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Fairley

The Fairley field is located some 45 kilometres northwest of Seria, in water depths of about 60 metres. The field consists of four separate accumulations spread over an area of 14 by 16 kilometres (Figures 5.42 , 5.43 and 5.44).

Well Fairley-1 discovered gas in the Block 1 structure in early 1969. By mid-1971, the other three widely separated accumulations comprising the field had all been discovered oil-bearing, FA-2 in block 2, FA-4 in Block 4 and FA-5 in Block 20 (Figure 5.42).

Full scale development commenced in 1972 with drilling from a platform (FADP-1) situated in Block 2 and continued into 1982 with the installation of a fifth drilling platform on the gas-bearing Fairley Block 1.

To date (1/1/96), 63 wells have been drilled in the field, of which 34 are producing. The field has some 210 reservoir units. The oil is light and waxy with an average density of about 40 API (875 kg/m3). Average production rates during 1995 from the four developed blocks were 1,320 m3/d liquids (1,110 m3/d of oil and 210 m3/d of condensate) and 3.1 million m3/d gas. The ultimate recovery for the field is estimated at 31 million m3 oil (36% recovery), 3.7 million m3 of condensate (46% recovery) and 56 109 m3 gas (80% recovery).

Initial reservoir pressures in all blocks were near hydrostatic down to about 2,750 metres. Below this depth, increasing overpressures are encountered, with a maximum observed pressure of nearly 63,750 kPa (9,250 psi) at 3,500 metres.

The reservoir drive mechanism varies from a relatively strong waterdrive in the open flanked Blocks 1 and 20 (where oil recovery factors of up to 50% are common), moderate in Block 2 to a weak water drive in the fault-bounded Block-4 (where recovery is only about 20%).

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