Full-rotating dynamic pointing type rotating guide system and guide controlling method

Abstract

The invention discloses a full-rotating dynamic pointing type rotating guide system and guide controlling method. The full-rotating dynamic pointing type rotating guide system comprises an upper shell body and a lower shell body. A hollow shaft coaxial with the upper shell body is arranged in the upper shell body, one end of the hollow shaft is connected with the upper shell body in a sealing mode, the other end of the hollow shaft is connected with a hollow transmission shaft, and a guide driving mechanism is arranged between the end of the hollow shaft and the upper shell body; the guide driving mechanism, the upper shell body and the hollow shaft form an oil pressure closed cavity, and the pressure of drilling liquid in the oil pressure closed cavity is higher than the pressure of drilling liquid outside the guide driving mechanism; the guide driving mechanism drives a deflection wheel mounted on the transmission shaft in a sleeving mode to conduct lateral deflection; a universal joint used for keeping the pointing direction is mounted on the transmission shaft; a drill is mounted at the end of the transmission shaft; and the deflection wheel conducts lateral deflection under driving of the guide driving mechanism and pushes the inner wall of the lower shell body outward and continuously in an abutting mode, and dynamic continuous lateral force with the direction being perpendicular to the inner wall of the lower shell body is produced, so that the lower shell body drives the drill to rotate by a certain angle along the rotating center of the universal joint to achieve the purpose of dynamic pointing.

Description

technical field [0001] The invention relates to advanced oil and gas drilling equipment technology, in particular to a rotary steerable drilling technology, which can be applied to directional drilling in different formations on sea and land. Background technique [0002] Rotary steerable drilling technology is a new drilling technology developed in the 1990s with rotary steerable drilling tools as the core. By controlling the wellbore trajectory in real time, it can accurately hit the drilling target. It has high mechanical penetration rate and high precision of wellbore trajectory control. The wellbore cleaning effect is good, and the displacement extension ability is strong, which is a qualitative leap from the traditional directional drilling technology. Rotary steerable drilling technology is becoming an important drilling method for various types of complex structure wells (horizontal wells, extended-reach wells, multilateral wells, 3D multi-target wells, and thin pay ...

AI Technical Summary

Problems solved by technology

Its disadvantages are: because the drive shaft of the drill bit needs to be bent, the position of the drive shaft is easy to wear, the strength of the drill string is not as good as that of the push-on type, and the inclination rate of the hard formation is low

However, the hybrid rotary steerable system still uses intermittent pulse force to achieve steering, and the drill bit will deflect during the time interval of the pulse force. On the other hand, whether the steering angle needs to be changed downhole, the push mechanism will provide lateral push force to deflect the direction of the drill bit

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