High-pressure water jet conveying device

Abstract

The invention provides a high-pressure water jet conveying device which comprises a continuous pipe column, an external pipe column which forms a high-pressure water jet injection annulus with the continuous pipe column in an enclosing mode, a movable sealing assembly which seals the injection annulus and a pressure transmitting channel which provides sealing pressure for the movable sealing assembly. The two connecting rods are arranged on the external tubular column; the dynamic sealing assembly shrinks in the radial direction to tightly hold the continuous pipe column when fluid is injected into the pressure transmission channel. And a through hole for communicating the injection annulus with the interior of the continuous tubular column is formed in the continuous tubular column. The rock breaking device has the advantages of reducing hydraulic loss, improving rock breaking efficiency, being simple and compact in structure and the like.

Description

technical field [0001] The invention relates to the field of oil and gas drilling and rock breaking, in particular to a high-pressure water jet conveying device. Background technique [0002] There are a large number of fractures and caves around the wellbore in existing carbonate reservoirs, which require radial hydraulic jet drilling and completion technology to achieve all-round communication and greatly improve the degree of reserve production. The existing high-pressure water jet delivery method is to inject high-speed fluid from the continuous pipe string, and break the rock through the nozzle at the end of the continuous pipe string to realize rock-breaking drilling. Due to the small diameter of the continuous pipe string, the friction resistance of its transportation method is large, and the hydraulic loss along the way is large. Under the condition of a certain total hydrodynamic force, the hydrodynamic force of the injection is insufficient, which affects the rock ...

AI Technical Summary

Problems solved by technology

Due to the small diameter of the continuous pipe string, the friction resistance of its transportation method is large, and the hydraulic loss along the way is large. Under the condition of a certain total hydrodynamic force, the hydrodynamic force of the injection is insufficient, which affects the rock breaking efficiency, which is more obvious in the deep formation of the reservoir; However, the method of achieving rock-breaking efficiency by increasing the total hydrodynamic force is high in cost and poor in economy.

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