Abstract: A new sliding sleeve relates to the technical field of oil and gas well completion and reservoir stimulation, comprising an upper connector, a lower connector, an outer housing, an inner sleeve and a shear pin. The upper connector and the lower connector are respectively connected to two ends of the outer housing, and the inner sleeve is locked in the outer housing via the shear pin, wherein a flow guiding hole is provided in the outer housing, and the inner sleeve can open or close the flow guiding hole, wherein at least two grooves for engaging with at least two corresponding tooth-shaped elements on a sliding sleeve opening tool are disposed along an axial direction in the inner sleeve, and wherein an erosion-resistant ring is embedded in the groove, and an inner diameter of the erosion-resistant ring is larger than or equal to an inner diameter of the inner sleeve.

Abstract: Provided are an ethylene-vinyl alcohol copolymer composition and a preparation method therefor. The composition includes an ethylene-vinyl alcohol copolymer, an alkali metal element and a carboxyl-containing material, characterized in that the carboxyl-containing material includes a mono-saturated carboxylic acid and a carboxylic acid containing a carbon-carbon double bond. The present invention can improve the yellowing resistance of an EVOH resin composition by making the EVOH resin composition contain both acetic acid and a carboxylic acid containing a carbon-carbon double bond. After heat treatment at 210° C. for 0.5 h, the yellowing index YI does not exceed 20 and the increase does not exceed 15.

Abstract: A catalytic conversion process for producing gasoline and propylene includes the steps of 1) subjecting a feedstock oil to a first catalytic conversion reaction in a first catalytic conversion reaction device to obtain a first reaction product; 2) separating the first reaction product to obtain a propylene fraction, a gasoline fraction and a fraction comprising C4 olefin; 3) carrying out an oligomerization reaction on the fraction comprising C4 olefin in an oligomerization reactor to obtain an oligomerization product comprising C12 olefin, and optionally separating the oligomerization product to obtain a fraction comprising C12 olefin; 4) recycling the C12 olefin-containing oligomerization product or fraction to the first catalytic conversion reaction device, and/or sending the C12 olefin-containing oligomerization product or fraction to a second catalytic conversion reaction device for a second catalytic conversion reaction to obtain a second reaction product comprising propylene.

Abstract: Described are an ethylene-vinyl alcohol (EVOH) copolymer composition, and a preparation method therefor. The composition contains an EVOH copolymer, element potassium, and element sodium, wherein the mass ratio of element sodium to element potassium is 0.1:1 to 1:1. By controlling the contents of element sodium and element potassium in an EVOH resin composition to fall within a specific proportion range, the heat resistance of the resulting EVOH resin composition is greatly improved, the initial decomposition temperature can be increased to 370-400° C., the maximum decomposition temperature can be increased to 400-440° C., and thus EVOH resin can adapt to the process requirement for a higher processing temperature. Moreover, further adding acyl-containing carboxylic acid and a phosphorus-containing compound/boron-containing compound can improve the thermal yellowing resistance of the EVOH resin composition, where the value of the yellowing index (YI) after 5-hour thermal treatment at 150° C.

Abstract: An interconnector for connecting downhole instruments includes a male connector assembly and a female connector assembly. The male connector assembly has a first housing and a male rotatable connector that are connected together. The female connector assembly has a second housing and a female rotatable connector. The second housing is adapted to receive the female rotatable connector. The male rotatable connector has a first end having a plurality of cylinders that are sequentially and concentrically connected, and a second end adapted to receive a first plurality of electrical wires, and a first plurality of electrical contacts disposed on the plurality of cylinders. The female rotatable connector has a first end having a cavity having a plurality of steps adapted to receive the plurality of cylinders in the male rotatable connector, and a second end adapted to receive a second plurality of electrical wires.

Abstract: A process for producing para-xylene and ethylbenzene from C8 aromatics containing ethylbenzene includes the steps of sending C8 aromatics containing ethylbenzene to an ethylbenzene liquid-phase adsorption separation device, wherein a suction liquid containing ethylbenzene and a suction residual liquid are obtained after the adsorption separation, and the desorbents in the suction liquid and the suction residual liquid are removed to obtain ethylbenzene and a suction residual oil; sending the suction residual oil to a para-xylene adsorption separation device, and unadsorbed components are discharged as a raffinate from the adsorbent bed; the adsorbent bed is rinsed with a desorbent to desorb the para-xylene therein and obtain an extract; the desorbents in the extract and the raffinate are respectively removed to obtain para-xylene and a raffinate oil; sending the raffinate oil to a xylene isomerization device to carry out xylene isomerization, and the isomerization product is fractionated.

Abstract: A catalyst system for olefin polymerization contains a main catalyst and a cocatalyst. The cocatalyst contains a twelve-membered ring compound represented by formula (M). The catalyst system is suitable for preparing polypropylene products having high stereoregularity and low ash, and can regulate the melt index of the products within a wide range by adjusting the amount of hydrogenation. It is also suitable for copolymerization systems to improve the copolymerization yield.

Abstract: A process includes: cutting a hydrocarbon-containing feedstock oil into a light distillate oil and a heavy distillate oil; introducing the light distillate oil and a first catalyst into a down-flow reactor to produce a stream; subjecting the stream to a gas-solid separation to produce a first reaction hydrocarbon product and a first spent catalyst; or, introducing the stream into a fluidized bed reactor, and then subjecting to a gas-solid separation to produce a second reaction hydrocarbon product and a second spent catalyst; introducing a continuous catalyst, the heavy distillate oil and a second catalyst into an up-flow reactor, and then subjecting to a gas-solid separation to produce a third reaction hydrocarbon product and a third spent catalyst; separating out lower carbon olefins and light aromatics from reaction hydrocarbon products, separating out a light olefin fraction, and returning the light olefin fraction to the fluidized bed reactor or the up-flow reactor.

Abstract: Spun fibers and the use thereof, and a fiber spinning method. The fiber spinning method comprises extruding and spinning a spinning solution, and then sequentially subjecting a fiber precursor obtained by spinning to cooling formation, drying and stretching, wherein the method for the cooling formation comprises bringing the fiber precursor into contact with a fluid at a temperature of no more than ?10° C. Polyethylene spun fibers obtained by means of the fiber spinning method have a breaking strength of 40 CN/dtex or more and a modulus of 1400 CN/dtex or more.

Abstract: A halogen-containing compound represented by a formula I and a use thereof as a ligand of an ethylene oligomerization catalyst composition, an ethylene oligomerization catalyst composition comprising the halogen-containing compound, and an ethylene oligomerization method, ethylene trimerization method and ethylene tetramerization method using the catalyst composition are provided. Serving as the ligand of the ethylene oligomerization catalyst, the halogen-containing polymer may effectively improve the catalytic performance of a catalyst system, especially by displaying a significantly improved catalytic performance in an ethylene oligomerization reaction. The maximum catalyst activity may exceed 4×108 g·mol(Cr)?1·h?1, and the total selectivity of 1-hexene and 1-octene exceeds 92 wt %. In a C6 product, the content of 1-hexene may reach about 97%, and in a C8 product, the content of 1-octene may reach more than 98%.

Abstract: In a method for treating waste water containing ammonium salts, sodium sulfate crystal is obtained by freezing crystallization, then the pH value of the waste water is adjusted to a specific range, and next sodium chloride crystal and ammonia water is obtained by evaporation. Alternatively, the pH value of the waste water is adjusted to a specific range, then sodium chloride crystal and ammonia water is obtained by evaporation, and next sodium sulfate crystal is obtained by freezing crystallization. This method can recover ammonia, sodium sulfate, and sodium chloride from the waste water.

Abstract: An aluminophosphate molecular sieve SCM-18 has a schematic chemical composition, expressed on a molar basis, of Al2O3.n P2O5, in which n represents a phosphorus to aluminum molar ratio, and is in a range of about 0.8-1.2. The aluminophosphate molecular sieve has a unique X-ray diffraction pattern, and can be used as an adsorbent, a catalyst or a catalyst carrier.

Abstract: A reactive torque automatic balancing device for a screw drilling tool includes an upper joint (1); a core cylinder (9) having an inner chamber in communication with the screw drilling tool (305) located downstream, so that drilling fluid from the inner chamber of the upper joint (1) flows to the screw drilling tool (305) through the inner chamber of the core cylinder (9) to allow the screw drilling tool to perform drilling; a lower joint (16) fixedly arranged at a lower end of the core cylinder (9); and an automatic balancing assembly, which is arranged between an outer wall of the core cylinder (9) and an inner wall of the upper joint (1), and driven by hydraulic pressure generated by a part of the drilling fluid flowing through the inner chamber of the upper joint (1).

Abstract: A novel silicoaluminophosphate molecular sieve has a schematic chemical composition, expressed on a molar basis, of mSiO2·Al2O3·nP2O5, in which m represents the molar ratio of SiO2 to Al2O3 and is in a range of about 0.005-0.15, and n represents the molar ratio of P2O5 to Al2O3 and is in a range of about 0.7-1.1. The silicoaluminophosphate molecular sieve has a unique X-ray diffraction pattern, and can be used as an adsorbent, a catalyst or a catalyst carrier.

Abstract: The present disclosure relates to the technical field of oilfield chemicals, and discloses an acrylamide copolymer, wherein the acrylamide copolymer comprises a structural unit A, a structural unit B and a structural unit C, wherein the structural unit A has a structure shown in Formula (1), the structural unit B has a structure shown in Formula (2), and the structural unit C has a structure shown in Formula (3) and/or Formula (4); wherein R1 is methyl or H, R2 is —OH, —NH2, —COOH or C2-C12 alkyl, n is an integer between 0 and 6, and a, b and c are each independently selected from integers between 0 and 2.

Abstract: A phenol derivative of the present invention has a structure as represented by the formula (I): The functional groups are defined in the description. The phenol derivative can be used as the antioxidant in lubricating oil, lubricating grease, plastic, rubber, or can be used as the base oil of the lubricating oil and the lubricating grease and the antiwear additive of the lubricating oil and the lubricating grease.

Abstract: Disclosed is a hydrocracking catalyst, a preparation method and an application thereof. The catalyst comprises a carrier, silicon dioxide and active ingredients loaded on the carrier, wherein the carrier comprises Y molecular sieves and SAPO-34 molecular sieves. The preparation method of the hydrocracking catalyst comprises the following steps: (1) mixing materials comprising Y molecular sieves and SAPO-34 molecular sieves, and then subjecting the mixture to molding, drying and calcinating to obtain a carrier; (2) introducing silane and the active ingredients into the carrier prepared in the step (1), subsequently performing the drying and calcinating to prepare the hydrocracking catalyst. The catalyst prepared with the method can be used for hydrocracking reaction, thereby significantly increase yield of jet fuel.

Abstract: A method for producing an epoxyalkane includes the step of separating a stream containing an epoxyalkane and an extracting agent in a separation column having a column kettle reboiler. A part of a stream in the column kettle of the separation column enters an extracting agent purifier and is treated to obtain a gas phase light fraction that returns to the separation column and a liquid phase heavy fraction that is subjected to a post-treatment. The method can be used in the industrial production of an epoxyalkane.

Abstract: Processes for making phenol and xylenes from a phenols-containing feed are described. The processes involve transalkylation of alkylphenols to form phenol and alkylbenzenes. The phenol is separated from the alkylbenzenes, and the alkylbenzenes may be separated into benzene, toluene, xylenes, and heavy alkylbenzene streams. The benzene stream may be recycled to the transalkylation reaction zone. The toluene may be sent to a disproportionation reaction zone, and the product is sent back to the aromatic separation zone. The toluene can also be recycled to the transalkylation zone. The xylenes are separated into a p-xylene stream and a mixed xylene stream comprising m-xylene and o-xylene. The mixed xylene stream is isomerized and the isomerized product is sent back to the aromatic separation zone. The heavy alkylbenzenes are dealkylated and separated, with the aromatic stream being recycled to the aromatic separation zone.

Abstract: Described are a self-healing composition, and a preparation method for and an application of the composition. The composition is of a core-shell structure; the core contains a hydrogenated styrenic thermoplastic elastomer polymer and an inorganic filler; the shell contains a hydrophilic polymer; the composition has a density of 1.2-2 g/cm3, a water contact angle of no more than 90°, and a diesel oil and/or natural gas absorption expansion ratio of 5-15 times. By coating the hydrogenated styrenic thermoplastic elastomer and the inorganic filler with the hydrophilic (surface polarized) polymer, a core-shell structure is formed. When the composition is used for well cementing in an oil/gas field, the composition has a density and compatibility matching cement mortar and thus can form a uniform and stable cement slurry for well cementing in the oil/gas field, and has excellent oil/gas absorption expansion performance and thus can expand after absorbing oil/gas to perform self-healing.