Recherche dans les collections de brevets nationales et internationales
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International application No. Applicant's or agent's file reference
PCT/GB2018/052658 P210439WO/CW
International filing date (day/month/year) (Earliest) Priority Date (day/month/year)
18 September 2018 26 September 2017
FOR FURTHER ACTION: See Form PCT/ISA/220 as well as, where applicable, item 5 below.
This international search report has been prepared by this International Searching Authority and is transmitted to the applicant according to Article 18. A copy is being transmitted to the International Bureau.
It is also accompanied by a copy of each prior art document cited in this report.
1. Basis of the report
a. With regard to the language, the international search was carried out on the basis of:
the international application in the language in which it was filed.
a translation of the international application into                                          which is the language of a translation furnished for the purposes of international search (Rules 12.3(a) and 23.1(b)).
This international search report has been established taking into account the rectification of an obvious mistake authorized by or notified to this Authority under Rule 91 (Rule 43.6bis(a)).
With regard to any nucleotide and/or amino acid sequence disclosed in the international application, the international search was carried out on the basis of a sequence listing:
2. Certain claims were found unsearchable
3. Unity of invention is lacking
4. Title of the invention
The text is approved as submitted by the applicant.
The text has been established by this Authority to read as follows:
5. Abstract
The text is approved as submitted by the applicant.
The text has been established, according to Rule 38.2, by this Authority as it appears in Box No. IV. The applicant may, within one month from the date of mailing of this international search report, submit comments to this Authority.

A method of controlling a well in a geological structure, the well comprising: a first casing string (12a), and a second casing string (12b) at least partially inside the first casing string thus defining a first inter-casing annulus therebetween. A primary fluid flow control device (16a), such as a wirelessly controllable valve, is provided in the second casing string (12b) to provide fluid communication between the first inter-casing annulus(14a) and a bore (14b) of the second casing string (12b). In the event of well "blow-out", a relief well (40) may be drilled and a fluid communication path formed between the relief well and the first casing string of the well rather than extend to lower and/or narrower sections of casing. A kill fluid can then be introduced via the relief well (40) and the primary fluid flow control device (16a) used to direct fluid to the second casing bore(14b). Further casing strings (12c) may be part of the well, and include corresponding flow control devices (16b), allowing the kill fluid to cascade down the well to control it. Accordingly, the time taken to drill a relief well to a shallower depth than is conventional can reduce the time and cost to control the well and can mitigate environmental impact of hydrocarbon loss caused by the blow-out.

6. Drawings
The figure of the drawings to be published with the abstract is Figure No.     1    
as suggested by the applicant.
as selected by this Authority, because the applicant failed to suggest a figure.
as selected by this Authority, because this figure better characterizes the invention.
none of the figures is to be published with the abstract.


     E21B 29/06 (2006.01)i; E21B 29/08 (2006.01)i; E21B 34/06 (2006.01)i; E21B 43/17 (2006.01)i; E21B 7/04 (2006.01)i
According to International Patent Classification (IPC) or to both national classification and IPC


Minimum documentation searched (classification system followed by classification symbols):
Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched:
Electronic data base consulted during the international search (name of data base and, where practicable, search terms used):
EPO-Internal, WPI Data


Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No.
US 2015240592 A1 (ROSS SHAUN COMPTON [GB] ET AL) 27 August 2015 (2015-08-27)
paragraphs [0019], [0025], [0036], [0037], [0038], [0048], [0114], [0126] - [0129]; figure 1
WO 2016057014 A1 (HALLIBURTON ENERGY SERVICES INC [US]) 14 April 2016 (2016-04-14)
page 3, l.26-33, page 4, l.1-17;figure 1
Mikolaj Ralowski, "Design of a hypothetical relief well for a shallow reservoir, possible challenges.", Stavanger 30 May 2016 (2016-05-30), page 15-32,
Retrieved from the Internet:
[retrieved on  2018-11-30]
page 25, fig.13;page 15 - page 35
WO 2011067372 A1 (WELLTEC AS [DK]; HALLUNDBAEK JOERGEN [DK]; HAZEL POUL [GB]) 09 June 2011 (2011-06-09)
the whole document
WO 2017027978 A1 (KOBOLD SERVICES INC [CA]) 23 February 2017 (2017-02-23)
the whole document
WO 02084067 A1 (NORTHLAND ENERGY CORP [CA]) 24 October 2002 (2002-10-24)
the whole document
Special categories of cited documents:
document defining the general state of the art which is not considered to be of particular relevance
earlier application or patent but published on or after the international filing date
document which may throw doubts on priority claim(s) or which is cited to establish the publication date of another citation or other special reason (as specified)
document referring to an oral disclosure, use, exhibition or other means
document published prior to the international filing date but later than the priority date claimed
later document published after the international filing date or priority date and not in conflict with the application but cited to understand the principle or theory underlying the invention
document of particular relevance; the claimed invention cannot be considered novel or cannot be considered to involve an inventive step when the document is taken alone
document of particular relevance; the claimed invention cannot be considered to involve an inventive step when the document is combined with one or more other such documents, such combination being obvious to a person skilled in the art
document member of the same patent family


Patent document cited in search report Publication date
Patent family member(s) Publication date
US 2015240592 A1
27 August 2015
AU 2011281337 A1
CA 2805955 A1
CA 3018067 A1
CA 3018073 A1
CA 3018079 A1
CN 103097645 A
CN 105156052 A
CN 105178898 A
CN 105178915 A
DK 2596204 T3
DK 2679762 T3
DK 2679764 T3
EA 201370022 A1
EA 201591320 A1
EA 201591321 A1
EA 201591322 A1
EP 2596204 A2
EP 2679762 A1
EP 2679763 A1
EP 2679764 A1
MY 167547 A
SG 187568 A1
SG 10201406536T A
SG 10201406543S A
SG 10201406545T A
SG 10201500692X A
SG 10201500694T A
SG 10201500695S A
US 2013175094 A1
US 2015240592 A1
US 2015240597 A1
US 2015247373 A1
WO 2012010897 A2
07 March 2013
26 January 2012
26 January 2012
26 January 2012
26 January 2012
08 May 2013
16 December 2015
23 December 2015
23 December 2015
06 July 2015
13 June 2016
17 July 2017
28 June 2013
30 November 2015
30 November 2015
31 March 2016
29 May 2013
01 January 2014
01 January 2014
01 January 2014
06 September 2018
28 March 2013
27 November 2014
27 November 2014
27 November 2014
29 April 2015
29 April 2015
29 April 2015
11 July 2013
27 August 2015
27 August 2015
03 September 2015
26 January 2012
WO 2016057014 A1
14 April 2016
AU 2014408248 A1
BR 112017004290 A2
CA 2958816 A1
GB 2545576 A
SG 11201701186P A
US 2017248006 A1
WO 2016057014 A1
16 March 2017
05 December 2017
14 April 2016
21 June 2017
30 March 2017
31 August 2017
14 April 2016
WO 2011067372 A1
09 June 2011
CA 2782748 A1
EP 2507473 A1
US 2012234556 A1
WO 2011067372 A1
09 June 2011
10 October 2012
20 September 2012
09 June 2011
WO 2017027978 A1
23 February 2017
CA 2995420 A1
CN 108474252 A
EA 201890528 A1
US 2018216455 A1
WO 2017027978 A1
23 February 2017
31 August 2018
31 July 2018
02 August 2018
23 February 2017
WO 02084067 A1
24 October 2002
CA 2344627 A1
GB 2381018 A
NO 20025429 A
US 2002170749 A1
WO 02084067 A1
18 October 2002
23 April 2003
13 November 2002
21 November 2002
24 October 2002
Name and mailing address of the ISA/:
European Patent Office
P.B. 5818, Patentlaan 2, 2280 HV Rijswijk,
Telephone No. (+31-70)340-2040
Facsimile No. (+31-70)340-3016
Date of the actual completion of the international search:
03 December 2018
Date of mailing of the international search report:
10 December 2018
Authorized officer:
Patrascu, Bogdan
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