PerfClean

 Tool View from Bottom

·    Four patents issued to date 

·    Treated over 4,000 wells in 12 states        

    and 7 international areas 

·    More than 900 wells have been treated for OXY Permian 

 

Definitions

Fluidic: of, relating to, or being a device (as an amplifier or control) that depends for operation on the pressures and flows of a fluid in precisely shaped channels

 

Acoustic Streaming: the production of unidirectional flow currents in a fluid because of the presence of sound waves

 

Synergism: an interaction of elements such that their combined effect is greater than the sum of their individual effects.

 

Well Stimulation

 

Completions and Workovers

 

Whether,

              New

              Old

              Vertical

              Horizontal

              Cased

              Open hole

              Perforations

              Gravel Packs

              Slotted liners

 

PerfClean

 

·     Fluidic oscillator based on the Coanda Effect 

·     It is a "positive " displacement oscillator 

·     No moving parts 

·     Does not rely on cavitation 

·     Utilizes the kinetic energy of the pumped fluid

 

   

Purpose

 

To treat and correct near wellbore damage of all types 

·      Mud & cement damage 

·      Mechanical damage from drilling 

·      Damage from perforating 

·      Scale deposition 

·      Paraffins and asphaltenes 

·      Water Blocks 

·      Gas Blocks 

·      Acid sludges 

·      Emulsions 

·      Clean out fill

 

 

How does PerfClean work?

 

·       The treatment fluid enters the switch body and is accelerated into the fluidic oscillator. 

·       The fluid stream enters the oscillator and preferentially attaches to the outer wall of one of the fluid passageways. 

·       The flow continues down the selected passageway to the outlet. 

·       As the flow passes a cross channel, a low pressure area is created which causes the main fluid stream to be interrupted and the flow to switch and attach to the other fluid passageway. 

·       The switch begins to oscillate which causes alternating “bursts” of fluid to be ejected into the wellbore. 

·       As each “burst” is ejected, it forms a compression wave within the wellbore fluid. 

·       Compressive loading occurs when the wave enters the perforation tunnel and contacts the formation face. 

·       As the wave passes through the formation and is reflected back, it induces a tensional loading on the skin damage. 

·      The continuous cycling of these pressure waves causes the skin damage to reach its fatigue failure point.

 

 

Cleaning Mechanisms

 

 1.        Cyclic Loading     

·     Stress loading caused by the oscillating pressure waves as the tools are reciprocated through the interval   

2.        Acoustic Streaming 

·         "Pinpoint" placement of fluid  

3.         Chemical reaction  

·      Enhances the reaction through increased fluid mixing and by increasing the surface area  for contact 

 

Types of fluids used

 

·     Water

·     Acid

·     Diesel

·     CO2

·     N2

·     Foamed fluids

 

The fluid that is pumped is an integral part of the treatment

 

The type of fluid is determined by the nature of the problem

 

Ideal Fluid Properties

 

·      Surface tension reduction

·      Friction reduction

·      Surfactant activity

·      Penetration capability

·      Solids suspending

·      Wettability protection

·      Acid retardation

·      Increased solubility