Construction method of one-time excavation for large-section vertical well
The invention relates to a construction method of one-time excavation for a large-section vertical well. The method comprises the following steps: from a wellhead to the inner part of a pioneer well with the diameter of 1.4m, approximately horizontal holes radiating in an annular direction are drill...
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Main Authors | , , , , , , , , , , , , |
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Format | Patent |
Language | Chinese English |
Published |
03.07.2013
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Subjects | |
Online Access | Get full text |
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Summary: | The invention relates to a construction method of one-time excavation for a large-section vertical well. The method comprises the following steps: from a wellhead to the inner part of a pioneer well with the diameter of 1.4m, approximately horizontal holes radiating in an annular direction are drilled in the pioneer well by using a suspension cage as an operation platform, pore-creating is achieved for one time from the bottom to the top; charging and blasting in a subsection manner are performed from the bottom to the top; slag materials fall to the lower part under the action of gravity; and the one-time excavation of the pioneer well is achieved quickly from the bottom to the top in a subsection manner. According to the technology of the method disclosed by the invention, supporting measures for a temporary well wall are not required; artificial drossing is not required; construction speed is fast; construction safety can be ensured; and construction cost is low. |
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Bibliography: | Application Number: CN2013189299 |