Research On Calculating And Analyzing Of Efficiency Of Water-injection System In Sazhong Region

Water-injection is one of the main oil-production in domestic oil field. It can efficiently supplement the formation energy, it have active effective in enhancing crud oil recovery.guarantying high,stable production of oil field.But the cost to maintain water-injection system takes a large percent in the cost of petroleum development, about 30~40%,therefore it have practical meaning to study the optimum control technique of water-injection system to decrease energy and cost.Water-injection system in oil field is mainly of electromotor.water-injection pump,flow control valve at the outlet of water-injection pump,water-injection pipe network,well-head and injection well and so on. Except the effective energy that injected into formation.energy of the water-injection system was consummated at electromotor,water-injection pump.control valve, pipe network,wellhead and well bore.thus get the total consumption of water-injection system.The energy in water-injection system can be divided into four parts: the first part is the energy to drive water-injection pump,electromotor,this part is mainly depend on the efficiency of electromotor.the energy consumption of electromotor can be demonstrated as(1-ηelec) times of total energy consumption;the second part is the energy consumption on water-injection pump.can be written asη dec (1-η pump ) times of total energy consumption.the third part is pipe network consumption(include flow control consumption at the pump outlet.along pipe network and local consumption.flow control consumption of valve group), can be written as the η elecη pump (1-η pipe ) of total consumption;the fourth is the energy needed to inject water into formation.this part of energy is mainly depend on the pressure to maintained of formation,reservoir property and the formation performance and so on.On the base of domestic and abroad relative data.according to material balance theory and fluid mechanics theory,established calculation model of water-injection system efficiency and pressure consumption in this paper. Programmed the calculation and analyze software of water-injection system efficiency amd pressure consumption Using VB6.0 language.also take 'the East-3 injection in Middle-Sa region as a example to calculate the energy consumption analyze and pressure consumption analyze,and provide the energy consumption makeup of the whole system energy consumption and makeup of pressure consumption.At last made synthetic analyze according to the calculated result,give the reasonable energy-save measurement of water-injection system.