CN111027887B - Oil displacement mechanism determining method and system - Google Patents
Oil displacement mechanism determining method and system Download PDFInfo
- Publication number
- CN111027887B CN111027887B CN201911354871.2A CN201911354871A CN111027887B CN 111027887 B CN111027887 B CN 111027887B CN 201911354871 A CN201911354871 A CN 201911354871A CN 111027887 B CN111027887 B CN 111027887B
- Authority
- CN
- China
- Prior art keywords
- displacement
- imbibition
- oil
- displacement mechanism
- target point
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 291
- 230000007246 mechanism Effects 0.000 title claims abstract description 211
- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000011161 development Methods 0.000 claims abstract description 39
- 230000035699 permeability Effects 0.000 claims abstract description 30
- 238000005213 imbibition Methods 0.000 claims description 86
- 238000004590 computer program Methods 0.000 claims description 16
- 238000003860 storage Methods 0.000 claims description 16
- 239000011435 rock Substances 0.000 claims description 7
- 239000003921 oil Substances 0.000 abstract description 187
- 230000008569 process Effects 0.000 abstract description 17
- 238000011084 recovery Methods 0.000 abstract description 16
- 239000010779 crude oil Substances 0.000 abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 31
- 238000002347 injection Methods 0.000 description 12
- 239000007924 injection Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
- G06Q10/063—Operations research, analysis or management
- G06Q10/0631—Resource planning, allocation, distributing or scheduling for enterprises or organisations
- G06Q10/06315—Needs-based resource requirements planning or analysis
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
- G06Q50/02—Agriculture; Fishing; Forestry; Mining
Landscapes
- Business, Economics & Management (AREA)
- Human Resources & Organizations (AREA)
- Engineering & Computer Science (AREA)
- Strategic Management (AREA)
- Economics (AREA)
- Theoretical Computer Science (AREA)
- General Business, Economics & Management (AREA)
- Entrepreneurship & Innovation (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Tourism & Hospitality (AREA)
- Marketing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Primary Health Care (AREA)
- Animal Husbandry (AREA)
- General Health & Medical Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Marine Sciences & Fisheries (AREA)
- Agronomy & Crop Science (AREA)
- Development Economics (AREA)
- Game Theory and Decision Science (AREA)
- Health & Medical Sciences (AREA)
- Educational Administration (AREA)
- Operations Research (AREA)
- Quality & Reliability (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
The invention provides a method and a system for determining an oil displacement mechanism. The oil displacement mechanism determining method comprises the following steps: acquiring a pressure gradient of a target point; generating coordinate points on a standard plate of an oil displacement mechanism according to the permeability of a target point and the pressure gradient of the target point, which are acquired in advance; the oil displacement mechanism standard plate comprises a plurality of oil displacement mechanism areas; and determining an oil displacement mechanism corresponding to the oil displacement mechanism region where the coordinate point is located so as to create or adjust an oil reservoir development scheme. The invention can rapidly and accurately determine the oil displacement mechanism to adjust the development scheme of the oil and gas field, provides a reference basis for the selection of the exploitation mode in the oil reservoir development process, and further improves the recovery ratio of crude oil.
Description
Technical Field
The invention relates to the technical field of oil reservoir development, in particular to a method and a system for determining an oil displacement mechanism.
Background
With the deep development of exploration, hypotonic-tight reservoirs are developing into hot spots for exploration and development. The high-efficiency reasonable development of the hypotonic-dense oil reservoir is significant for guaranteeing national energy safety. Micro-nano pores of the hypotonic-dense oil reservoir are widely developed, the permeability and the porosity are very low, and the exploitation difficulty is very high. In the water flooding development process, two reservoir oil displacement mechanisms of displacement oil extraction and imbibition oil extraction exist. In-situ practice also shows that under stratum conditions, the imbibition process and the displacement process act on the oil reservoir development process simultaneously, but the oil displacement mechanism is dominant in the displacement or imbibition. The oil displacement mechanism of the oil reservoir is clarified, and the method has important guiding significance for further developing the oil reservoir and improving the oil reservoir recovery ratio.
In water flooding, the pressure drop is large near the water injection well and the production well, but small elsewhere between the well and the well. In conventional reservoirs, when the displacement pressure is large (capillary forces can be ignored), displacement is the main mechanism of this part of reservoir development. When the displacement pressure is small, it is considered that imbibition plays a dominant role. However, in the hypotonic-dense oil reservoir, the capillary force is large due to the small capillary radius, and the imbibition effect is not negligible, so that no quantitative standard exists for rapidly judging the oil displacement mechanism in the hypotonic-dense oil reservoir.
Disclosure of Invention
The embodiment of the invention mainly aims to provide a method and a system for determining an oil displacement mechanism, so as to rapidly and accurately determine the oil displacement mechanism, and provide a reference basis for selection of a mining mode in the oil reservoir development process.
In order to achieve the above object, an embodiment of the present invention provides a method for determining an oil displacement mechanism, including:
acquiring a pressure gradient of a target point;
generating coordinate points on a standard plate of an oil displacement mechanism according to the permeability of a target point and the pressure gradient of the target point, which are acquired in advance; the oil displacement mechanism standard plate comprises a plurality of oil displacement mechanism areas;
and determining an oil displacement mechanism corresponding to the oil displacement mechanism region where the coordinate point is located so as to create or adjust an oil reservoir development scheme.
The embodiment of the invention also provides a system for determining the oil displacement mechanism, which comprises the following steps:
the pressure gradient unit is used for acquiring the pressure gradient of the target point;
the coordinate point unit is used for generating a coordinate point on the oil displacement mechanism standard plate according to the permeability of the target point and the pressure gradient of the target point, which are acquired in advance; the oil displacement mechanism standard plate comprises a plurality of oil displacement mechanism areas;
and the oil displacement mechanism determining unit is used for determining an oil displacement mechanism corresponding to the oil displacement mechanism region where the coordinate point is located so as to create or adjust an oil reservoir development scheme.
The embodiment of the invention also provides computer equipment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the steps of the oil displacement mechanism determining method when executing the computer program.
The embodiment of the invention also provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and the computer program realizes the steps of the oil displacement mechanism determining method when being executed by a processor.
According to the oil displacement mechanism determining method and system, the pressure gradient of the target point is firstly obtained, then the coordinate point is generated on the oil displacement mechanism standard plate according to the permeability of the target point and the pressure gradient of the target point, and finally the oil displacement mechanism corresponding to the oil displacement mechanism area where the coordinate point is located is determined to create or adjust the oil reservoir development scheme, so that the oil displacement mechanism can be rapidly and accurately determined to adjust the oil and gas field development scheme, a reference basis is provided for selection of exploitation modes in the oil reservoir development process, and the recovery ratio of crude oil is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method of determining a displacement mechanism in an embodiment of the present invention;
FIG. 2 is a flow chart of establishing a standard plate of an oil displacement mechanism in an embodiment of the invention;
FIG. 3 is a schematic diagram of oil-water displacement-imbibition of a single capillary tube in an embodiment of the invention;
FIG. 4 is a double-logarithmic plot of the capillary radius and the ratio of capillary force to displacement pressure in an embodiment of the invention;
FIG. 5 is a schematic diagram of a standard plate of an oil displacement mechanism in an embodiment of the invention;
FIG. 6 is a graph showing the relationship between pressure and distance in an embodiment of the present invention;
FIG. 7 is a schematic illustration of a standard plate of the displacement mechanism in another embodiment of the present invention;
FIG. 8 is a schematic illustration of a displacement mechanism plate in an embodiment of the invention;
FIG. 9 is a block diagram of a flooding mechanism determination system in an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Those skilled in the art will appreciate that embodiments of the invention may be implemented as a system, apparatus, device, method, or computer program product. Accordingly, the present disclosure may be embodied in the following forms, namely: complete hardware, complete software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software.
In view of the fact that the oil displacement mechanism in the hypotonic-dense oil reservoir cannot be judged rapidly in the prior art, the embodiment of the invention provides an oil displacement mechanism determining method for determining the oil displacement mechanism rapidly and accurately, and provides a reference basis for selection of exploitation modes in the oil reservoir development process. The present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a flow chart of a method of determining a displacement mechanism in an embodiment of the invention. As shown in fig. 1, the oil displacement mechanism determining method includes:
s101: and acquiring the pressure gradient of the target point.
S102: generating coordinate points on a standard plate of an oil displacement mechanism according to the permeability of a target point and the pressure gradient of the target point, which are acquired in advance; the displacement mechanism standard template includes a plurality of displacement mechanism regions.
The oil displacement mechanism area comprises a imbibition oil displacement mechanism area, a displacement oil displacement mechanism area and a imbibition-displacement oil displacement mechanism area.
S103: and determining an oil displacement mechanism corresponding to the oil displacement mechanism region where the coordinate point is located so as to create or adjust an oil reservoir development scheme.
The execution subject of the flooding mechanism determination method shown in fig. 1 may be a computer. As can be seen from the flow shown in FIG. 1, the oil displacement mechanism determining method in the embodiment of the invention firstly obtains the pressure gradient of the target point, then generates coordinate points on the oil displacement mechanism standard plate according to the permeability of the target point and the pressure gradient of the target point, and finally determines the oil displacement mechanism corresponding to the oil displacement mechanism area where the coordinate points are positioned to create or adjust the oil reservoir development scheme, so that the oil displacement mechanism can be quickly and accurately determined to adjust the oil and gas field development scheme, a reference basis is provided for selection of the exploitation mode in the oil reservoir development process, and the recovery ratio of crude oil is further improved.
In one embodiment, S101 includes:
determining the pressure of the target point according to the stratum parameters of the target point acquired in advance; the formation parameters include the distance of the target point from each well.
Wherein the formation parameters further comprise: viscosity, permeability of the core, formation thickness, and production per well.
The pressure at the target point is determined by the following formula:
wherein P is the pressure of the target point, P i Is the pressure of the ith well, mu is viscosity, k is the permeability of the core, h is the stratum thickness, Q i Yield of the ith well (positive value of oil production well and negative value of water injection well), l i Is the distance between the target point and the ith well.
And determining the pressure gradient of the target point according to the pressure of the target point and the distance between the target point and each well.
FIG. 2 is a flow chart of establishing a standard plate of an oil displacement mechanism in an embodiment of the invention. As shown in fig. 2, establishing the flooding mechanism standard template includes:
s201: and determining the imbibition parameters according to the rock physical parameters and preset imbibition standards.
Wherein, petrophysical parameters include: surface tension, contact angle, core length, tortuosity, and porosity.
In one embodiment, the imbibition parameters are determined by the imbibition parameter model:
wherein a is 1 As the imbibition parameter, eta 1 The permeability standard is that sigma is surface tension, theta is contact angle, L is core length, tau is tortuosity, and phi is porosity.
S202: generating a imbibition boundary according to imbibition parameters and a preset imbibition model.
In one embodiment, the imbibition boundary is expressed as:
wherein k is the permeability of the core, delta P is the pressure difference between two ends of the core,is a pressure gradient.
S203: and determining displacement parameters according to the petrophysical parameters and preset displacement standards.
In one embodiment, the displacement parameters are determined by a displacement parameter model as follows:
wherein a is 2 For displacement parameters, eta 2 Is a displacement standard.
S204: and generating a displacement boundary line according to the displacement parameters and a preset displacement model.
In one embodiment, the displacement parting line is expressed as:
s205: and establishing a standard plate of the oil displacement mechanism according to the imbibition dividing line and the displacement dividing line.
In one embodiment, S205 includes: taking a closed area formed by a imbibition dividing line and a coordinate axis as an imbibition displacement mechanism area; taking a closed area formed by the imbibition dividing line, the displacement dividing line and the coordinate axis as an imbibition-displacement oil displacement mechanism area; and taking an open area formed by the displacement dividing line and the coordinate axis as a displacement oil displacement mechanism area.
The imbibition boundary expression and displacement boundary expression are derived as follows:
based on a capillary bundle model, the actual core is equivalent to an ideal porous medium with the pore space consisting of parallel Mao Guanshu with equal diameter.
The capillary radius r can be expressed as:
core-bound water saturation of S wi The saturation of the residual oil is S or Effective pore throat radius r e Can be expressed as:
fig. 3 is a schematic diagram of oil-water displacement-imbibition of a single capillary tube in an embodiment of the invention. A complex sandstone system can be equivalently formed from multiple capillary tubes as shown in fig. 3. The actual length of the core in fig. 3 can be calculated using the tortuosity τ. As shown in fig. 3, in a single capillary, considering the pressure difference between two ends of the capillary, and not considering gravity, it can be obtained according to newton's second law:
F p +F c +f＝ma； (3)
displacement pressure F p The method comprises the following steps:
F p ＝πr e 2 Δp； (4)
capillary force F c The method comprises the following steps:
the viscous force f is:
f＝2πr e xτ w +2πr e (L-x)τ o ； (6)
wherein the shear stress of water isThe shear stress of the oil is +.>Viscosity of water is mu w The method comprises the steps of carrying out a first treatment on the surface of the The viscosity of the oil is mu o The method comprises the steps of carrying out a first treatment on the surface of the L is the capillary length (core length); x is the distance between the oil-water interface and one end of the capillary (core); a is acceleration; m is the total mass of oil and water in the capillary; v is the velocity of the fluid.
After bringing equations (4), (5) and (6) into equation (3), we develop:
πr e 2 Δp+2πr e σcosθ+2πr e xτ w +2πr e (L-x)τ o ＝πr e 2 [ρ w x+ρ o (L-x)]a； (7)
wherein ρ is w Is the density of water; ρ o Is the density of the oil; speed of the speedIs +.>Is obtained after the differential form of (2) is introduced into equation (7):
neglecting the second derivative term, the simplification is as follows:
after integrating equation (9), we get:
4(μ w -μ o )x 2 +8μ o Lx-(r e 2 Δp+2reσcosθ)t＝0； (10)
wherein t is time. The equation (10) can be used to obtain:
speed of speedThe method comprises the following steps:
the time required for the oil-water interface to reach the other end of the core is as follows:
when the displacement pressure is not considered and only imbibition is used as an oil displacement mechanism, the time required for an oil-water interface to reach the other end of the core is as follows:
when the capillary force is not considered and only displacement is used as an oil displacement mechanism, the time required for the oil-water interface to reach the other end of the core is as follows:
in order to judge the type of oil displacement mechanism (a imbibition oil displacement mechanism, a displacement oil displacement mechanism and a imbibition-displacement oil displacement mechanism) of the compact-hypotonic oil reservoir, the movement speed of an oil-water interface under different conditions is calculated. When the displacement pressure and the capillary force act simultaneously, the average moving speed of the oil-water interface is as follows:
when displacement pressure is not considered and only imbibition is used as an oil displacement mechanism, the average moving speed of an oil-water interface is as follows:
when the capillary force is not considered and only displacement is used as an oil displacement mechanism, the average moving speed of the oil-water interface is as follows:
establishing imbibition standard and displacement standard:
as can be seen from equation (13), as the permeability increases, the capillary radius increases, the imbibition effect of the displacement pressure on the individual capillary increases gradually, and the capillary radius decreases gradually, which means that the displacement pressure affects the imbibition process, mainly on the relatively larger part of the capillary radius, and the capillary force affects the relatively smaller part of the capillary radius. Therefore, there must be a range of capillary radii, a smaller portion than this range, with capillary forces dominate the belt pressure displacement imbibition process. Where the displacement pressure is greater than this value, it dominates. Thus, η is to 1 The method comprises the following steps of:
the same principle can be obtained:
from the equation (20) and the equation (21), η can be seen 1 Value sum eta of (2) 2 The values of (2) are related to the ratio of capillary force to displacement pressure, and thus a double-log plot of capillary radius and the ratio of capillary force to displacement pressure can be established. Fig. 4 is a double-logarithmic plot of the capillary radius and the ratio of capillary force to displacement pressure in an embodiment of the invention. As shown in FIG. 4, when η 1 And eta 2 And when the two areas are 70%, dividing the double-logarithmic graph into three areas, namely a imbibition oil displacement mechanism area, a displacement oil displacement mechanism area and a imbibition-displacement oil displacement mechanism area by virtue of dotted lines. The two slopes in FIG. 4 are the relationship between the ratio of capillary force to displacement pressure and the capillary radius at a pressure gradient of 0.08MPa/m, and the relationship between the ratio of capillary force to displacement pressure and the capillary radius at a pressure gradient of 0.8MPa/m, respectively.
The simplification of the formula (1) and the formula (20) can be obtained:
the simplification of the formula (1) and the formula (21) can be obtained:
FIG. 5 is an embodiment of the present inventionSchematic of a standard plate of an oil displacement mechanism in examples. As shown in FIG. 5, FIG. 5 is a bi-logarithmic graph with permeability k on the abscissa and pressure gradient on the ordinateWhen eta 1 And eta 2 All 70% by ∈>(imbibition dividing line) and +.>The (displacement parting line) may divide the bipartite graph into three regions, a imbibition displacement mechanism region, a displacement mechanism region, and a imbibition-displacement mechanism region, respectively. It can be seen that the displacement mechanism of the core at point a in fig. 5 is a imbibition displacement mechanism, and if the displacement pressure is expected to play a greater role, the point a needs to be moved up to the point B. However, it can be seen at point B that a large pressure gradient (110 MPa/m) is required to make the flooding mechanism a displacement flooding mechanism. Based on equipment and economic considerations, it is not practical in the field. Thus, it is considered that the oil recovery of crude oil should be enhanced by utilizing a imbibition displacement mechanism for this portion of the reservoir.
The specific flow of the embodiment of the invention is as follows:
1. and determining the pressure of the target point according to the viscosity, the permeability of the core, the stratum thickness, the yield of each well and the distance between the target point and each well.
For example, if there is one oil production well and one water injection well, the pressure of the target point is:
2. and determining the pressure gradient of the target point according to the pressure of the target point and the distance between the target point and each well.
FIG. 6 is a graph showing the relationship between pressure and distance in an embodiment of the present invention. When there is one oil well and one water injection well in common, the relationship between the pressure of the target point and the distance between the target point and the oil well is shown in fig. 6. For example, the coordinates of the point D are (5 m,10 mpa/m); the coordinates of the E point are (500 m,1 mpa/m); the coordinates of the point F are (125 m,0.5 mpa/m); the coordinates of the G point were (250 m,0.15 mpa/m). And obtaining the gradient of the target point on the relation curve to obtain the pressure gradient of the target point.
3. And determining the imbibition parameters according to imbibition standards, surface tension, contact angle, core length, tortuosity and porosity. Generating a imbibition boundary according to imbibition parameters and a preset imbibition model. The displacement parameters are determined according to displacement criteria, surface tension, contact angle, core length, tortuosity, and porosity. And generating a displacement boundary line according to the displacement parameters and a preset displacement model.
The parameters Dan Wuxing of the rock such as the imbibition standard, the surface tension, the contact angle, the core length, the tortuosity and the porosity are all historical petrophysical parameters of the area where the target point is located.
4. Establishing an oil displacement mechanism standard chart according to the imbibition dividing line and the displacement dividing line: taking a closed area formed by a imbibition dividing line and a coordinate axis as an imbibition displacement mechanism area; taking a closed area formed by the imbibition dividing line, the displacement dividing line and the coordinate axis as an imbibition-displacement oil displacement mechanism area; and taking an open area formed by the displacement dividing line and the coordinate axis as a displacement oil displacement mechanism area.
FIG. 7 is a schematic illustration of a standard plate of the displacement mechanism in another embodiment of the present invention. As shown in FIG. 7, permeability k is plotted on the abscissa and pressure gradient is plotted on the ordinateWhen eta 1 And eta 2 All 70% by ∈>Andthe bipartite graph can be divided into three areas, namely a imbibition displacement mechanism area, a displacement mechanism area and a imbibition-displacement mechanism area。
5. And generating coordinate points on the oil displacement mechanism standard plate according to the permeability of the target point and the pressure gradient of the target point, which are acquired in advance.
TABLE 1
| Rock physical parameters | Point D | E point | F point | G point |
| Permeability (mD) | 10 | 3 | 0.9 | 0.3 |
| Porosity (%) | 9.5 | 9.8 | 10 | 9.7 |
| Tortuosity of | 1.1 | 1.2 | 1.15 | 1.2 |
| Pressure gradient (Mpa/m) | 10 | 1 | 0.5 | 0.15 |
| Contact angle (°) | 80 | 75 | 80 | 70 |
| Surface tension (mN/m) | 35.5 | 35.5 | 35.5 | 35.5 |
Table 1 shows petrophysical parameters of points D, E, F and G in FIG. 7.
6. And determining an oil displacement mechanism corresponding to the oil displacement mechanism region where the coordinate point is located.
As shown in fig. 7, the displacement mechanism at point D is a displacement mechanism, and at point E, which is 50m from the vicinity of the bottom of the well, the displacement mechanism is a imbibition-displacement mechanism. The displacement mechanism at the point F and the point G is a imbibition displacement mechanism. Therefore, if the recovery ratio is to be improved, the spontaneous imbibition efficiency should be improved when the oil displacement mechanism is imbibition oil displacement mechanism. When the displacement mechanism is a displacement mechanism, the action of the displacement pressure on the oil reservoir should be increased.
FIG. 8 is a schematic diagram of a plate of an flooding mechanism in an embodiment of the invention. Fig. 8 can be obtained from fig. 6 and 7. The average permeability in fig. 8 is 0.8mD, and as shown in fig. 8, the reservoir can be divided into five parts, and in the area close to the water injection well and the oil production well, the pressure gradient is large, and the oil displacement mechanism is a displacement oil displacement mechanism. In the middle area far away from the water injection well and the oil production well, the pressure gradient is small, and the oil displacement mechanism is a imbibition oil displacement mechanism. The other two areas are imbibition-displacement flooding mechanisms.
When the oil displacement mechanism is a imbibition oil displacement mechanism, the recovery ratio of crude oil can be improved by the following modes:
1. raising the temperature: the temperature rise changes the wettability of the rock, the viscosity of crude oil and the water film on the pore wall surface, which is favorable for the imbibition effect.
2. Adding a surfactant: and surfactant is injected to enable the oleophylic tight reservoir to generate wettability reversal, induce spontaneous imbibition and improve the oil reservoir development effect.
3. And nano-particles are added for oil displacement, so that the residual oil consumption, the oil displacement efficiency and the recovery ratio of crude oil are improved.
When the oil displacement mechanism is a imbibition-displacement oil displacement mechanism, the recovery ratio of crude oil can be improved by the following modes:
1. and the well spacing is reasonable, the water injection pressure is reasonably increased, effective driving is established, the effective displacement process is improved, and the recovery ratio of crude oil is improved by utilizing the effective driving pressure.
2. The effective imbibition process is obtained by means of adding a surfactant, increasing the temperature, changing the wettability and the like, and the recovery ratio of crude oil is improved by imbibition.
3. The pressure gradient is increased, so that the imbibition-displacement oil displacement mechanism can be gradually converted into the displacement oil displacement mechanism.
When the oil displacement mechanism is a displacement mechanism, the recovery ratio of crude oil can be improved by the following modes:
1. the water injection pressure is improved, and the water injection strength and the water injection quantity are properly improved.
2. Well pattern is perfected, encryption wells are drilled, and well spacing is reduced.
3. And (3) separate-layer water injection, improving the heterogeneity of a reservoir, improving the water wave and volume, improving the effective use thickness of low permeability layer water injection, and establishing effective displacement.
In summary, the oil displacement mechanism determining method of the embodiment of the invention firstly obtains the pressure gradient of the target point, then generates a coordinate point on the oil displacement mechanism standard plate according to the permeability of the target point and the pressure gradient of the target point which are obtained in advance, finally determines the oil displacement mechanism corresponding to the oil displacement mechanism area where the coordinate point is positioned to create or adjust the oil reservoir development scheme, can rapidly and accurately determine the oil displacement mechanism to adjust the oil and gas field development scheme, provides a reference basis for the selection of the exploitation mode in the oil reservoir development process, and further improves the recovery ratio of crude oil.
Based on the same inventive concept, the embodiment of the invention also provides a system for determining the oil displacement mechanism, and because the principle of solving the problem of the system is similar to that of the oil displacement mechanism determining method, the implementation of the system can be referred to the implementation of the method, and the repetition is omitted.
FIG. 9 is a block diagram of a flooding mechanism determination system in an embodiment of the present invention. As shown in fig. 9, the flooding mechanism determination system includes:
the pressure gradient unit is used for acquiring the pressure gradient of the target point;
the coordinate point unit is used for generating a coordinate point on the oil displacement mechanism standard plate according to the permeability of the target point and the pressure gradient of the target point, which are acquired in advance; the oil displacement mechanism standard plate comprises a plurality of oil displacement mechanism areas;
and the oil displacement mechanism determining unit is used for determining an oil displacement mechanism corresponding to the oil displacement mechanism region where the coordinate point is located so as to create or adjust an oil reservoir development scheme.
In one of these embodiments, the pressure gradient unit is specifically configured to:
determining the pressure of the target point according to the stratum parameters of the target point acquired in advance; the stratum parameters comprise the distance between the target point and each well;
and determining the pressure gradient of the target point according to the pressure of the target point and the distance between the target point and each well.
In one embodiment, the method further comprises: a plate establishing unit for:
determining imbibition parameters according to rock physical parameters and preset imbibition standards;
generating a imbibition boundary according to imbibition parameters and a preset imbibition model;
determining displacement parameters according to the petrophysical parameters and preset displacement standards;
generating a displacement boundary according to the displacement parameters and a preset displacement model;
and establishing a standard plate of the oil displacement mechanism according to the imbibition dividing line and the displacement dividing line.
In one embodiment, the displacement mechanism zone includes a imbibition displacement mechanism zone, a displacement mechanism zone, and a imbibition-displacement mechanism zone;
the plate establishing unit is specifically used for:
taking a closed area formed by a imbibition dividing line and a coordinate axis as an imbibition displacement mechanism area;
taking a closed area formed by the imbibition dividing line, the displacement dividing line and the coordinate axis as an imbibition-displacement oil displacement mechanism area;
and taking an open area formed by the displacement dividing line and the coordinate axis as a displacement oil displacement mechanism area.
In summary, the oil displacement mechanism determining system of the embodiment of the invention firstly acquires the pressure gradient of the target point, then generates a coordinate point on the oil displacement mechanism standard plate according to the permeability of the target point and the pressure gradient of the target point, and finally determines the oil displacement mechanism corresponding to the oil displacement mechanism area where the coordinate point is positioned to create or adjust the oil reservoir development scheme, so that the oil displacement mechanism can be rapidly and accurately determined to adjust the oil and gas field development scheme, a reference basis is provided for selection of the exploitation mode in the oil reservoir development process, and the recovery ratio of crude oil is further improved.
The embodiment of the invention also provides a computer device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor can realize all or part of the content of the oil displacement mechanism determining method when executing the computer program, for example, the processor can realize the following content when executing the computer program:
acquiring a pressure gradient of a target point;
generating coordinate points on a standard plate of an oil displacement mechanism according to the permeability of a target point and the pressure gradient of the target point, which are acquired in advance; the oil displacement mechanism standard plate comprises a plurality of oil displacement mechanism areas;
and determining an oil displacement mechanism corresponding to the oil displacement mechanism region where the coordinate point is located so as to create or adjust an oil reservoir development scheme.
In summary, the computer equipment of the embodiment of the invention firstly acquires the pressure gradient of the target point, then generates a coordinate point on the oil displacement mechanism standard plate according to the permeability of the target point and the pressure gradient of the target point which are acquired in advance, finally determines the oil displacement mechanism corresponding to the oil displacement mechanism area where the coordinate point is positioned to create or adjust the oil reservoir development scheme, can rapidly and accurately determine the oil displacement mechanism to adjust the oil and gas field development scheme, provides a reference basis for selection of the exploitation mode in the oil reservoir development process, and further improves the recovery ratio of crude oil.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, the computer program can implement all or part of the oil displacement mechanism determining method when being executed by a processor, for example, the processor can implement the following contents when executing the computer program:
acquiring a pressure gradient of a target point;
generating coordinate points on a standard plate of an oil displacement mechanism according to the permeability of a target point and the pressure gradient of the target point, which are acquired in advance; the oil displacement mechanism standard plate comprises a plurality of oil displacement mechanism areas;
and determining an oil displacement mechanism corresponding to the oil displacement mechanism region where the coordinate point is located so as to create or adjust an oil reservoir development scheme.
In summary, the computer readable storage medium of the embodiment of the invention firstly acquires the pressure gradient of the target point, then generates a coordinate point on the oil displacement mechanism standard plate according to the permeability of the target point and the pressure gradient of the target point which are acquired in advance, finally determines the oil displacement mechanism corresponding to the oil displacement mechanism area where the coordinate point is positioned to create or adjust the oil reservoir development scheme, can quickly and accurately determine the oil displacement mechanism to adjust the oil and gas field development scheme, provides a reference basis for the selection of the exploitation mode in the oil reservoir development process, and further improves the recovery ratio of crude oil.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Those of skill in the art will further appreciate that the various illustrative logical blocks (illustrative logical block), units, and steps described in connection with the embodiments of the invention may be implemented by electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components (illustrative components), elements, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design requirements of the overall system. Those skilled in the art may implement the described functionality in varying ways for each particular application, but such implementation is not to be understood as beyond the scope of the embodiments of the present invention.
The various illustrative logical blocks, or units, or devices described in the embodiments of the invention may be implemented or performed with a general purpose processor, a digital signal processor, an Application Specific Integrated Circuit (ASIC), a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described. A general purpose processor may be a microprocessor, but in the alternative, the general purpose processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. In an example, a storage medium may be coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC, which may reside in a user terminal. In the alternative, the processor and the storage medium may reside as distinct components in a user terminal.
In one or more exemplary designs, the above-described functions of embodiments of the present invention may be implemented in hardware, software, firmware, or any combination of the three. If implemented in software, the functions may be stored on a computer-readable medium or transmitted as one or more instructions or code on the computer-readable medium. Computer readable media includes both computer storage media and communication media that facilitate transfer of computer programs from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer. For example, such computer-readable media may include, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that may be used to carry or store program code in the form of instructions or data structures and other data structures that may be read by a general or special purpose computer, or a general or special purpose processor. Further, any connection is properly termed a computer-readable medium, e.g., if the software is transmitted from a website, server, or other remote source via a coaxial cable, fiber optic cable, twisted pair, digital Subscriber Line (DSL), or wireless such as infrared, radio, and microwave, and is also included in the definition of computer-readable medium. The disks (disks) and disks (disks) include compact disks, laser disks, optical disks, DVDs, floppy disks, and blu-ray discs where disks usually reproduce data magnetically, while disks usually reproduce data optically with lasers. Combinations of the above may also be included within the computer-readable media.
Claims (8)
1. The method for determining the oil displacement mechanism is characterized by comprising the following steps of:
acquiring a pressure gradient of a target point;
generating a coordinate point on a standard plate of an oil displacement mechanism according to the permeability of a target point and the pressure gradient of the target point, which are acquired in advance; the oil displacement mechanism standard plate comprises a plurality of oil displacement mechanism areas;
determining an oil displacement mechanism corresponding to the oil displacement mechanism region where the coordinate point is located so as to create or adjust an oil reservoir development scheme;
the oil displacement mechanism determining method further comprises the following steps:
determining imbibition parameters according to rock physical parameters and preset imbibition standards;
generating a imbibition boundary according to the imbibition parameter and a preset imbibition model;
determining displacement parameters according to the petrophysical parameters and preset displacement standards;
generating a displacement boundary according to the displacement parameters and a preset displacement model;
establishing the oil displacement mechanism standard chart according to the imbibition dividing line and the displacement dividing line;
the expression of the imbibition boundary is:
wherein k is the permeability of the core, alpha P is the pressure difference between two ends of the core,a is a pressure gradient 1 The seepage and suction parameters are adopted, and L is the length of the core;
the expression of the displacement demarcation line is:
wherein a is 2 Is a displacement parameter.
2. The flooding mechanism determination method of claim 1, wherein obtaining a pressure gradient of the target point comprises:
determining the pressure of the target point according to the stratum parameters of the target point acquired in advance; the stratum parameters comprise the distance between the target point and each well;
and determining the pressure gradient of the target point according to the pressure of the target point and the distance between the target point and each well.
3. The flooding mechanism determination method according to claim 1, wherein said flooding mechanism region includes a imbibition flooding mechanism region, a displacement flooding mechanism region, and a imbibition-displacement flooding mechanism region;
the establishing of the oil displacement mechanism standard chart comprises the following steps:
taking a closed area formed by the imbibition dividing line and the coordinate axis as an imbibition displacement mechanism area;
taking a closed area formed by the imbibition dividing line, the displacement dividing line and the coordinate axis as an imbibition-displacement oil displacement mechanism area;
and taking an open area formed by the displacement dividing line and the coordinate axis as a displacement oil displacement mechanism area.
4. A flooding mechanism determination system, comprising:
the pressure gradient unit is used for acquiring the pressure gradient of the target point;
the coordinate point unit is used for generating a coordinate point on the oil displacement mechanism standard plate according to the permeability of the target point and the pressure gradient of the target point, which are acquired in advance; the oil displacement mechanism standard plate comprises a plurality of oil displacement mechanism areas;
the oil displacement mechanism determining unit is used for determining an oil displacement mechanism corresponding to the oil displacement mechanism region where the coordinate point is located so as to create or adjust an oil reservoir development scheme;
the flooding mechanism determination system further includes: a plate establishing unit for:
determining imbibition parameters according to rock physical parameters and preset imbibition standards;
generating a imbibition boundary according to the imbibition parameter and a preset imbibition model;
determining displacement parameters according to the petrophysical parameters and preset displacement standards;
generating a displacement boundary according to the displacement parameters and a preset displacement model;
establishing the oil displacement mechanism standard chart according to the imbibition dividing line and the displacement dividing line;
the expression of the imbibition boundary is:
wherein k is the permeability of the core, delta P is the pressure difference between two ends of the core,a is a pressure gradient 1 The seepage and suction parameters are adopted, and L is the length of the core;
the expression of the displacement demarcation line is:
wherein a is 2 Is a displacement parameter.
5. The flooding mechanism determination system of claim 4, wherein the pressure gradient unit is specifically configured to:
determining the pressure of the target point according to the stratum parameters of the target point acquired in advance; the stratum parameters comprise the distance between the target point and each well;
and determining the pressure gradient of the target point according to the pressure of the target point and the distance between the target point and each well.
6. The flooding mechanism determination system of claim 4, wherein said flooding mechanism zone comprises a imbibition flooding mechanism zone, a displacement flooding mechanism zone, and a imbibition-displacement flooding mechanism zone;
the plate establishing unit is specifically used for:
taking a closed area formed by the imbibition dividing line and the coordinate axis as an imbibition displacement mechanism area;
taking a closed area formed by the imbibition dividing line, the displacement dividing line and the coordinate axis as an imbibition-displacement oil displacement mechanism area;
and taking an open area formed by the displacement dividing line and the coordinate axis as a displacement oil displacement mechanism area.
7. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the flooding mechanism determination method of any one of claims 1 to 3 when the computer program is executed by the processor.
8. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the flooding mechanism determination method of any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911354871.2A CN111027887B (en) | 2019-12-25 | 2019-12-25 | Oil displacement mechanism determining method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911354871.2A CN111027887B (en) | 2019-12-25 | 2019-12-25 | Oil displacement mechanism determining method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111027887A CN111027887A (en) | 2020-04-17 |
| CN111027887B true CN111027887B (en) | 2024-03-05 |
Family
ID=70213086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911354871.2A Active CN111027887B (en) | 2019-12-25 | 2019-12-25 | Oil displacement mechanism determining method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111027887B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114858678B (en) * | 2021-02-04 | 2024-06-25 | 中国石油天然气股份有限公司 | Core imbibition parameter measurement method for unconventional oil reservoir |
| CN115078163A (en) * | 2022-08-05 | 2022-09-20 | 西南石油大学 | Shale oil reservoir rock wettability characterization method |
| CN115450595B (en) * | 2022-09-08 | 2023-06-20 | 中海石油(中国)有限公司深圳分公司 | Water control tool selection method and device, electronic equipment and storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106285582A (en) * | 2016-09-18 | 2017-01-04 | 广东石油化工学院 | Note CO2oil reservoirs CO2mixed phase region decision method |
| CN109100384A (en) * | 2018-08-21 | 2018-12-28 | 中国石油天然气股份有限公司 | Compact oil reservoir water drive oil microcosmic mechanism information determines method, apparatus and system |
| CN109339752A (en) * | 2018-11-19 | 2019-02-15 | 中国石油天然气股份有限公司大港油田分公司 | Oil reservoir development method based on the phlogisticated air displacement of reservoir oil |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11473004B2 (en) * | 2016-12-02 | 2022-10-18 | University Of Wyoming | Microemulsions and uses thereof to displace oil in heterogeneous porous media |
-
2019
- 2019-12-25 CN CN201911354871.2A patent/CN111027887B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106285582A (en) * | 2016-09-18 | 2017-01-04 | 广东石油化工学院 | Note CO2oil reservoirs CO2mixed phase region decision method |
| CN109100384A (en) * | 2018-08-21 | 2018-12-28 | 中国石油天然气股份有限公司 | Compact oil reservoir water drive oil microcosmic mechanism information determines method, apparatus and system |
| CN109339752A (en) * | 2018-11-19 | 2019-02-15 | 中国石油天然气股份有限公司大港油田分公司 | Oil reservoir development method based on the phlogisticated air displacement of reservoir oil |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111027887A (en) | 2020-04-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111027887B (en) | Oil displacement mechanism determining method and system | |
| CN105626006B (en) | Low-permeability oil deposit CO2Drive technical limit well space and determine method | |
| CN111274528B (en) | Reservoir fracture imbibition quality prediction method and system | |
| CN104314547A (en) | HAFD segmented optimization method and system | |
| CN104453876A (en) | Method and device for predicting oil and gas yield of compact oil and gas reservoir horizontal well | |
| CN110107277B (en) | Method for obtaining volume of karst cave encountered by well drilling in carbonate reservoir | |
| WO2015073030A1 (en) | Optimizing flow control device properties for a liquid injection well using a coupled wellbore-reservoir model | |
| CN110410045B (en) | Plugging and adjusting method for oil reservoir in ultrahigh water cut period | |
| CN105899756A (en) | Optimizing flow control device properties on both producer and injector wells in coupled injector-producer liquid flooding systems | |
| CN116306385B (en) | Oil reservoir fracturing imbibition energy increasing numerical simulation method, system, equipment and medium | |
| CN111335853B (en) | Method and device for determining effective water injection amount of strong edge water reservoir during edge external water injection development | |
| CN112377182B (en) | Method and device for determining parameters of large-scale hole crack type carbonate reservoir | |
| US10520925B2 (en) | Optimizing flow control device properties on a producer well in coupled injector-producer liquid flooding systems | |
| CN109933951B (en) | Method for establishing multi-scale and multi-mechanism coupling seepage model of tight oil reservoir volume fracturing horizontal well | |
| CN105829644A (en) | Optimized acidizing of a production well near aquifer | |
| AU2014379558A1 (en) | Optimized acidizing of production and injection wells | |
| WO2021022684A1 (en) | Method and device for determining injection capacity during alternate injection of water and gas | |
| CN106869880B (en) | A kind of sandstone reservoir acidization tool | |
| CN114429014A (en) | Horizontal well intimate-cutting volume fracturing design method and device, electronic equipment and medium | |
| CN114508332A (en) | Fracture-cave carbonate reservoir acid fracturing method and device | |
| CN112949881A (en) | Low-permeability reservoir yield prediction method and prediction model construction method | |
| Wang et al. | Numerical Investigation of Oil–Water Exchange Behaviors in Shale During Post-Fracturing Soaking Periods | |
| CN113051698A (en) | Method and system for determining closing time of intermittent gas well | |
| CN113530534A (en) | Reservoir transformation method and device | |
| CN110847878A (en) | Method and system for determining acid injection amount of sectional acidification of horizontal well of heterogeneous carbonate rock |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |