Power rotary guiding shoe for well cementation and completion pipe string

Abstract

The invention provides a power rotary guide shoe for a well cementation and completion pipe string, which comprises a shell, a guide rod, a guide rod and a driving device, and is characterized in that the lower end of the shell is fixedly connected with an outer shaft sleeve; the impeller shaft sleeve is concentrically arranged in the shell; the transmission shaft inner sleeve is fixedly connected to the lower end of the impeller shaft sleeve, a circulating through hole is formed in the side wall of the transmission shaft inner sleeve, and a radial annulus is formed among the shell, the impeller shaft sleeve and the transmission shaft inner sleeve; the impeller set is arranged in the radial annular space, the impeller set is arranged on the periphery of the impeller shaft sleeve in a sleeving mode, and the impeller set is axially and fixedly connected with the impeller shaft sleeve; the eccentric guide head is fixedly connected to the lower end of the transmission shaft inner sleeve; wherein in the first state, the power rotary guiding shoe can enable the circulating through hole to be communicated with the radial annulus to form a first circulating channel, drilling fluid can impact the impeller set to rotate and drive the eccentric guiding head to rotate, and therefore the power rotary guiding shoe is guided to enter the shaft, and in the second state, the power rotary guiding shoe can be closed to form a second circulating channel. And the drilling fluid performs well cementation operation through the second circulating channel.

Description

technical field [0001] The invention belongs to the technical field of oil and natural gas exploration and development cementing operations, and particularly relates to a dynamic rotary guide shoe used for cementing and completing a pipe string. Background technique [0002] In the cementing and completion operations of oil and gas exploration and development, whether the casing can be smoothly lowered to the bottom of the well is the key to the entire construction operation. With the continuous increase of drilling and completion well depths, more and more complex formations are encountered during drilling, which brings great technical difficulties to casing running in cementing and completion operations. At present, in the prior art, unpowered casing shoes are usually used for operation. During the process of unpowered casing guide shoe, once the casing is blocked, it can only be solved by means of movable drilling tools, which can easily lead to a series of vicious downh...

AI Technical Summary

Problems solved by technology

[0003] However, although the existing rotary guide shoes realize the rotation function of the steering head, they generally have defects in the rotation torque, throttling pressure drop during the cementing process, and the drillability of the cementing sweep.

For example, the rotation torque is small, resulting in poor rotation and obstacle removal effect when the casing is running, and the pressure drop of the circulation throttling is large, which makes the construction pressure of the cementing operation high, resulting in the failure of the cementing operation

After cementing, the inner casing of the sweeping plug guide shoe rotates, and the cleaning of cement and inner casing cannot be completed, and it is difficult to carry out the next drilling construction

This has seriously affected the application of rotary guide shoes in actual production operations

Images