Compositions and methods for weighting a breaker coating for uniform distribution in a particulate pack
AssigneeHalliburton Energy Services, Inc.
InventorsBradley L. Todd, B. Raghava Reddy
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Abstract
The present invention involves methods and compositions for treating subterranean formations, and more specifically, relates to improved methods and compositions for degrading filter cake deposited in a subterranean formation by effecting a uniform distribution of a filter cake breaker. One embodiment of the present invention provides a weighted encapsulated breaker comprising a breaker material; and, a coating material comprising a polymer material and a filler material having a specific gravity of at least about 6.5.
Claims36
A method of removing a filter cake comprising the steps of:
- providing a weighted encapsulated breaker comprising a breaker material that is encapsulated in a coating that comprises a polymer material and a filler material having a specific gravity of at least about 6.5;
- placing the weighted encapsulated breaker into a subterranean formation as part of a gravel pack substantially adjacent to a filter cake;
- allowing the breaker material to diffuse from the weighted encapsulated breaker;
- and degrading a portion of the filter cake.
A method of using a portion of a gravel pack to degrade a portion of a filter cake comprising the steps of:
- providing a weighted encapsulated breaker comprising a breaker material that is encapsulated in a coating that comprises a polymer material and a filler material having a specific gravity of at least about 6.5;
- providing a gravel material and a delivery fluid;
- slurrying the weighted encapsulated breaker and gravel into a delivery fluid to create a gravel packing composition;
- introducing the gravel packing composition to a well bore having a filter cake thereon so that a gravel pack is formed substantially adjacent to the filter cake;
- allowing the breaker material to diffuse from the encapsulated breaker;
- and degrading a portion of the filter cake.
A method of placing a gravel pack in a subterranean formation comprising the steps of:
- providing a gravel pack composition comprising a transport fluid, gravel particles, and a weighted encapsulated breaker material wherein the weighted encapsulated breaker material comprises a breaker material and a coating material comprising a polymer material and a filler material having a specific gravity of at least about 6.5;
- and, introducing the gravel pack composition into a well bore so that the gravel particles form a gravel pack substantially adjacent to the well bore.
Dependencies are inferred from the claim text.