Downhole spiral flow shear vibration generator device

Abstract

The invention relates to a downhole spiral flow shear vibration generator device which is used for spiral flow to replace a well cementation in petroleum drilling engineering and mainly aims to increase spiral flow intensity of cementing fluid and improve cementing effect. The downhole spiral flow shear vibration generator device comprises a coupling, an outer cylinder and a stream-guiding seat which are connected in sequence. A spiral flow generator is fixed on the upper wall of the outer cylinder. A shear rotor, a vibration rotor and a spiral flow rotor are arranged on the lower portion of an inner hole of the outer cylinder in sequence. Due to the fact that the downhole spiral flow shear vibration generator device takes spiral flow, shear and radial vibration pulse technology into account, downhole spiral flow shear vibration is formed, strength property of set cement is improved, and cementing quality is improved.

Description

technical field [0001] The invention relates to a downhole swirl shear vibration generator device used for swirl displacement cementing in petroleum drilling engineering. Background technique [0002] The existing swirl displacement cementing generally adopts the helical flow displacement technology, which mainly has the following aspects: ①The movable casing swirl displacement cementing technology, the principle is to realize the helical flow of the cementing fluid by rotating the casing during the displacement process; the disadvantages : Because the rotating torque is too large and the rotating speed cannot be too fast, the cementing effect is not ideal; if the rotating speed is increased, the operation risk will increase, especially for highly deviated wells and horizontal wells, this technology is restricted even more. ②The cementing cyclone is used, which is mainly composed of an outer pipe, an inner pipe and a spiral flow channel. The flow channel of the cyclone is pr...

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Problems solved by technology

[0002] The existing swirl displacement cementing generally adopts the helical flow displacement technology, which mainly has the following aspects: ①The movable casing swirl displacement cementing technology, the principle is to realize the helical flow of the cementing fluid by rotating the casing during the displacement process; the disadvantages : Because the rotation torque is too large and the speed cannot be too fast, the cementing effect is not ideal; if the speed is increased, the operation risk will increase, especially for highly deviated wells and horizontal wells. This technology is even more restricted

②The cementing cyclone is used, which is mainly composed of an outer pipe, an inner pipe and a spiral flow channel. The flow channel of the cyclone is provided with a liquid inlet hole on the inner pipe, and a liquid outlet hole on the outer pipe. Put the inner pipe into the outer pipe and tighten the thread connecting the outer pipe with other pipes. This kind of cementing cyclone can improve the displacement effect of cement slurry to a certain extent; its disadvantage is that the cementing fluid needs to enter through the inner pipe The outer pipe can only be swirled during this process, which consumes a lot of kinetic energy of the cementing fluid, reduces the flow capacity of the cementing fluid, and also limits the swirl intensity generated

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