Summary The rotary steerable drilling system is an advanced technology, with stabilized platform toolface attitude control being a critical component. Due to multitude of downhole interference factors, coupled nonlinearities and uncertainties, challenges arise in model establishment control. Furthermore, considering that determines the direction entire drill bit, effectiveness will directly impact precision success tool guidance. In this paper, mathematical friction are established, improved...

In the process of drilling, severe downhole vibration causes attitude measurement sensors to be erroneous; errors will accumulate gradually during inclination calculation. As a result, ultimate well path could deviate away from planned trajectory. order solve this problem, paper utilized stochastic resonance (SR) and chaos phase transition (CPT) produced by second-order Duffing system identify frequency estimate parameters signal while drilling. Firstly, idea variable-scale is introduced in...

A Deep Deterministic Policy Gradient with Extended State Observer (DDPG_ESO) method is proposed to address control accuracy and robustness issues in the attitude of stabilized platforms for rotary steerable systems. nonlinear extended state observer developed estimate total system disturbance, which then integrated into a deep reinforcement learning framework enhance controller's adaptive capabilities. The controller trained using variable amplitude frequency external disturbances improve...

To identify downhole command signals accurately and efficiently with negative fluid pulse intervals in the rotary steerable drilling engineering solve complex operation high error rate problems identification explanation process of receivers, this paper presents a signal method based on similarity principle. In method, instructions expressed by width are obtained comparing self-correlation degree sampling amplitudes at each interval, compared interval according to fixed rule, is achieved...

Traffic sign detection in the natural environment with small targets, weak light and other influencing factors often make neural network has low accuracy process. In view of above problems, this paper proposes an improved YOLOv7-WCN based on YOLOv7. Firstly, improvement YOLOv7 is added to backbone enrich image information terms improvements YOLO v7 network, CHB module order information. Then, normalization-based attention (NAM) introduced pay more target region for purpose enhancement....

In view of the problems missed detection and low accuracy SSD model in small targets, an improved for traffic road sign recognition was proposed. The uses DenseNet to replace SSD's basic network VGG16 reduce amount parameters; learn from feature fusion method FCN improve ability targets; increase convolution holes expand perception domain loss target information; use depth Separable replaces Maxpooling layer avoid information during extraction. Experiments were carried out on CTSD data set....

A rotary steerable drilling system is an advanced technology, with stabilized platform tool face attitude control being a critical component. Due to multitude of downhole interference factors, coupled nonlinearities and uncertainties, challenges arise in model establishment control. Furthermore, considering that determines the direction entire drill bit, effectiveness nonlinear disturbances, such as friction interference, will directly impact precision success guidance. In this study,...

The bifurcation and chaos should exist in Boost converter while the circuit stability conditions are not satisfied，and stable state could be gotten by its self control power. As a kind of OGY method without feedback，the parameter resonance can converter. Based on current controlled circuit，the regulating process power discussed with reference value inductor as resonant parameter，and characteristic parameters also deduced detail. different voltages analyzed for circuits，so to realize precise...

In rotary steerable drilling system, there should be a downward communication channel to send the guided control command from ground monitor downhole steeling tool. The word has been transmitted by negative pulse of mud fluid and encoded characteristic three-descending three-ascending. Downward receiving function in tool detects change underground flow; then gets rightly processing interpretation software. Several different measures are used device for improve reliability anti-interference...

Abstract In practice, the near-bit drilling tool confronts with strong vibrations and high-speed rotation. Therein original signal amplitude of attitude measurements is relatively feeble, signal-to-noise ratio (SNR) exceptionally low. To handle this issue, paper proposes a weak SNR extraction method, frequency selecting complementary ensemble empirical mode decomposition, which based on decomposition combining noise selecting. This method firstly adds different positive negative pairs...

In practical, the signal to noise ratio (SNR) for near bit signals is extremely low. To address this problem, empirical mode decomposition (EMD) proposed be applied extraction of weak SNR from downhole bits. EMD detects local extremes iteratively, interpolates neighboring get accurate upper and lower envelopes, then takes mean value envelopes subtracts them original a set eigen values that meet specific conditions. Intrinsic function (IMF) values, will properly selected reconstruction...

Abstract In this paper, a drilling engineering simulation system is designed and developed aiming at some problems existing in traditional well control safety operation training. The overall design process of the virtual were given, optimized rendered models equipment wellsite scene created using software 3Ds Max. With aid Unity3D development platform, oil was constructed, which realized interaction between roaming operations. has characteristics low cost, strong real-time interaction,...

The existence of non-linear characteristic friction torque to the control axis can not be ignored in rotary steering drilling steady platform control. causes producing system were analyzed step by based on structure system. theoretical derivation and numerical analysis performed bearing torque, viscous pulsating impacts torques studied through experiments simulations. Approaches reduce effects recommended. These provide a basis for decision-making platform.

There is a clear non-linear characteristic of friction torque to the control axis on stable platform system. Based structure this system, article establishes basic model system and disk valve torque. For torque, integral sliding mode controller was designed, an adaptive presented realize estimation uncertain disturbances. Simulation results show that method effective solution nonlinear attitude control. The takes strong robustness load disturbance parameter perturbation. outcome such...

宽输入范围的Boost电路会跨越稳定和不稳定工作区，产生的混沌现象导致电路工作异常．以连续电流传导模式为基础，讨论Boost电路的参数正弦扰动调整与镇定过程，分析稳定状态和不稳定状态在不同正弦扰动幅度下的相互转化过程，推导电路工作状态转化的临界条件，研究宽输入范围时电路的可稳定条件．数字仿真说明参数正弦扰动不仅可以抑制不稳定电路的混沌现象，也可以使本身稳定的电路进入不稳定状态．对宽输入电压范围的Boost电路，可在一定区域内选择合适的扰动幅度，保证电路稳定可靠地起动、调整和镇定．

Based on the multiplication of dynamic eigenvalue coefficient and its stabilizing capability, fast-scale instability asymmetry in power factor correction (PFC) Boost converter with continuous peak current control mode are investigated. To realize higher less harmonic distortion, a kind compensation strategy is proposed to make input sinusoidal wave, it optimized parameter resonance. The formulas deduced,and overall optimization carried out. results digital simulation shows that compensating...

Abstract A sliding mode variable structure control based on disturbance observer (SMVSCDOB) has proposed to tackle the uncertainty caused by friction in stabilized platform rotary steerable drilling. Disturbance (DOB) is used estimate platform, and estimated value compensated (SMVSC) improve accuracy. The simulation experiment of system carried out with MATLAB, comparing SMVSCDOB method proportional integral derivative (PID), PID+DOB, SMVSC. results show that can better track tool face...

Abstract Aiming at the problem of singularity and mutation points after wavelet denoising with improved layered threshold when downlink signal received in downhole rotary steering drilling, a bilayer filtering method based on singular value decomposition is proposed. This combines denoising, adopts WT-SVD to construct matrix signal, then performs recovery signal. The number selected values structure reconstruction were determined through experiments, waveforms, signal-to-noise ratio, root...