wet gas compression - calgary pump symposium · wet gas compression 1 calgary pump symposium 2005...

1Wet Gas CompressionCalgary Pump Symposium 2005

Britta Schöneberg

Joh. Heinr. Bornemann GmbH, Germany

Wet Gas Compression

with Twin Screw Pumps


Definition

Multiphase pumping should be called

‚Wet Gas Compression‘ when:

• the GVF (Gas Void Fration) exceeds 98%.

• only a few liquid slugs occur, if any.

• the associated liquid is of low viscosity.


Type MWType MPC

Multiphase Pump Types Bornemann


Twin-Screw Pump


Sectional Drawing type MW


C R O S S

E

C

T

V I E W

O

N

A

L


Internal Recirculation Valve


Design Features type MW

• Pressure Rating

ANSI 300 lbs

• Replaceable Liner for easy Maintenance

• Engineered Rotor Set

• Single acting Mechanical Seal with atmospheric Quench System

• Welded Construction


Buffer Fluid System

Upper Buffer Vessel

Lower Buffer Vessel

Mechanical Seals


Operational Features

• Capacity up to 280.000 BPD / 1800 m³/h

• Inlet Pressure up to 290 psig /20 barg

• Differential Pressure up to 700 psig /50 barg

• GVF up to 97%

• Dry Running approx. 30 min. without external liquid injection or cooling


• Large scaled internal

separation chamber for liquid storage

• Internal recirculation of liquid for even heat

distribution

• Reverse flow

Pump-Compressor Design


Sectional Drawing


C R O S S

E

C

T

V I E W

O

N

A

L


Design Features MPC type

• Pressure rating ANSI

600 lbs to 1500 lbs

• Replaceable liner and engineered rotor set

• Liquid flooded rotating elements

• Welded construction

• Top connections


Operational Features MPC type

• Capacity up to 300.000 BPD / 2000 m³/h

• Suction pressure up to 1300 psig / 90 barg

• Differential pressure up to 1350 psi / 95 bar

• Dry running up to 1 hour

• Average GVF up to 99%


Benefit

What is the benefit of wet gascompression with twin screw pumps:

• Boosting the gas production by

adding energy to an untreated wellstream.

• an increase of the gas production

by reducing the wellhead pressure.


Pump Design

With little liquid occuring in the wet gas stream, it need to be made available. This can be done by storing it inside the pump

housing itself.

Internal re-circulationLarge scaled internal chamber


Compression Heat

Compression of gas will generate heat.Therefore the pump filling needs to be cooled.

This can be done by:

• Liquid Recirculation

• Liquid Cooling


Liquid Recirculation

In case the pump temperature exceed a certain levelliquid can be injected into the inlet side of the pump.

M

M 2 PhaseSeparator

toproduction

fromwells


Liquid Cooling

M

M

toproduction

from

wells

In case the available volume of liquid is not sufficient to keepthe pump temperature at a reasonable level, the liquid inside the

casing needs to be cooled down.


Field Cases

Inlet

pressure

Discharge

pressure

% Sm³/m³ m³/h Sm³/h MPa MPa m³/h kW

I - onshore CDN 97 283 30 8480 0.8 2.2 984 799

II - onshore NL 99.5 6895 3 20686 3.5 7.0 585 705

III - offshore NL 99.5 3044 6 18262 1.8 3.5 925 500

Shaft

powerLiquid Gas

ProjectGVF GLR Capacity


MOBIL, Canada, MPC 335 - 100, 1997

GVF 97 %

GLR 1613 SCF/BBL

p inlet 116 psig

p disch. 319 psig

Capacity 148 MBPD

Speed 2200 rpm

Power 1071 HP


Liquid Recirculation

from wellsto production

MPP 1

MPP 2


GVF 99.9 %

GLR 44,841 SCF/BBL

p Inlet 500 psig

p Disch. 1,000 psig

Capacity 68 MMSCFD

Speed 1,800 rpm

Power 1,000 HP

NAM, The Netherlands, MPC 335 – 60, 1999


Liquid Cooling

to production

from wells

MPP

Cooler


Heat exchanger for pump filling and gas engine cooling system


NAM, Offshore Netherlands, MPC 335 – 100, 1999

GVF 99,5 %

GLR 17,038 SCF/BBL

p inlet 220 psig

p disch. 580 psig

Capacity 176 MBPD

Speed 1,800 rpm

Power 670 HP


MPP

from wells

to production

to production

Liquid Cooling

Cooler


Heat exchanger sized for pump filling only (K 15 FB)


• Wet Gas Compression with Twin Screw Pumps is feasible.

• Compression heat is removed by liquid circulation.

• The commercial approach should consider the complete system.

Conclusion


Thank you

for your attention !


Multiphase pumps in CSS operations


Why the Need for Vapor Recovery?

• Annulus gas conservation

• Eliminate flaring & flare emissions

• Maximize the steam cycle

• Recovery of gas affects economics

• Address military concerns


Why Use a Multiphase Pump?

• Conventional Equipment:

– Reliable, well known to operations

– Individual components inexpensive

– Total installation fairly expensive

• Multiphase Pump

– Overall capital cost reduction

– Wide operating range

– Less overall maintenance support


Minimum Maximum

Ambient Temperatures

- 40 deg. F + 95 deg. F

Annulus Gas 50 deg. F

3 psig 10% Water Vapour

320 deg. F 150 psig +

60% Water Vapour

Bitumen Emulsion 0.5 cP Viscosity

122 deg. F 25,000 cP Viscosity

320 deg. F

Challenges


Norman Wells

Sable Island

CanadaU.S.A.

Calgary

Edmonton

PEACERIVER

ATHABASCASyncrude

Cold Lake

100 mile

125 km

WABASCA

ALBERTA


Cyclical Steam Stimulation (CSS):

– Huff and Puff operation -wet gas collected from casing annulus.

– Sour gas composition changes during the cycle from 80% CO2 - 20%.

– Temperature is close to saturated steam, ~ 266°F at typical suction pressure.

– 20 - 30 wells on a pad.

– Pad level gas design rate of 30,000 sm3/d (~ 1 MM scf/d).


Inlet Pressure 1.6 barg 23 psigDischarge Pressure 14.0 barg 203 psigTemperature 90 o C 194 °FVolume 600 m3 / hr 91 MBEPDSpeed 1785 rpmMotor 300 kW 400 hpGas Volume Fraction 95 %

Pump Type MW 8.5 zk - 85

Design Conditions IOR


Vent Gas PFD and Equipment Summary

Discharge Scrubber

Vent Separator

Blackmeredischarge to trunk line

Shell and Tube

Condensate Separater

Grundfossdischarge to trunk line

Nash Liquid Ring Compresser (2)

Seal Water Cooler

Gas to

trunk line

Glycol Aerial Cooler

Glycol PumpGlycol to shell & tube, and plate& frame

Aerial CoolerVent Gas

Multiphase Pump

Liquid Trap

Recycle Liquid

Liquid

Overflow to Group

Liquid Level

Compressed Gasto Group

Conventional Process Flow3 pumps

3 vessels

3 exchangers

2 compressors

Multiphase Process Flow1 pump1 vessel1 exchanger


GVF 95 %

GLR 279

p inlet 24 psig

p disch. 131 psig

Capacity 93 MBPD

Speed 1780 rpm

Power 373 HP

IOR Operating Parameter


Drawing Key

PrimroseSteam Plant

CSS Well Pad

Pipeline Corridor

CSS Well Horizontal Leg

CSS Well Build Leg

Field Lay-Out

CNRLCANADIAN NATURAL RESOURCES


Inlet Pressure 1.1 barg 16 psigDischarge Pressure 15.0 barg 217 psigTemperature 125 o C 257 °FVolume 630 m3 / hr 95 MBEPDSpeed 1785 rpmMotor 225 kW 300 hpGas Volume Fraction 96 %

Pump Type MW 8.5 zk - 85

Design Conditions CNRL


VFD

TY

PY

FY

500 HP MW 8.5-67

Multiphase Pump

3 Phase Separator

Recycle Water Cooler

The Process


CoolerManifold

BuildingMultiphase Pump

Building


Thank you

for your attention !

wet gas compression - calgary pump symposium · wet gas compression 1 calgary pump symposium 2005...

Documents