Coupling correction method and system based on directional drilling track and geologic body model

Abstract

The invention belongs to the field of hydroelectric engineering directional drilling engineering investigation, discloses a coupling correction method and system based on a directional drilling track and a geologic body model, and solves the problems that in the prior art, the directional drilling track design is not tightly combined with the geologic body model, so that a drilled hole is prone to deviating from a preset geologic body, and the investigation purpose cannot be achieved; drilling and data collection are not synchronous, and geological phenomena in the drilling process cannot be interpreted in time. The method comprises the following steps: collecting real-time data of a drilling track, drawing the drilling track in real time by adopting three-dimensional modeling software based on the real-time data of the drilling track, and embedding the drilling track drawn in real time into a geologic body model to form a coupling model; in the drilling process, based on the drilling track, whether directional drilling deflecting correction or geologic body model correction needs to be carried out or not is judged by comparing the geological phenomenon revealed by the drilled rock core with the geological phenomenon in the coupling model. The method is suitable for water-power engineering investigation.

Description

Technical Field

[0001] The invention belongs to the field of directional drilling engineering survey for hydropower projects, and in particular relates to a coupling correction method and system based on directional drilling trajectory and geological body model. Background Art

[0002] As global energy demand continues to grow, the development and utilization of hydropower as a clean and renewable energy form has received widespread attention. In recent years, the development of hydropower stations has gradually entered deepwater areas, and more and more projects are facing challenges of extreme geological conditions, deep plateau landforms, and complex tectonic environments. Under these complex engineering conditions, the importance of preliminary survey work has become increasingly prominent, because the survey results are directly related to the design of the hydropower station, construction safety, and the stability of subsequent operations.

[0003] As one of the important means of engineering investigation, drilling technology can directly obtain the physical properties, structural characteristics and geological structure information of underground rock and soil layers. It is the key basis for judging whether the underground geological conditions are suitable for dam construction and construction of hydraulic structures. In the field of drilling, directional drilling technology has gradually become an ideal choice for drilling construction under complex geological conditions due to its unique advantages. Directional drilling technology controls the extension direction of the borehole by adjusting parameters such as the top angle, azimuth and tool face angle of the borehole, so that it can reach the target position according to the predetermined trajectory. In on-site construction, if the natural curvature of the stratum is used to create inclination, it has the disadvantages of uncontrollability and poor inclination quality. Usually, artificial inclination tools, namely directional drilling inclination tools, are used to create inclination. Generally, a bottom hole hydraulic motor drill bit combination is used for inclination. The structure of the bottom hole hydraulic motor drill bit combination is shown in the figure below. Figure 1 As shown, it is usually composed of a drill bit 1, a stabilizer 2, a bent outer tube 3, a screw motor 4, a bent joint 5, a non-magnetic drill collar 6, a drill rod 7 and other structures.

[0004] The trajectory design of directional drilling is a key factor affecting exploration costs, drilling project costs, construction period, geological results and engineering quality. Reasonable directional drilling trajectory design can effectively improve drilling efficiency and reduce construction risks. However, in existing engineering practices, directional drilling trajectory design often fails to fully consider the purpose of exploration, and the combination with the geological body model is not close enough, which makes it difficult to achieve an organic combination between exploration and geology. In the actual construction process, if the deflection strength of the directional drilling is insufficient or too large, it is very easy to cause the borehole to deviate from the predetermined geological body. Even if timely trajectory measurement is carried out, due to insufficient understanding of the geological body, the borehole may not achieve the exploration purpose when it reaches the designed stratum. On the other hand, in the pre-feasibility and feasibility study stages of hydropower stations, the exploration workload is huge and the number of cores produced is also very large. Many boreholes are located in high mountain canyon areas, and the number of geological personnel is limited. It is impossible to stay at the construction site and collect data in a timely manner. Usually, the cores will be moved into the core library for cataloging after the drilling is completed, which leads to a time lag in collecting data. Many geological phenomena encountered during the drilling process could not be interpreted in a timely manner, further affecting the efficiency and accuracy of the survey.

[0005] Therefore, how to organically combine directional drilling trajectory design with geological body model to achieve deep integration of exploration and geology, thereby improving survey efficiency and reducing drilling workload and survey costs is an urgent problem to be solved in the current field of hydropower engineering survey. Summary of the invention

[0006] The technical problem to be solved by the present invention is: to propose a coupling correction method and system based on directional drilling trajectory and geological body model, to solve the problem that the directional drilling trajectory design in the prior art is not closely integrated with the geological body model, which easily leads to the deviation of the borehole from the predetermined geological body, the failure to achieve the exploration purpose, the lack of synchronization between drilling and data collection, and the inability to timely interpret the geological phenomena encountered during the drilling process.

[0007] The technical solution adopted by the present invention to solve the above technical problems is: On the one hand, the present invention provides a coupling correction method based on directional drilling trajectory and geological body model, which comprises the following steps: S1. Collect the drilling data of the directional drilling process and obtain the real-time data of the drilling trajectory; S2, based on the real-time data of the drilling trajectory, the drilling trajectory is drawn in real time using 3D modeling software; S3, perform three-dimensional modeling based on the geological data formed in the early preliminary exploration stage to obtain a geological body model, and embed the real-time drawn drilling trajectory into the geological body model to form a coupled model; S4. During the drilling process, based on the drilling trajectory, by comparing the geological phenomena revealed by the drilled core with the geological phenomena in the coupling model, it is determined whether directional drilling inclination correction or geological body model correction is needed.

[0008] Furthermore, in step S2, the 3D modeling software includes but is not limited to GOCAD or EVS (Earth Volumetric Studio).

[0009] Furthermore, in step S3, an interface between the three-dimensional display of the directional drilling trajectory and the geological body model is compiled by using the Python programming language, and the real-time drawn drilling trajectory is embedded in the geological body model.

[0010] Furthermore, in step S3, the coupling model is deployed in a local database or a cloud database.

[0011] Further, in step S4, based on the drilling trajectory, by comparing the geological phenomena revealed by the drilled core with the geological phenomena in the coupling model, it is determined whether directional drilling deflection correction or geological body model correction is required, specifically including: If the drilling trajectory deviates from the designed trajectory, but the geological phenomena revealed by the core are consistent with the geological phenomena of the corresponding strata in the coupled model at the drilling location, it is judged that directional drilling deflection correction is needed; If the drilling trajectory conforms to the designed trajectory, but the geological phenomena revealed by the core are inconsistent with the geological phenomena of the corresponding strata at the drilling location in the coupled model, it is judged that the geological body model needs to be corrected.

[0012] On the other hand, the present invention also provides a coupling correction system based on directional drilling trajectory and geological body model, comprising: The data acquisition module is used to collect the drilling data during the directional drilling process and obtain the real-time data of the drilling trajectory; The 3D modeling module is used to draw the drilling trajectory in real time using 3D modeling software based on the real-time data of the drilling trajectory; and to perform 3D modeling based on the geological data formed in the early preliminary exploration stage to obtain a geological body model; A coupling module is used to embed the real-time drawn drilling trajectory into the geological body model to form a coupling model; The comparison and correction module is used to determine whether directional drilling inclination correction or geological body model correction is needed during the drilling process based on the drilling trajectory by comparing the geological phenomena revealed by the drilled core with the geological phenomena in the coupling model.

[0013] Furthermore, the 3D modeling software used in the 3D modeling module includes but is not limited to GOCAD or EVS (Earth Volumetric Studio).

[0014] Furthermore, the coupling module compiles the interface between the three-dimensional display of the directional drilling trajectory and the geological body model through the Python programming language, and embeds the real-time drawn drilling trajectory into the geological body model.

[0015] Furthermore, the coupling model is deployed in a local database or a cloud database.

[0016] Furthermore, the comparison and correction module determines whether directional drilling deflection correction or geological body model correction is needed by comparing the geological phenomena revealed by the drilled core with the geological phenomena in the coupling model based on the drilling trajectory, specifically including: If the drilling trajectory deviates from the designed trajectory, but the geological phenomena revealed by the core are consistent with the geological phenomena of the corresponding strata in the coupled model at the drilling location, it is judged that directional drilling deflection correction is needed; If the drilling trajectory conforms to the designed trajectory, but the geological phenomena revealed by the core are inconsistent with the geological phenomena of the corresponding strata at the drilling location in the coupled model, it is judged that the geological body model needs to be corrected.

[0017] The beneficial effects of the present invention are: (1) By coupling the real-time trajectory of directional drilling with the geological body model, the spatial position of the borehole can be judged more intuitively based on image processing and computer graphics technology. At the same time, the drilling trajectory is corrected by combining the geological phenomena revealed by the core sampled while drilling with the geological phenomena in the coupling model to ensure that the borehole can accurately enter the designed stratum, avoiding exploration failures caused by the deviation of the drilling trajectory from the designed stratum. The geological body model can also be adjusted in time to adapt to the actual drilling situation, realizing the simultaneous drilling and data collection, and avoiding the problem of not being able to timely interpret the geological phenomena encountered during the drilling process.

[0018] (2) The present invention integrates directional drilling technology, geological body modeling, data transmission and model correction functions into one, forming an efficient coupling system. The system can be deployed locally or in the cloud, has the characteristics of low cost and simple operation and maintenance, and is suitable for a variety of engineering survey scenarios. Based on this coupling system, it can effectively improve the efficiency of geological surveys, reduce the amount of drilling projects, and reduce survey costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a bottom hole hydraulic motor drilling tool assembly; Figure 2 It is a schematic diagram of coupling correction of directional drilling trajectory and geological body model in the present invention; Figure 3 This is a flow chart of a coupling correction method based on directional drilling trajectory and geological body model in Example 1 of the present invention; Figure 4This is a structural diagram of a coupling correction system based on a directional drilling trajectory and a geological body model in Example 2 of the present invention; Markings in the figure: 1 is the drill bit, 2 is the stabilizer, 3 is the bent outer tube, 4 is the screw motor, 5 is the bent joint, 6 is the non-magnetic drill collar, and 7 is the drill pipe. DETAILED DESCRIPTION

[0020] The present invention aims to provide a coupling correction method and system based on directional drilling trajectory and geological body model, so as to solve the problem that the directional drilling trajectory design in the prior art is not closely integrated with the geological body model, which easily leads to the deviation of the borehole from the predetermined geological body, fails to achieve the exploration purpose, drilling and data collection are not synchronized, and the geological phenomena encountered during the drilling process cannot be interpreted in time. This scheme organically combines the on-site drilling implementation with the rear geological data collection through information and intelligent means, and realizes the synchronization of drilling and data collection. This method can not only reveal the current stratum conditions of drilling in real time, but also make corrections in time when it is found that the geological phenomena are inconsistent with the expected ones, thereby improving the exploration efficiency and reducing the drilling engineering volume and exploration costs.

[0021] The coupling correction principle of this scheme for directional drilling trajectory and geological body model is as follows Figure 2 As shown, a geological body model is obtained by performing three-dimensional modeling based on the geological data formed in the early preliminary exploration stage. The geological body model is a three-dimensional model used to describe the spatial distribution of geological structures and rock strata, which includes information such as dip, strike, inclination, stratigraphic stratification and lithology. By embedding the real-time collected directional drilling trajectory data, including parameters such as dip angle, azimuth, tool face angle, magnetic declination, left and right deviation, up and down deviation, etc. into the geological body model, a coupling model is obtained. Based on the coupling model, the spatial position of the borehole in the geological body model can be reflected in real time. During the drilling process, based on the drilling trajectory, by comparing the geological phenomena revealed by the drilled core with the geological phenomena in the coupling model, directional drilling inclination correction can be performed to ensure that the borehole can accurately enter the designed stratum. The geological body model can also be corrected by stratigraphic correction to adapt to the geological phenomena revealed by the borehole.

[0022] The core idea of ​​this solution to solve the corresponding technical problems in the prior art is embodied in: (1) Real-time data coupling and dynamic adjustment: In the prior art, the drilling trajectory design is separated from the geological body model. During the drilling process, the trajectory cannot be adjusted in real time to adapt to geological changes, resulting in the borehole deviating from the designed formation. This solution uses sensors to collect directional drilling data in real time and combines it with the geological body model for dynamic coupling. When the drilling trajectory deviates from the design target, the system can adjust the deflection intensity in time to ensure that the drilling proceeds along the predetermined trajectory.

[0023] (2) Dynamic correction of geological body model: Traditional geological models cannot be corrected in real time during the survey process, resulting in the model not being consistent with the actual geological conditions, affecting the accuracy of the survey results. This solution compares the geological phenomena revealed by the core drilling with those in the coupling model in real time. When differences are found, the geological model is adjusted in a timely manner to ensure that the model can accurately reflect the actual geological conditions.

[0024] (3) Synchronization of drilling and data collection: In the existing technology, geological data collection is delayed, and core logging is performed only after drilling is completed, which makes it impossible to interpret geological phenomena encountered during drilling in a timely manner, affecting exploration efficiency. This solution uses information technology to transmit drilling data to the back-end geological data collection system in real time, realizing the synchronization of drilling and data collection. Geologists can obtain data in real time during the drilling process, interpret geological phenomena in a timely manner, and improve exploration efficiency.

[0025] Example 1

[0026] This embodiment provides a coupling correction method based on directional drilling trajectory and geological body model, see Figure 3 , its implementation process includes the following steps: S1. Collect the drilling data of the directional drilling process and obtain the real-time data of the drilling trajectory; In this step, the drilling data is collected through sensors on the directional drilling system, which usually includes geological parameters used to evaluate the characteristics of the formation, engineering parameters used to reflect the working status of the drill bit, trajectory parameters used to spatially locate the borehole position, etc. This step mainly extracts trajectory parameter data, such as inclination, azimuth, tool face angle, etc.

[0027] S2, based on the real-time data of the drilling trajectory, the drilling trajectory is drawn in real time using 3D modeling software; In this step, the drilling trajectory can be drawn by processing the real-time data of the drilling trajectory based on the current mainstream 3D modeling software such as GOCAD or EVS (Earth Volumetric Studio).

[0028] S3, perform three-dimensional modeling based on the geological data formed in the early preliminary exploration stage to obtain a geological body model, and embed the real-time drawn drilling trajectory into the geological body model to form a coupled model; In this step, the data source for modeling the geological body model is the geological data formed in the early preliminary exploration stage. A borehole column chart is generated based on the geological data, which represents the lithology, stratigraphic stratification and other information at different depths in the form of vertical columns. Based on the information extracted from the borehole column chart, the continuous surface of the stratum is generated by the interpolation fitting method to obtain the geological body model.

[0029] In order to couple the drilling trajectory with the geological model, the interface between the directional drilling trajectory 3D display and the geological model can be compiled through the Python programming language, and the real-time drawn drilling trajectory can be embedded in the geological model to form a coupling model. In this coupling model, the drilling trajectory can be displayed in real time in the geological model, thereby clearly reflecting the spatial position of the current borehole in the geological model. The coupling model can be deployed in a local database or a cloud database according to needs.

[0030] S4. During the drilling process, based on the drilling trajectory, by comparing the geological phenomena revealed by the drilled core with the geological phenomena in the coupling model, it is determined whether directional drilling deflection correction or geological body model correction is required; In this step, the geological phenomena revealed by the drilled core include lithology, occurrence (dip, dip, strike), faults, structures, etc. Based on the drilling trajectory, the stratigraphic position of the current borehole in the geological body model can be clearly determined. By comparing the geological phenomena revealed by the drilled core with the geological phenomena of the stratigraphic position of the current borehole in the coupling model, it is determined whether directional drilling deflection correction or geological body model correction is required, as follows: If the drilling trajectory deviates from the designed trajectory, but the geological phenomena revealed by the core are consistent with the geological phenomena of the corresponding strata at the drilling location in the coupling model, it is judged that directional drilling deflection correction is needed.

[0031] If the drilling trajectory conforms to the designed trajectory, but the geological phenomena revealed by the core are inconsistent with the geological phenomena of the corresponding strata at the drilling location in the coupled model, it is judged that the geological body model needs to be corrected.

[0032] Among them, the directional drilling inclination correction is to recalculate the new inclination and azimuth target values ​​according to the trajectory deviation, and adjust the drill bit posture through the tool face angle to achieve trajectory correction, so that the drilling trajectory tends to the designed trajectory.

[0033] The geological model is modified to update the corresponding lithology, formation thickness, structural characteristics and other parameters in the geological model according to the data of the current drilled core, so that the model is closer to the actual geological conditions.

[0034] Based on the above, the directional drilling inclination and dynamic optimization of the geological body model can be realized during the drilling process. The optimization goal is to ensure that the borehole accurately enters the designed stratum. At the same time, the geological body model can accurately adapt to the geological phenomena revealed by the borehole.

[0035] Example 2

[0036] This embodiment provides a coupled correction system based on directional drilling trajectory and geological body model, see Figure 4 , which includes: The data acquisition module is used to collect the drilling data during the directional drilling process and obtain the real-time data of the drilling trajectory; The 3D modeling module is used to draw the drilling trajectory in real time using 3D modeling software based on the real-time data of the drilling trajectory; and to perform 3D modeling based on the geological data formed in the early preliminary exploration stage to obtain a geological body model; A coupling module is used to embed the real-time drawn drilling trajectory into the geological body model to form a coupling model; The comparison and correction module is used to determine whether directional drilling inclination correction or geological body model correction is needed during the drilling process based on the drilling trajectory by comparing the geological phenomena revealed by the drilled core with the geological phenomena in the coupling model.

[0037] It can be understood that since the corresponding functions of the various functional modules of the coupling correction system in this embodiment correspond to the step description of the coupling correction method in Example 1, the specific implementation of the method steps has been described in Example 1, and the specific implementation of each functional module will not be repeated here.

[0038] Finally, it should be noted that the above embodiments are only preferred implementations and are not intended to limit the present invention. It should be pointed out that for those skilled in the art, several modifications, equivalent replacements, improvements, etc. can be made without departing from the scope of the present invention and the scope of protection of the claims, and all of these should be included in the protection scope of the present invention.

Claims

1. A coupling correction method based on directional drilling trajectory and geological body model, characterized in that: The following steps are involved: S1. Collect the drilling data of the directional drilling process and obtain the real-time data of the drilling trajectory; S2, based on the real-time data of the drilling trajectory, the drilling trajectory is drawn in real time using 3D modeling software; S3, perform three-dimensional modeling based on the geological data formed in the early preliminary exploration stage to obtain a geological body model, and embed the real-time drawn drilling trajectory into the geological body model to form a coupled model; S4. During the drilling process, based on the drilling trajectory, by comparing the geological phenomena revealed by the drilled core with the geological phenomena in the coupling model, it is determined whether directional drilling inclination correction or geological body model correction is needed.

2. A coupling correction method based on directional drilling trajectory and geological body model as claimed in claim 1, characterized in that: The three-dimensional modeling software includes GOCAD or EVS.

3. A coupling correction method based on directional drilling trajectory and geological body model as claimed in claim 1, characterized in that: In step S3, the interface between the three-dimensional display of the directional drilling trajectory and the geological body model is compiled by using the Python programming language, and the real-time drawn drilling trajectory is embedded in the geological body model.

4. The coupling correction method based on directional drilling trajectory and geological body model according to claim 1, characterized in that: The coupling model is deployed in a local database or a cloud database.

5. The coupling correction method based on directional drilling trajectory and geological body model according to claim 1, characterized in that: In step S4, based on the drilling trajectory, by comparing the geological phenomena revealed by the drilled core with the geological phenomena in the coupling model, it is determined whether directional drilling deflection correction or geological body model correction is required, which specifically includes: If the drilling trajectory deviates from the designed trajectory, but the geological phenomena revealed by the core are consistent with the geological phenomena of the corresponding strata in the coupled model at the drilling location, it is judged that directional drilling deflection correction is needed; If the drilling trajectory conforms to the designed trajectory, but the geological phenomena revealed by the core are inconsistent with the geological phenomena of the corresponding strata at the drilling location in the coupled model, it is judged that the geological body model needs to be corrected.

6. A coupling correction system based on directional drilling trajectory and geological body model, characterized in that: include: The data acquisition module is used to collect the drilling data during the directional drilling process and obtain the real-time data of the drilling trajectory; 3D modeling module, used to draw the drilling trajectory in real time based on the real-time data of the drilling trajectory using 3D modeling software; And based on the geological data formed in the early preliminary exploration stage, three-dimensional modeling is carried out to obtain a geological body model; A coupling module is used to embed the real-time drawn drilling trajectory into the geological body model to form a coupling model; The comparison and correction module is used to determine whether directional drilling inclination correction or geological body model correction is needed during the drilling process based on the drilling trajectory by comparing the geological phenomena revealed by the drilled core with the geological phenomena in the coupling model.

7. A coupling correction system based on directional drilling trajectory and geological body model as claimed in claim 6, characterized in that: The 3D modeling software used by the 3D modeling module includes GOCAD or EVS.

8. A coupling correction system based on directional drilling trajectory and geological body model as claimed in claim 6, characterized in that: The coupling module compiles the interface between the three-dimensional display of the directional drilling trajectory and the geological body model through the Python programming language, and embeds the real-time drawn drilling trajectory into the geological body model.

9. A coupling correction system based on directional drilling trajectory and geological body model as claimed in claim 6, characterized in that: The coupling model is deployed in a local database or a cloud database.

10. A coupling correction system based on directional drilling trajectory and geological body model as claimed in claim 6, characterized in that: The comparison and correction module determines whether directional drilling deflection correction or geological body model correction is needed by comparing the geological phenomena revealed by the drilled core with the geological phenomena in the coupling model based on the drilling trajectory, specifically including: If the drilling trajectory deviates from the designed trajectory, but the geological phenomena revealed by the core are consistent with the geological phenomena of the corresponding strata in the coupled model at the drilling location, it is judged that directional drilling deflection correction is needed; If the drilling trajectory conforms to the designed trajectory, but the geological phenomena revealed by the core are inconsistent with the geological phenomena of the corresponding strata at the drilling location in the coupled model, it is judged that the geological body model needs to be corrected.

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