Self-cleaning well control fluid

Details Self-cleaning well control fluid Self-cleaning well control fluid

C - Chemistry, Metallurgy

09

K

C09K 8/44 (2006.01) C09K 8/524 (2006.01) C09K 8/536 (2006.01) E21B 33/138 (2006.01) E21B 37/06 (2006.01) C09K 8/76 (2006.01) E21B 43/27 (2006.01)

Patent

CA 2582275

A composition and method is given for a well control fluid that is injected into a well during completion or remediation and prevents fluid flow from a formation into the well during operations (such as shut-in, or placement or adjustment of tools/hardware) when no fluid flow is desired. The composition includes a viscoelastic surfactant fluid system (VES) and a decomposable first solid material, preferably in fiber form, that forms a pack or plug in the well at the location where fluid would otherwise leak off, and then decomposes without intervention to release a product that is a breaker for the surfactant or the micelles of the VES. The composition optionally also contains a pH control agent and a second solid (that may also be a fluid loss agent) that affect the decomposition of the first solid.

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