A General Method for Priority Landing Control Based on Steering Drilling Direction

Abstract

The invention discloses a universal direction-prioritized landing control method based on steerable drilling. The universal direction-prioritized landing control method includes calculating trajectory parameters of shaft bottom points according to survey data acquired by measurement while drilling; creating universal landing trajectory constraint equations applicable to various steerable drilling modes under the condition of preferentially meeting target-in direction requirements; selecting target-in directions within the actually engineering allowable ranges of hole drift angles and azimuth angles, and calculating well section lengths of landing trajectories and coordinates of target-in points in target planes according to the universal landing trajectory constraint equations; judging whether or not target-in positions meet engineering requirements and are in the range of target regions; dividing the allowable ranges of the hole drift angles and the azimuth angles into grid cells by grid lines, and taking intersections of the grid lines as the target-in directions to acquire the corresponding target-in positions; refining grids gradually according to the target-in directions and the target-in positions to acquire optimal landing control schemes. The universal direction-prioritized landing control method has the advantages of simple technology, few processes, simple and clear technical scheme, high practicability and the like.

Description

technical field

[0001] The invention relates to petroleum drilling engineering technology, in particular to a general method for priority landing control based on steering drilling direction. Background technique

[0002] Wellbore trajectory control is a complex multi-disturbance control process. It is impossible to completely match the actual drilling trajectory with the designed trajectory, and a certain error between the two is allowed in engineering. When the error between the two is large, it is necessary to revise the design of the wellbore trajectory from the current bottom of the well to the target point. There are two main schemes for the design of this modified trajectory (also known as the borehole to be drilled): one is the target control scheme, which only requires hitting a given target area, and the inclination angle and azimuth of the target area Angles are not strictly limited. The second is the soft landing control scheme. The soft landing control scheme ...

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