Water quality monitoring of medium-sized inland water is important for environment protection given the large number small-to-medium size bodies in China. A case study was conducted on Yuandang Lake Yangtze Delta region, with a surface area 13 km2. This proposed utilising multispectral uncrewed aerial vehicle (UAV) to collect large-scale data and retrieve multiple parameters using machine learning algorithms. An alternate processing method process repetitive lake images mapping image....

As the key equipment of deep drilling, universal shaft screw drill is easily damaged due to increase eccentric torque, which significantly affects drilling efficiency, cost, and safety. However, there a lack research on failure factor analysis innovative design drill. In this study, structure mechanical characteristics existing are analyzed, it concluded that has serious stress concentration fatigue damage high torque. Then, area mechanism were determined by finite element life prediction....

Abstract Downhole drilling operations expose all-metal positive displacement motors (AMPDM) to abrasives of different sizes, causing serious abrasive wear behavior. Controlling the entry large particles into motor by installing a filter can effectively reduce conditions and improve its lifespan. This study investigated particle size effect on seek an appropriate for AMPDM. The multi-function tribo-tester was modified according actual working stator rotor. tribological properties material...

Currently, deep drilling operates under extreme conditions of high temperature and pressure, demanding more from subterranean power motors. The all-metal positive displacement motor, known for its robust performance, is a critical choice such drilling. dimensions the PDM are crucial performance output. To enhance this, optimization motor's profile using genetic algorithm has been undertaken. design process begins with computation initial stator rotor curves based on equations screw cycloid....

Threaded joints are key components of core drilling tools. Currently, tools generally adopt the thread structure designed by API Spec 7-1 standard. However, fractures easily occur in this due to high stress concentrations, resulting downhole accidents. In paper, according needs large-diameter drilling, a barrel joint was with an outer diameter Φ135 mm and trapezoidal profile. Subsequently, three-dimensional simulation model established. The influence external load, connection state on...

Abrasive water jet technology has been widely used to process fine structures on various materials, but there is no complete model that can describe the entire process. In this paper, integral modeling of abrasive micro-machining (AWJM) presented. The three-phase fluid dynamics inside nozzle and surface evolution are connected by theoretically calculating erosive efficacy distribution before impacting workpiece. Several improvements over previously presented models, such as taking into...

The rotational state of the downhole motor is critical for monitoring its operational condition. In this work, a self-powered multifunctional sensor (hereafter referred to as SPMS) proposed monitor speed, angle, and direction rotation without external power supply. experimental results show that SPMS can measure speed in range 0–750 r/min with an error rate less than 2% excellent linearity. addition measurement function, it also angle resolution 22.5°. Furthermore, possibility converting...

Abstract High‐speed water jets are key technologies for increased production efficiency in oil drilling, and high‐speed self‐excited oscillating pulsed (SEOPWs) offer many advantages compared to continuous most industrial applications. Therefore, studies have focused on this topic. However, the current hydraulic rarely extended integrated modeling of jet transmission process. To better apply SEOPWs, based fluid mechanics, theoretical model plunger pump–pipeline–nozzle is established,...

The machines that utilize the synchronization of vibrators, such as pile sinkers, breaking hammers and sonic drilling rigs, play an important role in municipal construction resource exploration. In this paper, a novel hydraulic coupling system with large specific power, handy control robust stability for vibrator is presented. To investigate feasibility precision vibrators system, mathematical model established. According to model, characteristics two are discussed when errors their masses,...

Slurry erosion of clearance fits is one the primary reasons for decline in performance downhole tools. In this study, slurry experiments and computational fluid dynamics simulations were performed to understand effect particle impact velocity as well mechanisms on surface 38CrMoAlA steel. The results indicated that uneven erosive wear occurred along flow direction material. can be attributed variation angle affected by streamlines. site area most severe changed arising from velocity. failure...

In response to the testing requirements of downhole positive displacement motor (PDM), this research proposes a self-powered multifunctional sensor based on triboelectric nanogenerator that can simultaneously measure rotating speed, angle and abrasion. Tests, including speed measurement tests, abrasion tests reliability were respectively tested after is manufactured. Speed results show range 0 900 r/min, error less than 3%, maximum output voltage amplitude reach 5.5 V. Angle minimum...

The bypass valve of a positive displacement motor is key component for regulating the bottom hole pressure and ensuring normal circulation drilling fluid during process. Severe erosion damage to significantly affects service life motor, yet there currently lack related research. In this research, flow characteristics inside core were analyzed through field simulation, main factors influencing investigated. results indicate that side holes channel structure are causes erosion. Based on this,...