Device and method for supporting yield increase fractures of ocean natural gas hydrate

Abstract

The invention discloses a device and method for supporting yield increase fractures of ocean natural gas hydrate. The device comprises a fracture monitoring section, a filling material prefabricated section, a filling section, an upper joint and a lower joint, wherein the upper joint, the fracture monitoring section, the filling material fabricated section, the filling section and the lower joint are connected together from top to bottom in sequence; the upper joint is connected to an upper drill column; and a locator is arranged on the periphery of the fracturing monitoring section. The device and method have the advantages that three-dimensional network skeleton structures are constructed in the fractures to extend and support the fractures and improve the seepage capability of the fractures, thereby improving the heat and mass transfer efficiency of an exploitation process, providing seepage channels for decomposing products and solving the problem of sediment blockage on the immediate vicinity of a wellbore; the energy loss of two-phase flowing caused by exploitation and product decomposition is reduced; lots of traditional fracturing fluid is prevented from flowing into a hydrate stratum; the purposes of stabilizing yield increase fracture structures, improving the rate of an exploitation project and prolonging the exploitation time are achieved; and the large-scale commercialized exploitation of the ocean hydrate is realized.

Description

technical field [0001] The invention relates to the field of commercial exploitation of marine hydrates, in particular to a device and method for supporting seabed natural gas hydrate stimulation fractures. Background technique [0002] Natural gas hydrate (Natural Gas Hydrate) is a clean and efficient emerging energy. Its reserves are huge. The reserves of total organic carbon in gas hydrates on the earth are about twice the sum of oil, natural gas and coal, and the resources of gas hydrates in marine areas account for 99% of the total resources. According to surveys, 90% of the world's oceans contain natural gas hydrates, and the continental slopes of the South my country Sea and the East China Sea also show great potential for the development of natural gas hydrates. [0003] At present, the main production methods of hydrates are: heat shock method, depressurization method, chemical reagent injection method and CO2 method. 2 Replacement method. The thermal shock metho...

AI Technical Summary

Problems solved by technology

The present invention can monitor the position and shape of fracturing stimulation fractures under the special reservoir conditions of loose seabed hydrate deposits and rich seawater, and perform fracture support work accordingly, build a three-dimensional network-like skeleton structure in the fractures, and extend and support the fractures And improve the seepage capacity of fractures to improve heat and mass transfer efficiency in the mining process, provide seepage channels for decomposition products, and solve the problem of sediment blockage near the wellbore

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