CN110924941B - Method and device for determining radius of water cone of side water reservoir - Google Patents
Method and device for determining radius of water cone of side water reservoir Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 297
- 238000000034 method Methods 0.000 title claims abstract description 71
- 238000004519 manufacturing process Methods 0.000 claims abstract description 331
- 238000005381 potential energy Methods 0.000 claims abstract description 135
- 230000015572 biosynthetic process Effects 0.000 claims description 50
- 239000012530 fluid Substances 0.000 claims description 50
- 239000003921 oil Substances 0.000 claims description 47
- 238000010276 construction Methods 0.000 claims description 30
- 238000011084 recovery Methods 0.000 claims description 28
- 238000003860 storage Methods 0.000 claims description 19
- 239000010779 crude oil Substances 0.000 claims description 13
- 230000003068 static effect Effects 0.000 claims description 8
- 230000001133 acceleration Effects 0.000 claims description 7
- 230000001186 cumulative effect Effects 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 5
- 230000009545 invasion Effects 0.000 abstract description 17
- 238000009826 distribution Methods 0.000 description 9
- XQCFHQBGMWUEMY-ZPUQHVIOSA-N Nitrovin Chemical compound C=1C=C([N+]([O-])=O)OC=1\C=C\C(=NNC(=N)N)\C=C\C1=CC=C([N+]([O-])=O)O1 XQCFHQBGMWUEMY-ZPUQHVIOSA-N 0.000 description 6
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- 230000002706 hydrostatic effect Effects 0.000 description 2
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- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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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
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Abstract
The invention discloses a method and a device for determining the radius of a water cone of an edge water reservoir, and belongs to the technical field of oil and gas development. The method comprises the following steps: and determining the ratio of the constructed low-direction water cone radius to the constructed high-direction water cone radius of the production well according to the constructed low-direction potential energy and the constructed high-direction potential energy. And then, determining the radius of the high-direction water cone of the structure and the radius of the low-direction water cone of the structure by adopting a volume method according to the obtained accumulated oil production of the production well in the production zone and the ratio. Compared with the method that the edge water reservoir water cone radius cannot be determined by adopting the bottom water reservoir water invasion model in the related art, the edge water reservoir water cone radius can be accurately obtained by the method provided by the invention.
Description
Technical Field
The invention relates to the technical field of oil and gas development, in particular to a method and a device for determining the radius of a water cone of an edge water reservoir.
Background
The boundary water reservoir generally develops in a clastic rock production layer, in the production process of a production well of the boundary water reservoir, boundary water can gradually advance to a production well section from the direction of the structure height of the production well and the direction of the structure low of the production well and gradually start to invade upwards, and finally forms a water cone, and the water cone surface of the water cone can block crude oil around a perforation well section of the production well, so that the crude oil is difficult to continuously flow into a shaft and is blocked in a stratum and cannot be produced, and the recovery ratio of the production well is reduced. Currently, the range size of the water cone is generally analyzed, so that the remaining oil distribution potential area in the production zone can be identified, and the recovery ratio of the production well is further improved.
In the related technology, a bottom water reservoir water invasion model is generally adopted to analyze the water invasion rule of an edge water reservoir, and the range of a water cone formed by edge water invasion in the edge water reservoir is described according to the water invasion rule. In the bottom water reservoir, however, the bottom water uniformly invades from the bottom of the production layer to the periphery of the well section of the production well in an equal quantity, finally, the whole well section is flooded by water, and water cones which are equidistant from the perforation well section are formed around the production well section. The orthographic projection of the water cone on the plane of the bottom of the production stratum is circular, and the circle and the orthographic projection of the production well on the plane are concentric. In the edge water reservoir, the edge water invasion is influenced by the structural characteristics, the fluid around the well cylinder is influenced by the production pressure difference in the production process of the oil well, the water cone bottom surface formed by the edge water invasion can be determined by comprehensively considering the factors, and the water cone radiuses in the low-structure direction and the high-structure direction of the production well are not equal.
Therefore, when the bottom water reservoir water invasion model guides the development of the edge water reservoir, the water invasion characteristics of the bottom water reservoir are only described qualitatively, so that the development rule of the edge water reservoir is analyzed, and factors such as the structure, the production well production pressure difference and the like are considered to be deficient in model precision, and larger deviation exists. And no method for quantitatively calculating the radius of the water cone exists in the related technology, so that the water cone range is difficult to quantitatively determine, and further, the residual oil distribution potential area is difficult to quantitatively identify.
Disclosure of Invention
The embodiment of the invention provides a method and a device for determining the radius of an edge water reservoir water cone, which can solve the problem that the radius of the edge water reservoir water cone is difficult to determine quantitatively in the related technology. The technical scheme is as follows:
in one aspect, a method for determining a radius of a water cone of an edge water reservoir is provided, and the method comprises the following steps:
respectively determining the construction high-direction potential energy and the construction low-direction potential energy of the production well according to the production differential pressure potential energy of a production layer of the production well and the fluid potential energy of the production layer;
acquiring the accumulated oil production of the production well in the production layer;
and taking the ratio of the constructed low-direction potential energy to the constructed high-direction potential energy as the ratio of the constructed low-direction water cone radius to the constructed high-direction water cone radius of the production well, and determining the constructed high-direction water cone radius and the constructed low-direction water cone radius by adopting a volumetric method according to the ratio and the accumulated oil production.
Optionally, determining the radius of the water cone in the high direction of the structure and the radius of the water cone in the low direction of the structure by using a volume method according to the ratio and the accumulated oil production includes:
obtaining the layer thickness h, the single storage coefficient D and the calibrated recovery ratio E of a production layer of the production well;
determining the radius R of the water cone in the high direction of the structure according to the ratio K, the accumulated oil production T, the layer thickness h, the single storage coefficient D and the calibrated recovery ratio E 1 And the low directional water cone radius R of the construction 2 ；
Wherein the high direction water cone radius R of the structure 1 Satisfies the following conditions: pi R 1 2 +(K*R 1 ) 2 ]*h/2*D*E＝T；
The structure has a low directional water cone radius R 2 Satisfies the following conditions: r 2 ＝K*R 1 。
Optionally, the determining the formation high directional potential and the formation low directional potential of the production well according to the production pressure differential potential of the production zone of the production well and the fluid potential of the production zone respectively includes:
determining a difference between the fluid potential energy and the production differential pressure potential energy as a formation high directional potential energy of the production well;
determining a sum of the fluid potential energy and the production differential pressure potential energy as a formation low directional potential energy of the production well.
Optionally, before the separately determining a formation high directional potential energy and a formation low directional potential energy of the production well, the method further comprises:
determining a fluid potential energy φ of the production zone, the fluid potential energy φ satisfying:
φ＝gZ+P/ρ；
wherein Z is the elevation of the production zone, P is the static pressure of the production zone, rho is the density of the crude oil, and g is the acceleration of gravity.
Optionally, after the determining the configuration high direction water cone radius and the configuration low direction water cone radius by using the volume method, the method further includes:
and determining a new development well position according to the radius of the water cone in the high direction of the structure and the radius of the water cone in the low direction of the structure.
In another aspect, an apparatus for determining a radius of a water cone of an edge water reservoir is provided, the apparatus comprising:
the system comprises a first determination module, a second determination module and a third determination module, wherein the first determination module is used for respectively determining the construction high-direction potential energy and the construction low-direction potential energy of a production well according to the production differential pressure potential energy of a production zone of the production well and the fluid potential energy of the production zone;
the acquisition module is used for acquiring the accumulated oil production of the production well in the production zone;
and the second determination module is used for determining the radius of the constructed high-direction water cone and the radius of the constructed low-direction water cone of the production well by using a volume method according to the ratio and the accumulated oil production.
Optionally, the second determining module includes:
the obtaining submodule is used for obtaining the layer thickness h, the single storage coefficient D and the calibrated recovery ratio E of a production layer of the production well;
a determination submodule for determining the formation high directional water cone radius R according to the ratio K, the accumulated oil production T, the layer thickness h, the single storage coefficient D and the calibrated recovery factor E 1 And the low directional water cone radius R of the construction 2 ；
Wherein the high direction water cone radius R of the structure 1 Satisfies the following conditions: pi R 1 2 +(K*R 1 ) 2 ]*h/2*D*E＝T；
The structure has a low water cone radius R 2 Satisfies the following conditions: r 2 ＝K*R 1 。
Optionally, the first determining module is configured to:
determining a difference between the fluid potential energy and the production differential pressure potential energy as a formation high directional potential energy of the production well;
determining a sum of the fluid potential energy and the production differential pressure potential energy as a formation low directional potential energy of the production well.
Optionally, the apparatus further comprises:
a third determination module to determine a fluid potential energy φ of the production zone, the fluid potential energy φ satisfying:
φ＝gZ+P/ρ；
wherein Z is the elevation of the production zone, P is the static pressure of the production zone, rho is the density of the crude oil, and g is the acceleration of gravity.
Optionally, the apparatus further comprises:
and the fourth determination module is used for determining a new development well position according to the radius of the constructed high-direction water cone and the radius of the constructed low-direction water cone determined by the second determination module.
In yet another aspect, a computer-readable storage medium is provided, having instructions stored therein, which when run on a computer, cause the computer to perform the method for determining an edge water reservoir water cone radius of the above aspect.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
the embodiment of the invention provides a method and a device for determining the radius of an edge water reservoir water cone, which can respectively determine the structure high-direction potential energy and the structure low-direction potential energy of a production well according to the production differential pressure potential energy of a production zone of the production well and the fluid potential energy of the production zone, and determine the ratio of the structure low-direction water cone radius and the structure high-direction water cone radius of the production well according to the structure low-direction potential energy and the structure high-direction potential energy. And then, determining the radius of the high-direction water cone of the structure and the radius of the low-direction water cone of the structure by adopting a volume method according to the obtained accumulated oil production of the production well in the production zone and the ratio. Through the device, can accurately obtain the water cone radius of the water cone that the in-process formed was invaded at water to the limit water reservoir at the high orientation of production well structure and construct the water cone radius of low orientation to can be based on the size of these two different water cone radius ration discernment water cone scopes, and then can discern the remaining oil distribution potential area between the water cone in the production zone, improve the recovery ratio of production well.
Drawings
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 flow chart of a method for determining a radius of an edge water reservoir water cone according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for determining the radius of the water cone of the edge water reservoir according to the embodiment of the invention;
FIG. 3 is a schematic diagram of the potential energy of a monoclinic formation fluid provided by an embodiment of the present invention;
FIG. 4 is a longitudinal sectional view of an edge water reservoir water cut pattern provided by an embodiment of the present invention;
FIG. 5 is a schematic view of the bottom of a water cone for a production well according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an apparatus for determining a radius of a water cone of an edge water reservoir according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a second module according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another device for determining an edge water reservoir water cone half-diameter 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.
An embodiment of the present invention provides a method for determining a water cone radius of an edge water reservoir, and referring to fig. 1, the method may include:
The production zone of the production well refers to a reservoir layer which is produced by the production well, and the reservoir layer is an oil layer.
And 102, acquiring the accumulated oil production of the production well in the production zone.
And 103, taking the ratio of the structure low-direction potential energy to the structure high-direction potential energy as the ratio of the structure low-direction water cone radius to the structure high-direction water cone radius of the production well, and determining the structure high-direction water cone radius and the structure low-direction water cone radius by adopting a volume method according to the ratio and the accumulated oil production.
It should be noted that the determination method provided by the embodiment of the present invention can be used to determine the water cone radius of a production well whose production reaches the limit water content (i.e. the production well section is flooded with water and produces high water content).
In summary, the embodiment of the present invention provides a method for determining a radius of an edge water reservoir water cone, which respectively determines a structural high-direction potential energy and a structural low-direction potential energy of a production well according to a production differential pressure potential energy of a production zone of the production well and a fluid potential energy of the production zone, and determines a ratio of the structural low-direction water cone radius to the structural high-direction water cone radius of the production well according to the structural low-direction potential energy and the structural high-direction potential energy. And then, determining the radius of the high-direction water cone of the structure and the radius of the low-direction water cone of the structure by adopting a volume method according to the obtained accumulated oil production of the production well in the production zone and the ratio. By the method, the water cone radius of the water cone in the high construction direction and the water cone radius in the low construction direction formed in the water invasion process of the side water reservoir can be accurately obtained, so that the water cone range can be quantitatively identified according to the two different water cone radii, the residual oil distribution potential area between the water cones in the production zone can be identified, and the recovery ratio of the production well is improved.
Fig. 2 is another method for determining a radius of a water cone of an edge water reservoir according to an embodiment of the present invention, as shown in fig. 2, the method may include:
The fluid potential energy phi of the production layer can satisfy the following conditions: phi is gZ + P/P, which has units of joules/kilogram (J/Kg).
Wherein Z is the elevation of the producing zone, P is the static pressure of the producing zone, rho is the crude oil density of the producing zone, and g is the gravitational acceleration.
The elevation Z of the production zone may refer to the elevation of the middle of the production zone, i.e., the distance from the middle of the production zone to the datum level, in meters (m). The static pressure P of the pay zone refers to the hydrostatic pressure in the middle of the pay zone, which is the pressure in pascals (pa) generated by the fluid in the pay zone at a flow rate of 0.
For example, the elevation Z of a production zone of a production well is-1490 m, the hydrostatic P of the middle of the production zone is 14.7 megapascals (Mpa), and the density ρ of crude oil is 920 kilograms per cubic meter (Kg/m) 3 ) The gravitational acceleration g is 9.8 meters per second (m/s). Then, according to the above formula, the fluid potential energy phi of the producing zone is:
φ＝gZ+P/ρ＝9.8*(-1490)+14.7*10 6 /920＝1376.2J/Kg。
In an embodiment of the invention, the difference between the fluid potential energy and the production pressure differential potential energy may be determined as the formation high directional potential energy of the production well and the sum of the fluid potential energy and the production pressure differential potential energy may be determined as the formation low directional potential energy of the production well. Wherein, the potential energy of the production pressure difference is the potential energy generated by the production pressure difference, and the unit is J/Kg. The production pressure difference deltap refers to the difference between the static pressure and the flow pressure of a production layer when a production well produces, and the unit is pascal (pa), and the potential energy generated by the production pressure difference deltap can be expressed as deltap/rho.
FIG. 3 is a schematic diagram of the potential energy of a monoclinic formation fluid provided by an embodiment of the present invention, wherein the monoclinic formation means that the direction of inclination and the inclination angle of the formation are substantially uniform within a certain range. And a reservoir is a rock formation having interconnected pores that allow hydrocarbons to be stored and percolated therein. Referring to fig. 3, the direction of the formation pressure potential energy is specified to be a positive direction. The direction in which the contour line is higher than the contour line where the production well is located is the structural height direction of the production well, and correspondingly, the direction in which the contour line is lower than the contour line where the production well is located is the structural height direction of the production well. The scale bar in the schematic shown in fig. 3 is 1: 10000, 1 cm in the figure, corresponds toThe actual distance is 100 meters (m). As can be seen in fig. 3, the differential production pressure potential is directed towards the production well in both the high and low formation directions of the production well. In the direction of high formation direction of the production well, the formation pressure potential (i.e. the fluid potential of the production zone of the production well) is opposite to the direction of the production pressure difference potential Δ p/ρ, so that the high formation direction potential of the production well 1 Is the difference between the potential energy phi of the fluid and the potential energy Deltap/[ phi ] p of the production pressure difference 1 gZ + P/ρ - Δ P/ρ. However, in the low direction of the construction of the production well, the formation pressure potential energy phi and the production pressure difference potential energy Deltap/rho have the same direction, so the high and low direction potential energy phi of the construction of the production well 2 Is the sum of the potential energy phi of the fluid and the potential energy Deltapper of the production pressure difference, namely phi 2 ＝gZ+P/ρ+△p/ρ。
For example, the potential of fluid in a production zone of a production well is 1376.2J/Kg, the pressure difference Δ p is 4.1MPa, and the density ρ of crude oil is 920Kg/m 3 Then the tectonic high directional potential energy phi of the production well can be determined 1 Satisfies the following conditions: phi is a 1 gZ + P/rho-Deltap/rho-3080.3J/Kg, and the construction low directional potential energy phi of the production well can be determined 2 Satisfies the following conditions: phi is a 2 ＝gZ+P/ρ+△p/ρ＝5832.8J/Kg。
And step 203, taking the ratio of the structure low-direction potential energy to the structure high-direction potential energy as the ratio of the structure low-direction water cone radius to the structure high-direction water cone radius of the production well.
Since the properties of the production zone are the same in the same production zone, the fluid experiences a resistance F in the flow in the high and low formation directions Resistance device The same is true. The radius R for reserve in the low direction is constructed according to the law of conservation of energy Is low in Radius R for reserve in the direction of structural height Height of The ratio of the two can satisfy:
φ 2 /φ 1 ＝(F resistance device *R Is low in )/(F Resistance device *R Height of )＝R Is low in /R Height of 。
The reserve radius refers to the farthest distance from the well bore of the production zone from which the crude oil can flow into the well bore of the production well when the production well recovers oil in the production zone from which the production well was produced, and the distance gradually increases during the production of the production well. The borehole is a borehole passage formed by the drill bit from the surface to the bottom of the earth and the surface at the completion of the borehole.
FIG. 4 is a sectional side view of a water invasion pattern of an edge water reservoir according to an embodiment of the present invention, referring to FIG. 4, during the production process of a production well, along with the increase of the reserve utilization radius, edge water advances toward the production well along the bottom of a production zone, when the edge water meets the crude oil at point D, the edge water starts to taper upward, and since the fluid always flows from a high potential region to a low potential region, the water invasion to the high direction of the production well structure does not break through an equipotential line phi tangent to the bottom of the production zone L . And in the last production stage of the production well, the production fluid of the production well is high in water content and reaches more than 98%, the production well section is flooded by water, a water cone is formed around the production well section, and the radius of the water cone is approximately equal to the radius of the reserve of the production well at the moment. Since the diameter of the production well is between about 20cm and 30cm, it is much smaller than the reserve radius. Therefore, the projection of the production well on the bottom of the production stratum can be used as the center of the water cone bottom surface. The radius of the water cone in the low direction of the structure refers to the maximum distance from the center of the circle to the boundary of the water cone in the low direction of the structure. Correspondingly, the radius of the water cone in the high direction of the structure refers to the maximum distance from the center of the circle to the boundary of the water cone in the high direction of the structure.
Referring to fig. 4, the ONs are perforated sections of the production well through which crude oil in the production zone may pass into the tubing for transport out. The perforated interval has been surrounded by a water cone, i.e. the production well has been flooded. G. D is the intersection point of the water cone and the bottom of the production layer. The equipotential lines cross the point G, D and intersect the top of the pay zone at point E, F. MD is the radius for reserve in the low direction of the production well configuration, namely R Is low in MD. GM is the radius for reserve in the direction of the structural height of the production well, i.e. R Height of GM. The length of NM is the layer thickness of the pay zone of the production well, which can also be expressed in terms of the length of EC or FH, since EC and FH are parallel to NM. Typically, the production zone has a layer thickness of less than 15 meters, i.e., the length of EC and the length of FH are both less than 15 meters. The reserve take-up radius is typically greater than 100 meters, i.e., both the length of the GM and the length of the MD are greater than 100 meters.
AB crosses point O, parallel to the top of the layer, and intersects the equipotential line crossing point G, D at point A, B. OA represents the structural high direction water cone half diameter, OB represents the structural low direction water cone half diameter. Since the layer thickness of the pay zone is much smaller than the reserve radius, DH, CG are typically smaller than 1m, negligible compared to the water cone radius. The water cone is thus approximately equal to the radius of reserve for the producing well at that time, OA (i.e., R) 1 ) Approximately equal to MG, OB (i.e. R) 2 ) Approximately equal to MD.
Therefore, in the embodiment of the invention, the radius R can be used for the reserve of the production well in the high direction High (a) High directional water cone radius R as a formation for a production well 1 And the radius R can be used to reduce the reserve in the direction of the production well structure Is low in Low directional water cone radius R for construction of production wells 2 . It follows that the production well is constructed with a low directional potential energy phi 2 High direction potential energy phi of the structure 1 The ratio K is the radius R of the low-direction water cone of the production well 2 Radius R of water cone with high structure direction 1 A ratio of (i.e.,) 2 /φ 1 ＝K＝R 2 /R 1 。
Illustratively, the high directional potential of a formation for a production well is φ 1 under-3080.3J/Kg, the structure has low-direction potential energy of phi 2 At 5832.8J/Kg, the ratio R of the water cone radius in the low direction of the formation to the water cone radius in the high direction of the formation can be determined 2 /R 1 Comprises the following steps: r 2 /R 1 ＝R Is low in /R Height of ＝φ 2 /φ 1 ＝K＝1.9。
And step 204, acquiring the accumulated oil production of the production well in the production zone.
The cumulative oil recovery T is the total oil recovery in tons (T) during the time period from when the production well starts producing oil in the producing formation from which the production well was produced to when the water content of the oil produced by the production well reaches the limit water content (98%) and stops producing oil.
And step 205, obtaining the layer thickness h, the single storage coefficient D and the calibrated recovery ratio E of the production layer of the production well.
The layer thickness h refers to the thickness of the producing zone of the production well, i.e., the distance from the top of the producing zone to the bottom of the producing zone. The single reservoir coefficient refers to the geological reserve contained within a unit volume of the reservoir. The calibrated recovery ratio refers to the recovery ratio calibrated by recovery ratio calibration methods such as a water drive method and the like, and the recovery ratio refers to the ratio of the quantity of petroleum which can be recovered from an oil reservoir to the geological reserve.
FIG. 5 is a schematic bottom view of a water cone for a production well according to an embodiment of the present invention. Referring to FIG. 5, the production well is constructed with a high directional water cone radius R 1 Smaller than the radius R of the water cone in the low direction of the structure 2 . In an embodiment of the invention, the high directional water cone radius R is constructed with a production well 1 Recoverable reserve of half the volume of a cylinder of radius and low directional water cone radius R in a production well configuration 2 The sum of the recoverable reserves for half the volume of the radius cylinder is approximately equal to the cumulative oil production of the producing well in that producing zone. Therefore, the water cone half diameter in the high direction of the structure of the production well can be obtained by adopting a volume method, and the water cone radius in the low direction of the structure of the production well can be further obtained. The high direction water cone radius R of the structure 1 Satisfies the following conditions: pi R 1 2 +(K*R 1 ) 2 ]*h/2*D*E＝T。
The structure has a low water cone radius R 2 Satisfies the following conditions: r 2 ＝K*R 1 。
For example, the layer thickness h of a producing zone of a certain producing well is 8.6m, the single storage coefficient D is 15.1%, the calibrated recovery rate E is 0.3185, and the ratio K of the radius of the constructed low-direction water cone to the half diameter of the constructed high-direction water cone is 1.9; the cumulative oil recovery T is 0.59 ten thousand tons, i.e. T is 5900 tons (T). From the above formula for calculating the formation high direction water cone radius R1, one can obtain:
π*[R 1 2 +(1.9*R 1 ) 2 ]*8.6/2*15.1％*0.3185＝5900；
solving to obtain the structure high direction water cone radius R of the production well 1 44.4 meters (m).
Further, the radius R of the low-direction water cone is calculated and constructed according to the method 2 The formula of (a) can be solved to obtain: r 2 ＝K*R 1 1.9 × 44.4 ═ 84.3 meters (m).
And step 207, determining a new development well position according to the constructed high-direction water cone radius and the constructed low-direction water cone radius of the production well.
During reservoir development, multiple production wells are typically deployed for production. After each production well is flooded with water at the end of its development, the water cone radius for each production well may be determined using the method illustrated in steps 201 through 206 above. According to the radius of the water cone in the high construction direction and the radius of the water cone in the low construction direction of each production well, the water flooded area of each production well can be quantitatively depicted, and the size of each water cone range can be quantitatively identified, so that the remaining oil distribution potential area among the water cones can be identified, and a new development well position can be determined in the remaining oil distribution potential area among the water cones. And then, the worker can deploy a new well to submerge according to the development well position. Because of phi 2 /φ 1 The smaller the medium production pressure difference deltap is, the larger the reserve-to-output ratio of the production well in the low-construction direction is, and because the radius of the water cone in the high-construction direction of the production well is smaller than that of the water cone in the low-construction direction, the residual oil potential in the production layer at the high-construction direction of the production well with the historical low production pressure difference is higher, particularly the production well with the historical low production pressure difference has higher potential in the high-construction direction, so that a new development well position is generally deployed among the water cones at the high-construction position.
Optionally, the order of the steps of the method for determining the radius of the water cone of the edge water reservoir provided by the embodiment of the invention can be properly adjusted, and the steps can be correspondingly increased or decreased according to the situation. For example, step 204 and step 205 may be executed synchronously with step 203, or may be executed before step 203. 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 embodiment of the present invention provides a method for determining a radius of an edge water reservoir water cone, which respectively determines a structural high-direction potential energy and a structural low-direction potential energy of a production well according to a production pressure difference of a production zone of the production well and a fluid potential energy of the production zone, and determines a ratio of the structural high-direction water cone radius and the structural low-direction water cone radius of the production well according to the structural high-direction potential energy and the structural low-direction potential energy. And then, determining the radius of the water cone in the high direction of the structure and the radius of the water cone in the low direction of the structure by adopting a volume method according to the obtained accumulated oil production of the production well in the production layer and the ratio. By the method, the water cone radius of the water cone in the high construction direction and the water cone radius in the low construction direction, which are formed in the water invasion process of the side water reservoir, can be accurately obtained, so that the water cone range can be quantitatively identified according to the two different water cone radii, the residual oil distribution potential area between the water cones in the production layer can be identified, and the recovery ratio of the production well is improved. In addition, the water cone range of the edge water reservoir determined by the method has higher accuracy than that of the water cone range determined by the bottom water reservoir water invasion model, so that the water flooded area of the edge water reservoir depicted by the method is more accurate, and the deployment of a new development well position can be ensured to be more accurate.
An embodiment of the present invention provides a device for determining a water cone radius of an edge water reservoir, and referring to fig. 6, the device may include:
the first determining module 601 is used for respectively determining the construction high directional potential energy and the construction low directional potential energy of the production well according to the production pressure difference potential energy of the production zone of the production well and the fluid potential energy of the production zone.
An obtaining module 602, configured to obtain a cumulative oil production of the production well in the production zone.
A second determining module 603, configured to use a ratio of the formation high-direction potential energy to the formation low-direction potential energy as a ratio of a formation high-direction water cone radius to a formation low-direction water cone radius of the production well, and determine the formation high-direction water cone radius and the formation low-direction water cone radius by using a volumetric method according to the ratio and the accumulated oil production.
In summary, the present invention provides an apparatus for determining a water cone radius of an edge water reservoir, which can determine a high directional structural potential and a low directional structural potential of a production well according to a production differential pressure potential of a production zone of the production well and a fluid potential of the production zone, and determine a ratio of the high directional structural water cone radius to the low directional structural water cone radius of the production well according to the high directional structural potential and the low directional structural potential. And then, determining the radius of the high-direction water cone of the structure and the radius of the low-direction water cone of the structure by adopting a volume method according to the obtained accumulated oil production of the production well in the production zone and the ratio. The determining device can accurately obtain the water cone radius of the water cone formed in the water invasion process of the boundary water reservoir in the high-structure direction and the water cone radius in the low-structure direction, so that the size of the water cone range can be quantitatively identified according to the two different water cone radii, the remaining oil distribution potential area between the water cones in the production layer can be identified, and the recovery ratio of the production well is improved.
Fig. 7 is a schematic structural diagram of a second module according to an embodiment of the present invention. As shown in fig. 7, the second determining module 603 includes:
and the obtaining submodule 6031 is used for obtaining the layer thickness h, the single storage coefficient D and the calibrated recovery ratio E of the production layer of the production well.
A determination submodule 6032 for determining the water cone radius R in the high direction of formation from the ratio K, the accumulated oil production T, the layer thickness h, the single storage coefficient D and the calibrated recovery E 1 And constructing a low directional water cone radius R 2 。
Wherein the structure has a high water cone radius R 1 Satisfies the following conditions: pi R 1 2 +(K*R 1 ) 2 ]*h/2*D*E＝T；
The structure has a low water cone radius R 2 Satisfies the following conditions: r 2 ＝K*R 1 。
Optionally, the first determining module 601 is further configured to:
determining the difference between the fluid potential energy and the production pressure differential potential energy as the tectonic high directional potential energy of the production well;
the sum of the fluid potential energy and the production differential pressure potential energy is determined as the formation low directional potential energy of the production well.
Fig. 8 is another device for determining the water cone half-diameter of the side water reservoir according to the embodiment of the invention. Referring to fig. 8, the determining means may further include:
a third determination module 604 for determining a fluid potential energy φ of a production zone of the production well, the fluid potential energy φ satisfying:
φ＝gZ+P/ρ；
wherein Z is the elevation of the production zone, P is the static pressure of the production zone, ρ is the density of the crude oil, and g is the acceleration of gravity.
And a fourth determining module 605, configured to determine a new development well position according to the radius of the constructed high-direction water cone and the radius of the constructed low-direction water cone determined by the second determining module.
In summary, the present invention provides an apparatus for determining a radius of a water cone of an edge water reservoir, which can determine a high directional potential energy and a low directional potential energy of a structure of a production well according to a production pressure difference of a production zone of the production well and a fluid potential energy of the production zone of the production well, and further determine a ratio of the radius of the water cone of the structure of the production well to the radius of the water cone of the structure of the production well according to the high directional potential energy and the low directional potential energy of the structure. And then, determining the radius of the high-direction water cone of the structure and the radius of the low-direction water cone of the structure by adopting a volume method according to the obtained accumulated oil production of the production well in the production zone and the ratio. The determining device can accurately obtain the water cone radius of the water cone formed in the water invasion process of the boundary water reservoir in the high-structure direction and the water cone radius in the low-structure direction, so that the size of the water cone range can be quantitatively identified according to the two different water cone radii, the remaining oil distribution potential area between the water cones in the production layer can be identified, and the recovery ratio of the production well is improved. In addition, the water cone range of the edge water reservoir determined by the method has higher accuracy than that of the water cone range determined by the bottom water reservoir water invasion model, so that the water flooded area of the edge water reservoir depicted by the method is more accurate, and the deployment of a new development well position can be ensured to be more accurate.
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.
The embodiment of the invention also provides a computer-readable storage medium, wherein instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium runs on a computer, the computer is enabled to execute the method for determining the edge water reservoir water cone radius provided by the above method embodiment.
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 for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (8)
1. A method for determining a radius of a water cone of an edge water reservoir, the method comprising:
respectively determining the construction high directional potential energy and the construction low directional potential energy of the production well according to the production differential pressure potential energy of the production layer of the production well and the fluid potential energy of the production layer;
obtaining the cumulative oil production of the production well in the production zone;
taking the ratio of the constructed low-direction potential energy to the constructed high-direction potential energy as the ratio of the constructed low-direction water cone radius to the constructed high-direction water cone radius of the production well, and determining the constructed high-direction water cone radius and the constructed low-direction water cone radius by adopting a volume method according to the ratio and the accumulated oil production;
determining the radius of the water cone in the high direction of the structure and the radius of the water cone in the low direction of the structure by adopting a volume method according to the ratio and the accumulated oil production, wherein the method comprises the following steps:
obtaining the layer thickness h, the single storage coefficient D and the calibrated recovery ratio E of a production layer of the production well;
determining the radius R of the constructed high-direction water cone according to the ratio K, the accumulated oil production T, the layer thickness h, the single storage coefficient D and the calibrated recovery ratio E 1 And the low directional water cone radius R of the construction 2 ；
Wherein the high direction water cone radius R of the structure 1 Satisfies the following conditions: pi R 1 2 +(K*R 1 ) 2 ]*h/2*D*E＝T；
The structure has a low water cone radius R 2 Satisfies the following conditions: r 2 ＝K*R 1 。
2. The method of claim 1, wherein determining a formation high directional potential and a formation low directional potential of the production well from a differential production pressure potential of a production zone of the production well and a fluid potential of the production zone, respectively, comprises:
determining a difference between the fluid potential energy and the production differential pressure potential energy as a formation high directional potential energy of the production well;
determining a sum of the fluid potential energy and the production differential pressure potential energy as a formation low directional potential energy of the production well.
3. The method of claim 1 or 2, wherein prior to said separately determining a formation high directional potential energy and a formation low directional potential energy for said production well, said method further comprises:
determining a fluid potential energy phi of the production zone, the fluid potential energy phi satisfying:
φ＝gZ+P/ρ；
wherein Z is the elevation of the production zone, P is the static pressure of the production zone, rho is the density of the crude oil, and g is the acceleration of gravity.
4. The method of claim 1 or 2, wherein after said determining said formation high directional water cone radius and said formation low directional water cone radius using a volumetric method, said method further comprises:
and determining a new development well position according to the radius of the water cone in the high direction of the structure and the radius of the water cone in the low direction of the structure.
5. An apparatus for determining a radius of a water cone of an edge water reservoir, the apparatus comprising:
the system comprises a first determination module, a second determination module and a third determination module, wherein the first determination module is used for respectively determining the construction high-direction potential energy and the construction low-direction potential energy of a production well according to the production differential pressure potential energy of a production zone of the production well and the fluid potential energy of the production zone;
the acquisition module is used for acquiring the accumulated oil production of the production well in the production zone;
the second determination module is used for determining the ratio of the constructed low-direction potential energy to the constructed high-direction potential energy as the ratio of the constructed low-direction water cone radius to the constructed high-direction water cone radius of the production well, and determining the constructed high-direction water cone radius and the constructed low-direction water cone radius by adopting a volumetric method according to the ratio and the accumulated oil production;
the second determining module includes:
the obtaining submodule is used for obtaining the layer thickness h, the single storage coefficient D and the calibrated recovery ratio E of a production layer of the production well;
a determination submodule for determining the formation high directional water cone radius R according to the ratio K, the accumulated oil production T, the layer thickness h, the single storage coefficient D and the calibrated recovery factor E 1 And the low directional water cone radius R of the construction 2 ；
Wherein the high direction water cone radius R of the structure 1 Satisfies the following conditions: pi R 1 2 +(K*R 1 ) 2 ]*h/2*D*E＝T；
The structure has a low water cone radius R 2 Satisfies the following conditions: r is 2 ＝K*R 1 。
6. The apparatus of claim 5, wherein the first determining module is configured to:
determining a difference between the fluid potential energy and the production differential pressure potential energy as a formation high directional potential energy of the production well;
determining a sum of the fluid potential energy and the production differential pressure potential energy as a formation low directional potential energy of the production well.
7. The apparatus of claim 5 or 6, further comprising:
a third determination module to determine a fluid potential energy φ of the production zone, the fluid potential energy φ satisfying:
φ＝gZ+P/ρ；
wherein Z is the elevation of the production zone, P is the static pressure of the production zone, rho is the density of the crude oil, and g is the acceleration of gravity.
8. The apparatus of claim 5 or 6, further comprising:
and the fourth determination module is used for determining a new development well position according to the radius of the constructed high-direction water cone and the radius of the constructed low-direction water cone determined by the second determination module.
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