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International application No. Applicant's or agent's file reference
PCT/US2020/053740 IS19.0859-WO-PCT
International filing date (day/month/year) (Earliest) Priority Date (day/month/year)
01 October 2020 01 October 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.
6. Drawings
The figure of the drawings to be published with the abstract is Figure No.     3C    
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 49/08 (2006.01)i; E21B 43/12 (2006.01)i; E21B 33/12 (2006.01)i; E21B 23/06 (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: sampling fluid, wellbore, fluid tester, fluid mixture, at least two phases, hydrocarbon-based phase, water-based phases, isolate, separate, pump, test


Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No.
US 2011-0198078 A1 (HARRIGAN et al.) 18 August 2011 paragraphs [0002]-[0139]; and figures 1-11
US 2004-0087448 A1 (SMITH et al.) 06 May 2004 paragraphs [0002]-[0064]; and figures 1-5
US 2008-0105032 A1 (REDDY et al.) 08 May 2008 abstract; claims 14-25; and figures 1-5
WO 2017-040457 A2 (WEATHERFORD TECHNOLOGY HOLDINGS, LLC.) 09 March 2017 paragraphs [0001]-[0043]; and figure 1
US 2011-0163017 A1 (JOHNSON, RAYMOND FORD) 07 July 2011 paragraphs [0003]-[0032]; and figures 1-7
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 2011-0198078 A1
18 August 2011
CA 2730532 A1
CA 2730532 C
EP 2313610 A2
EP 2313610 B1
MX 2011000484 A
US 8794318 B2
WO 2010-008994 A2
WO 2010-008994 A3
21 January 2010
20 December 2016
27 April 2011
17 October 2012
22 February 2011
05 August 2014
21 January 2010
15 April 2010
US 2004-0087448 A1
06 May 2004
CA 2447306 A1
CA 2447306 C
US 7219735 B2
01 May 2004
12 May 2009
22 May 2007
US 2008-0105032 A1
08 May 2008
CA 2667523 A1
CA 2667523 C
CN 101680862 A
EP 2084525 A2
EP 2084525 B1
JP 4981142 B2
JP 2010-508517 A
US 7805979 B2
WO 2008-051900 A2
WO 2008-051900 A3
02 May 2008
30 April 2013
24 March 2010
05 August 2009
28 April 2010
18 July 2012
18 March 2010
05 October 2010
02 May 2008
19 June 2008
WO 2017-040457 A2
09 March 2017
WO 2017-040457 A3
28 September 2017
US 2011-0163017 A1
07 July 2011
CA 2553865 A1
EP 1708800 A2
US 2005-0167346 A1
US 2005-0170492 A1
US 2005-0178905 A1
US 2008-0116145 A1
US 2008-0156709 A1
US 2008-0272065 A1
US 2009-0045126 A1
US 2009-0120461 A1
US 2009-0045127 A1
US 2012-0228220 A1
US 7291267 B2
US 7459091 B2
US 7459092 B2
US 7906023 B2
US 8012355 B2
US 8419935 B2
US 8557116 B2
US 8591739 B2
US 8882997 B2
WO 2005-074508 A2
WO 2005-074508 A3
WO 2005-084189 A2
WO 2005-084189 A3
18 August 2005
11 October 2006
04 August 2005
04 August 2005
18 August 2005
22 May 2008
03 July 2008
06 November 2008
19 February 2009
14 May 2009
19 February 2009
13 September 2012
06 November 2007
02 December 2008
02 December 2008
15 March 2011
06 September 2011
16 April 2013
15 October 2013
26 November 2013
11 November 2014
18 August 2005
18 May 2006
15 September 2005
12 October 2006
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:
18 January 2021
Date of mailing of the international search report:
20 January 2021
Authorized officer:
BAHNG, Seung Hoon
Telephone No. +82-42-481-5560
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