American Oil and Gas Reporter - April 2019 - 68

SpecialReport: Drilling Technology
FIGURE 2
600

Volume bbl

550

500

450

400
0

1

2

3

4

5
Time

6

7

8

9

10

Fingerprinting is a graphical tracking of fluid losses into the formation that makes it possible
to recognize if a well is ballooning or kicking.

water hose-was returning. Noting the return flow, the driller called the operations
supervisor, who decided the well was

Grooved Check Valve

Grooved
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d End
E d
Protection Clamp

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Reducing
d i Tee
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merely ballooning and directed the driller
to continue tripping. Over the course of
tripping another 50 stands, 220 barrels

were pumped from the trip tank into the
main mud tanks, with all the volume
originating from the well. After conferring
with engineering, both the engineer and
the operations supervisor concluded that
the well was only ballooning. The driller
tripped another five stands and performed
a flow check.
At that point, the well was beginning
to flow more heavily and the driller shut
the well in to the protests of the operations
supervisor. After a conference among the
operator and contractor's upper management, the decision was made to trip back
to the top of the kill slug and circulate a
"bottoms up."
The crew members, who did not understand how to interpret the minor shutin pressures, tripped back to the kickoff
point and began circulating through the
flowline (note that they did not strip
back). A gas bubble had migrated into
the well's vertical portion and was being
circulated up the wellbore in diesel-based
mud. When the gas surfaced, it broke out
of solution, and blew the flowline off the
blowout preventer, sending portions of
flowline 40 yards across the location.

Grooved Lever Clamp

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Hobbs, New Mexico 88240

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68 THE AMERICAN OIL & GAS REPORTER

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American Oil and Gas Reporter - April 2019

Table of Contents for the Digital Edition of American Oil and Gas Reporter - April 2019

Contents
American Oil and Gas Reporter - April 2019 - Intro
American Oil and Gas Reporter - April 2019 - 1
American Oil and Gas Reporter - April 2019 - 2
American Oil and Gas Reporter - April 2019 - Contents
American Oil and Gas Reporter - April 2019 - 4
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https://www.nxtbook.com/nxtbooks/aogr/202501
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