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Directional Drilling
Drillstring mechanics
Relief Well
Wellbore Placement
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Drillabity result from BHA Management Drillabity result from BHA Management

Case Studies > Directional Drilling

Steerable Motor

Problem
Important sliding at low ROP and poor hole quality (reaming required) was observed in a 17"1/2 Steerable Motor BHA in kickoff & slant section. In addition, the operator's aim was to perform kick off & slant section with the same BHA.
Analysis
The post-analysis of previous runs made it possible to fit a correct hole overgauge for each bent used with a high level of predictability.
Solution
The sensitivity analysis performed showed that the bent could be reduced from 1.50° to 1.15° and the addition of a string stabilizer behind the motor allowed the operator to perform kick off & slant section with the same BHA.
Benefits
  • Shoe to shoe one BHA strategy
  • Sliding/Rotating ratio improved
  • Economical benefits of a one day trip in/trip out reduction


Rotary Steerable System

Problem
Inability to build in loose sands with a 9"1/2 point-the-bit RSS resulting in drain mispositioning.
Analysis
Caliper showed an important hole overgauge and post-analysis enabled to fit formation hardness. Our calculations clearly showed that the system was losing its pilotability with overgauge.
Solution
Using measured overgauges and fitted formation hardness, the BHA and bit design showed that increasing second stabilizer diameter and decreasing bit steerability (optimizing the passive gauge length) had a major influence on RSS and bit response.
Benefits
  • Correct drain positioning
  • No more wire trip
  • All reservoir is reached