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Directional Drilling is Getting Popular Nowadays

3/4 of the Wells Drilled Last Week are not Vertical

Problems Caused by Absence of Directional Casing

  • While Drilling with an Inclination, the Forces on Different Side of the Wellbore are Different Due to the Depth Diefferent
  • The Well Bore is not Perpendicular to Ground, so the Cuttings are more likely to Settle at One Side of the Wellbore
  • If no Directional Casing is Applied to Wellbore, Problem such as Lost Circulation and Wellbore Instability will Occur

Definition of Directional Drilling

Directional Drilling

Directional drilling is the science of deviating a well bore along a planned path to a target located a given lateral distance and direction from vertical.

Reasons We Use Casing

Casing is an important assembly in drilling engineering which is fixed by cementing. There are different kinds of casing acting different role while drilling.

Conductor Pipe - prevent from caving in

aquafer

Surface casing - protect aquifer

Adventages with Rotary Steerable System

Intermediate casing - prevent blowout

Production casing - help produce oil efficiently

  • Constant casing rotation breaks static friction which create even WOB
  • Facilitates borehole cleaning by moving drill cuttings into flowstream
  • Directional and inclination control is much easier with a rotary steerable system (RSS) which resulting in smoother borehole trajectory

1. What is Directional Drilling?

2. Why We Use Casing?

Directional Casing Technology

While Drilling

3. What are the Problems of Conventional Casing While Directional Drilling?

4. What Tools and Methods can be Used to Solve the Problems?

Method and Tools

Method

Directional Casing while Drilling uses the

Rotary Steerable System (RSS)

Tools

PowerDrive X6 push-the-bit Rotary Steerable System or PowerDrive Xceed point-the-bit Rotary Steerable System

Reference

Schlumberger Service and Products

http://www.slb.com/services/drilling/directional_drilling.aspx?entry=ad_google_dm&gclid=CKmqofmXyLMCFcsWMgod8CQA_A

Directional Casing While Drilling

http://www.slb.com/services/drilling/specialty_drilling_applications/casing_drilling/directional_casing.aspx

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