293 results about "Fracture test" patented technology

The invention relates to an online fracturing test vehicle. The online fracturing test vehicle comprises a chassis, a shelter, a back protection device, a skirt edge box, a heating system and an automatic leveling device, wherein the shelter is mounted at the upper part of the chassis; the back protection device is mounted at the back end of the chassis; the skirt edge box and a generator are mounted at the side of the chassis; the automatic leveling device is mounted at four corners of the bottom of the chassis; the heating system is mounted at the top of the chassis; the shelter is integrated with an experiment instrument for a fracturing fluid test and a support agent analysis evaluation test; and the experiment instrument for the fracturing fluid test and the support agent analysis evaluation test is mounted on the chassis provided with the shelter, so that the online test can be performed on spot, the detecting accuracy and preciseness can be improved, and the detecting efficiency is improved.

The invention relates to a method for visually monitoring a fracture crack, which comprises the steps of: with a room-temperature cured type fluid material as a fraction fluid, injecting the fluid material into a wellbore hole simulator of a core sample, filling the fluid material into the crack and fully filling into the crack when the core sample is fractured to generate the crack; and after the fluid material is cured to form a simulated crack, taking the simulated crack out and observing the form of the simulated crack. The prepared concrete core sample is subjected to a fracture test in an experiment room by selecting silicon oil and fluid silicon gel as the fracture fluid, and after the fracture fluid is filled into the fracture crack and cured, the silicon gel simulated crack is taken out, and the expansion form of the crack can be represented by observing the form of the simulated crack, therefore, the method for visually monitoring the fracture crack achieves the purpose of visualization.

The invention discloses a manufacturing method of a simulation fracture for a fractured rock mass seepage test. The manufacturing method comprises the steps of drawing a fracture digitized profile curve, constructing a fracture three-dimensional model, making a fracture plate through 3D (three-dimensional) printing, making a fracture test piece casting model and performing casting and maintenance of a fracture test piece, specifically, through digitizing a rock structural surface joint roughness profile curve, drawing the fracture three-dimensional model on the basis of CAD (Computer Aided Design) software, making the fracture plate satisfying JRC value fluctuation by adopting a 3D printing technology, making the fracture test piece casting model by combining the fracture test piece, forming by using cement mortar to cast, and making the fracture test piece by performing maintenance in a cement test piece maintenance box for 28 days. The manufacturing method has the beneficial effects: the manufacturing method of rock rough fracture analogue simulation which is easy in observing, simple in manufacturing, convenient in testing, convenient for adjusting fracture opening, and capable of truly and accurately reflect rock mass fracture structural surface roughness is provided, the working procedures are simple and clear, the manufacturing duration is short, economy and efficiency are realized, the accuracy is high, and the adaptability is good.

The invention discloses a visual intersected fracture flowing water grouting test device and method. The visual intersected fracture flowing water grouting test device comprises a grout collection device and further comprises an intersected fracture platform. The intersected fracture platform comprises supporting frames, an intersected fracture test room arranged on the supporting frames, intersected fractures arranged on the inner wall of the intersected fracture test room, flow sensors arranged inside the intersected fracture test room, and pressure sensors arranged inside the intersected fracture test room. The visual intersected fracture flowing water grouting test device further comprises a flowing water supply device used for injecting water for the intersected fracture test room and an air pressure grouting device used for grouting for the intersected fracture test room, and the intersected fracture test room is connected with the grout collection device. The visual intersected fracture flowing water grouting test device and method can achieve grouting simulation test and analysis under the conditions of the intersected fractures and flowing water.

The invention discloses a physical simulation method of coal-bed gas well hydraulic fractures. According to the method, a real three-shaft fracture simulating test frame is arranged, a fracture test piece with a wellbore hole simulator is placed in the real three-shaft fracture simulating test frame, and sound transmitting probes tightly adhere to the eight corners of the fracture test piece respectively through plastic cement and are connected with sound transmitting receivers through acoustic emission signal amplifiers; a hydraulic pressure stabilizer is connected to the exterior of the real three-shaft fracture simulating test frame; the top of the wellbore hole simulator is connected with an oil and water separator through a fracturing liquid pipeline, guar glue hydraulic fracturing liquid is added to the upper portion of the oil and water separator, and oil is added to the lower portion of the oil and water separator; a control panel is connected to the bottom of the oil and water separator. With the physical simulation method of coal-bed gas well hydraulic fractures, generation and development of fractures in the test piece can be detected in real time in the hydraulic fracturing physical simulation process in a laboratory, the three-dimensional characteristic analysis of the fractures is paid attention to, the method is not confined to observation on the extension of the fractures on the surface of the fracture test piece, and the extension process of the fractures can be better reflected.

The invention discloses a liquid CO2 phase transition multipoint fracturing and permeability increasing technology used in a coal seam, mainly solving a series of problems of poor coal seam permeability and difficult gas extraction. The method comprises the following steps: forming fracturing test drill holes in a coal seam, arranging liquid CO2 fracturing pipes in the fracturing test drill holes in a series connection mode, connecting two hole packers at the back surfaces of the liquid CO2 fracturing pipes, and pushing the liquid CO2 fracturing pipes and hole packers into the fracturing test drill holes by a push rod, wherein the liquid CO2 fracturing pipes are connected by conductive leads and connected with an exploder for a mine at the outer part of the test drill holes; and after the above arrangement, carrying out hole packing, heating the multiple liquid CO2 fracturing pipes by virtue of the exploder for a mine to convert a CO2 liquid into a high-pressure CO2 gas in short time, impacting coal to generate fracture, thus improving extraction efficiency of gas. The invention also comprises selection of an arrangement distance and time for the liquid CO2 fracturing drill holes and extraction drill holes.

The invention discloses a supercritical carbon dioxide fracture-creepage-seepage test device for high-temperature high-pressure coal petrography. The device comprises a triaxial cell, a supercriticalcarbon dioxide generator system, an axle load and confining pressure loading system, an acoustic emission monitoring system, a temperature rise control system, a deformation-pressure monitoring systemand a permeability measuring system. The device is capable of realizing the supercritical carbon dioxide fluid fracture test of coal petrography under high temperature and high pressure, monitoring and recording the temperature and pressure changes of supercritical carbon dioxide and characteristics of fracture cracking and extension in the supercritical carbon dioxide fracture process in real time, monitoring and recording the axial and radial deformations of coal petrography samples in real time, directly and effectively measuring the DH4 permeability of the coal petrography before and after the fracture without unloading the coal petrography sample stress, and measuring the CH4 permeability of the coal petrography after the fracture under the action of creepage. The measurement methodis high in precision, intuitional and high in automation degree, and the device is simple in structure.

The invention discloses a recyclable coarse fracture high velocity seepage testing apparatus which comprises a water tank, a water supply pipe, a water inlet end cap, a fracture test piece, a water outlet end cap and a return pipe which are sequentially connected and a water pressure sensor; the water supply pipe is sequentially provided with a booster pump and a pressure regulating valve, both the water inlet end cap and the water outlet end cap are provided with horizontal seams for water diversion; the fracture test piece comprises a test piece main body and a fracture main body located in the test piece main body, the fracture main body comprises a fracture, smooth flat grooves and rubber gaskets, the smooth flat grooves are distributed at two sides of the fracture along the axial direction of the fracture, the rubber gaskets are used for filling the smooth flat grooves to seal the two sides of the fracture, the two ends of axial length of the fracture are connected with the horizontal seams, and the fracture aperture is regulated through changing rubber gaskets of different thicknesses; the water pressure sensor extends into the fracture through a probe for measuring flowing water pressure of the fracture, the process of coarse rock mass fracture high velocity seepage is accurately, conveniently and truly reflected, the working procedures are simple and clear, the water volume calculation is simple, used water is recyclable, and the fracture aperture is controllable.

The invention relates to a testing method of steel fiber reinforced concrete fracture test crack initiation load, and belongs to the technical field of concrete cracking parameter testing. The testing method provided by the invention is characterized in that when a steel fiber reinforced concrete coped beam specimen cracks, a stress intensity factor of a prefabrication crack front edge achieves concrete fracture toughness, and the steel fibre blocking action is not exerted; the stress intensity factor generated by external load and concrete cracking toughness(i)K(/i) IC are equal, the external load value which is corresponding to a numerical value (i)K(/i)IC of the stress intensity factor generated by the external load can be used for determining the crack initiation load according to the curve relation graph of the external load and the stress intensity factor (i)K generated by the external load (img file='2014100081259100004dest_path_image002.TIF'wi='8'he='21'/)(/i)-(i)P(/i) curve relational graph. The testing method provided by the invenytion has the advantages that the required equipment, analyzing and processing method are simple, the cost is low, and the precision is high.

The invention relates to a smelting method of high-carbon chromium bearing steel, which is used for solving the phenomena of distribution and congregation of B non-metal inclusions in steel by controlling slag system and inclusions through controlling the Ti content in the refining process, carrying out slag exchange during refining mildly stirring and adding carbonized rice hull. The smelting method comprises the specific steps of: in EAF (electric arc furnace) process, controlling [S] in molten supernatant being less than or equal to 0.030% during burdening; in EAF tapping process, inhibiting the oxidizing slag flowing into a steel ladle and using low-Ti-content alloy; in LF (ladle furnace) process, carrying out online slag sample analysis (carrying out first LF analysis before hoistingthe ladle), and controlling the alkalinity of the low-alkalinity slag to be 2.0-3.0 with buhrstone according to the slag sample analysis before pouring the slag out of LF furnace; after VD (vacuum degassing) furnace vacuum treatment, carrying out online slag sample analysis to control hydrogen being less than or equal to 1.5ppm and no larger than 2.0ppm; after VD furnace vacuum treatment, closingthe cover and stirring mildly for 15-20 minutes; and in die casting process, using FZ-2 covering slag and adding an inlet heating agent after casting. According to the invention, by bluing fracture test measurement, the content of low-multiple inclusions is less than or equal to 2.5mm/dm<2>, the maximum length of single inclusion is less than or equal to 3mm; and the coarse system rating in B inclusions is less than or equal to 1.0.

The invention discloses a pressure-limited and discharge-quantity-unlimited fracturing method for increasing the shale gas crack transforming size. The pressure-limited and discharge-quantity-unlimited fracturing method comprises the steps that (1) reservoir evaluation before fracturing and real-time evaluation of the fracturing construction earlier stage are conducted; (2) a layered small testing fracturing test is conducted on a straight well guiding well; (3) simulation analysis is conducted through software MEYER; (4) normal fracturing construction is conducted, and in the construction midway, one-time or two-time instantaneous pump stopping is conducted; (5) the wellhead construction anticipated pressure is derived reversely through the well bottom pressure; (6) as long as the wellhead construction pressure is lower than the anticipated pressure of the step (5), the discharge quantity is increased to enable the wellhead pressure to approximate the anticipated value; and (7) if the wellhead construction pressure after the discharge quantity is increased still does not reach the anticipated pressure, the construction sand-liquid ratio is increased. According to the pressure-limited and discharge-quantity-unlimited fracturing method for increasing the shale gas crack transforming size, the various problems caused by using a discharge-quantity-limited method can be solved, so that the actual after-fracturing transforming size of a shale reservoir is increased, and the complexity of man-made cracks is improved.

The invention discloses a soil body two-dimensional fracture testing method and device. In the testing method, loading clamps are combined in different forms according to different fracture testing types; the loading clamps are installed on a power loading device according to required loading angles. Loading rods are connected with the external power loading device, and starting and loading modes of the loading rods are controlled by a computer and a data acquisition system. The testing device comprises a sample, a loading plate I and a loading plate II, wherein a loading clamp is formed by the loading plate I and the loading plate II which are completely identical. Each loading plate comprises a clamp body, a loading rod installing hole, a compression-shear assisting plate, a sample fixing hole, a sample clamping plate, a pull-shear assisting plate and the corresponding loading rod, and the compression-shear assisting plates and the pull-shear assisting plates are detachable. The testing device can simultaneously achieve compression-shear type '-I-II type', shear type 'II type', pull-shear type 'I-II type' and stretching type 'I type' fracture testing.

A mechanical test method prescribes compressing brittle balls in spherical conforming opposing platens producing equatorial bulging, tensile stresses, and resulting indentation crack growth that is imaged for providing direct measurement of the fracture toughness of brittle balls, such as, silicon-nitride balls used in hybrid bearings as well as conventional steel ball bearings, with measurement errors being immune to characterizing the dimensions and positioning of the precrack indentations, so that, the test method is accurate, repeatable, and robust.

The invention provides a hydraulic fracturing test apparatus based on a conventional testing machine for rock mechanics. The hydraulic fracturing test apparatus comprises a lower pressing head and an upper pressing head. The lower pressing head is arranged on a triaxial base plate, and an axial compression bar acts on the upper pressing head. Both the upper pressing head and the lower pressing head are designed with pressure water channels. The hydraulic fracturing test apparatus is characterized by further comprising a leak-proof sleeve and a permeable plate; the leak-proof sleeve sleeves the rock specimen to prevent pressure water from mixing with confining oil in a triaxial chamber, and the upper end and the lower end of the leak-proof sleeve are respectively fixed to the upper pressing head and the lower pressing head; the permeable plate is distributed with pressure water permeable holes and is arranged between the rock specimen at the pressure water outlet end and the upper pressing head; one of the upper pressing head and the lower pressing head is a pressing head combination combined by an acting pressing head acting on the rock specimen and an adapting pressing head, and the acting pressing head is connected with the adapting pressing head through a tongue-and-groove insertion structure. The invention further provides the rock specimen for the apparatus and the hydraulic fracturing testing method utilizing the hydraulic fracturing test apparatus based on the conventional testing machine for rock mechanics to achieve hydraulic fracturing tests on the conventional test machine for rock mechanics.

The invention discloses a cracking load determination method of a concrete fracture test based on an acoustic emission technique. A three-point bending concrete beam is measured, an acoustic emission sensor and a load sensor are adopted, the acoustic emission sensor is connected with an acoustic emission collection device, and the load sensor is connected with a load-strain collection device. The cracking load determination method comprises the following steps of pasting the acoustic emission sensor on the surface of the three-point bending concrete beam, and putting the load sensor in a position, to which load is applied, of the three-point bending concrete beam, wherein the acoustic emission sensor is perpendicular to the surface of the three-point bending concrete beam; applying load to the three-point bending concrete beam, and recording the load as cracking load of the three-point bending concrete beam when the interior of the three-point bending concrete beam begins to crack. According to the cracking load determination method of the concrete fracture test based on the acoustic emission technique, the cracking load of the concrete fracture test can be more precisely determined.

The invention discloses a laboratory staged hydraulic fracturing test method for large-size natural rock. The method comprises the following steps: 1) selecting natural rock, processing the rock into a standard-size test piece, drilling a hole of desired depth in an end face of the test piece, and cutting multiple ring grooves in the drill-hole, wherein a cavity between the ring grooves is a glue injection cavity; 2) placing a liquid injection pipe at a predetermined ring groove, filling the ring groove with coarse sand, filling the glue injection cavity with glue, sealing two ends of glue with foraminous separator plates until the glue is solidified; 3) repeating the Step 2; 4) placing the standard test piece onto a test rack, connecting the liquid injection pipe, applying three-dimensional confining pressure, and carrying out a staged fracturing test; and 5) unloading three-dimensional confining pressure off the standard test piece, dismounting the liquid injection pipe, and sectioning the standard test piece to observe the internal fracture morphology so as to end the test. The method provided by the invention can be adopted to carry out a staged fracturing test on natural rock under laboratory conditions so as to obtain fracture morphology under experimental conditions.

The invention discloses a cohesive soil strain control type I fracture toughness tester and a test method. The tester includes a mounting table, a motor is installed on the mounting table, and the motor is connected with a telescopic connecting rod. A sensor is connected to the front end of the connecting rod, and the sensor is connected to the push rod; a base is provided on the mounting table, a slide rail is provided on the base, a sample to be tested is provided on the slide rail, and a pair of stoppers are fixedly connected to the base. Rod, one side of the tested sample is connected with the blocking rod, and the other side is connected with the push rod, and the tested sample is provided with an initial crack. A strain-controlled Type I fracture toughness tester for cohesive soil of the present invention eliminates the influence of gravity by laying the test sample flat to perform the fracture test, and eliminates the influence of gravity by placing the test sample on the slide rail. The effect of friction.

The invention relates to a device and a method for measuring the I-type creep fracture toughness and the fracture toughness of rock. A rock single axle tensile creep fracture test and a conventional fracture test are carried out on the device for measuring the I-type creep fracture toughness and the fracture toughness of rock, thus the I-type creep fracture toughness and the fracture toughness of rock are measured. The measuring method comprises the steps of: transferring a pressure applied by the exterior into a tensile force of the interior of a rock test piece so as to realize the single axle tension of the rock test piece. The invention enables the operation of the indoor measuring method of rock fracture toughness to be simpler, guarantees the accuracy of the measured data of the test and has rather high precision, therefore having excellent using and popularizing values.