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AssigneeSchlumberger Technology Corporation
InventorsMehmet Parlar, Colin J. Price-Smith, Raymond J. Tibbles, Shrihari Kelkar, Mark E. Brady, Elizabeth W. A. Morris
Estimating the term…
A method of gravel packing a wellbore which has at least one aperture therein that provides a fluid flow path between the wellbore and an adjacent subterranean formation. At least a part of the formation adjacent to the open hole has a filter cake coated thereon that comprises a water and oil emulsion. The method of gravel packing comprises injecting into the wellbore a gravel pack composition that comprises gravel and a carrier fluid. The carrier fluid comprises an aqueous liquid having a pH that is outside the range at which the filter cake emulsion is stable. The aqueous liquid is present in an amount effective to invert the water in oil emulsion in the filter cake when the carrier fluid comes into contact with the filter cake. As a result, gravel is deposited at or adjacent to the aperture in the wellbore and some of the filter cake is removed. The remainder of the filter cake and the carrier fluid can be broken simultaneously by contact with a breaker fluid that contains at least one of a surfactant and a mutual solvent.
A method of gravel packing a hole in a subterranean formation, a part of the formation adjacent to the hole having a filter cake coated thereon, said filter cake comprising an oil-external emulsion, said method comprising the step of injecting into the hole a gravel pack composition comprising gravel and a carrier fluid comprising an aqueous phase and further comprising the step of breaking or inverting the filter cake emulsion.
A method of simultaneously gravel packing an open hole of a wellbore and removing filter cake from a subterranean formation adjacent to the open hole, the filter cake comprising a water in oil emulsion that is stable at pH greater than about 8;
A method of simultaneously gravel packing an open hole of a wellbore and removing filter cake from a subterranean formation adjacent to the open hole, the wellbore having been drilled at least in part with an oil based drilling fluid, the filter cake comprising a water in oil emulsion that is stable in a first pH range;
Dependencies are inferred from the claim text.