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Upstream Oil & Gas
In collaboration with Devon Canada (now CNRL), we developed a tool to quantitatively risk-rank SAGD wells for subsurface barrier integrity based on identified damage mechanisms and associated, readily available influential attributes or proxy attributes.
Such a tool can aid significantly in identifying wells at a higher risk of casing and cement sheath damage or failure; the specific mechanism and barrier at risk; the associated diagnostic, mitigation steps and resources to deploy to achieve...
Flow control devices are used in SAGD wells to balance the oil inflow along horizontal wells and mitigate unwanted fluid breakthrough.
The newest generation of flow control devices for SAGD wells, Autonomous Inflow Control Valves (AICVs), can:
- optimize oil production;
- reduce SOR; and
- significantly restrict the inflow of unwanted fluids.
To assess the performance of AICVs, we conducted testing in a full-scale high temperature laboratory flow loop that replicates SAGD production conditions....
As part of a Joint Industry Project focused on studying FCDs for SAGD operations, a new device was investigated that inhibits the influx of steam while allowing the flow of emulsion into a production well. This new device was tested in C-FER’s lab using a high temperature, multiphase FCD flow loop and a three-phase FCD erosion loop, and in the field at Cenovus and Suncor sites. Details of the test program and the performance results of the new FCD device are presented in a paper co-authored by...
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...
As part of a Joint Industry Project focused on optimizing FCD design and selection, fiber-optic based instrumentation was deployed in FCD-equipped SAGD producer wells to collect distributed temperature and acoustic sensing data to better understand the fluid inflow distribution.
In addition, acoustic instrumentation was installed in parallel with a high temperature, multiphase flow loop located at C-FER to try and better understand the correlation between an FCD’s operating condition and its...
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...