The Study And Development Of Flexeiable Oil Rod

Mechanical oil pumping is the main way to conventional oil pumping at home and abroad, and oil pumping with pole is the technology used most extensive on world oil pumping trade, the elevation dominate on the oil pumping engineering up to now. The well used mechanical oil pumping hold about 90% to total well and the well used oil pumping with pole hold about 80~85% to well used mechanical oil pumping. At present, there are about 90% wells used oil pumping with pole to whole wells used mechanical oil pumping on land and 80% petroleum pumped by oil pumping with pole, the energy consumption by facilities on oil pumping with pole take up above 30% on total energy consumption, and along with the coming of evening to exploitation, the proportion tend to ascend. But because of the serious condition of oil pumping pole, it has been the most feeble portion in oil pumping with pole that restrict the development as a soft spot on oil pumping method. On statistic, there are 60~75% accidents to the total with the reason such as oil pumping pole's relaxation, drop out and rupture of tie-in parts. In nation many oilfields have little leakages and along with the exploitation from forepart into the late stage and augment on petroleum layer's deepness, energy consumption has been one of the main factors to many oilfields with medium or small output.Author earnestly analyses the use instance for oil pumping pole with bar round section, and think it for the following advantages:A. Simple mechanical equipments on oil pumping systems.B. Simple productive technology on oil pumping pole with bar round section.C. Convenient transportation and easy maintenance. Yet, the oil rod with round steel has the following defect swouldn't be conquered:A. Because that one oil rod with round steel is about 8m, if the wildcat has 1600m deepness, there must have 200 tie-in to connect then it can be installed on the oilfield, so when the pump is into the more depth that meaning more tie-in and adaptor for use. Those tie-in and adaptor regularly drop out on secular cyclical loading, impulsion and vibration force, even breaking.B. Multilevel-piston effect would happen reasoning to so much adaptors then depress efficiency on oil pumping (adaptor's diameter is 2 times to pole's diameter).C. The up and down work of oil rod with round steel is discontinuous meaning long working time and large intensity of labor to worker.General oil rod with round steel has the largest tensile strength on 650MPa ~ 950MPa (35CrMo), thus it can only be used small-pump deep-pumping technology because in the deep wildcat and extra deep wildcat its deadweight is so big, then take place high energy consumption, low efficiency and many drop out and breaking on pole.There are analysis on the oil rod's forces and athletic methods, and think for following:The flexible oil rod has the same athletic method to rigid oil rod used on general oil-pumping equipments. The action near the up and down fixed points of flexible oil-pumping system's plunger is composed by compulsive action follow to hanged point and elastic damped vibration. After some time when the pole's elastic deformation has been ended, the plunger has the same athletic method to rigid pole.The flexible oil rod has the same athletic method to rigid oil rod used on general oil-pumping equipments. The action near the up and down fixed points of flexible oil-pumping system's plunger is composed by compulsive action follow to hanged point and elastic damped vibration. After some time when the pole's elastic deformation has been ended, theplunger has the same athletic method to rigid pole. Two ends would be drawed on the course of oil pumping to flexible pole with the name action of compressing alternative load. Especially on the two ends the generant alternative stress from alternative load presents more serious status.C. To satisfy the requirements for oil pumping, the flexible pole should take on sufficient intensity and rigidity, and the structural stretch must be...