| This oilfield was invested in 1999,the main development is Putaohua reservoir.In 2013,the development of this oilfield steped into the high water-cut period.The comprehensive water-cut is 66.7%,with the water-cut increasing gradually,and the output decreased.In order to find out whether the increase of water-cut and production decline is in accordance with the law of oilfield development.Whether the speed of fluid and oil produced are reasonable.and provide the reliable theoretical basis for the development of oilfield in future.I gained the following acquaintance:1.Studying on the development law of Putaohua reservoir.Applying the arps decline prediction method to analyze the development law of 20 development units,and calculating the production decline rate of these 20 units in the whole oilfield for 5 years.According to the relative permeability curve to draw the relationship curve between water-cut and water-cut with different permeability,and the water-cut rate of rise in different water cut stage is clear.Analyzing the rate-maintenance capability of 20 development units in the whole region,and the prediction results of each unit recovery factor are given according to the arps decline prediction method and the tongshi chart.2.Evaluating oilfield development effect,establishing the evaluation system of geological characteristics,and evaluating the geological factors of each development unit;The instantaneous water extraction ratio of each unit was calculated,and the historical development effect was evaluated.The current status of each development unit is evaluated,and the contradiction problem is pointed out and the adjustment order is given.3.Researching on the policy limit of oilfield development.Formulating the adjustment countermeasures of blockette by meshing reasonable oil-water ratio,reasonable injection-production ratio and reasonable flowing pressure,etc.and to improve the reservoir production degree,control the production decline and water cut speed. |
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