Casing

1
Casing

• 22.1-1

2
Expandable Tubulars
3
Expandable Tubulars
4
Expandable Tubulars
5
Expandable Tubulars
6
Expandable Tubulars
7
Expandable Tubulars
8
Expandable Tubulars
9
Expandable Tubulars
10
Casing Drilling
In the casing drilling process, the well is
drilled and cased simultaneously, using standard
oilfield casing. The bottomhole assembly (BHA) is
latched into the bottom joint of casing and is
run and retrieved through the casing, via
wireline. Using wireline to convey the BHA is
much faster than conventional tripping with a
drill string. For directional or horizontal
wells, the BHA can be fitted with conventional
directional equipment, such as mud motors and
measurement-while-drilling (MWD) tools. Since
these tools are run and retrieved inside casing,
they are protected from the harsh downhole
environment while in transit.
11
South Texas Casing Drilling Rig
12
Casing Drilling Utilizes the Casing Itself as the
Drillstring. When casing depth has been
reached the drilling assembly is removed by
wireline, and the casing is cemented in place.
13
Benefits

• For operators it
• Reduces drilling time and lowers costs
• Improves wellsite safety and well control
• Reduces unscheduled events
• Provides a quicker return on investment
• Lessens environmental impact

14
Benefits

• For Drilling Contractors
• Eliminates the need for drillpipe and drill
  collars
• Eliminates the need for double and triple masts
  and heavy setback areas
• Makes rig moves easier
• Reduces labor requirements
• Reduces fuel consumption and wear on equipment
• Lessens the chance of pipe-handling incidents
• Lowers capital requirements.

15
Benefits

• For service companies
• Opens up a new service market
• Provides an additional application for existing
  tools and an opportunity to develop new tools to
  gain market share
• Extends tool life by protectiong tools during
  running and retrieval
• Reduces time and risk in recovering from downhole
  tool failure.