Well Integrity

Casing collapse can occur when external pressure or load exceeds the collapse resistance of the casing.  

Factors that can influence the collapse resistance of the casing include:

  • Pipe ovality – the initial ovality of the pipe from the manufacturing process or due to damage during installation such as bending, or crushing, can reduce the collapse resistance
  • Axial loading – loads induced in the casing during operation due to temperature changes, subsidence and improper pre-tensioning can affect...

When a casing or tubing string is subjected to axial compression it may form a buckle that can impair well access due to increased local well curvatures.

The amplitude (amount of curvature) and shape of the buckle depends on:

  • the amount of compression and;
  • how much lateral constraint is provided by the well cement and surrounding formations.

If there is no lateral constraint, a global buckle (also called an Euler buckle) can occur that has the appearance of a gradual bow in the casing in one...

Movement along fault zones and slip planes may cause significant shear deformations of wellbores that appear as lateral displacement of the pipe. These often form an “S” shape with two distinct bends in opposite directions.  

Faults may move due to:

  • ongoing tectonic activity
  • changes in the in-situ stresses caused by pore pressure depletion during production operations
  • pore pressure increases that can occur due to well drilling, stimulation or disposal of produced water.

The width of the fault...

Well casing is subjected to a wide variety of loading mechanisms that can cause temporary or permanent deformations. These deformations can be due to geological processes or well operations.  They can impair or prevent access to the full depth of the well or compromise the pressure integrity.  They can occur instantaneously or progress over many years.

Many historical well workover reports have reported casing deformations as “casing collapse” when a tool string cannot pass by a “tight” interval...

In this free webinar, we are going to discuss:

  • Deformations – The “Tight Spot” – what is the “Tight Spot,” Causes and Why diagnosis is important
  • Tubular Deformations: Varieties and Root Causes
  • Using Multi-Finger Caliper Data to Diagnose and Quantify Deformations
  • Deformation Case Histories & Simulations

This webinar  is intended for well integrity, completion and production engineers in oil and gas and cavern storage companies, the staff of logging service companies, and related equipment...

This hands-on course will provide attendees with an overview of wellbore tubular deformation modes. Various wellbore applications (enhanced recovery, thermal, CHOPS and cavern storage) will be reviewed, along with an overview of some of the deformation mechanisms (permafrost thaw, salt creep and formation movement) and impacts on well integrity. Emphasis will be on the use of C-FER’s Multifinger Caliper (“MFC”) analysis software (Well Xplore™) to identify and characterize such deformations.

The...

This course will provide attendees with an overview of the considerations, key factors, industry guidelines and practices, examples, and field experience related to the design and integrity of thermal recovery wells.

The objective of this course is to review the:

  • Thermal well design process, industry regulations and recommended practices (IRPs);
  • Key material properties and damage mechanisms of casing and liner tubular steels, wellbore cements, and formations;
  • Casing and liner design approach...

C-FER Technologies is pleased to announce the release of a new version of Well Xplore Software.

New features of Well Xplore v1.4 include:

  • Import wells, logs, and pads into new and existing Well Xplore files;
  • Nominal ID and OD are now overlain on the cross-section view;
  • Quickly delete a log – no more simultaneous loading while deleting; and
  • Improved SQL database compatibility
    • Solved crash issues when sharing files between systems with different versions of SQL Server

Since the development of the first torque and drag models used to predict rig hook loads in the early 1980s, drilling and completion engineers have relied on various forms of proprietary and commercial software to:

  • optimize well trajectory and tubular designs;
  • prevent buckling and lockup; and
  • understand the installation load profiles for critical string components.

Longer laterals, advanced completion tools, and complex well trajectories demand a more flexible and rigorous torque and drag...

Abstract

Horizontal wells have been widely used to significantly increase reservoir exposure in a wide range of conventional and unconventional oil and gas recovery applications, including tight-rock and multi-stage fracturing, offshore, primary and thermal heavy oil projects. In the heavy oil and bitumen reservoirs of the Western Canadian basin, horizontal wells have been extensively employed in Steam Assisted Gravity Drainage (SAGD) and Cyclic Steam Stimulation (CSS) in-situ recovery projects....