Drilling trajectory design method and system based on bat algorithm and borehole wall stability
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A bat algorithm and wellbore stabilization technology, applied in the field of drilling trajectory design methods and systems, can solve the problems of not considering the influence of formation factors, unable to meet requirements, and not suitable for technical engineering practice.
Active Publication Date: 2018-11-27
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology
[0003] At present, the optimization of drilling trajectory is only optimized for a single index, and the influence of formation factors is mostly not considered
Facing the complex geological drill
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Embodiment 1
[0047] Embodiments of the present invention provide a three-dimensional drilling trajectory design method based on bat algorithm and well wall stability constraints, which can effectively reduce drilling costs and lay a good foundation for intelligent control of geological exploration drilling processes.
[0048] see figure 1 , the present invention's three-dimensional drilling trajectory design optimization method based on bat algorithm and wellbore stability constraints comprises the following steps:
[0049] Step S100: Based on the three-dimensional drilling trajectory model established by the spatial geometry, the drilling footage cost objective function and the equality constraints of the drilling trajectory optimization model are constructed.
[0050] Such as figure 2 Shown is a schematic diagram of three-dimensional trajectory analysis. In the figure, point A is the initial point position of the drill bit, and point D is the target point position where the drill bit i...
Embodiment 2
[0097] A certain well section is combined with the schematic diagram of the three-dimensional drilling trajectory model of the present invention above, and the constraints obtained by measurement and calculation are shown in Table 1.
Well inclination angle range of the stabilizing section
70-90
Azimuth Angle Range of Stabilization Section
160-340
[0100] Compared with the results obtained by using the bat intelligent search algorithm and the traditional genetic algorithm, the results are shown in Table 2.
[0101]
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Abstract
The invention discloses a drilling trajectory design method and system based on a bat algorithm and borehole wall stability. The optimization work is carried out in three steps, firstly, analytic modeling is carried out on a three-dimensional drilling trajectory, and a target function and equality constraint conditions of a drilling trajectory optimization model are obtained; then inequality constraint conditions of the drilling trajectory optimization model are obtained through borehole wall stability analysis; and lastly, an intelligent bat search algorithm is utilized to optimize parameters. The method overcomes the defects that the key formation environment parameter of the borehole wall stability and the intelligent bat search algorithm are not formed into a unified framework in a previous drilling trajectory design optimization method, and massive calculation is carried out by using a manual trial-and-error method. Compared with a traditional manual calculation and genetic intelligence algorithm, the drilling cost index and design time of the borehole trajectory design are reduced, the design precision is improved, and a good foundation is laid for trajectory optimization control in the process of geological exploration drilling.
Description
technical field [0001] The invention belongs to the field of intelligent control of the geological exploration drilling process, and in particular relates to a drilling trajectory design method and system based on bat algorithm and well wall stability. Background technique [0002] my country is rich in deep mineral resources, but deep geological exploration technology is still immature. To ensure national resource and energy security, it is necessary to promote technological innovation in deep geological drilling and establish intelligent decision-making and drilling control methods that meet the needs of complex geological drilling. Drilling trajectory design and optimization is one of the keys to achieve efficient and safe drilling under complex geological conditions. Improper drilling trajectory design may lead to low efficiency, and even drilling accidents and misses. Therefore, the establishment of a three-dimensional optimized drilling trajectory is the benchmark for ...
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