Horizontal well drilling and drilling pressure compensating device

Abstract

The invention provides a horizontal well drilling and drilling pressure compensating device. The horizontal well drilling and drilling pressure compensating device comprises a lower joint main body and an upper joint main body, wherein the lower joint main body comprises a lower end external thread structure, a shoulder part and a neck part, and the shoulder part is of a cylindrical structure, anda neck structure is disposed at the center position of the cylindrical structure; large holes and small holes are formed in the ring-shaped surface of the cylindrical structure at equal intervals; the upper end of the upper joint body is an internal thread structure matched with a lower joint of a drilling pipe, the lower end of the upper joint body is of a shoulder structure, and a ring-shaped structure is arranged on the outer side of the lower end of the upper joint body; a lower joint main body end cover is arranged on the upper end surface of the lower joint body, the upper joint main body and the lower joint main body can be relatively displaced in the axial direction, and the lower joint main body shoulder part and the lower joint main body end cover can axially limit the upper joint main body and the lower joint main body end cover can limit the maximum relative displacement of the upper joint main body and the lower joint main body in the axial direction, a drilling pressurecompensator and a shock absorber are installed between the lower joint main body and the upper joint main body, and the horizontal well drilling and drilling pressure compensating device can compensate the drilling pressure while transmitting the torque and the pulling force, and has the characteristics of simple structure and easy realization.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas drilling, in particular to a drilling pressure compensation device for horizontal well drilling. Background technique [0002] In the process of horizontal well drilling, the pressure on bit is the main factor affecting the drilling speed and the life of the drill bit. If the bottom hole drilling pressure is too small, the drilling speed will be reduced. If the drilling pressure at the bottom of the hole is too high, the drill bit will be severely worn, which may cause the bit to break. Therefore, the stable bit pressure can improve the drilling speed and the life of the bit. However, during the drilling process of horizontal wells, the bottom-hole WOB is difficult to control due to the high friction in the horizontal section and the curved section. Most of the existing drilling rigs control the stability of the uphole WOB. Because the drill pipe is long and the bottom hole is compl...

AI Technical Summary

Problems solved by technology

However, in the process of drilling horizontal wells, the friction of the horizontal section and the curved section is large, and the bottom hole pressure is difficult to control.

Most of the existing drilling rigs control the stability of the drilling pressure on the well. Because the drill pipe is long and the bottom hole is complicated, it cannot accurately control the bottom drilling pressure, resulting in large fluctuations in the bottom drilling pressure

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