SURFACTANT ADDITIVES USED TO RETAIN PRODUCIBILITY WHILE DRILLING

摘要

The present invention relates to a method, wherein the method comprises providing a drilling fluid comprising: an aqueous fluid, a microemulsion surfactant and optionally a non- polar fluid; and drilling a well bore in a subterranean formation comprising an oleaginous fluid or a pore throat or both using the drilling fluid, wherein the microemulsion surfactant forms a microemulsion with the oleaginous fluid within the well bore or wherein the microemulsion surfactant forms a microemulsion with at least the non-polar fluid. Optionally, the method comprises providing a drilling fluid comprising an aqueous base fluid and a microemulsion surfactant; and drilling a well bore in a subterranean formation that comprises a pore throat; and allowing the surfactant to remove an oil block, a water block, or both from the pore throat. In accordance with the method, the subterranean formation may have a retained producibility greater than about 50%.