Abstract
The paper discusses the problem related to production casing leak repairs in the wells at the sites of PJSC Tatneft. The investigation showed that the most common and frequent problems occurring in the drilling facilities of the company are associated with the Serpukhov-Oka, Famennian and Frasnian stages. It has been found that high fluid loss, or absorption, is the major cause leading to well production string leak. The method of installing a profile liner in the borehole areas with high or complete loss of returns was proposed to prevent production casing string leaks and to improve the string integrity. The new technique involving a profile liner installation contributes considerably to string protection and integrity due to its metal wall thickness and squeeze cementing job quality in the string interval.
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