Tension-adjustment dual-roller-set correction packing box

Abstract

A tension-adjustment dual-roller-set correction packing box adopts design which comprises rubber packing of a mirrored symmetric sealing face structure, built-in dual roller sets and a bulb steering structure. The packing box comprises a packing box main body, the rubber packing, an upper press cover, a lower connector, a bulb connector, an annular clamp, a lower press cover, a first roller set and a second roller set, wherein forced centering correction is conducted by an oil production polish rod, so sealing effects between the oil production polish rod and the rubber packing are improved; by the bulb steering structure between an upper connector and the bulb connector, elastic tension of the oil production polish rod is adjusted in a circulative manner, so generation of friction hard points is avoided, and damage in surface smoothness of the oil production polish rod and wear of the rubber packing are relieved; when the packing box is applied to oil production, centering accuracy ofthe oil production polish rod can be increased, and sealing effects can be improved; and in addition, the service life of the oil production polish rod is prolonged, friction strength and fatigue damage of the packing are reduced, consumption of oil production is reduced, hidden dangers in safety production are eliminated, cost of oil production is saved, and production efficiency of oil production is increased.

Description

technical field [0001] The invention relates to a packing box, in particular to a tension-adjusting double-roller group deviation-correcting packing box. Background technique [0002] The packing box is one of the key components of the Christmas tree of the mechanical oil production well. By filling the packing sealing material in the box body, the oil production polished rod is sealed to prevent oil and water leakage during the oil production process. At present, in the production of oilfields, the phenomenon of oil leakage from packing boxes is still relatively common. The reasons for this unfavorable phenomenon are not only the construction accuracy of the Christmas tree, the quality of packing sealing materials, etc. The impact of chemical properties, but more importantly, the inability of the polished rod to be accurately centered is one of the main reasons why the oil leakage of the packing box cannot be fundamentally resolved. In the working state, because the donkey...

AI Technical Summary

Problems solved by technology

At present, in the production of oilfields, the phenomenon of oil leakage from packing boxes is still relatively common. The reasons for this unfavorable phenomenon are not only the construction accuracy of the Christmas tree, the quality of packing sealing materials, etc. The impact of chemical properties, but more importantly, the inability of the polished rod to be accurately centered is one of the main reasons why the oil leakage of the packing box cannot be fundamentally solved

In the working state, because the donkey head of the oil field production tree is generally difficult to maintain a precise vertical trajectory, the oil production polished rod has a certain degree of radial swing during the upward and downward process, and cannot always keep aligned with the packing box. At the center position, there is eccentric wear between the oil production polished rod and the packing sealing material, and the packing will wear the oil production polished rod, thereby reducing the sealing effect and causing oil and water leakage

Although the packing boxes used in the current production have a certain deflection adjustment function, when the deflection amount is large, the forced limit restricts the radial swing movement of the oil production rod, which inevitably causes elastic tension and damage to the oil production rod. Accompanied by a certain elastic deformation, the existence of this elastic tension and deformation will cause the packing box to form local frictional hard points, which will increase the friction intensity, resulting in damage to the surface finish of the polished rod in this area and wear of the packing material, not only The problem of oil and water leakage in the packing box cannot be solved, and it is necessary to stop the well frequently to replace the polished rod and replace the packing material frequently, which still has the problems of high cost consumption, high labor intensity, heavy environmental pollution, low operating efficiency and high production cost

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