Estimation of leakoff pressure gradient from cementing and casing data

Document Type

Conference Proceeding

Publication Date

1-1-1999

Abstract

A new procedure for finding safe value of casing shoe leak-off pressure in surface holes in the shallow-marine sediments (SMS) is described. Presented is a theoretical proof, supported by field data from leak-off tests, that, in SMS, annulus channeling outside cement occurs more likely at a pressure values smaller than the rock fracturing pressure. Thus, for upper well sections in SMS the prediction of casing shoe strength should be based on critical conditions for annulus channeling rather than rock fracturing. Finally it is shown that, changes in cementing and drilling practices may increase casing shoe integrity and reduce the need for cement squeeze treatments.

Publication Source (Journal or Book title)

Proceedings - SPE Annual Technical Conference and Exhibition

First Page

747

Last Page

757

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