CN112465218B - Offshore thin interbed sandstone oilfield layer system division and perforation scheme optimization method - Google Patents
Offshore thin interbed sandstone oilfield layer system division and perforation scheme optimization method Download PDFInfo
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Abstract
The invention relates to a method for optimizing a marine thin interbed sandstone oilfield layer system division and perforation scheme, which comprises the following steps: 1) Establishing a small-layer dynamic injection-production communication degree evaluation flow applicable to the thin interbed sandstone oil field; 2) Quantitatively evaluating the longitudinal heterogeneous severity of the thin interbed sandstone oil field; 3) Establishing an interlayer interference coefficient quantitative prediction chart of a thin interbed sandstone oil field, and accurately predicting interlayer interference change rules of different water-containing stages of a target well; 4) Establishing a directional well energy production formula applicable to a thin interbed sandstone oilfield; 5) Aiming at the actual condition of a new zone development well, a layer system division scheme is optimized by utilizing a corrected directional well energy production formula, and productivity and development effects are predicted; 6) Aiming at the actual situation of the encrypting well in the old area, the perforation scheme is optimized by utilizing the corrected directional well energy production formula, and the productivity and the development effect are predicted. The method can effectively guide key works such as division of offshore thin interbed sandstone oilfield development layers, design of perforation methods and the like, and has small uncertainty.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas exploitation, in particular to a method for optimizing a marine thin interbedded sandstone oilfield layer system division and perforation scheme.
Background
The offshore thin interbed sandstone oil field has wide distribution range and large reserve ratio, is a main component part for taking over the future output in China, but the oil field adopts a development mode of large-section combined production of a directional well in the early development stage due to the limitation of development cost and economy. The reservoir characteristics of the thin interbed sandstone oil field are different from those of the conventional multilayer sandstone oil field, the number of small layers in the same oil group is more, the effective thickness is thin, the sand spreading range is small, the injection and production communication degrees of all small layers are different, meanwhile, the longitudinal span is large, the physical properties of the small layers and the difference of fluid are large, and a plurality of factors all cause the interlayer interference phenomenon in the actual production process of the thin interbed sandstone oil field to be very serious, so that the work of developing the layer system division, the perforation scheme design and the like is particularly critical. The conventional method is mostly aimed at the development of conventional sandstone oil fields, has single consideration factor and large research scale, is not suitable for the development of thin interbed sandstone oil fields, and has the problems of large uncertainty of initial development and later adjustment of offshore thin interbed sandstone oil fields caused by the lack of effective theoretical basis and technical support for the work of development layer system division, perforation scheme design and the like, and the production management level of the offshore thin interbed sandstone oil fields is always restricted.
Disclosure of Invention
Aiming at the problems, the invention aims to provide the optimization method for the offshore thin interbed sandstone oilfield layer system division and the perforation scheme, which can effectively guide key works such as the offshore thin interbed sandstone oilfield development layer system division and the perforation method design, and has small uncertainty.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention relates to a method for optimizing a marine thin interbed sandstone oilfield layer system division and perforation scheme, which is characterized by comprising the following steps:
1) Aiming at the reservoir development characteristics and development characteristics of the thin interbed sandstone oil field, a dynamic and static data combination method is adopted to establish a small-layer dynamic injection and production communication degree evaluation flow applicable to the thin interbed sandstone oil field;
2) Comprehensively considering reservoir physical properties, fluid properties and injection and production communication conditions of the thin interbed sandstone oil field, introducing the flowability and flowability level difference of each small layer, and quantitatively evaluating the longitudinal heterogeneous severity of the thin interbed sandstone oil field;
3) Based on production data statistics of typical oil fields, establishing an interlayer interference coefficient quantitative prediction chart of a thin interbed sandstone oil field, and accurately predicting interlayer interference change rules of different water-containing stages of a target well;
4) Aiming at the development characteristics of the thin interbed sandstone oil field reservoir, two parameters of interference coefficient and flow capacity are introduced to correct the traditional directional well energy production formula, and a directional well energy production formula suitable for the thin interbed sandstone oil field is established;
5) Aiming at the actual condition of a new zone development well, a layer system division scheme is optimized by utilizing a corrected directional well energy production formula, and productivity and development effects are predicted;
6) Aiming at the actual situation of the encrypting well in the old area, the perforation scheme is optimized by utilizing the corrected directional well energy production formula, and the productivity and the development effect are predicted.
In the above-mentioned optimization method for the layer system division and perforation scheme of the offshore thin interbed sandstone oil field, preferably, in the above-mentioned step 1), the dynamic injection and production communication rate of each small layer is calculated firstly by the formula (1), and then the injection and production communication condition of the small layer of the thin interbed sandstone oil field is evaluated by the dynamic injection and production communication rate of each small layer:
wherein T is i The dynamic injection and production communication rate of the ith small layer is dimensionless; h i communication The effective thickness of the ith small layer communicated with the water injection well; h i Total Is the total effective thickness of the ith minor layer; i is the small layer sequence number.
In the above-mentioned optimization method for offshore thin interbed sandstone oilfield layer system division and perforation scheme, preferably, in the above-mentioned step 2), the flow capacity of each small layer is obtained by using the formula (2):
wherein F is i Flow capability for the ith layer; k (K) i An effective permeability for the i-th minor layer; mu (mu) i Crude oil viscosity for the i-th small layer; h i Is the oil layer thickness of the i-th layer.
In the above-mentioned optimization method for offshore thin interbed sandstone oilfield layer system division and perforation scheme, preferably, in the above-mentioned step 2), the flow capacity level difference of each small layer is obtained by using the formula (3):
wherein R is the flow capacity level difference; f (F) max Is the maximum flow capacity;is the average flow capacity.
In the above-mentioned method for optimizing the layer system division and perforation scheme of the offshore thin interbed sandstone oil field, preferably, in the above-mentioned step 4), the directional well energy formula applicable to the thin interbed sandstone oil field is as follows:
wherein: q is the combined production yield; k (K) roi The relative permeability of the oil phase of the ith small layer under a certain water content; p is p e For the supply pressure; p is p wf Is the bottom hole flow pressure; b (B) oi The volume coefficient of crude oil of the ith small layer is dimensionless; r is (r) we Is the effective wellbore radius; r is R ev For the supply radius; s is the epidermis coefficient, dimensionless; alpha is interlayer dryA disturbance coefficient; f (f) wi The water content of the i-th layer was the same.
The method for optimizing the offshore thin interbed sandstone oilfield layer system division and perforation scheme preferably comprises the following substeps:
5.1 Step 5.4) according to the evaluation result of the small-well region small-layer flow capacity level difference in the step 2), primarily judging the necessity of layer division, and directly executing the step 5.4) for the same layer joint development of the small-layer division with the flow capacity level difference smaller than 5.0; for small layers with flow capacity level differences greater than 5.0, the development of layering system is suggested under the conditions of economy and process conditions, and step 5.2) is required to be executed;
5.2 Grading the small layers according to the respective flow capacities according to the actual conditions of the site, and noticing that the small layer flow grade difference of the same grade needs to be controlled within 5.0;
5.3 The combination schemes of small layers with different grades are designed, the small layer flow level difference in the same combination is controlled within 5.0, and the productivity condition of each scheme is predicted by utilizing the corrected directional well productivity formula;
5.4 A combination of economics and process level, an optimal layer-system combination scheme is determined.
The method for optimizing the offshore thin interbed sandstone oilfield layer system division and perforation scheme preferably comprises the following substeps:
and (3) preliminarily judging the necessity of layer division according to the evaluation result of the small-layer flow capacity level difference of the target well region in the step (2): for small layers with the flow capacity level difference less than 5.0, the same layer can be divided for combined production development, and different perforation schemes are designed mainly aiming at the flooding degree, and the specific steps are as follows:
6.1 Grading the small layers according to respective flooding degrees;
6.2 Designing perforation schemes of small layers with different flooding grades, and predicting initial water content of each scheme according to thickness weighting;
6.3 Predicting the productivity change rule of each perforation scheme by utilizing the corrected directional well productivity formula (4), cutting off the productivity curves according to the initial water content of each scheme, and determining the actual productivity curves of each scheme;
6.4 Comparing the productivity conditions of all the schemes, comprehensively considering the economy and the technological level, and determining an optimal perforation scheme;
for small layers with the flow capacity difference of more than 5.0, a reasonable perforation scheme is designed by considering the flow capacity difference and the flooding degree difference of the small layers, and the specific steps are as follows:
6.5 Grading the small layers according to the respective flow capacities according to the actual conditions of the site, and noticing that the small layer flow grade difference of the same grade needs to be controlled within 5.0;
6.6 The combination schemes of small layers with different grades are designed, and the small layer flow level difference in the same combination is controlled within 5.0;
6.7 Grading the small layers in the same combination according to respective flooding degrees, designing perforation schemes of the small layers with different flooding degrees in the same combination, and predicting initial water content of each scheme according to thickness weighting;
6.8 Predicting the productivity change rule of each perforation scheme by utilizing the corrected directional well productivity formula (4), cutting off the productivity curves according to the initial water content of each scheme, and determining the actual productivity curves of each scheme;
6.9 Comparing the productivity of each scheme, comprehensively considering the economy and the technological level, and determining the optimal perforation scheme.
Due to the adoption of the technical scheme, the invention has the following advantages:
the invention optimizes the perforation scheme of a thin interbed one-hole encryption well of the Suaei 19-3 oil field by being applied to the field production of the Suaei 19-3 oil field, and the well has the advantages that the yield is improved by about 30m3/d, the water content is reduced by about 15 percent, and the accumulated oil is increased by 2.0 square.
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 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.
Drawings
FIG. 1 is a flow chart of analysis of the communication conditions of dynamic injection and production of small layers of a thin interbed sandstone oilfield;
FIG. 2 is a diagram of quantitative prediction graph of interlayer interference coefficient of a thin interbed sandstone oilfield;
FIG. 3 is a graph showing the prediction result of A-01 well region disturbance factor;
FIG. 4 is a graph showing the prediction of A-01 well productivity;
FIG. 5 is a flow chart for optimizing a thin interbed sandstone oilfield new zone development well layer system partitioning scheme;
FIG. 6 is a flowchart of optimization of a thin interbed sandstone oilfield land encryption well perforation scheme;
FIG. 7 is a graph of the productivity of different perforation schemes for the A-01 well.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the attached drawings, so that the objects, features and advantages of the present invention will be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the invention, but rather are merely illustrative of the true spirit of the invention.
The present invention is described in detail below in connection with a typical well example (A-01).
The invention provides a method for optimizing a marine thin interbed sandstone oilfield layer system division and perforation scheme, which comprises the following steps:
1) Aiming at the reservoir development characteristics and development characteristics of the thin interbed sandstone oil field, a dynamic and static data combination method is adopted to establish a small-layer dynamic injection and production communication degree evaluation flow applicable to the thin interbed sandstone oil field;
and analyzing the dynamic communication state of the small layer of the A-01 well region according to the flow of the figure 1 by using the flooding degree of the small layer, MDT pressure measurement data, PLT test data and production dynamic data according to the development state of the reservoir.
Firstly, calculating the dynamic injection and production communication rate of each small layer through a formula (1), and then evaluating the injection and production communication condition of each small layer of the thin interbed sandstone oil field through the dynamic injection and production communication rate of each small layer:
wherein T is i The dynamic injection and production communication rate of the ith small layer is dimensionless; h i communication The effective thickness of the ith small layer communicated with the water injection well; h i Total Is the total effective thickness of the ith minor layer; i is the small layer sequence number. The specific calculation results are shown in Table 1:
TABLE 1A-01 well dynamic injection and production communication rate table
2) Comprehensively considering reservoir physical properties, fluid properties and injection and production communication conditions of the thin interbed sandstone oil field, introducing key parameters of flowability and flowability level difference of each small layer, and quantitatively evaluating the longitudinal heterogeneous severity of the thin interbed sandstone oil field;
the different small layers have different flowing capacities, the dominant layer with strong flowing capacity has small flowing resistance and small pressure drop, and a high-pressure system is easy to form, so that the liquid production contribution rate and the reserve utilization degree of the non-dominant layer with weak flowing capacity are inhibited. Meanwhile, due to the influence of different flow capacities and liquid production speeds among the small layers, the dominant horizon with strong flow capacity and large liquid production contribution has faster water rising, otherwise, the non-dominant horizon has slower water rising, the difference of the water rising speeds aggravates the flow capacity difference among the small layers, and the most visual manifestation is that the yield contribution rate and reserve utilization condition of the non-dominant horizon are worse along with the water rising, namely the interlayer interference effect is worse. Therefore, the inter-layer interference action law should be related to the absolute flow capacity difference between the small layers, such as the permeability, effective thickness, fluid viscosity and injection and production communication degree of the small layers, and the relative flow capacity difference between the small layers, such as the water-containing stage and oil-water infiltration.
However, the reservoir characteristics of the thin interbed sandstone oil field are different from those of the conventional multilayer sandstone oil field, the number of small layers in the same oil group is more, the effective thickness is thin, the sand spreading range is small, the injection and production communication degrees of the small layers are different, meanwhile, the longitudinal span is large, the physical properties of the small layers and the difference of fluids are large, and the interlayer interference phenomenon in the actual production process of the thin interbed sandstone oil field is very serious due to various factors.
In order to more comprehensively consider the influence of the factors on the interlayer interference phenomenon, the flow capacity concept is introduced for the first time, the flow capacity of each small layer can be calculated according to the formula (2), the parameters comprehensively consider the permeability, the effective thickness, the fluid viscosity and the injection-production communication degree of the small layers, the difference between the small layers is more comprehensively described, and the interlayer heterogeneous condition of the thin interbed oil reservoir can be more accurately evaluated.
According to the dynamic and static data of the A-01 well region, the flow capacity of each small layer is obtained through a formula (2):
wherein F is i Flow capability for the ith layer; k (K) i An effective permeability for the i-th minor layer; mu (mu) i Crude oil viscosity for the i-th small layer; h i The thickness of the oil layer is the i-th small layer; t (T) i And the dynamic injection and production communication rate of the ith small layer. The calculation results are shown in Table 2:
TABLE 2A-01 well flow Capacity Meter
To more fully describe the flow capacity differences between the thin layers, the flow capacity differences of the longitudinal small layers are calculated according to the formula (3) and serve as main indexes for measuring the absolute flow capacity of the reservoir and the absolute flow capacity difference degree between the thin layers.
From the calculation results of Table 2, the A-01 well flow capacity differential is obtained by equation (3) as:
wherein R is the flow capacity level difference; f (F) max Is the maximum flow capacity;is the average flow capacity.
3) Based on mass production data statistics of a typical oil field, establishing a quantitative prediction chart of the interlayer interference coefficient of the thin interbed sandstone oil field, and accurately predicting the interlayer interference change rules of different water-containing stages of a target well as shown in fig. 2;
and (3) counting production dynamic data of more than 50 typical wells in an actual oil field, determining the change rule of the interlayer interference coefficient with the water content under different flow capacity level differences through correlation analysis, and establishing a quantitative prediction chart of the interlayer interference coefficient of the thin interbed sandstone oil field by adopting a multi-fitting method. According to the capability level difference of each small layer of the target well region, the change rule of the interlayer interference coefficient of the target well along with the water content can be accurately predicted by using the plate.
According to the flow capacity level difference condition of the A-01 well region in the step 2), predicting the change rule of the interlayer interference coefficient of the A-01 well region along with the water content by means of an interlayer interference coefficient quantitative prediction plate (figure 2), and the result is shown in figure 3.
4) Aiming at the development characteristics of the reservoir of the thin interbed sandstone oil field, two parameters of interference coefficient and flowing capacity are introduced to correct the traditional directional well energy production formula, a directional well energy production formula suitable for the thin interbed sandstone oil field is established, and the productivity prediction precision is greatly improved; the directional well energy production formula applicable to the thin interbed sandstone oil field is as follows:
wherein: q is the combined production yield; k (K) roi The relative permeability of the oil phase of the ith small layer under a certain water content; f (F) i Flow capability for the ith layer; p is p e For the supply pressure; p is p wf Is the bottom hole flow pressure; b (B) oi The volume coefficient of crude oil of the ith small layer is dimensionless; r is (r) we Is the effective wellbore radius; r is R ev For the supply radius; s is the epidermis coefficient, dimensionless; i is a small layer sequence number; alpha is an interlayer interference coefficient; f (f) wi The water content of the i-th layer was the same.
Substituting the result of the interference coefficient obtained from fig. 3 into formula (4), calculating the change condition of the productivity of the a-01 well along with the water content, and the calculation result is shown in fig. 4.
5) Aiming at the actual condition of a new zone development well, a layer system division scheme is optimized by utilizing a corrected directional well energy production formula, and productivity and development effects are predicted; the method specifically comprises the following steps of
5.1 Step 5.4) according to the evaluation result of the small-well region small-layer flow capacity level difference in the step 2), primarily judging the necessity of layer division, and directly executing the step 5.4) for the same layer joint development of the small-layer division with the flow capacity level difference smaller than 5.0; for small layers with flow capacity level differences greater than 5.0, the development of layering system is suggested under the conditions of economy and process conditions, and step 5.2) is required to be executed;
5.2 Grading the small layers according to the respective flow capacities according to the actual conditions of the site, and noticing that the small layer flow grade difference of the same grade needs to be controlled within 5.0;
5.3 The combination schemes of small layers with different grades are designed, the small layer flow level difference in the same combination is controlled within 5.0, and the productivity condition of each scheme is predicted by utilizing the corrected directional well productivity formula;
5.4 A combination of economics and process level, an optimal layer-system combination scheme is determined.
Step 5) is developed mainly for the design work of the layer-system division scheme of the new zone development well. For a new area development well, the flooding degree of each layer is relatively weak, and differences of the permeability, the effective thickness, the fluid viscosity and the injection-production communication degree of each small layer are mainly considered when the development layers are divided. The specific operation flow is shown in fig. 5.
6) Aiming at the actual situation of the encrypting well in the old area, the perforation scheme is optimized by utilizing the corrected directional well energy production formula, and the productivity and the development effect are predicted. Specifically, two cases are:
and (3) preliminarily judging the necessity of layer division according to the evaluation result of the small-layer flow capacity level difference of the target well region in the step (2): for small layers with the flow capacity level difference less than 5.0, the same layer can be divided for combined production development, and different perforation schemes are designed mainly aiming at the flooding degree, and the specific steps are as follows:
6.1 Grading the small layers according to respective flooding degrees;
6.2 Designing perforation schemes of small layers with different flooding grades, and predicting initial water content of each scheme according to thickness weighting;
6.3 Predicting the productivity change rule of each perforation scheme by utilizing the corrected directional well productivity formula (4), cutting off the productivity curves according to the initial water content of each scheme, and determining the actual productivity curves of each scheme;
6.4 Comparing the productivity of each scheme, comprehensively considering the economy and the technological level, and determining the optimal perforation scheme.
For small layers with the flow capacity difference of more than 5.0, a reasonable perforation scheme is designed by considering the flow capacity difference and the flooding degree difference of the small layers, and the specific steps are as follows:
6.5 Grading the small layers according to the respective flow capacities according to the actual conditions of the site, and noticing that the small layer flow grade difference of the same grade needs to be controlled within 5.0;
6.6 The combination schemes of small layers with different grades are designed, and the small layer flow level difference in the same combination is controlled within 5.0;
6.7 Grading the small layers in the same combination according to respective flooding degrees, designing perforation schemes of the small layers with different flooding degrees in the same combination, and predicting initial water content of each scheme according to thickness weighting;
6.8 Predicting the productivity change rule of each perforation scheme by utilizing the corrected directional well productivity formula (4), cutting off the productivity curves according to the initial water content of each scheme, and determining the actual productivity curves of each scheme;
6.9 Comparing the productivity of each scheme, comprehensively considering the economy and the technological level, and determining the optimal perforation scheme.
Step 6) mainly aiming at the perforation scheme design work development of the old area encryption well. For the encryption wells in the old area, the long-term exploitation leads to different degrees of flooding of each small layer, so that the perforation optimization needs to consider the difference condition of the flooding degrees of the small layers while considering the difference of the small layer flow capacity. The specific operation flow is shown in fig. 6.
Because the A-01 well is an encrypted well of the old area, the perforation optimization needs to consider the difference of the flooding degree of the small layer while considering the difference of the capacity of the small layer.
(1) According to the evaluation result of the small laminar flow capacity level difference of the target well region in the step 2), preliminarily judging that the small laminar flow capacity level difference of each small laminar flow capacity level difference of the A-01 well region is smaller than 5.0, and dividing the same layer of co-production development;
(2) counting the current flooding degree of each small layer of the A-01 well region, finding that the flooding conditions of the small layers of the A-01 well region are different obviously, and dividing the small layers into three grades I to III according to the flooding degree of each small layer (table 3);
TABLE 3A-01 well flooding degree table
(3) According to the small-layer flooding grade, 3 sets of layer system division schemes are designed, namely full perforation, an anti-jet type I flooding layer and an anti-jet type I+II flooding layer, and initial water content of each scheme is predicted according to thickness weighted average (table 4).
(4) Predicting the productivity change rule of each perforation scheme by using the corrected directional well productivity formula (4), cutting off the productivity curve according to the initial water content of each scheme, and determining the initial productivity (table 4) and the productivity change curve (fig. 7) of each scheme;
TABLE 4 prediction results of initial moisture content for different perforation schemes
(5) And comparing productivity conditions of all the schemes, comprehensively considering economy and technological level, and determining the optimal perforation scheme as an 'avoiding I-type flooding layer'.
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 (6)
1. The method for optimizing the offshore thin interbed sandstone oilfield layer system division and perforation scheme is characterized by comprising the following steps of:
1) Aiming at the reservoir development characteristics and development characteristics of the thin interbed sandstone oil field, a dynamic and static data combination method is adopted to establish a small-layer dynamic injection and production communication degree evaluation flow applicable to the thin interbed sandstone oil field;
2) Comprehensively considering reservoir physical properties, fluid properties and injection and production communication conditions of the thin interbed sandstone oil field, introducing the flowability and flowability level difference of each small layer, and quantitatively evaluating the longitudinal heterogeneous severity of the thin interbed sandstone oil field;
3) Based on production data statistics of typical oil fields, establishing an interlayer interference coefficient quantitative prediction chart of a thin interbed sandstone oil field, and accurately predicting interlayer interference change rules of different water-containing stages of a target well;
4) Aiming at the development characteristics of the thin interbed sandstone oil field reservoir, two parameters of interference coefficient and flow capacity are introduced to correct the traditional directional well energy production formula, and a directional well energy production formula suitable for the thin interbed sandstone oil field is established;
5) Aiming at the actual condition of a new zone development well, a layer system division scheme is optimized by utilizing a corrected directional well energy production formula, and productivity and development effects are predicted;
said step 5) comprises the following sub-steps:
5.1 Step 5.4) according to the evaluation result of the small-well region small-layer flow capacity level difference in the step 2), primarily judging the necessity of layer division, and directly executing the step 5.4) for the same layer joint development of the small-layer division with the flow capacity level difference smaller than 5.0; for small layers with flow capacity level differences greater than 5.0, the development of layering system is suggested under the conditions of economy and process conditions, and step 5.2) is required to be executed;
5.2 Grading the small layers according to the respective flow capacities according to the actual conditions of the site, and noticing that the small layer flow grade difference of the same grade needs to be controlled within 5.0;
5.3 The combination schemes of small layers with different grades are designed, the small layer flow level difference in the same combination is controlled within 5.0, and the productivity condition of each scheme is predicted by utilizing the corrected directional well productivity formula;
5.4 Determining an optimal layer-system combination scheme by comprehensively considering economy and process level;
6) Aiming at the actual situation of the encrypting well in the old area, the perforation scheme is optimized by utilizing the corrected directional well energy production formula, and the productivity and the development effect are predicted.
2. The method for optimizing the layer system division and perforation scheme of the offshore thin interbed sandstone oil field of claim 1, wherein in the step 1), the dynamic injection and production communication rate of each small layer is calculated firstly by the formula (1), and then the injection and production communication condition of the small layers of the thin interbed sandstone oil field is evaluated by the dynamic injection and production communication rate of each small layer:
wherein T is i The dynamic injection and production communication rate of the ith small layer is dimensionless; h i communication The effective thickness of the ith small layer communicated with the water injection well; h i Total Is the total effective thickness of the ith minor layer; i is the small layer sequence number.
3. The method for optimizing the layer system division and perforation scheme of the offshore thin interbed sandstone oilfield of claim 2, wherein in the step 2), the flow capacity of each small layer is obtained by the formula (2):
wherein F is i Flow capability for the ith layer; k (K) i An effective permeability for the i-th minor layer; mu (mu) i Crude oil viscosity for the i-th small layer; h i Is the oil layer thickness of the i-th layer.
4. The method for optimizing the layer system division and perforation scheme of the offshore thin interbed sandstone oilfield of claim 3, wherein in the step 2), the flow capacity level difference of each small layer is obtained by the formula (3):
wherein R is the flow capacity level difference; f (F) max Is the maximum flow capacity;is the average flow capacity.
5. The method for optimizing the layer system division and perforation scheme of the offshore thin interbed sandstone oilfield of claim 4, wherein in the step 4), the directional well energy formula applicable to the thin interbed sandstone oilfield is:
wherein: q is the combined production yield; k (K) roi The relative permeability of the oil phase of the ith small layer under a certain water content; p is p e For the supply pressure; p is p wf Is the bottom hole flow pressure; b (B) oi The volume coefficient of crude oil of the ith small layer is dimensionless; r is (r) we Is the effective wellbore radius; r is R ev For the supply radius; s is the epidermis coefficient, dimensionless; alpha is an interlayer interference coefficient; f (f) wi The water content of the i-th layer was the same.
6. The method for optimizing the offshore thin interbed sandstone oilfield layer system of claim 5, wherein the step 6) comprises the sub-steps of:
and (3) preliminarily judging the necessity of layer division according to the evaluation result of the small-layer flow capacity level difference of the target well region in the step (2): for small layers with the flow capacity level difference less than 5.0, the same layer can be divided for combined production development, and different perforation schemes are designed mainly aiming at the flooding degree, and the specific steps are as follows:
6.1 Grading the small layers according to respective flooding degrees;
6.2 Designing perforation schemes of small layers with different flooding grades, and predicting initial water content of each scheme according to thickness weighting;
6.3 Predicting the productivity change rule of each perforation scheme by utilizing the corrected directional well productivity formula (4), cutting off the productivity curves according to the initial water content of each scheme, and determining the actual productivity curves of each scheme;
6.4 Comparing the productivity conditions of all the schemes, comprehensively considering the economy and the technological level, and determining an optimal perforation scheme;
for small layers with the flow capacity difference of more than 5.0, a reasonable perforation scheme is designed by considering the flow capacity difference and the flooding degree difference of the small layers, and the specific steps are as follows:
6.5 Grading the small layers according to the respective flow capacities according to the actual conditions of the site, and noticing that the small layer flow grade difference of the same grade needs to be controlled within 5.0;
6.6 The combination schemes of small layers with different grades are designed, and the small layer flow level difference in the same combination is controlled within 5.0;
6.7 Grading the small layers in the same combination according to respective flooding degrees, designing perforation schemes of the small layers with different flooding degrees in the same combination, and predicting initial water content of each scheme according to thickness weighting;
6.8 Predicting the productivity change rule of each perforation scheme by utilizing the corrected directional well productivity formula (4), cutting off the productivity curves according to the initial water content of each scheme, and determining the actual productivity curves of each scheme;
6.9 Comparing the productivity of each scheme, comprehensively considering the economy and the technological level, and determining the optimal perforation scheme.
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