Alkyl ester spotting fluid compositions for differential sticking
AssigneeSaudi Arabian Oil Company
InventorMd Amanullah
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Abstract
Alkyl ester spotting fluid compositions and processes for freeing differentially stuck pipe are provided. An alkyl ester spotting fluid composition includes an invert emulsion having an alkyl ester as the external phase and water as the internal phase. In some embodiments, the alkyl ester spotting fluid composition may include the alkyl ester invert emulsion and an emulsifier. The alkyl ester spotting fluid composition may be introduced downhole in the vicinity of a portion of a differentially stuck pipe such that the spotting fluid composition contacts the mudcake and frees the differentially stuck pipe.
Claims8
A spotting fluid composition for freeing differentially stuck pipe in a well, the spotting fluid composition comprising:
- an emulsifier;
- an invert emulsion including:
- an external phase comprising an alkyl ester produced from the esterification of a vegetable oil;
- and
- an internal phase comprising water.
The spotting fluid composition of claim 1, comprising a weighting agent. The spotting fluid composition of claim 8, wherein the weighting agent comprises at least one of barite, calcium carbonate, and hausmannite ore.
Dependencies are inferred from the claim text.