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Title:
EXTENDED DIRECTIONAL DRILLING
Document Type and Number:
WIPO Patent Application WO/2018/046757
Kind Code:
A3
Abstract:
The present invention relates to drilling (particularly horizontally) a borehole in ground. In order to provide an extension in particular in term of run length of a drilling in ground in comparison to conventional trenchless approaches, a buoyancy enhanced drillpipe module is proposed, comprising a pipe, a first and a second connection unit fixed to the respective ends of the pipe, the connection units each allowing a connection of the drillpipe module respectively with another drillpipe module, and a passage for drilling fluid, wherein at least in a part of the space between the first and second connection unit a buoyancy unit is provided, wherein, for a drilling fluid having a density in the range of 1.0 to 1.1 kg/l and/or a debris laden drilling fluid having a density in the range of 1.1 to 1. 5 kg/l, the buoyancy unit has a lower density than the drilling fluid and wherein the drillpipe module is dimensioned such a ratio between an absolute value of an effective weight force per meter of the drillpipe module in debris laden drilling fluid, with drilling fluid in the passage, and a total cross section of those elements of the drillpipe module that are due to transfer axial force is < 10,000 N/m³.

Inventors:
KÖGLER RÜDIGER (DE)
Application Number:
PCT/EP2017/072883
Publication Date:
April 19, 2018
Filing Date:
September 12, 2017
Export Citation:
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Assignee:
KOEGLER RUEDIGER (DE)
International Classes:
E21B7/04
Domestic Patent References:
WO1986004950A11986-08-28
WO2004099556A12004-11-18
Foreign References:
US20120031616A12012-02-09
GB2163465A1986-02-26
US4949797A1990-08-21
US6443244B12002-09-03
US20160084013A12016-03-24
Attorney, Agent or Firm:
EISENFÜHR SPEISER PATENTANWÄLTE RECHTSANWÄLTE PARTGMBB (DE)
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