Judgment method of single well profitability and judgment method of oil well development demand

Abstract

The invention provides a single well profitability determination method and an oil well development demand determination method, and the method comprises the steps: S10, determining a calculation formula of the lowest cumulative yield of the complete cost of a single oil well in an evaluation block according to a complete cost control and reduction target and the single well cumulative yield, s20, determining a value taking mode of each parameter in the formula (1); s30, obtaining single well EURc values of different complete cost control and drop targets according to a formula (1); and S40, judging the profitability of a single oil well according to the single well EURc values of different complete cost control targets and the single well EUR value predicted by the geological evaluation block. The problem that in the prior art, the single well profitability is not easy to judge is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield development, and in particular to a method for determining the profitability of a single well and a method for determining the demand for oilwell development. Background Art

[0002] In the process of oil extraction, the full cost is used as a core indicator for annual assessment of operating results because it contains the completeness of the cost composition. At present, the full cost research mainly conducts year-on-year or month-on-month analysis according to the cost composition type or cost-generating department. The advantage is that it directly reflects the total cost consumed by different production units in the process of oil and gas production, which is convenient for predicting operating profits. The disadvantage is that it only analyzes the composition and changes of the full cost at the financial level, and fails to link it with the geological factors that are the fundamental driving force of the cost. It is impossible to analyze the reasons for the generation of full costs from a geological perspective, the composition structure that affects the full cost, and the room for the reduction of the full cost. It is impossible to judge whether a single oil well can be profitable before development or during the continued development process, and it is impossible to judge whether the oil well is drilled in the block.

[0003] In other words, the existing technology has the problem that it is difficult to judge the profitability of a single well. Summary of the invention

[0004] The main purpose of the present invention is to provide a method for determining the profitability of a single well and a method for determining the demand for oil well development, so as to solve the problem in the prior art that it is difficult to determine the profitability of a single well.

[0005] In order to achieve the above object, according to one aspect of the present invention, a method for determining the profitability of a single well is provided, comprising:

[0006] Step S10: Determine the calculation formula for the minimum cumulative production of a single oil well in the assessment block based on the total cost reduction target and the cumulative production of a single well.

[0007]

[0008] Step S20: determine the value of each parameter in formula (1); Step S30: obtain the single well EURc of different full cost reduction targets according to formula (1); Step S40: judge the profitability of a single oil well according to the single well EURc value of different full cost reduction targets and the single well EUR value of geological prediction of the evaluation block; wherein EURc is the minimum cumulative production of a single well to recover the full cost of the single well, in units of ten thousand tons; Iwell is the total investment of a single well, in units of ten thousand yuan / well; Iinj is the investment allocated to the injection well, in units of ten thousand yuan / well; Iaba n is the abandonment cost of a single well, in ten thousand yuan / well; Cf is the fixed operating cost, in ten thousand yuan / well / year; T is the life span of a single well, in years; R0 is the crude oil commodity rate, in f; Call is the total cost reduction target, in US dollars / barrel; Rtb is the ton-barrel ratio, in barrels / ton; Rex is the exchange rate of US dollars to RMB, in yuan / US dollars; Cv is the variable operating cost, in yuan / ton; Tax is the tax, in yuan / ton; Cper is the period cost, in yuan / ton; Cexp is the geological exploration cost, in yuan / ton.

[0009] Furthermore, step S10 also includes: constructing a relationship between the total target amount of complete cost reduction and production of a single well; constructing a relationship between the actual total total cost of a single well and production of a single well; combining the relationship between the total target amount of complete cost reduction and production of a single well and the relationship between the actual total total cost of a single well and production of a single well to determine the calculation formula for the minimum cumulative production of the complete cost of a single oil well.

[0010] Furthermore, step S20 includes: the values ​​of the total investment in a single well Iwell, the amortized investment in the injection well Iinj, the abandonment cost of a single well Iaban, the life span of a single well T, the fixed operating cost Cf, and the variable operating cost Cv, which are the actual values ​​incurred in the previous accounting year of the assessment block or the analogous block of the assessment block; the taxes and fees Tax are determined according to the full cost control and reduction target, wherein the taxes and fees Tax are related to the resource tax, the urban maintenance and construction tax, the education surcharge and the special oil revenue; the period expenses Cper and the geological exploration expenses Cexp are the actual statistical values ​​of the previous accounting year; the crude oil commodity rate R0, the ton-barrel ratio Rtb, and the US dollar-RMB exchange rate Rex are the average values ​​of the year before the assessment base date.

[0011] Furthermore, in the process of determining taxes and fees based on the full cost control and reduction target, the resource tax, urban maintenance and construction tax, education surcharge and special petroleum revenue are calculated separately according to the full cost control and reduction target and then added together to obtain the taxes and fees. Among them, if the full cost control and reduction target does not reach the special petroleum revenue starting point, the special petroleum revenue will not be calculated.

[0012] Furthermore, step S30 includes: step S31: determining the well type; step S32: determining the parameters in step S20 according to the well type; step S33: determining a plurality of different total cost reduction targets; and step S34: obtaining a plurality of single-well EURc values ​​of different total cost reduction targets according to formula (1) and the parameters determined in step S32.

[0013] Furthermore, step S40 includes: if the single-well EURc value of the full cost control reduction target is lower than the single-well EUR value predicted by the geological prediction of the evaluation block, it means that the single oil well has a certain profitability; if the single-well EURc value of the full cost control reduction target is higher than the single-well EUR value predicted by the geological prediction of the evaluation block, it means that the profitability of the single oil well does not meet the standard.

[0014] Furthermore, step S40 also includes: drawing a single well EURc value diagram under different full cost reduction targets; comparing with the single well EUR value predicted by the geological prediction of the assessment block to determine the profitability of a single oil well.

[0015] Furthermore, step S40 also includes: drawing a comparison chart of the single well EURc value under different full cost reduction targets and the single well EUR value predicted by the geological forecast of the assessment block, and judging the profitability of a single oil well according to the comparison chart.

[0016] According to another aspect of the present invention, a method for determining oil well development demand is provided, comprising: determining whether an oil well is profitable according to the above-mentioned method for determining the profitability of a single well; and determining whether a block should be drilled according to profitability.

[0017] Furthermore, the process of determining whether to develop an oil well based on profitability includes: if the oil well is profitable, drilling in the block; if the oil well is not profitable, not drilling in the block.

[0018] Using the technical solution of the present invention, a method for determining the profitability of a single well includes:

[0019] Step S10: Determine the calculation formula for the minimum cumulative production of a single oil well in the assessment block based on the total cost reduction target and the cumulative production of a single well.

[0020]

[0021]

[0022] Step S20: Determine the value of each parameter in formula (1);

[0023] Step S30: Obtaining single well EURc values ​​for different full cost reduction targets according to formula (1);

[0024] Step S40: The profitability of a single oil well is determined according to the single well EURc value of different full cost control reduction targets and the single well EUR value of the geological prediction of the assessment block; wherein, EURc is the minimum cumulative production of a single well to recover the full cost of the single well, in ten thousand tons; Iwell is the total investment of a single well, in ten thousand yuan / well; Iinj is the investment shared by the injection well, in ten thousand yuan / well; Iaban is the abandonment cost of a single well, in ten thousand yuan / well; Cf is the fixed operating cost, in ten thousand yuan / well / year; T is the life span of a single well, in year; R0 is the crude oil commodity rate, in f; Call is the full cost control reduction target, in US dollars / barrel; Rtb is the ton-barrel ratio, in barrels / tons; Rex is the exchange rate of US dollars to RMB, in yuan / US dollars; Cv is the variable operating cost, in yuan / ton; Tax is the tax, in yuan / ton; Cper is the period cost, in yuan / ton; Cexp is the geological exploration cost, in yuan / ton.

[0025] This application calculates the minimum cumulative production of a single oil well at full cost through the calculation formula of the minimum cumulative production of a single oil well at full cost, and judges whether the well is profitable by comparing the calculated minimum cumulative production of a single oil well at full cost with the single well EUR value predicted by the geological forecast of the evaluation block. This application breaks the existing model of purely financial analysis of full cost, links financial indicators with geological indicators, and creates a relationship between full cost and cumulative production of a single well, starting from the smallest unit of oil field production and cost generation - a single well, and proposes a new assessment indicator for the profitability of a single well in an undeveloped block of an oil field, providing a simple and intuitive new method for the benefit evaluation of undeveloped blocks of oil fields and the analysis of the difference in full cost of single wells in different blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 A single well cumulative production and full cost break-even analysis diagram showing an optional embodiment of the present invention; and

[0028] Figure 2 A flow chart showing a method for determining the profitability of a single well according to an optional embodiment of the present invention;

[0029] Figure 3 Shows Figure 2 The specific flow chart of step S30;

[0030] Figure 4 It shows a single well EURc query chart under different full cost reduction targets for vertical wells in the first embodiment of the present invention;

[0031] Figure 5 The single well EURc query chart under different total cost reduction targets for horizontal wells in the first embodiment of the present invention is shown. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0034] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0035] In order to solve the problem in the prior art that it is difficult to judge the profitability of a single well, the present invention provides a method for judging the profitability of a single well and a method for judging the demand for oil well development.

[0036] like Figures 1 to 5 As shown in the figure, the method for determining the profitability of a single well includes:

[0037] Step S10: Determine the calculation formula for the minimum cumulative production of a single oil well in the assessment block based on the total cost reduction target and the cumulative production of a single well.

[0038]

[0039] Step S20: Determine the value of each parameter in formula (1);

[0040] Step S30: Obtaining single well EURc values ​​for different full cost reduction targets according to formula (1);

[0041] Step S40: The profitability of a single oil well is determined according to the single well EURc value of different full cost control reduction targets and the single well EUR value of the geological prediction of the assessment block; wherein, EURc is the minimum cumulative production of a single well to recover the full cost of the single well, in ten thousand tons; Iwell is the total investment of a single well, in ten thousand yuan / well; Iinj is the investment shared by the injection well, in ten thousand yuan / well; Iaban is the abandonment cost of a single well, in ten thousand yuan / well; Cf is the fixed operating cost, in ten thousand yuan / well / year; T is the life span of a single well, in year; R0 is the crude oil commodity rate, in f; Call is the full cost control reduction target, in US dollars / barrel; Rtb is the ton-barrel ratio, in barrels / tons; Rex is the exchange rate of US dollars to RMB, in yuan / US dollars; Cv is the variable operating cost, in yuan / ton; Tax is the tax, in yuan / ton; Cper is the period cost, in yuan / ton; Cexp is the geological exploration cost, in yuan / ton.

[0042] To analyze the full cost of a single well, we first start with the full cost accounting method. The specific calculation formula for the full cost is as follows:

[0043]

[0044] In the full cost calculation formula, operating costs, taxes, period costs and geological exploration fees can be directly calculated using the statistical values ​​of the evaluation block or similar blocks in the previous year. When the full cost we analyze is for the entire life cycle of a single well, the depreciation amount should be equal to the total investment of the single well, which includes drilling and completion investment, surface investment and abandonment costs.

[0045] When the crude oil sales price is fixed, if you want to ensure a certain profit margin, you must start by controlling and reducing the total cost. From formula (2), we can see that if you want to control and reduce the total cost, it is not as simple as reducing the various costs in the numerator or increasing the total output in the denominator, because increasing production is generally accompanied by increasing the number of production wells or increasing production measures. Increasing the number of wells means increasing depreciation, and increasing production measures means increasing operating costs or depreciation. After the cost and production are analyzed by a single well, a critical point between the cumulative production of a single well and the total cost can be found. This critical point is the core node of the single well's profit and loss balance. As long as the cumulative production of a single well reaches above the critical value, it can ensure that the total cost is controlled within the established target and has a certain profitability.

[0046] This application calculates the minimum cumulative production of a single oil well at full cost through the calculation formula of the minimum cumulative production of a single oil well at full cost, and judges whether the well is profitable by comparing the calculated minimum cumulative production of a single oil well at full cost with the single well EUR value predicted by the geological forecast of the evaluation block. This application breaks the existing model of purely financial analysis of full cost, links financial indicators with geological indicators, and creates a relationship between full cost and cumulative production of a single well, starting from the smallest unit of oil field production and cost generation - a single well, and proposes a new assessment indicator for the profitability of a single well in an undeveloped block of an oil field, providing a simple and intuitive new method for the benefit evaluation of undeveloped blocks of oil fields and the analysis of the difference in full cost of single wells in different blocks.

[0047] It should be noted that a single well refers to a single oil well.

[0048] Specifically, step S10 also includes: constructing a relationship between the total target amount of complete cost reduction of a single well and the production; constructing a relationship between the total actual complete cost of a single well and the production; determining the calculation formula for the minimum cumulative production of the complete cost of a single oil well based on the relationship between the total target amount of complete cost reduction of a single well and the production, and the relationship between the total actual complete cost of a single well and the production. There is an intersection between the total target amount of complete cost reduction of a single well and the total actual complete cost of a single well, which indicates that the total target amount of complete cost reduction of a single well and the total actual complete cost of a single well are equal at this time, that is, the break-even point we need, and the minimum cumulative production of the complete cost of a single oil well can be obtained based on this balance point.

[0049] Specifically, step S20 includes: the values ​​of the total investment in a single well Iwell, the allocated investment in the injection well Iinj, the abandonment cost of a single well Iaban, the life span of a single well T, the fixed operating cost Cf, and the variable operating cost Cv, which are the actual values ​​incurred in the previous accounting year of the assessment block or the analogous block of the assessment block; the taxes and fees Tax are determined according to the full cost reduction target, wherein the taxes and fees Tax are related to the resource tax, the urban maintenance and construction tax, the education surcharge and the special oil revenue; the period expenses Cper and the geological exploration expenses Cexp adopt the actual statistical values ​​of the previous accounting year; the crude oil commodity rate R0, the ton-barrel ratio Rtb, and the US dollar-RMB exchange rate Rex adopt the average values ​​of the year before the assessment base date.

[0050] Specifically, in the process of determining the tax according to the full cost reduction target, the resource tax, urban maintenance and construction tax, education surcharge and special oil revenue are calculated according to the full cost reduction target and then added together to obtain the tax. If the full cost reduction target does not reach the special oil revenue threshold, the special oil revenue will not be calculated. The special oil revenue threshold is US$65 per barrel.

[0051] Specifically, step S30 includes: step S31: determining the well type; step S32: determining the parameters in step S20 according to the well type; step S33: determining multiple different full cost reduction targets; step S34: obtaining the single well EURc of multiple different full cost reduction targets according to formula (1) and the parameters determined in step S32. The full cost reduction target may have several different targets such as high, medium and low or a reduction range. The present application can calculate the profitability of a single well under different full cost reduction targets. The present application can simultaneously calculate the single well EURc values ​​of different full cost reduction targets corresponding to several different well types.

[0052] Specifically, step S40 includes: if the single-well EURc value of the full cost control reduction target is lower than the single-well EUR value predicted by the geological prediction of the evaluation block, it means that the single oil well has a certain profitability; if the single-well EURc value of the full cost control reduction target is higher than the single-well EUR value predicted by the geological prediction of the evaluation block, it means that the profitability of the single oil well does not meet the standard.

[0053] Optionally, step S40 further includes: drawing a single well EURc value graph under different full cost reduction targets; and comparing it with the single well EUR value predicted by the geological prediction of the evaluation block to determine the profitability of the single oil well. The profitability of a single oil well can be determined by drawing a single well EURc value graph under different full cost reduction targets and comparing it with the single well EUR value predicted by the geological prediction of the evaluation block.

[0054] Optionally, step S40 further includes: drawing a comparison chart of single well EURc under different full cost reduction targets and single well EUR predicted by geological prediction of the evaluation block, and judging the profitability of a single oil well according to the comparison chart. The profitability of a single well can also be judged by drawing a comparison chart of single well EURc under different full cost reduction targets and single well EUR predicted by geological prediction of the evaluation block.

[0055] The method for determining the demand for oil well development includes determining whether the oil well is profitable based on the above-mentioned method for determining the profitability of a single well; and determining whether the oil well should be developed based on profitability.

[0056] Specifically, the process of judging whether to develop an oil well based on profitability includes: if the oil well is profitable, then a new oil well is drilled in the block; if the oil well is not profitable, then no new oil well is drilled in the block. Of course, when the oil well is not profitable, you can also choose to further optimize the development technology, reduce costs or increase production capacity, and then judge the profitability of the oil well.

[0057] By comparing the total cost structure and single-well EURc of similar blocks horizontally, we can examine and evaluate the production capacity demand of the block under different total cost reduction targets, and determine whether it is necessary to further optimize the development plan or technology of this block.

[0058] Embodiment 1

[0059] The following is a detailed explanation using a specific oil well.

[0060] This example calculates the minimum cumulative production (EURc) of a single well at full cost recovery for Oilfield A. The full cost reduction target is $40 / barrel. This calculation adds $30 / barrel, $35 / barrel, $45 / barrel, $50 / barrel, and $55 / barrel, for a total of 6 full cost reduction target values, which are convenient for subsequent comparative analysis.

[0061] According to the actual value of oil field A in the previous fiscal year, the total investment of a single well, the investment of injection wells allocated to a single oil well, the abandonment cost of a single well, the life of a single well, fixed operating costs and variable operating costs are collected. The total investment of a single well includes the investment in drilling and completion of a single well and the surface investment. The period expenses and geological exploration expenses directly adopt the actual statistical values ​​of the company in the previous fiscal year.

[0062] The ton-barrel ratio, USD / RMB exchange rate and crude oil commodity rate are all based on the average value of the year before the assessment base date.

[0063] Taxes and fees need to be calculated separately for resource tax, urban maintenance and construction tax, education surcharge and special oil revenue according to different full cost control and reduction target values, and then added up. The resource tax rate is 4.8%, the urban maintenance and construction tax rate is 5%, and the education surcharge is 5%. Since the full cost control and reduction target values ​​calculated this time did not reach the starting point of the special oil revenue (US$65 / barrel), there is no special oil revenue in this calculation.

[0064] The specific values ​​of the above parameters are shown in Table 1.

[0065] Table 1 is a table of parameter values ​​for the minimum cumulative production (EURc) of a single well in oil field A to recover full costs.

[0066]

[0067] Substituting the above parameters into formula (1), we can calculate the EURc of vertical and horizontal wells corresponding to the change of the total cost reduction target from US$30 / barrel to US$55 / barrel.

[0068] Table 2 is the table of EURc values ​​for a single well under different full cost reduction targets of Oilfield A

[0069]

[0070] Based on the calculation results in Table 2, the single well EURc query chart of vertical wells and horizontal wells under different full cost reduction targets of Oilfield A is drawn, see Figure 4 and Figure 5 .

[0071] Through the above calculations, we can see that when the target range of total cost reduction for Oilfield A is between $30 / barrel and $55 / barrel, the single well EURc of vertical wells should be controlled at 11,000 to 5,000 tons, and the single well EURc of horizontal wells should be controlled at 27,500 to 12,200 tons to ensure the profitability of the single well. Otherwise, the contribution of oil wells below this standard to the economic benefits of the oilfield will be negative. Compared with the single well EUR predicted by the reservoir engineer of Oilfield A, if the calculated single well EURc is lower than the predicted single well EUR, it means that the block has a certain profitability and meets the conditions for total cost reduction. If the calculated single well EURc is higher than the predicted single well EUR, it means that the current profitability of the block does not meet the standard, and further optimization of development technology is needed to reduce costs or increase single well production capacity.

[0072] At the same time, this indicator can also be used as the lower limit standard for single wells in evaluating SEC-proven undeveloped reserves of Oilfield A. If the future predicted EUR of a single well in the undeveloped block is higher than the calculated indicator in Table 2, the SEC-proven undeveloped reserves can be calculated. Otherwise, it will not be evaluated as SEC-proven reserves.

[0073] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0074] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0075] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for determining the profitability of a single well, characterized in that: include: Step S10: Determine the calculation formula for the minimum cumulative production of a single oil well in the assessment block based on the total cost reduction target and the cumulative production of a single well. Step S20: Determine the value of each parameter in the formula (1); Step S30: Obtaining single well EURc values ​​for different full cost reduction targets according to formula (1); Step S40: judging the profitability of the single oil well according to the single well EURc values ​​of different full cost reduction targets and the single well EUR value predicted by the geological conditions of the assessment block; Where EURc is the minimum cumulative production of a single well to recover the full cost of the single well, in 10,000 tons; well is the total investment for a single well, in ten thousand yuan per well; I inj Investment allocated to injection wells, unit: 10,000 yuan / well; I aban is the single well abandonment cost, in ten thousand yuan / well; C f is the fixed operating cost, in units of 10,000 yuan / well / year; T is the life of a single well, in years; R0 is the crude oil commodity rate, in units of f; C all is the total cost reduction target, in US dollars per barrel; R tb R is the ton-barrel ratio, in barrels / ton; ex C is the exchange rate of US dollar to RMB, in Yuan / US dollar; v is the variable operating cost, in Yuan / ton; T ax is the tax, in Yuan / ton; C per is the period cost, in Yuan / ton; C exp It is the geological exploration fee, in Yuan / ton.

2. The method for determining the profitability of a single well according to claim 1, characterized in that: The step S10 also includes: Construct the relationship between the total amount of complete cost reduction target and production of a single well; Construct the relationship between the actual total cost of a single well and the production of a single well; The relationship between the total target amount of full cost reduction for a single well and its production is combined with the relationship between the total actual full cost of a single well and its production to determine the calculation formula for the minimum cumulative production of a single oil well with full cost.

3. The method for determining the profitability of a single well according to claim 1, characterized in that: The step S20 includes: Single Well Total Investment I well 、Injection well allocation investment I inj 、Single well abandonment cost I aban , single well life T, fixed operating cost C f Variable operating costs C v The value of shall be the actual value of the previous fiscal year of the assessment block or the analogy block of the assessment block; Taxes and fees are determined based on the full cost reduction target, among which taxes and fees are related to resource tax, urban maintenance and construction tax, education surcharge and special oil revenue. Period Cost C per and geological exploration costs C exp Use the actual statistical values ​​of the previous fiscal year; Crude oil commodity rate R0, ton barrel ratio R tb , USD to RMB exchange rate R ex The average value of the year before the valuation base date is used.

4. The method for determining the profitability of a single well according to claim 3, characterized in that: In the process of determining the tax and fees according to the full cost control and reduction target, the resource tax, urban maintenance and construction tax, education surcharge and special petroleum revenue are calculated separately according to the full cost control and reduction target and then added together to obtain the tax and fees. If the full cost control and reduction target does not reach the starting point of the special petroleum revenue, the special petroleum revenue will not be calculated.

5. The method for determining the profitability of a single well according to claim 1, characterized in that: The step S30 includes: Step S31: determine the well type; Step S32: determining the parameters in step S20 according to the well type; Step S33: determining a plurality of different full cost reduction targets; Step S34: Obtain a plurality of single-well EURcs with different complete cost reduction targets according to the formula (1) and the parameters determined in step S32.

6. The method for determining the profitability of a single well according to claim 1, characterized in that: The step S40 includes: If the single well EURc value of the full cost reduction target is lower than the single well EUR value predicted by the geological conditions of the assessment block, it means that the single oil well has a certain profitability; If the single-well EURc value of the full cost reduction target is higher than the single-well EUR value predicted by the geological forecast of the assessment block, it means that the profitability of the single oil well does not meet the target.

7. The method for determining the profitability of a single well according to claim 1, characterized in that: The step S40 also includes: Draw a single well EURc value diagram under different full cost reduction targets; By comparing the EUR value of a single well with the geological prediction of the assessment block, the profitability of the single oil well is determined.

8. The method for determining the profitability of a single well according to claim 1, characterized in that: The step S40 also includes: A comparison chart is drawn between the single well EURc under different full cost reduction targets and the single well EUR predicted by the geological forecast of the assessment block, and the profitability of the single oil well is determined based on the comparison chart.

9. A method for determining oil well development requirements, characterized in that: include: Determining whether an oil well is profitable according to the method for determining profitability of a single well according to any one of claims 1 to 8; The block is judged whether to drill or not based on the profitability described.

10. The method for determining oil well development demand according to claim 9, characterized in that: The process of determining whether to drill a block based on the profitability includes: If the oil well is profitable, drilling a well in the block; If the oil well is not profitable, no well will be drilled in the block.

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