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International application No. Applicant's or agent's file reference
PCT/US2020/016786 0004159.751000
International filing date (day/month/year) (Earliest) Priority Date (day/month/year)
05 February 2020 05 February 2019
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.

Systems and methods for sealing a lost circulation zone (22) associated with a subterranean well include a drill string (16) with a circulating port (28) and a lost circulation material (34). A lost circulation shape (32) is a hollow body having an outer skin (36) and an open interior chamber (40). The outer skin includes a plurality of perforations (38) that extend through the outer skin, providing fluid communication between an exterior of the lost circulation shape and the open interior chamber. The plurality of perforations are sized to prohibit a passage of lost circulation material between the exterior of the lost circulation shape and the open interior chamber.

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 21/00 (2006.01)i; C09K 8/516 (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):
     E21B; C09K
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.
WO 2015071787 A1 (SCHLUMBERGER CA LTD [CA]; SCHLUMBERGER TECHNOLOGY CORP [US] ET AL.) 21 May 2015 (2015-05-21)
paragraphs [0019], [0026], [0032], [0050]; figures 1, 2, 6
US 2013068478 A1 (ALLEN JOHN TIMOTHY [SA] ET AL) 21 March 2013 (2013-03-21)
paragraphs [0007], [0024], [0027], [0028]; figures 6, 8A, 9
US 2004238218 A1 (RUNIA DOUWE JOHANNES [NL] ET AL) 02 December 2004 (2004-12-02)
paragraph [0006]
Special categories of cited documents:
document defining the general state of the art which is not considered to be of particular relevance
document cited by the applicant in the international application
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
WO 2015071787 A1
21 May 2015
CN 105637172 A
EA 201690703 A1
EP 3052749 A1
US 2016237767 A1
WO 2015071787 A1
01 June 2016
30 September 2016
10 August 2016
18 August 2016
21 May 2015
US 2013068478 A1
21 March 2013
BR 112014006550 A2
EP 2758624 A2
US 2013068478 A1
US 2016237778 A1
US 2018230771 A1
WO 2013043489 A2
13 June 2017
30 July 2014
21 March 2013
18 August 2016
16 August 2018
28 March 2013
US 2004238218 A1
02 December 2004
BR 0211345 A
CA 2454388 A1
CN 1543531 A
GB 2395735 A
NO 326488 B1
RU 2287662 C2
US 2004238218 A1
WO 03010410 A1
28 September 2004
06 February 2003
03 November 2004
02 June 2004
15 December 2008
20 November 2006
02 December 2004
06 February 2003
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:
26 May 2020
Date of mailing of the international search report:
05 June 2020
Authorized officer:
Jucker, Chava
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