61 results about "Asphaltene deposition" patented technology

An overbased magnesium composition deposit control additive for residual fuel oils and turbine fuels is an overbased magnesium sulfonate, carboxylate or phenate or mixtures thereof containing at least 14% and upwards to about 18% by weight of magnesium and containing a succinic anhydride and lower carboxylic acid co-promoter reaction product. The additive when added to fuel oils, such as residual fuel oils containing high asphaltenes, reduces, if not eliminates, magnesium / asphaltene deposits or sediment and the consequential plugging of filters. The additive also reduces, if not eliminates, vanadium caused corrosion in the turbine. The invention is also the process for preparing the overbased composition or deposit control additive, wherein the overbasing reaction incorporates the combination of a lower carboxylic acid, preferably acetic acid and a succinic anhydride, preferably dodecenyl succinic anhydride (DDSA), as the co-promoter.

Asphaltene control additives are added to base fluids which are introduced directly or indirectly into a hydrocarbon-bearing formation to mitigate asphaltene deposition in the formation which results in improved permeability in the formation and production of hydrocarbons therefrom. The fluids to which the additive is added may be liquid CO2-based, aqueous-based or non-aqueous-based fluids. Further, the fluids are fracturing fluids, drilling fluids and wellbore treatment fluids such as acidizing fluids.

Compositions comprising at least one C4-C30 olefin or oxidation product thereof and kerosene or an aromatic solvent are particularly effective for use in removing asphaltene and asphaltene-containing organic deposits and in preventing or reducing the precipitation and deposition of asphaltenes from hydrocarbon fluids. When added to heavy oils comprising asphaltenes, alone or in combination with dispersants and further inhibitors, the invented compositions lower viscosity and pour point, and aid in preventing asphaltene precipitation during transport and in combustion.

Generating heat within a combination solvent / acid system removes undesirable deposits from petroleum reservoir formations (especially the near well-bore region), oilfield equipment, and petroleum processing equipment. An exothermic reaction occurs between the solvent and the acid and the heat evolved helps remove organic solid deposits. The acids may include organic acid compounds, such as sulfonic acids, sulfuric acid and nitric acid. The solvents may include terpene- and terpene-derivative-containing solvents, including, but not necessarily limited to, limonene, pinene, dipentene, myrcene, turpentines and compounds having at least one double bond, such as methyl furan, dienes, styrene, vinyl acetate and the like. The exothermic reaction produces a great amount of heat, and together with using certain acids and solvents already known as effective to remove paraffin and asphaltene deposition, removing such deposits is improved.

A method, apparatus and composition are described for safe energy delivery down hole resulting in increased recovery of subterranean hydrocarbons. The method utilizes, for example, the reaction of non-alkane fuels and selective oxidizers which are non-selective toward alkane chemical compounds. The method further utilizes an acid solution reaction with aforementioned reaction for elimination of any insoluble products of reaction permitting flow within formation strata. The energy released in the subterranean reaction is utilized to heat the production tubing, the wellbore, the formation or the formation hydrocarbons thereby lowering fluid viscosity and permitting greater flow especially for heavy oils, asphaltene deposits and / or paraffin deposits. Further, safe delivery of oxidizers can be accomplished without limit on depth as the selective oxidizer may be delivered to point of use down hole as most all formations of interest contain primarily alkane hydrocarbons and will not react with the non-alkane selective oxidizer.

A system and method for remediation of asphaltene-induced fouling of an oil-bearing formation is provided wherein an asphaltene solvent comprising at least 75 mol % dimethyl sulfide is introduced into an oil-bearing formation containing asphaltene deposits and the dimethyl sulfide is contacted with the asphaltene deposits.

The invention relates to asphaltene deposition solid inhibitor in the exploitation of light oil which can effectively reduce and control asphaltene to gather and deposit in the light oil exploitation process, which is used on the crude oil exploitation, and can solve the problems of asphaltene deposition and precipitation in the light oil exploitation process. The technical scheme is that the inhibitor is formed by high-pressure polyethylene, diesel fuel and other auxiliary agent, and the product of asphaltene deposition solid inhibitor can be obtained through conducting molten agglutination reaction for 20-60% high-pressure polyethylene, 10-40% diesel fuel and 20-40% other auxiliary agent which comprises three medicaments of polyoxyethylene ether, sodium dodecylbenzene sulfonate and 2,6-ditrertiarybutyl p-methyl phenyl under the temperature of 100-130 DEG C to form even mixture before molding. The product can be direct thrown into drug-carrying container or be thrown by means of a drug-adding pipe, is slowly released as the scouring of bottom hole oil stream, which can effectively inhibit the gathering and growth of asphaltene, solves the problem of pipe column plugging-up problem in well, and has the advantages of high inhibiting efficiency, long cycle, small additive dose and low cost.

A composition for removing paraffin, wax, or asphaltine deposits from the surface of a crude oil transmission system, such as a downhole tubular, a pipeline, or a surface tank, includes an aqueous sodium hydroxide solution containing from 18% to 25% by weight sodium hydroxide. The composition further includes an acetic acid solution containing from 30% to 55% by weight acetic acid compared to the sodium hydroxide, and a liquid aromatic hydrocarbon having from 6 to 10 carbon atoms and from 15% to 40% by weight compared to the sodium hydroxide. According to the method of the invention, the aqueous sodium hydroxide solution may be metered in a downhole tubular or a pipeline separate from the acetic acid solution, such that heat generated by the mixed composition is generated within the downhole tubular or the pipeline.

The invention provides an oil-soluble asphaltene dispersing blockage remover. In terms of the total weight of the dispersing blockage remover, the dispersing blockage remover is prepared from the following raw materials: 10-20% of aromatic hydrocarbon, 35-45% of acetone, 15-20% of organic acid salt, 5-18% of acyclic mixed ester, 5-20% of ionic surfactant and 5-15% of oil-soluble penetrant. Compared with the existing asphaltene dispersing blockage remover, the dispersing blockage remover has an open cup flash point above 65 DEG C, and is good in safety performance, and has the advantages of simple preparation process, low price, high asphaltene deposit blockage removing efficiency, low dosage, no organic chloride and the like. The oil-soluble asphaltene dispersing blockage remover is capable of the blockage problems of colloids, colloid and partial wax and thus applicable to removing the blockage in an oil-well exploitation process, and also has excellent blockage prevention effect.

Disclosed are methods of determining the effectiveness of an asphaltene deposition inhibitor in oilfield applications. Such methods typically comprising the steps of introducing an oil well fluid into a microfluidic / millifluidic system; introducing a mixture of an asphaltene deposition inhibitor and carrier into the microfluidic / millifluidic system; introducing a precipitating agent, typically comprising heptane, into the microfluidic / millifluidic system; and optionally introducing toluene into the microfluidic / millifluidic system; then observing the presence or absence of asphaltene aggregation within the microfluidic / millifluidic system.

The invention discloses a blocking remover and a preparation method thereof. The blocking remover comprises following raw materials: Brevibacillus borstelensis biosurfactant fermentation liquid and hydrophobic nano silicon dioxide, and an emulsifier, an anti-scaling agent, an anti-swelling agent and a cosolvent can also be contained. The preparation method of the blocking remover comprises the following steps: firstly, adding the biosurfactant fermentation liquid, the emulsifier and the cosolvent into a reaction container, heating, and uniformly stirring; secondly, adding the anti-scaling agent and the anti-swelling agent into the solution obtained in the former step, and stirring for dissolving; and finally, continuously heating a prepared solution, adding hydrophobic inorganic nanoparticles into the reaction container, and uniformly stirring. The blocking remover has low oil-water interfacial tension, can effectively strip and emulsify residual oil and colloidal asphaltene deposits in a medium-low permeable layer to form a low-viscosity emulsion, remove organic blocking, resist hypersalinity, can be completely degraded by microorganisms, and is green and environment-friendly.

An apparatus for separation of asphaltenes from an oil-containing fuel, has a mixing element for intensive mixing of the oil-containing fuel with a solvent to form a solution supersaturated with asphaltenes, a vessel for reducing the oversaturation by depositing the asphaltenes out of the supersaturated solution, a growth zone formed within the vessel for growth of asphaltene particles present via the asphaltenes separated out of the supersaturated solution, and a classifying unit connected in terms of flow to the vessel for separation of the asphaltene particles grown in the growth zone in terms of their particle size, wherein the vessel is formed and set up such that a stream containing asphaltene particles circulates between the mixing element and the growth zone of the vessel. A corresponding process has a stream containing asphaltene particles that circulates between the mixing element and the growth zone of the vessel.

The invention relates to an emulsion type crude oil viscosity-reduction drag reduction agent applied to high-wax-content pure oil pipe transportation. The emulsion type crude oil viscosity-reduction drag reduction agent mainly solves the problems that in the prior art, wax crystallization of a pipe network exists and wax asphaltene deposition of a pipe wall are serious in winter, and consequently the pipe transportation capability is greatly lowered, and safety transportation of crude oil is affected by return pressure rising. The emulsion type crude oil viscosity reduction and drag reduction agent is prepared from, by weight, 20-30% of macromolecule terpolymer, 20-35% of polyolefin drag reduction agent, 20-40% of higher alcohol, 5-10% of compound emulsifier and 1-5% of emulsion stabilizer. The emulsion type crude oil viscosity-reduction drag reduction agent can be rapidly dissolved into crude oil, so that the viscosity of the crude oil is reduced, the friction resistance of the crude oil is reduced, return pressure is reduced, and the pipe transportation capability is improved.

The invention provides a method or dynamically measuring the precipitation amount of asphaltene generated through CO2-crude oil action. The method comprises the steps of injecting crude oil into a reaction kettle through a crude oil piston container by using a first ISCO pump; introducing CO2 into the reaction kettle through a CO2 piston container by using a second ISCO pump and controlling the pressure intensity of the CO2 by using the second ISCO pump; observing an image of a crude oil-CO2 layer in real time through a CCD camera and a computer and measuring the area of asphaltene precipitation and the size distribution of particles by using image analysis software, measuring the precipitation amount under the condition of a small amount of reservoir through an indirect measurement method of the asphaltene precipitation amount; and calibrating an asphaltene precipitation image obtained in a previous experiment through the measured values and building a linear relationship between the precipitation coverage ratio and the asphaltene precipitation amount in the image.

The invention relates to a low-permeability sandstone reservoir composite polymer type profile control agent and its application method, which relate to the field of oilfield applied chemistry. The present invention injects low-permeability sandstone reservoirs in the form of double slugs. The pre-slug is a multi-molecular compound polymer, which can be combined with insoluble suspended matter particles in the reservoir to form a polymer with a molecular coil structure around the core. Selective plugging of micro-fractures and large pores in the reservoir; the rear slug is a low-viscosity compound polymer, and an appropriate amount of clay stabilizer and surfactant is added to control and flood unplugged areas, which can suppress low-viscosity The phenomenon of clay swelling in seepage sandstone reservoirs can improve the deposition of wax, colloid and asphaltene near the wellbore; the invention can improve the heterogeneity of reservoirs, increase the follow-up water flooding sweep coefficient, and suppress dead oil areas in low-permeability sandstone reservoirs Formed to improve the disadvantages of traditional oil recovery methods such as low recovery rate and poor economic benefits of low-permeability sandstone reservoirs.

The present invention relates to a method for inhibiting the asphaltene deposition damage during a hypotonic reservoir carbon dioxide flooding process through a nanometer fluid. The method comprises: simultaneously injecting carbon dioxide and a nanometer fluid into a hypotonic oil reservoir or alternatively injecting carbon dioxide and a nanometer fluid into a hypotonic oil reservoir. According to the present invention, through the injection of the nanometer fluid, the nanoparticles in the nanometer fluid can effectively adsorb asphaltene so as to prevent the damage on the reservoir due to the deposition of the asphaltene on the sand.

The invention belongs to the technical field of petrochemical engineering, and particularly relates to a nanoparticle for inhibiting or eliminating heavy oil asphaltene deposition and a preparation method thereof. The nanoparticle is a nanoparticle mixture of one or more of nano-Ni<2>O, nano-Fe<2>O<3>, nano-CoFe<2>O<4>, nano-Fe<3>O<4>, nano-sodium iron silicate (NaFeSi<2>O<6>), nano-MoO<3>, Co<3>O<4>, nano-WO<3>, nano-Al<2>O<3>, nano-ZrO<2>, nano-ZnO, nano-CuO, nano-TiO2, nano-SiO2, amine-modified hectorite nanoparticle, modified fly ash nanoparticle and modified apatite nanoparticle. The preparation method for the Ni<2>O particle is as follows: a NiO nanoparticle is prepared in situ, 2.5ml of 4M aqueous nickel nitrate solution is added into 50ml of oil matrix, phase separation does not take place after mixing, the oil matrix is of a single phase, and heat treatment is carried out under 300 DEG C in a closed reactor unit for 12 hours.

The invention relates to an asphaltene deposition inhibitor composition which includes plant oil, a heteroatom compound containing nitrogen, sulfur and oxygen, which is represented as the general formula (I): CnHmSN2O2, and a synergist represented as the general formula (II): C<t>F<2t+1>C6H4SO3X. The invention also relates to a preparation method of the inhibitor composition. In the method, raw materials are biodegradable, are environment-friendly and are low in cost. The invention further relates to an application of the inhibitor composition in crude oil exploitation and gathering and transportation. The asphaltene deposition inhibitor composition is higher than 87% in asphaltene inhibition rate, can significantly inhibit separation and deposition of the asphaltene in crude oil, and has great market prospect.

The invention relates to a U-shaped bubble ring generation device and method. The U-shaped bubble ring generation device consists of a bubble generation portion and a bubble ring generation portion; agrid is arranged at the tail end of the bubble generation portion, a drainage plate is arranged in the middle of the bubble ring generation portion, bubble liquid is fully in contact with air to generate bubbles, bubbles are uniformly distributed in a pipe through the grid, heavy crude oil enters from the oil tube, the bubbles enter an annular cavity, after the flow of the bubbles is stabilized by the drainage plate, a bubble thin layer which is stable and uniform is formed, the heavy crude oil is isolated from a tube wall to obtain an annular flow which takes the bubbles as an outer ring, and the heavy crude oil which is attached to the tube wall is reduced; and the heavy crude oil delivering resisting is reduced, deposition of wax crystals and asphaltene on the bottom of a pipe are relieved, and recovery and transportation energy consumption for the heavy crude oil is reduced favorably; and when transportation stops, the bubbles can be separated into a bubble layer and a water layerin a short time, by the bubble layer, the heavy crude oil is prevented from being in contact with the upper surface of the tube wall, the water layer prevents the heavy crude oil from being in contact with the lower surface, and restarting of a pipe system is facilitated.

The invention provides an experimental device for dynamically measuring the asphaltene precipitation amount under a CO2-crude oil action. The experimental device comprises a reaction kettle and a microscope positioned above the reaction kettle, wherein a CO2 piston-type container is connected to the side surface of the reaction kettle, and a crude oil piston-type container is connected to the other side surface of the reaction kettle; the microscope is connected with a computer. The experimental device has the beneficial effects as follows: the experimental device is simple in device, low in cost and convenient to operate, and an image of a crude oil-CO2 layer can be observed through a CCD camera and the computer in real time; under high pressure, asphaltene precipitating on an acrylic plate can be clearly seen, and particularly a critical pressure point at which the asphaltene precipitates out from a CO2-saturated crude oil layer can be observed; the area of asphaltene precipitates and the size distribution of particles can be measured by using image analysis software, and the precipitation amount under a condition of a small amount of reservoir is measured by an indirect asphaltene precipitation amount measuring method.

The invention relates to a quantitative evaluation device for rock permeability damage caused by crude oil asphaltene and application of the quantitative evaluation device, and belongs to the technical field of experimental equipment for oil exploitation. The device comprises a constant-speed constant-pressure micro pump, a high-pressure formation oil container, a high-pressure kerosene container,a rock core holder, a filter and a vacuum pump, wherein the constant-speed constant-pressure micro pump is connected with one end of the high-pressure formation oil container and one end of the high-pressure kerosene container, the other end of the high-pressure formation oil container is connected with an inlet of the rock core holder through a back pressure valve a; the other end of the high-pressure kerosene container is connected to an inlet of the rock core holder; an outlet of the core holder is connected with the filter and the vacuum pump; the filter is connected to a back pressure valve b; the back pressure valve a and the rock core holder are connected with a hand pump a; and the back pressure valve b is connected with a hand pump b. According to the present invention, the rockpermeability change amount caused by crude oil asphaltene precipitation and the adsorption amount of asphaltene in the rock core can be measured under the stratum temperature condition, and the experimental data support is provided for evaluation of heavy oil reservoir damage caused by asphaltene deposition.