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
MIYAJIMA SHIN
Application Number:
JP2016048983A
Publication Date:
September 23, 2016
Filing Date:
March 11, 2016
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP
International Classes:
E21B17/00; E21B7/06
Domestic Patent References:
JPS61213347A | 1986-09-22 | |||
JP2003522866A | 2003-07-29 | |||
JP2011144562A | 2011-07-28 | |||
JPS5280236A | 1977-07-05 | |||
JPS5373819A | 1978-06-30 | |||
JPS52151214A | 1977-12-15 | |||
JP2004503386A | 2004-02-05 |
Foreign References:
WO2012116036A2 | 2012-08-30 | |||
CN1443247A | 2003-09-17 | |||
WO2001059249A2 | 2001-08-16 | |||
US4436118A | 1984-03-13 | |||
US6375895B1 | 2002-04-23 |
Attorney, Agent or Firm:
Ascend Patent Business Corporation