Nitrogen- -Rejecting Membranes to Rejecting Membranes to Nitrogen - - PowerPoint PPT Presentation

Nitrogen Nitrogen-

• Rejecting Membranes to

Rejecting Membranes to Increase Gas Heating Value and Recover Pipeline Natural Gas: Increase Gas Heating Value and Recover Pipeline Natural Gas: A Simple Wellhead Process Approach A Simple Wellhead Process Approach

Ankur Jariwala Ankur Jariwala Kaaeid A. Lokhandwala Kaaeid A. Lokhandwala

Membrane Technology and Research, Inc Membrane Technology and Research, Inc.

. 1360 Willow Road, Menlo Park, CA 94025 1360 Willow Road, Menlo Park, CA 94025 Website: www.mtrinc.com Website: www.mtrinc.com

Outline Outline

• Application

Application – – Recapturing CH Recapturing CH4

4 from Blow down of Nitrogen

from Blow down of Nitrogen-

• Foam Fractured Horizontal and Vertical Wells.

Foam Fractured Horizontal and Vertical Wells.

• Novel Composite Membranes

Novel Composite Membranes

• Why a Membrane Process for this Application ?

Why a Membrane Process for this Application ?

• Process Designs and Economics

Process Designs and Economics

• Conclusions

Conclusions

High Rate Nitrogen High Rate Nitrogen-

• Rich

Rich Blowdown Blowdown Operation Operation in Nitrogen in Nitrogen-

• Foam Fractured Horizontal Wells

Foam Fractured Horizontal Wells

High Rate Nitrogen High Rate Nitrogen-

• Rich

Rich Blowdown Blowdown Operation Operation in Nitrogen in Nitrogen-

• Foam Fractured Horizontal Wells

Foam Fractured Horizontal Wells

Membrane Separation Mechanism Membrane Separation Mechanism

MTR’s Rubbery Membranes MTR’s Rubbery Membranes Reject Nitrogen Reject Nitrogen and Permeate Hydrocarbon and Permeate Hydrocarbon Components Components

P P1

1

D D1

1 . S

. S1

1

P P2

2

D D2

2 . S

. S2

2

=

Permeability = Diffusivity * Solubility Permeability = Diffusivity * Solubility (P) (D) (S) (P) (D) (S) Membrane Selectivity Membrane Selectivity

A membrane can separate A membrane can separate components of a gas mixture components of a gas mixture due to differential permeation rates due to differential permeation rates across a non across a non-

• porous polymer film

porous polymer film resulting in a differential pressure resulting in a differential pressure driving force. driving force.

Glassy versus Rubbery Membranes Glassy versus Rubbery Membranes

Glassy Membranes Glassy Membranes

Fast Gas Fast Gas Slow Gas Slow Gas

Rubbery Membranes Rubbery Membranes (MTR Technology) (MTR Technology)

Fast Gas Fast Gas Slow Gas Slow Gas

Hexane Hexane Propane Propane H H2

2O

O Ethane Ethane CO CO2

2

Methane Methane Hydrogen Hydrogen Nitrogen Nitrogen Hydrogen Hydrogen CO CO2

2

H H2

2O

O Nitrogen Nitrogen Methane Methane Ethane Ethane Propane Propane Hexane Hexane

Membrane System Installations Membrane System Installations

Membranes are a Mature Separation Technology Membranes are a Mature Separation Technology Gas/Gas Separation Systems Gas/Gas Separation Systems H H2

2/N

/N2

2, CH

, CH4

4

~ 200 Units ~ 200 Units O O2

2/N

/N2

2

~ 5,000 Units ~ 5,000 Units CO CO2

2/CH

/CH4

4

~ 200 Units ~ 200 Units Vapor/Gas Separation Systems Vapor/Gas Separation Systems (MTR’S Reference Base) (MTR’S Reference Base) Hydrocarbon/N Hydrocarbon/N2

2, CH

, CH4

4

~ 100 Units ~ 100 Units

MTR Membrane in Spiral Wound Cartridges MTR Membrane in Spiral Wound Cartridges

Typical Commercial Skid Typical Commercial Skid-

• Mounted Unit

Mounted Unit

Twin Bottoms Membrane System Design Flow Rate-0.2 MMSCFD NTE Membrane System Design Flow Rate-1.0 MMSCFD

Proven Long Proven Long-

• Term Separation Efficiency

Term Separation Efficiency

(400 years Cumulative Operating Experience with (400 years Cumulative Operating Experience with Silicone Rubber Membrane) Silicone Rubber Membrane)

Process Flow Diagram for Vertical Wells Process Flow Diagram for Vertical Wells

Process Scheme for High Nitrogen Feed Gas Process Scheme for High Nitrogen Feed Gas from Horizontal Wells from Horizontal Wells

Nitrogen Rejection Nitrogen Rejection – – Application Envelope Application Envelope

• Inlet nitrogen content between 4 and 30

Inlet nitrogen content between 4 and 30 vol vol% %

• Inlet flow rate between 0.1

Inlet flow rate between 0.1 – – 20 MMSCFD 20 MMSCFD

• Discharge N

Discharge N2

2 specification between 4 and 8

specification between 4 and 8 vol vol% %

• Upgrading to pipeline acceptability

Upgrading to pipeline acceptability

• Upgrading fuel gas to meet heating value for burning

Upgrading fuel gas to meet heating value for burning

• Hydrocarbon removal for nitrogen re

Hydrocarbon removal for nitrogen re-

• injection

injection

• Mobile units can be manufactured easily

Mobile units can be manufactured easily

Advantages of Membrane Systems Advantages of Membrane Systems

• Simple passive system

Simple passive system

• High on

High on-

• stream factor (typically > 98%)

stream factor (typically > 98%)

• Minimal or no operator attention

Minimal or no operator attention

• Small footprint, low weight

Small footprint, low weight

• Large turndown ratio

Large turndown ratio

• Low maintenance

Low maintenance

• Lower capital and operating costs

Lower capital and operating costs

• Units are mobile. No foundation required. Level gravel

Units are mobile. No foundation required. Level gravel

• r soil is adequate for membrane skid.
• r soil is adequate for membrane skid.

Other Applications in the Oil & Gas Industries for MTR’s Reverse Other Applications in the Oil & Gas Industries for MTR’s Reverse-

• Selective Membranes

Selective Membranes

Gas Gas: : Fuel gas conditioning Fuel gas conditioning NG Dew point Control NG Dew point Control NGL recovery NGL recovery Natural gas dehydration. Natural gas dehydration. Oil Oil: : Associated gas processing Associated gas processing Vapor recovery from storage tanks and ship vents. Vapor recovery from storage tanks and ship vents.

Other Oil & Gas Applications Other Oil & Gas Applications