Combined mining method with decompression and heating in multi-branched horizontal wells for marine hydrate
A horizontal well and multi-branch technology, which is applied in the direction of underwater drilling, fluid production, earthwork drilling and production, etc., to achieve the effects of reducing the pressure drop at the bottom of the well, prolonging the duration of test production, and increasing the decomposition surface
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[0047] Example 1, such as figure 1 As shown, the multi-branch horizontal well decompression heating combined mining method for marine hydrate is based on the well structure of the main borehole and multi-branch horizontal well, and uses hydraulic slotting and heating control means to connect three-dimensional scattered ore bodies To adapt to the depressurization of hydrate production in silty reservoirs.
[0048] Specifically, the following implementation steps are included:
[0049] (1) The main wellbore completed
[0050] The drilling method of the main wellbore is to drill the upper formation of the hydrate reservoir and then cement the well to form a 16” main wellbore. The main wellbore passes through the reservoir and leaves sand at the bottom below the bottom boundary pocket;
[0051] The completion method of the main wellbore is casing completion, and the casing has reserved holes for docking with the multi-branch horizontal well; cement is used between the casing an...
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