Oil & BTEX Removal – CO2 Reinjection

CUSTOMERS: International Oil & Gas Company
LOCATIONS: Onshore Site, Western Australia

Application

Removal of Oil & BTEX in the produced water stream from Primary Water / Condensate Separator

FLOW RATE

Flow Rate up to 1 Ocu.m/hr

OBJECTIVES

Process water with contaminant levels:

Oil in emulsified form and BTEX

TPH 467.8 mg / L nil
Grease 837-7 mg / L

RESULTS

Discharge levels with OLEOLOGY:

TPH 22.1 mg / L
Oil & Grdse 59.3 mg / L

FOOTPRINT

Complete Package Size 8250mm (L) x 2600mm (W)

PACKAGE BUILT TO FOLLOWING DESIGN & STANDARDS

  • Materials — 316L and 304L Stainless Steel
  • Piping – ASME I331.3
  • Pressure Filter Vessels – AS1210
  • MyCelx Advanced Coalescer — ASME VIII
  • Structural Steel — AS4100
  • Full PMI to Client specification

Company profile

This major oil and gas exporter worldwide
Full site facilities to enable onshore and offshore production

Technical situation

The site requirement is to manage expected concentration of oil in water (up to 5%) which is a mix of free, dispersed and soluble hydrocarbon and BTEX, droplet size was unknown.
Each production train (a total of 3 trains) was required urgently for site installation. Upstream process water discharge of treated water in accord with EPA requirements of less than 50ppm.

Solution

The primary oil removal stage MyCelx Advanced Coalescer (MAC) significantly reduced oil levels, allowing only oil to be discharged in a separate discharge point and then followed by a series of MyCelx Polishing Filters.
The Polishing Filters are designed as a Duty & Standby to not disrupt the processing while filter changing occurs. If the produced water alters in the future, the MyCelx filters can be changed to different MyCelx polishing filters and installed by onsite personnel with no special tools. The simple and almost non-existent maintenance and monitoring equipment allows minimal human interaction with the treatment package.
There are no pumps and thus no shearing of hydrocarbon droplets into the water prior to the MAC coalescing separation. The oil separation process allows for only oil to be discharged, minimising the water in oil, to generally 95% oil only, in the separated and discharged oil/HC.
The fixed coalescing technology of the MyCelx MAC does not have any loss of efficiency during “turn down” or lower flow states. During lower flow (increased
contact time) the efficiency of HC separation can increase through the MyCelx MAC.
From customizing the design of the treatment package to manufacturing the system, was completed in 6 months, while maintaining quality control, material traceability records and manufacturing to ASME B31.3 & AS1210 standards.

Benefits & Impact

M easurements below were taken at different times to indicate the fluctuation of inlet produced contaminant levels.

Total Petroleum Hydrocarbons (TPH) Results
93% Reduction across entire skid – 467.8 mg / L to 32 mg / L
88% Reduction across MAC (Stage 1) – 476.8 mg / L to 57.8 mg / L
86% Reduction across Filters (Stage 2) – 163.1 mg / L to 22.1 mg / L
Oil & Grease Results
90% Reduction across entire skid – 837.7 mg / L to 87 mg / L
82% Reduction across MAC (Stage 1) – 837.7mg / L to 154.3 mg / L
64% Reduction across Filters (Stage 2) – 163.2 mg / L to 59.3 mg / L

  • Install & Commissioning simpler & quicker
  • Hydrocarbon Separation >99% free oil removal – No Loss of separation efficiency with flow turn down
  • Increased separation efficiency with reduction of flow
  • Efficiency of oil separation – Stage 1 – MyCelx MAC > 99% free oil recovered
  • Separated / recovered oil >95% oil purity with minimal water in the waste / recovered oil
  • No rotating equipment in the OLEOLOGY package – No rotating equipment failures
  • Environmental Compliance

Further Information

Please call OLEOLOGY 1300 948 756 or email sales@oleology.com.au