CA2847947A1 - Petroleum resin anti-accretion additives, drilling fluid compositions and methods of use thereof - Google Patents
Petroleum resin anti-accretion additives, drilling fluid compositions and methods of use thereof Download PDFInfo
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Abstract
A petroleum resin is useful as an oil sand anti-accretion additive for drilling fluids to limit accretion of oil sands on metal surfaces. The petroleum resin may be employed in drilling fluids and methods for wellbore drilling, limiting accretion during drilling and for removing heavy oil from a drilling fluid.
Description
ANTI-ACCRETION ADDITIVES, DRILLING FLUID COMPOSITIONS AND
METHODS OF USE THEREOF
FIELD OF INVENTION
The invention relates to drilling fluids, drilling fluid additives and methods and, in particular, to drilling fluids, drilling fluid additives and methods useful for handling drilling fluids and for drilling oil wells through formations containing heavy oil where it is useful to limit heavy oil accretion on metal surfaces.
BACKGROUND OF THE INVENTION
A significant portion of heavy oil deposits are found in unconsolidated formations, such as unconsolidated sand. The mixture of heavy oil in sand is often referred to as oil sands. For the purposes of this description, the terms heavy oil, bitumen and bituminous material may be used interchangeably.
When drilling through oil sands, accretion (or sticking) of the heavy oil drill cuttings to the drill-string, bottom hole assembly or surface handling and solids control equipment may occur. This accretion may particularly occur when drilling a build or a horizontal section. Such accretion deposits impair the drilling operations and removal of said deposits may be required for continued drilling. Removal of the bituminous material from the drilling equipment can in some instances be achieved mechanically; however this requires halting of the drilling operations with the consequent decrease in productivity. A more economical solution to the problem of accretion may be the addition of certain chemicals to the aqueous-based drilling fluid that act to limit or possibly completely eliminate the accumulation of bitumen on drill components. The patent literature refers to several additives that act as anti-accretion additives: see, for example:
US Patent Applications 2012/0285745, 2012/0283149, 2011/0306524, 2010/0298173, 2011/0224108, 2009/0099046, US Patents 7,989,399, 7,879,768, 7,332,458, 7,081,438 and Canadian Patent Application 2719610.
wsLegai\049190\00055\ iononivi A desirable anti-accretion additive may improve heavy oil drilling operations by preventing the accretion of heavy oil to metal surfaces and preserving or increasing the heavy oil-mineral aggregate bond. A further desirable property of the anti-accretion additive is to prevent the dispersion of the heavy oil into the drilling fluid. Many of the above patents succeed in preventing heavy oil accretion, but do not prevent contamination of the drilling fluid with heavy oil.
SUMMARY OF THE INVENTION
Thus, in accordance with a broad aspect of the present invention, there is provided an oil sand anti-accretion additive for drilling fluids to limit accretion of oil sands on metal surfaces comprising: a petroleum resin.
In a further embodiment of the present invention there is provided an aqueous drilling fluid for heavy oil formations, the aqueous drilling fluid comprising: an effective amount of a petroleum resin for limiting oil sand accretion.
In accordance with another broad aspect of the present invention, there is provided a method for drilling a wellbore into an oil sand containing formation, the method comprising: operating a drilling assembly to drill a wellbore into an oil sand containing formation;
and, circulating an aqueous-based drilling fluid through the wellbore as it is drilled, the aqueous-based drilling fluid including an oil sand anti-accretion additive including a petroleum resin.
There is also provided a method for minimizing accretion during a wellbore drilling operation, the method comprising: circulating an aqueous-based drilling fluid through the wellbore as it is drilled, the aqueous-based drilling fluid including an oil sand anti-accretion additive including a petroleum resin.
In accordance with another broad aspect of the present invention, there is provided a method for removing heavy oil from a drilling fluid comprising: adding a petroleum resin in an effective amount to bind at least some free oil present in the drilling fluid.
WSLega1\049190\00055\ 10110111v1
METHODS OF USE THEREOF
FIELD OF INVENTION
The invention relates to drilling fluids, drilling fluid additives and methods and, in particular, to drilling fluids, drilling fluid additives and methods useful for handling drilling fluids and for drilling oil wells through formations containing heavy oil where it is useful to limit heavy oil accretion on metal surfaces.
BACKGROUND OF THE INVENTION
A significant portion of heavy oil deposits are found in unconsolidated formations, such as unconsolidated sand. The mixture of heavy oil in sand is often referred to as oil sands. For the purposes of this description, the terms heavy oil, bitumen and bituminous material may be used interchangeably.
When drilling through oil sands, accretion (or sticking) of the heavy oil drill cuttings to the drill-string, bottom hole assembly or surface handling and solids control equipment may occur. This accretion may particularly occur when drilling a build or a horizontal section. Such accretion deposits impair the drilling operations and removal of said deposits may be required for continued drilling. Removal of the bituminous material from the drilling equipment can in some instances be achieved mechanically; however this requires halting of the drilling operations with the consequent decrease in productivity. A more economical solution to the problem of accretion may be the addition of certain chemicals to the aqueous-based drilling fluid that act to limit or possibly completely eliminate the accumulation of bitumen on drill components. The patent literature refers to several additives that act as anti-accretion additives: see, for example:
US Patent Applications 2012/0285745, 2012/0283149, 2011/0306524, 2010/0298173, 2011/0224108, 2009/0099046, US Patents 7,989,399, 7,879,768, 7,332,458, 7,081,438 and Canadian Patent Application 2719610.
wsLegai\049190\00055\ iononivi A desirable anti-accretion additive may improve heavy oil drilling operations by preventing the accretion of heavy oil to metal surfaces and preserving or increasing the heavy oil-mineral aggregate bond. A further desirable property of the anti-accretion additive is to prevent the dispersion of the heavy oil into the drilling fluid. Many of the above patents succeed in preventing heavy oil accretion, but do not prevent contamination of the drilling fluid with heavy oil.
SUMMARY OF THE INVENTION
Thus, in accordance with a broad aspect of the present invention, there is provided an oil sand anti-accretion additive for drilling fluids to limit accretion of oil sands on metal surfaces comprising: a petroleum resin.
In a further embodiment of the present invention there is provided an aqueous drilling fluid for heavy oil formations, the aqueous drilling fluid comprising: an effective amount of a petroleum resin for limiting oil sand accretion.
In accordance with another broad aspect of the present invention, there is provided a method for drilling a wellbore into an oil sand containing formation, the method comprising: operating a drilling assembly to drill a wellbore into an oil sand containing formation;
and, circulating an aqueous-based drilling fluid through the wellbore as it is drilled, the aqueous-based drilling fluid including an oil sand anti-accretion additive including a petroleum resin.
There is also provided a method for minimizing accretion during a wellbore drilling operation, the method comprising: circulating an aqueous-based drilling fluid through the wellbore as it is drilled, the aqueous-based drilling fluid including an oil sand anti-accretion additive including a petroleum resin.
In accordance with another broad aspect of the present invention, there is provided a method for removing heavy oil from a drilling fluid comprising: adding a petroleum resin in an effective amount to bind at least some free oil present in the drilling fluid.
WSLega1\049190\00055\ 10110111v1
2 It is to be understood that other aspects of the present invention will become readily apparent to those skilled in the art from the following detailed description, wherein various embodiments of the invention are shown and described by way of illustration. As will be realized, the invention is capable for other and different embodiments and its several details are capable of modification in various other respects. Accordingly the detailed description and examples therein are to be regarded as illustrative in nature and not as restrictive.
DESCRIPTION OF THE FIGURES
For a better appreciation of the invention, the following Figures are appended:
Figures 1 to 3 are photos of a drilling fluid, a steel sleeve and solids, respectively from the petroleum resin-treated system of Example 4.
DETAILED DESCRIPTION
The detailed description set forth below is intended as a description of the present invention and is not intended to represent the only embodiments contemplated by the inventor. The detailed description includes specific details for the purposes of providing a comprehensive understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
The present invention provides an anti-accretion additive that may be useful to limit accretions on metal surfaces and that remove oil from systems that are contaminated with dispersed heavy oil. In this application, the term "limit" has been used to mean, in its broadest sense, a reduction or removal of accretions using the present additive in comparison to the reduction or removal of accretions using non-additive containing fluids. The chemicals that are useful in the present invention as an anti-accretion additive are petroleum resins. A petroleum resin is an organic compound obtained from a petroleum feedstock. A petroleum resin is generally:
(i) a reaction product of low molecular weight streams that are separated from crude oil by distillation; (ii) carbon rich, for example with a carbon-to-hydrogen ratio greater than 1:2 and may be identified Waegal\049190\00055\ 10110111v1
DESCRIPTION OF THE FIGURES
For a better appreciation of the invention, the following Figures are appended:
Figures 1 to 3 are photos of a drilling fluid, a steel sleeve and solids, respectively from the petroleum resin-treated system of Example 4.
DETAILED DESCRIPTION
The detailed description set forth below is intended as a description of the present invention and is not intended to represent the only embodiments contemplated by the inventor. The detailed description includes specific details for the purposes of providing a comprehensive understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
The present invention provides an anti-accretion additive that may be useful to limit accretions on metal surfaces and that remove oil from systems that are contaminated with dispersed heavy oil. In this application, the term "limit" has been used to mean, in its broadest sense, a reduction or removal of accretions using the present additive in comparison to the reduction or removal of accretions using non-additive containing fluids. The chemicals that are useful in the present invention as an anti-accretion additive are petroleum resins. A petroleum resin is an organic compound obtained from a petroleum feedstock. A petroleum resin is generally:
(i) a reaction product of low molecular weight streams that are separated from crude oil by distillation; (ii) carbon rich, for example with a carbon-to-hydrogen ratio greater than 1:2 and may be identified Waegal\049190\00055\ 10110111v1
3 as having an iodine number of greater than 50 and possibly greater than 90 (i.e. an iodine number of 50 to 200 or 90 to 150 is typical); (iii) substantially free of heteroatoms such as oxygen, sulfur, nitrogen, chlorine, silicon, phosphorous, etc.; (iv) substantially lipophilic and, (v) substantially solid at the temperatures to which the drilling fluid will be raised when drilling (i.e. based, for example, on the formation temperature).
Petroleum resins may be useful in the present invention as an effective additive when applied in aqueous systems that may limit oil sand accretion on metal surfaces exposed to oil sand-containing formations. The additives may have little tendancy to foam, a property which is beneficial for drilling operations.
Suitable petroleum resins include resins such as CAS#'s: 1271730-19-8, 944329-47-9, 934735-69-0, 308069-21-8, 152443-70-4, 64742-16-1, 64365-14-6, 63393-89-5, 63231-62-9, 9078-59-5, 53025-25-5, 53569-34-9, 63748-37-8, 86472-74-4, 136752-34-6, 172672-18-3, 199195-43-2, 313070-88-1, 877993-94-7 or 1271729-38-4. These petroleum resins are categorized as hydrocarbon resins from petroleum feedstocks, petroleum hydrocarbon resins, aliphatic hydrocarbon resins from petroleum or petroleum aromatic hydrocarbon resins and are available, for example, from chemical suppliers such as Neville Chemical and Eastman Chemicals. For example, some petroleum resins of interest are available from Neville Chemical under the trade marks NevtacTM, NevchemTM and LX- TM.
The petroleum resin is suitable for use in drilling fluid if it can be dispersed therein. For use during a drilling operation, for avoiding accretion downhole, the resin may be sized for circulation in the drilling fluid. Generally, therefore, the resin is suitable for use when having a particle size of less than 500 microns or less than 200 microns. For convenience, the resin may be ground to a particle size of 1 to 200 microns.
Without being limited by theory, it is believed that the petroleum resin combines with the heavy oil arising from the oil sand and forms a solid or highly viscous liquid that does not have the tacky properties normally associated with the heavy oil.
The anti-accretion additives of the present invention can be employed in drilling fluids in an amount dependent on the amount of oil expected to be present in the drilling fluid. Generally, the additive is generally employed at concentrations of at least 0.2% by weight of the drilling WSLega1\049190\00055\ 10110111v1
Petroleum resins may be useful in the present invention as an effective additive when applied in aqueous systems that may limit oil sand accretion on metal surfaces exposed to oil sand-containing formations. The additives may have little tendancy to foam, a property which is beneficial for drilling operations.
Suitable petroleum resins include resins such as CAS#'s: 1271730-19-8, 944329-47-9, 934735-69-0, 308069-21-8, 152443-70-4, 64742-16-1, 64365-14-6, 63393-89-5, 63231-62-9, 9078-59-5, 53025-25-5, 53569-34-9, 63748-37-8, 86472-74-4, 136752-34-6, 172672-18-3, 199195-43-2, 313070-88-1, 877993-94-7 or 1271729-38-4. These petroleum resins are categorized as hydrocarbon resins from petroleum feedstocks, petroleum hydrocarbon resins, aliphatic hydrocarbon resins from petroleum or petroleum aromatic hydrocarbon resins and are available, for example, from chemical suppliers such as Neville Chemical and Eastman Chemicals. For example, some petroleum resins of interest are available from Neville Chemical under the trade marks NevtacTM, NevchemTM and LX- TM.
The petroleum resin is suitable for use in drilling fluid if it can be dispersed therein. For use during a drilling operation, for avoiding accretion downhole, the resin may be sized for circulation in the drilling fluid. Generally, therefore, the resin is suitable for use when having a particle size of less than 500 microns or less than 200 microns. For convenience, the resin may be ground to a particle size of 1 to 200 microns.
Without being limited by theory, it is believed that the petroleum resin combines with the heavy oil arising from the oil sand and forms a solid or highly viscous liquid that does not have the tacky properties normally associated with the heavy oil.
The anti-accretion additives of the present invention can be employed in drilling fluids in an amount dependent on the amount of oil expected to be present in the drilling fluid. Generally, the additive is generally employed at concentrations of at least 0.2% by weight of the drilling WSLega1\049190\00055\ 10110111v1
4 fluid. Use of the anti-accretion additive at a broad concentration range of 0.2% to 10.0% by weight of drilling fluid is effective to limit oil sand accretion on metal surfaces. While lower concentrations may be effective, the additives are generally employed at concentrations of at least 0.5% by weight of the drilling fluid. With more stringent economical considerations, an upper limit of 5.0% by weight of the drilling fluid is thought to be more reasonable. The narrower range of 0.5 to 5.0% has also demonstrated efficacy, however, concentrations below 0.5% and above 5.0% can be employed, if desired.
Aqueous-based drilling fluids, according to the present invention, include effective amounts of the anti-accretion additive which is a petroleum resin. The drilling fluid may include water and one or more additional additives such as, for example, a viscosifying additive, a fluid loss control additive, a corrosion inhibitor and/or another oil sand anti-accretion additive. The petroleum resin anti-accretion additive can be added to the water before or after the addition of the one or more additional additives.
It is anticipated that the present petroleum resin anti-accretion additive will work synergistically with other anti-accretion additives. These other anti-accretion additives may act as:
encapsulating agents that encapsulate the bitumen; oil-wetting agents that oil-wet the sand over the steel surfaces; emulsifiers that emulsify and entrain the bitumen; or oil absorbents that dry the oil. Chemically, these other anti-accretion additives include cationic, ionic, anionic polyacrylamide, surfactants, silicone-based, etc. compounds such as:
= a polymeric material which includes ¨0-- moieties pendent from a polymeric backbone, including, for example, at least 0.1 wt % and less than 1.5 wt % of a 87-89 mole %
hydrolysed polyvinylalcohol, having a weight average molecular weight of about 20,000 (US Patent Application 2012/0285745);
= a stabilizing polymer comprising at least one polymer selected from the group consisting of a styrene polymer, an acrylate polymer, a styrene-acrylate polymer, and any combination thereof; the stabilizing polymer useful at a concentration of 1 to 70% by weight of drilling fluid (US Patent Application 2012/0283149);
WSLega1\049190\00055\ 10110111v1 = a branched alcohol ethoxylate and/or a capped alcohol ethoxylate; and a detergent builder; the branched alcohol ethoxylate may be, for example, an alkyl polyethylene glycol ether based on C10-Guerbet alcohol and ethylene oxide and the capped alcohol ethoxylate may be chlorine-capped, that may be useful at concentrations of 0.01 to 1.5%
by weight of the branched alcohol ethoxylate and/or a capped alcohol ethoxylate; and 0.01 to 1.0% by weight of a detergent builder (US Patent 7,989,399 and US
Patent Application 2011/0306524);
= a non-ionic polymer or an anionic polymer, such as a polyacrylamide, for example, useful at a concentration of 0.5 to 4.5 kg/m3 in the drilling fluid (US Patent Application 2011/0224108);
= a polysiloxane, a copolymer of polysiloxane or mixtures thereof at a concentration of at least 0.5 1 in the drilling fluid (US Patent Application 2010/0298173);
= a quaternary ammonium salt (US Patent Application 2009/0099046);
= (a) one or more hydrophobically associating tetra-polymers, wherein the tetra-polymers comprise one type of monomer units selected from each of the following groups i)-iv): i) vinyl monomers comprising at least one amide group; ii) vinyl monomers comprising at least one carboxylic acid group or carboxylate group; iii) vinyl monomers comprising at least one of a quaternary nitrogen atom, a quaternary nitrogen atom with an alkyl sulfonate group, a quaternary nitrogen atom with a carboxylic acid group or a quaternary nitrogen atom with a carboxylate group; and iv) vinyl monomers comprising a hydrophobic group, wherein the vinyl comprising a hydrophobic group is a C8-20alkyl methacrylate ester; and (b) one or more water wetting agents, for example the tetra polymer may be employed at concentrations of up to 20 kg/m3 (US Patent 7,879,768);
= a polymer such as a polysaccharide based polymer, for example, in an amount from between 0.05% and 5% by volume; and possibly an aliphatic hydrocarbon solvent in an amount from between I% and 20% by volume for removing bitumen and oil from said oil sand; whereby an emulsion is formed having said water as an external phase and said aliphatic hydrocarbon as an internal phase of said emulsion, said emulsion containing WSLega1\049190\00055\ 10110111v1 said oil therein; and an enzyme based emulsion breaker in an amount from between 0.05% and 10% by volume for releasing said oil from said emulsion (US Patent 7,332,458);
= phosphonates or phosphate esters of organic ligands at a concentration of at least 0.1% by weight of the drilling fluid (US Patent 7,081,438); and, = an amine, an amide or a nitrogen containing heterocyclic compound, for example which may be present at a concentration of 0.2 to 5.0%. A suitable amine anti-accretion additive may include: polyamine; oxylated polyamine; aminosilane;
alkylamidopoliamine; Mannich amine; melamine formaldehyde resin; and polyamideamine. Possible examples of a suitable polyamine anti-accretion additive may include: hexanedinitrile, hydrogenated, high-boiling fraction (CAS # 68411-90-
Aqueous-based drilling fluids, according to the present invention, include effective amounts of the anti-accretion additive which is a petroleum resin. The drilling fluid may include water and one or more additional additives such as, for example, a viscosifying additive, a fluid loss control additive, a corrosion inhibitor and/or another oil sand anti-accretion additive. The petroleum resin anti-accretion additive can be added to the water before or after the addition of the one or more additional additives.
It is anticipated that the present petroleum resin anti-accretion additive will work synergistically with other anti-accretion additives. These other anti-accretion additives may act as:
encapsulating agents that encapsulate the bitumen; oil-wetting agents that oil-wet the sand over the steel surfaces; emulsifiers that emulsify and entrain the bitumen; or oil absorbents that dry the oil. Chemically, these other anti-accretion additives include cationic, ionic, anionic polyacrylamide, surfactants, silicone-based, etc. compounds such as:
= a polymeric material which includes ¨0-- moieties pendent from a polymeric backbone, including, for example, at least 0.1 wt % and less than 1.5 wt % of a 87-89 mole %
hydrolysed polyvinylalcohol, having a weight average molecular weight of about 20,000 (US Patent Application 2012/0285745);
= a stabilizing polymer comprising at least one polymer selected from the group consisting of a styrene polymer, an acrylate polymer, a styrene-acrylate polymer, and any combination thereof; the stabilizing polymer useful at a concentration of 1 to 70% by weight of drilling fluid (US Patent Application 2012/0283149);
WSLega1\049190\00055\ 10110111v1 = a branched alcohol ethoxylate and/or a capped alcohol ethoxylate; and a detergent builder; the branched alcohol ethoxylate may be, for example, an alkyl polyethylene glycol ether based on C10-Guerbet alcohol and ethylene oxide and the capped alcohol ethoxylate may be chlorine-capped, that may be useful at concentrations of 0.01 to 1.5%
by weight of the branched alcohol ethoxylate and/or a capped alcohol ethoxylate; and 0.01 to 1.0% by weight of a detergent builder (US Patent 7,989,399 and US
Patent Application 2011/0306524);
= a non-ionic polymer or an anionic polymer, such as a polyacrylamide, for example, useful at a concentration of 0.5 to 4.5 kg/m3 in the drilling fluid (US Patent Application 2011/0224108);
= a polysiloxane, a copolymer of polysiloxane or mixtures thereof at a concentration of at least 0.5 1 in the drilling fluid (US Patent Application 2010/0298173);
= a quaternary ammonium salt (US Patent Application 2009/0099046);
= (a) one or more hydrophobically associating tetra-polymers, wherein the tetra-polymers comprise one type of monomer units selected from each of the following groups i)-iv): i) vinyl monomers comprising at least one amide group; ii) vinyl monomers comprising at least one carboxylic acid group or carboxylate group; iii) vinyl monomers comprising at least one of a quaternary nitrogen atom, a quaternary nitrogen atom with an alkyl sulfonate group, a quaternary nitrogen atom with a carboxylic acid group or a quaternary nitrogen atom with a carboxylate group; and iv) vinyl monomers comprising a hydrophobic group, wherein the vinyl comprising a hydrophobic group is a C8-20alkyl methacrylate ester; and (b) one or more water wetting agents, for example the tetra polymer may be employed at concentrations of up to 20 kg/m3 (US Patent 7,879,768);
= a polymer such as a polysaccharide based polymer, for example, in an amount from between 0.05% and 5% by volume; and possibly an aliphatic hydrocarbon solvent in an amount from between I% and 20% by volume for removing bitumen and oil from said oil sand; whereby an emulsion is formed having said water as an external phase and said aliphatic hydrocarbon as an internal phase of said emulsion, said emulsion containing WSLega1\049190\00055\ 10110111v1 said oil therein; and an enzyme based emulsion breaker in an amount from between 0.05% and 10% by volume for releasing said oil from said emulsion (US Patent 7,332,458);
= phosphonates or phosphate esters of organic ligands at a concentration of at least 0.1% by weight of the drilling fluid (US Patent 7,081,438); and, = an amine, an amide or a nitrogen containing heterocyclic compound, for example which may be present at a concentration of 0.2 to 5.0%. A suitable amine anti-accretion additive may include: polyamine; oxylated polyamine; aminosilane;
alkylamidopoliamine; Mannich amine; melamine formaldehyde resin; and polyamideamine. Possible examples of a suitable polyamine anti-accretion additive may include: hexanedinitrile, hydrogenated, high-boiling fraction (CAS # 68411-90-
5);
dihexylenetriamine (CAS# 143-23-7); n-coco alkyl trimethylenediamine (CAS#
63-7); fatty acids, tall-oil, reaction products with diethylenetriamine (CAS#
61790-69-0);
tall oil reaction products with diethylenetriamine (CAS# 68140-14-7); 1,3-Propanediamine, Ni -(3-(tridecyloxy)propy1)-, branched (CAS# 68479-04-9); n-tallow alkyltripropylene-tetraamine (CAS# 68911-79-5); n-tallow alkyl trimethylenediamine (CAS# 61791-55-7); 1,2-ethandiamine, polymer with aziridine (CAS#25987-06-8);
polyethyleneimine (CAS #9002-98-6); and polyvinylamines. Possible examples of a suitable amide anti-accretion additive includes; amides from diethylenetriamines and tall-oil fatty acids; amides of rapeseed oil and dimethylaminopropyl amine;
polyamides; and dicyandiamide resins. Possible examples of a suitable nitrogen containing heterocyclic anti-accretion additive includes 1-(2-hydroxyethyl)-2-aly1-2-imidazoline, alkyl derived from tall oil fatty acid (CAS# 61791-39-7), pyridinium, 1-(phenylmethyl)-, alkyl derivative chlorides (CAS # 100765-57-9) and morpholine (CAS# 110-91-8) (Canadian Patent Application 2719610).
One or more of the aforementioned other anti-accretion additives may be employed, as desired, with the current petroleum resin anti-accretion additive.
The drilling fluid may be useful to inhibit oil sand accretion on metal surfaces or to remove heavy oil contamination from the drilling fluid. In one aspect, the drilling fluid can be used in a WSLega1\049190 \00055 10110111v1 method for drilling a wellbore through an oil sand-containing formation. In such a method without the present additive, drill cuttings can adhere as accretions to the metal surfaces of the drilling assembly, metal surfaces in the wellbore such as liners and casing and metal surfaces of the surface handling and solids control equipment. Thus, the present method includes circulating the aqueous-based drilling fluid, as described above, while operating a drilling assembly to drill the wellbore.
It will be appreciated that a drilling assembly can include, for example, a drilling head such as a bit, drill string, and possibly various control and monitoring subs.
It will also be appreciated, that it may not be necessary to use a drilling fluid containing the oil sand anti-accretion additive throughout an entire drilling operation. For example, a drilling fluid containing the oil sand anti-accretion additive may not be required during drilling through over burden. The method is useful during drilling wherein oil sand drill cuttings are being produced and very useful where there is more frequent contact between metal surfaces such as, for example, during drilling of the build section and/or the horizontal section of a wellbore.
If during drilling using a drilling fluid according to the present invention accretions are being deposited to an undesirable extent, the concentration of additive can be increased to inhibit further undesirable amounts of accretion and possibly to remove, at least to some degree, those accretions already deposited.
The petroleum resin anti-accretion additive of the present invention may also be used to reduce or remove oil contamination that has already accumulated in the drilling fluid, whether it is intended for reuse or disposal. Thus, in another aspect the petroleum resin can be used to remove oil dispersed in a drilling fluid for reconditioning that fluid or that may present operational or disposal issues. In this method, the petroleum resin can be added to a fluid that is contaminated with oil. The petroleum resin can be added while the drilling fluid is being circulated, for example, during a drilling operation or while running a liner into the wellbore.
Alternately, the petroleum resin can be added while the drilling fluid is being handled at surface, for example, for reconditioning or in preparation for disposal. The petroleum resin is selected and added as noted above in respect of particular resins of interest, concentrations and particle size.
WSLega1\049190\00055 \ 10110111v1 In these methods, the additive combines with the oil to form a material that is a substantially solid mass (solid or viscous liquid) and removal of the solid mass can be effected using standard methods, such as removal by surface solids control equipment, such as screens, cyclones, compactors, etc., used to remove drill solids. The additive combined with oil forms a material (i.e. solid or viscous liquid) that may be collected using the solids control equipment and can be readily removed from the solids control equipment. The material formed tends not to accrete to the screens, as untreated oil sand drill cuttings tend to do.
EXAMPLES
The following examples are presented to illustrate but not limit the scope of this invention. All percentages and parts are by weight unless otherwise noted.
Unless otherwise indicated, the examples are based on the following test procedure, which was developed to replicate dispersion of the oil while drilling and accretion of the oil sand and heavy oil onto metal surfaces. In the test procedure, 400 mL of water viscosified with 0.48% guar gum was added to a Waring commercial blender of 1L capacity and will be referred to as "drilling fluid". The anti-accretion additive was added to the drilling fluid under mixing. The mixer was set to high speed and whilst mixing, 40 g of oil sand (unspecified heavy oil to sand ratio) was added to the drilling fluid. The resultant drilling fluid and oil sand slurry was sheared at high speed for 30 seconds to disperse the oil sand and ensure homogeneity.
The drilling fluid/oil sand mixture was then transferred into a 1 L glass beaker for observation. If further testing was required the mixture was then transferred to a 316 stainless steel drilling fluid aging cell such as one supplied by OFITETm having an internal diameter of 6.5 cm and a depth of 15.5 cm. To simulate downhole assembly/shale shaker, pre-weighed mild steel sleeves were inserted into the aging cell. The cell was sealed and placed horizontally in an aging cell roller oven similar to an OFITETm Model 173 00 RC Roller Oven with the temperature set at 35 C.
The rotary apparatus was turned on to rotate the cell at approximately 19rpm.
After approximately 16 hours, the aging cells were removed from the roller oven; the steel shims of the steel sleeves were removed from the aging cell, rinsed under cold water to remove any loose VVSLega1\049190\00055\ 10110111v1 material on the steel, and then rinsed with methanol to remove water. The sleeves were left to dry and inspected. The heavy oil or bitumen adhesion was then noted.
Example 1 A base sample of drilling fluid was prepared. From this sample 5 aliquots of 400 mL each were drawn. The anti-accretion additive in this example was a petroleum resin, CAS#
64742-16-1, having a softening point of 150 C (categorized as a petroleum aromatic hydrocarbon resin by Neville Chemical and available as NevchemTM 150). The anti-accretion additive was ground to a particle size distribution of approximately 1 ¨ 200 microns (hereafter referred to as petroleum resin). This material was dispersed into each of the 5 aliquots of drilling fluid at 0, 25, 50, 75 and 100 kg/m3 respectively. The resultant suspensions were sheared with 40 g of oil sands, transferred to a beaker and observed. The oil sand and resin were found to bind together and form a homogenous material. Fluid clarity improved for each of the samples with substantial oil dispersed at a treatment rate of 0 kg/m3 and no dispersed oil evident at the highest treatment rate of 100 kg/m3. Inspection of the fluid also revealed that without petroleum resin present, substantially all of the oil separated from the sand, while with the petroleum resin present, substantially all of the oil remained bound with the sand and the petroleum resin forming a finely distributed but homogeneous solid.
Example 2 Drilling fluid was prepared and further treated with 10 L/m3 of an imidazoline; the reaction product of tall oil fatty acids and diethylenetriamine, hereinafter referred to as "treated drilling fluid". The use of the imidazoline to treat oil sand accretion is detailed in Canadian Patent Application 2719610. Field experience with this chemistry has shown that while it is effective in treatment of steel surfaces, the time required for the imidazoline to wet the sand and bind the bitumen to the sand may be long and in some drilling applications the time needs to be shorter.
Further issues are that the drill cuttings produced by fluids treated with this chemistry may retain some stickiness and may tend to agglomerate on the solids.
wsLegal\049190\00055\ ionoinvi A total of five 400 mL aliquots of drilling fluid treated with the imidazoline were prepared. A
petroleum resin, CAS# 64742-16-1 with a softening point of 150 C was ground to a particle size distribution of approximately 1 ¨ 200 microns. This material was dispersed into each of the 5 aliquots of treated drilling fluid at 0, 25, 50, 75 and 100 kg/m3 respectively. The resultant suspensions were sheared with 40 g of oil sands for 30 seconds at high speed to give a drilling fluid/oil sand mixture, transferred to a beaker and observed. The oil sand was rapidly incorporated with the imidazoline and petroleum resin into small solid masses of approximately 1/8 to VI inch diameter. In the treated drilling fluid without resin (0 kg/m3), the solids were tacky and free oil was noted in the fluid. The solids were soft but not tacky in the treated fluid with 25 kg/m3 loading of petroleum resin. For the 50, 75 and 100 kg/m3 petroleum resin loadings, the mass formed between the imidazoline, oil sand and resin was dry to touch and the particles crumbled when handled.
Example 3 The mixtures from example 2 were aged in stainless steel cells lined with mild steel sleeves as previously described at 35 C for approximately 16 hours. Minimal accretion was noted for the treated drilling fluid without resin and the treated drilling fluid with 25 kg/m3 petroleum resin.
No accretion was visible for the treated drilling fluid with resin present at 50, 75 and 100 kg/m3.
Example 4 An aliquot of treated drilling fluid was prepared, as in example 2 and 75 kg/m3 of petroleum resin CAS# 64742-16-1 (particle size 1 ¨ 200 microns) was added. The fluid was sheared for 30 seconds with 40 g of oil sands. The treated drilling fluid remained clear.
After 16 hours of aging in a stainless steel cell lined with a mild steel sleeve, as previously described, no evidence of dispersed oil was found in the drilling fluid. No amount of oil sand was found to adhere to the steel sleeve in contact with the treated drilling fluid containing the petroleum resin. Solids were found to agglomerate into a cylindrical shape in the ageing cell. The solids were hard, dry to the touch and readily crumbled with gentle application of pressure. The fluid, steel sleeve and solids from the petroleum resin-treated system are shown in Figures 1, 2 and 3, respectively.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to those embodiments will WSLega1\049190\00055\ 10110111v1 . .
be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the full scope consistent with the claims, wherein reference to an element in the singular, such as by use of the article "a" or "an" is not intended to mean "one and only one" unless specifically so stated, but rather "one or more". All structural and functional equivalents to the elements of the various embodiments described throughout the disclosure that are known or later come to be known to those of ordinary skill in the art are intended to be encompassed by the elements of the claims.
Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims.
wsiegal\049190\00055\ ionoinvi
dihexylenetriamine (CAS# 143-23-7); n-coco alkyl trimethylenediamine (CAS#
63-7); fatty acids, tall-oil, reaction products with diethylenetriamine (CAS#
61790-69-0);
tall oil reaction products with diethylenetriamine (CAS# 68140-14-7); 1,3-Propanediamine, Ni -(3-(tridecyloxy)propy1)-, branched (CAS# 68479-04-9); n-tallow alkyltripropylene-tetraamine (CAS# 68911-79-5); n-tallow alkyl trimethylenediamine (CAS# 61791-55-7); 1,2-ethandiamine, polymer with aziridine (CAS#25987-06-8);
polyethyleneimine (CAS #9002-98-6); and polyvinylamines. Possible examples of a suitable amide anti-accretion additive includes; amides from diethylenetriamines and tall-oil fatty acids; amides of rapeseed oil and dimethylaminopropyl amine;
polyamides; and dicyandiamide resins. Possible examples of a suitable nitrogen containing heterocyclic anti-accretion additive includes 1-(2-hydroxyethyl)-2-aly1-2-imidazoline, alkyl derived from tall oil fatty acid (CAS# 61791-39-7), pyridinium, 1-(phenylmethyl)-, alkyl derivative chlorides (CAS # 100765-57-9) and morpholine (CAS# 110-91-8) (Canadian Patent Application 2719610).
One or more of the aforementioned other anti-accretion additives may be employed, as desired, with the current petroleum resin anti-accretion additive.
The drilling fluid may be useful to inhibit oil sand accretion on metal surfaces or to remove heavy oil contamination from the drilling fluid. In one aspect, the drilling fluid can be used in a WSLega1\049190 \00055 10110111v1 method for drilling a wellbore through an oil sand-containing formation. In such a method without the present additive, drill cuttings can adhere as accretions to the metal surfaces of the drilling assembly, metal surfaces in the wellbore such as liners and casing and metal surfaces of the surface handling and solids control equipment. Thus, the present method includes circulating the aqueous-based drilling fluid, as described above, while operating a drilling assembly to drill the wellbore.
It will be appreciated that a drilling assembly can include, for example, a drilling head such as a bit, drill string, and possibly various control and monitoring subs.
It will also be appreciated, that it may not be necessary to use a drilling fluid containing the oil sand anti-accretion additive throughout an entire drilling operation. For example, a drilling fluid containing the oil sand anti-accretion additive may not be required during drilling through over burden. The method is useful during drilling wherein oil sand drill cuttings are being produced and very useful where there is more frequent contact between metal surfaces such as, for example, during drilling of the build section and/or the horizontal section of a wellbore.
If during drilling using a drilling fluid according to the present invention accretions are being deposited to an undesirable extent, the concentration of additive can be increased to inhibit further undesirable amounts of accretion and possibly to remove, at least to some degree, those accretions already deposited.
The petroleum resin anti-accretion additive of the present invention may also be used to reduce or remove oil contamination that has already accumulated in the drilling fluid, whether it is intended for reuse or disposal. Thus, in another aspect the petroleum resin can be used to remove oil dispersed in a drilling fluid for reconditioning that fluid or that may present operational or disposal issues. In this method, the petroleum resin can be added to a fluid that is contaminated with oil. The petroleum resin can be added while the drilling fluid is being circulated, for example, during a drilling operation or while running a liner into the wellbore.
Alternately, the petroleum resin can be added while the drilling fluid is being handled at surface, for example, for reconditioning or in preparation for disposal. The petroleum resin is selected and added as noted above in respect of particular resins of interest, concentrations and particle size.
WSLega1\049190\00055 \ 10110111v1 In these methods, the additive combines with the oil to form a material that is a substantially solid mass (solid or viscous liquid) and removal of the solid mass can be effected using standard methods, such as removal by surface solids control equipment, such as screens, cyclones, compactors, etc., used to remove drill solids. The additive combined with oil forms a material (i.e. solid or viscous liquid) that may be collected using the solids control equipment and can be readily removed from the solids control equipment. The material formed tends not to accrete to the screens, as untreated oil sand drill cuttings tend to do.
EXAMPLES
The following examples are presented to illustrate but not limit the scope of this invention. All percentages and parts are by weight unless otherwise noted.
Unless otherwise indicated, the examples are based on the following test procedure, which was developed to replicate dispersion of the oil while drilling and accretion of the oil sand and heavy oil onto metal surfaces. In the test procedure, 400 mL of water viscosified with 0.48% guar gum was added to a Waring commercial blender of 1L capacity and will be referred to as "drilling fluid". The anti-accretion additive was added to the drilling fluid under mixing. The mixer was set to high speed and whilst mixing, 40 g of oil sand (unspecified heavy oil to sand ratio) was added to the drilling fluid. The resultant drilling fluid and oil sand slurry was sheared at high speed for 30 seconds to disperse the oil sand and ensure homogeneity.
The drilling fluid/oil sand mixture was then transferred into a 1 L glass beaker for observation. If further testing was required the mixture was then transferred to a 316 stainless steel drilling fluid aging cell such as one supplied by OFITETm having an internal diameter of 6.5 cm and a depth of 15.5 cm. To simulate downhole assembly/shale shaker, pre-weighed mild steel sleeves were inserted into the aging cell. The cell was sealed and placed horizontally in an aging cell roller oven similar to an OFITETm Model 173 00 RC Roller Oven with the temperature set at 35 C.
The rotary apparatus was turned on to rotate the cell at approximately 19rpm.
After approximately 16 hours, the aging cells were removed from the roller oven; the steel shims of the steel sleeves were removed from the aging cell, rinsed under cold water to remove any loose VVSLega1\049190\00055\ 10110111v1 material on the steel, and then rinsed with methanol to remove water. The sleeves were left to dry and inspected. The heavy oil or bitumen adhesion was then noted.
Example 1 A base sample of drilling fluid was prepared. From this sample 5 aliquots of 400 mL each were drawn. The anti-accretion additive in this example was a petroleum resin, CAS#
64742-16-1, having a softening point of 150 C (categorized as a petroleum aromatic hydrocarbon resin by Neville Chemical and available as NevchemTM 150). The anti-accretion additive was ground to a particle size distribution of approximately 1 ¨ 200 microns (hereafter referred to as petroleum resin). This material was dispersed into each of the 5 aliquots of drilling fluid at 0, 25, 50, 75 and 100 kg/m3 respectively. The resultant suspensions were sheared with 40 g of oil sands, transferred to a beaker and observed. The oil sand and resin were found to bind together and form a homogenous material. Fluid clarity improved for each of the samples with substantial oil dispersed at a treatment rate of 0 kg/m3 and no dispersed oil evident at the highest treatment rate of 100 kg/m3. Inspection of the fluid also revealed that without petroleum resin present, substantially all of the oil separated from the sand, while with the petroleum resin present, substantially all of the oil remained bound with the sand and the petroleum resin forming a finely distributed but homogeneous solid.
Example 2 Drilling fluid was prepared and further treated with 10 L/m3 of an imidazoline; the reaction product of tall oil fatty acids and diethylenetriamine, hereinafter referred to as "treated drilling fluid". The use of the imidazoline to treat oil sand accretion is detailed in Canadian Patent Application 2719610. Field experience with this chemistry has shown that while it is effective in treatment of steel surfaces, the time required for the imidazoline to wet the sand and bind the bitumen to the sand may be long and in some drilling applications the time needs to be shorter.
Further issues are that the drill cuttings produced by fluids treated with this chemistry may retain some stickiness and may tend to agglomerate on the solids.
wsLegal\049190\00055\ ionoinvi A total of five 400 mL aliquots of drilling fluid treated with the imidazoline were prepared. A
petroleum resin, CAS# 64742-16-1 with a softening point of 150 C was ground to a particle size distribution of approximately 1 ¨ 200 microns. This material was dispersed into each of the 5 aliquots of treated drilling fluid at 0, 25, 50, 75 and 100 kg/m3 respectively. The resultant suspensions were sheared with 40 g of oil sands for 30 seconds at high speed to give a drilling fluid/oil sand mixture, transferred to a beaker and observed. The oil sand was rapidly incorporated with the imidazoline and petroleum resin into small solid masses of approximately 1/8 to VI inch diameter. In the treated drilling fluid without resin (0 kg/m3), the solids were tacky and free oil was noted in the fluid. The solids were soft but not tacky in the treated fluid with 25 kg/m3 loading of petroleum resin. For the 50, 75 and 100 kg/m3 petroleum resin loadings, the mass formed between the imidazoline, oil sand and resin was dry to touch and the particles crumbled when handled.
Example 3 The mixtures from example 2 were aged in stainless steel cells lined with mild steel sleeves as previously described at 35 C for approximately 16 hours. Minimal accretion was noted for the treated drilling fluid without resin and the treated drilling fluid with 25 kg/m3 petroleum resin.
No accretion was visible for the treated drilling fluid with resin present at 50, 75 and 100 kg/m3.
Example 4 An aliquot of treated drilling fluid was prepared, as in example 2 and 75 kg/m3 of petroleum resin CAS# 64742-16-1 (particle size 1 ¨ 200 microns) was added. The fluid was sheared for 30 seconds with 40 g of oil sands. The treated drilling fluid remained clear.
After 16 hours of aging in a stainless steel cell lined with a mild steel sleeve, as previously described, no evidence of dispersed oil was found in the drilling fluid. No amount of oil sand was found to adhere to the steel sleeve in contact with the treated drilling fluid containing the petroleum resin. Solids were found to agglomerate into a cylindrical shape in the ageing cell. The solids were hard, dry to the touch and readily crumbled with gentle application of pressure. The fluid, steel sleeve and solids from the petroleum resin-treated system are shown in Figures 1, 2 and 3, respectively.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to those embodiments will WSLega1\049190\00055\ 10110111v1 . .
be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the full scope consistent with the claims, wherein reference to an element in the singular, such as by use of the article "a" or "an" is not intended to mean "one and only one" unless specifically so stated, but rather "one or more". All structural and functional equivalents to the elements of the various embodiments described throughout the disclosure that are known or later come to be known to those of ordinary skill in the art are intended to be encompassed by the elements of the claims.
Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims.
wsiegal\049190\00055\ ionoinvi
Claims (89)
PRIVILEGE IS CLAIMED, ARE DEFINED AS FOLLOWS:
1. An oil sand anti-accretion additive for drilling fluids to limit accretion of oil sands on metal surfaces comprising: a petroleum resin.
2. The oil sand anti-accretion additive of claim 1 wherein the petroleum resin is a petroleum aromatic hydrocarbon resin.
3. The oil sand anti-accretion additive of claim 1 wherein the petroleum resin is selected from the group consisting of: CAS#'s: 1271730-19-8, 944329-47-9, 934735-69-0, 308069-21-8, 152443-70-4, 64742-16-1, 64365-14-6, 63393-89-5, 63231-62-9, 9078-5, 53025-25-5, 53569-34-9, 63748-37-8, 86472-74-4, 136752-34-6, 172672-18-3, 199195-43-2, 313070-88-1, 877993-94-7 and 1271729-38-4.
4. The oil sand anti-accretion additive of claim 1 wherein the petroleum resin is CAS#
64742-16-1.
64742-16-1.
5. An aqueous drilling fluid for heavy oil formations, the aqueous drilling fluid comprising:
an effective amount of a petroleum resin for limiting oil sand accretion.
an effective amount of a petroleum resin for limiting oil sand accretion.
6. The aqueous drilling fluid of claim 5 wherein the effective amount is at least 0.2% by weight of the drilling fluid.
7. The aqueous drilling fluid of claim 5 wherein the effective amount is 0.2% to 10.0% by weight of the drilling fluid.
8. The aqueous drilling fluid of claim 5 wherein the effective amount is 0.5 to 5.0% by weight of the drilling fluid.
9. The aqueous drilling fluid of claim 5 wherein the petroleum resin is a solid with a particle size of less than 500 microns.
10. The aqueous drilling fluid of claim 5 wherein the petroleum resin is a petroleum aromatic hydrocarbon resin.
11 The aqueous drilling fluid of claim 5 wherein the petroleum resin is selected from the group consisting of: CAS#'s: 1271730-19-8, 944329-47-9, 934735-69-0, 308069-21-8, 152443-70-4, 64742-16-1, 64365-14-6, 63393-89-5, 63231-62-9, 9078-59-5, 53025-25-5, 53569-34-9, 63748-37-8, 86472-74-4, 136752-34-6, 172672-18-3, 199195-43-2, 88-1, 877993-94-7 and 1271729-38-4.
12. The aqueous drilling fluid of claim 5 wherein the petroleum resin is CAS# 64742-16-1.
13. The aqueous drilling fluid of claim 5 further comprising a second anti-accretion additive.
14. The aqueous drilling fluid of claim 13 wherein the second anti-accretion additive has activity as at least one of: an encapsulating agent; an oil-wetting agent; an emulsifier; and an oil absorbent.
15. The aqueous drilling fluid of claim 13 wherein the second anti-accretion additive is a polymeric material that includes --O-- moieties pendent from a polymeric backbone.
16. The aqueous drilling fluid of claim 13 wherein the second anti-accretion additive is a stabilizing polymer comprising at least one polymer selected from the group consisting of: a styrene polymer, an acrylate polymer, a styrene-acrylate polymer, and any combination thereof.
17. The aqueous drilling fluid of claim 13 wherein the second anti-accretion additive includes (a) at least one of (i) a branched alcohol ethoxylate and (ii) a capped alcohol ethoxylate;
and (b) a detergent builder.
and (b) a detergent builder.
18. The aqueous drilling fluid of claim 13 wherein the second anti-accretion additive is a non-ionic polymer or an anionic polymer.
19. The aqueous drilling fluid of claim 13 wherein the second anti-accretion additive is selected from a group consisting of: a polysiloxane, a copolymer of polysiloxane and mixtures thereof.
20. The aqueous drilling fluid of claim 13 wherein the second anti-accretion additive is a quaternary ammonium salt.
21. The aqueous drilling fluid of claim 13 wherein the second anti-accretion additive includes (a) one or more hydrophobically associating tetra-polymers, wherein the tetra-polymers comprise a monomer unit selected from the following groups i)-iv): i) vinyl monomers comprising at least one amide group; ii) vinyl monomers comprising at least one carboxylic acid group or carboxylate group; iii) vinyl monomers comprising at least one of a quaternary nitrogen atom, a quaternary nitrogen atom with an alkyl sulfonate group, a quaternary nitrogen atom with a carboxylic acid group or a quaternary nitrogen atom with a carboxylate group; and iv) vinyl monomers comprising a hydrophobic group, wherein the vinyl comprising a hydrophobic group is a C8-20 alkyl methacrylate ester;
and (b) one or more water wetting agents.
and (b) one or more water wetting agents.
22. The aqueous drilling fluid of claim 13 wherein the second anti-accretion additive is a polysaccharide based polymer.
23. The aqueous drilling fluid of claim 13 wherein the second anti-accretion additive is a phosphonate or phosphate ester of organic ligands.
24. The aqueous drilling fluid of claim 13 wherein the second anti-accretion additive is selected from the group consisting of: an amine, an amide and a nitrogen containing heterocyclic compound.
25. A method for drilling a wellbore into an oil sand containing formation, the method comprising: operating a drilling assembly to drill a wellbore into an oil sand containing formation; and, circulating an aqueous-based drilling fluid through the wellbore being drilled, the aqueous-based drilling fluid including an oil sand anti-accretion additive including a petroleum resin.
26. The method of claim 25 wherein the oil sand anti-accretion additive is present in the drilling fluid at a concentration of at least 0.2% by weight of the drilling fluid.
27. The method of claim 25 wherein the oil sand anti-accretion additive is present in the drilling fluid at a concentration of 0.2% to 10.0% by weight of the drilling fluid.
28. The method of claim 25 wherein the oil sand anti-accretion additive is present in the drilling fluid at a concentration of 0.5% to 5.0% by weight of the drilling fluid.
29. The method of claim 25 wherein the petroleum resin is a solid with a particle size of less than 500 microns.
30. The method of claim 25 wherein the drilling fluid containing oil sand anti-accretion additive is circulated when oil sand drill cuttings are produced.
31. The method of claim 25 wherein the drilling fluid containing oil sand anti-accretion additive is circulated during drilling of a build section of the wellbore.
32. The method of claim 25 wherein the drilling fluid containing oil sand anti-accretion additive is circulated during drilling of a horizontal section of the wellbore.
33. The method of claim 25 further comprising removing at surface a material including sand, oil and the petroleum resin.
34. The method of claim 33 wherein removing at surface includes collecting with solids control equipment.
35. The method of claim 25 wherein the petroleum resin is a petroleum aromatic hydrocarbon resin.
36. The method of claim 25 wherein the petroleum resin is selected from the group consisting of: CAS#'s: 1271730-19-8, 944329-47-9, 934735-69-0, 308069-21-8, 152443-70-4, 64742-16-1, 64365-14-6, 63393-89-5, 63231-62-9, 9078-59-5, 53025-25-5, 53569-34-9, 63748-37-8, 86472-74-4, 136752-34-6, 172672-18-3, 199195-43-2, 313070-88-1, 877993-94-7 and 1271729-38-4.
37. The method of claim 25 wherein the petroleum resin is CAS# 64742-16-1.
38. The method of claim 25 further comprising a second anti-accretion additive.
39. The method of claim 38 wherein the second anti-accretion additive has activity as at least one of: an encapsulating agent; an oil-wetting agent; an emulsifier; and an oil absorbent.
40. The method of claim 38 wherein the second anti-accretion additive is a polymeric material which includes --O-- moieties pendent from a polymeric backbone.
41. The method of claim 38 wherein the second anti-accretion additive is a stabilizing polymer comprising at least one polymer selected from the group consisting of:
a styrene polymer, an acrylate polymer, a styrene-acrylate polymer, and any combination thereof.
a styrene polymer, an acrylate polymer, a styrene-acrylate polymer, and any combination thereof.
42. The method of claim 38 wherein the second anti-accretion additive includes (a) at least one of (i) a branched alcohol ethoxylate and (ii) a capped alcohol ethoxylate;
and (b) a detergent builder.
and (b) a detergent builder.
43. The method of claim 38 wherein the second anti-accretion additive is a non-ionic polymer or an anionic polymer.
44. The method of claim 38 wherein the second anti-accretion additive is selected from a group consisting of: a polysiloxane, a copolymer of polysiloxane and mixtures thereof.
45. The method of claim 38 wherein the second anti-accretion additive is a quaternary ammonium salt.
46. The method of claim 38 wherein the second anti-accretion additive includes (a) one or more hydrophobically associating tetra-polymers, wherein the tetra-polymers comprise a monomer unit selected from the following groups: i) vinyl monomers comprising at least one amide group; ii) vinyl monomers comprising at least one carboxylic acid group or carboxylate group; iii) vinyl monomers comprising at least one of a quaternary nitrogen atom, a quaternary nitrogen atom with an alkyl sulfonate group, a quaternary nitrogen atom with a carboxylic acid group or a quaternary nitrogen atom with a carboxylate group; and iv) vinyl monomers comprising a hydrophobic group, wherein the vinyl comprising a hydrophobic group is a C8-20 alkyl methacrylate ester; and (b) one or more water wetting agents.
47. The method of claim 38 wherein the second anti-accretion additive is a polysaccharide based polymer.
48. The method of claim 38 wherein the second anti-accretion additive is a phosphonate or a phosphate ester of organic ligands.
49. The method of claim 38 wherein the second anti-accretion additive is selected from the group consisting of: an amine, an amide and a nitrogen containing heterocyclic compound.
50. A method for minimizing heavy oil accretion during a wellbore drilling operation, the method comprising: circulating an aqueous-based drilling fluid through the wellbore being drilled, the aqueous-based drilling fluid including an oil sand anti-accretion additive including a petroleum resin.
51. The method of claim 50 wherein the oil sand anti-accretion additive is present in the drilling fluid at a concentration of at least 0.2% by weight of the drilling fluid.
52. The method of claim 50 wherein the oil sand anti-accretion additive is present in the drilling fluid at a concentration of 0.2% to 10.0% by weight of the drilling fluid.
53. The method of claim 50 wherein the oil sand anti-accretion additive is present in the drilling fluid at a concentration of 0.5% to 5.0% by weight of the drilling fluid.
54. The method of claim 50 wherein the oil sand anti-accretion additive is a solid at wellbore temperatures with a particle size of less than 500 microns.
55. The method of claim 50 wherein the circulating occurs when oil sand drill cuttings are produced.
56. The method of claim 50 wherein the circulating occurs during drilling of a build section of the wellbore.
57. The method of claim 50 wherein the circulating occurs during drilling of a horizontal section of the wellbore.
58. The method of claim 50 further comprising removing at surface a material including sand, oil and the petroleum resin.
59. The method of claim 58 wherein removing at surface includes collecting with solids control equipment.
60. The method of claim 50 wherein the petroleum resin is a petroleum aromatic hydrocarbon resin.
61. The method of claim 50 wherein the petroleum resin is selected from the group consisting of: CAS#'s: 1271730-19-8, 944329-47-9, 934735-69-0, 308069-21-8, 152443-70-4, 64742-16-1, 64365-14-6, 63393-89-5, 63231-62-9, 9078-59-5, 53025-25-5, 53569-34-9, 63748-37-8, 86472-74-4, 136752-34-6, 172672-18-3, 199195-43-2, 313070-88-1, 877993-94-7 and 1271729-38-4.
62. The method of claim 50 wherein the petroleum resin is CAS# 64742-16-1.
63. The method of claim 50 further comprising a second anti-accretion additive.
64. The method of claim 63 wherein the second anti-accretion additive has activity as at least one of: an encapsulating agent; an oil-wetting agent; an emulsifier; and an oil absorbent.
65. The method of claim 63 wherein the second anti-accretion additive is a polymeric material which includes --O-- moieties pendent from a polymeric backbone.
66. The method of claim 63 wherein the second anti-accretion additive is a stabilizing polymer comprising at least one polymer selected from the group consisting of:
a styrene polymer, an acrylate polymer, a styrene-acrylate polymer, and any combination thereof.
a styrene polymer, an acrylate polymer, a styrene-acrylate polymer, and any combination thereof.
67. The method of claim 63 wherein the second anti-accretion additive includes (a) at least one of (i) a branched alcohol ethoxylate and (ii) a capped alcohol ethoxylate;
and (b) a detergent builder.
and (b) a detergent builder.
68. The method of claim 63 wherein the second anti-accretion additive is a non-ionic polymer or an anionic polymer.
69. The method of claim 63 wherein the second anti-accretion additive is selected from a group consisting of: a polysiloxane, a copolymer of polysiloxane and mixtures thereof.
70. The method of claim 63 wherein the second anti-accretion additive is a quaternary ammonium salt.
71. The method of claim 63 wherein the second anti-accretion additive includes (a) one or more hydrophobically associating tetra-polymers, wherein the tetra-polymers comprise a monomer unit selected from the following groups: i) vinyl monomers comprising at least one amide group; ii) vinyl monomers comprising at least one carboxylic acid group or carboxylate group; iii) vinyl monomers comprising at least one of a quaternary nitrogen atom, a quaternary nitrogen atom with an alkyl sulfonate group, a quaternary nitrogen atom with a carboxylic acid group or a quaternary nitrogen atom with a carboxylate group; and iv) vinyl monomers comprising a hydrophobic group, wherein the vinyl comprising a hydrophobic group is a C8-20 alkyl methacrylate ester; and (b) one or more water wetting agents.
72. The method of claim 63 wherein the second anti-accretion additive is a polysaccharide based polymer.
73. The method of claim 63 wherein the second anti-accretion additive is a phosphonate or phosphate ester of organic ligands.
74. The method of claim 63 wherein the second anti-accretion additive is selected from the group consisting of: an amine, an amide and a nitrogen containing heterocyclic compound.
75. A method for removing heavy oil from a drilling fluid comprising:
adding a petroleum resin in an effective amount to bind at least some free oil present in the drilling fluid.
adding a petroleum resin in an effective amount to bind at least some free oil present in the drilling fluid.
76. The method of claim 75 wherein adding is carried out while circulating the drilling fluid through the wellbore.
77. The method of claim 75 wherein adding is carried out while drilling the wellbore.
78. The method of claim 75 wherein adding is carried out while running a liner into the wellbore.
79. The method of claim 75 wherein the drilling fluid is intended for disposal.
80. The method of claim 75 wherein the drilling fluid is intended for reuse.
81. The method of claim 75 wherein the effective amount is at least 0.2% by weight of the drilling fluid.
82. The method of claim 75 wherein the effective amount is 0.2% to 10.0% by weight of the drilling fluid.
83. The method of claim 75 wherein the effective amount is 0.5% to 5.0% by weight of the drilling fluid.
84. The method of claim 75 wherein the petroleum resin is a solid with a particle size of less than 500 microns.
85. The method of claim 75 further comprising removing a material including sand, oil and the petroleum resin.
86. The method of claim 85 wherein removing includes collecting with solids control equipment.
87. The method of claim 75 wherein the petroleum resin is a petroleum aromatic hydrocarbon resin.
88. The method of claim 75 wherein the petroleum resin is selected from the group consisting of: CAS#'s: 1271730-19-8, 944329-47-9, 934735-69-0, 308069-21-8, 152443-70-4, 64742-16-1, 64365-14-6, 63393-89-5, 63231-62-9, 9078-59-5, 53025-25-5, 53569-34-9, 63748-37-8, 86472-74-4, 136752-34-6, 172672-18-3, 199195-43-2, 313070-88-1, 877993-94-7 and 1271729-38-4.
89. The method of claim 25 wherein the petroleum resin is CAS# 64742-16-1.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017011894A1 (en) * | 2015-07-23 | 2017-01-26 | Uniquem Inc. | Modified natural polymers as bitumen encapsulants |
| CN111139043A (en) * | 2018-11-06 | 2020-05-12 | 中国石油化工股份有限公司 | Plugging anti-collapse treating agent for shale stratum and preparation method thereof |
| CN116064022A (en) * | 2021-11-01 | 2023-05-05 | 中国石油化工股份有限公司 | Oil field profile control water shutoff composition and preparation method and application thereof |
-
2014
- 2014-03-26 CA CA2847947A patent/CA2847947C/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017011894A1 (en) * | 2015-07-23 | 2017-01-26 | Uniquem Inc. | Modified natural polymers as bitumen encapsulants |
| US10301531B2 (en) | 2015-07-23 | 2019-05-28 | Uniquem Inc. | Modified natural polymers as bitumen encapsulants |
| CN111139043A (en) * | 2018-11-06 | 2020-05-12 | 中国石油化工股份有限公司 | Plugging anti-collapse treating agent for shale stratum and preparation method thereof |
| CN116064022A (en) * | 2021-11-01 | 2023-05-05 | 中国石油化工股份有限公司 | Oil field profile control water shutoff composition and preparation method and application thereof |
| CN116064022B (en) * | 2021-11-01 | 2024-06-04 | 中国石油化工股份有限公司 | Oil field profile control water shutoff composition and preparation method and application thereof |
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| Publication number | Publication date |
|---|---|
| CA2847947C (en) | 2022-03-15 |
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