This document discusses well completion testing and work over. It defines well completion as preparing a well for production by installing necessary equipment to allow safe and controlled hydrocarbon flow to the surface. The document describes open hole and cased hole well completions, including their advantages and disadvantages. It also discusses different types of well completions like liner completions, perforated liner completions, and production casing completions. Finally, it briefly covers different flow configurations like casing flow, tubing and annulus flow, and tubing flow.
1. PE6603 WELL COMPLETION TESTING AND WORK OVER
Lecture by
Velmurugan senthooran.Er
B.Tech, FAFS,M.S Research in china, M.B.A at UOP
DEPARTMENT OF PETROLEUM ENGINEERING
DHANALAKSHMI SRINIVASAN INSTITUTE OF RESEARCH AND TECHNOLOGY
2. ๏ผIntroduction to well completion
๏ผGeneral Procedure of well completion
๏ผOpen hole well completion
๏ผCased hole well completion
3. Informal definition:
The high time of the well when engineer and
personnel comes to decide whether to install the
production casing in order to initiate the production at
the surface or it should be abandoned .
Technical Definition:
Well completion means to prepare the well for
production by installing the necessary
equipments into the well in order to allow the safe
and controlled flow of HCS at the surface.
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10. ๏งIn an open hole well completion the production casing is
just set above the pay zone, while the entire deepen bottom
of pay zone is left uncased.
OPEN HOLE WELL COMPLETION:
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12. โขMaximum exposure of pay zone
โขLess pressure drawdown during flow
โขNo formation damage occurs due to cementing
and perforation.
โขLess formation damage
13. โขInability to plug off water or gas zones
โขInability to stimulate the separate zones within the
productive zones
14. โขFor the most common type of well completion today
involves the cased hole completion, in which the
production casing and liner are cemented and
perforated subsequently.
15. โขSelect the sections of the pay zone we wish to produce
โขStimulate the separate pay zone from the well
โขMultiple completion zones
16. โขA Liner is installed across the pay zone
โขIt can be divided into two: Screen Liner and perforated
liner
โขScreen Liner : Casing is set above the producing zone and
an uncemented screen and liner assembly is installed
across the pay zone
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18. โขCasing is set above the producing
zone and a liner assembly is installed
across the pay zone and cemented
in place. The liner is then perforated
selectively for production.
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20. โขProduction casing is cemented through the
producing zone and pay section is selectively
perforated
24. โขCasing flow: large flow rate no tubing is required, used in middle
east.
โขTubing andAnnulus flow: large flow rate flow segregation.
โขTubing flow: Used widely in Malaysia due to safety, may use one
more tubing strings.
25. โขSimplest way of completing the well
โขIn this method well is completed by single zone with single
tubing
26. โขIn this multiple branches are drilled from a single zone
โขIt is used to improve productivity from closely spaced target zones.