Procedures for leak-off and limit tests (LOT, LT, FIT)

Procedures for leak-off and limit tests (LOT, LT, FIT)

Procedures for leak-off and limit tests. Leak-off and Limit tests are carried out during the drilling phase of the well. The BOP is closed around the drillpipe, and the well is slowly pressured up,…

Casing design factors

This article describes the uniaxial collapse, burst, axial and compression design factors, and the triaxial design factor, recommended for use, together with a brief overview of the considerations…

Basic aspects of rock mechanics

Borehole pressure required to reach tensile failure depends on:

  • tensile strength of the rock;
  • state of stress in the formation;
  • orientation of the wellbore with respect to the state of stress;
  • shape…

Casing Design parameters

Early collection of all the relevant data is essential and it should be done by a multidisciplinary team. Considerable effort is required from the Petroleum Engineering and Operations departments when…

Casing scheme selection

The output of this process is a preliminary well configuration specifying the minimum casing diameter and the minimum casing-shoe setting depth for all strings. This serves as input for the detailed…

Casing design considerations

Casing design considerations

The objective of the casing design is to define a set of casing strings (casing scheme), capable of withstanding a variety of external and internal pressures, thermal loads and loads related to the…

Detailed Design and Analysis

In the detailed design phase, the casing designer determines the material grade and casing wall thickness for each section of the casing scheme selected, which will allow it to withstand all…