Multifunctional nanoparticles for downhole formation treatments
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A subterranean formation, granular additive technology used in wellbore/well components, production fluids, sealing/packing, etc.
Active Publication Date: 2010-02-10
BAKER HUGHES INC
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However, they noted that clay particles can become oil-wet or partially oil-wet due to external influences, and thus fines and clay particles may be attracted to and submerged in the oil phase
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[0063] Experiments with laboratory gravel packs (20 / 40 mesh) with and without nanoparticles in VES fluids demonstrated that gravel packs containing nanoparticles can dissociate after the viscosity of the VES gel fluid breaks and flows out of the pack. Formation fines are fixed in the gravel pack. The base fluid used was water containing 4v / v% WG-3L VES, 7wt% KCl and 3v / v% fish oil internal breaker (Fish Oil 18:12 from Biooriginal Food & Science Corp.). The brine was gelled with VES and mixed with 20 / 40 mesh (425 / 850 microns) gravel and viscosity broken with an internal breaker. In Example 1, no nanoparticles were added, and in Example 2, 20pptg (2.4kg / m 3 ) nanoparticles. After breaking the fracturing fluid, inject the mixture into a 1 inch ID (2.5 cm) acrylic tube with a 100 mesh (150 micron) screen at the bottom of the tube to allow the broken fluid to flow out of the tube and retain the grit The filling is in the tube. The acrylic tube has a 0.125 inch (3 mm) exit hole ...
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Abstract
An aqueous, viscoelastic fluid gelled with a viscoelastic surfactant (VES) is stabilized and improved with an effective amount of an alkaline earth metal oxide alkaline earth metal hydroxide, alkali metal oxides, alkali metal hydroxides transition metal oxides, transition metal hydroxides, post-transition metal oxides, and post-transition metal hydroxides. These fluids are more stable and have a reduced or no tendency to precipitate, particularly at elevated temperatures, and may also help control fluid loss. When the particle size of the magnesium oxide or other particulate agent is a nanometer scale, for instance having a mean particle size of 100 nm or less, that scale may provide unique particle charges that use chemisorption, ''crosslinking'' and / or other chemistries to associate and stabilize the VES fluids, and also help trap or fixate formation fines when deposited into a proppant pack in a fracture.
Description
[0001] Cross References to Related Applications [0001] This application is U.S. Serial No. 11 / 931,501 filed October 31, 2007; U.S. Serial No. 11 / 931,706 filed October 31, 2007; U.S. Serial No. 11 / 679,018 filed February 26, 2007 and a continuation-in-part of U.S. Serial No. 11 / 849,820, filed September 4, 2007, which claimed the benefit of U.S. Provisional Patent Application 60 / 845,916, filed September 20, 2006, and in turn, May 2005 Continuation-in-Part of U.S. Serial No. 11 / 125,465 filed on the 10th, which in turn claims the benefit of U.S. Provisional Patent Application 60 / 570,601, filed May 13, 2004, and is a May 2007 A continuation-in-part of US Serial No. 11 / 755,581 filed on the 30th, which in turn claims the benefit of US Provisional Patent Application 60 / 815,693, filed June 22, 2006. technical field [0002] The present invention relates to aqueous viscoelastic fluids used during hydrocarbon recovery operations, and more particularly, in one non-limiting embodiment, t...
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