A method and device for identifying low efficiency and invalid cycles

Abstract

The application provides a low-efficiency and invalid cycle field identification method, comprising the following steps: obtaining the injection pressure and the water absorption index of the injection well layer when the injection multiple and the cumulative injection intensity of the injection well layer reach a threshold value; obtaining the relative water absorption amount of the injection well layer when the injection pressure does not reach the threshold value and the water absorption index reaches the threshold value; determining the injection well layer as the low-efficiency and invalid layer of the injection well when the relative water absorption amount reaches the threshold value; obtaining the water cut and the cumulative liquid production intensity of the oil well layer corresponding to the low-efficiency and invalid layer of the injection well; obtaining the water cut and the liquid production amount of the oil well sub-layer in the oil well layer when the water cut and the cumulative liquid production intensity of the oil well layer reach the threshold value; obtaining the relative liquid production amount of the oil well layer when the water cut and the liquid production amount of the oil well sub-layer reach the threshold value; and determining the oil well layer as the low-efficiency and invalid layer of the oil well when the relative liquid production amount reaches the threshold value. The application has high identification precision, avoids the problem that the identification result is greatly influenced by human experience, and improves the identification efficiency and accuracy.

Description

Technical Field

[0001] This invention relates to the field of petroleum geological exploration technology, and in particular to a method and apparatus for identifying inefficient and ineffective circulating fields. Background Technology

[0002] Inefficient and ineffective circulation is a common development phenomenon in continental sedimentary oilfields during the medium-to-high water-cut development stage. As the water cut of the oilfield continues to increase and the liquid-to-oil ratio rises rapidly, inefficient and ineffective circulation in water-drive becomes increasingly prominent, seriously affecting the development effect and economic benefits of the oilfield. Currently, commonly used methods for identifying inefficient and ineffective circulation fields mainly rely on manual analysis, which is labor-intensive, inefficient, and the identification results are greatly affected by human experience, resulting in poor accuracy. Summary of the Invention

[0003] To address the problems of low efficiency, significant reliance on human experience, and poor accuracy of conventional, inefficient, and invalid cyclic field identification methods, this invention provides an inefficient invalid cyclic field identification method, apparatus, device, and storage medium that offers high precision, speed, efficiency, and accuracy.

[0004] This invention provides a method for identifying inefficient and invalid cyclic fields, comprising:

[0005] Obtain the water injection ratio and cumulative water injection intensity of the injection well formation;

[0006] When the water injection ratio reaches the first threshold and the cumulative water injection intensity reaches the second threshold, the water injection pressure and water absorption index of the water injection well layer are obtained.

[0007] When the water injection pressure does not reach the third threshold and the water absorption index reaches the fourth threshold, the relative water absorption of the water injection well layer is obtained;

[0008] When the relative water absorption of the injection well layer reaches the fifth threshold, the injection well layer is determined to be an inefficient and ineffective injection well layer.

[0009] The oil well layer to be identified is determined based on the connectivity between the water injection well layer and the oil well layer, and the oil well layer is determined to be the inefficient and ineffective layer of the water injection well.

[0010] Obtain the water cut and cumulative production intensity of the oil well formation to be identified;

[0011] When the water cut reaches the sixth threshold and the cumulative production intensity reaches the seventh threshold, the water cut and production volume of the oil well sub-layer within the oil well layer are obtained;

[0012] When the water cut of the oil well sub-layer reaches the eighth threshold and the production of the oil well sub-layer reaches the ninth threshold, the relative production of the oil well layer is obtained.

[0013] If the relative production rate of the oil well layer reaches the tenth threshold, the oil well layer is determined to be an inefficient and ineffective layer for oil production.

[0014] Optionally, obtaining the relative water absorption of the injection well layer when the injection pressure does not reach the third threshold and the water absorption index reaches the fourth threshold includes:

[0015] When the water injection pressure does not reach the third threshold and the water absorption index reaches the fourth threshold, the water nozzle of the sub-layer of the water injection well in the water injection well layer and the water absorption index of the sub-layer are obtained.

[0016] When the water inlet of the injection well reaches the eleventh threshold and the water absorption index of the injection well reaches the twelfth threshold, the relative water absorption of the injection well layer is obtained.

[0017] Optionally, the method further includes:

[0018] The location, position, and direction of the inefficient and ineffective circulation in the inefficient and ineffective layer of the oil well are determined based on the sub-layer of the oil well where the water cut reaches the eighth threshold and the production volume reaches the ninth threshold.

[0019] Optionally, the method further includes:

[0020] The water injection ratio of the water injection well layer when the water cut of the oil well layer reaches the sixth threshold is determined as the first threshold.

[0021] Optionally, the method further includes:

[0022] The average cumulative water injection intensity or its multiple within the same layer of the injection well block is determined as the second threshold, and the average cumulative fluid production intensity or its multiple within the same layer of the oil well block is determined as the seventh threshold.

[0023] Optionally, the method further includes:

[0024] The average water injection pressure of wells in the same layer within the block where the water injection well layer is located is determined as the third threshold.

[0025] Optionally, the method further includes:

[0026] When the thickness of the water injection well layer is 2 meters or more, the fifth threshold is 20%; when the thickness of the water injection well layer is less than 2 meters, the fifth threshold is 10%. When the thickness of the oil well layer is 2 meters or more, the tenth threshold is 20%; when the thickness of the oil well layer is less than 2 meters, the tenth threshold is 10%.

[0027] This invention also provides an inefficient invalid cyclic field identification device, comprising:

[0028] The first acquisition unit acquires the water injection ratio and cumulative water injection intensity of the water injection well layer;

[0029] The second acquisition unit acquires the water injection pressure and water absorption index of the water injection well layer when the water injection ratio reaches the first threshold and the cumulative water injection intensity reaches the second threshold.

[0030] The third acquisition unit acquires the relative water absorption of the injection well layer when the water injection pressure does not reach the third threshold and the water absorption index reaches the fourth threshold.

[0031] The first determining unit determines the water injection well layer as an inefficient and ineffective water injection well layer when the relative water absorption of the water injection well layer reaches the fifth threshold.

[0032] The second determining unit determines the oil well layer to be identified corresponding to the inefficient and ineffective layer of the water injection well based on the connection relationship between the water injection well layer and the oil well layer.

[0033] The fourth acquisition unit acquires the water cut and cumulative production intensity of the oil well layer to be identified;

[0034] The fifth acquisition unit acquires the water cut and production volume of the oil well sub-layer within the oil well layer when the water cut reaches the sixth threshold and the cumulative production intensity reaches the seventh threshold.

[0035] The sixth acquisition unit acquires the relative production of the oil well layer when the water cut of the oil well sub-layer reaches the eighth threshold and the production of the oil well sub-layer reaches the ninth threshold.

[0036] The third determining unit determines the oil well layer as an inefficient and ineffective oil production layer when the relative production rate of the oil well layer reaches the tenth threshold.

[0037] This invention also provides a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement any of the methods described above.

[0038] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements any of the methods described above.

[0039] The beneficial effects of this invention are as follows:

[0040] The inefficient and invalid cyclic field identification method, apparatus, device and storage medium provided in the embodiments of the present invention have high identification accuracy, avoid the problem that the identification results are greatly affected by human experience, and improve identification efficiency and accuracy. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 The diagram shown is a flowchart of the inefficient and invalid cyclic field identification method provided in an embodiment of the present invention.

[0043] Figure 2 The diagram shown illustrates the relationship between the water injection ratio of the thick water injection well layer and the water cut and recovery rate of the oil well layer in an embodiment of the present invention.

[0044] Figure 3 The diagram shown illustrates the relationship between the water injection ratio of the thin water injection well layer and the water cut and recovery rate of the oil well layer in an embodiment of the present invention.

[0045] Figure 4 The diagram shown is a structural schematic of the inefficient and invalid cyclic field identification device provided in an embodiment of the present invention. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0047] Currently, commonly used inefficient and invalid cyclic field identification methods mainly rely on manual analysis, which is labor-intensive, inefficient, and the identification results are greatly affected by human experience, resulting in poor accuracy.

[0048] Through extensive experimentation and innovative work, the inventors of this invention discovered the parameters and relationships between water injection well layers and oil well layers that affect the efficiency and accuracy of identifying inefficient and ineffective circulating fields. Based on this research, they creatively proposed specific technical solutions.

[0049] Specifically, embodiments of the present invention provide a method, apparatus, device, storage medium, and program product for identifying inefficient and ineffective circulating fields. These methods can quickly identify inefficient and ineffective layers in water injection wells and oil production wells, and possess high identification accuracy. They avoid the problem of identification results being significantly influenced by human experience, thus improving identification efficiency and accuracy. The inefficient and ineffective circulating field identification method, apparatus, device, storage medium, and program product provided by embodiments of the present invention can be applied to, for example... Figure 1 In the scenario shown, for example, it is used for the identification of inefficient and ineffective circulating fields in heterogeneous sandstone oilfields.

[0050] Example 1:

[0051] Please see Figure 1 An embodiment of the present invention provides an inefficient and invalid cyclic field identification method, comprising:

[0052] Step S101: Obtain the water injection ratio and cumulative water injection intensity of the injection well layer;

[0053] In this embodiment, the water injection ratio = cumulative water injection volume / underground pore volume controlled by the well group; the cumulative water injection intensity = cumulative water injection volume / oil layer thickness perforated by the water well.

[0054] Step S102: When the water injection ratio reaches the first threshold and the cumulative water injection intensity reaches the second threshold, obtain the water injection pressure and water absorption index of the water injection well layer.

[0055] Step S103: If the water injection pressure does not reach the third threshold and the water absorption index reaches the fourth threshold, obtain the relative water absorption of the water injection well layer.

[0056] Step S104: If the relative water absorption of the injection well layer reaches the fifth threshold, the injection well layer is determined to be an inefficient and ineffective injection well layer.

[0057] Step S105: Determine the oil well layer to be identified corresponding to the inefficient and ineffective layer of the water injection well based on the connection relationship between the water injection well layer and the oil well layer;

[0058] Step S106: Obtain the water cut and cumulative production intensity of the oil well formation to be identified;

[0059] Step S107: When the water cut reaches the sixth threshold and the cumulative production intensity reaches the seventh threshold, obtain the water cut and production volume of the oil well sub-layer within the oil well layer;

[0060] Step S108: When the water cut of the oil well sub-layer reaches the eighth threshold and the production of the oil well sub-layer reaches the ninth threshold, obtain the relative production of the oil well layer.

[0061] Step S109: If the relative production rate of the oil well layer reaches the tenth threshold, the oil well layer is determined to be an inefficient and ineffective layer for oil production.

[0062] Example 2:

[0063] Another embodiment of the present invention provides an inefficient and invalid cyclic field identification method, which, based on the identification method provided in Embodiment 1, further includes step S203 as follows:

[0064] Step S2031: If the water injection pressure does not reach the third threshold and the water absorption index reaches the fourth threshold, obtain the water nozzle of the sub-layer of the water injection well in the water injection well layer and the water absorption index of the sub-layer.

[0065] Step S2032: When the water nozzle of the injection well reaches the eleventh threshold and the water absorption index of the injection well reaches the twelfth threshold, the relative water absorption of the injection well layer is obtained.

[0066] Example 3:

[0067] Another embodiment of the present invention provides an inefficient and invalid cyclic field identification method, which, based on the identification method provided in any of the above embodiments, further includes:

[0068] Step S410: Determine the layer position, location, and direction of the inefficient and ineffective circulation of the inefficient and ineffective layer of the oil well based on the oil well sub-layer where the water cut reaches the eighth threshold and the production volume reaches the ninth threshold.

[0069] According to this embodiment, inefficient and ineffective circulation layers in oil wells can be identified within the layers, thereby accurately determining the layer location, position, and direction of inefficient and ineffective circulation, and thus accurately determining the distribution of the inefficient and ineffective circulation field, especially for oil layers with a large thickness.

[0070] Example 4:

[0071] Another embodiment of the present invention provides an inefficient and invalid cyclic field identification method, which, based on the identification method provided in any of the above embodiments, further includes:

[0072] The water injection ratio of the water injection well layer when the water cut of the oil well layer reaches the sixth threshold is determined as the first threshold.

[0073] Generally, as water is continuously injected into the injection well, the recovery rate of the oil well will significantly increase. However, the inventors of this invention have discovered that when the water cut of the oil well reaches a certain value, continued water injection will not significantly improve the recovery rate. This value is the water cut threshold of the oil well, which is referred to as the sixth threshold in this embodiment of the invention.

[0074] To better understand the embodiments of the present invention, the determination of the water cut threshold (i.e., the sixth threshold) of the oil well layer and the water injection multiple threshold (i.e., the first threshold) of the water well layer are illustrated below.

[0075] First, it should be noted that, in this field, based on layer thickness, the water injection well layer and the oil well layer are respectively classified as thick layers and thin layers. That is, the water injection well layer with a thickness of 2 meters or more is called a thick water injection well layer, and the water injection well layer with a thickness of less than 2 meters is called a thin water injection well layer; similarly, the oil well layer with a thickness of 2 meters or more is called a thick oil well layer, and the oil well layer with a thickness of less than 2 meters is called a thin oil well layer.

[0076] Please see Figure 2 In one embodiment, the injection well layer is a thick injection well layer. When the water cut of the oil well layer reaches 98%, the recovery rate of the oil well layer reaches 47%, and the water injection ratio of the injection well layer is 3.2 PV. Subsequent injection of water into the injection well layer does not significantly improve the recovery rate of the oil well layer. In this embodiment, 98% is the water cut threshold of the oil well layer, which is the sixth threshold; 3.2 PV is the water injection ratio threshold of the injection well layer, which is the first threshold.

[0077] Please see Figure 3 In another embodiment, the injection well layer is a thin injection well layer. When the water cut of the oil well layer reaches 98%, the recovery rate of the oil well layer reaches 41%, and the water injection ratio of the injection well layer is 4.7 PV. Subsequent injection of water into the injection well layer does not significantly improve the recovery rate of the oil well layer. In this embodiment, 98% is the water cut threshold of the oil well layer, which is the sixth threshold; 4.7 PV is the water injection ratio threshold of the injection well layer, which is the first threshold.

[0078] Example 5:

[0079] Another embodiment of the present invention provides an inefficient and invalid cyclic field identification method, which, based on the identification method provided in any of the above embodiments, further includes:

[0080] The average cumulative water injection intensity or its multiple within the same layer of the injection well block is determined as the second threshold, and the average cumulative fluid production intensity or its multiple within the same layer of the oil well block is determined as the seventh threshold.

[0081] In this embodiment, "wells in the same layer" refers to oil and water wells that develop the same oil layer. "Block" refers to the block unit where all wells requiring identification are located.

[0082] Example 6:

[0083] Another embodiment of the present invention provides an inefficient and invalid cyclic field identification method, which, based on the identification method provided in any of the above embodiments, further includes:

[0084] The average water injection pressure of wells in the same layer within the block where the water injection well layer is located is determined as the third threshold.

[0085] Example 7:

[0086] Another embodiment of the present invention provides an inefficient and invalid cyclic field identification method, which, based on the identification method provided in any of the above embodiments, further includes:

[0087] When the thickness of the water injection well layer is 2 meters or more, the fifth threshold is 20%; when the thickness of the water injection well layer is less than 2 meters, the fifth threshold is 10%. When the thickness of the oil well layer is 2 meters or more, the tenth threshold is 20%; when the thickness of the oil well layer is less than 2 meters, the tenth threshold is 10%.

[0088] The inventors of this invention have discovered through research that the relative water absorption of the injection well layer can be used to determine whether the injection well layer is an inefficient or ineffective layer. The determination criteria vary depending on whether the injection well layer is thick or thin. The thickness and thinness of the injection well layer have been described in Example 4 and will not be repeated here.

[0089] Specifically, when the injection well layer is thick, the fifth threshold is 20%; when the injection well layer is thin, the fifth threshold is 10%.

[0090] The inventors of this invention have discovered through research that the relative production rate of the oil well layer can be used to determine whether the oil well layer is an inefficient or ineffective layer. The criteria for this determination vary depending on whether the oil well layer is thick or thin. The descriptions of thick and thin oil well layers have been provided in Example 4 and will not be repeated here.

[0091] Specifically, when the oil well layer is thick, the tenth threshold is 20%; when the oil well layer is thin, the tenth threshold is 10%.

[0092] Based on the same inventive concept as the above embodiments, the present invention also proposes the following embodiments, wherein the same technical terms have been defined, explained and / or exemplified above, and will not be repeated in the following embodiments.

[0093] Based on this embodiment, its practical application is as follows:

[0094] The implementation area is the eastern section of the South Third District, with an area of ​​14.2 km². 2 A total of 282 wells were drilled. The criteria for identifying inefficient and ineffective circulating fields in the block were: water cut 96.07%, water injection ratio 2.39 PV, and cumulative water injection intensity 2.91 × 10⁻⁶. 4 m 3 / m, cumulative liquid production intensity 1.45×10 4 m 3 / m, apparent water absorption index of a single well is 5.62m 3 / d.Mpa. Based on the identification criteria, a single click quickly identified 91 sedimentary units from 65 wells, accounting for 23.0% of the total, with a sandstone thickness of 110.5m and an effective thickness of 63.2m. The distribution scale and morphology of inefficient and ineffective circulation were accurately depicted in profile, planar, and three-dimensional dimensions.

[0095] Additionally: The implementation area is the South-Central-West Zone 2, with an area of ​​12.3 km². 2 A total of 426 wells were drilled. The criteria for identifying inefficient and ineffective circulating fields in the block were: water cut 97.29%, water injection ratio 1.93 PV, and cumulative water injection intensity 0.45 × 10⁻⁶. 4 m 3 / m, cumulative liquid production intensity 0.63×10 4 m 3 / m, apparent water absorption index of a single well is 6.52m 3 / d.Mpa. Based on the identification criteria, a single click quickly identified 307 sedimentary units from 160 wells, representing 37.6% of the total, with a sandstone thickness of 854.5m and an effective thickness of 675.5m. The distribution scale and morphology of inefficient and ineffective circulation were accurately depicted in profile, planar, and three-dimensional dimensions.

[0096] Example 8:

[0097] Please see Figure 4 Another embodiment of the present invention provides an inefficient invalid cyclic field identification device 400, comprising:

[0098] The first acquisition unit 401 acquires the water injection ratio and cumulative water injection intensity of the water injection well layer;

[0099] The second acquisition unit 402 acquires the water injection pressure and water absorption index of the water injection well layer when the water injection ratio reaches the first threshold and the cumulative water injection intensity reaches the second threshold.

[0100] The third acquisition unit 403 acquires the relative water absorption of the injection well layer when the water injection pressure does not reach the third threshold and the water absorption index reaches the fourth threshold.

[0101] The first determining unit 404 determines the water injection well layer as an inefficient and ineffective water injection well layer when the relative water absorption of the water injection well layer reaches the fifth threshold.

[0102] The second determining unit 405 determines the oil well layer to be identified corresponding to the inefficient and ineffective layer of the water injection well based on the connection relationship between the water injection well layer and the oil well layer.

[0103] The fourth acquisition unit 406 acquires the water cut and cumulative fluid production intensity of the oil well layer to be identified;

[0104] The fifth acquisition unit 407 acquires the water cut and production volume of the oil well sub-layer within the oil well layer when the water cut reaches the sixth threshold and the cumulative production intensity reaches the seventh threshold.

[0105] The sixth acquisition unit 408 acquires the relative production of the oil well layer when the water cut of the oil well sub-layer reaches the eighth threshold and the production of the oil well sub-layer reaches the ninth threshold.

[0106] The third determining unit 409 determines the oil well layer as an inefficient and ineffective oil well layer when the relative production rate of the oil well layer reaches the tenth threshold.

[0107] Example 9:

[0108] Another embodiment of the present invention provides an inefficient invalid cyclic field identification device, which, based on the identification device provided in Embodiment 8, further includes, in the third acquisition unit:

[0109] The first acquisition subunit acquires the water nozzle of the water injection well sub-layer and the water absorption index of the sub-layer within the water injection well layer when the water injection pressure does not reach the third threshold and the water absorption index reaches the fourth threshold.

[0110] The second acquisition subunit acquires the relative water absorption of the injection well layer when the water nozzle of the layer reaches the eleventh threshold and the water absorption index of the layer reaches the twelfth threshold.

[0111] Example 10:

[0112] Based on another embodiment of the present invention, it further includes:

[0113] The fourth determining unit determines the layer, location, and direction of the inefficient and ineffective circulation of the inefficient and ineffective layer of the oil well based on the oil well sub-layer where the water cut reaches the eighth threshold and the production volume reaches the ninth threshold.

[0114] Example 11:

[0115] Another embodiment of the present invention provides an inefficient invalid cyclic field identification device, which, based on the identification device provided in any of the above embodiments, further includes:

[0116] The water injection ratio of the water injection well layer when the water cut of the oil well layer reaches the sixth threshold is determined as the first threshold.

[0117] Example 12:

[0118] Another embodiment of the present invention provides an inefficient invalid cyclic field identification device, which, based on the identification device provided in any of the above embodiments, further includes:

[0119] The average cumulative water injection intensity or its multiple within the same layer of the injection well block is determined as the second threshold, and the average cumulative fluid production intensity or its multiple within the same layer of the oil well block is determined as the seventh threshold.

[0120] Example 13:

[0121] Another embodiment of the present invention provides an inefficient invalid cyclic field identification device, which, based on the identification device provided in any of the above embodiments, further includes:

[0122] The average water injection pressure of wells in the same layer within the block where the water injection well layer is located is determined as the third threshold.

[0123] Example 14:

[0124] Another embodiment of the present invention provides an inefficient invalid cyclic field identification device, which, based on the identification device provided in any of the above embodiments, further includes:

[0125] When the thickness of the water injection well layer is 2 meters or more, the fifth threshold is 20%; when the thickness of the water injection well layer is less than 2 meters, the fifth threshold is 10%. When the thickness of the oil well layer is 2 meters or more, the tenth threshold is 20%; when the thickness of the oil well layer is less than 2 meters, the tenth threshold is 10%.

[0126] Another embodiment of the present invention provides a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method provided in any one of the embodiments one to seven above.

[0127] The computer device can specifically be a desktop computer, portable computer, smartphone, tablet computer, personal digital assistant (PDA), etc. Specifically, the computer device 1000 described in this embodiment of the invention may include a central processing unit (CPU) 1002, a memory 1001, an input device 1003, and an output device 1004, etc. The input device 1003 may include a keyboard, mouse, touch screen, etc., and the output device 1004 may include a display device, such as a liquid crystal display (LCD) or a cathode ray tube (CRT), etc.

[0128] The memory may include read-only memory (ROM) and random access memory (RAM), and provides the central processing unit with program instructions and data stored in the memory. In embodiments of the present invention, the memory may be used for the program of an inefficient invalid cycle field identification method.

[0129] The central processing unit (CPU) can execute the method steps provided in any of the embodiments 1 to 7 above by calling program instructions stored in memory.

[0130] The inefficient invalid cyclic field identification method, apparatus, device, storage medium, and program product provided by the above embodiments of the present invention have high identification accuracy, avoid the problem that the identification results are greatly affected by human experience, and improve identification efficiency and accuracy.

[0131] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0132] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for identifying low and no efficiency cycle fields, characterized by, The method comprises the following steps: obtaining the injection multiple and the cumulative injection intensity of the injection well layer; in the case that the injection multiple reaches a first threshold value and the cumulative injection intensity reaches a second threshold value, obtaining the injection pressure and the water absorption index of the injection well layer; in the case that the injection pressure does not reach a third threshold value and the water absorption index reaches a fourth threshold value, obtaining the relative water absorption amount of the injection well layer, which specifically comprises: in the case that the injection pressure does not reach a third threshold value and the water absorption index reaches a fourth threshold value, obtaining the layer section water nozzle and the layer section water absorption index of the injection well sub-layer in the injection well layer; in the case that the layer section water nozzle reaches an eleventh threshold value and the layer section water absorption index reaches a twelfth threshold value, obtaining the relative water absorption amount of the injection well layer; determining the injection well layer as an injection well low-efficiency and ineffective layer in the case that the relative water absorption amount of the injection well layer reaches a fifth threshold value; determining the to-be-identified oil well layer corresponding to the injection well low-efficiency and ineffective layer according to the communication relationship between the injection well layer and the oil well layer; obtaining the water cut and the cumulative liquid production intensity of the to-be-identified oil well layer; in the case that the water cut reaches a sixth threshold value and the cumulative liquid production intensity reaches a seventh threshold value, obtaining the water cut and the liquid production amount of the oil well sub-layer in the oil well layer; in the case that the water cut of the oil well sub-layer reaches an eighth threshold value and the liquid production amount of the oil well sub-layer reaches a ninth threshold value, obtaining the relative liquid production amount of the oil well layer; determining the oil well layer as an oil production well low-efficiency and ineffective layer in the case that the relative liquid production amount of the oil well layer reaches a tenth threshold value.

2. The method of claim 1, wherein, The method comprises the following steps: determining the position, part and direction of the low-efficiency and ineffective cycle of the oil production well low-efficiency and ineffective layer according to the oil well sub-layer in which the water cut reaches the eighth threshold value and the liquid production amount reaches the ninth threshold value in the oil production well low-efficiency and ineffective layer.

3. The method of claim 2, wherein, The method comprises the following steps: determining the injection multiple of the injection well layer when the water cut of the oil well layer reaches the sixth threshold value as the first threshold value.

4. The method of claim 2, wherein, The method comprises the following steps: determining the average cumulative injection intensity or the multiple of the same layer system well in the block where the injection well layer is located as the second threshold value, and determining the average cumulative liquid production intensity or the multiple of the same layer system well in the block where the oil well layer is located as the seventh threshold value.

5. The method of claim 2, wherein, The method comprises the following steps: determining the average injection pressure of the same layer system well in the block where the injection well layer is located as the third threshold value.

6. The method of claim 2, wherein, The method comprises the following steps: in the case that the thickness of the injection well layer is 2 meters or more, the fifth threshold value is 20%, and in the case that the thickness of the injection well layer is less than 2 meters, the fifth threshold value is 10%; in the case that the thickness of the oil well layer is 2 meters or more, the tenth threshold value is 20%, and in the case that the thickness of the oil well layer is less than 2 meters, the tenth threshold value is 10%.

7. A low efficiency invalid cycle field identification device characterized by, The method comprises the following steps: a first obtaining unit, which obtains the injection multiple and the cumulative injection intensity of the injection well layer; a second obtaining unit, which obtains the injection pressure and the water absorption index of the injection well layer in the case that the injection multiple reaches a first threshold value and the cumulative injection intensity reaches a second threshold value; a third obtaining unit, which obtains the relative water absorption amount of the injection well layer in the case that the injection pressure does not reach a third threshold value and the water absorption index reaches a fourth threshold value; The first determining unit determines the water injection well layer as a low-efficiency and ineffective water injection well layer when the relative water absorption amount of the water injection well layer reaches a fifth threshold value; The second determining unit determines a to-be-identified oil well layer corresponding to the low-efficiency and ineffective water injection well layer according to the connection relationship between the water injection well layer and the oil well layer; The third obtaining unit further includes: The first obtaining sub-unit obtains a layer section water nozzle and a layer section water absorption index of a water injection well sub-layer in the water injection well layer when the water injection pressure does not reach a third threshold value and the water absorption index reaches a fourth threshold value; The second obtaining sub-unit obtains a relative water absorption amount of the water injection well layer when the layer section water nozzle reaches an eleventh threshold value and the layer section water absorption index reaches a twelfth threshold value; The fourth obtaining unit obtains a water cut and a cumulative liquid production intensity of the to-be-identified oil well layer; The fifth obtaining unit obtains a water cut and a liquid production amount of an oil well sub-layer in the oil well layer when the water cut reaches a sixth threshold value and the cumulative liquid production intensity reaches a seventh threshold value; The sixth obtaining unit obtains a relative liquid production amount of the oil well layer when the water cut of the oil well sub-layer reaches an eighth threshold value and the liquid production amount of the oil well sub-layer reaches a ninth threshold value; The third determining unit determines the oil well layer as a low-efficiency and ineffective oil production well layer when the relative liquid production amount of the oil well layer reaches a tenth threshold value.

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