Technical and economic limit of old oil wells at the super-high water cut stage in Lamadian Oilfield;

Based on break even theory, the economic limit models and the relative graphs about the shut in water cut limit, single well production limit and stimulation well treatment limit are derived according to the actual development data of Lamadian oil field.

There is a reasonable economic limit between general overhaul and renewal of mechanical equipment.

Based on the analysis of technical and economic benefits,it is pointed out that theeconomic limit point of equipment overhaul must be defined.

The method of calculating the economic threshold productivity of the long-closed well after recovery can not meet the demand of field practice completely for only considering the adequate condition on economy but ignoring other necessary conditions.

Based on a lot of first-hand materials by the practical research and using economy of agricultural technology and other modern analysis methods,we analyzed the multi-level economic benefit of citrus Bed-Planting technology from the views of its effects on yield and income increase,the evaluation of its economic benefit and economic critical point of its yield incremental.