Creep testing is time-consuming and costly, leading institutions to limit the number of tests conducted to the minimum necessary for their specific objectives. By pooling data from each institution, it is anticipated ...
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Hydraulic fracturing of horizontal wells is an effective development mode for low-permeability reservoirs, while new drilling can enhance reservoir recovery. The drilling, fracturing, and production processes all indu...
ISBN:
(纸本)9781959025184
Hydraulic fracturing of horizontal wells is an effective development mode for low-permeability reservoirs, while new drilling can enhance reservoir recovery. The drilling, fracturing, and production processes all induce changes in reservoir stress, affecting the infill wells' fracture design. Adoption of finite element-based discontinuous discrete fracture numerical method. The extension of wellbore and fracture is described by dynamic mesh technology during drilling and fracturing, and the discontinuous discrete fracture model can be computed by using a conventional finite element mesh, which can be perfectly matched with the discrete fracture model, so as to realize the integrated numerical simulation of drilling-fracturing-production. Use the construction of infill wells in low-permeability reservoirs in Area 8 as an example, the integrated simulation of drilling-fracturing-production is carried out for the wells to be constructed in the encrypted well area, and the maximization of the exploitation economy of the well area guides the optimization of the infill wells' fracturing. The simulation results show that the long-term production process of the old well reduces the formation pressure and ground stress in the encrypted well area, and the direction of the maximum horizontal principal stress is deflected. Considering the influence of the old well production, the drilling fluid density during the drilling of the encrypted well can no longer be designed using the original formation pressure profile. With the drilling fluid column pressure not greater than the minimum horizontal principal stress at this stage, the direction of maximum horizontal principal stress around the encrypted well is further deflected after the wellbore is drilled open, causing the initial expansion direction of the fracture to be deflected along the wellbore;injecting water to boost the pressure of the old well prior to the fracturing of the encrypted well can improve the fracturing effec
To propose a green dyeing strategy permitting the incorporation of chromophores via the promotion of physical bonding and a simple sewage processing procedure, a strategy for increasing the reactivity of a conventiona...
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The strength and ductility cannot achieve a good tradeoff for some superalloy(***3536)prepared by selective laser melting(SLM),which seriously restricts their industrial *** work examined the effect of post-heat treat...
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The strength and ductility cannot achieve a good tradeoff for some superalloy(***3536)prepared by selective laser melting(SLM),which seriously restricts their industrial *** work examined the effect of post-heat treatment(HT)on the microstructure and mechanical properties of GH3536 produced by *** particular,the influence of carbide precipitate morphology and distribution on strength and ductility of the alloy after heat treatment was *** aging at 650°C(denoted as HT1),the Cr23C6 carbides were distributed in *** ductility increased by approximately 31%,while the strength slightly *** aging at 745°C(denoted as HT2),the Cr23C6 carbides were distributed in ***,the HT2 samples showed an increase in ductility of~58%and no reduction in *** the dislocation density of HT2 sample was higher than that of the HT1 sample,the chain carbides could be pinned to the grain boundaries,consequently improving the ductility but no loss in strength as compared with the as-deposited *** the aging temperature was increased to 900°C(denoted as HT3),the carbides were distributed in a discontinuous granular *** a result,the HT3 samples presented the lowest dislocation density which reduced the strength.
Tetracycline hydrochloride (TCN), widely recognized for its broad-spectrum efficacy and cost-effectiveness as an antibiotic, has raised significant environmental and health concerns due to its contamination in water b...
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In the implementation process of traditional horizontal wells, the degree of data sharing and collaboration among multiple specialties such as drilling, directional drilling, and mud logging are low, which cannot full...
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Both the fuel transfer control scheme and the knowledge of fuel temperature and pressure values before injection are important to a scramjet engine.A measurement method of the fluid temperature suitable for small chan...
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Both the fuel transfer control scheme and the knowledge of fuel temperature and pressure values before injection are important to a scramjet engine.A measurement method of the fluid temperature suitable for small channel is presented,and a fluid transfer control scheme of the area of injecting holes is designed using the balance equations of fluid mass,energy and entropy.A convective heat transfer experiment is conducted to evaluate the temperature measurement and the fluid transfer control design method of the heat absorbing supercritical hydrocarbon *** results show that during the heating process the injecting pressure meets the requirement,and the fluid transfer control system works *** results suggest that the design method in the present work would be useful in the design of regenerative cooling for scramjet engines.
MAPbBr3 perovskites are known for bright green surface emission. We utilize the micromachining and nanofabrication tools to alter the photoluminescence properties of this perovskite and create fluorescent patterns and...
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For the 300Mvar synchronous condenser, the static frequency converter is used to start it from 0 to 1.05 times of the rated speed for grid connection under pre-determined time. Based on the type test parameters of 300...
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Customer maintenance is of vital importance to the enterprise *** assessment and efficientprediction for customer ordering behavior can offer better decision-making and reduce business costs *** to existing studies ab...
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Customer maintenance is of vital importance to the enterprise *** assessment and efficientprediction for customer ordering behavior can offer better decision-making and reduce business costs *** to existing studies about customer behavior regularity segment and demand prediction most focus one-commerce and other fields with large amount of data,making them not suitable for small enterprises and datafeatures like sparsity and outliers are not mined when doing regularity ***,more and morecomplex network structures for demand prediction are proposed,which builds on the assumption that all thesamples have predictive value,ignoring the fine-grained analysis of different time series regularity with high *** with the above issues,a multi-step regularity assessment and joint prediction system for ordering time series *** extracting features,comprehensive assessment of customer regularity based on entropy weightmethod with the result of predictability quantification using K-Means clustering algorithm,real entropy,LZWalgorithm and anomaly detection adopting Isolation Forest algorithm not only gives an objective result to‘how highthe regularity of customers is’,filling the gap in the field of regularity quantification,but also provides a theoreticalbasis for demand prediction models *** models:Random Forest regression,XGBoost,CNN andLSTM network are experimented with sMAPE and MSLE for performance evaluation to verify the effectiveness of theproposed regularity quantitation ***,a merged CNN-BiLSTM neural network model is established forpredicting those customers with low regularity and difficult to predict by traditional machine leaning algorithms,which performs better on the data set compared to *** Forest is still used for prediction of customerswith high regularity due to its high training ***,the results of prediction,regularity quantificatio
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