Reservoir stimulation device and method for improving recovery of hydrate reservoirs

Abstract

The invention relates to a hydrate reservoir reforming device for enhancing oil recovery, comprising: a drilling fluid pump, a well wall proppant pump, a fluid injection head, a drill pipe, a rubber plug assembly, a support ring, a drill bit; a drilling fluid pump and The well wall proppant pump is respectively connected to the drilling fluid storage tank and the well wall proppant storage tank, and injects the drilling fluid and the well wall proppant into the fluid injection head; the fluid injection head is located on the offshore platform and connected to the top of the drill pipe. A drill bit is installed at the bottom of the drill pipe, and the drilling fluid or well wall proppant enters the wellbore through the drill pipe through the drill bit; the rubber plug assembly and the supporting ring are installed in the drill pipe, and the distance between the rubber plug assembly and the fluid injection head should be greater than that of the branch The length of the wellbore, the support ring is installed at a position more than 50m away from the drill bit. Compared with the prior art, the present invention can effectively improve the production capacity, injection capacity and sweep efficiency of hydrate mining; while effectively improving the mining efficiency, the well wall stability can be improved, and the development risk can be reduced.

Description

technical field [0001] The invention belongs to the field of natural gas hydrate exploitation, and in particular relates to a hydrate reservoir transformation device and method for improving recovery. Background technique [0002] As a new energy source, natural gas hydrate has the advantages of large reserves, wide distribution, high energy density, and clean and pollution-free. About 27% of the world's land and 90% of the sea are distributed in natural gas hydrate, and its resource reserves are equivalent to twice the amount of conventional fossil resources. my country's preliminary proven sea areas have at least 7×10 10 The t equivalent of natural gas hydrate is equivalent to half of the oil and natural gas resources on land. A unit volume of natural gas hydrate can release 160-180 volumes of natural gas. Therefore, the heat released by the combustion of natural gas hydrate is far greater than that of traditional fossil fuels such as coal, and has the characteristics o...

AI Technical Summary

Problems solved by technology

However, in the process of mining hydrates in horizontal wells, the continuous decomposition of hydrates leads to local deformation of the soil around the wellbore, and the longer extension of the hydrate layer in the horizontal well will make the soil around the wellbore more prone to instability and induce Sand, well wall collapse and other accidents

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