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The Guide to Oilwell Fishing Operations, 2nd Edition by Joe P. DeGeare

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Chapter 10

Washover Operations

Abstract

Washover pipe (or washpipe, as it is commonly called), is large pipe used to drill out, wash out, and circulate out cement, fill, formation, or other debris that is causing the fish to stick. Proper size selection in washover operations is critical. The washpipe’s inside diameter (ID) must be large enough to go over the fish, with clearance for circulation. The outside diameter (OD) must allow rotation in the hole or casing. To avoid sticking the washpipe, its annular clearance must be sufficient for circulation and prevention of overtorquing

Keywords

Backoff connectors

Diamond-dressed washover shoes

Hydraulic clean-out tools

Unlatching joints

Washover operations

Washpipe rotary shoes

Washover pipe ...

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