CN114320248A - Oil reservoir elastic energy simulation device, construction method and throughput simulation system - Google Patents
Oil reservoir elastic energy simulation device, construction method and throughput simulation system Download PDFInfo
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Abstract
The embodiment of the invention provides an oil reservoir elastic energy simulation device, a construction method and a throughput simulation system, wherein the device comprises: a buffer oil body loading container, a buffer gas loading container and a valve; the other end of the buffer oil body loading container is connected with the bottom end of a three-dimensional oil reservoir model in the original huff and puff simulation device through the valve; the buffer oil body loading container is used for loading a first volume of buffer oil body; the buffer gas loading container is used for loading a second volume of buffer gas; the first volume and the second volume are obtained by calculation according to physical parameters of a target oil reservoir and a corresponding three-dimensional oil reservoir model. Through setting up the buffer oil body that buffer oil body loading container loaded first volume, buffer gas loading container loads the buffer gas of second volume to can reduce the difference of throughput simulation and the actual gas injection throughput condition, and then improve the effect according to the actual gas injection throughput exploitation scheme of throughput physical simulation generation.
Description
Technical Field
The embodiment of the invention relates to the technical field of oil reservoir development, in particular to an oil reservoir elastic energy simulation device, a construction method and a throughput simulation system.
Background
In the field of oil reservoir development, gas injection huff and puff mining is a common oil reservoir development mode. The gas capable of injecting gas mainly comprises carbon dioxide, nitrogen, air, oxygen-reduced air and the like, and the gas injection development can effectively supplement the oil reservoir energy, enhance the displacement effect and control water and stabilize oil. Gas injection stimulation is production by multiple rounds of periodic injection and production. In the injection process, the oil reservoir energy is increased, the pressure is increased, and the sweep coefficient can be improved by gas injection; meanwhile, the oil displacement efficiency can be improved by reducing the interfacial tension after the gas is injected. After a period of well closing, the well is opened to produce, and the oil reservoir is produced by means of the elastic energy of pores and fluid. In the gas injection huff and puff exploitation period, various parameters of the oil reservoir are changed in a complex way, so that the research on the pressure change of the oil reservoir and the injection production rule in the huff and puff process is the main research field of the oil reservoir development at present.
The physical simulation is a common means for researching the development dynamics of the oil reservoir, and the physical simulation experiment can artificially reproduce the development process of gas injection huff and puff development, is convenient for observing the pressure change in the huff and puff process and researching the injection production rule of the huff and puff development, and provides a basis for formulating the gas injection huff and puff development scheme of the actual oil reservoir.
The current huff and puff physical simulation does not relate to the simulation of the elastic energy of the oil reservoir, so that the huff and puff physical simulation is greatly different from the actual gas injection huff and puff condition, and the actual gas injection huff and puff mining scheme generated according to the huff and puff physical simulation has poor effect.
Disclosure of Invention
The invention provides an oil reservoir elastic energy simulation device, a construction method and a huff and puff simulation system, which are used for solving the problem that the huff and puff physical simulation is greatly different from the actual gas injection huff and puff situation due to the fact that the current huff and puff physical simulation does not relate to the simulation of oil reservoir elastic energy, and further the actual gas injection huff and puff mining scheme generated according to the huff and puff physical simulation is poor in effect.
In a first aspect, the present invention provides a reservoir elastic energy simulation apparatus, including:
a buffer oil body loading container, a buffer gas loading container and a valve;
one end of the buffer oil body loading container is connected with one end of the buffer gas loading container; the other end of the buffer oil body loading container is connected with the bottom end of a three-dimensional oil reservoir model in the original huff and puff simulation device through the valve;
the buffer oil body loading container is used for loading a first volume of buffer oil body; the buffer gas loading container is used for loading a second volume of buffer gas; the first volume and the second volume are obtained by calculation according to physical parameters of a target oil reservoir and a corresponding three-dimensional oil reservoir model;
the valve is used for being opened when the original huff and puff simulation device simulates huff and puff, and the buffer oil body loading container is communicated with the bottom end of the three-dimensional oil reservoir model, so that the buffer gas pushes the buffer oil body to move towards the three-dimensional oil reservoir model according to the gas elastic energy; and the buffer oil body extrudes the oil body in the bottom end of the three-dimensional oil reservoir model into the huff-puff well in the three-dimensional oil reservoir model according to the elastic energy of the oil body and the elastic energy of the gas.
Further, the apparatus as described above, further comprising: a fluid communication unit;
one end of the buffer oil body loading container is connected with one end of the buffer gas loading container through the fluid communication unit.
Further, the apparatus as described above, further comprising: a displacement pump;
the displacement pump is connected with one end of the buffer oil body loading container through the fluid communication unit;
and the displacement pump is used for conveying the buffer oil body into the buffer oil body loading container and adjusting the pressure in the buffer oil body loading container to the formation pressure of the target oil reservoir in the huff and puff simulation preparation stage.
Further, the apparatus as described above, further comprising: inflating a high-pressure gas cylinder;
the inflatable high-pressure gas cylinder is connected with one end of the buffer gas loading container through the fluid communication unit;
the gas-filled high-pressure gas cylinder is used for conveying the buffer gas into the buffer gas loading container and regulating the pressure in the buffer gas loading container to the formation pressure of a target oil reservoir in a huff and puff simulation preparation stage.
In a second aspect, the invention provides a method for constructing an oil reservoir elastic energy simulation device, which comprises the following steps: a buffer oil body loading vessel, a buffer gas loading vessel, and a valve, the method comprising:
acquiring physical parameters of a target oil reservoir and a corresponding three-dimensional oil reservoir model;
calculating according to the physical parameters to obtain a first volume corresponding to the buffer oil volume and a second volume corresponding to the buffer gas;
setting a buffer oil body loading container according to the first volume, and setting a buffer gas loading container according to the second volume;
and connecting one end of the buffer oil body loading container with one end of the buffer gas loading container, and connecting the other end of the buffer oil body loading container with the bottom end of a three-dimensional oil reservoir model in the primitive huff and puff simulation device through a valve.
Further, the method as described above, wherein the obtaining a first volume corresponding to the buffer oil volume and a second volume corresponding to the buffer gas by calculation according to the physical parameter includes:
calculating to obtain a physical parameter similarity ratio according to the first physical parameter of the target oil reservoir and the first physical parameter of the three-dimensional oil reservoir model;
calculating according to the physical parameter similarity ratio to obtain a compression coefficient ratio;
and calculating to obtain the first volume and the second volume according to the compression coefficient ratio, the second physical parameter of the target oil reservoir, the first physical parameter of the three-dimensional oil reservoir model and the third physical parameter.
Further, the method as described above, the first physical parameter comprises density, porosity, and reservoir length;
the step of obtaining the physical parameter similarity ratio by calculation according to the first physical parameter of the target oil reservoir and the first physical parameter of the three-dimensional oil reservoir model comprises the following steps:
calculating to obtain a density similarity ratio according to the density of the target oil reservoir and the density of the three-dimensional oil reservoir model;
calculating according to the porosity of the target oil reservoir and the porosity of the three-dimensional oil reservoir model to obtain a porosity similarity ratio;
and calculating to obtain the oil reservoir length similarity ratio according to the oil reservoir length of the target oil reservoir and the oil reservoir length of the three-dimensional oil reservoir model.
Further, the method as described above, the second physical parameter includes: formation crude oil compressibility; the third physical parameter includes: volume of the three-dimensional reservoir model;
the calculating according to the compression coefficient ratio, the second physical parameter of the target oil reservoir and the third physical parameter of the three-dimensional oil reservoir model to obtain the first volume and the second volume comprises the following steps:
and calculating to obtain a first volume and a second volume according to the compression coefficient ratio, the formation crude oil compression coefficient, the volume of the three-dimensional oil reservoir model and the porosity of the three-dimensional oil reservoir model through a preset volume calculation formula.
Further, in the method as described above, the preset volume calculation formula is:
Vg＝p[(CD-1)CopVrφm-CopVo1]；
Vg+Vo1＝V；
wherein, VgIs a second volume, Vo1Is a first volume, V is preset volume data, VrIs the volume of a three-dimensional reservoir model, phimPorosity, C, for three-dimensional reservoir modelsDIs a compression coefficient ratio, CopIs the formation crude oil compressibility and p is the formation pressure.
In a third aspect, the present invention provides a throughput simulation system, comprising: a pristine huff and puff simulator and the oil reservoir elastic energy simulator of any one of the first aspect;
the primitive huff and puff simulation device is connected with the oil reservoir elastic energy simulation device through the bottom end of the three-dimensional oil reservoir model.
The oil deposit elastic energy simulation device, the construction method and the handling simulation system provided by the embodiment of the invention comprise the following steps: a buffer oil body loading container, a buffer gas loading container and a valve; one end of the buffer oil body loading container is connected with one end of the buffer gas loading container; the other end of the buffer oil body loading container is connected with the bottom end of a three-dimensional oil reservoir model in the original huff and puff simulation device through the valve; the buffer oil body loading container is used for loading a first volume of buffer oil body; the buffer gas loading container is used for loading a second volume of buffer gas; the first volume and the second volume are obtained by calculation according to physical parameters of a target oil reservoir and a corresponding three-dimensional oil reservoir model; the valve is used for being opened when the original huff and puff simulation device simulates huff and puff, and the buffer oil body loading container is communicated with the bottom end of the three-dimensional oil reservoir model, so that the buffer gas pushes the buffer oil body to move towards the three-dimensional oil reservoir model according to the gas elastic energy; and the buffer oil body extrudes the oil body in the bottom end of the three-dimensional oil reservoir model into the huff-puff well in the three-dimensional oil reservoir model according to the elastic energy of the oil body and the elastic energy of the gas. The buffer oil body loading container is arranged to load the buffer oil body with the first volume, and the buffer gas loading container is used for loading the buffer gas with the second volume, so that when the original huff and puff simulation device simulates huff and puff, the valve can be opened, the buffer gas can extrude the oil body in the bottom end of the three-dimensional oil reservoir model into a huff and puff well in the three-dimensional oil reservoir model by combining the elastic energy of the buffer oil body, the difference between the huff and puff simulation and the actual gas injection huff and puff situation can be reduced, and the effect of the actual gas injection huff and puff mining scheme generated according to the huff and puff physical simulation is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural diagram of an oil reservoir elastic energy simulation device according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a reservoir elastic energy simulation device according to another embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for constructing an elastic property simulation device of an oil reservoir according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a method for constructing an elastic property simulation device of an oil reservoir according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a throughput simulation system according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a throughput simulation system according to another embodiment of the present invention.
Description of the symbols:
1. a buffer oil body loading container; 2. a buffer gas loading vessel; 3. a valve; 4. a three-dimensional reservoir model; 5. a fluid communication unit; 6. a displacement pump; 7. inflating a high-pressure gas cylinder; 310. a raw throughput simulation device; 320. an oil reservoir elastic energy simulation device; 311. injecting a gas high-pressure cylinder; 312. a pressure gauge; 313. an inlet valve; 315. a back pressure valve; 316. an outlet valve; 317. an oil-gas separation device; 318. a gas meter; 319 data acquisition means.
In the attached drawings of the embodiment of the invention, fig. 1 and fig. 2 are used for clearly showing the external connection relationship of the oil reservoir elastic energy simulation device according to the embodiment of the invention, the connection relationship between the oil reservoir elastic energy simulation device according to the embodiment and the three-dimensional oil reservoir model 4 is added in the attached drawings, but the oil reservoir elastic energy simulation device according to the embodiment of the invention does not include the three-dimensional oil reservoir model 4, and therefore, the description is given.
With the above figures, certain embodiments of the invention have been illustrated and described in more detail below. The drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate it by those skilled in the art with reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
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. Embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an oil reservoir elastic energy simulation device according to an embodiment of the present invention, as shown in fig. 1, in this embodiment, the oil reservoir elastic energy simulation device includes: a buffer oil body loading container 1, a buffer gas loading container 2 and a valve 3.
One end of the buffer oil body loading container 1 is connected with one end of the buffer gas loading container 2. The other end of the buffer oil body loading container 1 is connected with the bottom end of a three-dimensional oil reservoir model 4 in the primitive huff and puff simulation device through a valve 3.
The buffer oil body loading container 1 is used for loading a first volume of buffer oil bodies. The buffer gas loading container 2 is used for loading a second volume of buffer gas. The first volume and the second volume are calculated from physical parameters of the target reservoir and the corresponding three-dimensional reservoir model 4.
And the valve 3 is used for being opened when the primitive huff and puff simulation device simulates huff and puff, and the buffer oil body loading container 1 is communicated with the bottom end of the three-dimensional oil reservoir model 4, so that the buffer gas can push the buffer oil body to move towards the three-dimensional oil reservoir model 4 according to the gas elastic energy. The buffer oil body extrudes the oil body in the bottom end of the three-dimensional oil reservoir model 4 into the huff-puff well in the three-dimensional oil reservoir model 4 according to the elastic energy of the oil body and the elastic energy of the gas.
In this embodiment, the buffer oil body loading container 1 and the buffer gas body loading container 2 may be rectangular parallelepiped containers, cylindrical containers, or tank-shaped containers, which is not particularly limited in this embodiment.
In this embodiment, the three-dimensional oil reservoir model 4 is used as an externally connected device and is mainly used for simulating the basic structure of a target oil reservoir, and the three-dimensional oil reservoir model 4 includes a huff-puff well, an external support, a porous medium structure, a sand structure and an oil body, wherein the porous medium structure covers the inner surface of the external support, the sand structure covers above the porous medium structure, and the oil body is arranged above the sand structure. The huff-and-puff well is arranged above the oil body and penetrates through the upper layer part of the outer support to form a connecting channel with an external device. Each structure in the three-dimensional oil reservoir model 4 is set according to the proportional relation of the target oil reservoir so as to improve the simulation precision of the target oil reservoir.
In this embodiment, the first volume and the second volume are obtained by calculating physical parameters of the target oil reservoir and the corresponding three-dimensional oil reservoir model, where the physical parameters may include density, porosity, oil reservoir length, formation crude oil compression coefficient, three-dimensional oil reservoir model volume, and the first volume and the second volume are obtained by calculating according to a preset volume calculation formula.
In the present embodiment, the huff and puff simulation is performed through a gas injection stage, a blank well stage, a simulated mining stage, and a measurement stage, respectively. When the pristine huff and puff simulation device enters a gas injection stage, a valve 3 in the oil reservoir elastic energy simulation device is opened so as to enable the buffering oil body loading container 1 to be communicated with the bottom end of the three-dimensional oil reservoir model 4. At this time, the injected gas brings pressure into the three-dimensional reservoir model 4, and transmits the pressure to the buffer oil body loading vessel 1 and the buffer gas loading vessel 2 through the passage between the buffer oil body loading vessel 1 and the three-dimensional reservoir model 4. After the well-closing phase, the pressure in the buffer oil body charge vessel 1 and the buffer gas charge vessel 2 tends to level off. In the simulated mining phase, the pressure conditions between the three-dimensional simulation apparatus, the buffer oil body charge container 1 and the buffer gas charge container 2 start to be out of balance due to the opening of the outlet valve above the three-dimensional simulation apparatus. At this time, the gas in the buffer gas loading container 2 and the elastic energy of the oil body in the buffer oil body loading container 1 are transmitted from the buffer gas loading container 2, the buffer oil body loading container 1 and the three-dimensional reservoir model 4 by pressure, so that the oil body in the three-dimensional reservoir model 4 is squeezed into the huff and puff well, and the oil body is output to the oil-gas separation device of the primary huff and puff simulator through the huff and puff well. And further, the subsequent measurement stage can be carried out, the throughput simulation is completed, and the corresponding mining scheme is generated according to the throughput simulation.
The elastic energy simulation device of oil reservoir of this embodiment, this elastic energy simulation device of oil reservoir includes: this oil deposit elastic energy analogue means includes: a buffer oil body loading container 1, a buffer gas loading container 2 and a valve 3. One end of the buffer oil body loading container 1 is connected with one end of the buffer gas loading container 2, and the other end of the buffer oil body loading container 1 is connected with the bottom end of a three-dimensional oil reservoir model 4 in the primitive huff and puff simulation device through a valve 3. The buffer oil body loading container 1 is used for loading a first volume of buffer oil body, and the buffer gas loading container 2 is used for loading a second volume of buffer gas. The first volume and the second volume are calculated from physical parameters of the target reservoir and the corresponding three-dimensional reservoir model 4. Meanwhile, the valve 3 is used for being opened when the primitive huff and puff simulation device simulates huff and puff, and the buffer oil body loading container 1 is communicated with the bottom end of the three-dimensional oil reservoir model 4, so that the buffer gas pushes the buffer oil body to move towards the three-dimensional oil reservoir model 4 according to the gas elastic energy. The buffer oil body extrudes the oil body in the bottom end of the three-dimensional oil reservoir model 4 into the huff-puff well in the three-dimensional oil reservoir model 4 according to the elastic energy of the oil body and the elastic energy of the gas. Through setting up the buffer oil body that buffer oil body loading container 1 loaded the first volume, buffer gas loading container 2 loads the buffer gas of second volume to when primitive simulation device of handling in business is taken in business, can be through opening valve 3, make buffer gas combine the elasticity ability of buffer oil body to crowd the well of handling in three-dimensional oil reservoir model 4 with the oil body in three-dimensional oil reservoir model 4 bottom, thereby can reduce the difference of the simulation of handling in business and the actual gas injection condition of handling in business, and then improve the effect according to the actual gas injection exploitation scheme of handling in business that physical simulation of handling in business generated.
Fig. 2 is a schematic structural diagram of an elastic reservoir energy simulation apparatus according to another embodiment of the present invention, and as shown in fig. 2, a plurality of devices are added to the elastic reservoir energy simulation apparatus according to this embodiment on the basis of the elastic reservoir energy simulation apparatus according to the previous embodiment, and then the elastic reservoir energy simulation apparatus according to this embodiment further includes:
optionally, in this embodiment, the oil reservoir elastic energy simulation apparatus further includes: a fluid communication unit 5.
One end of the buffer oil body-loading container 1 is connected to one end of the buffer gas-loading container 2 through a fluid communication unit 5.
In this embodiment, the fluid communication unit 5 may be a six-way valve. Each channel in the fluid communication unit 5 can be correspondingly opened and closed according to the switch of the channel, so that the corresponding channel can be opened when needed, and the corresponding channel can be closed when not needed, thereby improving the flexibility of the whole throughput simulation.
Optionally, in this embodiment, the method further includes: the pump 6 is displaced.
Wherein the displacement pump 6 is connected to one end of the buffer oil body-loading container 1 through the fluid communication unit 5.
The displacement pump 6 is used for conveying the buffer oil body into the buffer oil body loading container 1 and adjusting the pressure in the buffer oil body loading container 1 to the formation pressure of the target oil reservoir in the huff and puff simulation preparation stage.
In this embodiment, the formation pressure of the target reservoir may be obtained by measuring with a measuring tool, or may be obtained by obtaining stored corresponding data from a preset database, which is not limited in this embodiment.
In this embodiment, the displacement pump 6 is connected to one end of the buffer oil body loading container 1 through the fluid communication unit 5, and the fluid communication unit 5 can control the opening and closing of the passage between the displacement pump 6 and the buffer oil body loading container 1 through an internal switch.
Optionally, in this embodiment, the method further includes: and a high-pressure gas cylinder 7 is filled.
Wherein, the gas filled high pressure gas cylinder 7 is connected to one end of the buffer gas loading container 2 through the fluid communication unit 5.
The gas-filled high-pressure gas cylinder 7 is used to deliver buffer gas into the buffer gas loading container 2 and adjust the pressure in the buffer gas loading container 2 to the formation pressure of the target reservoir in the huff and puff simulation preparation phase.
In this embodiment, the formation pressure of the target reservoir may be obtained by measuring with a measuring tool, or may be obtained by obtaining stored corresponding data from a preset database, which is not limited in this embodiment.
In this embodiment, the gas-filled high-pressure cylinder 7 is connected to one end of the buffer gas loading container 2 through the fluid communication unit 5, and the fluid communication unit 5 can control the opening and closing of the passage between the gas-filled high-pressure cylinder 7 and the buffer gas loading container 2 through an internal switch.
The reservoir elastic energy simulation device of the embodiment is provided with various devices related to prepositive preparation, so that the volumes of the buffer oil body in the buffer oil body loading container 1 and the buffer gas in the buffer gas loading container 2 can be more efficiently set in the handling simulation preparation stage, the pressure of the two containers is ensured to be the same, the pressure is also the same as the formation pressure of a target reservoir, and the actual exploitation condition of the target reservoir can be more accurately simulated.
Fig. 3 is a schematic flow chart of a method for constructing an elastic reservoir performance simulation apparatus according to an embodiment of the present invention, and as shown in fig. 3, the method for constructing an elastic reservoir performance simulation apparatus according to this embodiment is based on the elastic reservoir performance simulation apparatus provided in any of the above embodiments, and the elastic reservoir performance simulation apparatus includes: buffer oil body loading container 1, buffer gas loading container 2 and valve 3, the method includes:
and S101, acquiring physical parameters of a target oil reservoir and a corresponding three-dimensional oil reservoir model.
In this embodiment, the physical parameters may include density, porosity, reservoir length, formation crude oil compressibility, three-dimensional reservoir model volume, and the like.
And S102, calculating according to the physical parameters to obtain a first volume corresponding to the buffer oil volume and a second volume corresponding to the buffer gas.
In this embodiment, the first volume corresponding to the buffer oil volume and the second volume corresponding to the buffer gas may be calculated by a preset volume formula according to the physical parameter.
In step S103, a buffer oil body loading container is set according to the first volume, and a buffer gas loading container is set according to the second volume.
In this embodiment, the setting of the buffer oil body loading container according to the first volume is to set the buffer oil body of the corresponding volume in the buffer oil body loading container according to the first volume data. Further, the pressure in the buffer oil body loading container may also be set to the formation pressure of the target reservoir. Similarly, the setting of the buffer gas loading container according to the second volume is setting a corresponding volume of buffer gas in the buffer gas loading container according to the second volume data. The buffer gas may be carbon dioxide, nitrogen, hypoxic air, etc., preferably an inert gas. Further, the pressure in the buffer gas loading vessel may also be set to the formation pressure of the target reservoir.
And step S104, connecting one end of the buffer oil body loading container with one end of a buffer gas loading container, and connecting the other end of the buffer oil body loading container with the bottom end of a three-dimensional oil reservoir model in the primitive huff and puff simulation device through a valve.
According to the method for constructing the oil reservoir elastic energy simulation device, the physical parameters of the target oil reservoir and the corresponding three-dimensional oil reservoir model are obtained, the first volume corresponding to the buffer oil body and the second volume corresponding to the buffer gas are obtained through calculation according to the physical parameters, and the corresponding buffer oil body loading container and the buffer gas loading container are arranged through the first volume and the second volume. Because the first volume and the second volume are closely related to the physical parameters of the target oil reservoir and the corresponding three-dimensional oil reservoir model, the actual elastic performance of the target oil reservoir can be better simulated through the first volume and the second volume, so that an oil reservoir elastic performance simulation device with higher simulation precision can be constructed, and the effect of the actual gas injection huff-and-puff mining scheme generated according to huff-and-puff physical simulation is further improved.
Fig. 4 is a schematic flow diagram of a method for constructing an elastic reservoir energy simulation device according to another embodiment of the present invention, and as shown in fig. 4, the method for constructing an elastic reservoir energy simulation device according to this embodiment further refines step 102 on the basis of the method for constructing an elastic reservoir energy simulation device according to the previous embodiment, and then the method for constructing an elastic reservoir energy simulation device according to this embodiment further includes the following technical solutions.
Step S201, physical parameters of a target oil reservoir and a corresponding three-dimensional oil reservoir model are obtained.
In this embodiment, the implementation manner of step 201 is similar to that of step 101 in the previous embodiment of the present invention, and is not described in detail here.
It should be noted that, the steps 202-204 are further detailed in the step 102.
Step S202, calculating according to the first physical parameter of the target oil reservoir and the first physical parameter of the three-dimensional oil reservoir model to obtain a physical parameter similarity ratio.
In this embodiment, the first physical parameter corresponds to a first physical parameter of the three-dimensional reservoir model, and the first physical parameter may include physical parameters required for simulating an internal structure, such as density, porosity, reservoir length, and the like.
Optionally, in this embodiment, the first physical parameter includes density, porosity, and reservoir length.
Meanwhile, the step of calculating the similarity ratio of the physical parameters according to the first physical parameters of the target oil reservoir and the first physical parameters of the three-dimensional oil reservoir model comprises the following steps:
and calculating to obtain the density similarity ratio according to the density of the target oil reservoir and the density of the three-dimensional oil reservoir model.
And meanwhile, calculating according to the porosity of the target oil reservoir and the porosity of the three-dimensional oil reservoir model to obtain a porosity similarity ratio.
And calculating to obtain the oil reservoir length similarity ratio according to the oil reservoir length of the target oil reservoir and the oil reservoir length of the three-dimensional oil reservoir model.
In this embodiment, the density, the porosity, and the reservoir length are important physical parameters of the three-dimensional reservoir model for simulating the internal structure of the target reservoir, and the degree of correspondence and the degree of scaling between the three-dimensional reservoir model and the target reservoir can be obtained by determining the similarity ratio between the two models.
And step S203, calculating according to the physical parameter similarity ratio to obtain a compression coefficient ratio.
In this embodiment, the compression coefficient ratio may be obtained by multiplying the density similarity ratio, the porosity similarity ratio, and the reservoir length similarity ratio.
And step S204, calculating to obtain a first volume and a second volume according to the compression coefficient ratio, the second physical parameter of the target oil reservoir, the first physical parameter of the three-dimensional oil reservoir model and the third physical parameter.
In this embodiment, the second physical parameter of the target reservoir may be a relevant parameter of oil bodies in the target reservoir. The third physical parameter of the three-dimensional reservoir model may be size-related data of the three-dimensional reservoir model. Meanwhile, the first volume and the second volume can be obtained through calculation of a calculation formula according to the compression coefficient ratio, the second physical parameter of the target oil reservoir, the first physical parameter and the third physical parameter of the three-dimensional oil reservoir model.
Optionally, in this embodiment, the second physical parameter includes: formation crude oil compressibility. The third physical parameter includes: volume of the three-dimensional reservoir model.
Calculating to obtain a first volume and a second volume according to the compression coefficient ratio, the second physical parameter of the target oil reservoir and the third physical parameter of the three-dimensional oil reservoir model, and the method comprises the following steps:
and calculating to obtain a first volume and a second volume according to the compression coefficient ratio, the formation crude oil compression coefficient, the volume of the three-dimensional oil reservoir model and the porosity of the three-dimensional oil reservoir model by a preset volume calculation formula.
Optionally, in this embodiment, the preset volume calculation formula is:
Vg＝p[(CD-1)CopVrφm-CopVo1]
Vg+Vo1＝V
wherein, VgIs a second volume, Vo1Is a first volume, V is preset volume data, VrIs the volume of a three-dimensional reservoir model, phimPorosity, C, for three-dimensional reservoir modelsDIs a compression coefficient ratio, CopIs the formation crude oil compressibility and p is the formation pressure.
In this embodiment, the preset volume data may be the sum of the volume data of the buffer oil body loading container and the buffer gas loading container, or may be volume data set according to actual requirements.
In step S205, a buffer oil body loading container is set according to the first volume, and a buffer gas loading container is set according to the second volume.
In this embodiment, the implementation manner of step 205 is similar to that of step 103 in the previous embodiment of the present invention, and is not described in detail here.
And S206, connecting one end of the buffer oil body loading container with one end of the buffer gas loading container, and connecting the other end of the buffer oil body loading container with the bottom end of the three-dimensional oil reservoir model in the primitive huff and puff simulation device through a valve.
In this embodiment, the implementation manner of step 206 is similar to that of step 104 in the previous embodiment of the present invention, and is not described in detail here.
According to the method for constructing the oil reservoir elastic energy simulation device, the physical parameters of the target oil reservoir and the corresponding three-dimensional oil reservoir model are obtained, and the physical parameters comprise a first physical parameter and a second physical parameter of the target oil reservoir, and a first physical parameter and a third physical parameter of the three-dimensional oil reservoir model. And calculating a first volume corresponding to the buffer oil volume and a second volume corresponding to the buffer gas according to various physical parameters and through a calculation formula, so as to set a corresponding buffer oil volume loading container and a corresponding buffer gas loading container according to the first volume and the second volume. Because the first volume part and the second volume part are related to the target oil reservoir and the physical parameters of the corresponding three-dimensional oil reservoir model, the actual elastic performance of the target oil reservoir can be better simulated through the first volume part and the second volume part, so that an oil reservoir elastic performance simulation device with higher simulation precision can be constructed, and the effect of the actual gas injection huff-and-puff mining scheme generated according to huff-and-puff physical simulation is improved.
Meanwhile, in order to better understand the method for constructing the oil reservoir elastic energy simulation device provided in this embodiment, the derivation of the preset volume calculation formula will be described in detail below.
And selecting the criterion number with larger influence on the development of the gas injection throughput according to the derived similarity criterion number of the gas injection throughput stage. In the gas injection phase, the following similarity criterion numbers can be obtained according to the ratio of gravity to viscous force:
in the formula: phi: porosity, decimal fraction; k: absolute permeability, 10-3μm2；ρo: density of oil, kg/m3；Sor、Swc: residual oil and irreducible water saturations, decimal; Δ S: saturation normalization constant,. DELTA.S ═ 1- (S)or+Swc)；μo: viscosity of the oil phase, mPa · s; l: length of the reservoir, m; t: production time, s; g: acceleration of gravity, 9.8m/s2。
The permeability in the three-dimensional reservoir model can be modeled by the similarity criterion number of equation (1).
In the production phase of the throughput simulation, the following similarity criterion numbers can be obtained by dimensionless elastic energy and the ratio of gravity to viscous force in the phase:
dividing formula (2) by formula (3) gives:
in the formula: co: compression factor of oil, MPa-1(ii) a Δ ρ: difference in density between oil and water, kg/m3。
In order to make the three-dimensional reservoir model similar to the prototype of the target reservoir, the number of similarity criteria consisting of the univalent physical quantities must be equal to the number of similarity criteria of the corresponding prototype, namely:
πdie＝πOriginal source (5)
And (3) bringing design parameters of the three-dimensional oil reservoir model and parameters of the target oil reservoir into criterion numbers by an equation (4) to obtain:
in the formula: phi is am: porosity in the model, decimal; l ism: the interval between the huff and puff wells in the model, m; gm: gravitational acceleration in the model, 9.8m/s2，Δρm: difference in oil and water density in kg/m model3，Com: compression factor of oil in model, MPa-1。φp: porosity, decimal, of the target reservoir; l isp: the interval between the huff and puff wells of the target oil reservoir, m; gp: gravitational acceleration of target reservoir, 9.8m/s2，Δρp: difference of oil-water density in target oil reservoir, kg/m3，Cop: compression factor of oil of target reservoir, MPa-1。
Let the compression coefficient ratio be CDThe values are as follows:
by bringing formula (7) into formula (6), it is possible to obtain:
Com＝CDCop (8)
because the crude oil in the stratum is under the original stratum pressure for a long time, when gas is injected into the development well, the oil layer is compressed, the pressure of the oil layer rises, and the oil in the oil layer is compressed and shrunk; when the well is closed and enters the production stage, the pressure of the oil layer is reduced, and the original compressed oil in the oil layer expands, so that part of the original oil is driven to the bottom of the well. The compression coefficient of the oil represents the elastic energy of the oil, represents the relative change of the volume of the oil body when unit pressure drop is changed, and the calculation formula is as follows:
in the formula: co: isothermal compressibility of crude oil, MPa-1；Vo: volume of crude oil underground at pressure p, m3(ii) a p: formation pressure, MPa.
Meanwhile, the stratum pressure rises in the gas injection process, the stratum pressure drops in the oil extraction stage, and as the acting force of the overlying rock layer is a constant, the stress borne by the rock framework can be changed inevitably, so that deformation is caused, and the pore volume is increased or reduced as a result. The formation pore compressibility is defined as the reduction (increase) of pore volume per unit apparent volume of rock per unit pressure reduction (increase) of formation pressure, and is calculated by the formula:
in the formula: cf: compression factor of rock, MPa-1；Vb: apparent volume of rock, m3；Vp: pore volume of rock, m3。
Therefore, when the formation pressure decreases (increases), the pore volume decreases (increases) on the one hand, and the crude oil expands (contracts) on the other hand, and the two functions together to drain (store the injected gas). Assuming a volume of VrWhen the reservoir pressure drops by delta p, the formation rock volume ofAmount is VLAnd then:
VL＝ΔVp+ΔVo
＝CfVrΔp+CoVrφΔp
＝VrΔp(Cf+φCo) (11)
in the formula: vo: elastic oil production amount, m3；ΔVp: reduction of pore volume, m3；ΔVo: volume expansion of crude oil, m3；Vr: volume of porous Medium, m3(ii) a Δ p: formation pressure drop, MPa; phi: rock porosity, decimal fraction.
The simplification to equation (5) can be changed to:
VL＝VrΔp(Cf+φCo)＝VrΔpCt (12)
in the formula: co: compression factor of oil, MPa-1；Ct: complex elastic compressibility of the formation, Ct＝Cf+φCo，MPa-1。
The elastic energy of the oil reservoir plays an important role in gas injection huff-and-puff development, and the huff-and-puff simulation can be carried out only when the elastic energy in the three-dimensional oil reservoir model reaches a certain value. Therefore, the elastic energy is simulated by the external buffer oil body and the buffer gas, and the scheme is as follows:
when the buffer gas is not adopted for simulation, the compression coefficient is ComAccording to the elastic driving theory, the elastic oil production is equal to the sum of the reduction of the pore volume and the expansion of the crude oil volume, namely:
Vo1＝ΔVp+ΔVo＝CfVrΔp+ComVrφmΔp (13)
in the formula: vr: volume of porous medium containing oil layer, m3(ii) a Δ p: pressure change, MPa, Com: raw oil compression coefficient in the physical model, MPa-1，φm: porosity in physical model, decimal fraction.
When the external buffer gas is adopted for experimental simulation, the volume of the external buffer oil body is assumed to be V in actual operationo1The value is usually equal to the volume of crude oil in the three-dimensional reservoir model. The elastic oil production is equal to the sum of the reduction of the pore volume, the volume expansion of the crude oil, the volume expansion of the external buffer oil body and the volume expansion of the external gas, namely:
Vo2＝ΔVp+ΔVo+ΔVo1+ΔVg
＝CfVrΔp+CoVrφΔp+CoVo1Δp+CgVgΔp (14)
in the formula: Δ Vo: volume expansion of crude oil in model body, m3；ΔVo1: volume expansion of external buffer oil body, m3；ΔVg: volume expansion of external gas, m3；Co、Cf、Cg: respectively the compression coefficient of oil, the compression coefficient of rock and the compression coefficient of external gas, MPa-1。
In the three-dimensional huff and puff simulation experiment, formation crude oil is usually used, and the compression coefficient of the fluid in the model body is not greatly different from that of the crude oil in the formation, so that in the gas experiment simulation, the compression coefficient of the fluid is CopPorosity of phimThe following can be obtained:
Vo2＝CfVrΔp+CopVrφmΔp+CopVo1Δp+CgVgΔp (15)
based on the same elastic energy variation, the liquid production amounts in the production phases are the same, according to equations (13) and (15):
CfVrΔp+ComVrφmΔp＝CfVrΔp+CopVrφmΔp+CopVo1Δp+CgVgΔp (16)
neglecting the compressibility of the rock, i.e. CfWhen 0, we can get:
ComVrφmΔp＝CopVrφmΔp+CopVo1Δp+CgVgΔp (17)
bringing (8) into formula (17) gives:
(CD-1)CopVrφm＝CopVo1+CgVg (18)
the isothermal compressibility of a gas is defined as:
for an ideal gas, assuming a gas compression factor of 1, from the gas equation of state, it can be known that:
in the formula: n: amount of gaseous species, mol; r: gas constant, 8.314J/(mol. K); t: system temperature, K.
From equations (19) and (20), the following is derived:
by substituting formula (21) for formula (18), it is possible to obtain:
Vg＝p[(CD-1)CopVrφm-CopVo1] (22)
if the volume of buffer oil in the container is known, or 1 time the oil volume of the model body, i.e. Vo1＝φmVrIt is possible to obtain:
Vg＝p(CD-2)CopVrφm＝p(CD-2)CopVo1 (23)
known formation crude oil compressibility factor CopCompression factor ratio CDPores of porous medium in the model bodyDegree phimAnd p (formation pressure) change relation with time, and the preset volume formula can be obtained by using the above formula.
Fig. 5 is a schematic structural diagram of a throughput simulation system according to an embodiment of the present invention, and as shown in fig. 5, in this embodiment, the throughput simulation system includes: the raw throughput simulation apparatus 310 and the reservoir elastic energy simulation apparatus 320 according to any one of the first embodiment and the second embodiment.
The primitive throughput simulation device 310 is connected with the reservoir elastic energy simulation device 320 through the bottom end of the three-dimensional reservoir model 4.
In the throughput simulation system provided in this embodiment, the structure and function of the oil reservoir elastic energy simulation device are similar to those of the oil reservoir elastic energy simulation device provided in the first embodiment or the second embodiment of the present invention, and are not described in detail here.
Fig. 6 is a schematic structural diagram of a throughput simulation system according to another embodiment of the present invention, as shown in fig. 6. The raw throughput simulation device 310 may include a gas injection high-pressure gas cylinder 311, a pressure gauge 312, an inlet valve 313, a three-dimensional reservoir model 4, a back pressure valve 315, an outlet valve 316, an oil-gas separation device 317, a gas meter 318, and a data acquisition device 319.
An outlet of the gas injection high-pressure gas cylinder 311 is connected with an inlet valve 313, and a pressure gauge 312 is arranged between the outlet of the gas injection high-pressure gas cylinder 311 and the inlet valve 313. The huff-and-puff wells in the three-dimensional reservoir model 4 are respectively connected with the inlet valve 313 and the back pressure valve 315. The back-pressure valve 315 is connected to an inlet of an oil-gas separation device 317 through an outlet valve 316, and an outlet of the oil-gas separation device 317 is connected to a gas meter 318.
The data acquisition device 319 is respectively connected with the gas meter 318 and the three-dimensional reservoir model 4. The reservoir elastic energy simulation device 320 is connected with the bottom end of the three-dimensional reservoir model 4.
During the injection phase, the gas injection high pressure cylinder 311 is opened, and when the value in the pressure gauge 312 reaches a preset injection pressure, the inlet valve 313 is opened. At this time, the inert gas stored in the gas injection high-pressure gas cylinder 311 is injected into the three-dimensional reservoir model 4.
When the injection time reaches the preset time, the inlet valve 313 and the gas injection high-pressure gas cylinder 311 are closed, and the well closing stage is carried out. After a period of well-closing, the back-pressure valve 315 is opened, and the outlet valve 316 is opened, at this time, oil and gas are produced from the huff-and-puff well in the three-dimensional reservoir model 4 driven by the elastic energy generated in the reservoir elastic energy simulation device 320. After produced oil and gas are subjected to oil-gas separation in the oil-gas separation device 317, the gas enters the gas meter 318, and oil bodies are left in the oil-gas separation device 317. Finally, various parameter data in the whole throughput simulation process are collected through the data collecting device 319, so that an actual production scheme is generated according to the collected parameter data.
The throughput simulation system of the embodiment can accurately simulate the elastic energy through the oil reservoir elastic energy simulation device, so that a more effective actual production scheme can be generated according to parameter data collected by a throughput simulation experiment.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. An oil reservoir elastic energy simulation device, comprising: a buffer oil body loading container, a buffer gas loading container and a valve;
one end of the buffer oil body loading container is connected with one end of the buffer gas loading container; the other end of the buffer oil body loading container is connected with the bottom end of a three-dimensional oil reservoir model in the original huff and puff simulation device through the valve;
the buffer oil body loading container is used for loading a first volume of buffer oil body; the buffer gas loading container is used for loading a second volume of buffer gas; the first volume and the second volume are obtained by calculation according to physical parameters of a target oil reservoir and a corresponding three-dimensional oil reservoir model;
the valve is used for being opened when the original huff and puff simulation device simulates huff and puff, and the buffer oil body loading container is communicated with the bottom end of the three-dimensional oil reservoir model, so that the buffer gas pushes the buffer oil body to move towards the three-dimensional oil reservoir model according to the gas elastic energy; and the buffer oil body extrudes the oil body in the bottom end of the three-dimensional oil reservoir model into the huff-puff well in the three-dimensional oil reservoir model according to the elastic energy of the oil body and the elastic energy of the gas.
2. The apparatus of claim 1, further comprising: a fluid communication unit;
one end of the buffer oil body loading container is connected with one end of the buffer gas loading container through the fluid communication unit.
3. The apparatus of claim 2, further comprising: a displacement pump;
the displacement pump is connected with one end of the buffer oil body loading container through the fluid communication unit;
and the displacement pump is used for conveying the buffer oil body into the buffer oil body loading container and adjusting the pressure in the buffer oil body loading container to the formation pressure of the target oil reservoir in the huff and puff simulation preparation stage.
4. The apparatus of claim 2, further comprising: inflating a high-pressure gas cylinder;
the inflatable high-pressure gas cylinder is connected with one end of the buffer gas loading container through the fluid communication unit;
the gas-filled high-pressure gas cylinder is used for conveying the buffer gas into the buffer gas loading container and regulating the pressure in the buffer gas loading container to the formation pressure of a target oil reservoir in a huff and puff simulation preparation stage.
5. A method for constructing an oil reservoir elastic energy simulation device is characterized by comprising the following steps of: a buffer oil body loading vessel, a buffer gas loading vessel, and a valve, the method comprising:
acquiring physical parameters of a target oil reservoir and a corresponding three-dimensional oil reservoir model;
calculating according to the physical parameters to obtain a first volume corresponding to the buffer oil volume and a second volume corresponding to the buffer gas;
setting a buffer oil body loading container according to the first volume, and setting a buffer gas loading container according to the second volume;
and connecting one end of the buffer oil body loading container with one end of the buffer gas loading container, and connecting the other end of the buffer oil body loading container with the bottom end of a three-dimensional oil reservoir model in the primitive huff and puff simulation device through a valve.
6. The method of claim 5, wherein said calculating a first volume corresponding to a volume of buffer oil and a second volume corresponding to a volume of buffer gas from said physical parameter comprises:
calculating to obtain a physical parameter similarity ratio according to the first physical parameter of the target oil reservoir and the first physical parameter of the three-dimensional oil reservoir model;
calculating according to the physical parameter similarity ratio to obtain a compression coefficient ratio;
and calculating to obtain the first volume and the second volume according to the compression coefficient ratio, the second physical parameter of the target oil reservoir, the first physical parameter of the three-dimensional oil reservoir model and the third physical parameter.
7. The method of claim 6, wherein the first physical parameter comprises density, porosity, and reservoir length;
the step of obtaining the physical parameter similarity ratio by calculation according to the first physical parameter of the target oil reservoir and the first physical parameter of the three-dimensional oil reservoir model comprises the following steps:
calculating to obtain a density similarity ratio according to the density of the target oil reservoir and the density of the three-dimensional oil reservoir model;
calculating according to the porosity of the target oil reservoir and the porosity of the three-dimensional oil reservoir model to obtain a porosity similarity ratio;
and calculating to obtain the oil reservoir length similarity ratio according to the oil reservoir length of the target oil reservoir and the oil reservoir length of the three-dimensional oil reservoir model.
8. The method of claim 6, wherein the second physical parameter comprises: formation crude oil compressibility; the third physical parameter includes: volume of the three-dimensional reservoir model;
the calculating according to the compression coefficient ratio, the second physical parameter of the target oil reservoir and the third physical parameter of the three-dimensional oil reservoir model to obtain the first volume and the second volume comprises the following steps:
and calculating to obtain a first volume and a second volume according to the compression coefficient ratio, the formation crude oil compression coefficient, the volume of the three-dimensional oil reservoir model and the porosity of the three-dimensional oil reservoir model through a preset volume calculation formula.
9. The method of claim 8, wherein the predetermined volume calculation formula is:
Vg＝p[(CD-1)CopVrφm-CopVo1]；
Vg+Vo1＝V；
wherein, VgIs a second volume, Vo1Is a first volume, V is preset volume data, VrIs the volume of a three-dimensional reservoir model, phimPorosity, C, for three-dimensional reservoir modelsDIs a compression coefficient ratio, CopIs the formation crude oil compressibility and p is the formation pressure.
10. A throughput simulation system, comprising: a pristine huff and puff simulator and the reservoir elastic energy simulator as claimed in any one of claims 1 to 6;
the primitive huff and puff simulation device is connected with the oil reservoir elastic energy simulation device through the bottom end of the three-dimensional oil reservoir model.
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