Method for determining single-well profitability and method for determining oil well development requirements

Abstract

The application provides a single well profitability determination method and an oil well development demand determination method, and the single well profitability determination method comprises the following steps: step S10, determining a calculation formula of a minimum cumulative production of a single well complete cost of an evaluation block according to a complete cost control target and a single well cumulative production; step S20, determining a value mode of each parameter in formula (1); step S30, obtaining single well EURc values of different complete cost control targets according to formula (1); and step S40, determining the profitability of a single well according to the single well EURc values of different complete cost control targets and single well EUR values predicted by geology of the evaluation block. The application solves the problem that the profitability of a single well is not easy to determine in the prior art.

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 oil production process, full cost, due to its comprehensive coverage of cost components, serves as a core indicator for annual operational performance assessments. Currently, full cost research primarily analyzes year-over-year or quarter-over-quarter changes based on cost component type or cost-generating department. This has the advantage of directly reflecting the total costs incurred by different production units during oil and gas production, facilitating the prediction of operating profits. However, it also has the disadvantage of analyzing the composition and changes of full cost only at a financial level, failing to link this to the underlying geological drivers of cost generation. This makes it impossible to analyze the geological causes of full cost, the impact on its composition, and the potential for full cost reduction. Consequently, it is impossible to determine the profitability of individual oil wells before or during development, or to determine whether a well should be drilled in the appropriate area.

[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 development demand of an oil well, so as to solve the problem in the prior art that it is difficult to determine the profitability of a single well.

[0005] 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 full cost reduction target and the cumulative production of the 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: Determine the profitability of a single oil well based on the single-well EURc values ​​of different full cost reduction targets and the single-well EUR values ​​predicted by the geological conditions 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 allocated to the injection well, in 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 of a single well, in years; R0 is the crude oil commodity rate, in f; Call is the full 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 dollar; 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 of a single well and the production; constructing a relationship between the actual total total cost of a single well and the production; combining the relationship between the total target amount of complete cost reduction of a single well and the production and the relationship between the actual total total cost of a single well and the production 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 adopt the actual values ​​incurred in the previous accounting year of the assessment block or the analogous block of the assessment block; taxes and fees Tax are determined based on 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 adopt the actual statistical values ​​of the previous accounting year; the crude oil commodity rate R0, the ton-barrel ratio Rtb, and the USD / RMB exchange rate Rex adopt 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, resource tax, urban maintenance and construction tax, education surcharge and special oil revenue are calculated separately according to the full cost control and reduction target and then added together to obtain taxes and fees. Among them, if the full cost control and reduction target does not reach the starting point of the special oil revenue, the special oil 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 multiple different full cost reduction targets; step S34: obtaining single-well EURc values ​​of multiple different full 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 complete cost reduction target is lower than the single-well EUR value predicted by the geological forecast of the assessment block, it indicates that the single oil well has a certain profitability; if the single-well EURc value of the complete cost reduction target is higher than the single-well EUR value predicted by the geological forecast of the assessment block, it indicates 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; and comparing it with the single-well EUR value predicted by the geological forecast of the assessment block to determine the profitability of the single oil well.

[0015] Furthermore, step S40 also includes: drawing a comparison chart of the single well EURc values ​​under different full cost reduction targets and the single well EUR values ​​predicted by the geological forecast of the assessment block, and judging the profitability of the single oil well based on 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 single well profitability; 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 full cost reduction target and the cumulative production of the single well.

[0020]

[0021]

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

[0023] Step S30: Obtain the single-well EURc value for different full cost reduction targets according to formula (1);

[0024] Step S40: Determine the profitability of a single oil well based on the EURc values ​​of the single well at different full cost reduction targets and the EUR values ​​of the single well based on 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 the single well, in ten thousand yuan / well; Iinj is the amortized investment of the injection well, in ten thousand yuan / well; Iaban is the abandonment cost of the single well, in ten thousand yuan / well; Cf is the fixed operating cost, in ten thousand yuan / well / year; T is the life of the single well, in years; R0 is the crude oil commodity rate, in f; Call is the full 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.

[0025] This application calculates the minimum cumulative production of a single oil well based on the formula for the minimum cumulative production of the full cost of the well. The profitability of the well is determined by comparing the calculated minimum cumulative production of the full cost of the well with the single-well EUR value predicted by the geological forecast of the assessment block. This application breaks the existing model of analyzing full costs solely at the financial level, links financial indicators with geological indicators, and starts with the smallest unit that generates oil field production and costs - the single well. It creates a relationship between full cost and cumulative production of a single well, and proposes a new assessment indicator for the profitability of a single well in an undeveloped oil field block. This provides a simple and intuitive new method for evaluating the benefits of undeveloped oil field blocks and analyzing the differences in the full costs of single wells in different blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying 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 Shown Figure 2 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 embodiment 1 of the present invention;

[0031] Figure 5 The single-well EURc query chart under different full cost reduction targets for horizontal wells in Example 1 of the present invention is shown. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this 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 meaning 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 direction; 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 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 development demand of an oil well.

[0036] like Figures 1 to 5 As shown in Figure 2, 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 full cost reduction target and the cumulative production of the single well.

[0038]

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

[0040] Step S30: Obtain the single-well EURc value for different full cost reduction targets according to formula (1);

[0041] Step S40: Determine the profitability of a single oil well based on the EURc values ​​of the single well at different full cost reduction targets and the EUR values ​​of the single well based on 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 the single well, in ten thousand yuan / well; Iinj is the amortized investment of the injection well, in ten thousand yuan / well; Iaban is the abandonment cost of the single well, in ten thousand yuan / well; Cf is the fixed operating cost, in ten thousand yuan / well / year; T is the life of the single well, in years; R0 is the crude oil commodity rate, in f; Call is the full 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.

[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 expenses, and geological exploration fees can be calculated directly from the previous year's statistical values ​​for the assessment block or a similar block. When analyzing full costs for the entire life cycle of a single well, depreciation should equal the total investment in the well, which includes drilling and completion costs, surface costs, 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. This is because increasing production is generally accompanied by increasing the number of production wells or increasing production-enhancing measures. Increasing the number of wells means increasing depreciation, and increasing production-enhancing measures means increasing operating costs or depreciation. After analyzing the cost and production of a single well, we can find a critical point between the cumulative production of a single well and the total cost. This critical point is the core node of the profit and loss balance of a single well. 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 based on the formula for the minimum cumulative production of the full cost of the well. The profitability of the well is determined by comparing the calculated minimum cumulative production of the full cost of the well with the single-well EUR value predicted by the geological forecast of the assessment block. This application breaks the existing model of analyzing full costs solely at the financial level, links financial indicators with geological indicators, and starts with the smallest unit that generates oil field production and costs - the single well. It creates a relationship between full cost and cumulative production of a single well, and proposes a new assessment indicator for the profitability of a single well in an undeveloped oil field block. This provides a simple and intuitive new method for evaluating the benefits of undeveloped oil field blocks and analyzing the differences in the full costs 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 full cost reduction for a single well and production; constructing a relationship between the total actual full cost of a single well and production; and determining a calculation formula for the minimum cumulative production of a single oil well based on the relationship between the total target amount of full cost reduction for a single well and production, and the relationship between the total actual full cost of a single well and production. The total target amount of full cost reduction for a single well and the actual total full cost of a single well have an intersection, which indicates that the total target amount of full cost reduction for a single well and the actual total full cost of a single well are equal at this point, i.e., the required break-even point. Based on this break-even point, the minimum cumulative production of a single oil well based on full cost can be obtained.

[0049] Specifically, 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 adopt the actual values ​​incurred in the previous accounting year of the assessment block or the analogous block of the assessment block; taxes and fees Tax are determined based on the full cost control and reduction target, among which taxes and fees Tax are related to resource tax, urban maintenance and construction tax, education surcharge and special oil revenue; period expenses Cper and geological exploration expenses Cexp adopt the actual statistical values ​​of the previous accounting year; crude oil commodity rate R0, ton-barrel ratio Rtb, and USD / RMB exchange rate Rex adopt the average values ​​of the year before the assessment base date.

[0050] Specifically, when determining taxes and fees based on the full cost reduction target, the resource tax, urban maintenance and construction tax, education surcharge, and special oil revenue levy are calculated separately based on the full cost reduction target and then added together to obtain the tax and fees. If the full cost reduction target does not reach the special oil revenue levy threshold, the special oil revenue levy will not be calculated. The special oil revenue levy 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 based on the well type; step S33: determining multiple different full cost reduction targets; and step S34: obtaining the single-well EURc for multiple different full cost reduction targets based on formula (1) and the parameters determined in step S32. The full cost reduction targets may have several different targets, such as high, medium, and low, or a control range. This application can calculate the profitability of a single well under different full cost reduction targets. This application can simultaneously calculate the single-well EURc values ​​for different full cost reduction targets corresponding to several different well types.

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

[0053] Optionally, step S40 further includes plotting individual well EURc values ​​under different full cost reduction targets and comparing them with the individual well EUR values ​​predicted by geological conditions in the assessment block to determine the profitability of the individual oil well. The profitability of an individual oil well can be determined by plotting individual well EURc values ​​under different full cost reduction targets and comparing them with the individual well EUR values ​​predicted by geological conditions in the assessment block.

[0054] Optionally, step S40 further includes plotting a comparison chart of the EURc of a single well under different full cost reduction targets and the EUR of a single well predicted by geological conditions in the assessment block, and determining the profitability of the single oil well based on the comparison chart. Alternatively, the profitability of a single well may be determined by plotting a comparison chart of the EURc of a single well under different full cost reduction targets and the EUR of a single well predicted by geological conditions in the assessment 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 determining whether to develop an oil well based on profitability involves: if the well is profitable, then drilling a new well in that block; if the well is unprofitable, then not drilling a new well in that block. Of course, if the well is unprofitable, further optimization of development technology, reduction of costs or increase of production capacity can be considered, and then the profitability of the well can be determined.

[0057] Compare the full cost structure and single-well EURc of similar blocks horizontally, examine and evaluate the block's production capacity demand under different full cost reduction targets, and determine whether the development plan or technology of this block needs to be further optimized.

[0058] Example 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 per barrel. This calculation adds $30, $35, $45, $50, and $55 per barrel, for a total of six full cost reduction target values ​​to facilitate subsequent comparative analysis.

[0061] Based on the actual values ​​incurred in the previous fiscal year for Oilfield A, the total investment per well, the investment allocated to each injection well, the abandonment cost of each well, the life of each well, fixed operating costs, and variable operating costs are collected for vertical and horizontal well types. The total investment per well includes drilling and completion costs, as well as surface investments. Period expenses and geological exploration expenses are calculated directly based on the company's actual statistical values ​​from the previous fiscal year.

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

[0063] Taxes and fees are calculated separately for resource tax, urban maintenance and construction tax, education surcharge, and special oil revenue levy based on different full cost reduction targets, and then added together. The resource tax rate is 4.8%, the urban maintenance and construction tax rate is 5%, and the education surcharge rate is 5%. Since the full cost reduction targets calculated in this calculation do not reach the special oil revenue levy threshold (US$65 per barrel), the special oil revenue levy is not included in this calculation.

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

[0065] Table 1 shows the parameter values ​​of the minimum cumulative production (EURc) of a single well in oil field A with full cost recovery.

[0066]

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

[0068] Table 2 shows the EURc values ​​for individual wells under different full cost reduction targets in Oilfield A.

[0069]

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

[0071] The above calculations show that for Oilfield A, within the full cost reduction target range of $30 to $55 per barrel, vertical wells should maintain a per-well EURc of 11,000 to 5,000 tons, and horizontal wells should maintain a per-well EURc of 27,500 to 12,200 tons to ensure profitability. Otherwise, wells below this standard will contribute negatively to the oilfield's economic performance. If the calculated per-well EURc is lower than the predicted per-well EURc by the reservoir engineer at Oilfield A, the block has a reasonable level of profitability and meets the full cost reduction criteria. If the calculated per-well EURc is higher than the predicted per-well EURc, the block currently falls short of profitability and requires further optimization of development technologies to reduce costs or increase per-well productivity.

[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 in Oilfield A. If the future predicted EUR of a single well in the undeveloped block is higher than the indicator calculated in Table 2, SEC-proven undeveloped reserves can be calculated; otherwise, it cannot be evaluated as SEC-proven reserves.

[0073] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts 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, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0075] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0076] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection 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 full cost reduction target and the cumulative production of the single well. Step S20: determining the value of each parameter in the formula (1); Step S30: Obtain the single-well EURc value for different full cost reduction targets according to formula (1); Step S40: determining the profitability of the single oil well based on the single well EURc values ​​of different full cost reduction targets and the single well EUR value predicted by 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 tons; well is the total investment for a single well, in ten thousand yuan per well; I inj Investment allocated to injection wells, unit is 10,000 yuan / well; I aban is the abandonment cost of a single well, in ten thousand yuan / well; C f is the fixed operating cost, in ten thousand yuan / well / year; T is the life of a single well, in years; R0 is the crude oil commodity rate, in f; C all is the total cost reduction target, in US dollars per barrel; R tb Ton-barrel ratio, unit is barrel / ton; R ex The exchange rate of USD to RMB, in Yuan / USD; C v is the variable operating cost, in yuan / ton; T ax is the tax, the unit is yuan / ton; C per is the period cost, the unit is RMB / 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 further includes: Construct a relationship between the total cost reduction target and production of a single well; Construct the relationship between the actual total cost of a single well and its production; The relationship between the total target amount of full cost reduction of a single well and the production volume is combined with the relationship between the actual total full cost of a single well and the production volume to determine the calculation formula for the minimum cumulative production volume of a single oil well with full cost.

3. The method for determining the profitability of a single well according to claim 1, wherein: 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 is determined by adopting the actual value of the previous fiscal year of the assessment block or the analogy block of the assessment block; Taxes ax 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 assessment base date is used.

4. The method for determining the profitability of a single well according to claim 3, wherein: In the process of determining the tax and fees based on the full cost control and reduction target, the resource tax, urban maintenance and construction tax, education surcharge and special oil 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 oil revenue, the special oil revenue will not be calculated.

5. The method for determining the profitability of a single well according to claim 1, wherein: 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, wherein: 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, wherein: The step S40 further includes: Draw a single well EURc value diagram under different full cost reduction targets; The profitability of the individual well is determined by comparing the EUR value of the individual well with the geological prediction of the assessment block.

8. The method for determining the profitability of a single well according to claim 1, wherein: The step S40 further includes: A comparison chart is drawn between the EURc of a single well under different full cost reduction targets and the EUR of a single well predicted by geological means in 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 needs, 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 decision on whether to drill a well in a block is based on the profitability.

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 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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