Device and method for predicting gas production rate of high-water-content tight sandstone gas reservoir

Abstract

The invention relates to the technical field of oil-gas exploration, in particular to a high-water-content tight sandstone gas reservoir gas production rate prediction device and method.The device comprises a drilling assembly, a transmission device, a driving device and a measuring device, and the drilling assembly, the transmission device and the driving device are installed through a machine base; the drilling assembly is used for drilling and punching in a research block to obtain geological parameters of sandstone soil in the block, the drilling assembly comprises a first drilling rod and a second drilling rod, the second drilling rod is movably inserted into a cylindrical cavity in the first drilling rod, and an air entraining pipe and a detection assembly are further arranged in the cylindrical cavity of the first drilling rod. According to the method, the geological parameters of the soil are obtained from the interior of the sandstone through drilling, comprehensive analysis and comparison are carried out in combination with the production data and the geological parameters of at least one well put into production in the same research block, the optimal single-well daily gas production prediction model is selected, and the single-well daily gas production of the target well section to be subjected to well logging can be accurately predicted.

Description

Technical Field

[0001] This invention relates to the field of oil and gas exploration technology, and is a device and method for predicting the gas production of high water-bearing tight sandstone gas reservoirs. Background Technology

[0002] Tight sandstone gas reservoirs refer to low-permeability oil and gas reservoirs characterized by low porosity, low permeability, low gas saturation, high water saturation, and slow natural gas flow within sandstone layers. These reservoirs are mostly continuously distributed in the center of basins or at deep structural depths. The exploration and development of conventional oil and gas reservoirs can no longer meet the ever-increasing energy demand; therefore, current exploration targets have gradually shifted from conventional oil and gas reservoirs to unconventional ones, particularly deep tight sandstone gas reservoirs.

[0003] To increase single-well production, multi-layer synergistic production has become one of the most important technologies in the development of tight sandstone gas reservoirs, playing a crucial role. High water-cut tight sandstone gas reservoirs have complex geological structures, with strong heterogeneity in the underground sandstone layers leading to significant differences in physical properties. The seepage mechanism in multi-layer synergistic production is complex, and accurately predicting the production capacity of multi-layer synergistic production in high water-cut tight sandstone gas reservoirs is currently a major challenge in their development.

[0004] Since tight sandstone gas reservoirs have virtually no natural production capacity, multiple layers need to be fractured separately before combined production, resulting in high operating costs. To reduce operating costs and ensure economic benefits, a technology is needed that can predict the gas production of high water-cut tight sandstone gas reservoirs, predict single-well production capacity, and provide a basis for developing optimal development plans to maximize economic benefits.

[0005] Predicting the gas production of sandstone gas reservoirs requires collecting sandstone geological data within the study area. In existing technologies, geological data is mostly collected from the surface or shallow sandstone areas. The collected geological data is difficult to reflect the overall situation of the gas reservoir in the sandstone soil layer, and the prediction of the gas production of sandstone gas reservoirs is not accurate enough. Summary of the Invention

[0006] This invention provides a device and method for predicting the gas production of tight sandstone gas reservoirs with high water content, which overcomes the shortcomings of the prior art. It can effectively solve the problem that the geological data obtained by the prior art is difficult to reflect the overall situation of the gas reservoir in the sandstone soil layer and the prediction of the gas production of sandstone gas reservoirs is not accurate enough.

[0007] One of the technical solutions of the present invention is achieved through the following measures: a gas production prediction device for a high water-bearing tight sandstone gas reservoir, comprising a drilling assembly, a transmission device, a drive device, and a measuring device. The drilling assembly, transmission device, and drive device are installed via a base. The drilling assembly is used to drill holes in the study block to obtain geological parameters of the sandstone soil within the block. The drilling assembly includes a first drill rod and a second drill rod. The first drill rod has an internal hollow structure, and the second drill rod is movably inserted into the cylindrical cavity inside the first drill rod. A gas inlet pipe and a detection assembly are also provided in the cylindrical cavity of the first drill rod. The detection assembly is used to detect the geological conditions of the sandstone within the borehole. The detection assembly is communicatively connected to the measuring device, and the data obtained by the detection assembly is transmitted to the measuring device for analysis and processing.

[0008] The following are further optimizations and / or improvements to one of the above-mentioned inventive technical solutions: The bottom end of the first drill rod can be fixed with a first drill bit. A through hole is opened in the middle of the inner wall of the first drill bit. One end of the second drill rod slides through the through hole in the inner wall of the first drill bit, and the bottom end of the second drill rod is fixed with a second drill bit. The second drill bit is fitted to the bottom of the first drill bit, and a first sealing ring is provided at the through hole at the bottom of the first drill bit.

[0009] The aforementioned detection assembly may include a support tube, a detection lead wire, and a detection head. The detection head is fixed at the bottom end of the support tube, and the detection lead wire is disposed in the support tube with one end of the detection lead wire electrically connected to the detection head.

[0010] The first drill rod can be fixed with auger blades, and a connector is fixed at the top of the first drill rod. A screw hole is provided at the center of the connector. One end of the second drill rod is threaded into the screw hole, and a second sealing ring is provided in the screw hole.

[0011] One end of the aforementioned air intake pipe and detection component can extend through the joint to the outside of the drilling component, and a third sealing ring is provided at the connection between the air intake pipe and the detection component and the joint.

[0012] The aforementioned transmission device can be installed at the bottom of the base, the drilling assembly is installed at the bottom of the transmission device, the drive device is installed at the top of the base, a tripod is installed at the bottom of the base corresponding to the rear side of the drilling assembly, and handles are provided on both sides of the base.

[0013] The aforementioned measuring device may include a processing module, a storage module, a control module, an input module, and an output module. The processing module is used to execute computer programs, the storage module is used to store computer programs, the control module is used to call the processing module and the storage module to realize the interaction between the processing module and the storage module, the input module is used to input data, and the output module is used to output data.

[0014] The second technical solution of the present invention is achieved through the following measures: a method for predicting gas production in a high water-bearing tight sandstone gas reservoir, comprising the following steps: obtaining geological parameters of the target well section of the well to be logged, and using the well to be logged as a benchmark, obtaining geological parameters of the target well section of at least one already-operated well in the same study area; obtaining the production pressure and gas pipeline pressure of the target well section of at least one already-operated well, and calculating the production pressure difference; obtaining the daily gas production of a single well in the target well section of at least one already-operated well; inputting the daily gas production, production pressure difference, and geological parameters of the target well section of at least one already-operated well into a measuring instrument, analyzing and comparing the data using a gas production prediction model, and selecting the optimal daily gas production prediction model for a single well; inputting the geological parameters of the target well section of the well to be logged into the selected optimal daily gas production prediction model, and deriving the daily gas production of a single well in the target well section of the well to be logged.

[0015] This invention utilizes a drilling assembly to sample sandstone cores. The assembly also includes a detection element. After drilling, the detection element allows for geological analysis of the sandstone within the borehole, obtaining relevant geological parameters such as fracture depth, fracture linear density, formation water resistivity, and gas layer resistivity. These parameters are then transmitted to a measurement device for analysis and prediction of sandstone gas production within the current block. This site-specific measurement approach ensures precise data analysis and more accurate predictions. Furthermore, this invention obtains soil geological parameters from within the sandstone through drilling, which is more accurate than parameters obtained from the sandstone surface or shallow areas. By combining this with production data and geological parameters from at least one operational well within the same study block, and selecting the optimal single-well daily gas production prediction model, a more accurate prediction of the daily gas production of the target well section can be achieved. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the drilling assembly in an embodiment of the present invention.

[0018] Figure 3 This is a cross-sectional structural diagram of the drilling assembly in an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the detection component in an embodiment of the present invention.

[0020] Figure 5 This is a flowchart illustrating the gas production prediction method for high water-bearing tight sandstone gas reservoirs in an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram showing the connection of each sub-module inside the measuring device in an embodiment of the present invention.

[0022] The codes in the attached diagram are as follows: 1 is the drilling assembly, 101 is the first drill rod, 102 is the auger blade, 103 is the first drill bit, 104 is the second drill rod, 105 is the second drill bit, 106 is the cylindrical cavity, 107 is the first sealing ring, 108 is the connector, 109 is the screw hole, 110 is the second sealing ring, 111 is the third sealing ring, 112 is the air vent pipe, 113 is the detection assembly, 1131 is the support pipe, 1132 is the detection lead wire, 1133 is the detection head, 2 is the transmission device, 3 is the base, 4 is the drive device, 5 is the handle, 6 is the tripod, and 7 is the measuring device. Detailed Implementation

[0023] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0024] The present invention will be further described below with reference to embodiments: Example 1: Please refer to Figure 1 This embodiment provides a gas production prediction device for high water-bearing tight sandstone gas reservoirs, including a drilling component 1, a transmission device 2, a drive device 4, and a measuring device 7. The drilling component 1 is used to drill holes in the study block to obtain geological parameters of the sandstone soil in the block. The drilling component 1 can be used to sample the sandstone core. The drilling component 1 also includes a detection element. After drilling the sandstone, the detection element can be used to detect the sandstone geology from inside the hole and obtain the corresponding geological parameters, such as the fracture depth, fracture linear density, formation water resistivity, and gas layer resistivity of the sandstone. The geological parameters obtained after drilling the hole by the drilling component 1 are transmitted to the measuring device 7 for analysis and detection to predict the gas production of the sandstone gas reservoir in the current block.

[0025] In this embodiment of the invention, both the transmission device 2 and the drive device 4 adopt existing devices and technologies. The transmission device 2 adopts gear transmission, and the drive device 4 adopts motor drive. The drive device 4 and the transmission device 2 work together to provide power support for drilling of the drilling assembly 1.

[0026] In this embodiment of the invention, the drilling assembly 1, the transmission device 2, and the drive device 4 are installed on the base 3. After assembly, the detection element inside the drilling assembly 1 is connected to the measuring device 7 via wired or wireless means. The wireless means can be one or more combinations of WIFI, Bluetooth, and cellular mobile communication. The transmission device 2 is installed at the bottom of the base 3, the drilling assembly 1 is installed at the bottom of the transmission device 2, and the drive device 4 is installed at the top of the base 3. A tripod 6 is installed at the bottom of the base 3 corresponding to the rear side of the drilling assembly 1. When the drilling equipment is working, the tripod 6 is placed on the ground to support the equipment. Handles 5 are provided on both sides of the base 3.

[0027] Please see Figure 2 , Figure 3 , Figure 4 In this embodiment of the invention, the drilling assembly 1 includes a first drill rod 101 and a second drill rod 104. The first drill rod 101 has an internally hollow structure, and the second drill rod 104 is movably inserted into the cylindrical cavity 106 inside the first drill rod 101. A screw conveyor blade 102 is fixed on the rod body of the first drill rod 101, and a first drill bit 103 is fixed at the bottom end of the first drill rod 101. A through hole is opened in the middle of the inner wall of the first drill bit 103. One end of the second drill rod 104 slides through the through hole in the inner wall of the first drill bit 103, and the bottom end of the second drill rod 104 is fixed. There is a second drill bit 105. In the initial state, the second drill bit 105 is close to the bottom of the first drill bit 103, blocking the through hole at the bottom of the first drill bit. When the first drill rod is drilling, it will drive the second drill rod to rotate synchronously. The first drill bit and the second drill bit move synchronously. When the hole reaches the specified depth, the first drill rod stops working. At this time, the second drill rod is rotated alone to make the second drill rod continue to drill downward. The second drill bit separates from the first drill bit, and the through hole at the bottom of the first drill bit is opened, releasing the detection element installed inside the first drill rod to detect the sandstone soil in the hole.

[0028] In this embodiment of the invention, a first sealing ring 107 is provided at the through hole at the bottom of the first drill bit 103. When the second brick is tightly attached to the bottom of the first drill bit, the joint between the two drill bits is blocked by the first sealing ring to prevent mud from entering the interior of the first drill rod during drilling. A connector 108 is fixed at the top of the first drill rod 101, and a screw hole 109 is provided at the center of the connector 108. One end of the second drill rod 104 is threaded into the screw hole 109. When the second drill rod is rotated, the second drill rod rotates downward and advances along the provided thread inside the first drill rod. A second sealing ring 110 is provided in the screw hole 109.

[0029] In this embodiment of the invention, a gas inlet pipe 112 and a detection component 113 are also provided in the cylindrical cavity 106 of the first drill pipe 101. One end of the gas inlet pipe 112 and the detection component 113 both extend through the joint 108 to the outside of the drilling component 1. A third sealing ring 111 is provided at the connection between the gas inlet pipe 112 and the detection component 113 and the joint 108. The second and third sealing rings are provided to maintain the airtightness of the first drill pipe. After drilling is completed, the through hole at the bottom of the first drill bit is opened, and the gas in the sandstone will enter the cylindrical cavity inside the first drill pipe. The gas is extracted outward through the gas inlet pipe for detection, and the content and concentration of natural gas in the gas are analyzed and statistically analyzed.

[0030] In this embodiment of the invention, the detection component 113 is used to detect the geological conditions of sandstone in the borehole. The data detected by the detection component 113 is transmitted to the measuring device 7 for analysis and imaging processing of the sandstone in the borehole. The imaging method adopts existing technology and can be one or more combinations of wellbore acoustic imaging, formation microresistivity scanning imaging, and CT scanning imaging. The detection component 113 includes a support tube 1131, a detection wire 1132, and a detection head 1133. The detection head 1133 is fixed at the bottom end of the support tube 1131. The detection wire 1132 is disposed in the support tube 1131 and one end of the detection wire 1132 is electrically connected to the detection head 1133. When the through hole at the bottom of the first drill bit is opened, the detection component 113 is extended outward, and the sandstone condition in the borehole is detected through the detection head. The detected data is transmitted outward through the detection wire.

[0031] This invention focuses on a high-water-bearing tight sandstone gas reservoir in a study block of the Sulige Basin. A gas production prediction device for this reservoir is designed to perform drilling sampling and production prediction. The device can obtain geological parameters of various underground layers within the high-water-bearing tight sandstone gas reservoir, providing more accurate and comprehensive data samples, thus improving the accuracy of gas production prediction.

[0032] This invention utilizes a drilling assembly to sample sandstone cores. The assembly also includes a detection element. After drilling, the detection element allows for geological analysis of the sandstone within the borehole, obtaining relevant geological parameters such as fracture depth, fracture linear density, formation water resistivity, and gas layer resistivity. These parameters are then transmitted to a measurement device for analysis and prediction of sandstone gas production within the current block. This site-specific measurement approach ensures precise data analysis and more accurate predictions. Furthermore, this invention obtains soil geological parameters from within the sandstone through drilling, which is more accurate than parameters obtained from the sandstone surface or shallow areas. By combining this with production data and geological parameters from at least one operational well within the same study block, and selecting the optimal single-well daily gas production prediction model, a more accurate prediction of the daily gas production of the target well section can be achieved.

[0033] Example 2: Please refer to Figure 5 This embodiment provides a method for predicting gas production in high water-bearing tight sandstone gas reservoirs, including the following steps: S101: Obtain the geological parameters of the target well section of the well to be logged, and based on the well to be logged, obtain the geological parameters of the target well section of at least one well already in production within the same study area. In this embodiment of the invention, the obtained geological parameters include, but are not limited to: sandstone fracture depth, effective aperture, dip angle, and fracture linear density. The method for obtaining the geological parameters is to first drill a hole in the study block using the drilling assembly 1, and after drilling, extend the detection assembly 113 out of the hole to detect the soil conditions inside the sandstone.

[0034] S102: Obtain the production pressure of at least one production well in the target well section and the gas pipeline pressure, and calculate the production pressure difference. In this embodiment of the invention, the production data of production wells within the same study block can be obtained through production logs.

[0035] S103: Obtain the daily gas production of a single well in the target well section of at least one operational well. In this embodiment of the invention, production data of operational wells within the same study block can be obtained through production logs.

[0036] S104: Input the daily gas production, production pressure differential, and geological parameters of at least one operational well in the target well section into the measuring instrument. Analyze and compare the data using a gas production prediction model to select the optimal daily gas production prediction model for the single well. The gas production prediction model is an existing model. In this embodiment of the invention, the relevant data of at least one operational well in the same study block are input into the measuring device 7. The measuring device 7 is equipped with multiple gas production prediction models. By analyzing and comparing the data, the optimal daily gas production prediction model for the current study block is determined and selected.

[0037] S105: Input the geological parameters of the target well section to be logged into the selected optimal single-well daily gas production prediction model to derive the single-well daily gas production of the target well section. In this embodiment of the invention, the acquired geological parameters of the target well section to be logged are input into the selected optimal single-well daily gas production prediction model, and corresponding coefficients are input. The corresponding coefficients are determined by the production pressure difference. The distribution of single-well daily gas production data of the target well section under different production pressure differences is derived and summarized.

[0038] This invention takes a high water-cut tight sandstone gas reservoir in a study block of the Sulige Basin as the research object, and designs a method for predicting the gas production of such reservoirs. Drilling sampling and production prediction are conducted on the sandstone gas reservoir within the study block. Soil geological parameters obtained from within the sandstone through drilling are more accurate than parameters obtained from the sandstone surface or shallow areas. Combined with production data and geological parameters from at least one operational well in the same study block, a comprehensive analysis and comparison are performed to select the optimal single-well daily gas production prediction model. This allows for a relatively accurate prediction of the daily gas production of a single well in the target well section. Geological parameters are obtained through drilling and updated in real time, resulting in more accurate and comprehensive data samples, which improves the accuracy of gas production prediction for high water-cut tight sandstone gas reservoirs.

[0039] Example 3: Based on Examples 1 and 2, please refer to... Figure 6 In this embodiment of the invention, the measuring device 7 includes a processing module, a storage module, a control module, an input module, and an output module. The processing module is used to execute a computer program to implement the steps of the gas production prediction method in Embodiment 2. The storage module is used to store the computer program. The control module is used to call the processing module and the storage module to realize the interaction between the processing module and the storage module. The input module is used to input data, and the output module is used to output data. The sandstone geological parameters obtained by the drilling component 1 are uploaded to the storage module through the input module for data transfer. The control module calls the processing module to read the transferred data and computer program in the storage module, analyzes and processes the data, and the processed data is transferred back to the storage module. The control module calls the output module to transmit the processed data to the outside.

[0040] It should be noted that the terms "first," "second," etc., used in the above-described drawings in this specification are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, apparatus, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0041] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0043] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A device for predicting gas production in high water-bearing tight sandstone gas reservoirs, characterized in that... The system includes a drilling assembly, a transmission device, a drive device, and a measuring device. The drilling assembly, transmission device, and drive device are mounted on a base. The drilling assembly is used to drill holes in the study block to obtain geological parameters of the sandstone and soil within the block. The drilling assembly includes a first drill rod and a second drill rod. The first drill rod has an internal hollow structure, and the second drill rod is movably inserted into the cylindrical cavity inside the first drill rod. An air vent and a detection assembly are also installed in the cylindrical cavity of the first drill rod. The detection assembly is used to detect the geological conditions of the sandstone within the borehole. The detection assembly is communicatively connected to the measuring device, and the data obtained by the detection assembly is transmitted to the measuring device for analysis and processing.

2. The gas production prediction device for high water-bearing tight sandstone gas reservoirs according to claim 1, characterized in that... The bottom end of the first drill rod is fixed with a first drill bit. A through hole is opened in the middle of the inner wall of the first drill bit. One end of the second drill rod slides through the through hole in the inner wall of the first drill bit, and the bottom end of the second drill rod is fixed with a second drill bit. The second drill bit is fitted to the bottom of the first drill bit, and a first sealing ring is provided at the through hole at the bottom of the first drill bit.

3. The gas production prediction device for high water-bearing tight sandstone gas reservoirs according to claim 1 or 2, characterized in that... The detection assembly includes a support tube, a detection lead wire, and a detection head. The detection head is fixed at the bottom end of the support tube, and the detection lead wire is placed inside the support tube with one end electrically connected to the detection head.

4. The gas production prediction device for high water-bearing tight sandstone gas reservoirs according to claim 1 or 2, characterized in that... The first drill rod has a screw conveyor blade fixed on its body, and a connector is fixed at the top of the first drill rod. A screw hole is provided at the center of the connector. One end of the second drill rod is threaded into the screw hole, and a second sealing ring is provided inside the screw hole.

5. The gas production prediction device for high water-bearing tight sandstone gas reservoirs according to claim 3, characterized in that... The first drill rod has a screw conveyor blade fixed on its body, and a connector is fixed at the top of the first drill rod. A screw hole is provided at the center of the connector. One end of the second drill rod is threaded into the screw hole, and a second sealing ring is provided inside the screw hole.

6. The gas production prediction device for high water-bearing tight sandstone gas reservoirs according to claim 4 or 5, characterized in that... One end of the air intake pipe and the detection component both extend through the joint to the outside of the drilling component, and a third sealing ring is provided at the connection between the air intake pipe and the detection component and the joint.

7. The gas production prediction device for high water-bearing tight sandstone gas reservoirs according to claim 1, 2, or 5, characterized in that... The transmission device is installed at the bottom of the base, the drilling assembly is installed at the bottom of the transmission device, the drive device is installed at the top of the base, a tripod is installed at the bottom of the base corresponding to the rear side of the drilling assembly, and handles are provided on both sides of the base.

8. The gas production prediction device for high water-bearing tight sandstone gas reservoirs according to claim 3, characterized in that... The transmission device is installed at the bottom of the base, the drilling assembly is installed at the bottom of the transmission device, the drive device is installed at the top of the base, a tripod is installed at the bottom of the base corresponding to the rear side of the drilling assembly, and handles are provided on both sides of the base.

9. The gas production prediction device for high water-bearing tight sandstone gas reservoirs according to claim 1, 2, 5, or 8, characterized in that... The measuring device includes a processing module, a storage module, a control module, an input module, and an output module. The processing module is used to execute computer programs, the storage module is used to store computer programs, the control module is used to call the processing module and the storage module to realize the interaction between the processing module and the storage module, the input module is used to input data, and the output module is used to output data.

10. A method for predicting gas production in high water-bearing tight sandstone gas reservoirs, characterized in that... Includes the following steps: Geological parameters of the target well section to be logged are obtained, and based on the target well, geological parameters of the target well section of at least one already-produced well in the same study area are obtained; production pressure and gas pipeline pressure of the target well section of at least one already-produced well are obtained, and the production pressure difference is calculated; daily gas production of the target well section of at least one already-produced well is obtained; the daily gas production, production pressure difference, and geological parameters of the target well section of at least one already-produced well are input into the measuring instrument, and the data are analyzed and compared using a gas production prediction model to select the optimal daily gas production prediction model; the geological parameters of the target well section to be logged are input into the selected optimal daily gas production prediction model to derive the daily gas production of the target well section to be logged.

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