OPTIMUM DESIGN OF CASING CENTRALIZING IN CEMENTING

The desisn of casing strings centralizing is to determine position and pace of casing centralizers in cementing. Precious design considered one section of casing strings only without considering interaction of adjacent sections and made so many assumptions on geometric configuration of borehole that degree of centralization of casing string was described inaccurately. As a result, it is impossible to optimize the locations and pace of casing and to get knowledge of eccentric condition of casing strings in borehole. This paper presents a mechanic model for optimum designing without any assumptions of borehole,so that the eccentric condition and centralizing rate of casing can be gotten accurately by analyzing the deformations of casing strings integrally.