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1717 results about "Petrology" patented technology

Petrology (from the Ancient Greek: πέτρος, romanized: pétros, lit. 'rock' and λόγος, lógos) is the branch of geology that studies rocks and the conditions under which they form. Petrology has three subdivisions: igneous, metamorphic, and sedimentary petrology. Igneous and metamorphic petrology are commonly taught together because they both contain heavy use of chemistry, chemical methods, and phase diagrams. Sedimentary petrology is, on the other hand, commonly taught together with stratigraphy because it deals with the processes that form sedimentary rock.

Method for calculating oil saturation of reservoir

ActiveCN102434152ASolve the difficulty of low accuracy in quantitative evaluation of saturationIn line with the actual lawBorehole/well accessoriesElectrical resistance and conductanceNMR - Nuclear magnetic resonance
The invention discloses a method for calculating oil saturation of a reservoir. The method comprises the following steps of: establishing a reservoir oil saturation model including a free fluid porosity phi f, a bound fluid porosity phi b, as well as corresponding macropore bond index mf, micropore bond index mb and micropore bond index characteristic value parameters; measuring a core porosity phi of a selected core sample; carrying out a nuclear magnetic resonance T2 spectrum experiment and an electric petrophysical experiment on the selected core sample to determine the core porosity phi and bound water saturation Swir of the selected core sample, the free fluid porosity phi f and bound fluid porosity phi b, stratum water resistivity Rw of a saturated rock sample, saturated water rock resistivity Ro of each rock sample, and resistivity Rt of each rock under different conditions of water saturation Sw; determining parameters of a reservoir oil saturation model by adopting an optimization data fitting method; establishing a relationship between the core micropore bond index mb and the bound water saturation Swir; classifying reservoir cores according to the bound water saturation; and determining a saturation index n of each type of cores by using the optimization fitting algorithm.
Owner:PETROCHINA CO LTD

Determining method for surveying reserves of hypotonic clastic rock oil-gas reservoir

The invention relates to a determining method for surveying the reserves of hypotonic clastic rock oil-gas reservoir positioned on a clastic rock oil (gas) geological reservoir enrichment boundary, comprising the following steps of: carrying out statistical regression on the daily produced oil-gas data and water data of the traditional testing oil well and the traditional testing gas well and thecorresponding physical data, oil-bearing data and electrical data of an oil layer to determine the physical lower limit value, the oil-bearing lower limit value and the electrical lower limit value of an oil-gas layer, which correspond to industrial oil-gas flows; determining the minimum values of output and a sand body thickness according to the relationship between an effective thickness and test oil output and between the sand body thickness and test production; determining the area boundary of the oil-gas reservoir by using a sandrock thickness isoline method and an effective thickness isoline method; and calculating the reserves of the hypotonic clastic rock oil-gas reservoir. The invention solves the problem that the oil-bearing area of the traditional hypotonic clastic rock oil (gas) reservoir is extrapolated depending on artificial well points, is convenient to apply in the calculation of the reserves, can not only be used for more accurately calculating the reserves of oil (gas) reservoir, but also furthest save the exploration discovery workload and reduce the discovery cost of ton reserves, thereby enhancing the economic benefits of oil-gas exploration and development.
Owner:PETROCHINA CO LTD

Method for self-circulation exploitation of geothermal energy of hot dry rock with multilateral well and volume fracturing technologies

InactiveCN105840146AAvoid the problem of not being able to connect efficientlyIncrease temperatureOther heat production devicesGeothermal energy generationInjection pressureDual action
The invention relates to the field of geothermal exploitation and provides a method for self-circulation exploitation of geothermal energy of hot dry rock with multilateral well and volume fracturing technologies. According to the method, firstly, multilateral well holes are drilled in different depths of a reservoir of the hot dry rock, the reservoir between upper and lower multilateral well holes is fractured with the volume fracturing technology, a high-permeability hot dry rock reservoir is constructed, and finally, thermal-carrying media are injected and exploited for geothermal exploitation. Annularly-injected low-temperature thermal-carrying media flow to the fractured reservoir of the hot dry rock along the multilateral well holes in the upper part of the reservoir, flow to the multilateral well holes in the lower part under the double actions of injection pressure and potential-energy difference and finally flow back to the ground along an oil pipe. According to the method, the multilateral well and fracturing technologies are sufficiently utilized, the reservoirs of the hot dry rock are effectively communicated, the problem about crack communication during conventional double-well fracturing for injection and exploitation is solved, the potential-energy difference in different depths can be further effectively utilized, and the flowing capability of the thermal-carrying media is greatly improved. With the use of the thermal insulation oil pipe, the thermal loss in the exploitation process of the thermal-carrying media is further reduced, and the exploitation efficiency of geothermal energy is improved.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)

Drilling and sealing method and sealing device for ultra-high pressure fracturing holes in underground coal mines

The invention discloses a drilling-sealing method and a sealing device of a coal mine underground ultrahigh pressure fracturing hole. The drilling-sealing method comprises the following steps: drilling a plugging hole on coal rock body; going on drilling a fracturing hole forward in the plugging hole; transmitting the sealing device into the plugging hole, enabling a water outlet hole of a fracturing pipe to stretch into the fracturing hole and enabling a taper sleeve sleeved on the fracturing pipe and made of soft material to plug on a hole opening of the fracturing hole; sealing by using polyurethane and solidifying for 30 minutes for 1 m length section at the hole opening of the plugging hole; and grouting cement slurry greater than 425 into the plugging hole with pressure by a grouting pipe, and solidifying for 48 hours after finishing grouting. The device comprises a grouting pipe and a slurry returning pipe and a fracturing pipe. The grouting pipe and the slurry returning pipe are arranged in the plugging hole. The grouting pipe, the slurry returning pipe and the fracturing pipe are connected integrally. A soft taper sleeve is arranged on the fracturing pipe. The soft taper sleeve is plugged at the hole opening of the fracturing hole. The invention has the advantages that the sealing method has high sealing success rate, good effect and wide application range; and the sealing device has simple structure and convenient operation.
Owner:重庆市能源投资集团科技有限责任公司 +1

Identification method of deposition and diagenetic integrated phase of clastic rocks

The invention discloses an identification method of the deposition and diagenetic integrated phase of clastic rocks. The method comprises the steps of 1) defining the deposition and diagenetic integrated phase based on a rock core; and 2) identifying the deposition and diagenetic integrated phase by utilizing a logging curve. The invention brings forward the concept of the deposition and diagenetic integrated phase for the first time, and influence of original decomposition and post-stage diagenesis on reservoir physical properties and logging response are taken into consideration; the classification standard of the diagenetic phase in the deposition and diagenetic integrated phase is re-defined, the principle of classifying the diagenetic phase according to the absolute values of compacting, cementing and corroding effects to the reservoir physical properties is provided for the first time, and thus, classification of the diagenetic phase is more accurate; and the logging identification method, in which crossplot identification is carried out on the basis of Bayesian discrimination, of the deposition and diagenetic integrated phase is provided for the first time, and the correct rate of logging identification is obviously improved.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)

System and method for testing rock damage and permeability under coupling effect of temperature stress and circumferential seepage

The invention discloses a system for testing rock damage and permeability under the coupling effect of temperature stress and circumferential seepage. The system comprises a frozen-heave force test device and a permeation test device, wherein the permeation test device comprises a pressure chamber for loading a rock test piece to be tested, a pressure loading device, a permeation pressure increasing and measuring device, a water bath heating device, an ultrasonic damage test device and a data acquisition device. The invention further discloses a method for testing rock damage and permeability under the coupling effect of temperature stress and circumferential seepage. The method comprises the following steps: carrying out repeated freezing-thawing tests on a rock by the frozen-heave force test device, measuring the frozen-heave force change of the rock test piece, putting the rock into the pressure chamber, applying a pressure to the rock test piece by the pressure loading device, and testing a rock permeation coefficient k and ultrasonic wave speed transmission time t under the action of flowing liquid with different temperatures and pressures so as to make a research on rock damage and permeability.
Owner:DALIAN MARITIME UNIVERSITY

Device and method for measuring gasometry permeability of rock under high pressure

ActiveCN102455277AAccurate acquisition of measured permeabilityPermeability/surface area analysisPenetration ratePetrology
The invention provides a device and a method for measuring the gasometry permeability of rock under high pressure and belongs to the field of exploration and development of oil fields. The method comprises the following steps of: firstly, sampling gas reservoir rock and testing the rock sample by using test gas to acquire the permeating quantity of the rock sample to the test gas under the high pressure and pressure of the test gas at the moment; secondly, measuring the viscosity of the test gas under different pressure at experimental temperature to acquire a relational expression between the viscosity and the pressure of the test gas; and finally, processing the data to acquire the gasometry permeability of the rock under the high pressure. A process and the method for measuring the gasometry permeability of the rock under high pressure are established; furthermore, by analysis of the property of the gas under the high pressure, a method for processing the data of the gasometry permeability of the rock under the appropriate high pressure can be implemented; under the condition like that of high-pressure gas reservoir stratum, the gasometry permeability of the rock under the high pressure can be obtained more accurately; and data support is supplied to the development of high-pressure gas reservoir.
Owner:CHINA PETROLEUM & CHEM CORP +1

High-flow-conductivity acid fracturing method for carbonate rock reservoirs

The invention discloses a high-flow-conductivity acid fracturing method for carbonate rock reservoirs, and belongs to the field of reservoir reconstruction technologies. The high-flow-conductivity acid fracturing method includes applying acid fracturing processes for corroding crack by acid fluid and hydraulic fracturing processes for filling the crack with added sand in a combined manner, to be more specific, forming the crack in the carbonate rock reservoirs by the aid of non-reactive ahead fluid and reducing the surrounding temperatures of wall surfaces of the crack; injecting high-concentration acid fluid systems to corrode the wall surfaces of the artificial crack and forming uneven grooves in the wall surfaces of the crack by means of corroding to allow the crack to have certain flow-conductivity after the crack is closed; enabling high-viscosity sand-carrying fluid to carry proppants and flow into crack systems and filling the crack with the high-viscosity sand-carrying fluid to further improve the flow-conductivity of the crack. The high-flow-conductivity acid fracturing method has the advantages that the high-flow-conductivity acid fracturing method is reasonable in design, simple in process and convenient to implement in fields, the high-flow-conductivity crack systems with the acid-corroded crack and crack closing supporting functions can be formed, oil and gas flow resistance can be reduced, the acid fracturing reconstruction effects can be improved for the carbonate rock reservoirs, and the high-flow-conductivity acid fracturing method can be widely used for acid fracturing reconstruction construction for limestone, dolomite and carbonate rock oil and gas reservoirs with mud.
Owner:CHINA PETROLEUM & CHEM CORP +1

Reservoir stratum identification method

ActiveCN102373923AEasy to realize engineering applicationConstructionsBorehole/well accessoriesPorosityChannel data
The invention relates to a reservoir stratum identification method, which comprises the following steps of: separating out a contact well wall zone, a near well wall zone, a far well wall zone and an ultra far well wall zone according to the detection depth properties of different logging instruments; extracting the stratum seam hole development information of the contact well wall zone by using a micro computed tomography (CT) porosity analysis or electric imaging spectrum resolving technology; acquiring the stratum seam hole development condition of the near well wall zone based on dipolar sound wave logging data; acquiring the stratum seam hole development condition of the far well wall zone based on small-angle nearly perpendicular azimuth reflecting sound wave logging data; discovering a seam hole development belt in the stratum of the ultra far well wall zone based on well side seismic channel data; and judging whether the reservoir stratum has industrial capacity based on seam hole information extraction of the four detection depth zones. By establishing the effective reservoir stratum identification method with depth detection gradient and azimuth directing capacity, the identification coincidence rate of the effective reservoir stratum is improved, and a powerful technical support is provided for implementing the strategic goals of 'high yield in rare wells and high efficiency in sparse wells' in Chinese major oilfields.
Owner:PETROCHINA CO LTD

Pressure rock failure and instability process and dynamic permeability test apparatus and method thereof

The invention relates to a pressure rock failure and instability process and dynamic permeability test apparatus and a method thereof. A stress strain signal, a sound emission signal and an apparent resistivity signal in the pressure rock failure and instability process are acquired and processed by using a large pressure rock permeability test device to obtain the stress strain relationship, the quantity and positions of sound emission events and the rock apparent resistivity change rule induced by pressure water permeability increase in large pressure rock failure and instability process in order to obtain the dynamic evolution role of crack expansion, perforation and instability in the rock failure process under hydraulic-mechanical coupling action and the corresponding dynamic permeability. The hydraulic-mechanical coupling failure mechanism and the pressure permeability of rocks, and the deformation and strength characteristics, the crack expansion, perforation and failure characteristics and the permeability evolution rule of pressure water in the crack expansion-perforation-failure process of the rocks under the hydraulic-mechanical coupling action are researched in the invention. The apparatus and the method have important engineering values in realization of safe mining under water pressure on pressure water.
Owner:ANHUI UNIV OF SCI & TECH

Method for evaluating fracturing property of shale based on rock debris microscopic characteristics

The invention discloses a method for evaluating fracturing property of shale based on rock debris microscopic characteristics. The method comprises the following steps: (1) taking the rock debris at specific depth in reservoir of an oil gas well; (2) acquiring the relative amount of total-rock minerals through X-ray diffraction test for the rock debris, and calculating a brittleness index I1 of the minerals; (3) testing the nanoindentation microcosmic mechanical parameters of the rock debris and calculating a microcosmic mechanical brittleness index I2 thereof; (4) calculating the surface crack fractal parameter of the rock debris through scanning electron microscope, thereby acquiring a fractal brittleness index I3; (5) performing 3D laser scanning on the rock debris and calculating the surface rough brittleness index I4; (6) weighting the above four brittleness indexes according to the practical condition of the oil field, thereby acquiring a comprehensive fracturing index I; (7) repeating the steps (1)-(6), calculating the fracturing indexes of the rock debris at different depths and drawing a whole-well comprehensive fracturing index longitudinal layout. According to the method provided by the invention, the comprehensive fracturing index of the shale rock debris can be acquired and the necessary basis is supplied for fracture selecting layer with core-taking difficulty or without core shale reservoir.
Owner:SOUTHWEST PETROLEUM UNIV

Glass medium model imitating rock core structure

The invention belongs to the technical field of foam performance study chip analysis, and mainly relates to a glass medium model that imitates a rock core structure and can be used for foam flooding and percolation mechanism study in tertiary oil recovery. The glass medium model includes a first liquid inlet pool, a second liquid inlet pool, a glass substrate, coverglass, a drainage hole, a drainage pool, a drainage pool channel, a micro channel imitating the rock core structure, a first liquid inlet hole, a second liquid inlet hole, a microbubble generation module and a microbubble splitting module. Specifically, the micro channel imitating the rock core structure is etched on the glass substrate; the first liquid inlet hole, the second liquid inlet hole, and the drainage hole are respectively disposed at two ends of the coverglass; the two liquid inlet holes are communicated with the microbubble generation module respectively through the two liquid inlet pools; the microbubble generation module is communicated with the microbubble splitting module; the microbubble splitting module is communicated with the micro channel imitating the rock core structure; and two ends of the drainage pool channel are respectively communicated with the tail of the micro channel imitating the rock core structure and the drainage pool, and the drainage pool is communicated with the drainage hole.
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI

Detection method and device for effective fractured intervals in unconventional shale oil and gas reservoir

The invention discloses a detection method and a device for effective fractured intervals in an unconventional shale oil and gas reservoir. The method includes: collecting logging information and core sample information of intervals of interest; calculating volume contents of all minerals in rock generating the intervals of interest according to the collecting logging information and the core sample information; calculating the poisson ratio of all mineral constituents in the rock generating the intervals of interest according to the core sample information and rock space volume average elastic parameter models; calculating the fragility index of the rock generating the intervals of interest according to the volume contents of all the minerals and the poisson ratio of all the mineral constituents in the rock generating the intervals of interest; and selecting the intervals of interest with the high rock fragility index in the shale as the effective fractured intervals in the unconventional shale oil and gas reservoir. By means of the detection method and the device for the effective fractured intervals in the unconventional shale oil and gas reservoir, the actual production requirement for selecting the effective fractured intervals in exploration and development of the unconventional shale oil and gas reservoir can be met.
Owner:PETROCHINA CO LTD

Device for simulating crack initiation and evaluating fissured flow under true triaxial stress

The invention discloses a device for simulating crack initiation and evaluating fissured flow under true triaxial stress and belongs to the field of fracture acidizing. The device disclosed by the invention comprises a rock core clamping system, a true triaxial stress loading system, an acid liquor and fracturing fluid injection system, a filtration capacity measuring system and a fracturing data acquisition and processing system, wherein the rock core clamping system is used for clamping a cubic rock core sample which has the side length of 100-300mm and a simulation wellbore is embedded inside the rock core sample; the true triaxial stress loading system is used for applying stresses on the rock core sample in an X axis direction, a Y axis direction and a Z axis direction, so as to simulate a true triaxial stress state of the rock core sample; the acid liquor and fracturing fluid injection system is used for injecting acid liquor and fracturing liquid into the simulation wellbore of the rock core sample, so that crack initiation is carried out on the rock core sample and a fracture extends to simulate the fracture acidizing process of the rock core sample; the filtration capacity measuring system is used for injecting saline water into the rock sample subjected to crack initiation, thus data representing filtration capacity of the fracture of the rock core sample are measured; and the fracturing data acquisition and processing system is used for acquiring data representing a simulated crack initiation process in the rock core sample and data representing the filtration capacity of the fracture in the rock core sample, processing the data and outputting a processing result.
Owner:PETROCHINA CO LTD

Method and device for calculating effective porosity of compact oil storage layer

InactiveCN105866009ASolve the key problem of effective porosity calculationOvercome the influence of small nuclear magnetic porosityPreparing sample for investigationAnalysis using nuclear magnetic resonanceNMR - Nuclear magnetic resonanceCut off value
The invention relates to a method and a device for calculating effective porosity of a compact oil storage layer. The method comprises the following steps: preparing a saturate rock sample; performing nuclear magnetic resonance measurement on the saturate rock sample, thereby acquiring T2 point amplitude of the saturate rock sample, nuclear magnetic porosity of the saturate rock sample and total amplitude of T2 spectrum of the saturate rock sample; performing dewatering treatment on the saturate rock sample under an effect of centrifugal force and performing the nuclear magnetic resonance measurement, thereby acquiring the T2 point amplitude of the centrifugal rock sample, the nuclear magnetic porosity of the centrifugal rock sample and the total amplitude of T2 spectrum of the centrifugal rock sample; acquiring the porosity component of the T2 point of the saturate rock sample, the curve of T2 spectrum of the saturate rock sample, the porosity component of the T2 point of the centrifugal rock sample and the curve of T2 spectrum of the centrifugal rock sample; acquiring a T2 cut-off value according to the total amplitude of T2 spectrum of the saturate rock sample, the curve of T2 spectrum of the saturate rock sample, the total amplitude of T2 spectrum of the centrifugal rock sample and the curve of T2 spectrum of the centrifugal rock sample; utilizing the T2 cut-off value to acquire the valid saturability of the flowing fluid; calculating the effective porosity of the compact oil storage layer according to the valid saturability of the flowing fluid.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)

Method for calculating tight reservoir fracturing transformation volume area

ActiveCN106844909AFastSolve the problem of failure to widely promote and apply in the mining fieldGeometric CADDesign optimisation/simulationReservoir pressureChange model
The invention discloses a method for calculating a tight reservoir fracturing transformation volume area. The method comprises the following steps that multiple hydraulic fracture non-planar turning extension models, a formation stress field change model, a reservoir pressure file change model and a natural fracture failure criterion in the tight reservoir horizontal well fracturing process are established, geological parameters, horizontal well fracturing construction parameters and the total fracturing time are obtained, an initial fracture filter loss value, an initial fracture half-length value, an initial in-fracture pressure value, an initial fracture extension turning angle, initial permeability and an initial fracturing time value are endowed, all the models are calculated, and natural fracture failure point coordinate data is calculated; a spatial and numerical integration method is utilized to calculate tension failure transformation area volume and shear failure transformation area volume in a reservoir respectively, and the spaces of the two parts are united and regarded as a total transformation volume area. By adopting the method, accurate, economic and rapid tight reservoir horizontal well fracturing evaluation can be achieved, and the problem that effort, money and time are wasted in the existing tight reservoir horizontal well fracturing transformation volume area calculating process is solved.
Owner:SOUTHWEST PETROLEUM UNIV
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