A method for combined exploitation of natural gas hydrate with radial horizontal well and pressure reduction heat injection

A natural gas and hydrate technology, applied in directional drilling, production fluid, drilling equipment and methods, etc., to achieve the effects of increasing gas production area, improving thermal efficiency, and increasing hot water heat exchange area

CN109630076BActive Publication Date: 2021-06-22JILIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-06-22

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Abstract

The invention discloses a method for combined exploitation of natural gas hydrate by radial horizontal wells and decompression heat injection, which belongs to the technical field of natural gas hydrate exploitation. On the casing of the formed natural gas hydrate drilling hole, sidetracking is used to open windows The radial horizontal well technology drills multiple horizontal wellbores in a radial shape, and uses high-pressure hot water jets to push the jet drill at the front end of the high-pressure hose to form multiple radial and horizontal mining channels with a length of about 100 meters. The convective heat transfer of the gas hydrate promotes the decomposition of natural gas hydrate, and the convective heat transfer in the far well area is enhanced by the method of joint depressurization. During the drilling process, high-efficiency mining is carried out by means of segmented heating. The invention has the advantages of simple process, low cost, high efficiency and easy realization, and is beneficial to realize large-scale commercial exploitation of natural gas hydrate.
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Description

technical field

[0001] The invention belongs to the technical field of natural gas hydrate exploitation, and in particular relates to a method for combining radial horizontal wells and depressurization heat injection to exploit natural gas hydrates. Background technique

[0002] In the international context of the shortage of fossil energy, natural gas hydrate was listed as the 173rd new mineral in China in 2017 due to its large reserves, wide distribution, high efficiency and cleanliness. According to experts' estimates, the carbon content of natural gas hydrate in the world is twice that of the current total carbon content of fossil fuels, and it is recognized as one of the most potential clean alternative energy sources. At present, the mining technologies of natural gas hydrate mainly include depressurization mining method, thermal excitation method, chemical reagent injection mining method and carbon dioxide displacement mining method.

[0003] The use conditions of th...

Examples

Embodiment Construction

[0020] Combine below figure 1 and figure 2 To further describe the specific implementation of the present invention in detail, the natural gas hydrate reservoir 11 is located below the upper overburden layer 10 .

[0021] The specific process of the combined production of natural gas hydrates by radial horizontal wells and decompression heat injection described in this embodiment is as follows: when drilling a natural gas hydrate production well, after the casing string 1 is run in, the outer string is run in tool, wherein the outer tubing string tool includes a tubing string 2, an anchor and a diverter 5, and the anchor and the diverter 5 are lowered to the target layer by hoisting the tubing string 2; the anchor is used to anchor the diverter 5 and the diverter 5 The tubing string 2 prevents transmission; the combination of the steering gear 5 and the universal joint 6 realizes the steering of the coiled tubing 3 from the vertical direction to the horizontal direction. Af...