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New Design of Solid-Expandable Tubular Aids Patching of Hard-To-Reach Casing

Solid-expandable tubular (SET) is widely used to patch casing and has proved to be cost effective; however, when the damage is directly below an area previously patched, conventional expandable tubular might not be positioned smoothly because of a loss in wellbore size caused by the previously installed tubular. A new design involves putting the expansion tool outside the tubular. As a result, the expansion ratio could be maximized and the tubular without launcher could pass through the smaller wellbore.

Innovative Structure Design

SET technology is well known for its classic structure (Fig. 1). The expansion tool is put inside the tubular and pushed upward by hydraulic or mechanical means. Usually, rubber is used to seal the annular space between the casing and the tubular. This structure has great advantages in the field and has been used widely across the world; however, one significant weakness cannot be ignored. While the expansion tool is inside the tubular, it restricts the expansion ratio. Therefore, this structure is not appropriate for handling some difficult issues. The most common issue is that the casing often needs to be patched more than once. Usually, the patch position is directly below the previously installed SET, making it almost impossible for the conventional patching tool to be delivered in position. The new design was developed to meet this challenge (Fig. 2).

This article, written by Editorial Manager Adam Wilson, contains highlights of paper IPTC 16429, “Innovative Design of the Solid-Expandable Tubular To Patch the Casing: Area Below the Previously Installed Expandable Tubular,” by Tao Li, Shan Gao, Qiang Chen, Yiliang Li, Weiye Han, Xiuling Bi, and Qiang Sun, PetroChina, prepared for the 2013 International Petroleum Technology Conference, Beijing, 26–28 March. The paper has not been peer reviewed. Copyright 2013 International Petroleum Technology Conference. Reproduced by permission.
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New Design of Solid-Expandable Tubular Aids Patching of Hard-To-Reach Casing

01 June 2013

Volume: 65 | Issue: 6

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