A concentric tube cuttings suction and crushing device suitable for dual-gradient drilling

Abstract

The invention discloses a concentric pipe rock debris sucking and crushing device suitable for dual-gradient drilling. The device is internally provided with a drilling fluid flowing channel providedwith two open axial ends, wherein the drilling fluid flowing channel is in shunted communication with a drilling fluid flowback channel, the inlet end of the drilling fluid flowback channel is locatedin the device, the outlet end of the drilling fluid flowback channel is provided with a crushing portion, the drilling fluid flowback channel is provided with a first jet flow throat portion and a second jet flow throat portion, and a mixing cavity is formed in the position, located between the first jet flow throat portion and the second jet flow throat portion, of the drilling fluid flowback channel. The device is also internally provided with an annulus drilling fluid upward-returning channel capable of making the device outside and the mixing cavity communicated, and the annulus drillingfluid upward-returning channel and the drilling fluid flowing channel are peripherally arranged in a spaced way. The concentric pipe rock debris sucking and crushing device suitable for dual-gradientdrilling facilitates horizontal drilling rock debris carrying, decreases rock debris beds, reduces the drilling cost and ensures safe and efficient drilling.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a concentric tube cuttings suction and crushing device suitable for dual-gradient drilling. Background technique [0002] As the oil and gas exploration conditions become more and more complex, the drilling complexity is also increasing. Although refined MPD technology has solved some problems, it still cannot meet the problem of multiple pressure systems in the same open hole section. Concentric tube drilling is a dual-gradient drilling technology that can precisely control the bottom hole pressure. It can realize closed-loop circulation of drilling fluid and can solve many limitations of existing conventional drilling technologies. In addition, the RTS system in the concentric tube drilling uses double-walled drill pipes to provide power and data transmission channels downhole, and realizes the wired transmission of data. Therefore, the RTS system is more common in ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a concentric tube cuttings suction and crushing device suitable for dual-gradient drilling, which overcomes the problems of complicated operation, time-consuming drilling stoppage, high cost, and poor safety in the prior art. The concentric tube cuttings suction and crushing device for gradient drilling facilitates cuttings carrying in horizontal wells, reduces the generation of cuttings beds, reduces drilling costs, and provides a guarantee for safe and efficient drilling

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