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Universal direction-prioritized landing control method based on steerable drilling
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A technology of landing control and directional drilling, which is applied in directional drilling and other directions, and can solve problems such as lack of versatility, direction-priority landing control scheme cannot be applied to rotary directional drilling, etc.
Active Publication Date: 2014-06-25
CHINA PETROLEUM & CHEM CORP +1
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However, the above three direction-priority landing control schemes are respectively aimed at different steering drilling methods and are not universal, that is, the direction-priority landing control scheme of sliding steering drilling cannot be applied to rotary steering drilling or compound steering drilling, so it is not universal
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Embodiment 1
[0067] figure 2 It is a flow chart of the design method of the landing control scheme of the present invention.
[0068] In step S101, the trajectory parameters of the bottom hole point b are calculated. The trajectory parameters include the inclination angle, azimuth angle and spatial coordinates of the bottom hole point b.
[0069] In the actual drilling process, by using MWD and other instruments to measure the actual drilling trajectory while drilling, the inclination measurement data such as well depth, inclination angle and azimuth angle of a series of measurement points can be obtained. For each measurement point, the measured well depth, The trajectory parameters such as space coordinates are calculated from well inclination angle and azimuth angle.
[0070] In general, there is always a certain distance between the last measuring point and the bottom of the well (at the drill bit), and the trajectory parameters of the bottom hole point b can be calculated by extrap...
Embodiment 2
[0131] The landing control method of the present invention will be further described below in conjunction with a specific embodiment.
[0132] When designing the direction-priority landing control scheme, the known data include: ① coordinates of the bottom point (N b ,E b , H b ) and borehole direction (α b , φ b ); ② target plane attitude parameters (α z , φ z ); ③ target coordinates (N t ,E t , H t ); ④ target direction (α e , φ e ). According to the above known data, some parameters can be obtained indirectly, such as: parameters (ΔN b,t , ΔE b,t , ΔH b,t ), (m N , m E , m H ), (g N , g E , g H ).
[0133] The flow of direction priority landing control method is as follows: Figure 5 shown.
[0134] In step S301, it is known from formula (3) that (ΔN b,e , ΔE b,e , ΔH b,e ) are only functions of λ, so the λ value can be obtained from the constraint equation of the landing trajectory, that is, the λ value can be obtained by formula (21).
[0135] In...
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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 petroleumdrilling engineering technology, in particular to a general method for priority landing control based on steering drilling direction. Background technique [0002] Wellboretrajectory 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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