The Study On Operating Cost Variation In Low Permeable Blocks Of Jilin Oil Field

The reserves with lower permeability account for about 22.4% of China's oil and gas resources ,Presently, there are no systematical and integrated studies and scientifit theories on the management and estimation of the operating cost in low permeable oil field of China ,and What we use in operating cost management and estimation is empirical data and accounting practices . Especially in JiLin Oil field ,which is a typical low permeable oil filed ,there is no a systematical studies on the operating costs,therefore, It's necessary that we conduct a systematic and scentifc studies on operationg cost in low permeable blocks of JiLin oil field.Low permeability is a relative conception,It's generally accepted that the oil filed with permeability below 50×10-3μis low permeable oil field according to oil development experiences and scientific studies.The operating costs will increase gradually with the oil production declining ,and the operating cost is an important part of oil production cost,It includes,the direct raw material , direct materal for fueling ,direct cost for electricity, direct labour expenses ,the injection cost for oil driving ,cost for wells workover,well logging cost,maintainness cost,cost for heavy oil production,cost for light hydrocarbon collecting,cost for oil and gas treatment,transportation cost,administrative cost,and other direct material,cost for oil product used by company.among these costs, the direct raw material , direct materal for fueling ,direct cost for electricity, direct labour expenses are easy to control and usurally be classified as fixed cost; the injection cost for oil driving ,cost for wells workover,well logging cost,maintainness cost,cost for heavy oil production are not easy to be controlled and monitored,and usually are classified as cost that is techenology related ; cost for light hydrocarbon collecting,cost for oil and gas treatment,transportation cost,usually take place in the intermediary station for oil and gas treatment; cost for light hydrocarbon collecting,cost for oil and gas treatment,transportation cost,administrative cost,and other direct material mainly take place in the oil production company and oil production factory.among the operating costs in low permeable oil field ,such costs,as cost for well workover, cost for direct material,cost for electricity usually account for about 50% of the total costs,and accordingly,these costs become the important factors that affect the operating costs.therefore ,to study the principle of the operating cost variation,we should start with the important factors that affect the operating costs,try to collect historical documents ,try to make a careful anylisis on the consumption variation of material ,fuel,electivity,at the same time,try to make a careful anylisis on the volume of well workover,the volume of water injection,the volume of oil and gas treatment,the volume of well logging,after finishing this anylizing work,we try to make a careful anylisis of cost structure, the ratio of different cost element,the historical data,the cost budget and the advanced cost level among the similar companies of same sector.By doing these works,we can summarize the principle of the operating cost variation in low permeable oil field.Accordingly we can create a model by means of statistical anylisis, dynamic anylisis and time order anylisis.By the works mentioned above,we can figue out the principle of operating cost variation accordint to per ton of oil or liquid,and the relationship between the operationg cost and the oil field development parameters,such the volume of oil production and liquid production ,the level of oil recovery and watercut , ant etc.Through conducting an operating studies carefully and scentificlly,we discovered the principle of operating variation in Xin Lin blocks of Jilin oil field as follows.1.The marginal cost of Xinlin oil field go up increasingly with the development of oil field ,that means the cost for per ton oil increase accordingly,these discoveries are in line with the level of oil recovery and oil develop;and we also find the tendency that marginal cost for per ton liquid goes down is conform with the tendency that watercut go up recently in XinLi oil field. 2.The principle of the operating cost variation per well is that it go up firstly and then go down gradually ,and tend to be stable after the year of 2000,the average operating cost is between 46000-54000yuan/per well.but the overall operating cost increase ,that indicate the cause of increasement of overall operating cost is due to the increasement of well and material prices.3.The marginal cost for well workover in Xinlin oil field gradually,as of 2005,the accumulated oil production volume is about 1100×104t ,and the marginal cost for well workover is 27.8 yuan/per ton.4.The the ration of cost for fuelling accounted in overall operationg cost go up gradually in Xinlin oil field ,as a result,it has become one of most important part of the operating cost.the cost for fuelling make up only a small percentage of operating cost before 1994,and it reached it peak in number of 774000yuan in 1993,but the ration it accounted for the operating cost is below 5% before 1994,and the ration began increased rapidly after 1995,and it reached 17% by 1997,and it reached about 20% after 1997,ant it approached it peak in percentage in 2001 with the percentage of 20%.5.The cost for electricity take a great part in the overall operating cost,even though the cost for electricity tend to be going down,it still accounted for 20% of the total operating cost.Xinli Oil field is a typical blocks in Jilin oil field, We can draw a similar conclusion about operationg cost from that of principle in XinLin oil field.we can contor and predict the principle of operating cost variation accordingly,and optimize the study of oerating cost according to this principle.