bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on pH control of marine acid injection mixture based on linear active disturbance rejection
Authors: Gao Jianchong , Wang Guanhua , Liu Jinxiang 
Published: December 2024

Abstract
In pH control system of acid injection mixture, the flow rate is easily disturbed due to the constant change of displacement in the platform acid flow control loop and the platform water flow control loop. In this study, a control strategy is proposed, that is, both the inner and outer ring controllers are linear active disturbance rejection controllers. The controller adopts linear active disturbance rejection controller, and the pH value of the mixture is controlled by cascade ratio. On the basis of the second order controller, the second order linear active disturbance rejection controller is designed based on the electric throttle valve and mixing tank model, and the simulation platform of pH control system of acid injection mixture is built by MATLAB(MATrix LABoratory)/Simulink. The controller design and simulation results of linear active disturbance rejection control algorithm and PID(Proportional Integral Derivative) algorithm are compared respectively. The simulation results show that under the interference of external uncertainties, the designed controller can not only track pH value quickly, but also reduce the overshoot and the stability time when disturbed, and effectively improve the dynamic response performance and robustness of the system.
Intelligent interpretation and evaluation technique while drilling based on mud logging data
Authors: Du Peng , Tian Weizhi , Song Minghui , Ni Youli , Xu Zhe , Wang Hao , Chen Xi 
Published: December 2024

Abstract
With the increasing complexity of oil and gas reservoirs, the identification of reservoirs and fluid properties has become more and more difficult, which brings more challenges to hydrocarbon discovery and interpretation, economic capacity assessment, and development program formulation, and at the same time, the process of decision-making in efficient exploration and development is particularly important, which puts higher requirements on the real-time and accuracy of interpretation while drilling. At present, the recording and analysis tools are constantly enriched, showing obvious advantages in the identification and evaluation of unconventional and complex hydrocarbon formations, and accumulating a large amount of data, but the interpretation and evaluation still remain at the level of qualitative and manual interpretation. In order to better utilize the advantages of mud logging technology in interpretation while drilling, intelligent interpretation and evaluation techniques have been established, including: (1) Data depth processing-the development of four techniques, such as automatic data review and processing, full data depth correction of mud logging, multi-factor comprehensive correction of gas logging data, and fine inversion techniques for minerals while drilling, to effectively explore the effective information of the original data; (2) Data mining-the development of gray correlation sensitive parameter preference, the rapid establishment of interpretation methods and other 2 technologies, from scattered, disorderly, large amounts of data to mine key data and establish supporting interpretation methods; (3) Automatic interpretation logic-combined with the density of wells in the block, the number of oil test results, and the characteristics of mud logging technology parameters, a cyclic decision tree was established as the core algorithm, realizing the automatic interpretation of hydrocarbon formations in the drilling process; (4) Intelligent matching model-in order to realize the intelligent matching of formulas, methods, and models, a multi-tagged intelligent matching method was established, which realizes intelligent matching of all kinds of interpretation methods during the drilling process through the marking of multiple types of tags. Intelligent matching of various types of interpretation methods is achieved through multiple types of tag marking to realize intelligent interpretation while drilling. Through the research of the above technologies, the intelligent interpretation of complex hydrocarbon reservoirs in the entire drilling process, well completion and oil testing has been realized, which improves the ability of rapid, accurate and comprehensive evaluation of hydrocarbon reservoirs, and can better support the exploration and development of unconventional and complex hydrocarbon reservoirs.
Research and application of cuttings intelligent collection equipment technology
Authors: Zong Xiyu , Li Xiangyang , Gao Yan , Li Zhiwei , Jia Jin 
Published: December 2024

Abstract
The purpose of rock cuttings logging is to create a geological profile in real time and identify oil and gas shows as soon as possible, playing an irreplaceable role in the oil exploration field. However, as drilling technology has developed rapidly, geological logging has encountered production problems such as untimely rock cuttings retrieval under fast drilling conditions, difficulty in analyzing and identifying the rock cuttings under high fragmentation conditions, and high labor costs for the labor-intensive operation. The development of rock cuttings intelligent collection device fundamentally solves these technical shortcomings by utilizing the principles of electromechanical and pneumatic integration. It designs a set of functional modules for automatic rock cuttings catching, transmission, separation, cleaning, storing, element analysis, online white & fluorescence logging etc. Through the promotion of actual field application, it greatly improves the timeliness ratio of rock cuttings collection, reduces labor intensity and operational risks, and provides high-quality analytical samples for other specialized technologies such as light hydrocarbons, geochemistry and nuclear magnetic resonance. At the same time, its integrated laser-induced element analysis and online white & fluorescence logging technology effectively assists in rapid lithology naming, quantitative oil and gas identification, and precise formation interval delineation, the overall design of the equipment has industry-leading levels[1].
Integrated geology & engineering mud logging intelligent comprehensive geo-steering mode and application
Authors: Song Minghui 
Published: December 2024

Abstract
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 fully meet the construction needs of horizontal wells under complex conditions, resulting in low reservoir penetration rate and long drilling cycles of horizontal wells. Accordingly, An integrated geology & engineering mud logging geo-steering mode is constructed consisting of “geo-steering+directional drilling+drilling risk assessment+mud logging technology+remote informatization”, With geo-steering as the core, geological and engineering perspectives and comprehensive analysis have been taken into account, and intelligent analysis models have been developed to enhance analytical and decision-making capabilities. An integrated geology & engineering remote geo-steering platform has been developed to promote information sharing, intelligent analysis, and collaborative decision-making among different locations, times, and professionals. In the process of horizontal well construction, the application of this comprehensive geo-steering mode promotes the comprehensive application and analysis ability of downhole drilling data and mud logging data, with the principle of improving reservoir penetration rate, while considering the feasibility and safety of engineering trajectory, effectively reducing the construction risk of horizontal wells, and achieving the dual goals of geology and engineering. It provides strong technical support for improving the drilling efficiency and development effect of horizontal wells, and provides technical reference for the application of drilling technology in complex horizontal wells.
An improved method to extract the vibration frequency of torsional impactor
Authors: Kang Guiqiong , Chen Jie , Yao Enxiang , Cai Xiaocong , Pang Dongxiao 
Published: December 2024

Abstract
The torsional impactor can convert the kinetic energy of drilling fluid into high-frequency circumferential kinetic energy and provide it to the bottom drilling tools, thereby eliminating stick-slip vibration, protecting Polycrystalline Diamond Compact (PDC) bit and improving construction efficiency. As the test can not be directly performed and the working conditions of torsional impactor can not be quantified by using existing sensors due to the narrow space structure of the impactor and complex vibration conditions, a method for measuring the operating frequency of torsional impactor was designed based on the adaptive white noise complete set empirical mode decomposition of surface acceleration signal data and wavelet threshold denoising. In this paper, the data processing algorithm is used to implement and carry out the simulation test experiments, and the experimental results show that the method can accurately measure the vibration frequency of the torsional impactor under simulated working conditions, and effectively quantify its working state.
CGDS near-bit geosteering drilling system and its first application in Niger
Authors: Pan Xingming , Li Jiran , Sui Yuan , Tang Yuzhe , Zhang Haibo , Shi Qian 
Published: December 2024

Abstract
The Niger project is one of the important exploration and development cooperation projects of China National Petroleum Corporation in West Africa. The Dibeilla N-1 block of Agadem oilfield in Niger faces challenges such as frequent interlayers and susceptibility to encountering faults during drilling. According to the deployment requirements of the plan, the block will be developed using a mixed well network of horizontal and vertical wells, and the upper sand body will need to be developed using horizontal wells. The dogleg angle of the inclined wellbore should be controlled within 2∼4.5 (°)/30m, and the target thickness should be only 3m. Conventional guiding tools represented by MWD(Measurement While Drilling) cannot achieve effective and efficient reservoir identification and trajectory adjustment in thin oil layers due to their zero length of around 10 meters. Therefore, a geological guiding tool that can achieve near drill bit measurement is needed. Therefore, in order to successfully complete the horizontal section drilling and guidance engineering, maximize the drilling encounter rate of high-quality reservoirs, communicate favorable layers to achieve oil reservoir benefit development, it is decided to use CGDS(CNPC Geological Drilling System)near bit geological guidance tool to implement horizontal section drilling. The system is equipped with gamma, resistivity, and engineering parameter measurements at a distance of 3 meters from the drill bit, providing multiple basis for precise directional guidance of the formation. In the Dibeilla N-1 block of Niger, a total of 6 wells were applied, with an average reservoir drilling encounter rate of 85.38% and a mechanical drilling speed of 12.31 m/h. The first application of this system overseas has provided valuable experience for similar domestic work.
Control strategy for Twin-turbine generator stabilized platform based on global linearization of DC-Bus voltage
Authors: Tian Jinming , Geng Yanfeng , Wang Weiliang , Li Minglei 
Published: December 2024

Abstract
The stabilized platform is considered a crucial component for the toolface angle control of rotary steering tools. The twin-turbine generator stabilized platform (TGSP) control system aims to achieve stable voltage control of the turbine generator and servo control of the toolface angle. Existing methods, such as feedback linearization, have significant computational demands and are highly model-dependent, which limits their effectiveness under significant mud flow fluctuations. To address these shortcomings, this paper introduces a linear active disturbance rejection voltage controller (LADRC), using the square of the bus voltage as the state variable to achieve global linearization of the bus voltage. This method reduces dependence on precise mathematical models and enhances both robustness and efficiency. Simulation results demonstrate that the proposed method can achieve high-performance voltage control and servo control, providing a reference for the development of TGSP control systems.
Application of Rubber-Wheeled directional drilling rig for probing and draining holes in coal mine
Authors: Zhang Jian-rong 
Published: December 2024

Abstract
In view of the requirements of dense underground water exploration and drainage holes, high hole forming accuracy, rapid drilling rig relocation and reduced labor intensity in coal mines with trackless transportation conditions, the application of rubber wheel directional drilling rigs can well meet the requirements and complete the drilling construction. Taking the representative ZDY3500JD rubber wheel directional drilling rig as an example, the composition and basic parameters of the drilling rig are introduced, and the field application is carried out in the Shendong coal mine of the National Energy Group. The completion of the relocation greatly reduces the labor intensity of workers and improves work efficiency. It has stable performance and high hit rate in the construction of water exploration and drainage holes, and various parameters meet the design requirements, which lays a good foundation for the construction of similar mine drilling.
Influence of gas volume fraction on vortex street generation in downhole Oil-gas Two-phase flow
Authors: Huang Zhixuan , Wang Hong , Li Zhihua 
Published: December 2024

Abstract
Vortex flowmeters are suitable for measuring flow rates in downhole environments due to their stability and wide applicability. However, the variability of the downhole environment and the complexity of fluid components severely impact the accuracy of flow measurements. To address this issue, this paper employs numerical simulation methods and uses the VOF model to analyze oil-gas two-phase flow. The results indicate that in two-phase flow, vortex flowmeters can be used for measuring oil-gas mixtures, and when the gas volume fraction is within 12%, the vortex-shedding frequency exhibits a linear relationship with the gas volume fraction. Additionally, it is found that the normalized power of vortex-shedding decreases in an approximately S-shaped curve with increasing gas volume fraction. These conclusions provide guidance for the subsequent calibration of flow rate data.
Simulation of multi interval secondary protection equipment state interaction cascade detection based on random forest
Authors: Wang Yuan , Cheng Lin , Wang Ruochen , Luo Hang , Li Xingbao , Liu Fuying 
Published: December 2024

Abstract
This paper proposes a multi-interval secondary protection device state interaction cascading detection simulation based on random forest, effectively handling complex device state interaction relationships and timely detecting device state anomalies and cascading faults. We obtain the status characteristics of multi-interval secondary protection equipment, input this feature into a random forest model, construct multiple decision trees, fully utilize the correlation and interaction between features, classify the status of multi-interval secondary protection equipment, and further improve model performance by selecting appropriate weight coefficients, achieving effective detection of multi interval secondary protection equipment status. The experimental results show that the features extracted by this method can reflect the operating status of multi-interval secondary protection equipment. This method can effectively detect the interaction cascade relationship between multiple-interval secondary protection devices.
Simulation and analysis of shuttle vehicle dynamic characteristics
Authors: Wang Guochao , Li Wei , Chen Meng , Jia Chenxu 
Published: December 2024

Abstract
Because of its high efficiency, flexibility, and intensive advantages, shuttle trucks are beginning to be used in the logistics field of various industries. When the logistics shuttle trucks are involved in a collision, it will cause huge economic losses and social costs. It is of great significance to carry out the shuttle crash test to reproduce the crash response and to evaluate the safety performance of the shuttle. In order to ensure the testability and safety of the shuttle crash test, it is necessary to analyze and predict the dynamic behavior of the shuttle during the whole test process before the test. In this paper, based on NASTRAN dynamic simulation software, a multi-body dynamic simulation model of the shuttle car under acceleration, uniform speed, and deceleration is established to verify the safety and reliability of the shuttle car under normal driving. The dynamic response of the shuttle car in the collision test at a speed of 5 m/s is investigated, and the results show that the overall structural strength of the shuttle car meets the safety requirements.
Modelling three fermion generations with S3 family symmetry within ℂℓ(8)
Authors: Gresnigt N , Gourlay L 
Published: December 2024

Abstract
We present a model of three fermion generations with SU(3) ×
U(1) gauge symmetry constructed from the complex Clifford algebra ℂℓ(8), within which the discrete group S
3 acts as a family symmetry. ℂℓ(8) corresponds to the algebra of complex linear maps from the (complexification of the) Cayley-Dickson algebra of sedenions, 𝕊, to itself. The automorphism group of 𝕊 is G
2
×
S
3. We interpret S
3, suitably embedded into ℂℓ(8), as a family symmetry. The gauge symmetry SU (3) ×
U (1) is invariant under S
3. First-generation states are represented in terms of two even ℂℓ(8) semi-spinors, obtained from two minimal left ideals, related to each other via the order-two S
3 symmetry. The remaining two generations are obtained by applying the S
3 symmetry of order-three to the first generation, resulting in three linearly independent generations.
Toda field theories and Calogero models associated to infinite Weyl groups
Authors: Fring Andreas 
Published: December 2024

Abstract
Many integrable theories can be formulated universally in terms of Lie algebraic root systems. Well-studied are conformally invariant scalar field theories of Toda type and their massive versions, which can be expressed in terms of simple roots of finite Lie and affine Kac-Moody algebras, respectively. Also, multi-particle systems of Calogero-Moser-Sutherland type, which require the entire root system in their formulation, are extensively studied. Here, we discuss recently proposed extensions of these models to similar systems based on hyperbolic and Lorentzian Kac-Moody algebras. We explore various properties of these models, including their integrability and their invariance with respect to infinite Weyl groups of affine, hyperbolic, and Lorentzian types.
Effect of modified coated aluminum powder on the explosive properties of emulsion explosive
Authors: Liu Jinbao , Sun Yuzeng , Wei Xiaoan , Nan Fengqiang 
Published: December 2024

Abstract
In order to investigate the effect of aluminum powder content on the detonation properties of emulsion explosives and to reduce the emulsion of aluminum powder on the emulsion explosives to improve their service life, the paraffin-coated spherical micron aluminum powder is used to prepare the proportion of 0%, 5%, 7%, 9%, 11%, 15%, and 20% of the aluminum-containing emulsion explosives. Using the chronometer method to determine the detonation velocity, the lead column compression method to assess its brisance, and conducting underwater explosion tests to calculate parameters such as shock wave energy, bubble energy, and total energy of the aluminum-containing emulsion explosives. Additionally, high and low-temperature cyclic accelerated aging tests are performed to study the effect of aluminum powder on the service life of the emulsion explosives. The results show that aluminum powder mass fraction of 5%, containing aluminum emulsion explosive detonation velocity, is the largest, 5459m·s−1, with the increase of aluminum powder content, containing aluminum emulsion explosives detonation velocity of the overall trend of reducing. Briance first increased and then decreased, reaching a maximum value of 24.06mm in 15%. The total energy of the underwater explosion increases with the increase in aluminum powder content. In the aluminum powder mass fraction of 20% to reach the maximum, the shock wave energy increased by 26.7%, the bubble energy increased by 65.4%, and the total energy increased by 65.4%. The service life of paraffin-coated aluminum emulsion explosives is better than that of emulsion explosives containing ordinary aluminum powder service life.
Research on the process parameters and welded joint quality of resistance spot welding of aluminum composite for car bodies
Authors: Gou Weijie , Wang Lihong , Li Xian , Zhao Liquan 
Published: December 2024

Abstract
The test uses a resistance welding machine to implement resistance spot welding of 6061-T6 aluminum alloy thin plate for automobile body and obtains the welding process parameters of resistance spot welding through the test. Using an orthogonal test scheme and extreme difference analysis method to test and further optimize the resistance welding process parameters, after lap resistance spot welding of a 6061-T6 aluminum alloy thin plate with a thickness of 2 mm, we analyze the welding appearance and complete the tensile test. The test results show that when the welding current is 60 KA, the welding pressure is 0.63 MPa, the thickness of the plate is 2.00 mm, the spot weld joints obtained from the specimen have no obvious defects, better molding, good welding quality and appearance, and its tensile shear value is 5.583 KN at maximum.
Design and Improvement of Curved Envelope Meshing Pair Profile of Single Screw Compressor
Authors: Lei W , Wu W , Zhang Z , Peng C 
Published: December 2024

Abstract
In recent years, the wear problem of the wheel tooth in the single screw compressor (SSC had been solved due to the development and application of various envelope profiles. Among these profiles, the curved envelope profile shows performance advantages, which displays great application potential in the fields of high-temperature heat pump, steam compression, etc. However, SSC with curved envelop profile still faces the problem of incomplete design method, large leakage clearance, difficult processing and meshing pair interference under extreme conditions. Therefore, aiming at solving these problems, a coupling profile design method for the curved envelope meshing pair of the SSC was presented and studied. The profile equation of curved envelop meshing pair of a SSC with an ellipse profile as the characteristic line was established. The method of using standard tooth width was proposed for the quick geometric design of the SSC. The coupling profile design of the star wheel tooth angle and the groove bottom angle with variable diameter circular arc was invented. The equation of the transition arc surface of the bottom angle of the groove and the angle of the star wheel tooth was derived. It provided a theoretical basis for the design and improvement of meshing pair with curved envelop profile.