Motivation

The idea of SBT is to 

Objectives

Assess formation pressure in perforated formation units. 

Data Acquisition Procedure

• Differential pressure gauge 
  
  
• Permanent Flowmeter

Data Interpretation

Assumptions and Limitations

The survey assumes that

• the achieved shut-in conditions are representative of the formation pressure
  
  
• the fluid column across the surveyed interval stays the same all the way down to the formation datum
  
  

The survey is applicable for wells with one perforated unit with no integrity issues (behind casing communications, active leaks or leaky bottom-hole)

The survey is applicable for wells with multiple perforations providing that all perforated units have the same formation pressure so that well doe snot develop a cross-flow between perfoations during the survey.

In most practical cases the above conditions are not met and SGS maybe highly misleading.