124 results about "Black oil" patented technology

Integrated surface-subsurface modeling has been shown to have a critical impact on field development and optimization. Integrated models are often necessary to analyze properly the pressure interaction between a reservoir and a constrained surface facility network, or to predict the behavior of several fields, which may have different fluid compositions, sharing a common surface facility. The latter is gaining a tremendous significance in recent deepwater field development. These applications require an integrated solution with the following capabilities: * to balance a surface network model with a reservoir simulation model in a robust and efficient manner. * To couple multiple reservoir models, production and injection networks, synchronising their advancement through time. * To allow the reservoir and surface network models to use their own independent fluid descriptions (black oil or compositional descriptions with differing sets of pseudo-components). * To apply global production and injection constraints to the coupled system (including the transfer of re-injection fluids between reservoirs). In this paper we describe a general-purpose multi-platform reservoir and network coupling controller having all the above features. The controller communicates with a selection of reservoir simulators and surface network simulators via an open message-passing interface. It manages the balancing of the reservoirs and surface networks, and synchronizes their advancement through time. The controller also applies the global production and injection constraints, and converts the hydrocarbon fluid streams between the different sets of pseudo-components used in the simulation models. The controller's coupling and synchronization algorithms are described, and example applications are provided. The flexibility of the controller's open interface makes it possible to plug in further modules (to perform optimization, for example) and additional simulators.

The invention discloses a method for modifying biomass cracking oil to modified biomass oil through esterification, etherification and quality-improvement. The method comprises the following: step one, according to the proportion that the mass ratio of biomass cracking oil to benzyl chloride to alkaline solution to low-carbon alcohol is 100 to 80-100 to 40-80 to 10-20; and the biomass cracking oil, the low-carbon alcohol, the benzyl chloride and the alkaline solution are added into a reaction kettle, are heated at the temperature of between 90 and 110 DEG C to an infinite reflux state and react for 5 to 8 hours. Step two, after the infinite reflux reaction is finished, the mixture is cooled, condensed and layered; the lower layer is clear and transparent aqueous solution; black oil phase on the upper layer is separated, and is distilled under the condition that the temperature is 80 DEG C and the pressure is 10 kilopascal; low-carbon alcohol and water in oil phase are removed; the residual mixture is distilled under the condition that the temperature is between 130 and 150 DEG C and the pressure is 10 kilopascal; the unreacted benzyl chloride is reclaimed to obtain a product of black viscous liquid; and according to the proportion that the mass ratio of the product to ethanol is 3 to 1, the black viscous liquid is diluted and dissolved to obtain the modified biomass oil of which the PH value is between 5 and 7, the density is between 1.0 and 1.1 g / cm<3>, the water content is between 0.5 and 1.0 percent, the thermal value is between 25.0 and 35.0 kJ / g and the viscidity is between 135 and 150 mm<2> / s.

An ink set includes an oil-based ink composition containing a metallic pigment; and at least one oil-based ink composition selected from the group consisting of a chromatic color ink composition containing a chromatic color oil dye, a black ink composition containing a black oil dye, and a colorless and transparent ink composition that does not contain a colorant.

Method using <<Black Oil>> type modelling for predicting, as a function of time, the detailed composition of fluids produced by an underground reservoir under production, combined with a delumping stage allowing detailed thermodynamic representation of the reservoir fluids.The input data entered for the model are the thermodynamic parameters of the fluids such as viscosity, volume factor, density, gas-oil dissolution ratio, etc. (in form of charts, and / or by correlation, as a function of the pressure, of the temperature if it varies) and, if need be, an additional parameter keeping a memory of the composition of the gas such as, for example, the density of the gas), as well as data relative to the variations, as a function of the same <<abscissas>>, of the phase parameters required for delumping, without the latter being used during the <<Black Oil>> simulation of the flows.Application: predictive profiles of the detailed composition of hydrocarbons produced by a reservoir for example.

Methods for treating formations bearing brine and at least one of black oil or volatile oil using a composition containing a nonionic polymer and solvent. The solvent at least one of solubilizes or displaces at least one of brine or oil in the formation. Methods for making a composition for treating a formation bearing brine an at least one of black oil or volatile oil are also disclosed.

The invention investigates the effects of reservoir heterogeneity on IPR curves for horizontal wells drilled in heterogeneous solution gas drive reservoirs. To achieve the desired objective, a commercial simulator Eclipse is utilized to develop IPRs for horizontal wells producing oil from solution gas drive reservoirs. Firstly, a simulation model is developed where a base case is considered with typical rock, fluid and reservoir properties using a black oil model. Dimensionless IPR curves are generated by obtaining a set of points relating to flowing bottom-hole pressures to oil production rates. The effects of several reservoir and fluid properties such as bubblepoint pressure, oil gravity, residual oil saturation, critical gas saturation, initial water saturation, porosity and absolute permeabilities on the calculated curves are investigated.Reservoir heterogeneity is included in the simulation model by incorporating a semi-variogram function. Finally, a new single empirical IPR model is obtained for horizontal wells producing oil from heterogeneous solution gas drive reservoirs suitable for systems with different reservoir permeability. The new empirical IPR model is then compared to published correlations and is found to have a small and acceptable average absolute error of less than 2%. Furthermore, the invention also shows that bubble point pressure has significant effect on dimensionless IPR curves. However, plots for other properties indicate that although the curves are not identical, they are similar in shape and demonstrate much less variance than the bubble point pressure plot. Therefore, these properties have only a minor effect on calculated, dimensionless IPR curves.

The invention discloses a method for raising quality of biomass pyrolysis oil by reactive extraction. By selecting reactive extracting agent, two unit operations of reaction and extraction are carried out simultaneously, and the method comprises: a first step, according to a proportion of the biomass pyrolysis oil to low-carbon alcohol to a catalyst by mass being 100:40-100:2-10, adding the biomass pyrolysis oil, the low-carbon alcohol and the catalyst into a reaction kettle, dripping hydrogen peroxide water solution into the reaction kettle at a temperature of 80 DEG C according to a proportion of the biomass pyrolysis oil to oxidant by mass being 100:20-60, and then heating the mixture for reacting for 5 to 8 hours at a temperature of between 80 and 100 DEG C; and a second step, after total reflux reaction is ended, cooling, condensing and layering the mixture, and obtaining clear and transparent water solution on the lower layer; and separating a black oil phase on the upper layer, distilling and reclaiming the unreacted low-carbon alcohol in the oil phase at a temperature of 80 DEG C under 10KPa, obtaining the black sticky liquid which is not distilled, namely a product, and diluting and dissolving the product by methanol according to a proportion of the product to the methanol by mass being 4:1 to obtain the modified biological oil, wherein the pH is 4 to 6, the density is 1.0 to 1.1 g / cm<3>, the water content is 0.5 to 2.0 percent, the thermal value is 25.0 to 30.0 kilojoules per gram, and the viscosity is 35 to 40 mm<2> / s at a temperature of 30 DEG C.

The invention provides a heterogeneous catalysis used for preparing cyclohexanone and cyclohexanol by catalytic oxidation of cyclonexane and a preparation method thereof. The technical process thereof is that: according to a certain proportion, a carrier is mixed with a certain proportion of active metal nitrate solution. The carrier is aluminosilicate molecular sieve or silicon dioxide. The active metal is one or more transition metal element of IVB-VIIIB Group. The mixture is stirred for 1 to 3 hours at room temperature and then treated with standing impregnation for 5 to 12 hours, or stirred back flow at boiling temperature for 5 to 8 hours. The catalyst with active metal is obtained by that a supernatant is removed and a filter cake is dried at 80 to 120 DEG C, baked at 400 to 600 DEG C for 2 to 6 hours. The catalyst of the invention has the advantages of low price, gentle reaction condition, and high conversion efficiency of cyclonexane; cyclohexanol and cyclohexanone are with good selectivity; no carbon dioxide or black oil is generated from the reaction process; the catalyst is easily separated from reaction system after reaction.

The invention relates to a lubricating oil composition for a marine medium-speed cylindrical diesel engine, which comprises the following components in percentage by weight: 12-22% of high temperature detergent, 1-3% of ashless dispersant, 0.5-1.5% of antioxidant, 0.002-0.005% of antifoam agent and the balance of base oil, wherein the high temperature detergent is compounded from the following components in percentage by weight: 30-70% of high base number alkyl calcium salicylate and 30-70% of high base number sulfurized calcium alkyl phenate; the ashless dispersant is bis-succinimide; the antioxidant is zinc dialkyl dithiophosphate; and the antifoam agent is methylsilicone oil. The invention can satisfy the operational requirements of advanced marine medium-speed cylindrical piston diesel engine oil; and the lubricating oil composition has the function of inhibiting the generation of black oil sludge, reduces the faults of the medium-speed cylindrical piston diesel engine due to bad lubrication and the like, prolongs the service life of the engine, and has the advantages of accessible raw materials, simple production technique and low cost.

This invention relates to oil refining, more particularly to a composition of a heavy fuel oil for use in marine power units and boiler plants. The fuel comprises, in percent by weight: an extract from the selective extraction of gas oil—(3-5), heavy catalytic cracking gas oil—(3-10), vacuum gas oil—(5-10), tar or topped residuum—(3-10), straight-run black oil—(10-20), viscosity breaking residue of heavy oil fractions—the rest. The selected combination of the components and their ratio may for example, result in a stable heavy fuel oil having improved viscosity properties. The inclusion of the above components into the fuel composition may also make it possible to expand the production of heavy fuel oils produced.

A well-based production simulator is provided, which predicts the quantity of fluids produced per phase, per well and per time as a function of operational field parameters. The invention combines a petroleum reservoir simulator with a petroleum production facility simulator to obtain an integrated model to quickly and accurately forecast production on a well-by-well basis. The efficiency of the petroleum reservoir simulator is derived from its unique formulation, which solves for the production well's flow rate rather than the petroleum reservoir pressure. The simulator properly represents viscous, capillary and gravity forces, as well as complex fluid descriptions, including three-phase black-oil formulations.

The invention discloses a self-adhesion label for laser etching and a preparation method of the self-adhesion label for laser etching. The label comprises a black face layer, a white bottom layer, a transparent adhesive layer and a strippable layer, wherein laser etching is conducted on the surface of the black face layer; the white bottom layer is bonded under the black face layer tightly in a face-to-face mode; the transparent adhesive layer is coated to the lower surface of the white bottom layer; the strippable layer is laminated to the lower surface of the transparent adhesive layer. The black face layer is formed by coating and drying black oil ink paste, wherein the black oil ink paste comprises, by weight, 40-60 parts of polyurethane resin, 15-30 parts of black color paste, 8-20 parts of amino resin and 10-25 parts of solvents. According to the self-adhesion label for laser etching and the preparation method, resin and cross-linking agents are screened and react with each other in a high-temperature cross-linking film forming mode to form a film coating, the film coating has the advantages of being excellent in high-low temperature resistance, solvent resistance, weather resistance, wear resistance and scraping resistance and good in bonding performance, necessarily destroyed when being stripped and capable of achieving the anti-fake function and being used for laser etching, and the preparation method is low in preparation cost and high in production flexibility.

The invention provides a low-permeability deformation medium nonlinear seepage numerical simulation method based on a boundary layer. The low-permeability deformation medium nonlinear seepage numerical simulation method comprises the steps: a reservoir nonlinear seepage model based on the boundary layer is built; according to the relation that the reservoir deformation medium permeability is changed with effective stress, a reservoir pressure sensitive model is built by combining with the effective stress coefficient; based on a capillary communicator device, the low-permeability rock core static starting pressure is measured, and the minimum starting pressure gradient of a rock core is obtained; the influences of the boundary layer effect, the pressure sensitivity and the minimum startingpressure gradient are comprehensively considered, and a deformation medium nonlinear seepage mathematical model based on the boundary layer is built; and transforming is conducted based on a traditional black oil numerical simulation software platform, and low-permeability nonlinear seepage numerical simulation is achieved. According to the low-permeability deformation medium nonlinear seepage numerical simulation method based on the boundary layer, depicting for the rock core seepage characteristic is truly and comprehensively reflected, the high reliability and accuracy are achieved, and the effective technical support is provided for adjusting and optimizing of the low-permeability oilfield development scheme.

The invention provides a method and a device for simulating black oil reservoir. The method comprises the following steps of according to component fluid seepage parameters, establishing a component model for describing a black oil reservoir fluid seepage rule; according to the required data for simulating black oil based on the black oil model, performing numerical discretization on the component model, so as to obtain a component number model based on a discrete network of a black oil reservoir geological model; according to fluid PVT (pressure-volume-temperature) data, establishing a component phase balance parameter list; according to the component phase balance parameter list and the evaluation values of the component fluid seepage parameters, performing flash calculation, so as to obtain the fluid phase state and applicable physical parameter; according to the fluid phase state and applicable physical parameter, adjusting the component number model; according to the evaluation values of component fluid seepage parameters and the adjusted component number model, calculating, so as to obtain the oil reservoir pressure change value and the saturation change value of each fluid phase; judging whether the oil reservoir pressure change value and the saturation change value of each fluid phase are convergent or not; when the oil reservoir pressure change value and the saturation change value of each fluid phase are convergent, calculating, so as to obtain the oil reservoir pressure and the saturation of each fluid phase. The method has the advantage that the extendability of oil reservoir number simulation architecture is improved.

A method for numerical simulation of condensate oil damage of different well types in a narrow channel gas reservoir includes such steps as dividing pseudo-component of gas well flow and phase state fitting to obtain fluid PVT data required by component model of gas reservoir; establishing a numerical simulation geological model according to the reservoir characteristics and boundary conditions ofnarrow channel gas reservoirs; by defining dimensionless fracture conductivity and grid size series refinement, simulating the fractures and importing the PVT data by numerical simulation software;by simulating the distribution of condensate saturation in different development wells, obtaining the law of condensate precipitation in different development wells of narrow channel gas reservoirs; establishing a black oil model to quantitatively characterize the condensate oil damage of different well types by comparing the cumulative gas production reduction range of gas wells. The invention can finely simulate hydraulic fracturing fractures, and can qualitatively and quantitatively evaluate the influence of condensate oil precipitation of different development well types on gas well productivity of narrow channel gas reservoirs.

A system and method whereby on-line cleaning of black oil heater tubes and delayed coker heater tubes may be effectuated by injecting a high pressure water charge through the tubes during normal process operations so as to prevent tube fouling and heater downtime. The high pressure water charge begins the on-line cleaning process once it enters the heater tube by undergoing intense boiling and evaporation. The cleaning occurs by two methods—a scrubbing action and a shocking action. The scrubbing action occurs because of the complete turbulence caused by the water charge's intense boiling within the heater tubes. The shocking action is caused by the expansion and contraction of the heater tubes resulting from the colder water charge flowing through the heater tubes which is then followed by the hotter process fluid flowing through the heater tubes.

The invention provides a crack detection method of roll dressing, the steps of which is that: scrapping the surface of the rolls after processing; connecting magnetic particle detector to the electricity; spraying black oil magnetic suspension on the defectoscopy of the roll surface; opening the switch of the magnetic particle detector and adjusting the angle of the two contact heads and being positioned at the black oil magnetic suspension sprayed. After observation of the roll surface, magnetic powder can be found at the crack if crack exists; then carrying on flaw inspection in a plurality of different places on the roll surface, the process should be continued if crack is observed until no crack is detected. The invention has the beneficial effects that tiny crack on the roll surface is efficiently detected after roll processing by the detection method. Then appropriate procession can be continued which not only cuts down the loss during raising the processing capacity blindly, but also avoiding the short service life of rolls caused by not eliminating the cracks completely.

The invention relates to an oil reservoir simulation method. The method relates to a region division device, a mesh generation device, a mapping device, an interface processing device and a matrix construction device and a matrix solving device, wherein the region division device is used for dividing an oil reservoir into multiple regions, and the multiple regions at least include a component region and a black oil region; the mesh generation device is used for mesh generation of each region and forming interfaces between the regions; the mapping device is used for mapping the component region and the black oil region to intermediary material to establish correlation; the interface processing device is used for processing the interfaces according to the law of conservation of mass; the matrix construction device is used for constructing a uniform matrix according to the mapping results of the multiple regions and the interface processing results; the matrix solving device is used for solving the uniform matrix. Through the method, data can be exchanged between different regions in real time in simulation, discontinuity of fluid between the regions is eradicated, simulation efficiency can also be improved, and the expansibility of a following simulator is improved.

The invention discloses a coal slurry oil fuel engine oil composition. According to the invention, the composition adopts polyinternalolefins and oil-soluble polyether as base oil combined with multiple complex additives including a wear-resistant agent, an antioxidant preservative, an anti-foaming agent, a viscosity index improver, a metal deactivating agent, a friction improver, an antirust agent, a clearing agent, a dispersing agent, an oiliness additive, an antioxidant, and an antiwear agent. The engine oil composition has excellent clearing and dispersion effects, and is capable of preventing adhesion of a piston ring and keeping an engine clean; good viscosity-temperature characteristics, excellent base value retentivity and oil viscosity ascending ability can inhibit the generation of black oil sludge so that the engine is relatively clean; the coal slurry oil fuel engine oil composition has excellent high-temperature oxidization resistance stability, high-shear stability and rubber compatibility, good low-temperature starting property and excellent fuel economy and no corrosion and rustiness to moving components, and is capable of ensuring that the oil products keep enough oil film strength and reducing wear and evaporation loss.

The invention relates to oil refining, more particularly to a composition of a light fuel oil for use in medium-speed diesel engines of marine power units. The inventive light fuel oil comprises, in % by wt.: black oil—(4-10), tar—(2-10), light catalytic cracking gas oil—(10-30), heavy catalytic cracking gas oil—(5-10), a straight-run diesel fuel—(8-10), a viscosity breaking residuum of a heavy oil fraction—the rest. The selected component ratio will enable to improve the fuel stability in transportation and storage, expand the range of available fuels and increase the production volumes of quality fuels, while rationally using poor-quality products readily available at refineries.

The invention relates to a PVC paint having a coating manner of a dip coating or a sprinkle coating. The PVC paint comprises the following four components by weight percent: 50-55% of resin liquid, 15-10% of liquid organic glass, 2%-1% of pigment mill base and 33-34% of a mixed solvent, wherein the resin liquid comprises 15-20% of PVC resin powder and 85-80% of cyclohexanone; the pigment mill base is red and black oil-soluble pigments and the mixed solvent comprises 55-58% of xylene, 40% of cyclohexanone and 5-2% of dibutyl phthalate. Each component is fed in proportion. The coating method can adopt the dip coating, namely, a product is immersed into the paint, lifted and suspended, during draining, the paint forms a film while downwards flowing, the color of the product is different along with the amounts of paint remained in the surface of the product and a three-dimensional visual effect which naturally changes along with the change of patterns is given; the coating method can also adopt the sprinkle coating, namely, the product is positioned in a rack, to-be-coated one side of the product is not needed to downwards face, the paint is sprinkled from the top of the product and the same coating effect as that of the dip coating is achieved.

The invention provides a printing method for a pattern having a 3D visual effect on a mobile phone lens. The printing method comprises the following steps that firstly, dots are printed in a silk screen mode, wherein one layer of black dots is printed on the whole surface of one side of plane glass of the mobile phone lens by using a dot-shaped composite wire mesh as a screen printing plate and using a mixture containing black oil and gloss oil and gloss oil as ink; the diameter of each dot is 0.2-0.6 mm, spacing between the dots is 0.6-0.9 mm, and the mesh number of the screen printing plate is 400-500 mesh; secondly, CD grain is printed in a silk screen mode, wherein one layer of CD grain is printed on the whole surface of the dot layer obtained from the first step by using a CD grain composite steel mesh as a screen printing plate and using gloss oil as ink; the line diameter of the CD grain is 0.1-0.15 mm, line grain spacing is 0.1-0.4 mm, and the mesh number of the screen printing plate is 500-650 mesh; thirdly, silk screen printing is performed by using white oil; fourthly, silk screen printing is performed by using black oil. According to the printing method, the mobile phone lens with the pattern having the 3D visual effect can be manufactured through 2D plane glass.

The invention discloses a cedrela sinensis trunk obliquely-pulled dwarfing and compact planting cultivation method, and belongs to the field of plant cultivation. According to the method, red oil cedrela sinensis seedlings or black oil cedrela sinensis seedlings which are excellent in seed source, 1-2 meters in seedling height, 1-2 years in seedling age, strong in growth and free of plant diseases and insect pests are selected, and the seedlings are planted in a double-line large-line-spacing and small-row-spacing cultivation mode. After 2-3 times of sprout picking in the current year, obliquely pulling is carried out on trunks in a binding method so as to promote the seedlings to grow more lateral branches; the seedlings are cultivated in multiple-main-branch dwarfing tree shapes and trees are controlled at a reasonable height by combining the pruning technology. According to the method, nutrient consumption of tree bodies can be reduced, the yield of cedrela sinensis sprouts can be improved, and the cultivation period of dwarfing and compact planting of tree shapes can be shortened; meanwhile, the picking difficulty of the cedrela sinensis can be effectively reduced, work efficiency is improved, and probabilities of plant diseases and insect pests on the tree bodies can be reduced to a certain extent.

The invention discloses a method for establishing an ecological artificial pasture on a black oil beach, which includes: firstly, selecting locally introduced and domesticated local grass-seeds; and secondly, according to the ecological and biological characteristics of forage grass and the principle of species niche in communities, mixing Elymus nutans, Leymus and Puccinellia tenuiflora according to a certain proportion, mixing Elymus nutans, Leymus, Stipa penicillata and Roegneria thoroldiana according to a certain proportion, and mixing Elymus tangutorum, Qinghai Poa pratensis, Puccinellia tenuiflora, Stipa penicillata and Roegneria thoroldiana according to a certain proportion, so that utilization rate of environmental sources is increased, the established artificial vegetation is highly stable, and the ecological benefit is evident. The method is applicable to establishment of ecological artificial pastures on deteriorated grassland of all black soil beaches with soil thickness more than 15cm.

The invention discloses a method for converting black oil shale semi-coke into a white product. The method comprises the following steps of crushing oil shale semi-coke into powder, adding water, pressing into slices by using a roller press, and carrying out calcination in an air to obtain a solid product A; dispersing the solid product A in a hydrogen peroxide solution, adjusting the pH of the solution to be 3-6, and carrying out reaction at 50-90 DEG C for 1-2 hours; centrifuging reacted suspension to obtain a solid product B; dispersing the solid product B into an acid solution, carrying out stirring reaction at 80 DEG C for 1-2 hours, and carrying out centrifugal separation to obtain an acid pickling product C; and finally, carrying out calcination on the acid pickling product at 500-900 DEG C for 2 hours to obtain the oil shale semi-coke whitening product. According to the method, by virtue of an integrated process of rolling- calcinations-oxidization- pickling- re-calcination, black organic matters in the oil shale semi-coke are removed, and associated substances such as carbonate and iron pyrite are removed, so that the black oil shale semi-coke is converted into the white product, and the high-value application and application field of the semi-coke are expanded.

The invention relates to a numerical simulation method for replacing a gas-driven component model. The method comprises the following steps of: carrying out PVTi fitting on a target block fluid to obtain PVTi fitted fluid property data; establishing component mechanism models under different permeation rates, and obtaining change rules of a mixed-phase area during oil deposit gas-driven development under the different permeation rates; building a practical component model according to the PVTi fitted fluid property data; obtaining a block practical numerical simulation model according to the change rules of the mixed-phase area during the oil deposit gas-driven development under the different permeation rates; adjusting mixed-phase coefficients in the block practical numerical simulation model to ensure that the differences between the capacity indexes and pressure indexes of the practical component and the block practical numerical simulation model are not higher than 10%, and obtaining reasonable mixed-phase coefficient distribution of a target block; and building a Todd-longstaff practical model, carrying out calculation in the mixed-phase area by using a Todd-longstaff algorithm, and carrying out calculation outside the mixed-phase area by using a common black oil algorithm.

The invention discloses a coal water slurry blended fuel engine oil composition. Polyinternalolefins and castor-bsae dioctyl sebacate used as base oil are matched with multiple composite additives to obtain the composition. The composite additives comprise an antiwear additive, an antioxidant preservative, an antifoam agent, a demulsifying compound, a viscosity index improver, a metal passivator, a detergent agent, a dispersing agent, an antioxidant, an oily agent, a friction improver, a reinforcing agent and a rust inhibitor. The engine oil composition has excellent cleaning and dispersion effects, prevents the piston ring from sticking, and keeps the engine clean. Due to excellent viscosity-temperature characteristic, excellent alkali number retentivity, acid neutralizing capacity and demulsifying capacity, the engine oil composition can inhibit the black oil sludge from generation, so that the engine is cleaner. Due to favorable high-temperature oxidation stability, high shear stability, favorable rubber compatibility, favorable cold-starting property and excellent fuel economical efficiency, the engine oil composition can not corrode or tarnish the moving parts, ensures the oil product to maintain sufficient oil film strength, has better extreme-pressure abrasion resistance, and lowers the abrasion and engine oil consumption.

A method for assessing an inflow performance relationship for a horizontal well in heterogeneous solution gas drives reservoirs. A commercial simulator Eclipse is utilized to develop IPRs for horizontal wells producing oil from solution gas drive reservoirs. Firstly, a simulation model is developed where a base case is considered with typical rock, fluid and reservoir properties using a black oil model. Dimensionless IPR curves are generated by obtaining a set of points relating to flowing bottom-hole pressures to oil production rates. The effects of several reservoir and fluid properties such as bubblepoint pressure, oil gravity, residual oil saturation, critical gas saturation, initial water saturation, porosity and absolute permeabilities on the calculated curves are investigated. A new single empirical IPR model is obtained for horizontal wells producing oil from heterogeneous solution gas drive reservoirs suitable for systems with different reservoir permeability.

The invention discloses a diethoxymethane diesel engine oil composition. The diethoxymethane diesel engine oil composition is prepared by adopting class II base oil and pentaerythritol ester as base oil and cooperating with various composite additives. The diethoxymethane diesel engine oil composition comprises an anti-wear agent, an antioxidant preservative, an anti-foaming agent, a viscosity index improvement agent, a metal deactivating agent, a cleaning agent, a dispersing agent, an antioxidant and an oiliness agent. The diesel engine oil composition disclosed by the invention has excellent cleaning and dispersing effects, can be used for preventing a piston ring from sticking, has excellent viscosity-temperature characteristics, excellent alkali value retainability and acid neutralization capacity, can be used for inhibiting the generation of black oil sludge, ensures that an engine is cleaner, has good anti-high-temperature oxidation stability, high shear stability, rubber compatibility, good low-temperature startability and excellent fuel oil economical efficiency, can not cause corrosion to moving components, ensures that an oil product can maintain enough oil film strength, and can be used for reducing the wear.