Horizontal well multi-stage testing analysis method and device for thief zone containing reservoir

Abstract

The application discloses a horizontal well multi-section well testing analysis method and device for thief zone-containing reservoirs, and relates to the field of well testing analysis. The method comprises the following steps: acquiring a well testing pressure derivative curve of a horizontal well in a thief zone-containing reservoir; classifying and interpreting the well testing pressure derivative curve according to whether the horizontal well trajectory passes through the thief zone, so as to acquire physical property parameters of the formation around the horizontal well; discretizing a completion section of the horizontal well into multiple independent liquid production units; under the limitation of the physical property parameters, performing liquid production volume inversion on the discrete liquid production units, and performing multiple times of fitting between a well testing pressure derivative curve formed by combination of each liquid production unit and a measured well testing pressure derivative curve until a fitting degree reaches a preset fitting value; determining a production-injection profile of the horizontal well according to the combination of the liquid production units corresponding to the well testing pressure derivative curve; and performing interference well testing interpretation on water injection wells in a well group in which the horizontal well is located in sequence, so as to determine a water inflow direction of the production well. The application can realize multi-section well testing analysis of multi-section horizontal wells in thief zone-containing reservoirs.

Description

Technical Field

[0001] This invention relates to the field of oil and gas extraction technology, and in particular to a multi-stage well test analysis system and method for horizontal wells containing burrowing reservoirs. Background Technology

[0002] This section is intended to provide background or context for the embodiments of the invention set forth in the claims. The description herein is not an admission that it is prior art simply because it is included in this section.

[0003] Horizontal well testing analysis offers advantages such as convenient testing and low cost. The interpretation results effectively reflect the formation properties near the wellbore and the production situation in the horizontal section, making it a powerful monitoring tool for analyzing horizontal well conditions and reservoir development effectiveness. High-permeability layers, also known as "thief layers," refer to reservoir sections with significantly higher permeability than the surrounding rock, causing uneven production during development. Thief layers have different geological origins, such as differential compaction-dissolution fractures, dissolution cavities, bioturbation, differential sedimentation, and diagenesis in different environments. Compared to low-energy sedimentary surrounding rocks, high-energy sediments have better pore connectivity and higher permeability, resulting in significantly higher production during development. During development, the high production in thief layers leads to uneven reservoir utilization, negatively impacting water injection development. Injected water advances rapidly along the "thief layer," preventing effective displacement of oil and gas from the surrounding rock, while high-yield wells experience premature water breakthrough or water flooding, resulting in ineffective water circulation. For horizontal wells, due to well trajectory control issues, the actual well trajectory is not a straight horizontal line but rather an inclined trajectory with a certain degree of tortuosity. When the completion section crosses a "thief's layer," the producing section will concentrate in the "thief's layer," leading to rapid water flooding of the production well and poor development results. Therefore, it is necessary to propose a new method for multi-stage well testing analysis of horizontal wells in reservoirs containing thief's layers.

[0004] Several technologies have been developed to address the problem of uneven fluid production in horizontal wells. These include diagnostic methods for the oil (gas) production location of multi-stage fractured horizontal wells, and analytical control systems and methods for identifying segmented fluid production in horizontal wells. The latter proposes an analytical solution for pressure changes in multi-stage fluid-producing horizontal wells, and uses this expression to conduct well test interpretation and fluid production segment identification. Existing technologies also provide a pressure monitoring method for determining the water inflow direction in non-uniform fluid-producing horizontal wells. By designing interference well tests between non-uniform fluid-producing horizontal wells and surrounding water injection wells in an injection-production well network of vertical wells and horizontal wells, the connectivity between wells can be determined, and the water inflow direction can be identified. However, these methods mainly focus on well testing and fail to utilize reservoir dynamic data and monitoring information. Furthermore, these reservoirs are based on the fundamental assumption of homogeneity, neglecting the strong heterogeneity and the presence of "thieves" (or "black spots") in reservoirs. Currently, there is no multi-stage well test analysis scheme applicable to multi-stage horizontal wells containing "thieves." Summary of the Invention

[0005] In a first aspect, embodiments of the present invention provide a method for multi-stage well test analysis of horizontal wells in reservoirs containing burrowing formations, for realizing multi-stage well test analysis of multi-stage horizontal wells in reservoirs containing burrowing formations, the method comprising:

[0006] Obtain the well test pressure derivative curves of horizontal wells containing burrowing reservoirs;

[0007] Based on whether the horizontal well trajectory passes through the burrowing layer, the well test pressure derivative curve is classified and interpreted to obtain the physical property parameters of the formation surrounding the horizontal well.

[0008] The horizontal well completion section is discretized into multiple independent production units, each of which follows the horizontal well flow equation and boundary conditions.

[0009] Under the constraints of the physical property parameters, the production volume of discrete production units is inverted, and the well test pressure derivative curve formed by the combination of each production unit is fitted with the measured well test pressure derivative curve multiple times until the fitting degree reaches the preset fitting value.

[0010] The production and injection profile of the horizontal well is determined based on the combination of production units corresponding to the well test pressure derivative curve.

[0011] Interference well tests were conducted sequentially on the injection wells within the well group containing the horizontal well to determine the direction of water inflow to the production wells.

[0012] Secondly, embodiments of the present invention also provide a multi-stage well test analysis device for horizontal wells containing burrowing reservoirs, for realizing multi-stage well test analysis of multi-stage horizontal wells containing burrowing reservoirs, the device comprising:

[0013] The curve acquisition module is used to acquire the well test pressure derivative curves of horizontal wells containing burrowing reservoirs;

[0014] The classification and interpretation module is used to classify and interpret the well test pressure derivative curve based on whether the horizontal well trajectory passes through the burrowing formation, and to obtain the physical property parameters of the formation around the horizontal well.

[0015] The production unit discretization module is used to discretize the horizontal well completion section into multiple independent production units, where each production unit follows the horizontal well seepage equation and boundary conditions.

[0016] The inversion module is used to invert the production volume of discrete production units under the constraints of the physical property parameters, and to fit the test pressure derivative curve formed by the combination of each production unit with the measured test pressure derivative curve multiple times until the fitting degree reaches the preset fitting value.

[0017] The production and injection profile analysis module is used to determine the production and injection profile of a horizontal well based on the combination of production units corresponding to the well test pressure derivative curve.

[0018] The water inflow direction analysis module is used to perform interference well test interpretation on each injection well in the well group where the horizontal well is located, and to determine the water inflow direction of the production well.

[0019] Thirdly, embodiments of the present invention also provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above-described method for multi-stage well testing analysis of horizontal wells containing burrowing reservoirs.

[0020] Fourthly, embodiments of the present invention also provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for multi-stage well testing analysis of horizontal wells containing burrowing reservoirs.

[0021] Fifthly, embodiments of the present invention also provide a computer program product, the computer program product including a computer program, which, when executed by a processor, implements the above-described method for multi-stage well testing analysis of horizontal wells containing burrowing reservoirs.

[0022] In this embodiment of the invention, the well test pressure derivative curve of a horizontal well containing a burrowing reservoir is obtained; the well test pressure derivative curve is classified and interpreted according to whether the horizontal well trajectory passes through the burrowing reservoir, and the physical property parameters of the formation surrounding the horizontal well are obtained; the completion section of the horizontal well is discretized into multiple independent production units, wherein each production unit follows the horizontal well seepage equation and boundary conditions; under the constraints of the physical property parameters, the production volume of the discrete production units is inverted, and the well test pressure derivative curve formed by the combination of each production unit is fitted multiple times with the measured well test pressure derivative curve until the fitting degree reaches a preset fitting value; the production-injection profile of the horizontal well is determined according to the combination of production units corresponding to the well test pressure derivative curve; interference well test interpretation is performed sequentially on the injection wells in the well group where the horizontal well is located to determine the water inflow direction of the production wells. Compared with existing technologies that do not consider the presence of burrowing layers, the solution provided by this invention enables multi-stage well test analysis of horizontal wells in reservoirs containing burrowing layers. During the analysis, the well test pressure derivative curve is classified and interpreted according to whether the horizontal well trajectory passes through the burrowing layer, and the physical property parameters of the formation surrounding the horizontal well are obtained. Then, under the constraints of the physical property parameters, the production volume of discrete production units is inverted to obtain the well test pressure derivative curve formed by the combination of each production unit with a fitting degree reaching a preset fitting value. This allows for the accurate determination of the production and injection profile and the direction of water inflow of the horizontal well. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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. In the drawings:

[0024] Figure 1 This is a flowchart of a multi-stage well test analysis method for horizontal wells in reservoirs containing burrowing formations, as described in an embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram illustrating the principle of excluding well test pressure derivative curves containing interference sources in an embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the distorted well test pressure derivative curve in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of a homogeneous model in an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the numerical model in an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the discrete completion sections of a horizontal well in an embodiment of the present invention;

[0030] Figure 7 This is a permeability statistics chart of each sub-layer of the reservoir in an embodiment of the present invention;

[0031] Figure 8 This is a production dynamic curve diagram of production well 1116H in an embodiment of the present invention;

[0032] Figure 9 This is a diagram showing the pressure derivative curve of well test in production well 1116H in an embodiment of the present invention.

[0033] Figure 10 This is the inversion result of the production unit 1116H of the production well in this embodiment of the invention;

[0034] Figures 11-12 This is a schematic diagram illustrating the interference test of water injection wells within the well group where production well 1116H is located, as described in this embodiment of the invention.

[0035] Figure 13 This is a structural block diagram of a multi-stage well test analysis device for horizontal wells in reservoirs containing burrowing formations, according to an embodiment of the present invention.

[0036] Figure 14 This is a schematic diagram of a computer device in an embodiment of the present invention. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0038] Figure 1 This is a flowchart of a multi-stage well test analysis method for horizontal wells in reservoirs containing burrowing formations, as described in an embodiment of the present invention, including:

[0039] Step 101: Obtain the well test pressure derivative curve of the horizontal well containing the burrowing reservoir;

[0040] Step 102: Based on whether the horizontal well trajectory passes through the burrowing layer, classify and interpret the well test pressure derivative curve to obtain the physical property parameters of the formation surrounding the horizontal well.

[0041] Step 103: Discretize the horizontal well completion section into multiple independent production units, wherein each production unit follows the horizontal well flow equation and boundary conditions;

[0042] Step 104: Under the constraints of the physical property parameters, the production volume of the discrete production units is inverted, and the well test pressure derivative curve formed by the combination of each production unit is fitted with the measured well test pressure derivative curve multiple times until the fitting degree reaches the preset fitting value.

[0043] Step 105: Determine the production and injection profile of the horizontal well based on the combination of production units corresponding to the well test pressure derivative curve;

[0044] Step 106: Conduct interference well test interpretations on each injection well in the well group containing the horizontal well to determine the water inflow direction of the production well.

[0045] In this embodiment of the invention, compared with the prior art which does not consider the case of the thief layer, the solution provided by this embodiment of the invention realizes multi-stage well test analysis for horizontal wells in reservoirs containing thief layers. During the analysis process, the well test pressure derivative curve is classified and interpreted according to whether the horizontal well trajectory passes through the thief layer, and the physical property parameters of the formation around the horizontal well are obtained. Then, under the constraint of the physical property parameters, the production volume of discrete production units is inverted to obtain the well test pressure derivative curve formed by the combination of each production unit with a fitting degree reaching the preset fitting value. Thus, the production injection profile and water inflow direction of the horizontal well can be accurately determined.

[0046] In step 101, the well test pressure derivative curve of the horizontal well containing the burrowing reservoir is obtained. To improve the accuracy of the obtained well test pressure derivative curve, it is also necessary to diagnose the pressure derivative curve. In one embodiment, after obtaining the well test pressure derivative curve of the horizontal well containing the burrowing reservoir, the following steps are also included:

[0047] First, analyze the anomalies in the well test pressure derivative curves of horizontal wells in reservoirs containing burrowing layers, and eliminate well test pressure derivative curves containing interference sources. Figure 2 This is a schematic diagram illustrating the principle of excluding well test pressure derivative curves containing interference sources in an embodiment of the present invention. (See attached diagram) Figure 2 The determined well test pressure derivative curve containing interference sources is divided into the wellbore storage stage and the linear flow stage.

[0048] Second, well pressure derivative curves of wells whose well test curve quality distortion exceeds a preset threshold are excluded. Figure 3 This is a schematic diagram of the distorted well test pressure derivative curve in an embodiment of the present invention, as shown below. Figure 3 As shown, the pressure derivative data points are scattered, the curve is severely distorted, and the semi-logarithmic curve indicates that the main source of interference is the wellbore.

[0049] In step 102, the well test pressure derivative curve is classified and interpreted according to whether the horizontal well trajectory passes through the burrowing layer, and the physical property parameters of the formation around the horizontal well are obtained.

[0050] In one embodiment, the well test pressure derivative curve is classified and interpreted according to whether the horizontal well trajectory passes through a burrowing formation, and the physical property parameters of the formation surrounding the horizontal well are obtained, including:

[0051] For horizontal wells whose trajectories cross the strata of a predetermined scale, a line segment with a pressure derivative slope of 1 / 2 is selected as the linear flow stage. The first well test interpretation model is used for well test interpretation to obtain the physical properties of the formation surrounding the horizontal well. The first well test interpretation model is a homogeneous model. Figure 4 This is a schematic diagram of a homogeneous model in an embodiment of the present invention, in which the horizontal well trajectory passes through the thief layer.

[0052] For horizontal wells whose overall trajectory lies above or below high-permeability layers, a line segment with a pressure derivative slope of 1 / 4 is selected as the linear flow stage. The second well test interpretation model is used to interpret the flow and obtain the physical properties of the formation surrounding the horizontal well. The second well test interpretation model is a numerical model. Figure 5 This is a schematic diagram of a numerical model in an embodiment of the present invention. In this model, the horizontal well trajectory is located above or below a high-permeability layer.

[0053] In one embodiment, the physical properties of the formation surrounding the horizontal well include one or any combination of the following: wellbore reservoir coefficient, skin coefficient, formation permeability, vertical permeability, horizontal permeability, effective length of the horizontal well, and investigation radius.

[0054] In one embodiment, the first well test interpretation model is a homogeneous model, and the second well test interpretation model is a numerical model.

[0055] In one embodiment, after obtaining the physical properties of the formation surrounding the horizontal well, the method further includes:

[0056] Forward modeling of the physical properties of the formation surrounding the horizontal well was performed. Based on the saturation monitoring results of the adjacent well zone, the accuracy of the flow field distribution of the well test interpretation model was verified to meet the preset precision.

[0057] If not, re-interpret the well test pressure derivative curves until the accuracy of the flow field distribution in the well test interpretation model reaches the preset precision.

[0058] In step 103, the horizontal well completion section is discretized into multiple independent production units, wherein each production unit follows the horizontal well flow equation and boundary conditions; Figure 6 This is a schematic diagram of the discrete completion section of a horizontal well in an embodiment of the present invention, which ultimately yields multiple independent fluid production units.

[0059] In step 104, under the constraints of the physical property parameters, the production volume of the discrete production units is inverted, and the well test pressure derivative curve formed by the combination of each production unit is fitted with the measured well test pressure derivative curve multiple times until the fitting degree reaches the preset fitting value.

[0060] In step 105, the production and injection profile of the horizontal well is determined based on the combination of production units corresponding to the well test pressure derivative curve;

[0061] In step 106, interference well testing is performed sequentially on the injection wells in the well group where the horizontal well is located to determine the direction of water inflow to the production well.

[0062] The following example, using a heterogeneous carbonate reservoir in an oilfield, illustrates the specific application of the method proposed in this invention. This reservoir has a burrowing layer at the top, exhibiting extreme differences in vertical physical properties, with a permeability difference of 8.9. Figure 7 This is a permeability statistics diagram of various layers in the reservoir in this embodiment of the invention. The reservoir is produced using a horizontal well network of injection and production wells. Some of the horizontal wells, acting as production wells, have traversed the burrowing layer. After water injection development, the production wells quickly reached water, resulting in a short waterless production period and an average water cut of over 70%. Figure 8 This is a production dynamic curve diagram of production well 1116H in an embodiment of the present invention.

[0063] Water inflow direction analysis was performed on one production well (1116H) and eight surrounding wells in the reservoir. Part of the horizontal section of this well crosses a burrowing layer. Analysis of the well test pressure derivative curve morphology showed that the overall quality of the curve was good, but inter-well interference was observed at the end. Figure 9 The pressure derivative curve of production well 1116H in this embodiment of the invention has an overall slope of 1 / 2, which conforms to the characteristics of linear flow. The physical property parameters obtained by classifying and interpreting the pressure derivative curves are shown in Table 1.

[0064] Table 1

[0065]

[0066] Inversion of physical properties revealed an average flow rate of 1338 bbl / d during the well test and start-up phase. Well 1116H had two main producing sections: 25% at the root and 75% at the toe of the horizontal well (see Table 2). The well trajectory showed that the horizontal well passed through a high-permeability layer, and the location of this high-permeability section coincided with the high-production location analyzed during the well test. Figure 10 This is the inversion result of the production unit of production well 1116H in this embodiment of the invention.

[0067] Table 2

[0068] Location 1 (m) 26.91 Length 1 (m) 165.2 Traffic volume 1 (bbl / d) 335 Location 2 (m) 263.51 Length 2 (m) 203.19 Flow rate 2 (bbl / d) 1003

[0069] Finally, interference tests were conducted sequentially on the injection wells within the well group containing production well 1116H to determine the direction of water inflow to the production well. Comparison revealed that the test signal from injection well 1125H, directly opposite production well 1116H, exhibited interference with changes in the operating regime of production well 1116H. Figures 11-12 This is a schematic diagram illustrating the interpretation of interference testing of water injection wells within the well group where production well 1116H is located, in an embodiment of the present invention. Figure 11 This is a schematic diagram of the well group where production well 1116H was subjected to interference testing. Figure 12 The diagram shows the interference test of production well 1116H and injection well 1125H. It indicates that the water inflow direction of production well 1116H is the same as that of injection well 1125H. The injected water mainly enters the tail section along the burial layer, causing the oil well to be rapidly flooded.

[0070] In summary, the method described in this invention clarifies the relationship between the reservoir well test curve response characteristics and the reservoir flow field by comprehensively considering production dynamics, reservoir flow field, and well test interpretation. Regarding flow field understanding, it inverts the incoming water direction to achieve multi-stage well test analysis of horizontal wells in reservoirs containing burrowing layers. The method is flexible in operation, less affected by subjective factors, and can be used for the processing and research of various reservoirs containing burrowing layers and various horizontal well networks.

[0071] This invention also proposes a device for generating multi-stage well test analysis of horizontal wells in reservoirs containing burrowing formations. Its principle is similar to that of the method for generating multi-stage well test analysis of horizontal wells in reservoirs containing burrowing formations, and will not be described in detail here.

[0072] Figure 13 This is a schematic diagram of a multi-stage well test analysis generation device for horizontal wells in reservoirs containing burrowing formations, as described in an embodiment of the present invention, including:

[0073] The curve acquisition module 1301 is used to acquire the well test pressure derivative curve of a horizontal well containing a burrowing reservoir;

[0074] The classification and interpretation module 1302 is used to classify and interpret the well test pressure derivative curve based on whether the horizontal well trajectory passes through the burial layer, and to obtain the physical property parameters of the formation around the horizontal well.

[0075] The production unit discretization module 1303 is used to discretize the horizontal well completion section into multiple independent production units, wherein each production unit follows the horizontal well seepage equation and boundary conditions.

[0076] The inversion module 1304 is used to perform production inversion on discrete production units under the constraints of the physical property parameters, and to fit the test pressure derivative curve formed by the combination of each production unit with the measured test pressure derivative curve multiple times until the fitting degree reaches the preset fitting value.

[0077] The production and injection profile analysis module 1305 is used to determine the production and injection profile of a horizontal well based on the combination of production units corresponding to the well test pressure derivative curve.

[0078] The water inflow direction analysis module 1306 is used to perform interference well test interpretation on each injection well in the well group where the horizontal well is located, and to determine the water inflow direction of the production well.

[0079] In one embodiment, the apparatus further includes a curve preprocessing module 1307, used for:

[0080] After obtaining the well test pressure derivative curves of horizontal wells in reservoirs containing thieves, anomalies in the well test pressure derivative curves of horizontal wells in reservoirs containing thieves are analyzed to eliminate well test pressure derivative curves containing interference sources.

[0081] The well pressure derivative curves of wells whose well test curve quality distortion exceeds a preset threshold are excluded.

[0082] In one embodiment, the classification and interpretation module is specifically used for:

[0083] For horizontal wells whose trajectory passes through the thief layer at a preset ratio, the line segment with a pressure derivative slope of 1 / 2 is selected as the linear flow stage. The first well test interpretation model is used to perform well test interpretation and obtain the physical property parameters of the formation around the horizontal well.

[0084] For horizontal wells whose overall trajectory lies above or below a high-permeability layer, a line segment with a pressure derivative slope of 1 / 4 is selected as the linear flow stage. The second well test interpretation model is used for interpretation to obtain the physical properties of the formation surrounding the horizontal well.

[0085] In one embodiment, the first well test interpretation model is a homogeneous model, and the second well test interpretation model is a numerical model.

[0086] In one embodiment, the device further includes a calibration module 1308, for:

[0087] After obtaining the physical property parameters of the formation around the horizontal well, a forward modeling of the physical property parameters of the formation around the horizontal well is performed. Based on the saturation monitoring results of the adjacent well zone, the accuracy of the flow field distribution of the well test interpretation model is verified to meet the preset accuracy.

[0088] If not, re-interpret the well test pressure derivative curves until the accuracy of the flow field distribution in the well test interpretation model reaches the preset precision.

[0089] In one embodiment, the physical properties of the formation surrounding the horizontal well include one or any combination of the following: wellbore reservoir coefficient, skin coefficient, formation permeability, vertical permeability, horizontal permeability, effective length of the horizontal well, and investigation radius.

[0090] This invention also provides a computer device. Figure 14 This is a schematic diagram of a computer device in an embodiment of the present invention. The computer device 1400 includes a memory 1410, a processor 1420, and a computer program 1430 stored in the memory 1410 and executable on the processor 1420. When the processor 1420 executes the computer program 1430, it implements the above-mentioned method for multi-stage well test analysis of horizontal wells with burrowing reservoirs.

[0091] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for multi-stage well testing analysis of horizontal wells containing burrowing reservoirs.

[0092] This invention also provides a computer program product, which includes a computer program that, when executed by a processor, implements the above-described method for multi-stage well testing analysis of horizontal wells containing burrowing reservoirs.

[0093] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0094] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0095] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0096] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0097] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for multi-stage well test analysis of horizontal wells in reservoirs containing burrowing formations, characterized in that, include: Obtain the well test pressure derivative curves of horizontal wells containing burrowing reservoirs; Based on whether the horizontal well trajectory passes through the burrowing layer, the well test pressure derivative curve is classified and interpreted to obtain the physical property parameters of the formation surrounding the horizontal well. The horizontal well completion section is discretized into multiple independent production units, each of which follows the horizontal well flow equation and boundary conditions. Under the constraints of the physical property parameters, the production volume of discrete production units is inverted, and the well test pressure derivative curve formed by the combination of each production unit is fitted with the measured well test pressure derivative curve multiple times until the fitting degree reaches the preset fitting value. The production and injection profile of the horizontal well is determined based on the combination of production units corresponding to the well test pressure derivative curve. Interference well tests were conducted sequentially on the injection wells within the well group containing the horizontal well to determine the direction of water inflow to the production wells; Based on whether the horizontal well trajectory crosses a stratum of high permeability, the well test pressure derivative curves are classified and interpreted to obtain the physical properties of the formation surrounding the horizontal well. This includes: for horizontal wells whose trajectories cross stratum of high permeability, a segment with a pressure derivative slope of 1 / 2 is selected as the linear flow stage, and the first well test interpretation model is used to interpret the curves and obtain the physical properties of the formation surrounding the horizontal well; for horizontal wells whose trajectories are entirely above or below a high permeability layer, a segment with a pressure derivative slope of 1 / 4 is selected as the linear flow stage, and the second well test interpretation model is used to interpret the curves and obtain the physical properties of the formation surrounding the horizontal well. The first well test interpretation model is a homogeneous model, and the second well test interpretation model is a numerical model. After obtaining the physical properties of the formation surrounding the horizontal well, the process also includes: performing forward modeling on the physical properties of the formation surrounding the horizontal well; verifying whether the accuracy of the flow field distribution of the well test interpretation model reaches the preset accuracy based on the saturation monitoring results of the adjacent well zone; if not, re-classifying and interpreting the well test pressure derivative curve until the accuracy of the flow field distribution of the well test interpretation model reaches the preset accuracy.

2. The method according to claim 1, characterized in that, After obtaining the well test pressure derivative curves of horizontal wells containing burrowing reservoirs, the following is also included: Anomalies in the well test pressure derivative curves of horizontal wells in reservoirs containing burrowing layers were analyzed to eliminate well test pressure derivative curves containing interference sources. The well pressure derivative curves of wells whose well test curve quality distortion exceeds a preset threshold are excluded.

3. The method according to claim 1, characterized in that, The physical properties of the formation surrounding a horizontal well include one or any combination of the following: wellbore reservoir coefficient, skin coefficient, formation permeability, vertical permeability, horizontal permeability, effective length of the horizontal well, and investigation radius.

4. A multi-stage well test analysis device for horizontal wells in reservoirs containing burrowing formations, characterized in that, include: The curve acquisition module is used to acquire the well test pressure derivative curves of horizontal wells containing burrowing reservoirs; The classification and interpretation module is used to classify and interpret the well test pressure derivative curve based on whether the horizontal well trajectory passes through the burrowing formation, and to obtain the physical property parameters of the formation around the horizontal well. The production unit discretization module is used to discretize the horizontal well completion section into multiple independent production units, where each production unit follows the horizontal well seepage equation and boundary conditions. The inversion module is used to invert the production volume of discrete production units under the constraints of the physical property parameters, and to fit the test pressure derivative curve formed by the combination of each production unit with the measured test pressure derivative curve multiple times until the fitting degree reaches the preset fitting value. The production and injection profile analysis module is used to determine the production and injection profile of a horizontal well based on the combination of production units corresponding to the well test pressure derivative curve. The water inflow direction analysis module is used to perform interference well test interpretation on each injection well in the well group where the horizontal well is located, and to determine the water inflow direction of the production well. The classification and interpretation module is used for: for horizontal wells whose trajectories cross the strata of a preset proportion, selecting the segment with a pressure derivative slope of 1 / 2 as the linear flow stage, and using the first well test interpretation model to perform well test interpretation and obtain the physical property parameters of the formation around the horizontal well; for horizontal wells whose trajectories are located above or below high-permeability layers, selecting the segment with a pressure derivative slope of 1 / 4 as the linear flow stage, and using the second well test interpretation model to perform interpretation and obtain the physical property parameters of the formation around the horizontal well. The first well test interpretation model is a homogeneous model, and the second well test interpretation model is a numerical model. The device also includes a calibration module, used to: after acquiring the physical property parameters of the formation around the horizontal well, perform forward modeling on the physical property parameters of the formation around the horizontal well, and verify whether the accuracy of the flow field distribution of the well test interpretation model reaches the preset accuracy based on the saturation monitoring results of the adjacent well zone; if not, re-classify and interpret the well test pressure derivative curve until the accuracy of the flow field distribution of the well test interpretation model reaches the preset accuracy.

5. The apparatus according to claim 4, characterized in that, It also includes a curve preprocessing module for: After obtaining the well test pressure derivative curves of horizontal wells in reservoirs containing burrowing layers, anomalies in the well test pressure derivative curves of horizontal wells in reservoirs containing burrowing layers are analyzed to eliminate well test pressure derivative curves containing interference sources. The well pressure derivative curves of wells whose well test curve quality distortion exceeds a preset threshold are excluded.

6. The apparatus according to claim 4, characterized in that, The physical properties of the formation surrounding a horizontal well include one or any combination of the following: wellbore reservoir coefficient, skin coefficient, formation permeability, vertical permeability, horizontal permeability, effective length of the horizontal well, and investigation radius.

7. A computer device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the method of any one of claims 1 to 3.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method of any one of claims 1 to 3.

9. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the method of any one of claims 1 to 3.

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