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International application No. Applicant's or agent's file reference
PCT/US2019/054078 140846-081401WO
International filing date (day/month/year) (Earliest) Priority Date (day/month/year)
01 October 2019 30 September 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 filed or furnished:
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.
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 21/06 (2006.01)i; E21B 21/00 (2006.01)i; C09K 8/42 (2006.01)i; C09K 8/035 (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:
Korean utility models and applications for utility models
Japanese utility models and applications for utility models
Electronic data base consulted during the international search (name of data base and, where practicable, search terms used):
eKOMPASS(KIPO internal) & keywords: drilling, treatment fluid, polyvalent cation reaction polymer, polyvalent cation source, delay, capsule, breaker, reclaim


Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No.
US 2008-0190609 A1 (ROBB et al.) 14 August 2008 paragraphs [0002], [0006], [0021], [0025], [0032]-[0037], [0057]-[0067]
US 2015-0000912 A1 (HALLIBURTON ENERGY SERVICES, INC.) 01 January 2015 paragraph [0084]
US 2019-0031941 A1 (HALLIBURTON ENERGY SERVICES, INC.) 31 January 2019 paragraph [0010]
US 2016-0264842 A1 (HALLIBURTON ENERGY SERVICES, INC.) 15 September 2016 paragraph [0042]
US 6444316 B1 (REDDY et al.) 03 September 2002 claim 1
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
US 2008-0190609 A1
14 August 2008
AU 2008-212689 A1
AU 2008-212689 B2
BR PI0806243 A2
BR PI0806243 B1
CA 2676296 A1
CA 2676296 C
CN 101617017 A
EP 2118234 A1
MY 148869 A
US 7584791 B2
WO 2008-096165 A1
14 August 2008
14 June 2012
06 September 2011
27 March 2018
14 August 2008
17 January 2012
30 December 2009
18 November 2009
14 June 2013
08 September 2009
14 August 2008
US 2015-0000912 A1
01 January 2015
BR 112015028935 A2
GB 2530187 A
GB 2530187 B
MX 2015015739 A
RO 131132 A2
US 9657552 B2
WO 2014-209446 A1
25 July 2017
16 March 2016
22 March 2017
16 March 2016
30 May 2016
23 May 2017
31 December 2014
US 2019-0031941 A1
31 January 2019
AU 2016-403497 A1
GB 2564274 A
US 10570328 B2
WO 2017-184111 A1
30 August 2018
09 January 2019
25 February 2020
26 October 2017
US 2016-0264842 A1
15 September 2016
AR 099564 A1
AU 2014-384680 A1
AU 2014-384680 B2
CA 2938625 A1
CA 2938625 C
GB 2537078 A
NO 20161268 A1
WO 2015-130278 A1
03 August 2016
25 August 2016
23 March 2017
03 September 2015
08 January 2019
05 October 2016
05 August 2016
03 September 2015
US 6444316 B1
03 September 2002
CA 2346341 A1
CA 2346341 C
EP 1166866 A2
EP 1166866 A3
EP 1166866 B1
NO 20012199 A
NO 325670 B1
US 6527051 B1
US 6554071 B1
05 November 2001
08 September 2009
02 January 2002
16 October 2002
17 September 2008
06 November 2001
07 July 2008
04 March 2003
29 April 2003
Name and mailing address of the ISA/:
Korean Intellectual Property Office
189 Cheongsa-ro, Seo-gu, Daejeon Metropolitan City, 302-701
Republic of Korea
Facsimile No. +82-42-481-8578
Date of the actual completion of the international search:
26 June 2020
Date of mailing of the international search report:
26 June 2020
Authorized officer:
BAHNG, Seung Hoon
Telephone No. +82-42-481-5560
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