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AssigneeHalliburton Energy Services, Inc.
InventorsBradley L. Todd, B. Raghava Reddy, James V. Fisk, Jr., James D. Kercheville
Estimating the term…
Well drilling and servicing fluids for use in producing formations and methods of removing filter cake therefrom are provided. The methods basically comprise using a drilling or servicing fluid comprised of water, a density increasing water soluble salt, a fluid loss control agent, a hydratable polymer solid suspending agent and a particulate solid bridging agent which is soluble in an aqueous ammonium salt solution. Thereafter, the filter cake deposited by the drilling or servicing fluid is contacted with a clean-up solution comprised of water and an ammonium salt for a period of time such that the bridging agent is dissolved thereby.
A method of removing filter cake from the walls of a well bore penetrating a producing formation deposited therein by a drilling or servicing fluid comprised of water, a density increasing water soluble salt and a particulate solid bridging agent comprising the steps of:
A method of removing filter cake from the walls of a well bore penetrating a producing formation deposited therein by a drilling or servicing fluid comprising the steps of:
Dependencies are inferred from the claim text.