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Eastern Development Zone in 1960 , Sa Daqing Oilfield invest in developing the implementation , development and deployment in batches once encryption secondary encryption adjust , to block the end of the Ninth Five-Year Plan \the oilfield development benefits is getting worse 85 years infill wells net overall casing damage well shut , even after adjustment of secondary encryption , injection-production relationship in the region is still far from perfect, only 86.3% of the degree of control over water drive reservoir utilized the situation is quite different , so in 2000 , three encryption adjustment . In recent years , three infill wells networks injection wells of old and new matching adjustment , adjust the optimization and production wells Revamp control block the natural decline rate and water cut increasing speed , better effect , while relying on the strata water injection and fluid production structure adjustment , development effect of the old wells have also been improved, block water flooding recovery , to provide guidance for the perforations in other blocks three infill wells mesh well and mining process adjustments and reference . Adjustment and studies show that three encrypted developed : block water flooding the degree of control to a 8.0% increase , the thin and poor reservoir water flooding control improved by 10.1% , the table outside the reservoir of water flooding the degree of control that a 7.8% increase ; blocks spend improved by 4.0% , including the degree of utilization of the thin and poor reservoirs increased by 12.3 % , a 4.9% increase in the utilization of the degree of balance sheet reservoirs ; three infill wells network not only production decline and cut rising under control , but also improves the original patterns development effect , the annual cut rising speed slowed to 0.9% annual production decline slowed to 2.62% ; flooding characteristic curves and numerical simulation analysis , three infill wells net increase recoverable reserves of 34.85 × 104t the block , the recovery efficiency of 1.02% .
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