Well Types

Exploration – Wild Cat

Delineation

Appraisal

Development

Injectors

Well Designs

Conventional Design – Telescopic

Complex Design – Manobore

Hole Sections:

Different phases:

Surface Hole

Intermediate holes

Production hole drilling phase

Riser

Drive Pipe

Conductor Casing

Surface Casing

Intermediate Casings

Protective Casings

Production Casing

Tubing

Liners and Tiebacks

 Well Type

Typical Well Design

Designs of Wells

Vertical/Near Vertical

Directional Wells

Horizontal Wells

Extended Reach Wells

Multilateral Wells

 

Main Components of a Drilling Rig

Hoisting Component

Rotating

Circulating Component

Power and Prime Movers

Well Control Component

Well Control Equipments:

Wellhead

Casing Spool

Drilling Spool

Spacer Spool

Blowout Preventers (BOP)

Valves

Accumulators

Choke and Kill Lines

Choke and Kill Manifolds

 

Drillstring Sections:

Different Components:

Kelly

Upper and Lower Kelly Cocks

Drill Pipe (DP)

Heavy Weight or Heavy Wall Drill Pipe (HWDP)

Drill Collar

Subs

Downhole Drilling Tools

Reamers

Stabilizers

Downhole Motor

Drilling Jar

Accelerators

Measurement While Drilling Tools (MWD)

Logging While Drilling Tools (LWD)

Pressure While Drilling Tools (PWD)

Seismic While Drilling Tools. (SWD)

Bit:

Types of Bits

Roller Cone

Fixed Cutter Bit

Tubulars:

Drill pipe (DP), Heavy weight drillpipe (HWDP), drill collar (DC), casing (csg) and tubing (tbg) described the following data:

  1. Outside diameter (OD)
  2. Weight of pipe (pounds/f t, #/ft, ppf)
  3. Grade of the pipe (Combination of letter and number for example: grade K-55). The number represents the yield of the pipe multiplied by 1000 psi)
  4. Length of the pipe (ft, m)

Completions Types

Open-hole completions

Cased hole completion

Monobore Completions

Multi-Lateral Completions

Intelligent Completions

Artificial Lift systems

 

Terms:

Annulus:

The space between hole (wellbore, casing) and the outside the pipe (drillpipe, casing, tubing etc). Drilling fluid is pumped through the drillpipe and then up the annulus.

TOC:

Top of the cement in the annulus.

TOL:

Top of liner.

Casing Seat:

It is the setting depth of the casing or end of the casing where it is cemented in a particular phase. It is also referred as casing shoe depth.

BHA:

Abbreviation for Bottom Hole Assembly. The part of the drill string from bottom of the DP (which is top of the DC) to the bit. Generally includes bit; subs, stabilizers,

reamers, other downhole tools and all drill collars. Can also include Heavy Weight drillpipe.

Formation:

Various kinds of rock with different or same mineralogy that the well will be drilling.

MD and TVD

Measured depth along the well and TVD is the true vertical depth of the well.

 

Formation Pressures

Abnormal pressure                 > 0.465 psi/ft

Normal pressure                     = 0.465 psi/ft

Sub-normal pressure               < 0.465 psi/ft

OTHER REFERENCES

More details can be obtained from Drilling Calculations501 Solved Problems for Drilling Operations.

SEE ALSO

Glossary of Drilling Operations

The Oil Drilling (Video)

Conversion Factors

The Mud Lag Time (Video)

General Terms

Gel Strength

Mud Weight

Formation Pressures

Well Control Calculations

The General Calculations(Video)

EXTERNAL LINKS 

RSS

The Halliburton RSS Point the Bit System (Video)

The Baker Hughes RSS Push the Bit System (Video)

The Weatherford RSS (Video)

The Schlumberger RSS Push the Bit System (Video)

The Gyrodata RSS (Video)

Mud Motor

The Dyna-Drill Motor (Video)

The Jaguar Mud Motor System (Video)

The Baker Hughes Navi-Drill (Video)

The Mud Motor Basic Function (Video)

The Hunting Mud Motors (Video)