Method and system for representing oil well failure and well repair in oil reservoir numerical simulation model

Abstract

The invention belongs to the technical field of oilfield development engineering, and particularly relates to a method and system for representing oil well failure and well repair in an oil reservoir numerical simulation model. The method comprises the steps that the initial production time rate, the oil well failure frequency and the workover operation frequency of an oil field are determined; according to the initial production time rate, the oil well failure frequency and the well repair operation frequency, the total production time rate of the oil field during oil well failure and well repair is obtained; and substituting the total production time rate of the oil field into the oil reservoir numerical simulation model to represent oil well failure and well repair. According to the method, the influence of the oil well failure and the workover operation on the oilfield development effect is represented in the oil reservoir numerical simulation model, so that an oil reservoir engineer can quickly and conveniently evaluate the influence of the oil well failure and the workover operation on the oilfield development effect, and a technical support is provided for compiling an oilfield development scheme and predicting indexes.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield development engineering, and in particular relates to a method and system for characterizing oil well failure and well repair in an oil reservoir numerical simulation model. Background Art

[0002] As oilfield development environments become increasingly harsh, and the service life of oil well tubing increases, its failure becomes increasingly prominent, easily causing significant economic losses and environmental pollution accidents. Oil well failures are often the result of the combined effects of temperature, stress, and corrosive media. For example, stress corrosion caused by H2S leads to pipeline cracking; uniform corrosion caused by CO2 significantly reduces the thickness of the pipeline, corroding from the inside out until the pipe wall is perforated and leaks; downhole packers fail due to factors such as pipe string pumping vibration, stuck layers, and interlayer differences; defects in the inner walls of the tubing and couplings cause puncture leaks, connecting the inside of the pipe to the outside, causing puncture leak failure; and objects falling into the wellbore. Well repair operations are the process of eliminating faults and improving wellbore conditions to restore normal production of oil and gas wells. Common well repair techniques include downhole fishing, pressurized operations, coiled tubing operations, main well repair, and well killing.

[0003] When formulating oilfield development plans, the impact of well failures and workovers needs to be considered. Currently, well failures and workovers are often characterized by shutting in or opening a well in a reservoir numerical simulation model. However, when predicting development plan indicators, it is often impossible to determine which specific wells will fail, and therefore which failed wells will be workovered. Summary of the Invention

[0004] In view of the above problems, the present invention provides a method for characterizing oil well failure and well repair in a reservoir numerical simulation model, the method comprising:

[0005] Determine the field's initial production rate, well failure frequency, and workover frequency;

[0006] Obtaining the total production time rate of the oil field during oil well failure and workover according to the initial production time rate, oil well failure frequency, and workover operation frequency;

[0007] The total production time rate of the oil field is substituted into the reservoir numerical simulation model to characterize oil well failure and well repair.

[0008] Preferably, according to the initial production time rate, the oil well failure frequency and the workover operation frequency, obtaining the total production time rate of the oil field during oil well failure and workover includes:

[0009] Obtain the first influencing factor on the oilfield production rate in the oil well failure scenario, the second influencing factor on the oilfield production rate during the well repair operation, and the third influencing factor on the oilfield production rate after the failed oil well is repaired;

[0010] The total production time rate of the oil field during oil well failure and well repair is obtained according to the first influencing factor, the second influencing factor and the third influencing factor.

[0011] Preferably, obtaining the first impact factor includes:

[0012] The first impact factor is obtained based on the number of normally producing oil wells and the number of artificial islands where the oil field is located.

[0013] Preferably, obtaining the second impact factor includes:

[0014] The second impact factor is obtained based on the number of normally producing oil wells, the number of artificial islands where the oil field is located, and the number of construction days required to repair each oil well.

[0015] Preferably, obtaining the third impact factor includes:

[0016] The third impact factor is obtained by taking the opposite value of the first impact factor.

[0017] Preferably, the method for obtaining the total production time rate of the oil field includes:

[0018] The first influencing factor is weighted by the number of failed oil wells to obtain a first weighted result;

[0019] The third influencing factor is weighted by the number of well repairs to obtain the second weighted result;

[0020] The total production time rate of the oil field is obtained according to the initial production time rate, the first weighted result, the second weighted result and the second influencing factor.

[0021] The present invention also provides a system for characterizing oil well failure and well repair in an oil reservoir numerical simulation model, the system comprising:

[0022] A determination module for determining the initial production rate of an oil field, the frequency of well failures, and the frequency of workover operations;

[0023] An acquisition module is used to obtain the total production time rate of the oil field during oil well failure and workover;

[0024] Characterization module, used to characterize oil well failure and well repair.

[0025] Preferably, the acquisition module includes a first acquisition unit and a second acquisition unit;

[0026] The first acquisition unit is used to acquire a first influencing factor on the oil field production rate in an oil well failure scenario, a second influencing factor on the oil field production rate during a well repair operation, and a third influencing factor on the oil field production rate after the failed oil well is repaired;

[0027] The second acquisition unit is used to acquire the total production time rate of the oil field when the oil well fails and the well is repaired.

[0028] Preferably, the first acquisition unit is used to acquire a first influencing factor on the oil field production rate in an oil well failure scenario, including:

[0029] The first acquisition unit is used to obtain a first impact factor according to the number of normally producing oil wells and the number of artificial islands where the oil field is located.

[0030] Preferably, the first acquiring unit is used to acquire the second influencing factor on the oil field production rate during the well repair operation, including:

[0031] The first acquisition unit is used to obtain the second impact factor according to the number of normally producing oil wells, the number of artificial islands where the oil field is located, and the number of construction days required to repair each oil well.

[0032] Preferably, the first acquisition unit is used to acquire the third influencing factor on the oil field production rate after the repair of the failed oil well, including:

[0033] The first acquisition unit is configured to obtain the third impact factor by taking the inverse value of the first impact factor.

[0034] Preferably, the second acquisition unit is used to acquire the total production time rate of the oil field during oil well failure and workover, including:

[0035] The second acquisition unit is used to weight the first influencing factor using the number of failed oil wells to obtain a first weighted result;

[0036] The third influencing factor is weighted by the number of well repairs to obtain the second weighted result;

[0037] The production time rate of the second oil field is obtained according to the initial production time rate, the first weighted result, the second weighted result and the second influencing factor.

[0038] The present invention has the following beneficial effects:

[0039] (1) The present invention calculates the total production rate of the oil field by introducing the factors affecting the oil well failure on the oil field production rate, the factors affecting the oil well repair operation on the oil field production rate, and the factors affecting the oil field production rate after the failed oil well is repaired, thereby characterizing the impact of the oil well failure and the well repair operation on the oil field development effect in the reservoir numerical simulation model, so that reservoir engineers can quickly and conveniently evaluate the impact of the oil well failure and the well repair operation on the oil field development effect, and provide technical support for the preparation of oil field development plans and indicator predictions;

[0040] (2) The present invention does not require determining which specific oil wells will fail or be repaired. The failure and repair of oil wells can be characterized by simply determining the total production time rate of the oil field.

[0041] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 A diagram showing a method for characterizing oil well failure and well repair in a reservoir numerical simulation model according to an embodiment of the present invention;

[0044] Figure 2 A diagram showing a template diagram of an oilfield production rate table considering oil well failure and workover in an embodiment of the present invention;

[0045] Figure 3 A table showing the production rate of an offshore oil field considering only oil well failures in an embodiment of the present invention is shown;

[0046] Figure 4 A table showing the production rate of an offshore oil field considering oil well failure and workover in an embodiment of the present invention is shown;

[0047] Figure 5 A comparative curve diagram of the production time rate of an offshore oil field considering only oil well failure and considering oil well failure and well repair is shown in an embodiment of the present invention;

[0048] Figure 6 A system diagram for characterizing oil well failure and well repair in a reservoir numerical simulation model according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0049] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the present disclosure will be more comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced while omitting one or more of the specific details, or that other methods, components, devices, steps, etc. may be employed. In other cases, well-known technical solutions are not shown or described in detail to avoid obscuring various aspects of the present disclosure.

[0050] In addition, the accompanying drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. Identical reference numerals in the figures denote identical or similar parts, and thus repetitive descriptions thereof will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities that do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in software, in one or more hardware units or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0051] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all steps. For example, some steps may be decomposed, while some steps may be combined or partially combined, so the actual execution order may change according to actual circumstances.

[0052] 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 particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the application described herein can, for example, be implemented in an order other than that illustrated or described herein.

[0053] In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or submodules is not necessarily limited to those steps or submodules explicitly listed, but may include other steps or submodules not explicitly listed or inherent to such process, method, product or apparatus.

[0054] like Figure 1 As shown, the present invention proposes a method for characterizing oil well failure and well repair in a reservoir numerical simulation model, the method comprising:

[0055] S1 determines the initial production rate of the oil field, the frequency of oil well failures and the frequency of well workover operations;

[0056] S2: obtaining the total production time rate of the oil field during oil well failure and workover according to the initial production time rate, oil well failure frequency, and workover operation frequency;

[0057] S3 substitutes the total production time rate of the oil field into the reservoir numerical simulation model to characterize oil well failure and well repair.

[0058] Specifically, in S1, the initial production time rate of the oil field is obtained based on the actual production statistics of the oil field; the oil well failure frequency is determined by statistics of the oil field production history data; the well repair operation frequency is determined based on the oil field well failure frequency, the number of construction days required to repair a failed oil well, the number of well repair operation equipment, the well repair operation window period, etc.

[0059] Specifically, the steps of S2 are as follows:

[0060] S21 obtains the first influencing factor on the oilfield production rate in the oil well failure scenario, the second influencing factor on the oilfield production rate during the well repair operation, and the third influencing factor on the oilfield production rate after the failed oil well is repaired;

[0061] S22 obtains the total production time rate of the oil field during oil well failure and workover according to the first influencing factor, the second influencing factor, and the third influencing factor.

[0062] Specifically, the method for obtaining the first impact factor in S21 includes: obtaining the first impact factor according to the number of normally producing oil wells and the number of artificial islands where the oil field is located;

[0063] The method for obtaining the second impact factor in S21 includes: obtaining the second impact factor according to the number of normally producing oil wells, the number of artificial islands where the oil field is located, and the number of construction days required to repair each oil well;

[0064] The method for obtaining the third impact factor in S21 includes: taking the opposite value of the first impact factor to obtain the third impact factor.

[0065] Specifically, the method for obtaining the total production time rate of the oil field in S22 includes:

[0066] The first influencing factor is weighted by the number of failed oil wells to obtain a first weighted result;

[0067] The third influencing factor is weighted by the number of well repairs to obtain the second weighted result;

[0068] The total production time rate of the oil field is obtained according to the initial production time rate, the first weighted result, the second weighted result and the second influencing factor.

[0069] The detailed technical contents of the present invention are as follows:

[0070] 1) Impact of oil well failure on oil field production rate

[0071] During the production process of an oil field, as time goes by, some oil wells may fail and stop producing normally (i.e., oil well failure). Since it is not certain which wells may fail in the future, the failure of an oil well can be characterized by changing the oil field production rate in the numerical simulation model. The impact of an oil well failure on the oil field production rate can be expressed as:

[0072]

[0073] Where η1 is the influence factor of an oil well failure on the oil field production rate, decimal; M i is the number of oil wells that can produce normally on the i-th artificial island, and N is the total number of artificial islands in the oil field,.

[0074] 2) Impact of workover operations on oilfield production time

[0075] For offshore oilfields, workover operations typically require shutting down all wells on the artificial island where the failed well is located. Therefore, workovers on failed wells can impact the production of normally producing wells on the island. Similarly, since it's uncertain which specific failed wells will be workovered in the future, numerical simulation models can still represent workovers by changing the oilfield production rate. The impact of workovers on the oilfield production rate can be expressed as:

[0076]

[0077] Where η2 is the impact factor of well repair operation on oil field production rate, decimal; D is the number of construction days required to repair a failed oil well, days.

[0078] 3) Impact of failed oil well repair on oil field production rate

[0079] When a failed oil well is restored to production after a workover operation, the numerical simulation model can still be used to characterize the resumption of production by changing the oilfield production rate. The impact of a failed oil well repair on the oilfield production rate can be expressed as:

[0080] η3=-η1(3)

[0081] Among them, η3 is the impact factor of a failed oil well repaired on the oil field production rate, a decimal.

[0082] 4) Considering the total production time of the oil field after oil well failure and workover

[0083] η=η0+n×η1+η2+m×η3(4)

[0084] Among them, η is the total production time rate of the oil field after considering oil well failure and workover, a decimal; n is the total number of failed oil wells, a number; m is the total number of repaired oil wells, a number; η0 is the initial production time rate of the oil field, a decimal.

[0085] 5) Determine the frequency of oil well failures and workover operations in the oil field

[0086] Oil wells often fail during production due to faults in the wellhead, annulus, or tubing. The frequency of well failure varies across different oil fields. The frequency of well failure in a given field can be determined by analyzing historical production data.

[0087] The frequency of well repair operations needs to be determined based on the failure frequency of oil wells in the oil field, the number of construction days required to repair a failed oil well, the number of well repair equipment, the well repair operation window period, etc.

[0088] 6) Prepare an oilfield production rate table and set the oilfield production rate in the numerical simulation model according to the prepared table

[0089] After determining the impact of oil well failure on oil field production rate, the impact of failed oil well repair operation on oil field production rate, the impact of failed oil well repair on oil field production rate, oil well failure frequency and well repair operation frequency of the oil field, the Figure 2 The template shown here creates a table of oilfield production rates, taking into account well failures and workovers. In the figure, yyyy represents year, and mm represents month. By setting the oilfield production rates in a reservoir numerical simulation model based on this table, you can characterize the impact of well failures and workovers on oilfield production.

[0090] Example

[0091] An offshore oilfield is developed by drilling on artificial islands. Each island has eight production wells, for a total of five artificial islands, totaling 40 production wells. Ten of these wells have failed, leaving 30 wells operating normally. A statistical analysis of the oilfield's failed wells indicates a failure frequency of one well per year. Given the offshore location, the workover window for repairing a failed well is 40 days. Based on the workover window, the workover frequency for this oilfield is determined to be one failed well every two years. The initial production rate for the oilfield is 1.

[0092] according to Figure 2 The template shown in the figure can be used to calculate the production time rate of an offshore oil field considering only the failure of oil wells (e.g. Figure 3 as shown) and the production time of oil field considering oil well failure and workover (as shown Figure 4 shown). Figure 5The comparison of the production rate of the offshore oil field considering only oil well failure and considering oil well failure and well repair is shown. Figure 5 It can be seen that after the failed oil wells are repaired, the total production rate of the oil field is higher than that without repairing the wells.

[0093] like Figure 6 As shown, the present invention also proposes a system for characterizing oil well failure and well repair in a reservoir numerical simulation model, the system comprising:

[0094] Determination module 1, for determining the initial production time rate of the oil field, the frequency of oil well failure and the frequency of well repair operations;

[0095] Acquisition module 2, used to obtain the total production time rate of the oil field during oil well failure and well repair;

[0096] Characterization module 3 is used to characterize oil well failure and well repair.

[0097] The acquisition module 2 includes a first acquisition unit 21 and a second acquisition unit 22;

[0098] The first acquisition unit 21 is used to acquire a first influencing factor on the oilfield production rate in an oil well failure scenario, a second influencing factor on the oilfield production rate during a well repair operation, and a third influencing factor on the oilfield production rate after the failed oil well is repaired;

[0099] The second acquisition unit 22 is used to acquire the total production time rate of the oil field when the oil well fails or when the well is repaired.

[0100] The second acquisition unit 22 is used to obtain the total production time rate of the oil field during oil well failure and well repair, including:

[0101] The second acquisition unit is used to weight the first influencing factor using the number of failed oil wells to obtain a first weighted result;

[0102] The third influencing factor is weighted by the number of well repairs to obtain the second weighted result;

[0103] The production time rate of the second oil field is obtained according to the initial production time rate, the first weighted result, the second weighted result and the second influencing factor.

[0104] Those skilled in the art should understand that although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible to modify the technical solutions described in the aforementioned embodiments, or to make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for characterizing oil well failure and well repair in a reservoir numerical simulation model, characterized in that: The method comprises: Determine the field's initial production rate, well failure frequency, and workover frequency; Obtaining the total production time rate of the oil field during oil well failure and workover according to the initial production time rate, oil well failure frequency, and workover operation frequency; The total production time rate of the oil field is substituted into the reservoir numerical simulation model to characterize oil well failure and well repair.

2. The method for characterizing oil well failure and well repair in a reservoir numerical simulation model according to claim 1, characterized in that: According to the initial production time rate, oil well failure frequency and well repair operation frequency, the total production time rate of the oil field during oil well failure and well repair is obtained, including: Obtain the first influencing factor on the oilfield production rate in the oil well failure scenario, the second influencing factor on the oilfield production rate during the well repair operation, and the third influencing factor on the oilfield production rate after the failed oil well is repaired; The total production time rate of the oil field during oil well failure and well repair is obtained according to the first influencing factor, the second influencing factor and the third influencing factor.

3. The method for characterizing oil well failure and well repair in a reservoir numerical simulation model according to claim 2, characterized in that: Obtaining the first impact factor includes: The first impact factor is obtained based on the number of normally producing oil wells and the number of artificial islands where the oil field is located.

4. The method for characterizing oil well failure and well repair in a reservoir numerical simulation model according to claim 2, characterized in that: Obtaining the second impact factor includes: The second impact factor is obtained based on the number of normally producing oil wells, the number of artificial islands where the oil field is located, and the number of construction days required to repair each oil well.

5. The method for characterizing oil well failure and well repair in a reservoir numerical simulation model according to claim 3, characterized in that: Obtaining the third impact factor includes: The third impact factor is obtained by taking the opposite value of the first impact factor.

6. The method for characterizing oil well failure and well repair in a reservoir numerical simulation model according to claim 5, characterized in that: The method for obtaining the total production time rate of the oil field includes: The first influencing factor is weighted by the number of failed oil wells to obtain a first weighted result; The third influencing factor is weighted by the number of well repairs to obtain the second weighted result; The total production time rate of the oil field is obtained according to the initial production time rate, the first weighted result, the second weighted result and the second influencing factor.

7. A system for characterizing oil well failure and workover in a reservoir numerical simulation model, characterized in that: The system comprises: A determination module for determining the initial production rate of an oil field, the frequency of well failures, and the frequency of workover operations; An acquisition module is used to obtain the total production time rate of the oil field during oil well failure and workover; Characterization module, used to characterize oil well failure and well repair.

8. The system for characterizing oil well failure and well repair in a reservoir numerical simulation model according to claim 7, characterized in that: The acquisition module includes a first acquisition unit and a second acquisition unit; The first acquisition unit is used to acquire a first influencing factor on the oil field production rate in an oil well failure scenario, a second influencing factor on the oil field production rate during a well repair operation, and a third influencing factor on the oil field production rate after the failed oil well is repaired; The second acquisition unit is used to acquire the total production time rate of the oil field when the oil well fails and the well is repaired.

9. The system for characterizing oil well failure and well repair in a reservoir numerical simulation model according to claim 8, characterized in that: The first acquisition unit is used to obtain a first influencing factor on the oil field production time rate in an oil well failure scenario, including: The first acquisition unit is used to obtain a first impact factor according to the number of normally producing oil wells and the number of artificial islands where the oil field is located.

10. The system for characterizing oil well failure and well repair in a reservoir numerical simulation model according to claim 9, characterized in that: The first acquisition unit is used to acquire a second influencing factor on the oil field production rate during the well repair operation, including: The first acquisition unit is used to obtain the second impact factor according to the number of normally producing oil wells, the number of artificial islands where the oil field is located, and the number of construction days required to repair each oil well.

11. The system for characterizing oil well failure and well repair in a reservoir numerical simulation model according to claim 10, wherein: The first acquisition unit is used to obtain a third influencing factor on the oil field production rate after the failed oil well is repaired, including: The first acquisition unit is configured to obtain the third impact factor by taking the inverse value of the first impact factor.

12. The system for characterizing oil well failure and well repair in a reservoir numerical simulation model according to claim 11, characterized in that: The second acquisition unit is used to obtain the total production time rate of the oil field during oil well failure and well repair, including: The second acquisition unit is used to weight the first influencing factor using the number of failed oil wells to obtain a first weighted result; The third influencing factor is weighted by the number of well repairs to obtain the second weighted result; The production time rate of the second oil field is obtained according to the initial production time rate, the first weighted result, the second weighted result and the second influencing factor.

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