Pressure Pulse Technology: An Innovative Fluid Flow ...It is a quasi-static phenomena. Mega...

Energy and Environmental Services Inc.Advanced Solutions for the Petroleum and Environmental Sectors

Pressure Pulse Technology:

An Innovative Fluid Flow Technique

and Remedial Tool

Tim Spanos, Ph.D. and Brett DavidsonWavefront Energy and Environmental Services Inc.

www.onthewavefront.com Trading Symbol: WEE.TSX.V

§A proven fundamental fluid-flow development.

§A non-seismic wave propagation process in porous media.

§PPT generates porosity dilation waves in porous media.

§The porosity dilation wave is a slow body wave, predicted by theory, and verified in the laboratory and field.

§PPT transmits dynamic (inertial) energy to the pore liquids.

Pressure or Strain Perturbations

original state of the porous media

response of porous media dueto a pressure or strain pulse

relaxation of porous mediaafter pulse has dissipated

Repeating of this process yields a synergetic effect

conceptual conceptual conceptual

Porosity Dilation Wave Mechanics

Compressional Wave, VP

Shear WaveVS ~ 0.6VP

Porosity Dilation Wave

VD ~ 0.05-0.08VP

Type of Body Wave

Why Should You Be Interested in PPT?

PPT has been shown to:

Significantly increase oil production rate, total production, and fluid injectivity. It is estimated that will yield an additional 7.5 billion barrels of oil.

Mobilize ganglia of contaminants.

PPT is unique. It will become the standard for enhanced fluid flow.

Significantly increase pore scale dispersion.

1012141618

0 1 2 3 4 5

Time (s)

Pressure Pulse Waves –The Heart and Wavefront Tooling

Stroke Volume = volume pumped/beat

Stroke Volume = volume affected/down stoke

Cardiac Output = stroke volume x heart rate

Total Output = stroke volume x stroke frequency

Vessel diameter critical to flow

Pore diameter critical to flow

With each beat of the heart:•diastole - relaxation, recharge•systole - contraction, discharge

With each PPT cycle:•diastole - up stoke of piston, cylinder recharge•systole - down stoke of piston, fluid expulsion

Scales of InteractionMolecular (Micro) Scale - Diffusion

Diffusion is mixing at the molecular-scale and involves chemical reactions. It is independent of fluid flow.

Involves mechanical mixing at the pore scale. It is dispersion and is greatly enhanced by PPT.

Macro (Pore) Scale - Mixing

“Fingering or viscous fingering” describes mega scale mixing. It is a quasi-static phenomena.

Mega (1000’s of Pores) Scale - Mixing

Properties of Porous Media

The mobility of fluids in porous media is a function of interconnected pore scale pathways.

Rebound or contaminant persistence is related to poor mixing at the pore scale or the inability of fluids to flow in the mainstream.

All porous media is heterogeneousat all scales.

Parameters Effecting Fluid Flow

Porosity Permeability

Pulse FrequencyPore throat diameter

Phase saturations Viscosity of fluids

Interfacial tension Wettability

Environment – The Problem

• Natural flow processes inhibit the recovery of contaminants and the uniform distribution of injected remedial amendments.

A Tool to Address the Problem

The Adventures of Peter Pulser

Pressure Pulse Technology

Developed to increase ultimate oil recovery, accelerate contaminant extraction, and improve the distribution of in-situ treatment remedies for groundwater contaminants.

The bottom line in the ground….PPT results in greater contact and distribution of injected liquids, and the accelerated recovery of fluids.

What is to Gain in Using PPT?

1. Mixing and dispersion of amendments (biotic, or abiotic) at the pore scale.

2. Ability to increase radius of influence hence reducing the number of injection points.

3. Ability to influence distribution of remedial fluids in heterogeneous formations.

4. Ability to reach sensitive or difficult locations.

5. Ability to mobilize trapped ganglia. Optimizing pump-and-treat programs.

Pressure Injection Pressure Pulse Technology

•Predominance to displacement: no control over dispersion.

•Tailored for displacement or dispersion.

•Injected fluid tends to channel or finger

•Injected fluid tends to disperse or mix at the pore scale

•Injected fluids have tendency to propagate towards regions of low pressure: dominated by high permeability channels.

•Injected fluids have tendency to propagate towards regions of low pressure: less dominance by high permeability channels.

•For a given porous media and fluid, injection rate governed by magnitude of injection pressure.

•For a given porous media and fluid, injection rate governed by injection pressure, rate of change in pressure increase, and dilative capacity.

•A quasi-static process. •A dynamic process.

Comparison of Pressure and PPT Injection

The pulsing tool generates a fluid displacement wave in the porous media.

Akin to ripples from a stone thrown in a pond, the wave retains energy as it travels through the porous media.

These ripples generate high liquid acceleration through the pore throat, overcoming capillarity.

The critical factor for pressure pulse technology is generating the correct pulse shape at the optimum frequency.

The best known example of a fluid displacement wave is the Tsunami.

contaminant

PPT and Fluid Displacement Waves

Permeability and PPT Relationship

PPT Tuning Analogy

Low FrequencyHigh Amplitude

High FrequencyLow Amplitude

Medium FrequencyMedium Amplitude

Flow RatePermeability

• Where deviation is low, a mechanic-hydraulic system is used to generate the pressure pulses

• The system can be run in casing or tubing provided the ratio of setting ID to minimum ID is not too great

• Ideally, the hole size available should be as large as possible

feed lines from surface

fluid by-passvalves to control

influx rate, stroking

fixed body, sealed on belowcasing by packers

moving piston

cable for data

downhole hydraulics/pneumatics

cased andperforated orscreened well

instrumentation

PPT Tool Concept

The Importance of Dynamic Flow

June 2000 – First Environmental PPT

VugularZones

•Rate of LNAPL recovery significantly increased: greater than 250% quicker.

•Environment and Industry Canada Technology Verification Certificate Received.

PPT Waterflood – Queens, NY

Increase duringtest Increase 24 hrs after test Increase 48 hrs after test

quasi-static injection January PPT injection March PPT injection

MW-103A12’ from injector

Increase duringtest

Increase 24 hrs after test Increase 48 hrs after testPro

MW-20226’ from injector

quasi-static injection January PPT injection March PPT injection

Increase during test Increase 24 hrs after testIncrease 48 hrs after test

quasi-static injection January PPT injection

MW–40325’ from injector

IncreaseDuringTest(ft)

InjectedFluid(gal)

Product levelIncrease per

Gallon(ft/gal)

Quasi-static injection 0.54 796.8 68 x 10-5

January PPT injection 0.02 270.0 7.4 x 10-5

March PPT injection 1.13 514.8 220 x 10-5

PPT increase over Quasi-static Injection by 3.2

PPT Waterflood – Queens, NY

Conformance in a Dual Permeability System

NAPL Contaminated Interval

7.5 ft from PPT well

15 ft from PPT well

PPT Well

• •

••

Monitoring Wells

Injection Conformance

Formation Pressures 7.5 ft Away from Pulse Well

28-Oct-02 00:00 28-Oct-02 02:24 28-Oct-02 04:48 28-Oct-02 07:12 28-Oct-02 09:36 28-Oct-02 12:00 28-Oct-02 14:24 28-Oct-02 16:48

Obs Well A Obs Well B Start Pulsing Stop Pulsing

Static Injection PPT Injection

Pressure data for course grained sand and gravel

Pressure data for fine grained sand

EZVI – NASA Pilot Program 2002

EZVI – NASA Pilot Program 2004

Bench Scale Creosote Treatability Study

•Post PPT waterflood creosote saturation 38.9%.

•Initial creosote saturation for each test ~87%.

•Post PPT surfactant flood creosote saturation reduced to <2%.

Summary of PPT

PPT represents a truly effective method for the mobilization and recovery of contaminants and a delivery mechanism for the dispersion of amendments at the pore scale. It is unique.

PPT is an enabling technology. It allows for better controlOf fluid injection.

PPT is a tool in the overall strategy for the remediation of contaminated sites. Proper implementation will aid in reducing long-term liabilities and overall clean-up costs.

Pressure Pulse Technology: An Innovative Fluid Flow ...It is a quasi-static phenomena. Mega...

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