To meet the demands of direct-drive petroleum equipment, developed a low-speed and high-torque permanent magnet synchronous motor. By analyzing and identifying the suitable key parameters such as permanent magnet structure parameters, air gap length, type and size of Stator Slot and so on, designed permanent magnet synchronous motor with the torque 10800 Nm, the rated speed 30 r/min and high efficiency and power factor. Obtained the flux density distribution situation and characteristic curves under no-load working condition through simulation and analysis. Manufactured the low-speed and high-torque permanent magnet synchronous motor and applied it to pumping unit. Test results show that this motor has many advantages such as wide range of speed regulation, small torque ripple, smooth operation and other characteristics. The Direct-drive Pumping Unit used this permanent magnet synchronous motor can save 20% energy than the beam pumping unit, so its social and economic benefits are significant.
Combined with features of flexible multi-body drilling string system and top-drive drilling system, the characteristic equation for lateral, twisting and longitudinal coupled vibration of flexible multi-body drilling string system is developed based on elastic vibration theory and finite element method, and the lateral vibration constraints is restored. Within 1700m vertical borehole, the relationship between the intrinsic frequency of flexible multi-body drilling string system and axial load, static drilling pressure, mud, length of drill collars, length of drill pipes are gained by analyzing the lateral vibration, twisting vibration and longitudinal fluid-structure vibration of flexible multi-body drilling string system by using software ANSYS. One to five step intrinsic frequencies of flexible multi-body drilling string system are gained. The research is about the theoretical basis for Well bore control theory of top drive drilling.
According to the present situation of the torque measurement for large motor in active oilfield (the rotation speed of the electrical motor amount to 2980 r/min, clamping space is limit and measured shaft is not allowed to be detached when being measured), on-line test method of large motor in active oilfield service was studied, and torque measuring scheme based on telemeter strain style was put forward, furthermore the transmitter and receiver of torque telemeter system was selected and clamping apparatus was designed. The result of experiment shows that the method can complete on-line torque test for large motor without demounting the motor, the test result is reliable and error rate below five percent.
The sub-frame of 2500HP fracturing truck is an important component, which connects to chassis with the vehicle equipment. Because the sub-frame bears tension, torsion and bending loads, enough rigidity and intensity are necessary for chassis. Based on the Pro/E software, the 3-D model of frame and sub-frame was constructed. Using topology optimization method, layout of the sub-frame was determined and location of crossbeams was arranged. Meanwhile, number and location of the connectors between main frame and sub-frame was analyzed, analysis result shows that carrying capacity of chassis can be enhanced without increasing connectors number of main frame and sub-frame. Some available reference can be provided for chassis manufacture
Subsea wellhead for deepwater production subjects to axial force, lateral force and bending moment under the seismic loading, the effect of subsea christmas tree and casing string’s gravity. Joint action of these forces makes it is possible that horizontal displacement exceeds the limitation and thus loses the stability. A mechanical analytical model of subsea wellhead for deepwater production is established on the basis of the pile foundation theories and material mechanics, the seismic load and behavior between casing string and formation are considered. The analyses on lateral displacement, angular distortion, bending moment and shear force show that the affection of lateral load is focus on the upper section of casing string, and the lateral displacement of subsea wellhead for deepwater production increases along with earthquake load and thus decreases stability. The stability improves notably with the increase of coefficient of soil reaction. Therefore it is necessary to obtain the on-the-spot geological data in shallow formation. The wellhead stability may be improved to different degrees by taking measures such as minimizing axial load, enhancing the conductor bending strenth, increasing the depth of the casing string in soil, reducing the outcropping length of the casing string.
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