This article proposes a high current density electrical discharge milling for machining Inconel 718. The proposed power supply comprises pulse generator with voltage and DC source current. pip graphite electrode the workpiece are connected to negative positive poles of supply, respectively. Benefiting from efficient flushing density, maximum material removal rate (MRR) achieved 15,062 mm3/min relative wear ratio (REWR) 1.73%. effects peak injection pressure on MRR REWR were investigated....

Small-scale true triaxial sand fracturing experiments are conducted on thin interbedded shale samples made from cores of Permian Lucaogou Formation oil reservoir in Jimsar sag, Junggar Basin, NW China. Combined with high-precision CT scanning digital core model reconstruction technology, hydraulic fracture geometry and proppant distribution reservoirs studied. The research shows that: In reservoir, the interlayer difference rock mechanics interface near wellbore cannot restrain growth height...

In some military application scenarios, Unmanned Aerial Vehicles (UAVs) need to perform missions with the assistance of on-board cameras when radar is not available and communication interrupted, which brings challenges for UAV autonomous navigation collision avoidance. this paper, an improved deep-reinforcement-learning algorithm, Deep Q-Network a Faster R-CNN model Data Deposit Mechanism (FRDDM-DQN), proposed. A (FR) introduced optimized obtain ability extract obstacle information from...

Underwater images play a critical role in underwater exploration and related tasks. However, due to light attenuation other factors, often suffer from color distortion low contrast, which some extent limit the efficiency safety of exploration. To meticulously address these issues enhance accuracy reliability exploration, this paper proposes multi-task image enhancement method based on Retinex theory. This divides task into several sub-tasks, including decomposition, correction, detail...

Summary Domestic and foreign scholars have conducted extensive research on applying machine learning to post-fracture production prediction in recent decades made great achievements Bakken, Eagle Ford, Marcellus, other large-scale oil gas fields. However, few studies focus small-sample of fractured wells, which is urgently needed small-scale newly developed reservoirs. In this work, we propose a novel framework based multitask (MTL), including multitype data collection, task selection,...

A technique of machining insulating Al2O3 ceramic with a thin copper sheet assisting electrode and high instantaneous pulse energy is developed. The process uses the peak voltage large capacitor energy, there no current-limiting resistor in discharge circuit, so explosive force are high, able to effectively machine ceramics. To further explore characteristics, single experiments have been carried out kerosene. effects polarity, capacitance, voltage, resistance on performance such as crater...

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Silicon carbide (SiC) ceramic has been widely used in modern industry for its excellent physical and mechanical properties. However, SiC is difficult to machine owing high hardness brittleness. This article presents a novel compound process that integrates end electric discharge (ED) milling grinding ceramic. The able effectively large surface area on with good quality. effect of tool polarity the machining characteristics such as material removal rate (MRR), wear ratio (TWR), roughness (SR)...

Since the production regime of shut-in after fracturing is generally adopted for wells in shale oil reservoir, a pressure drop model coupling wellbore-fracture network-reservoir oil-water two-phase flow has been proposed. The takes into account effects wellbore afterflow, fracture network channeling, and matrix imbibition exchange stop pumping. simulated log-log curve pressure-drop derivative by presents W-shape, reflecting displacement law between wellbore, matrix, divided eight main...

An analytical optimization approach of the submersible solenoid valve constrained in a specific small volume is presented. In order to maximum electromagnetic force, thermal model and are constructed, five radial dimensions optimized when main limiting quantity allowed temperature. A numerical calculation performed verify proposed approach. The optimal solution compared with approach, which shows good agreement between two methods. analysis based on AYSYS also model. comparative study...

The influence of several factors on the electrostatic dehydration process water-in-model oil emulsions in high-frequency electrical field has been studied using conductivity technique. ascending and descending periods observed versus time curves were fit to sigmoid power function, respectively, which revealed model parameters that used quantify anew efficiency (DE) index. Experiments results shown not only water content, surfactant concentration, salt concentration aqueous phase temperature...

To investigate the impact of CO 2 on rocks during whole period pre-pad energized fracturing operation for thin interbedded shale reservoir, including and well shut-in, a series laboratory triaxial experiments soaking were conducted (from Jimsar formations). In these experiments, combined with computed tomography (CT), effect fluid, horizontal principal stress difference, vertical stress, natural fractures fracture morphology studied respectively. And based X-ray diffraction (XRD) scanning...

By introducing the coupling flow expressions of main fracture-matrix, secondary fracture-matrix and fracture-secondary fracture into traditional material balance equation, "main fracture—secondary fracture—matrix" leak-off model is established. The pressure-dependent width equation wellbore injection volume are coupled to solve pressure-rate continuity problem. simulation calculation bottomhole pressure drop network closure after pump stopping in slickwater volumetric fracturing treatment...