Design And Research Of A New Type Of Electromagnetic Downhole Vibration Recovery Unit

With oilfields development extending over time, the production and injectivity index of the oilfields will significantly decrease. The main reason is that the mud?paraffin gum? asphaltene deposits?dirt?emulsion and other mechanical impurities block the aisle of pore, which results in the oil permeability?production and recovery decrease. Compared with other types of physical and chemical methods, vibration oil recovery, as a main physical recovery way, has distinct advantages in equipment investment, operation costs, working area and effects in case of stratum blockage. The new downhole device of vibration oil recovery form the acoustic waves in the oil reservoir and reach the deplugging effect. Vibration oil recovery technology is an important component part of the physical oil recovery technology, and work in the stratum in the way of powerful energy working. It make oil and fluids have different physical and chemical changes, which change the condition of oil seepage?remove oil blockage?clear oil flow channel?and create the environment of oil flow. At last, the oil wells have an increasing production.By fully analyzing the current domestic and foreign device of vibration oil recovery and the inadequate of device of vibration oil recovery, the paper designs a new type of downhole device of vibration oil recovery--downhole low-frequency and high-power electromagnetic device of vibration oil recovery, and has the associated design and research, as follows:(1) Based on reading the literature and analyzing?summarying the current domestic and foreign technology of vibration oil recovery, and according to the reluctance minimize theory, the paper designs the downhole low-frequency and high-power device of vibration oil recovery?center pole and sound radiator which has an effective function in magnifying the lateral movement. In the actual working conditions, we design and calculate the main designing parameters?the constituent materials?the axial load and the resonant frequency of radiant panels of sound radiator and center pole.(2) The paper designs the structure of radiant panels of sound radiator and avoids that the installation space has a volume constraint to functional material; by the dynamics modeling and analyzing of the radiant panels of sound radiator, we get the the inherent vibration mode function and the lateral deflection curve in the axial loads, and verify the obtained results by the way of example simulation. By the analysis, the results show that:the pre-curved radiant panels structure can increase the lateral displacement amplitude of radiant panels very well. When the axial harmonic force works in the sound radiator, the parameter vibration has a stable movement area and the linear damping can not play the role of inhibiting amplitude growth in the parametric resonance, but it can reduce the unstable region (reduce the energy transmission of radiant panel).(3) Having the electromagnetic analysis of linear actuator by Ansoft, the paper determines the optimal structure and structural parameters of linear actuator, and calculates the magnetic flux density?electromagnetic driving force and axial output displacement of linear actuator.(4) Firstly, the paper analyzes the mechanism of acoustic waves to oil reservoir.Then, in the LMS Virtual.lab software, the paper builds the model of downhole vibration device? casing and oil reservoir?determines the boundary conditions and makes a acoustic response analysis on the sound radiator model under a constant and harmonic load working by using professional acoustic simulation software-LMS Virtual.lab Acoustics. Lastly, based on the top analysis model, we analyze the transmission loss of acoustic waves generated by the sound radiator in the oil reservoir.(5) The paper proposed several downhole fixed structure of vibration device, and analyzed the options of installation under the different oil wells conditions and requirements of oil recovery. The electromagnetic coils for linear actuator device were designed and calculated to determine the specifications of the coil wire?turns and other geometry, and analyzed the temperature control and ground power controller of device of vibration oil recovery. According to the analysis, the paper presented in two ways to avoid the high temperature of device of vibration oil recovery, and the control schematic of device of vibration oil recovery.