Research On Work Principle And Application Fundamental Of Transducer For Enhancing Oil Recovery Based On GMM

The oil consumption by people and factories is increasing along with the rapid developing social economy, the exploitation of oil, however, is more difficult than before, as a result, the price of oil is largely increased and the contradiction of supply-consumption is on edge. New methods and equipment for enhancing oil recovery(EOR) are greatly needed to decrease the cost of oil exploitation, enhance enterprise's advantage in competition and satisfy the market demand. Borehole soundwave transducer for EOR that based on giant magnetostrictive material(GMM) is mainly composed of actuator and sound radiator, it become more and more concerned because its soundwave can enhance oil output efficiency and it is very important in science and economy in developing applied and basic research of borehole sound transducer for EOR, for the research of low frequency transducer for EOR is still in initial stage. The project, which focuses on the research and study on the work principle and applied fundamental of transducer for enhancing oil recovery based on GMM, is supported by nature science funding sponsored by nation and province. This dissertation is studying on EOR transducer by means of theory combining with experiment, the main content includes:In chapter 1, background and purport of the dissertation were enucleated, research actuality of technology and transducer in soundwave for EOR was expounded, as well as high power transducer based on GMM, and overall arrangement was presented.In chapter 2, work principle of soundwave for EOR and sound radiation law in oil layer were analyzed, requirement in designing of sound transducer for EOR driven by GMM core element was presented, including construction design, determining principle of resonance frequency and critical sound radiation intension, and so on. Resonance frequency of sound radiator can be decreased with the aid of bending vibration model to respite the contradiction between the low frequency and small dimension of transducer, and energy loss can be decreased in sound radiation in oil layer. It was discussed in the dissertation how to regular the relationship between mechanical qualities and bandwidth of transducer, impedance matching of transducer in difference medium was also discussed, which gave academic foundation for EOR transducer designing based on GMM.In chapter 3, a new-style sound radiator which resembles ellipse sphere was designed. Vibration equation of sound radiator and calculated expressions of parameters were set up, and resonance frequency of sound radiator was analyzed and calculated. The method that how to calculate sound radiator source level was presented, and the relationship between sound radiator source level and power of drivers was deduced, both of which act as academic foundation for designing sound radiator and calculating sound radiation intensity. In chapter 4, integrated system design of the driver based on GMM was completed and theoretical basis for calculating parameters of the drivers were presented; dynamic properties of GMM and the driver were studied, dynamic equation of transducer was set up. Criterion to measure the driving capacity of the driver was presented; energy transfer efficiency of the driver can be enhanced by optimizing pre-pressure stress, magnetic offset and coil designing.In chapter 5, self-sensing mechanism of resonance point of GMM transducer and automatic trace principle of resonance frequency were presented for reducing transducer's volume and achieving collocate control effectively. Self-sensing physical foundation of GMM transducer was analyzed as a bidirectional transducer, according to which self-sensing model including displacement, speed, impedance and force at the end of transducer was set up. Sensing signal was picked up in bridge circuit under the high driving power. The results showed that induction voltage was in direct ratio with speed, frequency or force.In chapter 6, experiment installation based on LabVIEW was built up. The effect of stimulation current frequency and amplitude on dynamic qualities of transducer was studied. The self-sensing method of resonance frequency was proved to be feasible and accurate. The effect of soundwave from sound radiator on increasing infiltration in rocks was discussed.In chapter 7, the central work and innovation points were summarized and the future research was put forward.