Control method for hold pattern of rotary steering drilling
A technology of rotary steerable drilling and mode control, which is used in the automatic control system of drilling, directional drilling, drilling equipment, etc.
Active Publication Date: 2017-05-10
BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS
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Problems solved by technology
[0004] The purpose of the present invention is to provide a solution to the deficiencies of the existing technology, which may cause problems in the measurement of the azimuth of the downhole fluxgate under strong geomagnetic interference, which may cause the drilling direction to remain stable and forward when the steady-deviation drilling turns. A Steady Mode Control Method for Rotary Steerable Drilling with Major Deviation
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[0024] A kind of rotary steerable drilling stabilization mode control method proposed by the present invention will be further introduced below in combination with the accompanying drawings and embodiments:
[0025] The invention discloses a control method of a rotary steerable drilling mode for stabilizing the deviation. The control method includes a downhole control method for stabilizing the deviation and an operation method for disturbed formations.
[0026] The downhole control method for stabilizing the deviation comprises the following steps:
[0027] Step 1: The downhole control equipment measures the current well inclination angle and the high side tool face angle in real time;
[0028] Step 2, the downhole control equipment is pre-booked with the target well inclination angle, translation force strength, and deflection force strength; the left and right sides of the translation force strength are divided into 5 levels and 0, and the level 5 to the left is 100% of the...
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The invention belongs to the technical field of oil exploitation, and particularly relates to a control method for a hold pattern of rotary steering drilling. The control method comprises a hold downhole control sub method and an operating sub method on an interfered stratum. The hold downhole control sub method comprises the following steps that firstly, the current hole drift angle and the high side tool face angle are measured in real time through downhole control equipment; secondly, the target angle of inclination, the translational force strength and deflecting force strength are set in the downhole control equipment in advance, and the translational force strength are from zero to the fifth level; and thirdly, the current angle of inclination and the target angle of inclination are compared in real time through the downhole control equipment, and the vector sum of the required deflecting force and the set translational force is the force required to be output by downhole hydraulic equipment when the current angle of inclination is greater than the target angle of inclination; and when the current angle of inclination is smaller than the target angle of inclination, the deflecting force output by hydraulic execution equipment is opposite to the direction of a high side, the deflecting force is considered as negative at the time, and the vector sum of the deflecting force and the set translational force is the force required to be output by the downhole hydraulic equipment.
Description
technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a control method for a rotary steerable drilling stabilization mode. Background technique [0002] With the improvement of oilfield development and production needs, directional drilling technology is more and more widely used. The existing commercial application of rotary steerable drilling generally adopts the downhole closed-loop method during the drilling process of the stabilizing section, that is, the control module of the steering equipment controls the stabilizing section according to the well inclination and azimuth information measured near the bit. It is necessary to drill straight without changing the azimuth and well deviation; or due to technical limitations, the large closed-loop control method on the well is adopted, that is, the well deviation and azimuth information measured by MWD is analyzed by the computer on the well, and then the ...
Claims
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IPC IPC(8): E21B44/00E21B7/04
CPCE21B7/04E21B44/00
Inventor 吴文晋白玉新解庆
Owner BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS