119results about How to "Maintain permeability" patented technology

A method and apparatus is provided for created multiple fractures in a subterranean formation with a single, continuous treatment operation. A plurality of burst disk assemblies are included, each having an independent burst pressure and corresponding to a specific interval to be treated, whereby the assemblies are arranged on a work or completion string such that the assembly with the lowest burst pressure is positioned at the toe, or lowest position, and subsequent assemblies have increasing burst pressures toward the heel of the string. As fluid is pumped down the string, pressure builds up to exceed the burst pressure of the first disk, allowing treatment fluid to contact the formation. Once a first interval treated or fractured, it may be isolated thereby allowing pressure to again build up in the string and burst subseqent disks.

The present invention relates to a method for the treatment, amelioration and/or prophylaxis of a neurological condition, in particular neurodegenerative disorders which comprises the administration of an effective amount of a compound of formula (I): to a subject in need thereof. The present invention also relates to a compound of formula (II) and processes for its preparation.

Methods are described to make strong, tough, and/or lightweight glass-ceramic composites having a crystalline phase and an amorphous phase generated by viscous reaction sintering of a complex mixture of oxides and other materials. The present invention further relates to strong, tough, and lightweight glass-ceramic composites that can be used as proppants and for other uses.

The invention provides an additive for balancing the gastrointestinal health of animals, which is prepared by absorbing 3 to 15 percent of tributyrin, 21.5 to 52.5 percent of lactic acid and 3.5 to 7.5 percent of formic acid with special carrier white black carbon by grade and layer respectively and then combining the mixture with 1 to 10 percent of glutamine. The additive has the effects of controlling diarrhea and accelerating restoration of injured intestinal tract, and starting from a philosophy of balancing the relationship between the gastropore and the intestinal tract, saving resources, reducing environment loads and improving quality of livestock products, a comprehensive gastrointestinal health management scheme is provided.

A gas sensor includes a gas detection chamber into which a detection gas is introduced, a detecting element and a compensating element each disposed in the gas detection chamber, a detection device which detects the concentration of a detection target gas contained in the detection gas, in accordance with a difference in electrical resistance values between the detecting element and the compensating element, and a dehumidifying element which is provided in the gas detection chamber, and reversibly absorbs water contained in the detection gas and drains off the water absorbed in the dehumidifying element.

A polymer membrane for water treatment, characterized in comprising a hollow fiber membrane having a self-supporting design composed of the substantially single principal structural material, with an outer diameter of 3.6 mm to 10 mm and a ratio of outer diameter to thickness, SDR, of 3.6 to 34.

Disclosed is a sanitary napkin which is allowed to quickly absorb menstrual blood and also effective in preventing absorbed menstrual blood from returning to the skin-side surface under pressure and in concealing the color of absorbed menstrual blood from the outside. Between a liquid absorbent layer and a topsheet formed of a resin film having a large number of liquid passage apertures, there is disposed a large number of barrier members having a small width. The barrier members are strips formed of a resin film, and gaps are left between adjacent barrier members. After passing through the liquid passage apertures of the topsheet, menstrual blood tends to be absorbed by the liquid absorbent layer through the gaps. The barrier members also function to prevent liquid return and conceal the color of menstrual blood.

The invention provides a dendritic branched molecular modified separation membrane and a preparation method thereof, a composite separation membrane and application of the dendritic branched molecularmodified separation membrane and composite separation membrane, and relates to the technical field of fluid separation. The dendritic branched molecular modified separation membrane comprises separation membranes, wherein modified membranes are formed on the membrane surfaces and/or hole walls of inner holes of the separation membranes, and the modified membranes are mainly prepared from dendritic branched molecules. The provided dendritic branched molecular modified separation membrane has the advantages that the modified membranes mainly composed of the dendritic branched molecules are formed on the membrane surfaces and/or hole walls of inner holes of the separation membranes to effectively regulate the surface structures and/or inner structures of the separation membranes, be conductive to maximizing the balance between the permeability and the selectivity, and increase the permeation flux.

The invention relates to a magnesium-iron-carbon brick used for a vanadium-extracting converter and a preparation method thereof, and belongs to the technical field of refractory materials. The brick comprises, by weight, 62-84% of fused magnesite clinker, 10-18% of flaky graphite, 5-12% of iron powder, 1-3% of netted fixed carbon and 0-5% of an anti-oxidant. The preparation method comprises (1) a step of mixing the fused magnesite clinker, the flaky graphite, the iron powder and an organic binding agent, adding or not adding the anti-oxidant, and mixing uniformly to obtain a mixture; (2) a step of subjecting the mixture to compression moulding under a pressure of 200-250 MPa to prepare an unburned brick; and (3) a step of subjecting the unburned brick to heat treatment at 150-250 DEG C for 12-32 h to obtain the magnesium-iron-carbon brick. The brick provided by the invention has good practical performances and the simple preparation method, and has a good application prospect.

A method is for use with subterranean formations, such as oil and/or gas reservoirs. In some examples (e.g., production examples), the method improves the production from that formation. Some of the examples of the method describe selecting both an exertive force (e.g., a pressure) to apply at a wellbore, but together with a drawdown pressure at the wellbore to modify operations (e.g., improve production) at that subterranean formation. The selection of one or both of the exertive force and drawdown pressure may be based on the downhole environment at that wellbore, which can include the porosity and/or permeability of a near-wellbore formation radially surrounding a wellbore. The exertive force and drawdown pressure may be specifically selected to modify the porosity and/or permeability of the near-wellbore formation.