Wellhead & Wellstream Desanding Solutions for Offshore

Wellhead & Wellstream

Desanding Solutions for

Offshore Production in Malaysia

Produced Water Society – 24th Annual Conference

January 14-16, 2014

Houston, Texas, USA

Presented by: Steve Coffee

Overview

• Solid Problems

• Solution

• How It Works

• Testing, Pilots & New Installations

• Results

• Other Technologies Considered

• Conclusions

Solids Problem

The degree of sand production is dependent upon several factors,

the most common are listed below:

- degree of consolidation

- completion

- sand grain size

- uniformity of the sand

- anisotropy

- overburden and reservoir pressure regime

- permeability

- fluid production rate

- permeability

- oil viscosity

Sand Production

0 100 200 300 400 500 600 700 800

20

15

10

5

Cumulative Sand Production by Volume, m3

Production Rates Vs. Cumulative Sand ProductionAfter Loughead & Saltukaroglu, 1992

Oil

& F

luid

Pro

duct

ion R

ate

s, m

3/d

ay

Fluid Rate Oil Rate

Figure 2

Solution

ESI Desander

How It Works

Enerscope Desander Performance

Particle Sizes in the

System

Solids Distribution in

the System

Enerscope

Capability

Expected

Enerscope

Performance

> 74 Microns 15% 98% 14.7%

74 – 40 Microns 30% 95% 28.5%

40 – 20 Microns 35% 84% 29.4%

< 20 Microns 20% 50% 10.0%

Aggregate Solids Removal Capability: 82.6%

Initial Testing

TE-45 : - Production = 900 bpd (water cut 0%)

- GOR = 0.5 Mscf/stb.

- Sand production 20 pptb (lb/1000 bbl)

- Sand size ranges from 20 to 125 mesh

- Production expected to start at 400 bpd

BO-210L: -Production = 800 bpd (water cut 50%)

- GOR = 0.8 Mscf/stb.

- Sand production 20 pptb (lb/1000 bbl)

- Sand size > 100 mesh

- Production expected to start at 400 bpd

Desander Offshore

Initial Testing

BOKOR B-210L

TEMANA TE-45

Production (bpd) 604 - 1050 378 - 680

Gas production (scf/stb) 500 500

Water production % 30 0

Sand particle size (micron) 50 50

Shut-in pressure (psig) 1100 470

DPEH pressure setting 16 psig 16 psig

PEH pressure setting 1050 psig 425 psi

Sand count (history) 50 PPTB N/A

Testing

New Wellhead Installations

The wells selected had the following selection criteria:

150-3,700 bbld

675-2,025 psi (46-140 barg) inlet pressure

30 to 93 C

20 to 80 mg/l of solids (slugs up to 20,000 mg/l)

5-30% water production

Solids sand, silt, grit, scale, clays, iron oxide

Oil to be light to medium

Desanding P&ID

New Desander Installations

PMO: ANGSI A, ANGSI C

SKO: BOKOR A, BOKOR C, BARONIA B, BARONIA I,

BARAM H, TUKAU A, TUKAU H, WEST LUTONG A

SBO: ERB WEST, SEMARANG B, SEMARANG F

Desanding PFD

Results

Desanding Hydrocyclones

• Multiphase capabilities

• Fine separations - effluents down to a d98 of 10 μm

• Tough ceramic inserts and materials to guard against erosion and corrosion

Other Technologies Considered

Close Pack Hydrocyclones

HC - Wellhead

EHC vs ESI

ESI EHC

Recommended Min Inlet

Pressure (psi) 35 80

Pressure Drop (psi)

3-12 30-80

D95 (μm) 40 5

Service Liquid Liquid-Gas-Multiphase

Capital Investment

1x 3x-5x

Desanders

There are a number of advantages of this

system over the desanding

hydrocyclones:

simplicity

less maintenance

less monitoring

lower CAPEX and OPEX

removal of sand upstream of facilities,

treating train and distribution

Advantages

minimal change to existing process & easy to retrofit

very low, steady pressure drop (3-12 psig/0.2=0.8 barg)

continuous solids separation with no impact of product (flow or

pressure)

efficient & environmentally friendly removal and disposal of

collected solids

small foot & lightweight

no moving parts to wear out or replace

no screens, cartridges or filter elements to be cleaned or replaced

no backwashing required

online maintenance (no downtime required nor redundancy)

minimal or no liquid loss

effective solids concentration for easy disposal/recovery

Conclusion

The desanding equipment, tried and proven in produced water

applications, is easily adaptable to wellhead conditions. This is

an excellent example of the transfer of technology further

upstream to solve more problems.

Installation of desanding equipment at the wellhead is

economical, even at sand production levels as low as 10 ppm.

There are substantial economic benefits not only to light and

medium oil areas but to any areas producing unconventional

oil.

The simplicity and the efficiency of this technology gives it an

advantage for producers the ability to bring back on marginal

wells with low production rates and that are sand producers.

Some of Our Customers

Steve Coffee

steve@enerscopesystems.com

enerscopesystems.com

Questions?