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Title:
EXCAVATION METHOD OF WELL, AND DRILL PIPE AND TOOL JOINT USED IN EXCAVATION METHOD
Document Type and Number:
Japanese Patent JP2016169593
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an excavation method of a well capable of suppressing abrasion in the inner surface of a casing.SOLUTION: An excavation method comprises the steps of inserting a casing formed by connecting a plurality of steel pipes into a well and performing inclined excavation by inserting a drill string having a plurality of drill pipes and a tubular tool joint 7 connecting end parts of the drill pipes with each other into the casing. The respective surface of the drill pipes and/or the tool joint 7 has a steel coating film 10 in which the total content of Cr and Ni is, by mass%, 1% or less (including 0%).SELECTED DRAWING: Figure 4

Inventors:
MATSUMOTO KEIJI
MIYAJIMA SHIN
Application Number:
JP2016048983A
Publication Date:
September 23, 2016
Filing Date:
March 11, 2016
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP
International Classes:
E21B17/00; E21B7/06
Domestic Patent References:
JPS61213347A1986-09-22
JP2003522866A2003-07-29
JP2011144562A2011-07-28
JPS5280236A1977-07-05
JPS5373819A1978-06-30
JPS52151214A1977-12-15
JP2004503386A2004-02-05
Foreign References:
WO2012116036A22012-08-30
CN1443247A2003-09-17
WO2001059249A22001-08-16
US4436118A1984-03-13
US6375895B12002-04-23
Attorney, Agent or Firm:
Ascend Patent Business Corporation