively according to the diameters, lengths and porosities of the multiple training reservoir cores, and use the pore volumes corresponding to the training reservoir cores as injection volumes of the long core displacement experiment;
and the model determining module 57 is configured to perform a plurality of long core displacement experiments using a plurality of injection volumes, respectively, to determine a miscible zone volume empirical model, where the plurality of injection volumes are different in pairs.
The first obtaining module 51 is used for obtaining the diameter, the length, the porosity and the permeability of the target reservoir core.
And the first calculation module 52 is configured to calculate a pore volume of the target reservoir core according to the diameter, the length, and the porosity of the target reservoir core.
The first determining module 53 is configured to perform a long core displacement experiment on the target reservoir core according to the pore volume of the target reservoir core, and determine the gas injection amount and the displacement pressure of the target reservoir core.
And the model operation module 54 is configured to input the gas injection amount, the displacement pressure and the permeability of the target reservoir core into the heterogeneous zone volume empirical model, so that the heterogeneous zone volume empirical model outputs the heterogeneous zone volume in the sandstone reservoir.
Fig. 6 is a schematic structural diagram of a model determining module according to an embodiment of the present invention.
Referring to fig. 6, the model determining module includes:
and the volume obtaining unit 61 is used for performing multiple long core displacement experiments respectively by using the multiple injection volumes, and obtaining the oil outlet volume and the water outlet volume in the multiple long core displacement experiments.
And the oil displacement efficiency determining unit 62 is used for respectively determining the oil displacement efficiency in the long core displacement experiments for a plurality of times according to the oil outlet volume and the water outlet volume in the long core displacement experiments for a plurality of times.
Optionally, the oil displacement efficiency determining unit 62 is specifically configured to adopt the formula n-100% × Vo1/(Vo-Vo1) Respectively calculating the oil displacement efficiency of the plurality of training reservoir rock cores;
wherein n is the oil displacement efficiency of the reservoir core, Vo1Volume of oil produced, VoIs the volume of the effluent.
And the relation curve determining unit 63 is configured to determine a relation curve between the gas injection amount, the displacement pressure and the permeability and the miscible volume ratio according to the oil displacement efficiency in the multiple long core displacement experiments.
And the fitting unit 64 is used for performing nonlinear fitting on the relationship curves of the gas injection quantity, the displacement pressure and the permeability and the proportion of the miscible volume respectively to determine the reference coefficient of the miscible zone volume empirical model.
A model generation unit 65 for determining a volumetric empirical model of the miscible band corresponding to the reference coefficients.
Optionally, the empirical model of the volume of the mixed-phase band is Vm ═ V × [ a × P + b × Gi + c × 10-5(linK)d-e]；
Wherein, VmFor sandstone reservoir reservoirsVolume of the medium miscible phase zone, V is the void volume of the core of the reservoir, GiIs the gas injection amount, P is the displacement pressure, K is the permeability, and a, b, c, d and e are the miscible band volume reference coefficients.
The device for determining the volume of the miscible zone in the reservoir of the sandstone reservoir, provided by this embodiment, is configured to calculate the void volume according to the diameter, the length, the porosity and the permeability of the core of the target reservoir, perform a long core displacement experiment according to the void volume to determine the gas injection amount and the displacement pressure, and finally input the permeability, the gas injection amount and the displacement pressure into the miscible zone volume empirical model to determine the volume of the miscible zone. By the aid of the miscible zone volume empirical model, the miscible zone volume in the reservoir can be accurately determined by combining the difference between the miscible zone volume and an actual reservoir when the miscible zone volume is determined.
The present invention also provides an electronic device, comprising: a memory and a processor;
a memory for storing executable instructions of the processor;
the processor is configured to perform the method for determining the volume of the miscible zone in a reservoir of a sandstone reservoir as referred to in figures 1-3, via execution of executable instructions.
The readable storage medium may be a computer storage medium or a communication medium. Communication media includes any medium that facilitates transfer of a computer program from one place to another. Computer storage media may be any media that can be accessed by a general purpose or special purpose computer. For example, a readable storage medium is coupled to the processor such that the processor can read information from, and write information to, the readable storage medium. Of course, the readable storage medium may also be an integral part of the processor. The processor and the readable storage medium may reside in an Application Specific Integrated Circuits (ASIC). Additionally, the ASIC may reside in user equipment. Of course, the processor and the readable storage medium may also reside as discrete components in a communication device.
The present invention also provides a storage medium having stored thereon a computer program which, when executed by a processor, implements the method of determining the volume of a miscible zone in a reservoir of a sandstone reservoir of figures 1-3.
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 (14)
1. A method for determining the volume of a miscible zone in a reservoir of a sandstone reservoir is characterized by comprising the following steps:
acquiring the diameter, the length, the porosity and the permeability of a target reservoir core;
calculating the pore volume of the target reservoir core according to the diameter, the length and the porosity of the target reservoir core;
performing a long core displacement experiment on the target reservoir core according to the pore volume of the target reservoir core, and determining the gas injection quantity and the displacement pressure of the target reservoir core;
inputting the gas injection quantity, the displacement pressure and the permeability of the target reservoir core into the multiphase belt volume empirical model so that the multiphase belt volume empirical model outputs the multiphase belt volume in the sandstone reservoir.
2. The method as claimed in claim 1, further comprising, prior to the obtaining the diameter, length, porosity and permeability of the target reservoir core:
acquiring the diameters, the lengths, the porosities and the permeabilities of a plurality of training reservoir cores;
respectively calculating the pore volumes corresponding to the training reservoir cores according to the diameters, the lengths and the porosities of the plurality of training reservoir cores, and taking the pore volumes corresponding to the training reservoir cores as the injection volumes of the long core displacement experiment;
and respectively carrying out a plurality of long core displacement experiments by using a plurality of injection volumes to determine a miscible phase zone volume empirical model, wherein the plurality of injection volumes are different pairwise.
3. The method of claim 2, wherein determining the miscible zone volume empirical model by performing a plurality of long core displacement experiments using a plurality of injection volumes, respectively, comprises:
respectively carrying out a plurality of long core displacement experiments by using a plurality of injection volumes to obtain the oil outlet volume and the water outlet volume in the plurality of long core displacement experiments;
respectively determining the oil displacement efficiency in the multiple long core displacement experiments according to the oil outlet volume and the water outlet volume in the multiple long core displacement experiments;
determining a relation curve of gas injection quantity, displacement pressure and permeability and miscible volume ratio according to oil displacement efficiency in a plurality of long core displacement experiments;
carrying out nonlinear fitting on the relationship curves of the gas injection quantity, the displacement pressure and the permeability and the proportion of the miscible volume respectively to determine the reference coefficient of the miscible zone volume empirical model;
and determining a volume empirical model of the miscible band corresponding to the reference coefficient.
4. The method according to claim 3, wherein the determining the oil displacement efficiency in the long core displacement experiments respectively according to the oil outlet volume and the water outlet volume in the long core displacement experiments comprises:
using the formula n as 100% × Vo1/(Vo-Vo1) Respectively calculating the oil displacement efficiency of the plurality of training reservoir rock cores;
wherein n is the oil displacement efficiency of the reservoir core, Vo1Volume of oil produced, VoIs the volume of the effluent.
5. The method as recited in claim 1, wherein calculating the pore volume of the reservoir core as a function of the diameter, length, and porosity of the reservoir core comprises:
using a formula
Calculating the pore volume of the reservoir core;
wherein V is the void volume of the reservoir core, D is the diameter of the reservoir core, L is the length of the reservoir core,
is the porosity of the reservoir core.
6. The method according to any one of claims 1 to 5, wherein the empirical model of the bulk phase mixture is Vm ═ V × [ a × P + b × Gi + c × 10-5(linK)d-e]；
Wherein, VmThe volume of a miscible phase zone in a sandstone reservoir stratum, V is the void volume of a reservoir core, GiIs the gas injection amount, P is the displacement pressure, K is the permeability, and a, b, c, d and e are the miscible band volume reference coefficients.
7. An apparatus for determining the volume of a miscible zone in a reservoir of a sandstone reservoir, comprising:
the first acquisition module is used for acquiring the diameter, the length, the porosity and the permeability of a target reservoir core;
the first calculation module is used for calculating the pore volume of the target reservoir core according to the diameter, the length and the porosity of the target reservoir core;
the first determination module is used for performing a long core displacement experiment on the target reservoir core according to the pore volume of the target reservoir core, and determining the gas injection quantity and the displacement pressure of the target reservoir core;
and the model operation module is used for inputting the gas injection quantity, the displacement pressure and the permeability of the target reservoir core into the multiphase zone volume empirical model so as to enable the multiphase zone volume empirical model to output the multiphase zone volume in the sandstone reservoir.
8. The apparatus of claim 7, further comprising:
the second acquisition module is used for acquiring the diameters, the lengths, the porosities and the permeabilities of the multiple training reservoir cores;
the second calculation module is used for respectively calculating the pore volumes corresponding to the training reservoir cores according to the diameters, the lengths and the porosities of the plurality of training reservoir cores and taking the pore volumes corresponding to the training reservoir cores as the injection volumes of the long core displacement experiment;
and the model determining module is used for performing multiple long core displacement experiments by using multiple injection volumes respectively to determine a miscible phase zone volume empirical model, wherein the multiple injection volumes are different pairwise.
9. The apparatus of claim 8, wherein the model determination module comprises:
the volume acquisition unit is used for respectively carrying out a plurality of long core displacement experiments by using a plurality of injection volumes, and acquiring the oil outlet volume and the water outlet volume in the plurality of long core displacement experiments;
the oil displacement efficiency determining unit is used for respectively determining the oil displacement efficiency in the long core displacement experiments for a plurality of times according to the oil outlet volume and the water outlet volume in the long core displacement experiments for a plurality of times;
the relation curve determining unit is used for determining a relation curve of gas injection quantity, displacement pressure and permeability and the proportion of miscible phase volume according to oil displacement efficiency in a plurality of long core displacement experiments;
the fitting unit is used for carrying out nonlinear fitting on the relation curves of the gas injection quantity, the displacement pressure and the permeability and the proportion of the miscible volume respectively to determine the reference coefficient of the miscible zone volume empirical model;
and the model generation unit is used for determining a mixed phase zone volume empirical model corresponding to the reference coefficient.
10. According to claimThe apparatus of claim 9, wherein the oil displacement efficiency determination unit is specifically configured to use a formula n of 100% × Vo1/(Vo-Vo1) Respectively calculating the oil displacement efficiency of the plurality of training reservoir rock cores;
wherein n is the oil displacement efficiency of the reservoir core, Vo1Volume of oil produced, VoIs the volume of the effluent.
11. The apparatus according to claim 7, wherein the first calculation module is specifically configured to employ a formula
Calculating the pore volume of the reservoir core;
wherein V is the void volume of the reservoir core, D is the diameter of the reservoir core, L is the length of the reservoir core, and phi is the porosity of the reservoir core.
12. The apparatus according to any one of claims 7-11, wherein the empirical model of the bulk of the mixed-phase band is Vm ═ V × [ a × P + b × Gi + c × 10-5(linK)d-e]；
Wherein, VmThe volume of a miscible phase zone in a sandstone reservoir stratum, V is the void volume of a reservoir core, GiIs the gas injection amount, P is the displacement pressure, K is the permeability, and a, b, c, d and e are the miscible band volume reference coefficients.
13. An electronic device, comprising: a memory and a processor;
the memory for storing executable instructions of the processor;
the processor is configured to perform the method of any of claims 1-6 via execution of the executable instructions.
14. A storage medium having a computer program stored thereon, comprising: the program, when executed by a processor, implements the method of any of claims 1-6.
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