| 摘要 |
<p>A water-based drilling fluid (WBM) comprises as additive one or more polyalkylene glycols or alcohol alkoxylates including butylene oxide monomer. Three typical additive molecules suitable for use in the drilling fluid of the invention are: HO(EO)8(BO)3H, HO(EO)7(PO)2(BO)2H, RO(EO)5(BO)2H, where R = C4H9. Drilling fluids in accordance with the invention have been found in laboratory tests to exhibit improved shale inhibition properties as compared with known polyol containing WBM, particularly in the absence of added potassium ions. This is environmentally advantageous.</p> |
