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Advancements in
Hydraulic Dewatering
Technology
7th European Gas Well Deliquification Conference
Presented By: David Bolt – Cormorant Engineering
Hydraulic Dewatering Introduction and History
Hydraulic De watering is not new, and dates
back into the early 1900’s
For many wells there are other technologies
which are more cost effective and hydraulic
pumping has been primarily used in pumping oil
using a Kobe style pump
Todays Gas wells present challenges which
have made Hydraulic pumping a desirable
technology
Cormorant Engineering is focused on this
technology and continues to advance the
performance, cost effectiveness, and life
2
Hydraulic Dewatering Technology
Downhole Pump Designs
Single Acting – Power fluid driving reciprocating pump one direction, restoring
force by hydrostatic head difference
Dual Acting – Power fluid driving the pump both directions
Pulse Pumps – Either single or dual action pumps with switching valve on
surface, sending pressure pulse downhole each stroke
Self Reciprocating Pump – Dual action pump with directional switching valve
downhole
Other hybrid designs
Surface Equipment
Typical hydraulic power unit
Power fluid – Closed system
Power fluid makes a complete loop from HPU downhole and back to the HPU
Water based power fluid – Open system
Power fluid mingles with the production fluid on the return
Hydraulic Dewatering Technology
We have focused on improving:
The production rate limitations of “Pulse” style pump
The costly completions of Kobe style pumps
Life of Kobe style pumps
Cost of deployment and retrieval
Deep Wells with small bore completions
The result of these efforts has created two new pump design concepts:
The first conceived by Bert Lugtmeier of Shell Nam and further
developed by Cormorant is:
Single Line Up Reciprocating Pump or S L U R P (Shell Patent Pending)
The second is the Cormorant HG Pump
SLURP Pump
Pulse style pump running with Produced
water as the power fluid
Power one direction stroking a piston
and compressing a Nitrogen spring
Nitrogen spring returns the pump piston
and water plunger
Deployed via 2 inch coiled tubing with
BHA on end
Pump is wire line retrievable
Operation – Power Stroke
1. Apply pressure from surface
2 Piston forced down, compressing the Nitrogen and forcing the water
from the water pump section
PRESSURE APPLIED PISTON DIRECTION
NITR
OGEN
WATER FORCED
FROM BARREL
Operation – Return Stroke
1. Release pressure from the surface
2. Piston forced upward due to the compressed Nitrogen
3. Water is drawn through the gas anchor, standing valve and into the
pump barrel
NITR
OGEN
Piston DirectionPressure Released
Wat
er
Ente
rs f
rom
Fo
rmat
ion
SLURP - Performance
Cormorant Adapted their
predictive model to
accommodate the SLURP
Based on the Cormorant Finite
Element Work in a 3500 m well
Production rates are: 2-4 m^3
per day
SLURP Status and Next Steps
Basic design modeling is complete
Basic Solids model complete
Next steps:
Detail Design engineering
Detail Design
Prototype build
Surface Equipment Design
Timing: Prototype testing planned for Q2 2014
HG - SRP Pump is a dual acting Self reciprocating
pump
Deployed via Coiled tubing
Single in US
Concentric in Europe
Pump is retrievable simply by reversing the
direction of the fluid flow
Incorporates a self reciprocating valve
function
Production rates into 100s of barrels per day
Improves life over previous Kobe pumps by:
Metallurgical improvements in the valve
technology
Improved design characteristics of valve
operation
Ceramic valve parts
CFD developed flow regimes for energy
optimization as well as run away control
HG - SRP
Water section is basic Rod Pump
Pump area ratios allow for a low surface
operating pressure for deep wells
Maximum surface pressure 3000 psi for
equipment life and reliability
Construction materials well dependent
H2S, CO2, Ph, etc.
HG – SRP Completion
Uses 2 3/8 Production tubing with pump seating nipple
Or 2 ¼ in coiled tubing with PSN installed
1.75 Coiled Tubing with Bottom Hole assembly
BHA sits in PSN
Incorporates a Standing Valve
Gas Anchor
Screen
Pump is deployed by circulating water in the Coiled Tubing and “pumping
the pump in Pump Seating Nipple Production tubing or Coiled tubing
Coiled tubing with bottom hole assembly and Standing Valve
HG – SRP Pump Retreival Retrieve pump by pumping water through the Tubing x Tubing annulus
Pump travels to surface and is caught in API lubricator
Pump Seating Nipple Production tubing or Coiled tubing
Coiled tubing with bottom hole assembly and Standing Valve
HG Surface System
Simple surface unit
Main Components
Medium pressure water
pump – 3000 psi (200 bar)
Chemical injector pump if
necessary for well / pump
life
Set of valves directing
power fluid for pumping or
retrieval
Pump inlet filter which back
flushes during retrieval
Pump power is
programmable for desired
pumping rate
HG SRP – Development Timing
Downhole pump prototype complete
Testing on going for life and reliability
Surface System Pump development underway
Ready for deployment Q2 2014
End of presentation