Method for Intervention Operations in Subsurface Hydrocarbon Formations
Methods are provided for improved intervention processes in a well. Nanoparticles are added to a fluid containing a wetting agent to enhance wetting of solid surfaces in and around the well, leading to improved flow capacity of the well.
1 . A method for improving oil, gas, and water recovery from a hydrocarbon reservoir or well comprising:
injecting into the reservoir or well nanoparticles in the range of 1-100 nanometers, the particles having been combined with a wetting agent in aqueous or hydrocarbon carrier fluid.
2 . The method of claim 1 wherein the wetting agent is selected from the group consisting of ethoxylated nonyl phenol, sodium stearate, sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, lauralamine hydrochloride, trimethyl dodecylammonium chloride, cetyl trimethylammonium chloride, polyoxyethylene alcohol, alkyphenolethoxylate, Polysorbate 80, propylene oxide modified polymethylsiloxane, dodecyl betaine, lauramidopropyl betaine, cocoamido-2-hydroxy-propyl sulfobetaine, alkyl aryl sulfonate, fluorosurfactants and perfluoropolymers and terpolymers, and castor bean adducts.
3 . The method of claim 1 wherein the nanoparticles are in the range of 1-10 nanometers in size.
4 . The method for claim 1 wherein the nanoparticle concentration is between 0.5% and 20% in the aqueous or hydrocarbon carrier fluid.
5 . The method of claim 1 wherein the nanoparticle concentration is in the range from approximately 0.01% to approx. 15% by volume.
6 . The method of claim 5 wherein the nanoparticles are added to the carrier fluid as a dispersion at concentrations of approximately 0.1% to approximately 50% by volume.
7 . A well treatment fluid comprising;
nanoparticles in the range of approximately 1 to approximately 100 nanometer size; and
a wetting agent in an aqueous or hydrocarbon carrier fluid.
8 . The treatment fluid of claim 7 , wherein the wetting agent is selected from the group consisting of ethoxylated nonyl phenol, sodium stearate, sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, lauralamine hydrochloride, trimethyl dodecylammonium chloride, cetyl trimethylammonium chloride, polyoxyethylene alcohol, alkyphenolethoxylate, Polysorbate 80, propylene oxide modified polymethylsiloxane, dodecyl betaine, lauramidopropyl betaine, cocoamido-2-hydroxy-propyl sulfobetaine, alkyl aryl sulfonate, fluorosurfactants and perfluoropolymers and terpolymers, and castor bean adducts.
9 . The treatment fluid of claim 7 wherein the nanoparticles are dispersed in the wetting agent and carrier fluid in the range of approximately 0.05% to approximately 30% by volume of said carrier fluid.
10 . The treatment fluid of claim 7 wherein the nanoparticles are selected from the group consisting of silicon dioxide, zirconium dioxide, antimony dioxide, and combinations thereof.
11 . A method for removal of paraffin or heavy hydrocarbon deposits in or around a well so as to increase flow rate of the well comprising:
providing an aqueous fluid;
adding additives comprising nanoparticles and a wetting agent to the aqueous fluid;
injecting the aqueous fluid and additives into the well; and
producing a fluid from the well.
12 . The method of claim 11 further comprising the step of allowing a selected time for contact of the aqueous fluid in or around the well before producing the fluid from the well.
13 . The method of claim 11 further comprising adding a solvent to the aqueous fluid and additives before injecting the aqueous fluid and additives into the well.
14 . The method of claim 13 wherein the solvent is a terpene or aromatic hydrocarbon.
15 . The method of claim 14 wherein the terpene is d-limonene.
16 . The method of claim 13 wherein the aromatic hydrocarbon is xylene or toluene.
17 . The method of claim 11 wherein the wetting agent is an alpha-olefin sulfonate.
18 . The method of claim 17 wherein the alpha-olefin sulfonate has a carbon number in the range from about 10 to about 14.
19 . The method of claim 11 wherein the nanoparticles are added to a concentration in the range from about 5% to about 15% by weight.
20 . A method for removal of water block around a well, comprising:
providing an aqueous fluid;
adding nanoparticles and a surfactant to the aqueous fluid;
injecting the fluid and additives into the well; and
producing a fluid from the well.
21 . The method of claim 20 wherein the wetting agent is an alpha-olefin sulfonate.
22 . The method of claim 20 wherein the alpha-olefin sulfonate has a carbon number in the range from about 10 to about 14.
23 . The method of claim 20 wherein the nanoparticles are added to a concentration in the range from about 5% to about 15% by weight.
24 . A method for acidizing a carbonate reservoir comprising:
providing an aqueous fluid;
adding nanoparticles and wetting agent to the aqueous fluid to form a nanoparticle treating solution;
pumping the treating solution down a well and into the reservoir;
pumping an acid solution down the well;
pumping the nanoparticle treating solution down the well; and
producing fluids from the well.
25 . The method of claim 24 wherein the wetting agent is an alpha-olefin sulfonate.
26 . The method of claim 24 wherein the alpha-olefin sulfonate has a carbon number in the range from about 10 to about 14.
27 . The method of claim 24 wherein the nanoparticles are added to the nanoparticle treating solution to a concentration in the range from about 5% to about 15% by weight.
28 . A method for hydraulic fracturing of a well comprising:
providing an aqueous fluid;
adding nanoparticles and wetting agent to the aqueous fluid to form a nanoparticle treating solution; and
pumping the nanoparticle treating solution into the well at a pressure greater than pressure required to hydraulically fracture the well.
29 . The method of claim 28 wherein the nanoparticle treating solution is pumped into the well as a part of a pad fluid.
30 . The method of claim 28 wherein the nanoparticle treating solution is pumped into the well after the proppant-laden stage and before producing the well;