CN112443309A - Method and device for determining injection well position information - Google Patents

Method and device for determining injection well position information Download PDF

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CN112443309A
CN112443309A CN201910829037.8A CN201910829037A CN112443309A CN 112443309 A CN112443309 A CN 112443309A CN 201910829037 A CN201910829037 A CN 201910829037A CN 112443309 A CN112443309 A CN 112443309A
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well
production
injection well
production well
reference injection
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CN112443309B (en
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梁斌
王权国
王喜梅
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Petrochina Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells

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Abstract

The application discloses a method and a device for determining position information of an injection well, and relates to the technical field of oil and gas development. The method may determine location information for the injection wells based on the location information for each production well and a weight for the location information. Since the weight of the position information of each production well is used for representing the time required by the crude oil injected into the fluid driving destination layer of the injection well to flow to the production well for a unit distance, and the distance between the injection well and each production well is in inverse proportion to the weight of the position information of the production well, the crude oil injected into the fluid driving destination layer of the injection well can be ensured to simultaneously flow to each production well, even if a plurality of production wells simultaneously benefit, and the development efficiency of the oil deposit is effectively improved.

Description

Method and device for determining injection well position information
Technical Field
The application relates to the technical field of oil and gas development, in particular to a method and a device for determining position information of an injection well.
Background
In the middle and later stages of reservoir development using production wells, injection wells are typically placed near multiple production wells. Thereafter, a fluid is injected into the injection well. The fluid injected into the injection well may drive the crude oil in the zone of interest (also referred to as the reservoir or the production zone) of the reservoir toward each production well in the zone of interest to continue developing the reservoir. Prior to placing an injection well, the location of the injection well needs to be determined.
In the related art, coordinates of a plurality of (for example, 4) production wells may be determined, and then coordinates of an injection well to be set may be determined according to a gravity center algorithm, so that a position of the injection well to be set may be determined according to the coordinates, and after the injection well is set according to the position, a position of the injection well is a position of a gravity center surrounded by the plurality of production wells.
However, after the injection fluid in the injection well is determined by the gravity center algorithm, the flow rate of the crude oil in the fluid-driven target layer to each production well is different, so that the time for the crude oil in the fluid-driven target layer to flow to each production well is different, and the development efficiency of the oil reservoir is low.
Disclosure of Invention
The application provides a method and a device for determining position information of an injection well, which can solve the problem of low development efficiency of developing an oil reservoir by the injection well determined by adopting a gravity center algorithm in the related art. The technical scheme is as follows:
in one aspect, a method of determining injection well location information is provided, the method comprising:
obtaining location information for each of a plurality of production wells surrounding the injection well;
determining a weight for each of the production wells for location information, the weight characterizing a time required for crude oil in a fluid-driven destination injected into the injection well to flow a unit distance toward the production wells;
determining the location information of the injection well according to the location information of each production well and the weight of the location information of each production well, so that the distance between the injection well and each production well is inversely proportional to the weight of the location information of the production well.
Optionally, the determining the weight of the location information of each production well includes:
determining position information of a reference injection well based on the position information of each of the plurality of production wells, wherein the position information of the reference injection well is the position information of the gravity center of a polygon formed by the plurality of production wells;
obtaining first attribute information of the reference injection well, the first attribute information comprising: a radius of a wellbore of the reference injection well, a pressure of a fluid at a bottom of the reference injection well, an altitude of a highest point of an intersection region with the reference injection well in the destination layer, a density and a viscosity of a fluid injected into the reference injection well;
obtaining second attribute information of each of the production wells, the second attribute information including: permeability of a zone of interest between the production well and the reference injection well, flow pressure of the production well, and elevation of a highest point of an intersection region with the production well in the zone of interest;
for each of the production wells, determining a weight of the location information of the production well based on the second property information of the production well and the first property information of the reference injection well.
Optionally, determining a weight of the location information of each of the production wells based on the first property information of the reference injection well and the second property information of each of the production wells, comprises:
calculating a weight of the location information of each of the production wells based on the first attribute information of the reference injection well and the second attribute information of each of the production wells using a weight calculation formula, the weight calculation formula being:
Figure BDA0002190036990000021
wherein, WiWeight for location information of the ith production well, μ viscosity of fluid injected into the reference injection well, rwRadius of wellbore of said reference injection well, KiPermeability of the zone of interest between the ith production well and the reference injection well, PwIs the pressure of the fluid at the bottom of the reference injection well, PoiIs the flow pressure of the ith production well, ρ is the density of the fluid injected into the reference injection well, g is the acceleration of gravity, ZwIs the altitude, Z, of the highest point of the intersection region with the reference injection well in the destination layeroiIs the altitude of the highest point of the intersection area with the ith production well in the destination zone.
Optionally, determining location information of a reference injection well based on the location information of each of the plurality of production wells comprises:
determining the position information of a reference injection well by adopting a gravity center algorithm according to the position information of each production well, wherein the gravity center algorithm comprises the following steps:
Figure BDA0002190036990000031
wherein, XgIs the abscissa, Y, of said reference injection wellgIs the ordinate, X, of the reference injection welliIs the abscissa, Y, of the ith production welliThe ordinate of the ith production well.
Optionally, determining the location information of the injection well according to the location information of each production well and the weight of the location information of each production well comprises:
determining the position information of the injection well by adopting a weighted average algorithm according to the position information of each production well and the weight of the position information of each production well, wherein the weighted average algorithm is as follows:
Figure BDA0002190036990000032
wherein, XGIs the abscissa, Y, of the injection wellGIs the ordinate, X, of the injection welliIs the abscissa, Y, of the ith production welliIs the ordinate, W, of the ith production welliIs the ithWeight of location information of the production well.
In another aspect, an apparatus for determining injector well location information is provided, the apparatus comprising:
an acquisition module for acquiring location information for each of a plurality of production wells surrounding the injection well;
a first determination module for determining a weight for the location information for each of the production wells, the weight being indicative of a time required for crude oil in a fluid-driven destination injected into the injection well to flow a unit distance toward the production wells;
and the second determination module is used for determining the position information of the injection well according to the position information of each production well and the weight of the position information of each production well, so that the distance between the injection well and each production well is inversely proportional to the weight of the position information of the production well.
Optionally, the first determining module includes:
a first determination submodule configured to determine position information of a reference injection well based on position information of each of the plurality of production wells, the position information of the reference injection well being position information of a center of gravity of a polygon surrounded by the plurality of production wells;
a first obtaining sub-module, configured to obtain first attribute information of the reference injection well, where the first attribute information includes: a radius of a wellbore of the reference injection well, a pressure of a fluid at a bottom of the reference injection well, an altitude of a highest point of an intersection region with the reference injection well in the destination layer, a density and a viscosity of a fluid injected into the reference injection well;
a second obtaining sub-module, configured to obtain second attribute information of each production well, where the second attribute information includes: permeability of a zone of interest between the production well and the reference injection well, flow pressure of the production well, and elevation of a highest point of an intersection region with the production well in the zone of interest;
a second determination submodule for determining, for each of the production wells, a weight of the location information of the production well based on the second attribute information of the production well and the first attribute information of the reference injection well.
Optionally, the second determining submodule is configured to:
calculating a weight of the location information of each of the production wells based on the first attribute information of the reference injection well and the second attribute information of each of the production wells using a weight calculation formula, the weight calculation formula being:
Figure BDA0002190036990000041
wherein, WiWeight for location information of the ith production well, μ viscosity of fluid injected into the reference injection well, rwRadius of wellbore of said reference injection well, KiPermeability of the zone of interest between the ith production well and the reference injection well, PwIs the pressure of the fluid at the bottom of the reference injection well, PoiIs the flow pressure of the ith production well, ρ is the density of the fluid injected into the reference injection well, g is the acceleration of gravity, ZwIs the altitude, Z, of the highest point of the intersection region with the reference injection well in the destination layeroiIs the altitude of the highest point of the intersection area with the ith production well in the destination zone.
Optionally, the first determining sub-module is configured to:
determining the position information of a reference injection well by adopting a gravity center algorithm according to the position information of each production well, wherein the gravity center algorithm comprises the following steps:
Figure BDA0002190036990000051
wherein, XgIs the abscissa, Y, of said reference injection wellgIs that the ginseng isExamining the ordinate, X, of the injection welliIs the abscissa, Y, of the ith production welliThe ordinate of the ith production well.
Optionally, the second determining module is configured to:
determining the position information of the injection well by adopting a weighted average algorithm according to the position information of each production well and the weight of the position information of each production well, wherein the weighted average algorithm is as follows:
Figure BDA0002190036990000052
wherein, XGIs the abscissa, Y, of the injection wellGIs the ordinate, X, of the injection welliIs the abscissa, Y, of the ith production welliIs the ordinate, W, of the ith production welliIs the weight of the location information of the ith production well.
In yet another aspect, an apparatus for determining injector well location information is provided, the apparatus comprising: a processor, a memory, and a computer program stored on the memory and executable on the processor, the processor when executing the computer program implementing the method of determining injector well location information as described in the above aspect.
In yet another aspect, a computer-readable storage medium having instructions stored therein, which when run on a computer, cause the computer to perform a method of determining injector well location information as described in the above aspect.
The beneficial effect that technical scheme that this application provided brought includes at least:
the application provides a method and a device for determining injection well position information, wherein the method can determine the position information of an injection well according to the position information of each production well and the weight of the position information. Since the weight of the position information of each production well is used for representing the time required by the crude oil injected into the fluid driving destination layer of the injection well to flow to the production well for a unit distance, and the distance between the injection well and each production well is in inverse proportion to the weight of the position information of the production well, the crude oil injected into the fluid driving destination layer of the injection well can be ensured to simultaneously flow to each production well, even if a plurality of production wells simultaneously benefit, and the development efficiency of the oil deposit is effectively improved.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic illustration of a distribution of injection and production wells of the related art;
fig. 2 is a flow chart of a method for determining injection well location provided by an embodiment of the present invention;
fig. 3 is a flow chart of another method for determining injector well location information provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of a distribution of injection wells and production wells provided by an embodiment of the present invention;
FIG. 5 is a schematic plan flow diagram of an injection well and a production well provided by embodiments of the present invention;
FIG. 6 is a schematic diagram of another injection well and production well configuration provided by embodiments of the present invention;
fig. 7 is a schematic structural diagram of an apparatus for determining injector well location information according to an embodiment of the present invention;
FIG. 8 is a block diagram of a first determining module according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another device for determining injector well location information according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The oil reservoir is developed, and the oil reservoir is comprehensively analyzed according to the oil reservoir exploration and evaluation results, production tests and other data to determine the industrial value of the oil reservoir. And then, according to the market demand, a reasonable development scheme is made with the aim of improving the recovery ratio of the oil reservoir. And finally, setting a production well according to the development scheme, developing the oil reservoir, and in the development process, developing the oil reservoir by the production well according to the production capacity and the economic benefit planned in the development scheme.
In the initial stage of developing a reservoir, the formation pressure of a target layer (also called a reservoir layer or a production layer) of the reservoir is high, and crude oil in the target layer can flow to a production well in the target layer under the action of the formation pressure (namely, natural energy). The production well can convey crude oil near the production well in a target layer to the ground so as to realize the development of the oil reservoir. As the crude oil in the target zone is gradually reduced, the formation pressure of the target zone is gradually reduced, and the crude oil in the target zone cannot flow to the production well in the target zone. At this time, in order to continue to develop the oil reservoir, a mode of establishing an injection-production well pattern can be adopted, and the recovery ratio of the oil reservoir is improved. That is, injection wells may first be placed near a plurality of production wells of an oil field to form an injection-production well pattern. A fluid may then be injected into the injection well such that the fluid drives the crude oil in the destination to the production well in the destination. Wherein the formation pressure refers to the pressure acting on the material (such as crude oil, natural gas or water) in the rock pore space of the target layer, and is also called the formation pore pressure.
In the related art, the coordinates of the injection well can be determined by using a centroid algorithm, based on the coordinates of 4 adjacent production wells. That is, if the 4 adjacent production wells enclose a square, i.e., each production well is located at one vertex of the square, the injector well may be located at the center of the square. Fig. 1 is a schematic diagram of a distribution of injection wells and production wells in the related art. As can be seen from fig. 1, the plurality of injection wells may be evenly distributed in the area of the production wells, and the plurality of production wells and the plurality of injection wells may be distributed in a net, i.e. forming an injection and production well pattern. Referring to fig. 1, a general injection-production well pattern established in an oil field may be a five-point injection-production well pattern, i.e. 1 injection well is arranged at the center of gravity of every 4 production wells.
However, the property parameters of the target formation may be different between each production well and the injection well, and the production pressure difference may be different between each production well, resulting in different flow rates of crude oil in the fluid-driven target formation injected into the injection well in the related art to each production well, and further resulting in different times for the crude oil in the fluid-driven target formation to flow to each production well, resulting in low efficiency of development of the oil reservoir. Furthermore, the property parameters of the target zone between each production well and the injection well may be different, and the production pressure difference between each production well may be different, which may also cause that the fluid injected into the injection well in the related art may drive the crude oil in the target zone to move to only some of the production wells, for example, a dominant seepage channel may be formed between the injection well and a certain production well, the fluid injected into the injection well has a fast seepage speed in the dominant seepage channel, and is prone to a one-way channeling phenomenon, i.e., the fluid injected into the injection well flows to the production well through the dominant seepage channel, so that the fluid cannot drive the crude oil in the target zone to flow to other production wells, the oil displacement efficiency is low, and the development efficiency of the oil reservoir is low. The attribute parameters of the destination layer may include: reservoir permeability, reservoir thickness, etc. The layer thickness may refer to the distance between the top and bottom of the reservoir. The production pressure difference is the difference between the static pressure and the flow pressure of the target layer when the production well is producing, and represents the pressure consumed in the target layer when a certain amount of crude oil flows to the production well from other positions in the target layer.
The embodiment of the invention provides a method for determining position information of an injection well, which can be applied to a terminal and can solve the problem of low development efficiency of developing an oil reservoir by using the injection well determined by a gravity center algorithm in the related art. Referring to fig. 2, the method for determining injector well location information may include:
step 101, obtaining location information of each production well of a plurality of production wells.
Wherein a plurality of production wells may surround the injection well, the plurality of production wells may be referred to as benefit wells of the injection well. Optionally, the number of the plurality of production wells is greater than or equal to 3, for example, the number of the plurality of production wells may be 4.
Step 102, determining the weight of the position information of each production well.
The weight may be used to characterize the time required for crude oil in a fluid-driven formation of interest injected into the injection well to flow a unit distance toward the production well. That is, the weight may be used to characterize the time required for a unit distance of seepage of a fluid injected into the injection well during the process of seepage from the injection well in the formation of interest into the production well in the formation of interest. It should be noted that the target layer belongs to a porous medium, and the fluid flows in the pores of the target layer, i.e. seepage.
Alternatively, the fluid may be water or a polymer.
And 103, determining the position information of the injection well according to the position information of each production well and the weight of the position information of each production well, so that the distance between the injection well and each production well is in inverse proportion to the weight of the position information of the production well.
That is, the smaller the distance between the production well and the injection well, the more weight the location information of the production well is weighted. Conversely, the greater the distance between the production well and the injection well, the less weight the location information for the production well.
In summary, the embodiments of the present invention provide a method for determining injection well location information, which can determine the location information of an injection well according to the location information of each production well and the weight of the location information. Since the weight of the position information of each production well is used for representing the time required by the crude oil injected into the fluid driving destination layer of the injection well to flow to the production well for a unit distance, and the distance between the injection well and each production well is in inverse proportion to the weight of the position information of the production well, the crude oil injected into the fluid driving destination layer of the injection well can be ensured to simultaneously flow to each production well, even if a plurality of production wells simultaneously benefit, and the development efficiency of the oil deposit is effectively improved.
Fig. 3 is a flow chart of another method for determining injector well location information according to an embodiment of the present invention. The method may be applied to a terminal, and referring to fig. 3, the method for determining injector well location information may include:
step 201, obtaining position information of each production well in a plurality of production wells.
Wherein the plurality of production wells may surround the injection well, any two production wells of the plurality of production wells may be adjacent, and the plurality of production wells may be referred to as benefit wells of the injection well. The location information for each production well may refer to location information for the center of the intersection region of the production well with the roof of the destination layer of the reservoir.
Optionally, the number of the plurality of production wells is greater than or equal to 3. For example, referring to fig. 4, the number of the plurality of production wells may be 4. Accordingly, the injection-production well pattern established in the field based on the location information of every 4 production wells may be referred to as a five-point injection-production well pattern.
In an embodiment of the present invention, the terminal may acquire Global Positioning System (GPS) coordinates of an intersection center of each of the plurality of production wells and the layer top of the destination layer, the GPS coordinates including longitude and latitude coordinates of the intersection center. The terminal may then determine the coordinates of the production well in the target coordinate system based on the longitude and latitude coordinates and determine the coordinates of the production well as location information of the production well. The target coordinate system may also be referred to as a geodetic datum plane, and accordingly, the coordinates of the production well in the target coordinate system may also be referred to as geodetic coordinates.
Alternatively, the target coordinate system may be a geodetic datum of the region of the production well. For example, if the production well is located in china, the target coordinate system may be the beijing 54 coordinate system, or the sienna 80 coordinate system.
Step 202, determining location information of a reference injection well based on the location information of each of the plurality of production wells.
The position information of the reference injection well is the position information of the gravity center of a polygon enclosed by a plurality of production wells, and both the reference injection well and the plurality of production wells can penetrate through the target layer of the oil deposit.
In an embodiment of the present invention, the terminal may determine the location information of the reference injection well by using a centroid algorithm according to the location information of each production well of the plurality of production wells, where the centroid algorithm is:
Figure BDA0002190036990000091
x in formula (1)gIs the abscissa, Y, of the reference injection wellgIs the ordinate, X, of the reference injection welliIs the abscissa, Y, of the ith production welliThe ordinate of the ith production well.
Optionally, the coordinates of each production well refer to the coordinates of the center of its intersection area with the layer top of the target layer, and the coordinates of the reference injection well refer to the coordinates of the center of its intersection area with the layer top of the target layer. These coordinates may each be coordinates in the target coordinate system.
For example, assuming that the number of the plurality of production wells is 4, i is 4, and the position information of the first production well acquired by the terminal is a coordinate (X)1，Y1) (20531549.3, 4284062.7); the location information of the second production well is a coordinate (X)2，Y2) (20531427.3, 4283787.7); the position information of the third production well is a coordinate (X)3，Y3) (20531877.4, 4283660.3); the location information of the fourth production well is the coordinate (X)4，Y4) = (20531877.4, 4283971.4). The location information of the reference injection well determined by the terminal based on the above formula (2) may be coordinates (X)g，Yg) = (16469631.075, 4283870.525). Wherein:
Xg＝(20531549.3+20531427.3+4283660.3+20531877.4)/4＝16469631.075，
Yg＝(4284062.7+4283787.7+4283660.3+4283971.4)/4＝4283870.525。
and step 203, acquiring first attribute information of the reference injection well.
The first attribute information includes: the radius of the wellbore of the reference injection well, the pressure of the fluid at the bottom of the reference injection well (also referred to as the injection pressure of the injection well), the altitude of the highest point of the zone of intersection with the reference injection well in the destination layer (also referred to as the elevation of the formation of the reference injection well), the density and viscosity of the fluid injected into the reference injection well.
In the practice of the invention, the radius of the wellbore of the reference injection well, the density and viscosity of the fluid injected into the reference injection well may be obtained from production data of injection wells that have been currently in service. The injection pressure of the reference injection well may be determined according to a development plan of the reference injection well. The formation elevation of the reference injector may be determined based on the location information of the reference injector and the formation profile of the reservoir.
Alternatively, the operator may determine the radius of the wellbore of the reference injection well, the density and viscosity of the fluid injected into the reference injection well, and the injection pressure of the reference injection well by querying the production data and development data, among other data. And the staff can inquire the structure distribution diagram of the oil deposit according to the position information of the reference injection well and determine the structure elevation of the reference injection well. Then, the staff may input the determined parameter, that is, the first attribute information of the reference injection well, into the terminal, so that the terminal can acquire the first attribute information of the reference injection well.
And step 204, acquiring second attribute information of each production well.
The second attribute information may include: permeability of a zone of interest between the production well and the reference injection well, flow pressure of the production well, and elevation of a highest point of an intersection area with the production well in the zone of interest (also referred to as a formation elevation of the production well).
It should be noted that, since the target layer is formed over a long time, the property parameters (such as thickness and permeability) of the target layer are changed continuously during the formation of the target layer. Thus, the layer thickness and permeability at different locations in the target layer are not the same. In order to improve the accuracy of the obtained permeability of the target formation between the production well and the reference injection well, the average of the permeability of the target formation of the production well and the permeability of the target formation of the reference injection well in the target formation may be determined as the permeability of the target formation between the production well and the reference injection well. Wherein, the permeability of the target layer of the production well may refer to the permeability of the target layer at the position of the production well, and the permeability of the target layer of the reference injection well may refer to the permeability of the target layer at the position of the reference injection well.
Alternatively, the average may be an arithmetic average, a geometric average or a root mean square average, and may be an arithmetic average, for example.
Illustratively, referring to FIG. 4, the number of the plurality of production wells is 4, each being the first production well A1Second production well A2Third production well A3And a fourth production well A4. Assuming that the permeability of the reference injection well obtained by the terminal is kw＝620*10-3Micron square (mum)2) First production well A1Has a permeability of k1＝666*10-3μm2Then the first production well A1Permeability K of the target zone between the injection well and the reference injection well1＝643*10-3μm2. Assume terminal acquired second production well A2Has a permeability of k2＝712*10-3μm2Then the second production well A2Permeability K of the target zone with the reference injection well2＝686*10-3μm2. Assume third production well A obtained by terminal3Has a permeability of k3＝892*10-3μm2Then the third production well A3Target stratum between reference injection wellPermeability K of3＝756*10-3μm2. Assume terminal acquired fourth production well A4Has a permeability of k4＝615*10-3μm2Then the fourth production well A4Permeability K of the target zone with the reference injection well4＝617.5*10-3μm2。
In embodiments of the present invention, the permeability of the target zone of the production well may be determined from drilling data, logging data, and testing data of the production well. The permeability of the target formation of the reference injection well may be determined from an average of the permeabilities of the target formations of the plurality of production wells, e.g., may be equal to an arithmetic average of the permeabilities of the target formations of the plurality of production wells. Alternatively, the permeability of the destination layer of the reference injector may be obtained in a Digital Terrain Model (DTM) by a gaussian-gram interpolation algorithm. The flow pressure of the production well may be determined from production data of the production well. The elevation of the highest point of the intersection region with the production well in the destination layer can be determined from the location information of the production well and the formation profile of the reservoir.
Alternatively, the personnel may determine the permeability of the formation of interest between the producing well and the reference injection well by querying the drilling data, logging data, and testing data. And the staff can determine the flow pressure of the production well according to the production data of the production well, and can determine the structural elevation of the production well according to the structural distribution map of the oil deposit and the position information of the production well. Then, the operator may input the acquired parameter, that is, the second attribute information of the production well, into the terminal, so that the terminal may acquire the second attribute information of the production well.
For each production well, determining a weight of the location information for the production well based on the second property information for the production well and the first property information for the reference injection well, step 205.
Wherein the weight is used to characterize the time required to drive crude oil in the zone of interest towards the fluid injected into the injection well towards the production well a unit distance. That is, the weight may be used to characterize the time required for a unit distance of seepage of a fluid injected into the injection well during the process of seepage from the injection well in the formation of interest into the production well in the formation of interest. It should be noted that the target layer belongs to a porous medium, and the fluid flows in the pores of the target layer, i.e. percolation.
Alternatively, the fluid may be water or a polymer.
In an embodiment of the present invention, for each production well of the plurality of production wells, a radial darcy seepage formula is satisfied during seepage of fluid injected into the reference injection well from the reference injection well in the destination zone to the production well in the destination zone:
Figure BDA0002190036990000121
in equation (2), K is the permeability of the target formation between the production well and the reference injection well, H is the thickness of the target formation between the production well and the reference injection well, PwFor reference to the pressure of the fluid at the bottom of the injection well, PoRho is the density of the fluid injected into the reference injection well, mu is the viscosity of the fluid injected into the reference injection well, g is the acceleration of gravity, Z is the flow pressure of the production welloAltitude, Z, being the highest point of the zone of intersection with the production well in the zone of interestwIs the altitude of the highest point of the intersection region with the reference injection well in the destination layer, roFor reference to the distance between the injection well and the production well, rwThe radius of the wellbore for the reference injection well.
In addition, referring to FIG. 5, roThe distance between the wellbore of the reference injection well located in the zone of interest and the wellbore of the production well located in the zone of interest. Due to the distance r between the injection well and the production welloRadius r of a wellbore not including the reference injection wellw. And the fluid injected into the reference injection well flows out from the center of the reference injection well, so that the fluid flows out from the reference injection wellThe unit distance of seepage to the production well is rw+1。
The fluid may flow through a unit distance that satisfies the following equation (3) during seepage from a reference injection well in the formation of interest to a production well in the formation of interest:
Figure BDA0002190036990000131
q in formula (3)1Is the flow rate of the fluid per unit distance.
Since the rate of fluid seepage is the ratio of the flow rate per unit distance to the cross-sectional area of the formation of interest through which the fluid flows, see fig. 5, the thickness of the formation of interest between the producing well and a reference injection well having a wellbore radius rwThen the cross-sectional area of the destination layer through which the fluid flows is 2 x pi x rwX H, so that the fluid has a percolation velocity V that satisfies:
Figure BDA0002190036990000132
that is, the flow rate of the fluid per unit time per unit cross-sectional area is
Figure BDA0002190036990000133
Since the faster the seepage velocity per unit distance of the fluid injected into the injection well, the faster the flow rate of the crude oil in the fluid-driven formation of interest to the production well, the shorter the time for the corresponding crude oil to flow to the production well. Conversely, the slower the seepage velocity per unit distance of the seepage of the fluid injected into the injection well, the slower the flow rate of the crude oil in the fluid-driven destination zone towards the production well, and correspondingly the longer the time for the crude oil to flow to the production well. Thus, the distance between the injection well and each production well may be adjusted such that the fluid injected into the injection well is capable of driving crude oil in the zone of interest to flow simultaneously to each of the plurality of production wells. For example, assuming that the flow rate of the crude oil in the fluid driving destination to the first production well is less than the flow rate of the crude oil in the fluid driving destination to the second production well, it is necessary to ensure that the injection well is a greater distance from the first production well than the second production well so that the fluid can drive the crude oil in the destination to flow to both the first production well and the second production well.
As can be seen from the above analysis, in the embodiment of the present invention, the corresponding weight may be determined for the location information of each production well, and the determined weight is inversely proportional to the seepage velocity of the fluid at the production well, i.e., a smaller weight is determined for the production well with a greater seepage velocity, and a larger weight is determined for the production well with a smaller seepage velocity, so as to adjust the distance between the injection well and each production well.
Since the seepage velocity is equal to the quotient of unit distance and time, i.e. the seepage velocity is inversely proportional to time, for each of a plurality of production wells, the time T required for the unit distance of the fluid seepage destination zone can be used as a weight for the location information of the production well. Wherein the required time T per unit distance of fluid seepage satisfies the following equation (5).
T1/V formula (5)
The weight W of the position information of each production well can be determined according to the above formulas (3), (4) and (5)iThe weight WiThe following formula (6) may be satisfied, and the formula (6) may be referred to as a weight calculation formula.
Figure BDA0002190036990000141
In the formula (6), WiIs the weight of the location information of the ith production well.
As can be seen from the formula (6), when determining the weight of the location information of the production well, the factors such as the production pressure difference of the production well, the property of the target zone, the structural characteristics, and the property of the injected fluid are taken into consideration, so that the accuracy of the determined seepage time is ensured, the accuracy of the determined location information of the production well is ensured, the fluid injected into the injection well can be effectively ensured to flow to each production well in the target zone at the same time, and thus, a plurality of production wells can benefit at the same time.
For example, if the reference injection well obtained by the determination device has a wellbore radius rw0.06 meters (m), reference pressure P of fluid at bottom of injection wellw12 megapascals (MPa), the elevation (i.e., build elevation) Z of the highest point of the intersection region with the reference injection well in the destination layerw-1864m, the density ρ of the fluid injected into the reference injection well being 1.0 × 103Kilogram per cubic meter (Kg/m)3) Viscosity μ ═ 1.0 × 106Pascal-seconds (Pa · s). The first production well A obtained by the determination device1Pressure of flow Po13.2MPa, first production well A1Structural elevation Zo1First production well a determined ═ 1850m1Permeability K of the target zone between the injection well and the reference injection well1＝643*10-3μm2The determination means may determine the first production well a based on the above equation (6)1First weight W of1＝57.74。
If the second production well A is obtained by the determination device2Pressure of flow Po12.8MPa, second production well A2Structural elevation Zo2Second production well a defined ═ 1852m2Permeability K of the target zone between the injection well and the reference injection well2＝686*10-3μm2The determination means may determine the second production well a based on the above equation (6)2Second weight W of253.17. If the third production well A obtained by the determination device3Pressure of flow Po33.9MPa, third production well A3Structural elevation Zo3-1865m, determined third production well a3Permeability K of the target zone between the injection well and the reference injection well3＝756*10-3μm2The determination means may determine the third production well a based on the above equation (6)3Third weight W of352.46. If the fourth one is obtained by the determining meansProduction well A4Pressure of flow Po41.4MPa, fourth production well A4Structural elevation Zo4-1875m, determined fourth production well a4Permeability K of the target zone between the injection well and the reference injection well4＝615*10-3μm2The determination means may determine the fourth production well a based on the above equation (6)4Fourth weight W of4＝48.64。
And step 206, determining the position information of the injection well according to the position information of each production well and the weight of the position information of each production well, so that the distance between the injection well and each production well is in inverse proportion to the weight of the position information of the production well.
That is, the smaller the distance between the production well and the injection well, the more weight the location information of the production well is weighted. Conversely, the greater the distance between the production well and the injection well, the less weight the location information for the production well.
In an embodiment of the present invention, the terminal may determine the location information of the injection well by using a weighted average algorithm according to the location information of each production well and the weight of the location information of each production well, where the weighted average algorithm is:
Figure BDA0002190036990000151
wherein, XGIs the abscissa of the injection well, YGThe ordinate of the injection well.
For example, referring to fig. 4 and 6, the number of the plurality of production wells is 4, and the position information of the first production well a1 acquired by the determination device is assumed as a coordinate (X)1，Y1) (20531549.3, 4284062.7), first weight W for first production well a1157.74; location information coordinates (X) of the second production well A22，Y2) (20531427.3, 4283787.7), second weight, W, of second production well, a2253.17; the positional information of the third production well A3 is coordinates (X)3，Y3) (20531877.4, 4283660.3), third weight W for third production well A3352.46; the positional information of the fourth production well A4 is coordinates (X)4，Y4) (20531877.4, 4283971.4), fourth weight W for fourth production well a4448.64. The terminal may determine that the location information of the injection well may be coordinates (X) based on the above equation (7)G，YG) = (20532675.2, 4283873.2). Wherein:
XG＝(20531549.3*3.08*1010+20531427.3*2.77*1010+20531877.4*2.81*1010+20531877.4*2.62*1010)/(3.08*1010+2.77*1010+2.81*1010+2.62*1010)＝20532675.2；
YG＝(4284062.7*3.08*1010+4283787.7*2.77*1010+4283660.3*2.81*10104283971.4*2.62*1010)/(3.08*1010+2.77*1010+2.81*1010+2.62*1010)＝4283873.2。
as can be seen from fig. 6, the injection well W determined by the method for determining injection well location information according to the embodiment of the present inventionGIs located in the reference injection well WgNorthwest direction of the reference injection well WgOffset to the northwest by about 36 m.
In embodiments of the invention, the injection well may be injected with different or the same fluids at different development stages of the reservoir. For example, in a secondary development phase of the reservoir, i.e., before the formation pressure is less than the saturation pressure and the gas-oil ratio in the target zone rises to a maximum value, water may be injected into the injection well so that the formation pressure is maintained above the saturation pressure, thereby allowing crude oil in the target zone to flow down to the production wells in the target zone under the drive of water, and therefore the secondary development phase may also be referred to as a waterflood development phase. In the third development stage of the oil reservoir, that is, when the geological reserves of the oil reservoir are produced to a high degree, water cannot drive the crude oil in the target zone to flow to the production well in the target zone, at this time, a polymer (also called polymer injection) can be injected into the injection well, so that the crude oil in the target zone flows to the production well in the target zone under the driving of the polymer, and therefore, the third development stage can also be called polymer injection development stage. Therefore, secondary development and tertiary development of the oil reservoir can be realized, and the recovery ratio of the oil reservoir is improved. Wherein the saturation pressure is the pressure at which the natural gas in the target layer begins to separate from the crude oil. The gas-to-oil ratio may refer to the amount of natural gas dissolved per unit volume or weight of crude oil in the zone of interest. The geological reserve extraction degree of the oil reservoir refers to the ratio of the accumulated oil extraction amount in a certain period of time to the geological reserve.
Optionally, the order of the steps of the determination method for the injection well location information provided by the embodiment of the present invention may be appropriately adjusted, and the steps may also be increased or decreased according to the situation. For example, step 203 and step 204 may be performed synchronously. Any method that can be easily conceived by those skilled in the art within the technical scope disclosed in the present application is also covered by the scope of the invention, and thus, the detailed description thereof is omitted.
In summary, the embodiments of the present invention provide a method for determining injection well location information, which can determine the location information of an injection well according to the location information of each production well and the weight of the location information. Because the weight of the position information of each production well is used for representing the time required by the crude oil injected into the injection well in the fluid driving target layer and flowing to the production well for a unit distance, and the distance between the injection well and each production well is in inverse proportion to the weight of the position information of the production well, the crude oil injected into the fluid driving target layer in the injection well can be ensured to simultaneously flow to each production well, even if a plurality of production wells can simultaneously benefit, the phenomenon of one-way fluid channeling of the fluid is avoided, the oil displacement efficiency of the fluid is improved, the development efficiency of the oil reservoir is effectively improved, the crude oil in the target layer can be effectively driven to the production well, and the recovery ratio of the oil reservoir is effectively improved.
Fig. 7 is a schematic structural diagram of an apparatus for determining injector well location information according to an embodiment of the present invention, which may be configured in a terminal. Referring to fig. 7, the apparatus may include:
an obtaining module 301, configured to obtain location information of each of a plurality of production wells.
Wherein the plurality of production wells surround the injection well.
A first determination module 302 for determining a weight of the location information for each production well.
The weight is used to characterize the time required for crude oil in a fluid-driven zone of interest injected into the injection well to flow a unit distance toward the production well.
A second determining module 303, configured to determine the location information of the injection well according to the location information of each production well and the weight of the location information of each production well, so that the distance between the injection well and each production well is inversely proportional to the weight of the location information of the production well.
In summary, the present invention provides an apparatus for determining injection well location information, which can determine the location information of an injection well according to the location information of each production well and the weight of the location information. Since the weight of the position information of each production well is used for representing the time required by the crude oil injected into the fluid driving destination layer of the injection well to flow to the production well for a unit distance, and the distance between the injection well and each production well is in inverse proportion to the weight of the position information of the production well, the crude oil injected into the fluid driving destination layer of the injection well can be ensured to simultaneously flow to each production well, even if a plurality of production wells simultaneously benefit, and the development efficiency of the oil deposit is effectively improved.
Fig. 8 is a schematic structural diagram of a first determining module provided in an embodiment of the present invention. Referring to fig. 8, the first determining module 302 may include:
a first determining submodule 3021 configured to determine, based on the position information of each of the plurality of production wells, position information of a reference injection well, which is position information of a center of gravity of a polygon surrounded by the plurality of production wells.
A first obtaining submodule 3022 configured to obtain first attribute information of the reference injector.
The first attribute information includes: the radius of the wellbore of the reference injection well, the pressure of the fluid at the bottom of the reference injection well, the altitude of the highest point of the intersection region with the reference injection well in the destination layer, the density and viscosity of the fluid injected into the reference injection well.
A second obtaining submodule 3023 configured to obtain second attribute information of each production well.
The second attribute information includes: permeability of a zone of interest between the production well and the reference injection well, flow pressure of the production well, and an altitude of a highest point of an intersection region with the production well in the zone of interest.
A second determining submodule 3024 configured to determine, for each production well, a weight of the location information of the production well based on the second property information of the production well and the first property information of the reference injection well.
Optionally, the second determining submodule 3024 may be configured to:
calculating the weight of the position information of each production well by adopting a weight calculation formula based on the first attribute information of the reference injection well and the second attribute information of each production well, wherein the weight calculation formula is as follows:
Figure BDA0002190036990000181
wherein, WiWeight of location information for the ith production well, rwIs the radius of the wellbore of the reference injection well, mu is the viscosity of the fluid injected into the reference injection well, KiPermeability of the zone of interest, P, between the ith production well and the reference injection wellwIs the pressure of the fluid at the bottom of the reference injection well, PoiIs the flow pressure of the ith production well, ρ is the density of the fluid injected into the reference injection well, g is the acceleration of gravity, ZwAltitude, Z, being the highest point of the intersection area with the reference injection well in the destination layeroiIs the altitude of the highest point of the intersection region with the ith production well in the destination zone.
Optionally, the first determining submodule 3021 may be configured to:
and determining the position information of the reference injection well by adopting a gravity center algorithm according to the position information of each production well, wherein the gravity center algorithm comprises the following steps:
Figure BDA0002190036990000182
wherein, XgIs the abscissa, Y, of the reference injection wellgIs the ordinate, X, of the reference injection welliIs the abscissa, Y, of the ith production welliThe ordinate of the ith production well.
Optionally, the second determining module 303 may be configured to:
determining the position information of the injection well by adopting a weighted average algorithm according to the position information of each production well and the weight of the position information of each production well, wherein the weighted average algorithm is as follows:
Figure BDA0002190036990000191
wherein, XGIs the abscissa of the injection well, YGIs the ordinate, X, of the injection welliIs the abscissa, Y, of the ith production welliIs the ordinate, W, of the ith production welliIs the weight of the location information of the ith production well.
In summary, the present invention provides an apparatus for determining injection well location information, which can determine the location information of an injection well according to the location information of each production well and the weight of the location information. Because the weight of the position information of each production well is used for representing the time required by the crude oil injected into the injection well in the fluid driving target layer and flowing to the production well for a unit distance, and the distance between the injection well and each production well is in inverse proportion to the weight of the position information of the production well, the crude oil injected into the fluid driving target layer in the injection well can be ensured to simultaneously flow to each production well, even if a plurality of production wells can simultaneously benefit, the phenomenon of one-way fluid channeling of the fluid is avoided, the oil displacement efficiency of the fluid is improved, the development efficiency of the oil reservoir is effectively improved, the crude oil in the target layer can be effectively driven to the production well, and the recovery ratio of the oil reservoir is effectively improved.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the apparatus, the modules and the sub-modules described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Fig. 9 is a schematic structural diagram of another device for determining injector well location information according to an embodiment of the present invention. Referring to fig. 9, the apparatus 40 may include: a processor 401, a memory 402 and a computer program stored on the memory 402 and operable on the processor 401, the processor 401 when executing the computer program may implement the method of determining injector well location information as provided in the above method embodiments.
Embodiments of the present invention also provide a computer-readable storage medium having instructions stored therein, which when run on a computer, cause the computer to perform a method of determining injector well location information as provided in the above-described method embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only exemplary of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like that are made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. A method of determining injection well location information, the method comprising:
obtaining location information for each of a plurality of production wells surrounding the injection well;
determining a weight for each of the production wells for location information, the weight characterizing a time required for crude oil in a fluid-driven destination injected into the injection well to flow a unit distance toward the production wells;
determining the location information of the injection well according to the location information of each production well and the weight of the location information of each production well, so that the distance between the injection well and each production well is inversely proportional to the weight of the location information of the production well.
2. The method of claim 1, wherein determining the weight of the location information for each of the production wells comprises:
determining position information of a reference injection well based on the position information of each of the plurality of production wells, wherein the position information of the reference injection well is the position information of the gravity center of a polygon formed by the plurality of production wells;
obtaining first attribute information of the reference injection well, the first attribute information comprising: a radius of a wellbore of the reference injection well, a pressure of a fluid at a bottom of the reference injection well, an altitude of a highest point of an intersection region with the reference injection well in the destination layer, a density and a viscosity of a fluid injected into the reference injection well;
obtaining second attribute information of each of the production wells, the second attribute information including: permeability of a zone of interest between the production well and the reference injection well, flow pressure of the production well, and elevation of a highest point of an intersection region with the production well in the zone of interest;
for each of the production wells, determining a weight of the location information of the production well based on the second property information of the production well and the first property information of the reference injection well.
3. The method of claim 2, wherein determining a weight for the location information for each of the production wells based on the first property information for the reference injection well and the second property information for each of the production wells comprises:
calculating a weight of the location information of each of the production wells based on the first attribute information of the reference injection well and the second attribute information of each of the production wells using a weight calculation formula, the weight calculation formula being:
Figure FDA0002190036980000021
wherein, WiWeight for location information of the ith production well, μ viscosity of fluid injected into the reference injection well, rwRadius of wellbore of said reference injection well, KiPermeability of the zone of interest between the ith production well and the reference injection well, PwIs the pressure of the fluid at the bottom of the reference injection well, PoiIs the flow pressure of the ith production well, ρ is the density of the fluid injected into the reference injection well, g is the acceleration of gravity, ZwIs the altitude, Z, of the highest point of the intersection region with the reference injection well in the destination layeroiIs the altitude of the highest point of the intersection area with the ith production well in the destination zone.
4. The method of claim 2, wherein determining location information for a reference injection well based on the location information for each of the plurality of production wells comprises:
determining the position information of a reference injection well by adopting a gravity center algorithm according to the position information of each production well, wherein the gravity center algorithm comprises the following steps:
Figure FDA0002190036980000022
wherein, XgIs the abscissa, Y, of said reference injection wellgIs the ordinate, X, of the reference injection welliIs the abscissa, Y, of the ith production welliThe ordinate of the ith production well.
5. The method of any of claims 1 to 4, wherein determining the location information for the injection well based on the location information for each of the production wells and the weight of the location information for each of the production wells comprises:
determining the position information of the injection well by adopting a weighted average algorithm according to the position information of each production well and the weight of the position information of each production well, wherein the weighted average algorithm is as follows:
Figure FDA0002190036980000031
wherein, XGIs the abscissa, Y, of the injection wellGIs the ordinate, X, of the injection welliIs the abscissa, Y, of the ith production welliIs the ordinate, W, of the ith production welliIs the weight of the location information of the ith production well.
6. An apparatus for determining injector well location information, the apparatus comprising:
an acquisition module for acquiring location information for each of a plurality of production wells surrounding the injection well;
a first determination module for determining a weight for the location information for each of the production wells, the weight being indicative of a time required for crude oil in a fluid-driven destination injected into the injection well to flow a unit distance toward the production wells;
and the second determination module is used for determining the position information of the injection well according to the position information of each production well and the weight of the position information of each production well, so that the distance between the injection well and each production well is inversely proportional to the weight of the position information of the production well.
7. The apparatus of claim 6, wherein the first determining module comprises:
a first determination submodule configured to determine position information of a reference injection well based on position information of each of the plurality of production wells, the position information of the reference injection well being position information of a center of gravity of a polygon surrounded by the plurality of production wells;
a first obtaining sub-module, configured to obtain first attribute information of the reference injection well, where the first attribute information includes: a radius of a wellbore of the reference injection well, a pressure of a fluid at a bottom of the reference injection well, an altitude of a highest point of an intersection region with the reference injection well in the destination layer, a density and a viscosity of a fluid injected into the reference injection well;
a second obtaining sub-module, configured to obtain second attribute information of each production well, where the second attribute information includes: permeability of a zone of interest between the production well and the reference injection well, flow pressure of the production well, and elevation of a highest point of an intersection region with the production well in the zone of interest;
a second determination submodule for determining, for each of the production wells, a weight of the location information of the production well based on the second attribute information of the production well and the first attribute information of the reference injection well.
8. The apparatus of claim 7, wherein the second determination submodule is configured to:
calculating a weight of the location information of each of the production wells based on the first attribute information of the reference injection well and the second attribute information of each of the production wells using a weight calculation formula, the weight calculation formula being:
Figure FDA0002190036980000041
wherein, WiWeight for location information of the ith production well, μ viscosity of fluid injected into the reference injection well, rwRadius of wellbore of said reference injection well, KiPermeability of the zone of interest between the ith production well and the reference injection well, PwIs the pressure of the fluid at the bottom of the reference injection well, PoiIs the flow pressure of the ith production well, ρ is the density of the fluid injected into the reference injection well, g is the acceleration of gravity, ZwIs the altitude, Z, of the highest point of the intersection region with the reference injection well in the destination layeroiIs the altitude of the highest point of the intersection area with the ith production well in the destination zone.
9. The apparatus of claim 7, wherein the first determination submodule is configured to:
determining the position information of a reference injection well by adopting a gravity center algorithm according to the position information of each production well, wherein the gravity center algorithm comprises the following steps:
Figure FDA0002190036980000042
wherein, XgIs the abscissa, Y, of said reference injection wellgIs the ordinate, X, of the reference injection welliIs the abscissa, Y, of the ith production welliThe ordinate of the ith production well.
10. The apparatus of any of claims 6 to 9, wherein the second determining module is configured to:
determining the position information of the injection well by adopting a weighted average algorithm according to the position information of each production well and the weight of the position information of each production well, wherein the weighted average algorithm is as follows:
Figure FDA0002190036980000051
wherein, XGIs the abscissa, Y, of the injection wellGIs the ordinate, X, of the injection welliIs the abscissa, Y, of the ith production welliIs the ordinate, W, of the ith production welliIs the weight of the location information of the ith production well.
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