Dynamic control system and control method for downhole directional power drilling tool face

Abstract

The invention relates to a dynamic control system and a control method for a downhole directional power drilling tool face. The dynamic control system is characterized in that the dynamic control system comprises a set of tool face decoding system, a set of dynamic tool face control system, a set of top drive / turntable servo and brake system, a set of top drive / turntable angle sensing system and a set of top drive / turntable angle signal processing system; and the input end of the tool face decoding system is connected with the pressure signal sensor of a measurement while drilling (MWD) system in a well drilling system, the output end of the tool face decoding system is connected with the dynamic tool face control system, the dynamic tool face control system is preset in a monitoring computer, the output end of the dynamic tool face control system is connected with the top drive / turntable servo and brake system, the top drive / turntable servo and brake system is connected with a top drive / turntable and the top drive / turntable angle sensing system, the output end of the top drive / turntable angle sensing system is connected with the top drive / turntable angle signal processing system, and the output end of the top drive / turntable angle signal processing system is connected with the dynamic tool face control system. The dynamic control system and the control method can be widely used for the dynamic adjustment control of the downhole directional power drilling tool face.

Description

Technical field [0001] The invention relates to a control system and a control method for controlling tool faces during oil and gas field drilling, in particular to a downhole directional power drilling tool tool face dynamic control system and a control method. Background technique [0002] In the process of conventional drilling operations, the vertical section and the stable section usually use top drive or turntable rotary drilling. If the directional drilling section uses the downhole angle type deflection power drilling tool, the sliding drilling method is usually used. Under conditions such as adjustment, stratum lithology changes, and power drill tool wear, tool face drift is likely to occur, leading to problems such as failure of borehole trajectory control. In the face of this situation, the usual practice is to stop drilling and raise the tool to reset the tool face after the downhole tool face drifts. This will affect the operating timeliness. At the same time, in th...

AI Technical Summary

Problems solved by technology

[0002] In conventional drilling operations, the vertical well section and the stabilizing section are usually drilled by top drive or rotary drilling, and if the steering drilling section uses the downhole angled deflection power drilling tool, the sliding drilling method is usually used. Under the conditions of adjustment, stratum lithology change, power drilling tool wear and other conditions, it is easy to cause drilling tool face drift, resulting in failure of wellbore trajectory control and other problems

Faced with this situation, the usual practice is to reset the tool face by stopping drilling and lifting the drilling tool after the downhole tool face has drifted, which will affect the operating timeliness

At the same time, in the sliding drilling process of conventional steerable drilling tools, because the drilling tool cannot rotate, the application of drilling pressure is delayed, the wellbore cleaning is difficult, and it is easy to cause problems such as low operating efficiency and complicated procedures.

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