Multi-source data fusion model-based ground brine well and dissolved channel communication construction method

Abstract

The invention discloses a ground brine well dissolved channel communication construction method based on multi-source data fusion model construction, and relates to the technical field of salt well mining. The three-dimensional geophysical prospecting technology and the sonar technology are adopted, the morphological position of the vertical well section is measured, and the size of a cavity of the vertical well section, the size of a bottom channel and the approximate direction are determined; the butt joint position is confirmed according to the methods of comparison of an inclination measurement result and original data, mutual parameter correction, measurement error reduction and the like, and a design scheme is written according to construction requirements; the obtained data are imported into modeling software for simulation, a complete data model is established through a digital simulation technology, and by predicting and analyzing existing data, a construction scheme is continuously adjusted, field production is guided, one-time connection is ensured, and the target hitting rate is increased. According to the method, closed-loop control is formed from macroscopic path planning to microcosmic target spot positioning to real-time deviation correction in the drilling process, and the problem of precise butt joint of the horizontal wells in the complex salt layer is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of salt well mining, in particular to a ground halite well channel connecting construction method based on a multi-source data fusion model. BACKGROUND

[0002] Salt is an important resource indispensable to human survival and chemical production, and its mining efficiency and technical level are directly related to resource utilization and production cost. The mining of well-mined salt has gone through traditional stages such as single well water solution mining, fracturing method, and natural dissolution method. Although these methods are basic, they generally have low yield, high cost, many accidents in the well, low resource recovery rate, unstable brine concentration, and high environmental pollution risk, and have been difficult to meet the needs of modern industry for efficient and green development of resources.

[0003] With the progress of drilling technology, the emergence of horizontal well drilling technology, especially the docking well technology, has brought revolutionary changes to salt mining. The docking well technology aims to achieve precise connection underground by drilling a new horizontal well with an existing production wellbore or dissolution cavity, forming a more optimal fluid channel, thereby expected to greatly improve the recovery rate.

[0004] However, in actual engineering applications, especially in the construction process aimed at connecting the existing horizontal section dissolution cavity, the docking well technology faces severe challenges, and the existing conventional measurement and control methods have the following problems: first, precise docking underground is difficult to achieve, and drilling trajectory "misses the target" frequently; second, after the first docking fails, secondary or even multiple sidetracking or redrilling operations are required, which not only wastes a lot of manpower, material resources and financial resources, but also greatly prolongs the construction period; finally, even if the docking is successful, a long slotting time is often needed to expand the dissolution cavity channel to achieve the required brine concentration and flow rate for mining, affecting the production efficiency.

[0005] Therefore, the present application proposes a ground halite well channel connecting construction method based on a multi-source data fusion model. SUMMARY

[0006] The purpose of the present application is to provide a ground halite well channel connecting construction method based on a multi-source data fusion model to solve the problems raised in the background art.

[0007] To achieve the above purpose, the present application provides the following technical solution: a ground halite well channel connecting construction method based on a multi-source data fusion model, which is implemented based on seismic technology, sonar technology and borehole inclinometer data, and includes the following steps: Three-dimensional seismic measurement, sonar cavity measurement and gyroscopic inclinometer measurement are performed on the two halite well boreholes of the completed borehole one and borehole two, respectively, to collect stratum structure data, dissolution cavity shape data and borehole trajectory data; The formation structure data, cavity morphology data and borehole trajectory data are fused and processed. A downhole three-dimensional digital model is constructed based on the fused data. The initial construction trajectory of borehole three is designed based on the downhole three-dimensional digital model. Borehole three is located in the middle of the bottom channel of borehole one and borehole two. The drilling-while-directed drilling technology was used for the construction of borehole 3, and the borehole 3 trajectory data was collected in real time and fed back to the three-dimensional digital model to dynamically correct the construction trajectory. When borehole 3 is drilled to the predetermined distance from the designed docking position, ground-penetrating radar is used to accurately detect the target cavity, update the three-dimensional digital model, and complete the final trajectory adjustment to achieve precise connection of the horizontal sections of the three brine well boreholes.

[0008] Furthermore, three-dimensional seismic measurements, sonar cavity measurements, and gyro inclination measurements were conducted on the two completed brine well boreholes, Borehole 1 and Borehole 2, as detailed below: Before drilling the third borehole, gyro logging technology was used to re-measure the well inclination azimuth data of boreholes one and two, sonar cavity logging technology was used to obtain the cavity morphology and development azimuth data of the two boreholes, and three-dimensional seismic technology was used to obtain the stratigraphic structure and cavity spatial distribution data. The measurement data was compared and corrected with the design documents to reconstruct an accurate downhole three-dimensional digital model, and the initial construction trajectory of borehole three was designed based on the corrected data.

[0009] Furthermore, the fusion processing of stratigraphic structure data, cavity morphology data, and borehole trajectory data refers to registering and overlaying the stratigraphic and tectonic interfaces interpreted from 3D seismic data, the 3D point cloud model of the cavity obtained from sonar cavity measurement, and the high-precision borehole trajectory obtained from gyro inclinometer measurement in the same 3D spatial coordinate system.

[0010] Furthermore, borehole three is located in the middle of the bottom channels of borehole one and borehole two. Specifically, the surface position of the wellhead of borehole three is located in the vertical line region of the line connecting the wellheads of borehole one and borehole two on the horizontal projection plane, and its designed horizontal section trajectory is located within the shortest distance interval of the connection path between the bottom channels of the two boreholes, so as to achieve the optimal docking efficiency.

[0011] Furthermore, the construction of the downhole three-dimensional digital model is achieved using professional digital modeling software. The software has a multi-source heterogeneous data fusion interface, which can simultaneously integrate and process three-dimensional seismic data, sonar point cloud data, gyroscope inclinometer data and ground-penetrating radar reflection data, and generate a visual construction navigation interface.

[0012] Furthermore, the initial construction trajectory of borehole three was designed based on the downhole three-dimensional digital model, specifically as follows: In the model, the trajectory is designed based on the principle that the target trajectory line of borehole three is located on the extended center line of the cavity channel at the bottom of borehole one and borehole two.

[0013] Furthermore, real-time acquisition of borehole trajectory data and feedback to the three-dimensional digital model, and dynamic correction of the construction trajectory, refers to the real-time synchronous feedback of the actual drilling inclination and azimuth data of borehole three to the three-dimensional digital model. The model compares the actual drilling trajectory with the design trajectory in real time and displays it visually. When the deviation between the actual drilling trajectory and the design trajectory exceeds a preset threshold, the deviation is corrected by adjusting the drill string combination or drilling parameters, so that the actual drilling trajectory returns to the design trajectory.

[0014] Furthermore, the predetermined range is within 100 meters of the designed docking position when borehole three is drilled. At this time, ground penetrating radar is used to conduct 360° all-round precise detection of the target cavity to obtain the actual boundary, extension direction and spatial volume data of the cavity. Based on this, the downhole three-dimensional digital model is finally updated, and the terminal trajectory of borehole three is adjusted to deviate from the center line of the cavity by less than 5 meters.

[0015] Furthermore, achieving precise connection of the solution channels in the horizontal sections of the three brine wells means that the successful target point of borehole three simultaneously penetrates the target solution cavities at the bottom of borehole one and borehole two, forming a channel that allows for fluid communication.

[0016] Furthermore, sonar cavity measurement was performed using rotating scanning sonar to obtain three-dimensional point cloud morphology data of the downhole cavities in boreholes one and two.

[0017] This invention has at least the following beneficial effects: 1. This invention effectively overcomes the shortcomings of incomplete and large errors of single-technology data by constructing a progressive control system of "macro-level seismic guidance, micro-level sonar correction, and real-time inclination measurement control". This system is like installing a "high-precision navigation system" for underground drilling operations. From macro-path planning to micro-target positioning, and then to real-time deviation correction during the drilling process, a closed-loop control is formed, which solves the problem of precise docking of horizontal wells in complex salt layers.

[0018] 2. This invention, based on a dynamic three-dimensional digital model fused from multi-source data, can almost realistically reproduce the downhole geological environment and the spatial morphology of the target cavity, making trajectory design more scientific and reasonable. Combined with real-time feedback while drilling and a dynamic correction mechanism, it ensures that the drill bit can advance strictly according to the predetermined trajectory, significantly improving the probability of accurately penetrating the target cavity in one go and effectively avoiding secondary or even multiple rework caused by "missing the target".

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] Figure 1 This is a schematic flowchart of the construction method described in this invention; Figure 2This is a schematic diagram of the drilling trajectory of the construction method described in this invention; Figure 3 This is a three-dimensional seismic survey result image of the construction method described in this invention; Figure 4 This is a schematic diagram of the sonar cavity measurement results of the construction method described in this invention. Detailed Implementation

[0021] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0022] Explanation of related terms: Brine well: A well used to extract underground brine.

[0023] Solution channel: refers to the connecting channel of the solution cavity formed by the water-soluble mining of salt mines.

[0024] Docking: refers to making a new borehole spatially connected with an existing cavity or borehole.

[0025] Drilling stages: In drilling engineering, the drilling stages with different well diameters.

[0026] Target hit: The actual target point in the borehole matches the designed target point.

[0027] Please see Figures 1-4 This invention provides a technical solution: a method for connecting karst channels in surface brine wells based on a multi-source data fusion model. This method is implemented using seismic technology, sonar technology, and borehole survey data, and includes the following steps: Three-dimensional seismic surveys, sonar cavity measurement, and gyro inclination measurement were conducted on the two completed brine well boreholes, borehole 1 and borehole 2, respectively, to collect stratigraphic structure data, cavity morphology data, and borehole trajectory data. The formation structure data, cavity morphology data and borehole trajectory data are fused and processed. A downhole three-dimensional digital model is constructed based on the fused data. The initial construction trajectory of borehole three is designed based on the downhole three-dimensional digital model. Borehole three is located in the middle of the bottom channel of borehole one and borehole two. The drilling-while-directed drilling technology was used for the construction of borehole 3, and the borehole 3 trajectory data was collected in real time and fed back to the three-dimensional digital model to dynamically correct the construction trajectory. When borehole 3 is drilled to the predetermined distance from the designed docking position, ground-penetrating radar is used to accurately detect the target cavity, update the three-dimensional digital model, and complete the final trajectory adjustment to achieve precise connection of the horizontal sections of the three brine well boreholes.

[0028] Regarding the technical solution of this embodiment, three-dimensional seismic measurement, sonar cavity measurement, and gyro inclination measurement were performed on the two completed brine well boreholes, borehole one and borehole two, as detailed below: Before drilling the third borehole, gyro logging technology was used to re-measure the well inclination azimuth data of boreholes one and two, sonar cavity logging technology was used to obtain the cavity morphology and development azimuth data of the two boreholes, and three-dimensional seismic technology was used to obtain the stratigraphic structure and cavity spatial distribution data. The measurement data was compared and corrected with the design documents to reconstruct an accurate downhole three-dimensional digital model, and the initial construction trajectory of borehole three was designed based on the corrected data.

[0029] Regarding the technical solution of this embodiment, the fusion processing of stratigraphic structure data, cavity morphology data and borehole trajectory data refers to registering and superimposing the stratigraphic and structural interfaces interpreted from 3D seismic data, the 3D point cloud model of the cavity obtained from sonar cavity measurement, and the high-precision borehole trajectory obtained from gyroscope inclinometer measurement in the same 3D spatial coordinate system. Specifically, the stratigraphic and structural interfaces interpreted from 3D seismic data, the 3D point clouds of cavities acquired by sonar, and the high-precision borehole trajectories obtained from gyro-based inclinometers are imported into professional geological modeling software (such as Petrel and GOCAD). Within the software, all data are registered, overlaid, and fused under the same spatial coordinate system to construct an integrated downhole 3D digital model. This model can intuitively and accurately display the stratigraphy, structures, existing borehole trajectories, and the true spatial distribution of cavities. Figure 2 and Figure 3 As shown in the figure. Based on this model, the extension direction of the karst channels at the bottom of borehole 1 and borehole 2 is analyzed. Based on this, the initial construction trajectory of the newly added borehole 3 is designed. The design principle is to make the surface position of the wellhead of borehole 3 on the horizontal projection plane be in the region of the perpendicular bisector of the line connecting the wellheads of borehole 1 and borehole 2, and its designed horizontal trajectory is located within the shortest distance interval of the connecting path of the karst channels at the bottom of the two boreholes, so as to achieve the optimal docking efficiency.

[0030] Regarding the technical solution of this embodiment, the construction of the downhole three-dimensional digital model is achieved using professional digital modeling software. The software has a multi-source heterogeneous data fusion interface, which can simultaneously integrate and process three-dimensional seismic data, sonar point cloud data, gyroscope inclinometer data and ground-penetrating radar reflection data, and generate a visual construction navigation interface.

[0031] Regarding the technical solution of this embodiment, the initial construction trajectory of borehole three is designed based on the downhole three-dimensional digital model, specifically as follows: In the model, the trajectory is designed based on the principle that the target trajectory line of borehole three is located on the extended center line of the cavity channel at the bottom of borehole one and borehole two.

[0032] For the technical solution of this embodiment, directional drilling equipment such as Measurement While Drilling (MWD) and Logging While Drilling (LWD) are used for drilling. The MWD system transmits trajectory parameters such as well inclination and azimuth of borehole 3 back to the surface computer system in real time. The computer system synchronously updates this real-time data into the constructed three-dimensional digital model, compares the actual drilling trajectory with the design trajectory in real time, and displays it in a visual form. When the deviation between the actual drilling trajectory and the design trajectory exceeds a preset threshold, the deviation is corrected by adjusting the drill string assembly or drilling parameters to bring the actual drilling trajectory back to the design trajectory.

[0033] Regarding the technical solution of this embodiment, the predetermined range is within 100 meters of the designed docking position when borehole three is drilled. At this time, ground penetrating radar is used to conduct 360° all-round precise detection of the target cavity to obtain the actual boundary, extension direction and spatial volume data of the cavity. Based on this, the downhole three-dimensional digital model is finally updated, and the terminal trajectory of borehole three is adjusted to deviate from the center line of the cavity by less than 5 meters.

[0034] Regarding the technical solution of this embodiment, achieving precise connection of the horizontal sections of the solution channels in the three brine wells means that the successful target point of borehole three simultaneously penetrates the target solution cavities at the bottom of borehole one and borehole two, forming a channel that allows for fluid communication.

[0035] The technical solution of the present invention will be further described below with reference to specific embodiments: A brine well docking project at a salt mine plans to convert an old salt cavity into a gas storage facility. The docking project requires docking with the existing channel. However, due to the lack of preliminary data, the existing salt cavity channel data cannot support the drilling operation. Based on the current situation, the project team adopted a construction method for connecting the surface brine wells and karst channels using a multi-source data fusion model. Before construction, data acquisition was carried out using technologies such as gyroscope inclination measurement, sonar cavity measurement, and 3D seismic survey. The borehole trajectory design was completed through digital simulation technology. During construction, data was collected and compared strictly according to the method of measuring every 10 meters. When the construction reached 100 meters before the docking point, deep-ground radar was used to explore the location of the cavity development. Combined with the previous drilling data, the data was calibrated to confirm the final trajectory. Construction was carried out according to the designed trajectory, and the drilling was carried out to achieve precise target hitting according to the design, connecting with the original cavity.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances. When an element is referred to as being "assembled on," "mounted on," "fixed to," or "set on" another element, it may be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0039] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A method for constructing surface brine well karst passage connections based on a multi-source data fusion model, implemented using seismic technology, sonar technology, and borehole survey data, characterized in that... Includes the following steps: Three-dimensional seismic surveys, sonar cavity measurement, and gyro inclination measurement were conducted on the two completed brine well boreholes, borehole 1 and borehole 2, respectively, to collect stratigraphic structure data, cavity morphology data, and borehole trajectory data. The formation structure data, cavity morphology data and borehole trajectory data are fused and processed. A downhole three-dimensional digital model is constructed based on the fused data. The initial construction trajectory of borehole three is designed based on the downhole three-dimensional digital model. Borehole three is located in the middle of the bottom channel of borehole one and borehole two. The drilling-while-directed drilling technology was used for the construction of borehole 3, and the borehole 3 trajectory data was collected in real time and fed back to the three-dimensional digital model to dynamically correct the construction trajectory. When borehole 3 is drilled to the predetermined distance from the designed docking position, ground-penetrating radar is used to accurately detect the target cavity, update the three-dimensional digital model, and complete the final trajectory adjustment to achieve precise connection of the horizontal sections of the three brine well boreholes.

2. The method for constructing surface brine well karst passage connections based on a multi-source data fusion model according to claim 1, characterized in that: Three-dimensional seismic surveys, sonar cavity measurements, and gyro inclination measurements were conducted on the two completed brine well boreholes, Borehole 1 and Borehole 2, as detailed below: Before drilling the third borehole, gyro logging technology was used to re-measure the well inclination azimuth data of boreholes one and two, sonar cavity logging technology was used to obtain the cavity morphology and development azimuth data of the two boreholes, and three-dimensional seismic technology was used to obtain the stratigraphic structure and cavity spatial distribution data. The measurement data was compared and corrected with the design documents to reconstruct an accurate downhole three-dimensional digital model, and the initial construction trajectory of borehole three was designed based on the corrected data.

3. The method for constructing surface brine well karst passage connections based on a multi-source data fusion model according to claim 2, characterized in that: The fusion processing of stratigraphic structure data, cavity morphology data and borehole trajectory data refers to registering and overlaying the stratigraphic and tectonic interfaces interpreted from 3D seismic data, the 3D point cloud model of the cavity obtained from sonar cavity measurement, and the high-precision borehole trajectory obtained from gyro inclinometer measurement in the same 3D spatial coordinate system.

4. The method for constructing surface brine well karst passage connections based on a multi-source data fusion model according to claim 2, characterized in that: Borehole 3 is located in the middle of the bottom channels of Borehole 1 and Borehole 2. Specifically, the surface position of the wellhead of Borehole 3 is located in the vertical line region of the line connecting the wellheads of Borehole 1 and Borehole 2 on the horizontal projection plane, and its designed horizontal section trajectory is located within the shortest distance interval of the connection path between the bottom channels of the two boreholes, so as to achieve the optimal docking efficiency.

5. The method for constructing surface brine well karst passage connections based on a multi-source data fusion model according to claim 4, characterized in that: The construction of the downhole 3D digital model is achieved using professional digital modeling software. The software has a multi-source heterogeneous data fusion interface, which can simultaneously integrate and process 3D seismic data, sonar point cloud data, gyroscope inclinometer data and ground-penetrating radar reflection data, and generate a visual construction navigation interface.

6. The method for constructing surface brine well karst passage connections based on a multi-source data fusion model according to claim 5, characterized in that: The initial construction trajectory of borehole three was designed based on the downhole 3D digital model, as follows: In the model, the trajectory is designed based on the principle that the target trajectory line of borehole three is located on the extended center line of the cavity channel at the bottom of borehole one and borehole two.

7. The method for constructing surface brine well karst passage connections based on a multi-source data fusion model according to claim 6, characterized in that: Real-time acquisition of borehole trajectory data and feedback to the three-dimensional digital model, and dynamic correction of the construction trajectory, refers to the real-time synchronous feedback of the actual drilling inclination and azimuth data of borehole 3 to the three-dimensional digital model. The model compares the actual drilling trajectory with the design trajectory in real time and displays it visually. When the deviation between the actual drilling trajectory and the design trajectory exceeds the preset threshold, the deviation is corrected by adjusting the drill string combination or drilling parameters, so that the actual drilling trajectory returns to the design trajectory.

8. The method for constructing surface brine well karst passage connections based on a multi-source data fusion model according to claim 7, characterized in that: The predetermined range is within 100 meters of the designed docking position when borehole three is drilled. At this time, ground penetrating radar is used to conduct 360° all-round precise detection of the target cavity to obtain the actual boundary, extension direction and spatial volume data of the cavity. Based on this, the downhole three-dimensional digital model is updated to adjust the terminal trajectory of borehole three to a deviation of less than 5 meters from the center line of the cavity.

9. The method for constructing surface brine well karst passage connections based on a multi-source data fusion model according to claim 8, characterized in that: Achieving precise connection of the horizontal sections of the three brine well boreholes means that the successful target point of borehole three simultaneously penetrates the target cavity at the bottom of borehole one and borehole two, forming a channel that allows for fluid communication.

10. The method for constructing surface brine well karst passage connections based on a multi-source data fusion model according to claim 3, characterized in that: Sonar cavity measurement was performed using rotating scanning sonar to obtain three-dimensional point cloud morphology data of the downhole cavities in boreholes one and two.

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