Eccentric wear prevention method for pumping well with pole

Abstract

The invention discloses an eccentric wear prevention method for a rod pumping well in the technical field of oil production by sucker rod pump. From the aspect of the research of three-dimensional well bore trace and the motion trace of a sucker rod, a mechanics theory model of the sucker rod in the three-dimensional well bore is established; through the actual measurement of parameters of pulling, pressing, twisting, temperature, acceleration and the like of a certain point of the sucker rod string, necessary boundary conditions are provided to the mechanics analysis model of the three-dimensional sucker rod and rod string mechanics analysis parameters, the stress status of various levels of the sucker rod and the eccentric wear condition of the eccentric wear under actual well conditions are obtained through an analysis software of the three-dimensional sucker rod; and a hollow embedded weighted lever, an eccentric wear prevention collar and other eccentric wear prevention technique are adopted to reduce the eccentric wear points and the rod string and improve the abrasion performance of the eccentric wear points. The invention provides technical support for the optimization of the combination of rods and pumps and the eccentric wear, breaking and casting prevention of the sucker rod and the diagnosis of the oil well through the construction of the mechanics model close to the actual production and forms a set of targeted and pragmatic comprehensive eccentric wear prevention design method for the sucker rod string.

Description

technical field [0001] The invention relates to the field of rod pump oil production in oil fields, in particular to a design method for preventing partial wear of rod pumping wells. Background technique [0002] The rod pumping lifting method has the advantages of low cost, simple management and maintenance, and wide application range, so it has always occupied a dominant position in various oil fields in my country. During the rod pump pumping process, the sucker rod and the tubing are prone to eccentric wear, especially in wells with complex well trajectory such as directional deviated wells and special structure wells, the phenomenon of eccentric wear of the pipe and rod is more serious, and often occurs. The situation of sucker rod wear and tubing wear-through, on the one hand, increases the cost of oil well pump inspection operations; on the other hand, it affects the normal production of oil wells and causes production loss. [0003] Aiming at the eccentric wear prob...

AI Technical Summary

Problems solved by technology

Although most rod system optimization design software considers the three-dimensional characteristics of the wellbore trajectory, there are still great deficiencies in the boundary conditions and design methods. It stays in theoretical modeling and theoretical calculations, and only the surface dynamometer diagram and oil pumping The trajectory of the machine is used as the boundary condition, and the actual downhole test data is lacking, so it is difficult to calculate the complex influencing factors downhole, especially in the combination of the anti-eccentric wear tool and software, and the actual application is quite different.

In field application, pump inspection operation wells caused by eccentric wear remain high