14 results about "Micro fracture" patented technology

The invention provides an electric imaging logging-based dense glutenite micro-crack automatic identification method, which comprises the steps of 1, preprocessing electric imaging logging original data, 2, carrying out interpolation restoration on blank stripes between polar plates in an electric imaging image, 3, carrying out sliding processing on a whole-well-periphery dynamic imaging image, and 4, carrying out sliding processing on the whole-well-periphery dynamic imaging image. The method comprises the following steps of 1, setting a feature extraction algorithm and corresponding different radiuses, 2, marking a training set, 3, setting a classifier, 4, training the classifier, 8, calculating parameters of the microcracks, and 9, generating a result map. The method provides powerful technical support for reservoir evaluation, exploration and development of compact glutenite.

This invention relates to the field of source-end reservoir formation simulation technology, specifically a simulation device based on the effect of microfracture number on source-end reservoir formation efficiency. The device includes a test platform, an experimental chamber, and a fracture-forming assembly. An experimental chamber is fixed to the upper side of the test platform, and a loading container containing reservoir samples is placed inside. A borehole is vertically drilled at the center of the reservoir sample, and an injection mechanism slides through the borehole. A storage tank is located on one side of the test platform, connected to the injection mechanism via a delivery pump. A pressure-applying assembly is positioned on the upper side of the reservoir sample, capable of compressing the upper surface of the sample. This invention features a reasonable and compact structure, is easy to use, and allows for the injection of oil and gas into the reservoir sample using the injection mechanism, thereby artificially controlling the distribution of oil and gas to form specific reservoirs. The pressure-applying assembly simulates ground pressure movement, and the fracture-forming assembly assists in the formation of flow fractures within the reservoir sample, enabling multi-faceted experimental simulations.

The utility model belongs to the technical field of medical instruments, and particularly relates to a side cutting dental drill for dental implantation, which comprises a connecting part and a cutting part axially arranged at one end of the connecting part, and a plurality of spirally distributed chip grooves are arranged from the front end of the cutting part to the tail end connected with the connecting part. Spiral side cutting edges which are distributed along the chip grooves and act in the circumferential direction are arranged between the adjacent chip grooves, and a plurality of tooth-shaped side cutting edges acting in the axial direction are arranged on the spiral side cutting edges. Through multiple cutting-in of the spiral side cutting edge and the axial tooth-shaped fine cutting edge, smooth and uniform cutting can be achieved on the side wall of the alveolar bone, side wall burrs and micro-cracks are reduced, the forming quality of the side wall of an implant nest is remarkably improved, and tight attachment of an implant and bone tissue is facilitated. Due to the geometric angle of the side cutting blade peak and the side cutting invasion blade, the cutting force is more concentrated and sharp, the side cutting resistance and the vibration amplitude are reduced, the hand feeling of a doctor is improved, and meanwhile the operation vibration feeling of a patient in the side cutting stage is reduced.

The invention discloses a fracturing method for reducing fracture disturbance fault influence, which comprises the following steps of: determining the maximum displacement and the maximum injection liquid amount of first-section fracturing construction according to fault type, fault extension condition, distance between fault and fracturing section and micro-fracture development degree, performing first-section fracturing construction by taking supercritical carbon dioxide as preposed liquid, and performing second-section fracturing construction by taking supercritical carbon dioxide as preposed liquid; determining the minimum time interval of the adjacent construction sections according to the distance between the fault and the fracturing sections, the spatial distribution of the microseism events monitored in the fracturing construction of the first section and the development degree of the microfractures between the two fracturing sections and the fault; re-checking the micro-fracture development degree between the fracturing section and the fault, and determining the maximum displacement and the maximum liquid injection amount of the fracturing construction of the second section; and second-section fracturing construction is conducted based on the minimum time interval, and the steps are repeated till fracturing construction of all sections is completed. The method can be directly applied to an oil and gas development site, the disturbance influence of fracturing on a fault is greatly reduced, and the purpose of safe fracturing is achieved.

The invention discloses a low-temperature repair-resistant reinforced anti-cracking additive and a preparation method thereof, and belongs to the technical field of concrete repair materials. The additive is composed of a matrix component, a functional additive and an active repairing component according to the mass ratio of 80: (5-10): (5-10). The matrix component comprises sulphoaluminate cement clinker and composite mineral filler; the functional additives comprise modified nano silicon dioxide, polymer rubber powder, an organic anti-freezing agent and anti-cracking fibers; the active repairing component comprises a microbial capsule type self-repairing material and an internal curing agent, wherein a microbial capsule comprises sporosarcina pasteurii and bacillus urealyticum. Through the synergistic effect of the microbial capsules and the modified nano silicon dioxide, efficient self-repairing of concrete microcracks in a low-temperature freeze-thaw environment is achieved, meanwhile, the early strength, freezing resistance, crack resistance and durability of concrete are remarkably improved, and the concrete is especially suitable for protection and repairing of concrete structures in alpine regions.

The invention relates to the technical field of geology, in particular to a compact sandstone reservoir microfracture prediction method and system, and the method comprises the steps: data preparation and feature extraction, physical constraint model construction, semi-supervised model training and microfracture density prediction. Compared with the prior art that original seismic attributes are generally directly input into a machine learning model, so that a model learning target is not clear, and the physical significance of a prediction result is fuzzy, the method adopts a scheme of pre-extracting an elastic modulus frequency dispersion attribute as a core input feature based on an equivalent embedded body stress averaging theory; the method has the advantage of ensuring that input characteristics and micro-fracture development have clear rock physical mechanism association from the source, equivalently, a high-quality information source after physical purification is provided for the model, and the geological pertinence and interpretability of a prediction result are greatly improved.

The invention provides a characterization method for development degrees of natural fractures of different scales, relates to the field of oil exploitation, and aims to comprehensively and accurately characterize the development degrees of the natural fractures of different scales, especially to solve the problem of small and micro fractures in shale oil reservoirs. The method is realized through the following steps of: firstly, dividing crack types based on core observation in combination with a focused ion beam-scanning electron microscope technology; secondly, analyzing response characteristics of the cracks in electric imaging logging, array acoustic logging and conventional logging; thirdly, constructing a crack identification sample library containing the features; and finally, constructing an intelligent crack evaluation model by applying a grey correlation algorithm to obtain a crack development index. According to the method, large-scale structural cause cracks and tiny non-structural cause cracks are distinguished, crack classification can be refined, the recognition capacity is complemented through multiple well logging technologies, and the recognition precision is improved. Compared with the prior art, the method has the advantages that the accuracy of crack identification is greatly enhanced, and reservoir assessment and fracturing design are optimized.

This invention discloses a design method for multi-fracture fracturing with in-fracture temporary plugging, comprising: simulating the construction parameters and fracture parameters required for the temporary plugging stage using fracturing software; calculating the average dynamic main fracture width; calculating the plugging slug length, plugging agent dosage, and plugging agent particle size; adding a low-density, low-temperature soluble temporary plugging agent at the beginning of the temporary plugging to achieve dynamic main fracture bridging and pressure increase, opening lateral natural microfractures or branch fractures; at the end of the temporary plugging, using low-viscosity fracturing fluid with ultra-low-density small-particle-size proppant to support the natural microfractures; and after the temporary plugging is completed, carrying out main fracturing operations, using large-particle-size proppant for dynamic main fracture filling. This invention is designed for oil wells with high recovery rates in old fractures, achieving orderly filling of secondary and main fractures, thereby improving the effectiveness of multi-fracture fracturing.

The application provides a barite powder-based drilling fluid downhole fracture plugging effect three-dimensional CT image evaluation method, and belongs to the field of petroleum engineering, and comprises the following steps: obtaining a three-dimensional CT image of a fracture-matrix core model; identifying a micro-fracture topological structure in the three-dimensional CT image, adding a sealing agent material and a barite powder-based drilling fluid; quantitatively evaluating a micro-fracture filling effect based on the fracture-matrix core model, equivalently treating matrix pores as internal micro-fractures of the rock, and counting micro-fracture porosities of each layer; constructing a three-dimensional reconstruction evaluation model, analyzing a plugging effect, calculating an error rate of an average porosity in a two-dimensional image and a porosity of fracture filling reconstruction of the three-dimensional core model, establishing a complete evaluation technical system, improving the accuracy of fracture plugging effect evaluation, and realizing accurate characterization of a complex fracture network; and innovatively proposing a treatment method of equivalently treating matrix pores as internal micro-fractures of the rock, and realizing multi-scale integrated analysis.

The application discloses a fracturing method for reducing the influence of fracturing on a fault, and comprises the following steps: according to the fault type, the fault extension, the distance between the fault and the fracturing section and the micro-fracture development degree, the maximum displacement and the maximum injection liquid volume of the first section fracturing construction are determined; supercritical carbon dioxide is used as a pre-fluid to perform the first section fracturing construction; according to the distance between the fault and the fracturing section, the microseismic event spatial distribution monitored in the first section fracturing construction and the micro-fracture development degree between the two fracturing sections and the fault, the minimum time interval of the adjacent construction section is determined; the micro-fracture development degree between the fracturing section and the fault is rechecked, the maximum displacement and the maximum injection liquid volume of the second section fracturing construction are determined; the second section fracturing construction is performed based on the minimum time interval; and the above steps are repeated until the fracturing construction of all sections is completed. The application can be directly applied to an oil and gas development site, greatly reduces the influence of fracturing on the fault, and achieves the purpose of safe fracturing.

This invention relates to the field of oil and gas field development and discloses a model construction method and system for multi-scale characterization of microfractures in compacted clastic rocks. The method includes: preparing artificial rock cores under simulated formation depth and pressure conditions within a reactor mold; simultaneously acquiring acoustic wave data axially passing through the artificial rock core during the compaction process; injecting epoxy resin adhesive into the artificial rock core after preparation; and slicing the artificial rock core to obtain corresponding cast thin sections after the adhesive has completely solidified; acquiring a full-view image of the cast thin sections and obtaining the number of fractures, fracture width, number of gravels, and surface fracture ratio from the full-view image; acquiring the number of acoustic pulse frames to obtain acoustic pulse frame images corresponding to different simulation depths; projecting the obtained surface fracture ratio onto the acoustic pulse frame image based on the same simulation depth conditions, and then correlating it with the full-view image of the cast thin sections to obtain a joint distribution model of image-surface fracture ratio-acoustic pulse frame number corresponding to the simulation depth, which is the final model.

The present application relates to the technical field of oil and gas well cementing engineering, and particularly relates to a cementing cement microcrack self-repairing material, a preparation method and application thereof. The cementing cement microcrack self-repairing material is prepared by using an emulsion copolymerization method, and the raw material composition comprises the following components in parts by weight: deionized water 30 parts, monomer 3-12 parts, crosslinking agent 0.03-0.09 parts, initiator 0.06-0.3 parts, natural latex 3-20 parts, surfactant 1.5-3 parts, and filler 0.03-1.5 parts. The self-repairing material obtained by the present application has high liquid absorption rate in a weak acid solution, high swelling rate in the presence of carbon dioxide, and excellent mechanical properties. The self-repairing material can be added into a cementing fluid system, and is used in the environment of supercritical CO2 and CO2 formation water, two kinds of corrosive media in a water-wet environment, to seal the leakage channel of a wellbore and improve the sealing integrity of the wellbore.

The present application relates to a kind of reservoir microfracture activation and extension oil displacement microspheres and its preparation method, oil displacement method, oil displacement microspheres are used to inject reservoir after reconstructing deep percolation network, the oil displacement microspheres are three-layer composite structure, from outside to inside, structural protection outer layer, delay response control middle layer, energy conversion core in sequence, wherein the structural protection outer layer adopts temperature-resistant, pressure-resistant, shear-resistant crosslinking polymer to form closed shell, for guaranteeing the structural integrity of injection stage oil displacement microspheres;The delay response control middle layer adopts reservoir environment response type material, for guaranteeing sealing property in storage stage, control delay release time;The energy conversion core is used to form microscale transient stress pulse, only realizes microfracture opening and extension, without macroscopic destructive burst.The present application is aimed at low permeability and tight reservoir development pain point, can realize microfracture reopening, extension and interconnection, improve reservoir equivalent permeability and displacement swept volume, finally improve oil recovery.