CN115081694B - Quantitative evaluation method and device for encryption potential of offshore thin interbed sandstone oil field - Google Patents
Quantitative evaluation method and device for encryption potential of offshore thin interbed sandstone oil field Download PDFInfo
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Abstract
The invention relates to a quantitative evaluation method, a device, a medium and equipment for encryption potential of an offshore thin interbed sandstone oil field, wherein the method comprises the following steps: establishing a sea thin interbed sandstone oilfield reservoir type division standard according to reservoir development characteristics, and determining the type of each longitudinal layer of a target oilfield; establishing a quality dividing standard of offshore thin interbed sandstone oil field reserves according to the viscosity of underground crude oil, and determining different reserves quality conditions of a target oil field; establishing a recovery ratio prediction model of the offshore thin interbed sandstone oil field based on reserve quality, and forming a target oil field recovery ratio change chart; establishing a single well cumulative oil increasing quantity prediction model of the offshore thin interbed sandstone oil field considering the reserve quality difference, and forming a target oil field Shan Jinglei oil increasing quantity change chart; the oil field encryption potential is qualitatively judged according to the target oil field single well economic critical oil accumulation and increase quantity by using a target oil field single well oil accumulation and increase quantity prediction model or a plate; and determining the number of the target oil field encryption potential wells according to the target oil field encryption potential condition.
Description
Technical Field
The invention relates to a quantitative evaluation method, a device, a medium and equipment for encryption potential of an offshore thin interbed sandstone oil field, and belongs to the technical field of petroleum and natural gas exploitation.
Background
At present, offshore oil fields in China enter the later development stage successively, production contradictions are increasingly prominent, the yield situation is gradually severe, and encryption and diving are urgently needed to be carried out. The phenomenon is more prominent in offshore thin interbed sandstone oil fields, mainly because the reservoir development characteristics of the thin interbed oil reservoir are different from those of conventional oil reservoirs, the longitudinal span is large, a plurality of sets of oil groups are often developed, the number of small layers in the same oil group is large, the effective thickness of a single layer is thin, the spreading range of sand bodies is limited, the effective thickness of the single layer, the permeability and the like are obviously different, and the fluid properties are greatly changed in the plane and the longitudinal direction. In general, there is a significant difference in planar, longitudinal reserve quality. Meanwhile, the existing injection and production well spacing (300-500 m) of the offshore thin interbed sandstone oil field is poor in suitability for the range (100-300 m) of sand spread of a non-main force layer, the actual water drive control degree of the non-main force layer is low, reserves are basically unused, and the oil field yield is difficult to maintain. Therefore, the encryption and submerging research of the offshore thin interbed sandstone oil field often needs to supplement encryption wells so as to reduce the injection and production well spacing and improve the injection and production effective condition of the non-main force layer and the water flooding effect. However, production practice experience shows that as water flooding development enters a later stage, the flooding degree of the dominant reservoir of the offshore thin interbed sandstone oil field is increased, the extraction degree of the dominant reservoir is increased, and the initial water content, the productivity and the oil increasing effect of a new production well are all poor year by year. Therefore, in order to improve the development effect of the oil field, the well spacing of the injection and production is reduced, the production capacity and the oil increment of the newly produced well are too low to meet the requirements of offshore oil field economy due to the fact that the encryption and mining scheme is not practical. Therefore, how to accurately evaluate the self-encryption potential of the offshore thin interbed sandstone oilfield development later stage on the premise of guaranteeing the economy is very important for oilfield managers.
Disclosure of Invention
Aiming at the technical problems, the invention provides a quantitative evaluation method, a device, a medium and equipment for encryption potential of an offshore thin interbed sandstone oil field based on reserve quality difference.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
A quantitative evaluation method for encryption potential of an offshore thin interbed sandstone oil field comprises the following steps:
Based on production practice, establishing a thin interbed sandstone oilfield reservoir type division standard at sea according to reservoir development characteristics, and determining the type of each longitudinal layer of a target oilfield;
Establishing offshore thin interbed sandstone oilfield reserves quality division standards according to the viscosity of underground crude oil by combining the reservoir type division standards, and determining different reserves quality conditions of a target oilfield;
According to the development characteristics of the offshore thin interbed sandstone oil field reservoir, establishing an offshore thin interbed sandstone oil field recovery ratio prediction model based on reserve quality, predicting a target oil field recovery ratio change rule, and forming a target oil field recovery ratio change pattern;
Establishing a single well cumulative oil increasing quantity prediction model of the offshore thin interbed sandstone oil field considering the reserve quality difference, and forming a target oil field Shan Jinglei oil increasing quantity change chart by combining a target oil field actual condition prediction Shan Jinglei oil increasing change rule;
Judging the encryption potential of the oil field qualitatively according to the economic critical cumulative oil quantity of the single well of the development well and the sidetracking well of the target oil field by using a target oil field single well cumulative oil quantity prediction model or a change plate;
and determining the number of the oil field encryption potential wells and the oil enhancement amount according to the encryption potential conditions of the target oil field.
According to the quantitative evaluation method for the encryption potential of the offshore thin interbed sandstone oil field, preferably, based on production practice, a classification standard of the offshore thin interbed sandstone oil field reservoir types is established according to the development characteristics of the reservoir, and the types of the longitudinal layers of the target oil field are determined, wherein the method comprises the following specific steps:
Dividing the offshore thin interbed sandstone oil field into i types according to the spreading range of sand bodies, the effective thickness, the sand-to-ground ratio and the permeability, wherein i=1, 2 and 3; the effective thickness of the dominant layer in the marine thin interbedded sandstone oil field is large, the physical property is good, the plane spreading range of the sand body is large, and the sand body is divided into 1 types; the effective thickness of the thin difference layer is small, the physical property is poor, the plane spreading range of the sand body is limited, and the sand body is divided into 2 and 3 types.
In the quantitative evaluation method for the encryption potential of the offshore thin interbed sandstone oil field, preferably, the reservoir type division standard is combined, the offshore thin interbed sandstone oil field reservoir quality division standard is established according to the viscosity of underground crude oil, and different reservoir quality conditions of a target oil field are determined, wherein the quantitative evaluation method comprises the following specific steps:
And determining the reserve scale G ij with different quality according to the reservoir type i to which the reserve belongs and the crude oil viscosity interval j to which the reserve belongs, so as to determine the quality conditions of different reserves of the target oil field.
According to the quantitative evaluation method for the encryption potential of the offshore thin interbed sandstone oil field, preferably, the offshore thin interbed sandstone oil field is established based on a recovery ratio prediction model of reserve quality as follows:
Wherein E R is the offshore thin interbed sandstone oilfield recovery ratio; m is stratum coefficient; t is the injection and production efficiency coefficient; d is the injection well spacing; g is the geological reserve; i. j is a subscript symbol, a subscript-carried symbol refers to a parameter corresponding to the reserve quality, and no subscript symbol refers to a parameter of the target oilfield.
In the method for quantitatively evaluating the encryption potential of the offshore thin interbed sandstone oil field, preferably, a single-well cumulative oil increasing quantity prediction model taking the reserve quality difference into consideration of the offshore thin interbed sandstone oil field is established, and a target oil field Shan Jinglei oil increasing quantity change chart is formed by combining a target oil field actual condition prediction Shan Jinglei oil increasing change rule, wherein the method comprises the following specific steps:
establishing a single well cumulative oil quantity prediction model by using the derivative of the formula (1):
Predicting the actual Shan Jinglei oil-increasing change rule of the target oil field according to the formula (5);
single well control reserves N of conventional drainage pattern and injection and production well spacing D:
wherein N is the well control reserve of a single well; s is the oil-containing area of the oil field; r is Shan Jinglei for increasing oil quantity;
based on the prediction result of the formula (5), a change chart of the oil increasing amount C o of the target oil field Shan Jinglei along with the well control reserve of the single well is established by using the formula (6).
According to the quantitative evaluation method for the encryption potential of the offshore thin interbed sandstone oil field, preferably, a target oil field single well accumulated oil quantity prediction model or a change chart is utilized, and the oil field encryption potential is qualitatively judged according to the economic critical accumulated oil quantity of a target oil field development well and a single well of side drilling, wherein the method comprises the following steps:
Determining the critical cumulative oil quantity R 1 of the development well and the critical cumulative oil quantity R 2 of the sidetracking well according to the actual condition of the target oil field; determining a single well control reserve N 0 of the target oil field at the current stage; intercepting a Shan Jinglei oil-increasing amount and single well control reserves relation chart by utilizing a development well and side drilling single well economic critical accumulated oil-increasing amount R 1、R2, taking single well critical well control reserves N 1、N2 corresponding to two intercepting points, and judging the encryption potential of a target oil field under the limit of economic conditions according to the relation between N 1、N2 and N 0:
a) When N 1>N2>N0 is adopted, the target oil field does not have encryption potential;
b) When N 0>N1>N2 is high, the encryption potential of the target oil field is high, and a newly built platform is recommended to carry out integral encryption;
c) When N 1>N0>N2, the target field encryption potential is small, it is recommended to consider using sidetracking well partial encryption.
According to the quantitative evaluation method for the encryption potential of the offshore thin interbed sandstone oil field, preferably, the number of wells with the encryption potential of the target oil field and the target oil enhancement amount are determined according to the encryption potential condition of the target oil field, and the quantitative evaluation method specifically comprises the following steps:
① For a target oil field (N 0>N1>N2) with integral encryption potential, calculating the maximum workload N 1、n2 of development wells and sidetracking wells under the allowable economic conditions by using the difference values of the formula (7) and the formula (8):
predicting the target oil field encryption accumulated oil increase amount by using the formula (9):
Rs＝n1·R1+n2·R2 (9)
Wherein n 1、n2 is the maximum workload of a development well and a sidetracking well under the condition of target oilfield economic conditions; r s is the maximum oil enhancement amount of the target oil field under the limit of economic conditions;
② For a target oil field (N 1>N0>N2) with local encryption potential, calculating the lateral maximum work load N 3 under economic conditions using equation (10):
predicting the target oil field encryption accumulated oil increase amount by using the formula (11):
Rs＝n2·R2 (11)。
the second aspect of the invention provides a quantitative evaluation device for encryption potential of a marine thin interbed sandstone oil field, which comprises:
The first processing unit is used for establishing a sea thin interbed sandstone oilfield reservoir type division standard according to reservoir development characteristics based on production practice, and determining the type of each longitudinal layer of the target oilfield;
The second processing unit is used for combining reservoir type division standards, establishing offshore thin interbed sandstone oil field reserve quality division standards according to the viscosity of underground crude oil, and determining different reserve quality conditions of a target oil field;
the third processing unit is used for establishing a recovery ratio prediction model of the offshore thin interbed sandstone oil field based on reserve quality according to the development characteristics of the offshore thin interbed sandstone oil field, predicting a target oil field recovery ratio change rule and forming a target oil field recovery ratio change chart;
The fourth processing unit is used for establishing a single well cumulative oil increasing quantity prediction model of the offshore thin interbed sandstone oil field considering the reserve quality difference, and forming a target oil field Shan Jinglei oil increasing quantity change chart by combining a target oil field actual condition prediction Shan Jinglei oil increasing change rule;
The fifth processing unit is used for qualitatively judging the encryption potential of the oil field according to the economic critical cumulative oil quantity of the single well of the development well and the sidetracking well of the target oil field by utilizing the target oil field single well cumulative oil quantity prediction model or the change plate;
and the sixth processing unit is used for determining the number of the target oil field encryption potential wells and the target oil increasing amount according to the target oil field encryption potential condition.
A third aspect of the present invention provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the above-described method for quantitatively evaluating encryption potential of an offshore thin interbed sandstone oilfield.
A fourth aspect of the present invention provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the above-described method for quantitatively evaluating the encryption potential of an offshore thin interbed sandstone oilfield when the computer program is executed.
Due to the adoption of the technical scheme, the invention has the following advantages:
The method is mainly used for solving the problems that the implementation effect of new drilling is deteriorated year by year in the later stage of the development of the offshore thin interbed sandstone oil field, and simultaneously, the drilling conditions and the processing capacity of engineering facilities are limited, so that the encryption and diving scheme has high investment cost and high risk, and the economic and effective development is difficult to realize. The method is clear in principle, objective in calculation result and high in operability, and can effectively guide the design work of the encryption and excavation scheme of the offshore thin interbedded sandstone oil field, so that the economy and feasibility of the encryption and excavation scheme are guaranteed to the greatest extent.
Drawings
FIG. 1 is a schematic illustration of a P field recovery change chart provided in accordance with one embodiment of the present invention;
FIG. 2 shows the variation of the oil increment of the P oil field Shan Jinglei according to the embodiment of the present invention;
FIG. 3 is a schematic diagram of the oil field Shan Jinglei oil-up change of the P oil field according to the example of the present invention;
Fig. 4 is a P-field encryption potential analysis chart provided by this embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are intended to be within the scope of the present disclosure.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," "third," "fourth," and the like as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
The invention provides a quantitative evaluation method for encryption potential of an offshore thin interbed sandstone oil field, which is mainly used for solving the problems that the implementation effect of new drilling is poor in the later stage of the development of the offshore thin interbed sandstone oil field, the drilling condition and the processing capacity of engineering facilities are limited one by one, the investment cost of the encryption and excavation scheme is high, the risk is high and the economic and effective development is difficult to realize. The method provided by the invention has the advantages of clear principle, objective calculation result and strong operability, and can effectively guide the design work of the encryption and excavation scheme of the offshore thin interbedded sandstone oil field, so that the economy and feasibility of the encryption and excavation scheme are ensured to the greatest extent.
The technical scheme of the invention is described below with reference to specific embodiments.
The invention provides a quantitative evaluation method for encryption potential of a marine thin interbed sandstone oil field based on reserve quality difference, which comprises the following steps:
(1) Based on production practice experience, establishing a thin interbed sandstone oilfield reservoir type division standard at sea according to reservoir development characteristics, and determining the type of each longitudinal layer of the target oilfield.
The physical property differences of reservoirs among longitudinal layers of the offshore thin interbed sandstone oil field are obvious and the spreading range of sand bodies is different under the influence of deposition and hydrodynamic evolution. Based on production practice experience, the effective thickness of an advantage layer in the offshore thin interbedded sandstone oil field is large, the physical property is good, the plane spreading range of the sand body is large, and the sand body is divided into 1 types; the effective thickness of the thin difference layer is small, the physical property is poor, the plane spreading range of the sand body is limited, and the sand body is divided into 2 and 3 types. By analyzing the rule of influence of reservoir physical properties on development effect, establishing a classification standard (table 1) of the offshore thin interbed sandstone oilfield reservoir based on the reservoir physical properties by combining industry standards, and determining the type of each longitudinal layer of the target oilfield.
TABLE 1 offshore thin interbed sandstone oilfield small scale classification criteria
(2) And establishing offshore thin interbed sandstone oilfield reserves quality division standards according to the viscosity of underground crude oil by combining the reservoir type division standards, and determining different reserves quality conditions of the target oilfield.
With the increase of the burial depth, the viscosity of crude oil in each layer of the longitudinal direction of the offshore thin interbedded sandstone oil field is greatly different, and the development effect and the law are different. And analyzing the influence rule of the viscosity of crude oil on the development effect by combining the reservoir type division condition, and establishing the quality division standard (table 2) of the offshore thin interbed sandstone oilfield reserves. The reserve quality of the target field was counted according to the partitioning criteria in table 2. G ij in Table 2 is the different quality reserve scale, 10 4m3; i. j is a subscript symbol, i=1, 2,3 corresponds to the reservoir type to which the reserve belongs, and j=1, 2,3,4,5 corresponds to the crude oil viscosity interval to which the reserve belongs.
TABLE 2 quality of small reservoir quality criteria for offshore thin interbed sandstone fields
(3) And establishing an offshore thin interbed sandstone oil field recovery ratio prediction model based on reserve quality aiming at the development characteristics of the thin interbed reservoir, and predicting the target oil field recovery ratio change rule.
Aiming at the characteristic that the spread range difference of different types of small-layer sand bodies of the offshore thin interbed sandstone oil reservoir is large, the traditional recovery ratio calculation model defaults that the reserves with different qualities are all full injection and production effects, the adaptation relation between the spread range of the sand bodies and the injection and production well spacing is not considered, the prediction result is optimistic, and the method cannot be applied to offshore thin interbed sandstone oil fields.
The method comprises the steps of taking the characteristics of large difference of physical properties of reservoirs with different qualities and injection and production receiving efficiency of the offshore thin interbed sandstone oil field into consideration, introducing stratum coefficient M and injection and production receiving efficiency coefficient T to correct a traditional recovery ratio calculation model, and establishing a recovery ratio prediction model of the offshore thin interbed sandstone oil field based on the quality of the reservoirs:
Wherein,
Tij＝aarctan(b(dij-D))+c (4)
Wherein E R is the offshore thin interbed sandstone oilfield recovery ratio,%; m is a stratum coefficient, wherein K is average effective permeability and mD; h is the average effective thickness, mD; mu is the average formation crude oil viscosity, mPa.s; t is an injection and production efficiency coefficient, wherein D is an injection and production well distance and m; d is the spreading width of the sand body, m; g is the geological reserve, 10 4m3; i. j is a subscript symbol, a subscript-carried symbol refers to a parameter corresponding to the reserve quality, and no subscript symbol refers to a parameter of the target oilfield.
The values of the a, b and c parameters are determined by fitting typical oilfield actual production data (table 3). The recovery ratio change rule of the offshore thin interbed sandstone oil field can be accurately predicted by using the formula (1), so that a recovery ratio change pattern of a target oil field is formed.
Table 3 offshore thin interbed sandstone field recovery calculation model parameters table
(4) And establishing a single well cumulative oil increasing quantity prediction model of the offshore thin interbed sandstone oil field considering the reserve quality difference, and predicting Shan Jinglei the oil increasing change rule by combining the actual condition of the target oil field.
Establishing a single well cumulative oil quantity prediction model by using the derivative of the formula (1):
the actual Shan Jinglei oil-increasing change rule of the target oil field can be predicted according to the formula (5).
Single well control reserves N of conventional drainage pattern and injection and production well spacing D:
Wherein N is the well control reserve of a single well, 10 4m3/port; s is the oil-containing area of the oil field, and m 2; r is Shan Jinglei for increasing oil quantity, 10 and 4m3.
Based on the prediction result of the formula (5), a change chart of the oil increasing amount C o of the target oil field Shan Jinglei along with the well control reserve of the single well can be further established by using the formula (6).
(5) And qualitatively judging the encryption potential of the oil field according to the economic critical cumulative oil quantity of the single well of the side drilling well of the target oil field by utilizing a target oil field single well cumulative oil quantity prediction model or a plate.
The later-stage encryption well of the offshore old oil field comprises two types of development wells and sidetracking wells, the investment cost of the development wells is high, the requirements on the oil quantity increased by economic critical single well are high, the investment cost of sidetracking wells is low, and the requirements on the oil quantity increased by economic critical single well are low.
① And determining the critical cumulative oil quantity R 1 of the development well and the critical cumulative oil quantity R 2 of the sidetracking well according to the actual condition of the target oil field.
② Determining the well control reserves N 0 of a single well at the current stage of the target oil field, namely the ratio of the total reserves of the oil field to the total number of the produced wells at the current stage;
③ And calculating a single-well critical injection and production well distance D 1,D2 corresponding to the single-well economic critical cumulative oil quantity R 1、R2 by using the formula (6), and substituting the single-well critical injection and production well distance D 1,D2 into the formulas (5) and (6) to calculate the single-well critical well control reserve N 1、N2. In order to facilitate application, it is recommended to directly use the economic critical accumulated oil quantity R 1、R2 of the development well and the sidetrack well to cut off the relation chart of Shan Jinglei oil quantity and single well control reserves, and take the single well critical well control reserves N 1、N2 corresponding to the two cut-off points.
④ Judging the encryption potential of the target oil field under the limit of economic conditions according to the relation between N 1、N2 and N 0:
a) When N 1>N2>N0, the target oil field does not have encryption potential.
B) When N 0>N1>N2 is reached, the encryption potential of the target oil field is large, and a new platform is recommended to carry out integral encryption.
C) When N 1>N0>N2, the target field encryption potential is small, it is recommended to consider using sidetracking well partial encryption.
(6) And determining the number of the oil field encryption potential wells and the oil enhancement amount according to the encryption potential conditions of the target oil field.
① For a target oil field (N 0>N1>N2) with integral encryption potential, calculating the maximum workload N 1、n2 of development wells and sidetracking wells under the allowable economic conditions by using the difference values of the formula (7) and the formula (8):
predicting the target oil field encryption accumulated oil increase amount by using the formula (9):
Rs＝n1·R1+n2·R2 (9)
Wherein N 0 is the current well control reserve of the target oil field, 10 4m3;N1、N2 is the economic critical well control reserve of the target oil field development well and the side drilling single well, 10 4m3;n1、n2 is the maximum workload of the development well and the side drilling well under the condition of economic condition of the target oil field, R s is the encryption maximum oil increasing amount of the target oil field under the condition of economic condition limitation, and 10 4m3.
② For a target oil field (N 1>N0>N2) with local encryption potential, calculating the lateral maximum work load N 3 under economic conditions using equation (10):
predicting the target oil field encryption accumulated oil increase amount by using the formula (11):
Rs＝n2·R2 (11)
The technical scheme of the invention is explained in detail below in connection with practical application.
The P oil field is positioned at the middle and south of the Bohai sea area, the average water depth is 27-33 m in the oil field range, the main force production layer is an explicit town and liberal pottery group, the reservoir burial depth is 1000-1400 m, the reservoir burial depth is longitudinally divided into 7 oil groups and 34 small layers, the longitudinal span reaches 400m, and the P oil field is a typical offshore thin interbedded sandstone oil field. The viscosity of the crude oil in the stratum gradually decreases along with the increase of the burial depth, the apparent town is common thickened oil (100-245 mpa.s), the librarian group is common crude oil (9-20 mpa.s), and the invention is described in detail below by taking a P oil field as an example:
The invention provides a quantitative evaluation method for encryption potential of a marine thin interbed sandstone oil field based on reserve quality difference, which comprises the following steps:
(1) The longitudinal 34 small layers of the P oil field are classified according to the quality dividing standard of the offshore thin interbed sandstone oil field reserves in the table 1, and the result is shown in the table 3.
TABLE 3P oilfield reservoir classification
(2) The reserve distribution conditions of different qualities of the P oil field are counted according to the reserve quality dividing standard of the offshore thin interbed sandstone oil field in table 2, and the results are shown in table 4.
TABLE 4P oilfield different quality reserves distribution
As can be seen from table 4, P oil field G12＝4158×104m3,G22＝2216×104m3,G32＝1221×104m3,G24＝1734×104m3, has no other quality reserves and takes a value of zero according to the reserve quality classification criteria.
(3) Aiming at the development characteristics of the thin interbed reservoir of the P oil field, the recovery ratio change rule of the P oil field is predicted by using a recovery ratio prediction model of the offshore thin interbed sandstone oil field.
① And (3) basic parameter statistics: the average effective permeability, the formation crude oil viscosity, the effective thickness and the sand spread width of different reserve qualities of the P oil field are counted, and the results are shown in tables 5-8.
TABLE 5P average effective permeability statistics for oilfield
TABLE 6P average formation crude oil viscosity statistics for oilfield
TABLE 7P statistical table of average effective thickness of oilfield
Table 8P statistical table of average sand spread width of oil field
As can be seen from tables 5 to 8, the P oil field K12＝350m,K22＝250m,K32＝200m,K24＝175m;H12＝350m,H22＝250m,H32＝200m,H24＝175m;μ12＝350m,μ22＝250m,μ32＝200m,μ24＝175m;d12＝350m,d22＝250m,d32＝200m,d24＝175m, has no other quality reserves and takes the value of zero.
② Establishing a P oilfield recovery ratio change chart: substituting the parameters into the utilization formulas (1) to (4) to predict the change rule of the recovery ratio of the P oil field, and further establishing a pattern of the recovery ratio of the P oil field along with the change of the injection and production well spacing (shown in figure 1).
(4) And establishing a single well cumulative oil increasing quantity prediction model of the offshore thin interbed sandstone oil field considering the reserve quality difference, and predicting Shan Jinglei oil increasing change rules in combination with the actual condition of the P oil field.
① The oil-containing area S=5.3 km 2 of the P oil field, and the oil-increasing amount change rule of the P oil field Shan Jinglei is predicted by using the formula (5) (shown in figure 2).
② Based on Shan Jinglei oil increase change rule prediction results, a change chart of the oil increase amount C o of the P oil field Shan Jinglei along with the well control reserves of the single well (shown in figure 3) is further established by using the formula (6).
(5) And qualitatively judging the encryption potential of the oil field according to the economic critical cumulative oil quantity of the P oil field development well and the side drilling single well by using a relation chart of the oil quantity of the P oil field Shan Jinglei and the well control oil quantity of the single well.
① The known oil quantity R 1 of the single-well economic critical cumulative oil quantity R3835=9.0 square and the oil quantity R 2 of the single-well economic critical cumulative oil quantity R 2 of the side drilling well are 6.0 square, namely the oil quantity of the P oil field development well Shan Jinglei is higher than 9 square to meet the economic requirement, and the method has practical value; the oil quantity of the side drilling Shan Jingzeng is higher than 6 thousands of people to meet the economic requirement, and the side drilling Shan Jingzeng has implementation value.
② And determining 9330 square meters of total reserves of the P oil field, 80 wells are produced in the current stage, and calculating N 0 = 96 square meters of single well control reserves of the P oil field in the current stage.
③ And cutting off the relation plate of Shan Jinglei oil increment and single well control reserves by utilizing the development well and side drilling single well critical accumulated oil increment R 1、R2, taking single well critical well control reserves N 1、N2 corresponding to two cut-off points, as shown in figure 3, N 1 =60 square, N 2 =50 square, and for P oil field N 0>N1>N2, so that P oil field encryption potential is large, and suggesting a newly built platform to carry out integral encryption.
(6) And determining the number of the target oil field encryption potential wells and the target oil enhancement amount according to the P oil field encryption potential condition.
Because of N 0>N1>N2, P oil field encryption potential is large. And calculating the maximum work amount of development wells and sidetracking wells under the condition of P oilfield economic conditions by using the difference values of the formula (7) and the formula (8), wherein n 1 = 39 ports and n 2 = 31 ports.
Predicting the maximum oil increment amount R s = 506 square under the limit of P oilfield economic conditions by using the formula (9), wherein the method comprises the following steps:
Rs＝n1·R1+n2·R2＝39×9+31×5＝506。
The method of the invention is applied to the field production of the Boyle 19-3 oil field group in the Bohai sea area. The Suaeda 19-3 oil field group is a typical offshore thin interbed sandstone oil field, the main force block oil-containing layer section is a Ming-Suaeda section and a Liu-Zhu group, the reservoir burying depth is 900-1400 m, the longitudinal span is 500m, the 13 oil groups are divided into 47 small layers, and the reservoir physical properties and the fluid properties of the small layers are greatly different. The oil field group main force block currently enters a later development stage, encryption and mining research is to be carried out urgently, the interlayer interference phenomenon is very serious due to the adoption of large-section combined mining development in the earlier stage, the new well drilling implementation effect is deteriorated year by year, and meanwhile, the encryption and mining scheme is high in investment cost and high in risk due to the limitation of well drilling conditions and engineering facility processing capacity, so that economic and effective development is difficult to realize. According to the method and the steps of the patent, the working of the rolling planning scheme of the Sualai 19-3 oilfield group area is completed, underground capacity and investment cost are considered, development wells and lateral drilling workload of the Sualai 19-3 oilfield group encryption and diving scheme are guided to be optimized, newly added development wells 173, lateral drilling 321 and newly added recoverable reserves 3483 are planned altogether. Meanwhile, the offshore thin interbed sandstone oil field has wide distribution range and large reserve ratio, is a main component for the domestic future output succession, and the method of the patent provides powerful technical support for the efficient development of the reserve of the offshore thin interbed sandstone oil field in the future and has wide application prospect.
The second aspect of the invention provides a quantitative evaluation device for encryption potential of a marine thin interbed sandstone oil field, which comprises:
The first processing unit is used for establishing a sea thin interbed sandstone oilfield reservoir type division standard according to reservoir development characteristics based on production practice, and determining the type of each longitudinal layer of the target oilfield;
The second processing unit is used for combining reservoir type division standards, establishing offshore thin interbed sandstone oil field reserve quality division standards according to the viscosity of underground crude oil, and determining different reserve quality conditions of a target oil field;
the third processing unit is used for establishing a recovery ratio prediction model of the offshore thin interbed sandstone oil field based on reserve quality according to the development characteristics of the offshore thin interbed sandstone oil field, predicting a target oil field recovery ratio change rule and forming a target oil field recovery ratio change chart;
The fourth processing unit is used for establishing a single well cumulative oil increasing quantity prediction model of the offshore thin interbed sandstone oil field considering the reserve quality difference, and forming a target oil field Shan Jinglei oil increasing quantity change chart by combining a target oil field actual condition prediction Shan Jinglei oil increasing change rule;
The fifth processing unit is used for qualitatively judging the encryption potential of the oil field according to the economic critical cumulative oil quantity of the single well of the development well and the sidetracking well of the target oil field by utilizing the target oil field single well cumulative oil quantity prediction model or the change plate;
and the sixth processing unit is used for determining the number of the target oil field encryption potential wells and the target oil increasing amount according to the target oil field encryption potential condition.
A third aspect of the present invention provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the above-described method for quantitatively evaluating encryption potential of an offshore thin interbed sandstone oilfield.
A fourth aspect of the present invention provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the above-described method for quantitatively evaluating the encryption potential of an offshore thin interbed sandstone oilfield when the computer program is executed.
The present invention is described in terms of flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments. It will be understood that each flowchart and/or block of the flowchart illustrations and/or block diagrams, and combinations of flowcharts and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. The quantitative evaluation method for the encryption potential of the offshore thin interbed sandstone oil field is characterized by comprising the following steps of:
Based on production practice, establishing a thin interbed sandstone oilfield reservoir type division standard at sea according to reservoir development characteristics, and determining the type of each longitudinal layer of a target oilfield;
Establishing offshore thin interbed sandstone oilfield reserves quality division standards according to the viscosity of underground crude oil by combining the reservoir type division standards, and determining different reserves quality conditions of a target oilfield;
According to the development characteristics of the offshore thin interbed sandstone oil field reservoir, establishing an offshore thin interbed sandstone oil field recovery ratio prediction model based on reserve quality, predicting a target oil field recovery ratio change rule, and forming a target oil field recovery ratio change pattern;
Establishing a single well cumulative oil increasing quantity prediction model of the offshore thin interbed sandstone oil field considering the reserve quality difference, and forming a target oil field Shan Jinglei oil increasing quantity change chart by combining a target oil field actual condition prediction Shan Jinglei oil increasing change rule;
Judging the encryption potential of the oil field qualitatively according to the economic critical cumulative oil quantity of the single well of the development well and the sidetracking well of the target oil field by using a target oil field single well cumulative oil quantity prediction model or a change plate;
Determining the number of wells with the encryption potential of the target oil field and the oil increasing amount of the target oil field according to the encryption potential of the target oil field;
The method for establishing the recovery ratio prediction model of the offshore thin interbed sandstone oil field based on reserve quality comprises the following steps:
（1）
Wherein E R is the offshore thin interbed sandstone oilfield recovery ratio; m is stratum coefficient; t is the injection and production efficiency coefficient; d is the injection well spacing; g is the geological reserve; i. j is a subscript symbol, a parameter with the subscript symbol indicates a parameter corresponding to reserve quality, and no subscript symbol indicates a parameter of a target oil field;
Establishing a single well cumulative oil increasing quantity prediction model of the offshore thin interbed sandstone oil field considering the reserve quality difference, and combining a target oil field actual condition prediction Shan Jinglei oil increasing change rule to form a target oil field Shan Jinglei oil increasing quantity change chart, wherein the method comprises the following steps of:
establishing a single well cumulative oil quantity prediction model by using the derivative of the formula (1):
（5）
Predicting the actual Shan Jinglei oil-increasing change rule of the target oil field according to the formula (5);
single well control reserves N of conventional drainage pattern and injection and production well spacing D:
（6）
wherein N is the well control reserve of a single well; s is the oil-containing area of the oil field; r is Shan Jinglei for increasing oil quantity;
Based on the prediction result of the formula (5), a change chart of the oil increasing amount C o of the target oil field Shan Jinglei along with the well control reserve of the single well is established by using the formula (6).
2. The quantitative evaluation method for encryption potential of the offshore thin interbed sandstone oil field according to claim 1, wherein based on production practice, the classification standard of the offshore thin interbed sandstone oil field reservoir types is established according to the development characteristics of the reservoir, and the types of the longitudinal layers of the target oil field are determined as follows:
Dividing the offshore thin interbed sandstone oil field into i types according to the spreading range of sand bodies, the effective thickness, the sand-to-ground ratio and the permeability, wherein i=1, 2 and 3; the effective thickness of the dominant layer in the marine thin interbedded sandstone oil field is large, the physical property is good, the plane spreading range of the sand body is large, and the sand body is divided into 1 types; the effective thickness of the thin difference layer is small, the physical property is poor, the plane spreading range of the sand body is limited, and the sand body is divided into 2 and 3 types.
3. The quantitative evaluation method for the encryption potential of the offshore thin interbed sandstone oil field according to claim 2, wherein the quality classification standard of the offshore thin interbed sandstone oil field is established according to the viscosity of underground crude oil in combination with the reservoir type classification standard, and different reserve quality conditions of a target oil field are determined, specifically as follows:
And determining the reserve scale G ij with different quality according to the reservoir type i to which the reserve belongs and the crude oil viscosity interval j to which the reserve belongs, so as to determine the quality conditions of different reserves of the target oil field.
4. The quantitative evaluation method for the encryption potential of the offshore thin interbed sandstone oil field, which is disclosed by claim 1, is characterized in that the encryption potential of the oil field is qualitatively judged according to the economic critical cumulative oil quantity of a single well of a target oil field development well and a side drilling well by utilizing a target oil field single well cumulative oil quantity prediction model or a change plate, and specifically comprises the following steps:
Determining the critical cumulative oil quantity R 1 of the development well and the critical cumulative oil quantity R 2 of the sidetracking well according to the actual condition of the target oil field; determining a single well control reserve N 0 of the target oil field at the current stage; intercepting a Shan Jinglei oil-increasing amount and single well control reserves relation chart by utilizing a development well and side drilling single well economic critical accumulated oil-increasing amount R 1、R2, taking single well critical well control reserves N 1、N2 corresponding to two intercepting points, and judging the encryption potential of a target oil field under the limit of economic conditions according to the relation between N 1、N2 and N 0:
a) When N 1>N2>N0 is adopted, the target oil field does not have encryption potential;
b) When N 0>N1>N2 is high, the encryption potential of the target oil field is high, and a newly built platform is recommended to carry out integral encryption;
c) When N 1>N0>N2, the target field encryption potential is small, it is recommended to consider using sidetracking well partial encryption.
5. The quantitative evaluation method for the encryption potential of the offshore thin interbed sandstone oil field, according to claim 4, is characterized in that the number of the encryption potential wells of the target oil field and the target oil enhancement amount are determined according to the encryption potential condition of the target oil field, and specifically comprises the following steps:
① For a target oil field with overall encryption potential, N 0>N1>N2, calculating the maximum workload of development wells and sidetracking wells under the allowable economic condition by using the difference value of the formula (7) and the formula (8) N 1、n2:
（7）
（8）
Predicting the target oil field encryption accumulated oil increase amount by using the formula (9):
（9）
Wherein n 1、n2 is the maximum workload of a development well and a sidetracking well under the condition of target oilfield economic conditions; r s is the maximum oil enhancement amount of the target oil field under the limit of economic conditions;
② For a target oilfield with local encryption potential, N 1>N0>N2, calculate the lateral maximum work load allowed under economic conditions N 3 using equation (10):
（10）
Predicting the target oil field encryption accumulated oil increase amount by using the formula (11):
（11）。
6. the utility model provides a marine thin interbed sandstone oil field encryption potentiality quantitative evaluation device which characterized in that includes:
The first processing unit is used for establishing a sea thin interbed sandstone oilfield reservoir type division standard according to reservoir development characteristics based on production practice, and determining the type of each longitudinal layer of the target oilfield;
The second processing unit is used for combining reservoir type division standards, establishing offshore thin interbed sandstone oil field reserve quality division standards according to the viscosity of underground crude oil, and determining different reserve quality conditions of a target oil field;
the third processing unit is used for establishing a recovery ratio prediction model of the offshore thin interbed sandstone oil field based on reserve quality according to the development characteristics of the offshore thin interbed sandstone oil field, predicting a target oil field recovery ratio change rule and forming a target oil field recovery ratio change chart;
The fourth processing unit is used for establishing a single well cumulative oil increasing quantity prediction model of the offshore thin interbed sandstone oil field considering the reserve quality difference, and forming a target oil field Shan Jinglei oil increasing quantity change chart by combining a target oil field actual condition prediction Shan Jinglei oil increasing change rule;
The fifth processing unit is used for qualitatively judging the encryption potential of the oil field according to the economic critical cumulative oil quantity of the single well of the development well and the sidetracking well of the target oil field by utilizing the target oil field single well cumulative oil quantity prediction model or the change plate;
The sixth processing unit is used for determining the number of wells with the encryption potential of the target oil field and the target oil increasing amount according to the encryption potential of the target oil field;
The method for establishing the recovery ratio prediction model of the offshore thin interbed sandstone oil field based on reserve quality comprises the following steps:
（1）
Wherein E R is the offshore thin interbed sandstone oilfield recovery ratio; m is stratum coefficient; t is the injection and production efficiency coefficient; d is the injection well spacing; g is the geological reserve; i. j is a subscript symbol, a parameter with the subscript symbol indicates a parameter corresponding to reserve quality, and no subscript symbol indicates a parameter of a target oil field;
Establishing a single well cumulative oil increasing quantity prediction model of the offshore thin interbed sandstone oil field considering the reserve quality difference, and combining a target oil field actual condition prediction Shan Jinglei oil increasing change rule to form a target oil field Shan Jinglei oil increasing quantity change chart, wherein the method comprises the following steps of:
establishing a single well cumulative oil quantity prediction model by using the derivative of the formula (1):
（5）
Predicting the actual Shan Jinglei oil-increasing change rule of the target oil field according to the formula (5);
single well control reserves N of conventional drainage pattern and injection and production well spacing D:
（6）
wherein N is the well control reserve of a single well; s is the oil-containing area of the oil field; r is Shan Jinglei for increasing oil quantity;
Based on the prediction result of the formula (5), a change chart of the oil increasing amount C o of the target oil field Shan Jinglei along with the well control reserve of the single well is established by using the formula (6).
7. A computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the steps of the offshore thin interbed sandstone oilfield encryption potential quantification evaluation method of any of claims 1-5.
8. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method for quantitatively evaluating the encryption potential of an offshore thin interbed sandstone field of any of claims 1-5 when the computer program is executed by the processor.
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