PROCESS OF DEVELOPMENT OF OIL FIELD Russian patent published in 2003 - IPC

FIELD: oil industry. SUBSTANCE: process includes cyclic flooding with periodic injection of water into injection wells from cluster pumping station through pressure pipe-lines and extraction of oil from production wells. Injection wells are grouped depending on penetrability of pools opened in them with subsequent establishment of quality of water to be pumped into each group of injection wells. Water is specifically evaluated by three qualities. Water is characterized by different ( increasing ) contents of solid particles and by different ( increasing ) sizes of particles. Oil output is raised as water is injected through pressure pipe-lines at start of first quality, then at start of second quality and later at start of third quality without washing of these pipe-lines. EFFECT: raised oil output from production wells thanks to involvement into development of lowpenetrable oil- bearing pools. 1 dwg, 1 tbl