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Computational Fluid Dynamics
Report Summary
A CFD comparison of two types of
tubing anchor catchers
The Comparison
The Study
A comparison CFD analysis of the
fluid flow within the annular space
around two types of a 5.5” tubing
anchor catchers (TACs) to assess the
differences between them in terms
of flow parameters.
Prepared by:
Slimline® TAC Standard TAC
Common Downhole Problems that Decrease
Production and Increase Costs
• Rod pump gas locking
• Tubing that is not anchored in deep and/or deviated wells
• Inability to stimulate perforations effectively to maintain production
• Standard tubing anchors that restrict annular flow in the casing
• The anchor’s design can be restrictive because of its large diameter
• Annular flow around the standard anchor is turbulent vs. more laminar
• Annular flow vorticity around the standard anchor is high
• Pressure drop around the standard anchor is high
• Plugging agents that build up and restrict flow in the casing due to
the flow regime around a standard anchor
• Scale, iron sulfide, and paraffin
How Does the TechTAC® Slimline® Anchor
Solve These Common Problems?
• The overall diameter and design of the Slimline® vs. a standard anchor is optimized
• Increased flow area in the annular space between the anchor and the ID of the casing
• Reduces the back-pressure around the anchor allowing for improved gas flow to the surface, reducing or
eliminating rod pump gas locking
• Less pressure drop and turbulent flow greatly reduces the precipitation of scale, iron sulfide, and paraffin
• Ability to stimulate perforations effectively because fluid rates can be maximized
• The mechanical geometry of the Slimline® provides advantages over a standard anchor
• The alignment of the carbide pads and guide blocks* with the drag springs optimizes the flow field
• Reduces velocity around the anchor thereby reducing erosion/corrosion
• The Slimline® QuickSet™ TAC fully sets in 1-3 turns, allowing it to be set in deep and
deviated wells
• The tubing string doesn’t just “torque-up;” 1-3 turns get to the anchor
*5.5-inch Slimline®
CFD Modeling: Velocity
Lower velocities will reduce the erosional/corrosive effect on the anchor and
the casing wall
Standard Anchor Slimline® Anchor
“The presence of carbide pads
between the drag springs and the
downstream localized pressure
drop form noticeable obstacles in
front of the flow field, which
cause higher velocity spots.”
“Such obstacles are significantly
reduced in the Slimline’s case in
which localized pressure drop is
present and the pads are aligned
with the drag springs, which
results in a more uniformly
distributed velocity field.”
CFD Modeling: Pressure Drop
Pressure drop is the primary issue causing gas locking in rod pumps and a
major contributor in the formation of scale, iron sulfide, and paraffin
Standard Anchor Slimline® Anchor
“The pressure drop is more than
double the drop along the
Slimline®. A noticeable drop
prior to the downstream
connection is [also] observed.”
“The annular cavity is wider with
the Slimline® case than that for
the standard anchor, and the
pressure drop change in the
Slimline® case is less abrupt.”
CFD Modeling: Turbulence
Turbulence is a major contributor in the formation of scale, iron sulfide, and
paraffin, and plays a role in the advent of gas locking
Standard Anchor Slimline® Anchor
“The abrupt changes in the pressure
field along with the potential
presence of the flow field obstacles in
the case of the standard anchor
generates more turbulence within the
flow field along the anchor.”
“The turbulent kinetic energy is
greatly reduced along the
Slimline® design.”
CFD Modeling: Vorticity
Vorticity is another contributor in the formation of scale, iron sulfide, and paraffin, as well as
the presence of gas locking and casing erosion/corrosion. In addition, reduced vorticity can
optimize annular stimulation.
Standard Anchor Slimline® Anchor
“The vorticity strength in the flow
field of the standard anchor is
significantly present.”
“The vorticity field strength is
0.005.”
Report Summary
• Downhole restrictions and back-pressure can greatly reduce production
• Mechanical anchor design can affect costs and completion design, ultimately effecting recoveries
• Computational fluid dynamics accurately describes the benefits of the Slimline® TAC over a standard TAC
• The pressure drop along the standard TAC is more than double that of the Slimline®, because the
Slimline’s design creates a wider annular cavity
• The geometry of the Slimline® provides a noticeable advantage over the standard TAC in reducing the
overall turbulence and vorticity strengths within the flow field; in addition, the reduced velocity provides
for a reduction in the erosional and corrosive effects on the anchor and the casing
• The reduction in turbulence and vorticity with the Slimline® is extreme when considering high gas rates
• Installing the Slimline® TAC versus a standard TAC will reduce workover costs, increase production rates
and ultimate recoveries, and provide for optimized completion designs
TechTAC® CFD Report Summary: A Comparison of Two Types of Tubing Anchor Catchers

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TechTAC® CFD Report Summary: A Comparison of Two Types of Tubing Anchor Catchers

  • 1. Computational Fluid Dynamics Report Summary A CFD comparison of two types of tubing anchor catchers
  • 2. The Comparison The Study A comparison CFD analysis of the fluid flow within the annular space around two types of a 5.5” tubing anchor catchers (TACs) to assess the differences between them in terms of flow parameters. Prepared by: Slimline® TAC Standard TAC
  • 3. Common Downhole Problems that Decrease Production and Increase Costs • Rod pump gas locking • Tubing that is not anchored in deep and/or deviated wells • Inability to stimulate perforations effectively to maintain production • Standard tubing anchors that restrict annular flow in the casing • The anchor’s design can be restrictive because of its large diameter • Annular flow around the standard anchor is turbulent vs. more laminar • Annular flow vorticity around the standard anchor is high • Pressure drop around the standard anchor is high • Plugging agents that build up and restrict flow in the casing due to the flow regime around a standard anchor • Scale, iron sulfide, and paraffin
  • 4. How Does the TechTAC® Slimline® Anchor Solve These Common Problems? • The overall diameter and design of the Slimline® vs. a standard anchor is optimized • Increased flow area in the annular space between the anchor and the ID of the casing • Reduces the back-pressure around the anchor allowing for improved gas flow to the surface, reducing or eliminating rod pump gas locking • Less pressure drop and turbulent flow greatly reduces the precipitation of scale, iron sulfide, and paraffin • Ability to stimulate perforations effectively because fluid rates can be maximized • The mechanical geometry of the Slimline® provides advantages over a standard anchor • The alignment of the carbide pads and guide blocks* with the drag springs optimizes the flow field • Reduces velocity around the anchor thereby reducing erosion/corrosion • The Slimline® QuickSet™ TAC fully sets in 1-3 turns, allowing it to be set in deep and deviated wells • The tubing string doesn’t just “torque-up;” 1-3 turns get to the anchor *5.5-inch Slimline®
  • 5. CFD Modeling: Velocity Lower velocities will reduce the erosional/corrosive effect on the anchor and the casing wall Standard Anchor Slimline® Anchor “The presence of carbide pads between the drag springs and the downstream localized pressure drop form noticeable obstacles in front of the flow field, which cause higher velocity spots.” “Such obstacles are significantly reduced in the Slimline’s case in which localized pressure drop is present and the pads are aligned with the drag springs, which results in a more uniformly distributed velocity field.”
  • 6. CFD Modeling: Pressure Drop Pressure drop is the primary issue causing gas locking in rod pumps and a major contributor in the formation of scale, iron sulfide, and paraffin Standard Anchor Slimline® Anchor “The pressure drop is more than double the drop along the Slimline®. A noticeable drop prior to the downstream connection is [also] observed.” “The annular cavity is wider with the Slimline® case than that for the standard anchor, and the pressure drop change in the Slimline® case is less abrupt.”
  • 7. CFD Modeling: Turbulence Turbulence is a major contributor in the formation of scale, iron sulfide, and paraffin, and plays a role in the advent of gas locking Standard Anchor Slimline® Anchor “The abrupt changes in the pressure field along with the potential presence of the flow field obstacles in the case of the standard anchor generates more turbulence within the flow field along the anchor.” “The turbulent kinetic energy is greatly reduced along the Slimline® design.”
  • 8. CFD Modeling: Vorticity Vorticity is another contributor in the formation of scale, iron sulfide, and paraffin, as well as the presence of gas locking and casing erosion/corrosion. In addition, reduced vorticity can optimize annular stimulation. Standard Anchor Slimline® Anchor “The vorticity strength in the flow field of the standard anchor is significantly present.” “The vorticity field strength is 0.005.”
  • 9. Report Summary • Downhole restrictions and back-pressure can greatly reduce production • Mechanical anchor design can affect costs and completion design, ultimately effecting recoveries • Computational fluid dynamics accurately describes the benefits of the Slimline® TAC over a standard TAC • The pressure drop along the standard TAC is more than double that of the Slimline®, because the Slimline’s design creates a wider annular cavity • The geometry of the Slimline® provides a noticeable advantage over the standard TAC in reducing the overall turbulence and vorticity strengths within the flow field; in addition, the reduced velocity provides for a reduction in the erosional and corrosive effects on the anchor and the casing • The reduction in turbulence and vorticity with the Slimline® is extreme when considering high gas rates • Installing the Slimline® TAC versus a standard TAC will reduce workover costs, increase production rates and ultimate recoveries, and provide for optimized completion designs