CN110344795B - Method for evaluating applicability of polymer flooding and well pattern encryption combined development mode - Google Patents
Method for evaluating applicability of polymer flooding and well pattern encryption combined development mode Download PDFInfo
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- 229920000642 polymer Polymers 0.000 title claims abstract description 104
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- 238000004519 manufacturing process Methods 0.000 claims abstract description 27
- 238000011156 evaluation Methods 0.000 claims abstract description 26
- 238000011234 economic evaluation Methods 0.000 claims abstract description 24
- 239000003921 oil Substances 0.000 claims description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 62
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- 238000002347 injection Methods 0.000 claims description 15
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- 238000004088 simulation Methods 0.000 claims description 13
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- 238000006116 polymerization reaction Methods 0.000 claims description 5
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Abstract
The invention relates to a method for evaluating the applicability of a polymer flooding and well pattern encryption combined development mode, which is characterized by comprising the following steps of: s1, establishing a polymer flooding and well pattern encryption combined economic evaluation model; s2, carrying out technical evaluation on different combination modes of polymer flooding and well pattern encryption; s3, carrying out economic evaluation on the polymer flooding and well pattern encryption in different combination modes according to the economic evaluation model to obtain the oil price application ranges of different combination modes; and S4, grading and evaluating the oil prices of different combination modes of polymer flooding and well pattern encryption based on different injection-production corresponding rates and well pattern density influences. The invention provides an oil price applicability evaluation method for different polymer flooding and well pattern encryption combined development modes, provides a basis for determining a reasonable development mode, and further improves the oil field development benefit.
Description
Technical Field
The invention relates to a method for evaluating the applicability of a polymer flooding and well pattern encryption combined development mode, and relates to the technical field of petroleum development.
Background
Polymer flooding technology has been widely used in many oil fields on a large scale as an important means for increasing the recovery efficiency. The structural complex polymer represented by the hydrophobic association type polymer is already applied to a part of heavy oil reservoirs in Bohai areas in China, and the polymer shows good adaptability and obtains a good exploitation effect. The offshore polymer flooding oilfield is mostly mined by adopting a reverse nine-point well pattern at the initial stage, at present, an encryption mode of row-shaped water injection is adopted, and meanwhile, a part of areas are accompanied with polymer flooding.
The onshore oil field has a large amount of experience which can be used for reference in the encryption process, the offshore oil field is influenced by factors such as development environment, platform service life, economy and the like, and most offshore oil fields are in the early stage of development, so that the experience which can be used for reference is less. The effectiveness of offshore oilfield polymer flooding and pattern encryption depends on many factors, such as pattern formation, encryption, combination of polymer flooding and encryption, etc. And polymer flooding and well pattern encryption are carried out simultaneously, the interaction mechanism of the polymer flooding and the well pattern encryption is not clearly researched, and a method for evaluating the oil price applicability of a polymer flooding and well pattern encryption combined development mode is needed to be established so as to analyze the effects of different polymer flooding and well pattern encryption combined development modes.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a method for evaluating the applicability of a polymer flooding and well pattern encryption combined development mode, which can improve the development benefit of an oil field.
In order to achieve the purpose, the invention adopts the following technical scheme: the invention provides a method for evaluating the applicability of a polymer flooding and well pattern encryption combined development mode, which comprises the following steps:
s1, establishing a polymer flooding and well pattern encryption combined economic evaluation model;
s2, carrying out technical evaluation on different combination modes of polymer flooding and well pattern encryption;
s3, carrying out economic evaluation on the polymer flooding and well pattern encryption in different combination modes according to the economic evaluation model to obtain the oil price application ranges of different combination modes;
and S4, grading and evaluating the oil prices of different combination modes of polymer flooding and well pattern encryption based on different injection-production corresponding rates and well pattern density influences.
Further, the process of establishing the polymer flooding and well pattern encryption combined economic evaluation model comprises the following steps:
calculating annual cash inflow:
CI＝α×Qoi×P0
in the formula, QoiM is annual oil production3；PoIs the crude oil price, yuan/m3(ii) a Alpha is the commodity rate of crude oil,%;
calculating annual cash outflow:
CO＝Co+Cr
in the formula, CoThe operation cost of crude oil is low; crIs tax, dollar, wherein the crude oil operating cost includes the square oil operating cost, water injection and polymer injection cost:
Co＝QoiCm+QwiPw+QpiPp
in the formula, CmFor each oil production operating cost, Yuan/m3；QwiM is the annual water injection amount3；PwFor the cost of water injection, Yuan/m3；QpiThe annual amount of polymerization, t; ppIs the polymer price, m/t;
the tax is replaced by two parts of comprehensive tax rate and resource tax:
Cr＝α×Qoi×Po×(R+Rs) (4)
in the formula, R is the comprehensive tax rate,%; rsResource tax rate,%;
calculating the dispersion cost:
the discrete cost is the cost generated in the current year by initial drilling investment, well pattern encryption and polymerization flooding measure adjustment:
in the formula, n1The number and the mouth of the basic well pattern wells; n is2Increasing the number of newly added wells for well pattern encryption; d is the well depth of completion, m; pdIs unit footage cost, yuan/m; i is1sThe average single well ground base investment is calculated; i is2sThe polymer flooding average single well increases investment, unit/port; vr1The present value, Yuan/Yuan of the average single-well ground equipment residual value at the end of the original well network exploitation period; vr2The method is characterized in that the method is a simple method for calculating the average single-well ground equipment residual value at the end of a new well exploitation period; t is t1Switching the time of polymer flooding for years; t is t2To encrypt opportunity, year, IcA baseline rate of return;
the economic evaluation model established by the fourth step is as follows:
in the formula, the coefficients A, B, C all take the value 0 or 1, and different value combinations respectively represent different displacement modes.
Further, the technical evaluation of different combination modes of polymer flooding and well pattern encryption is as follows:
firstly, establishing a typical well group digital-analog simulation model according to the target oil reservoir stratum structure, the oil reservoir type, the reservoir characteristics, the fluid property, the oil reservoir pressure and the temperature;
fitting the model history to obtain the water content of the whole area meeting the fitting requirement;
simulating different combination modes to obtain the recovery ratio conditions of the different combination modes;
and fourthly, evaluating the technical scheme of different combined modes.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the invention provides an oil price applicability evaluation method for different polymer flooding and well pattern encryption combined development modes, provides a basis for determining a reasonable development mode, and further improves the development benefit of an oil field;
2. the invention selects the polymer flooding and well pattern encryption combined development mode by taking the oil price as a basic evaluation parameter, and is visual and easy to operate;
in conclusion, the method can be widely applied to the evaluation of the adaptability of the polymer flooding and well pattern encryption combined development mode under the conditions of different well pattern well distances such as a nine-point well pattern, a five-point well pattern, a line-row well pattern and the like, and the application range is wide.
Drawings
FIG. 1 is a flow chart of a method for evaluating the applicability of a polymer flooding and well pattern encryption combined development mode of the invention;
FIG. 2 is a schematic illustration of the viscosity concentration curve of a polymer solution according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of fitting of the synthetic water content in the simulation area according to the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in FIG. 1, the utility degree evaluation method of the polymer flooding and well pattern encryption combined development mode provided by the invention comprises the following steps:
1. and constructing a polymer flooding and well pattern encryption combined economic evaluation model. Specifically, the polymer flooding and well pattern encryption combined economic evaluation model is established according to the following assumed conditions:
the cash flow only considers 3 items of investment, production cost and tax.
Secondly, the investment cost considers the drilling cost, the fixed asset investment of the encryption of the conversion well pattern and the increase of the polymer flooding, and only the year of the adjustment of the measure occurs.
And the polymer flooding production cost comprises 19 items of polymer cost, chemical agent cost, material cost, power cost, fuel cost, helicopter cost, supply ship leasing cost, communication weather service cost, injection agent repairing cost, personnel cost, welfare cost, oil well operation cost, mining area use cost, oil and gas treatment cost, management cost, financial cost, oil field research cost, sea insurance cost, sea area use cost and other exploitation cost. The proportion of the polymer cost is large, the calculation is carried out according to the actual injected polymer amount, and the other 18 items of cost are calculated according to the actual generation cost and the oil yield sharing.
The tax fee includes resource tax, value-added tax, city building tax, education additional tax and income tax. Value-added taxes, city construction taxes, education additional tax taxes and income taxes are replaced by the comprehensive tax rate counted in recent years of the oil field.
Fifthly, adopting a 8-year linear depreciation method for depreciation of the fixed assets.
Because the offshore oil field development cost is high, the rapid exploitation can generate certain benefits in time, a net present value method is selected for economic evaluation, and the process of establishing the polymer flooding and well pattern encryption combined economic evaluation model is as follows:
calculating an annual cash inflow, wherein the annual cash inflow mainly comes from the cost generated by the sale of crude oil commodities:
CI＝α×Qoi×P0 (1)
in the formula, QoiM is annual oil production3；PoIs the crude oil price, yuan/m3(ii) a Alpha is the commodity rate of crude oil,%.
Calculating annual cash outflow, wherein the annual cash outflow comprises operating cost and tax of producing crude oil:
CO＝Co+Cr (2)
in the formula, CoThe operation cost of crude oil is low; crIs tax and dollar.
Wherein, the crude oil operation cost mainly comprises the following cost:
Co＝QoiCm+QwiPw+QpiPp (3)
in the formula, CmFor each oil production operating cost, Yuan/m3；QwiM is the annual water injection amount3；PwFor the cost of water injection, Yuan/m3；QpiThe annual amount of polymerization, t; ppIs the polymer price, unit/t.
The tax is mainly replaced by two parts of comprehensive tax rate and resource tax:
Cr＝α×Qoi×Po×(R+Rs) (4)
in the formula, R is the comprehensive tax rate,%; rsIs the resource tax rate,%.
Calculating the discrete cost
The later enhanced recovery development effect is well pattern encryption and polymer flooding, assuming that the basic investment mainly occurs in the first year, so the discrete cost is mainly the initial drilling investment, well pattern encryption and polymer flooding measures to adjust the cost generated in the current year:
in the formula, n1The number and the mouth of the basic well pattern wells; n is2Increasing the number of newly added wells for well pattern encryption; d is the well depth of completion, m; pdIs unit footage cost, yuan/m; i is1sThe average single well ground base investment is calculated; i is2sThe polymer flooding average single well increases investment, unit/port; vr1The present value, Yuan/Yuan of the average single-well ground equipment residual value at the end of the original well network exploitation period; vr2The method is characterized in that the method is a simple method for calculating the average single-well ground equipment residual value at the end of a new well exploitation period; t is t1Switching the time of polymer flooding for years; t is t2To encrypt opportunity, year, IcA baseline rate of return.
The economic evaluation model established by the fourth step is as follows:
the formula (6) is a general formula for economic evaluation of water flooding, water flooding well pattern encryption, water flooding polymer flooding and water flooding encrypted polymer, wherein coefficients A, B, C all take values of 0 or 1, and different value combinations respectively represent different displacement modes, which is specifically shown in table 1.
TABLE 1 values of coefficients A, B, C for different take-over modes after water flooding
| Coefficient of performance | FoundationWater drive | Encrypted water drive | Polymer flooding | Encrypted |
| A | ||||
| 0 | 0 | 1 | 1 | |
| |
0 | 1 | 0 | 1 |
| |
0 | 0 | 0 | 1 |
2. Polymer flooding and well pattern encryption different combination mode technical evaluation are carried out to obtain the recovery ratio of different combination modes, and the specific process is as follows:
firstly, establishing a typical numerical simulation model, namely establishing a typical well group digital-analog simulation model according to the target oil reservoir stratum structure, the oil reservoir type, the reservoir characteristics, the fluid property, the oil reservoir pressure and the temperature, wherein the specific process comprises the following steps:
preparing data: basic information of simulation work, including black oil simulation, grid type, fluid information and oil field development time; reservoir models including grid size, grid top and bottom depth, porosity, permeability, net-to-gross); fluid PVT properties including oil/gas/water surface density, volume coefficient, dissolved gas-oil ratio, viscosity, concentration, compressibility; rock properties including a facies permeability curve, a capillary pressure curve; setting oil reservoir zones; initializing calculation parameters including model reference depth, initial pressure corresponding to the reference depth and oil/gas-water interface; outputting control parameters including oil/gas/water yield change curves and pressure change curves of oil fields and single wells; production parameters, including production or injection history of the well;
and inputting the data into commercial digital eclipse software to complete model building.
And fitting the model history to obtain the water content of the whole region meeting the fitting requirement.
According to actual production data (the actual production data comprises oil, gas and water) of a target block (an oil field block to be researched), typical model production data are assigned, model fitting is carried out, namely, adjustable parameters such as permeability, rock compression coefficient, phase permeation curve and oil/gas-water interface of the model are adjusted, the fitting index is mainly the water content of the whole region, and the error between the fitting water content curve and the water content of the actual block is within 10%, so that the fitting requirement is met.
Thirdly, simulating different combination modes to obtain the recovery ratio of the different combination modes
According to the characteristics of the existing polymer flooding and well pattern encryption combined development, five combined modes of basic water flooding, water flooding + polymer flooding, water flooding + encryption water flooding, water flooding + encryption + polymer flooding, water flooding + polymer flooding + encryption, water flooding + encryption polymer flooding and encryption polymer flooding are designed, under each development mode, the water content of the different substitution modes is 70% at the substitution time, for example, in the water flooding + encryption + polymer flooding mode, when the water content of the basic water flooding is 70%, encryption water flooding is carried out, when the water content rises to 70% again, polymer flooding is carried out, when the water content rises to 70%, subsequent water flooding is carried out, and injection-production balance is kept in the process of each development mode.
Fourthly, technical evaluation of different combination mode schemes
According to the simulation result, the recovery ratio of different combined modes is compared, and the higher the recovery ratio is, the better the development effect is.
3. Carrying out economic evaluation on the polymer flooding and well pattern encryption in different combination modes according to the established economic evaluation model;
and (3) calculating net present values of different schemes by using the economic evaluation model in the step 1, wherein the net present value is greater than 0 and represents profit, the net present value is less than 0 and represents no profit, and the higher the net present value is, the better the development effect is. And obtaining oil price limits of different combination modes according to the oil price points with the same net present value of different combination modes, and further obtaining the oil price application ranges of different combination modes.
4. And (4) carrying out grading evaluation on oil prices of different combination modes of polymer flooding and well pattern encryption based on the influences of different injection-production corresponding rates and well pattern density.
And (4) repeating the steps 2-3 according to different well pattern densities to obtain oil price grading evaluation of different combination modes of polymer flooding and well pattern encryption under the influence of different well pattern densities.
The specific application of the adaptation degree evaluation method of the polymer flooding and well pattern encryption combined development mode is described in detail below by using a specific embodiment, which is analyzed according to the actual conditions of the oil field in Bohai sea A, and the specific process is as follows:
1. and establishing a polymer flooding and well pattern encryption combined economic evaluation model.
The Bohai sea A oil field mainly adopts a reverse nine-point well pattern development mode, polymer flooding and well pattern encryption different combination mode research is carried out on the Bohai sea A oil field, an economic evaluation model established by the invention is adopted for economic evaluation, and specific parameter values are shown in a table 2.
TABLE 2 Bohai sea A oil field economic parameter values
| Parameter(s) | Value taking | Parameter(s) | Value taking |
| Well completion depth D, m | 1450 | Crude oil commodity rate alpha | 0.96 |
| Feed per meter cost PdTen thousand yuan per mouth | 1.5 | Reference rate of return Ic，％ | 12 |
| Single well ground foundation investment I1sTen thousand yuan per mouth | 200 | Integrated tax rate R% | 31.3 |
| Polymer flooding single well incremental investment I2sTen thousand yuan per mouth | 200 | Resource tax Rs，％ | 3.6 |
| Operating cost per oil CmYuan/m3 | 700 | Cost of water injection Pw, Yuan/m3 | 13 |
| Price P of the PolymerpTen thousand yuan/t | 2 |
2. The technical evaluation of different combination modes of polymer flooding and well pattern encryption comprises the following specific processes:
firstly, establishing a typical numerical simulation model
And establishing a digital analog simulation model of the Bohai sea A oil field typical well group according to the target oil reservoir stratum structure, the oil reservoir type, the reservoir characteristics, the fluid property, the oil reservoir pressure and the temperature, wherein the specific parameters are shown in a table 3, and the polymer viscosity-concentration curve is shown in a figure 2.
TABLE 3 basic parameters of Bohai sea A typical well group encryption and polymer flooding model
| Parameter name | Parameter value | Parameter name | Parameter value |
| Oil-containing area, km2 | 2.02 | Geological reserve, 104t | 1653 |
| Average permeability, mD | 1200 | Injection-production ratio | 1:1 |
| Coefficient of permeability variation | 0.6 | Water content before encryption/ |
70 |
| Viscosity of underground crude oil, |
60 | Base pattern well spacing, m | 350 |
| Original well pattern injection-production corresponding rate | 0.7 | Number of well groups | 4 |
Model History fitting
And (3) assigning typical model production data according to actual production data of the Bohai sea A oil field, and performing model fitting, wherein fitting indexes are mainly water content in the whole region, and a water content fitting curve is shown in a figure 3.
Thirdly, simulating different combination mode schemes to obtain the recovery ratio of different combination modes
According to the characteristics of the current polymer flooding and well pattern encryption combined development, five combined modes of basic water flooding, water flooding + polymer flooding, water flooding + encryption water flooding, water flooding + encryption + polymer flooding, water flooding + polymer flooding + encryption, water flooding + encryption polymer flooding are designed, under each development mode, the water content of the replacing time of different replacing modes is 70%, and injection-production balance is kept in the process of each development mode.
(iv) technical evaluation of different combination mode schemes
And thirdly, the simulation result is shown in a table 4, and the water drive and the encryption polymer flooding have the highest recovery ratio and the better development effect.
TABLE 4 simulation results of polymer, well pattern encryption combination development scheme
| Scheme(s) | Recovery ratio of | Enhanced recovery ratio of |
| Water drive | 33.15 | 0 |
| Water drive and polymer drive | 43.27 | 10.12 |
| Water drive and encryption water drive | 39.47 | 6.32 |
| Water drive, encryption and polymer drive | 47.44 | 14.29 |
| Water drive, polymer drive and encryption | 44.31 | 11.16 |
| Water drive and encryption polymer drive | 47.49 | 14.34 |
3. Oil price grading evaluation of different combination modes of polymer flooding and well pattern encryption;
and (3) calculating the net present value of different schemes by using the model in the step 1, wherein the net present value is greater than 0 and represents profit, the net present value is less than 0 and represents no profit, and the higher the net present value is, the better the development effect is. And obtaining oil price limits of different combination modes according to the oil price points with the same net present value of different combination modes, and further obtaining the oil price application ranges of different combination modes, which are detailed in table 5.
TABLE 5 evaluation result table of oil price applicability of polymer and well pattern encrypted combination development (injection-production corresponding rate 0.7, well gathering 350m)
4. Under the influence of different injection-production corresponding rates and well pattern densities, carrying out oil price grading evaluation on polymer flooding and well pattern encryption in different combination modes;
and (3) repeating the steps 2-3 according to different well pattern densities to obtain different combination modes of oil price grading evaluation of polymer flooding and well pattern encryption under the influence of different well pattern densities, wherein only three conditions of the well spacing of 350m, 260m and 180m are listed, and the method can be used for carrying out organic grading evaluation on different combination development modes under any well pattern density, and is shown in tables 6-8.
TABLE 6 evaluation result table of oil price applicability of polymer and well pattern encrypted combination development (well gather 350m)
TABLE 7 evaluation result table of oil price applicability of polymer and well pattern encrypted combination development (well gather 350m)
TABLE 8 evaluation results of oil price for polymer and well pattern encryption combination development (well gather 350m)
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the scope of protection thereof, and although the present application is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: after reading this application, those skilled in the art will be able to make various changes, modifications and equivalents to the embodiments of the application, which are within the scope of the claims appended hereto.
Claims (2)
1. A polymer flooding and well pattern encryption combined development mode applicability evaluation method is characterized by comprising the following steps:
s1, establishing a polymer flooding and well pattern encryption combined economic evaluation model, which comprises the following specific processes:
calculating annual cash inflow:
CI＝α×Qoi×P0
in the formula, QoiM is annual oil production3；PoIs the crude oil price, yuan/m3(ii) a Alpha is the commodity rate of crude oil,%;
calculating annual cash outflow:
CO＝Co+Cr
in the formula, CoThe operation cost of crude oil is low; crIs tax, dollar, wherein the crude oil operating costs include square oil operating costs, water injection and polymer injection costs:
Co＝QoiCm+QwiPw+QpiPp
in the formula, CmFor each oil production operating cost, Yuan/m3；QwiM is the annual water injection amount3；PwFor the cost of water injection, Yuan/m3；QpiThe annual amount of polymerization, t; ppIs the polymer price, m/t;
the tax is replaced by two parts of comprehensive tax rate and resource tax:
Cr＝α×Qoi×Po×(R+Rs) (4)
in the formula, R is the comprehensive tax rate,%; rsResource tax rate,%;
calculating the dispersion cost:
the discrete cost is the cost generated in the current year by initial drilling investment, well pattern encryption and polymerization flooding measure adjustment:
in the formula, n1The number and the mouth of the basic well pattern wells; n is2Increasing the number of newly added wells for well pattern encryption; d is the well depth of completion, m; pdIs unit footage cost, yuan/m; i is1sThe average single well ground base investment is calculated; i is2sThe polymer flooding average single well increases investment, unit/port; vr1The present value, Yuan/Yuan of the average single-well ground equipment residual value at the end of the original well network exploitation period; vr2The method is characterized in that the method is a simple method for calculating the average single-well ground equipment residual value at the end of a new well exploitation period; t is t1Switching the time of polymer flooding for years; t is t2To encrypt opportunity, year, icA baseline rate of return;
the economic evaluation model established by the fourth step is as follows:
in the formula, the coefficients A, B, C all take the value 0 or 1, and different value combinations respectively represent different displacement modes;
s2, carrying out technical evaluation on different combination modes of polymer flooding and well pattern encryption;
s3, carrying out economic evaluation on the polymer flooding and well pattern encryption in different combination modes according to the economic evaluation model to obtain the oil price application ranges of different combination modes;
and S4, grading and evaluating the oil prices of different combination modes of polymer flooding and well pattern encryption based on different injection-production corresponding rates and well pattern density influences.
2. The method for evaluating the suitability of the polymer flooding and well pattern encryption combined development mode according to claim 1, wherein the technical evaluation of different combined modes of polymer flooding and well pattern encryption is as follows:
firstly, establishing a typical numerical simulation model according to the target oil reservoir stratum structure, the oil reservoir type, the reservoir characteristics, the fluid property, the oil layer pressure and the temperature;
performing model fitting according to actual production data of the target block and assignment typical numerical simulation model production data to obtain the water content of the whole area meeting the fitting requirement;
simulating different combination modes to obtain the recovery ratios of the different combination modes;
and fourthly, evaluating the technical scheme of different combined modes.
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| CN111322055B (en) * | 2020-02-12 | 2022-03-18 | 大庆油田有限责任公司 | Method and device for developing thin-difference oil layer well pattern reconstruction |
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