科研之友
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摘要
Currently approximately 40% of world oil production comes from mature fields and the tendency is that this will increase with time. A significant portion of operational expenditures in mature oil fields is related to lifting costs, including the cost of maintenance of the artificial lift equipment.
In many cases additional unnecessary costs are incurred due to inadequate control of corrosion and sand production, leading to premature failures of the equipment and thus to additional workover operations. In mature fields this can result in a significant loss of reserves when the production has to be abandoned prematurely because workover operations become uneconomic.
In order to combat such losses of reserves RAG and its partners have developed fit-for-purpose technologies such as: continuous control of the liquid level in the annulus (i.e. bottom hole flowing pressure), innovative advanced sand control and longer lasting artificial lift equipment.
On the basis of the 75 years old Zistersdorf oilfields the value of these developments in artificial lift technology is demonstrated. The Zistersdorf oilfields produce primarily from the compacted and fairly permeable "Sarmat" sandstone formation, which has many layers, whereby the higher layers are poorly consolidated. The fields are currently producing from 33 producing wells some 6900 m(3)(V-n)/d gas and 48 t/d of oil at an average water cut of 97.1%.
It will be shown that the implementation of the technologies described in combination with the in-house knowledge and the dedication of the field staff has considerably extended the mean time between failures of the equipment, reduced markedly the average yearly decline rate and thus extended the economic life expectancy of the fields and increased the ultimate recovery significantly.
- 出版日期2013-9
