63 results about "Increased fractures" patented technology

Well treating composites are composed of an organic lightweight material and a weight modifying agent. The organic lightweight material preferably forms the continuous phase and the weight modifying agent forms the discontinuous phase. The apparent specific gravity (ASG) of the organic lightweight material is less than the ASG of the well treating composite. The composite of the invention is particularly useful in hydraulic fracturing fluids as lightweight proppants as well as in sand control methods, such as gravel packing and frac packing A subterranean formation may be treated by injecting the well treating composite into the formation in order to increase fracture conductivity, reduce the generation of fines, reduced unwanted water production and/or reduce particulate production.

Methods for increasing the fracture resistance of a polymer stent's drug-polymer coating and scaffolding including applying a coating and crimping using techniques that increase the resistance to fracture in the coating layer and scaffolding and scaffolding.

A silicon penetration device with increased fracture toughness and method of fabrication thereof are provided. The method comprises strengthening silicon penetration devices by thermally growing a silicon oxide layer on the penetration device and then subsequently stripping the silicon oxide. The method also includes strengthening silicon penetration devices through the sputtering of thin film coatings on the silicon penetration devices.

A method of increasing the fracture resistance of a low permeability formation that includes emplacing a wellbore fluid in a wellbore through the low permeability formation, the wellbore fluid comprising: a settable carrier fluid; and a solid particulate bridging material; increasing the pressure in the wellbore such that fractures are formed in the formation; allowing the settable carrier fluid to enter the fractures; bridging and sealing the mouths of the fractures to form a substantially impermeable bridge proximate the mouth of the fractures thereby strengthening the formation; and holding the increased pressure for an amount of time sufficient for setting of the carrier fluid in the fractures is disclosed.

The invention provides a method for increasing the fracture stimulated reservoir volume of shale gas. The method includes the following steps that firstly, the brittleness index of shale is fine analyzed and evaluated; secondly, a proper number of shower holes are selected; thirdly, induced fracturing testing is conducted on each segment; fourthly, acid pretreatment is conducted; fifthly, the amplitude of shale original horizontal stress difference relative to major fracture net pressure is judged, and a fracture is further treated; sixthly, balls are thrown according to the cluster number of perforated holes and the total number of the perforated holes. By fine analyzing and evaluating the brittleness index of shale, selecting reasonable perforated hole parameters, conducting induced fracturing testing on each segment of a horizontal well, well controlling the major fracture net pressure and well controlling a diverting agent in the fracture, generation of network fractures or volume fractures is improved in the shale gas well fracturing process, accordingly the fracture stimulated reservoir volume is increased, and finally the fracture flow conductivity is improved after shale gas fracturing.

A method of propagating a fracture farther from a well-bore into an oil and/or gas-bearing zone of a target formation while inhibiting growth of the fracture into an adjacent water-bearing zone under or over the oil and/or gas-bearing zone, comprises creating a zone of increased in-situ stress a vertical distance adjacent a target interval and then creating a main fracture in the target interval by, for example, fracturing the target interval with enough fracture fluid and pressure to propagate the main fracture, inter alia, vertically to the zone of increased in-situ stress. When vertical growth of the main fracture reaches the limit set by the zone of increased stress, additional fracture fluid pumped into the target interval tends not to propagate the main fracture vertically beyond that limit and, instead, tends to propagate the main fracture more laterally and farther from the well. Such zone(s) of increased in-situ stress can be created above, below, or both above and below the target interval.

Methods of fabricating a polymeric implantable device from a PLLA/PDLA blend such as a stent with improved fracture toughness are disclosed. The blend is melt processed to allow formation of stereocomplex crystallites, which are nucleation sites for crystal growth. A polymer construct is formed from the melt processed blend and device is formed from the polymer construct. The stereocomplex crystallites result in an in increase in nucleation density and reduced crystal size, which increases fracture toughness of the formed device.

The invention discloses a method for slight fracture supporting, capable of increasing a fracture stabilization period. The method comprises the steps of (1) evaluation of a microstructure of reservoir rocks, (2) a first-stage injection phase, and (3) second-stage and third-stage injection phases. During the second step, (1) an ultralow-viscosity fracture solution carrying a micro-particle-diameter supporting agent is injected to communicate and extend natural fracture systems with micro scales, a low-viscosity fracture solution carrying a small-particle-diameter supporting agent is injected to communicate and extend natural fracture systems with large scales; a middle-viscosity fracture solution carrying a middle-particle-diameter supporting agent is injected to extend fracture systems with large scales; and (4) a high-viscosity fracture solution carrying a large-particle-diameter supporting agent is injected to extend fracture systems with the maximum scale. According to the invention, through fine evaluation of the microstructure of the reservoir rocks, alternate multi-stage injection, utilization of viscous fingering effects of various liquids with different viscosities, multi-scale sand adding and other methods, the fracture systems with the different scales within a full seam length scope of a main fracture can be fully expanded, extended and supported; and a "valid reshaping volume" of fractures and "supporting efficiency" of cracks are increased.

The invention relates to the field of shale reservoir stimulation, in particular to a method of increasing fracture network density for shale gas well fracturing improvement.The method includes selecting an oxidizing agent according to target sub-area shale reservoir organic matters and mineral characteristics; adding the oxidizing agent into fracturing fluid prepad fluid and filling the inside of a reservoir with the fracturing fluid prepad fluid along with fracturing fluid.The method has the advantages that the characteristics that the oxidizing agent can oxidize the organic matters, iron pyrite and the like in shale to react to generate heat and gas to form high temperature and high pressure and organic acids in reaction products can corrode carbonate minerals are used, and the effects of fracturing operation energy and the fracturing fluid are fully used, so that a main body fracture network is formed, in other words, the volume is improved; retained fracturing fluid and the mechanics-chemical action of the shale are used to cut shale base blocks in the improved volume or 'crush' the shale base blocks in the improved volume by soaking, in other words, efficiency or density is improved, and gas transportation rate in the improved volume is further increased.

The invention discloses a preparing method of PC/SAN alloy, which is characterized by the following: making segmented copolymer of hydrogenated butadiene rubber without double bond and phenylethene or segmented copolymer of hydrogenated polyisoprene and phenylethene directly with polycarbonate, phenylethene-acrylon copolymer and anti-oxidant in the double-screw squeezer to prepare the product; simplifying the manufacturing technology with good mechanic and manufacturing property; improving alloy phase rate of PC/ABS; increasing fracture growing rate by 300%.

The invention provides a gaseous phase fracturing device. The device can be used for regulating pressure and blasting speed, and comprises a buffer, a snifting valve, a supercharging device, an inflation valve, a fracturing pipe, a sealing ring and a shear plate, wherein the inflation valve and the snifting valve are connected to two end parts of the fracturing pipe through seal threads; the inflation valve comprises a valve and an electrode, the valve is opened and closed to realize the filling of the gaseous phase fracturing device, the electrode is connected with a main hole, and high pressure sealing is realized through the threads and a sealing gasket; meanwhile, a high-performance insulating material and the inflation valve are insulated from each other. The gaseous phase fracturing device is used for fracturing a pre-mining coal bed, increasing fractures of the coal bed and driving gas adsorbed by the coal bed, so that the gas is convenient to extract and the coal and gas outburst risk is eliminated. During use, open fire is avoided, and open fire explosion generated by the traditional detonator and dynamite blast is avoided. The device has the characteristics of safety, high efficiency, simple management and the like.

The present invention relates to a polymer thickener for a high-temperature-resistant water-based fracturing fluid and a production method for the polymer thickener. The thickener for the water-based fracturing fluid is a low molecular polymer which is good in temperature resistance, shear resistance and sand carrying performance in a hyperbranched structure and is used for a production-increasing fracturing operation in an oil field. The thickener is copolymerized by six monomers: acrylamide (AM), acrylic acid (AA), dimethyl diallyl ammonium chloride (DMDAAC), N,N'-methylenebisacrylamide (MBA), sodium p-styrenesulfonate (PSNN) and allyl polyoxyethylene ether (APEG). A production method for the thickener uses a thermal decomposition-type and redox-type initiator, so that the monomers are polymerized. The thickener provided by the present invention has the advantages of small amount of residues, low usage viscosity, good proppant carrying capacity, low cost and easy flow back and the like.

In one embodiment, composite constructions of the invention are in the form of a plurality of coated fibers bundled together to produce a fibrous composite construction in the form of a rod. Each fiber has a core formed from a hard phase material, that is surrounded by a shell formed from a binder phase material. In another embodiment of the invention, monolithic sheets of the hard phase material and the binder phase material are stacked and arranged to produce a swirled composite in the form of a rod. In still another embodiment of the invention, sheets formed from coated fibers are arranged to produce a swirled composite. Inserts for use in such drilling applications as roller cone rock bits and percussion hammer bits, and shear cutters for use in such drilling applications as drag bits, that are manufactured using conventional methods from these composite constructions exhibit increased fracture toughness due to the continuous binder phase around the hard phase of the composites. These binder phases increase the overall fracture toughness of the composite by blunting or deflecting the tip of a propagating crack.

The invention discloses a method for increasing the fracturing volume in a tight sandstone reservoir. The method includes the steps that (1) micro-fractures are formed in the tight sandstone reservoir; step (2) the micro-fractures are expanded and communicated; step (3) hydraulic fracturing is performed to form main fractures; and step (4) a proppant is turned from temporary blocking to form branch fractures. The method is suitable for fracturing transformation production increase operation of the tight sandstone reservoir with micro-fractures not developed. Through innovative process ideas, first, a large number of radial micro-fractures are artificially generated in a sandstone reservoir with the micro-fractures not developed and a dense matrix, then the main fractures penetrating through the micro-fractures are formed through hydraulic fracturing, and in the extension process, the main fractures are turned for multiple times, so that a complex fracture system is formed, and the fracturing transformation volume is increased and the production increase effect is improved.

The invention aims at providing a rubber composition used on a face of a heavy load tyre with increased fracture physical properties and improved chipping resistance during the whole moving period from an initial stage to a long term period. The invention solves the problem by providing the rubber composition, namely the rubber composition used on the face of the heavy load tyre, and is characterized in that the invention comprises substances which are: (by weight) 100 portions of rubber that can be vulcanized and natural rubber and/or compound polyisoprene rubber is taken as the main part, 30-80 portions of carbon black and/or silicon dioxide with nitrogen adsorption specific surface area of over 70m2/g and less than 1.0 proportion of organic acid cobalt salt that is counted basing on cobalt element.

A method for drilling a wellbore in a formation using a drilling fluid, wherein the drilling fluid has a first temperature, and wherein the wellbore has a first wellbore depth. In one embodiment, the method comprises determining at least one fracture gradient, wherein the fracture gradient is determined at about the first wellbore depth; increasing the temperature of the drilling fluid from the first temperature to a desired temperature at about the first wellbore depth; drilling into the formation at increasing wellbore depths below the first wellbore depth, wherein at least one equivalent circulating density of the drilling fluid is determined at about the first wellbore depth; and setting a casing string at a depth at which the equivalent circulating density is about equal to or within a desired range of the fracture gradient. In other embodiments, an automated system is used to maintain the temperature of the drilling fluid at about first wellbore depth.

A high-temperature resistant seawater-based polymer fracturing fluid capable of continuous blending and a preparing method thereof are disclosed. The fracturing fluid includes 0.4-0.8 wt% of a thickening agent, 0.3-0.6 wt% of an auxiliary synergist, 0.2-0.4 wt% of an activating agent, 0.2-0.4 wt% of a metal ion stabilizer, and 0.3-0.4 wt% of a temperature stabilizer, with the balance being seawater. Beneficial effects of the fracturing fluid are that: a water-soluble multi-component copolymer is adopted as the thickening agent of the fracturing fluid system so that the fracturing fluid can rapidly swell in seawater having a high degree of mineralization; a low-viscosity high-elasticity fluid having a high space structure is formed through synergistic effects (non-crosslinking functions) with the auxiliary synergist; a sand-carrying property is good when the apparent viscosity is greater than 20 mPa.s; the prepared fracturing fluid is not eroded by bacteria, has characteristics of salt resistance, good temperature resistance and shearing resistance, low harm, no residue after cleaning, and the like, and can be prepared in batch or mixed continuously by adopting sea water; and the fracturing fluid can significantly reduce offshore fracturing construction costs and can increase fracturing construction efficiencies and reservoir yield-increasing effects.

The invention discloses a preparation method of Nb3Sn superconducting magnet with increased fracture resistance performance. The method comprises the following steps: firstly fully soaking Nb3Sn superconducting coil in epoxy resin under vacuum atmosphere, then using nitrogen for pressurization to ensure that epoxy resin is fully soaked in the Nb3Sn superconducting coil and finally solidifying to obtain Nb3Sn superconducting coil. When using the Nb3Sn superconducting coils prepared by the method of the invention for excitation, as the Nb3Sn superconducting coils are completely insulated, the Nb3Sn superconducting coils can not fracture.

A composition and method required for providing a fracturing fluid pumped down a well bore and into a subterranean formation under conditions of pressure that will fracture the subterranean formation is described. More specifically, the composition increases the recovery of hydrocarbons from a geological formation penetrated by a well bore, wherein the composition includes a fracturing fluid that is liquid carbon dioxide (LCO₂) with proppant to aid transport of the proppant in suspension, and thereby create a fracture using a fracturing fluid which is the thickened composition containing fumed silica. When the composition is without a proppant, the viscosity of the composition is increased in order to improve the fracturing operation through aspects such as increased fracture width and reduced fluid leak-off

A method is provided that increases fracture toughness and reduces brittleness of a semi-crystalline ferroelectric polymer material while substantially maintaining ferroelectric properties of the material. The material is heated in an inert oxygen-free atmosphere to a temperature above the material's Curie transition but below its melting temperature. The material is then irradiated with beta particles to provide a desired level of fracture toughness that substantially maintains ferroelectric properties of the material. In the case of poly(vinylidene fluoride-trifluorethylene), the heating temperature is just above the material's Curie transition temperature, the beta particles have an energy level of approximately 2.5 mega electron volts (MeV), and the radiation dose should not exceed approximately 50 megarads (Mrads).

The invention belongs to a multi-stage aging treatment method for aluminium-zinc-magnesium-copper 7000 series alloy thick plates. The multi-stage aging treatment method is characterized by comprising the following steps of (a) putting the aluminium-zinc-magnesium-copper 7000 series alloy plates in a box type quenching furnace (1) to carry out quenching treatment, wherein a quenching temperature is increased to 477+/-3 DEG C and a retention time is 80-100 min; (b) cooling the quenched in a water cooler (2); (c) carrying out multi-stage aging treatment in an aging furnace (3), wherein a first stage aging temperature is 120+/-3 DEG C, a second stage aging temperature is 155+/-3 DEG C and a third stage aging temperature is 120+/-3 DEG C; and (d) processing into samples, stretching the samples on an electronic universal testing machine (4), observing microstructures and detecting changes of crystal grains under an optical microscope (5), and determining conductivity on an conductivity meter (6). The aluminium-zinc-magnesium-copper 7000 series alloy thick plates treated by the method increase mechanical properties of aluminium alloy materials and obviously increase fracture toughness.