Followed vibration well cementation method

Abstract

The invention discloses a followed vibration well cementation method. In the method, in the well cementation process, a rubber plug moves in a sleeve downwards and simultaneously vibrates, and after the rubber plug moves downwards to the well bottom and touches and presses a float collar to make the float collar stop, the rubber plug continuously vibrates until cement slurry is about to be jelled. Through the method, the followed vibration in the whole well section from the well mouth to the well bottom can be implemented, the defect of single function of the rubber plug is overcome, and the aim of moving the sleeve of the whole well section is fulfilled, so that the sleeve and cement interface cementing quality is improved, the cement stone strength is improved and better application effect is achieved; and on the basis of not changing the conventional production and construction processes, the replacement function of the conventional rubber plug is still utilized, a sleeve resonanceprinciple is applied, and when the rubber plug moves in the sleeve, the followed vibration in the whole well section from the well mouth to the well bottom is implemented, so that the defect of single function of the rubber plug is overcome, vibration waves having the frequency same as the natural frequency of the sleeve of the oil well can be generated, and the well cementation quality is effectively and obviously improved.

Description

technical field [0001] The invention relates to the technical field of well cementing technology in petroleum drilling and well completion engineering, and aims at improving and improving the well cementing quality, especially the accompanying vibration well cementing method. Background technique [0002] Vibration cementing is a quality improvement technology in well completion engineering, which is used to improve the displacement efficiency of jacking cement slurry, increase the strength of cement stone, and improve the bonding quality of cement. [0003] In the 1960s, the United States and the Soviet Union successively mobilized high-level scientific research institutions to conduct indoor and outdoor experiments and mechanism research, which made the technology flourish. Nearly 100 wells in five oil fields in the former Soviet Union have successfully used their own vibration cementing technology. Domestic system research began in 1990. In 1994, Daqing Drilling Institute...

AI Technical Summary

Problems solved by technology

Although the principle of this technology is the same as that of the present invention, there are great differences in construction technology, structure type and mode of action.

[0005] In addition, the known bumper plugs are constructed of rubber wings, rubber cores, sealing rings, and (circlips). When the slurry replaces the cement slurry, the rubber plug is pressed down into the oil well casing, and the rubber wings scrape the inner wall of the casing to remove the cement slurry attached to the inner wall and the residue of the drilling fluid. hoop), but the general cementing plug has a single function, only has the function of scraping the inner wall of the casing and bumping, but cannot move the casing, and has no direct correlation with the cementing quality

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