Hydrate jet recovery device with double-layer pipe forward and reverse injection function

Abstract

The invention discloses a hydrate jet recovery device with a double-layer pipe forward and reverse injection function. The hydrate jet recovery device comprises an outer pipe, an inner pipe, an innerpipe upper joint, an inner pipe lower joint, a check valve and a sliding block, wherein the outer pipe consists of three sections, the upper end of the outer pipe is connected with an outer pipe of adouble-layer continuous pipe, and the lower end of the outer pipe is connected with downhole tools such as a drill bit; the upper part of the inner pipe is in plug-in sealing connection with an innerpipe of the double-layer continuous pipe through the inner pipe upper joint, and nozzle sleeves are inserted in jet holes in the walls of the inner pipe and the outer pipe to form circumferential fixation; the check valve is fixed by steps at the upper section and the middle section of the outer pipe; and a sliding block can freely slide in an inner pipe cavity. According to the hydrate jet recovery device, the switching of pilot hole drilling and dragging crushing of hydrate exploitation can be realized, the drilling cost is reduced, the drilling-down time is shortened, and the drilling and recovery efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate exploitation, in particular to a hydrate jet recovery device for front and back injection of double-layer pipes. Background technique [0002] Natural gas hydrate, also known as "combustible ice", is an unconventional energy source with high density and high calorific value. It is mainly distributed in the seabed and land permafrost deposits, of which marine resources account for more than 99% of the total. In the case of dwindling oil and gas resources, natural gas hydrate, as a new energy source with the largest untapped reserves, has great prospects. [0003] The solid-state fluidized mining method is proposed for the sampling of hydrates in my country's sea areas, which can reduce the possible environmental risks caused by the decomposition of shallow hydrates and achieve green and controllable mining. The existing solid-state fluidized mining technology requires two stages of pil...

AI Technical Summary

Problems solved by technology

The existing solid-state fluidized mining technology requires two stages of pilot drilling and jet crushing and recovery, and tools need to be replaced, so continuous mining cannot be realized

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