Low Salinity Water Injection – Case study Heidrun Field.ppt

Classification: Internal Status: Draft Classification: Internal Status: Draft Low Salinity Water Injection – Case study Heidrun Field FORCE Seminar 15th May 2008 Einar Hegre, StatoilHydro * Outline Experimental results Background information Heidrun Field Heidrun Water injection system Upsides in addition to EOR? Challenges/obstacle for applying Low Salinity Water Injection on NCS? Way forward * Water flood results for various outcrops using HD STO at reservoir temperature * * U.Tilje well pattern * SEAWATER LOW SULPHATE WATER PRODUCED WATER * The water injection system Quality Capacity SW 37000 m3/d SRP 32000 m3/d PWRI 16000 m3/d DEAERATOR MINOX FILTRATION SRP SRP WATER INJECTION DEAERATED SEAWATER INJECTION SEAWATER WATER TREATMENT PRODUCED WATER PRODUCED WATER RE-INJECTION Near future: Installation of additional PWRI pump Increased well flexibility, possible to inject PWRI to B and C template Present Quality Capacity SW 37000 m3/d SRP 32000 m3/d PWRI 32000 m3/d Near future * Technical Feasibility Study The study scope was to evaluate Whether the existing sulphate removal package (SRP) can be converted to remove both the sulphate salts and reduce the total salinity The possibility to produce low salinity water on the Heidrun platform using reverse osmosis (RO) The possibility to place a RO pilot plant on Heidrun Evaluation is to be made for water with salinity in the range of 500-3000 ppm and the following capacities 4000 m3/d (Pilot) 16000 m3/d 32000 m3/d * Background – RO unit Feed pressure 60 – 80 bar (g) Recovery 45 % 55 % Reject 45 % Product * Typical desalination unit block scheme SEAWATER BIOCIDE CHLORINE SCAVENGER ANTI-SCALENT FILTRATION BOOSTER PUMPS COARSE FILTER 50 μM HIGH PRESSURE PUMPS RO MEMBRANE PACKAGE LOW SALINITY WATER INJECTION SYSTEM FINE FILTER 5 μM CIP SYSTEM * Modification of existing SRP unit Replacement of NF to RO membranes in the existing unit: Using only 29 bar (g)