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| 1 | Numerical modeling of DPSK pressure signals and their transmission characteristics in mud channels显示文摘A numerical model and transmission characteristic analysis of DPSK(differential phase shift keying)pressure signals in mud channels is introduced.With the control logic analysis of the rotary valve mud telemetry,a logical control signal is built from a Gate function sequence according to the binary symbols of transmitted data and a phase-shift function is obtained by integrating the logical control signal. A mathematical model of the DPSK pressure signal is built based on principles of communications by modulating carrier phase with the phase-shift function and a numerical simulation of the pressure wave is implemented with the mathematical model by MATLAB programming.Considering drillpipe pressure and drilling fluid temperature profile along drillpipes,the drillpipe of a vertical well is divided into a number of sections.With water-based drilling fluids,the impacts of travel distance,carrier frequency,drillpipe size,and drilling fluids on the signal transmission were studied by signal transmission characteristic analysis for all the sections.Numerical calculation results indicate that the influences of the viscosity of drilling fluids and volume fraction of gas in drilling fluids on the DPSK signal transmission are more notable than the others and the signal will distort in waveform with differential attenuations of the signal frequent component. | Shen Yue Su Yinao Li Gensheng Li Lin Tian Shouceng | 2009 | Petroleum Science2009，6，3： | 11 |
| 2 | Research and application of water jet technology in well completion and stimulation in China显示文摘In recent years, rapid progress in the use of high pressure water jets (HPWJ) has been made in oil and gas well drilling, completion, and stimulation; and good results have been achieved in field applications. Advances in technologies and developments of well completion and stimulation with hydrajet are reviewed in this paper. Experiments were conducted to study the characteristics of abrasive water jetting and to optimize jet parameters, which can provide methods for the well completion and hydrajet fracturing. Deep-penetrating hydrajet perforating can create a 2-3 m clean hole with a diameter of 20-35 mm. Multilayer hydrajet fracturing is a process whereby multiple layers are stimulated in a single run without using mechanical packers, thereby reducing operation procedure and risk. Multilateral radial wells can be drilled using hydraulic jetting up to 100 m in length. The technique to remove sand particles and plugs with rotating self-resonating cavitating water jets in horizontal wellbores has been developed and oilfield-tested, which shows promising, cost effective prospects. | Li Gensheng Huang Zhongwei Tian Shouceng Shen Zhonghou | 2010 | Petroleum Science2010，7，2： | 9 |
| 3 | RESEARCH AND APPLICATION OF AS-CAST WEAR RESISTANCE HIGH CHROMIUM CAST IRON显示文摘RESEARCHANDAPPLICATIONOFASCASTWEARRESISTANCEHIGHCHROMIUMCASTIRONLiuJinhaiLiuGenshengLiGuoluHebeiUniversityofTechnologyWangKu... | Liu, Jinhai Liu, Gensheng Li, Guolu Wang, Kunjun Zeng, Daben | 1998 | Chinese Journal of Mechanical Engineering1998，11，2： | 6 |
| 4 | Settling behavior of non-spherical particles in power-law fluids:Experimental study and model development显示文摘Solid-particle settling occurs in many natural and industrial processes, such as in the transportation of drilling cuttings and fracturing proppant. Knowledge of the drag coefficient and settling velocity of cuttings and proppant is of significance to hydraulics design, wellbore cleanout, and fracture optimization. We conducted 553 tests to investigate the settling characteristics of spherical and non-spherical particles in power-law fluids. Three major particle shapes (spherical, cubic, and cylindrical) and eight different particle sphericities were used to simulate cuttings and proppant, and power-law fluids were applied to simulate drilling and fracturing fluids. Based on the data analysis, a new drag coefficient-particle Reynolds number correlation was developed to determine the drag coefficient in a power-law fluid for spherical and non-spherical particles. The drag coefficient increases as the sphericity decreases for the same particle Reynolds number. For a specific particle shape, the drag coefficient decreases as the particle Reynolds number increases, but the decreasing trend is reduced at high particle Reynolds number conditions. An explicit settling-velocity equation was proposed to calculate the settling velocity of spherical and non-spherical particles in power-law fluids by considering the effect of sphericity. A suitable range for the proposed model is 0.0001 < Re <200, 0.471 <φ< 1, and 0.505 < n < 1. An illustrative example is presented to show how to calculate the drag coefficient and settling velocity in power-law fluids with given particle and fluid properties. | Zhengming Xu Xianzhi Song Gensheng Li Zhaoyu Pang Zhaopeng Zhu | 2019 | Particuology2019，17，5： | 6 |
| 5 | Theoretical and experimental study of the pulling force of jet bits in radial drilling technology显示文摘Radial drilling technology,of which the jet bit is the key device,is a research focus in the field of oil drilling and production.This paper establishes mechanical equations for jet bits and analyzes the hydroseal of backward jets in bottom holes.Meanwhile this paper establishes a mechanical equation for a high pressure hose and analyzes the axial force distribution.Laboratory experiments indicate that the flow rate,the angle between the backward nozzle axis and the jet bit axis,and the hole diameter are the major influencing factors;the generation of the pulling force is mainly due to the inlet pressure of the jet bit;the backward jets can significantly increase not only the pulling force but also the stability of jet bits.The pulling force would reach 8,376 N under experimental conditions,which can steadily pull the high-pressure hose forward. | Ruichang Guo Gensheng Li Zhongwei Huang Shouceng Tian Xiaoning Zhang Wei Wu | 2009 | Petroleum Science2009，6，4： | 5 |
| 6 | Mechanisms and field test of solution mining by self-resonating cavitating water jets显示文摘Rapid solution mining is the key to cavern construction in salt formations. Rapid solution mining technology with self-resonating cavitating water jets is described in this paper. It can generate three main physical effects: helical flow dissolution, self-resonating cavitating jet erosion, and ultrasonic waves. A self-resonating cavitating nozzle was also designed with the principles based on theory of fluid transients and hydro-acoustics. Under ambient pressure, the experimental results show that the impulse amplitude of pressure reaches a peak at a standoff distance of 5-13 times the nozzle outlet diameter and the cutting ability of self-resonating cavitating jets is twice that of conventional jets under the same conditions. Compared with the conventional mining method, the field test indicates that rapid solution mining technology with self-resonating cavitating jets can speed the construction by more than 2 times at the pocket stage of cavern development. | Song Xianzhi Li Gensheng Yuan Jinping Tian Zhonglan Shen Ruichen Yuan Guangjie Huang Zhongwei | 2010 | Petroleum Science2010，7，3： | 5 |
| 7 | Mechanism and numerical simulation of pressure stagnation during water jetting perforation显示文摘当与一口磨料水喷气穿孔时,因为水喷气靠着洞墙爆炸,洞(穿孔) 里的压力将在体环比那高,是可能的,它也是水疗院喷气断裂的技术的理论基础。这份报纸分析在水喷气洞里产生压力停滞的机制,并且提出 hydroseal 的一个新概念。然后,洞里的压力的分发与有限元素方法被模仿。模拟结果证明洞里的压力在体环比那高。另外,更低环形的压力(限制压力) 并且越高爆炸压力,越 greater 压力差别。显示的一个实验水泥样品被提起在上面在压力下面,洞里的停滞,它证明了有限元素模拟显然结果。 | Huang Zhongwei Li Gensheng Tian Shouceng Shen Zhonghou Luo Hongbin | 2008 | Petroleum Science2008，5，1： | 5 |
| 8 | Shale gas exploitation with supercritical CO_2 technology显示文摘This paper analyzes the physicochemical properties of supercritical CO2, the characteristic of shale gas and shale gas reservoirs. The technologies of drilling, production, fracturing using the supercritical CO2 in shale gas exploration are proposed, to increase the penetration rate, decrease the damage to formation while fracturing, and enhance the recovery of shale gas. It is believed that the huge economic benefits of shale gas exploration with the supercritical CO2 fluid will be obtained, and it also can initiate a new technology field of CO2 in the petroleum engineering. | Wang Haizhu Shen Zhonghou Li Gensheng Tian Shouceng Cheng Yuxiong | 2012 | Engineering Sciences2012，10，4： | 5 |
| 9 | Research and applications of novel jet techniques in well drilling,completion and fracturing显示文摘Oil and gas have long been regarded as key elements for any industrialized country.China's economy and social security are largely dependent on oil and gas exploration and development.Nowadays,a great deal of attention has been paid to various ways of efficiently developing oil and gas reserves.This paper presents an overview of research and applications of novel jet techniques in well-drilling,well-completion and fracturing.Supported by the National Natural Science Foundation of China,through years of effort,significant achievements have been made in this area.Not only has the systematic theory of novel jetting been established,but also its application has been proved practical in petroleum engineering.This paper focuses on the topics of the self-resonating cavitating jet,the abrasive water jet,and the supercritical CO_2 jet,in respect of theories,applications and prospects. | LI GenSheng SHEN ZhongHou HUANG ZhongWei TIAN ShouCeng SHI HuaiZhong SONG XianZhi WANG HaiZhu | 2014 | Science Foundation in China2014，22，2： | 3 |
| 10 | Settling behavior of spherical particles in vertical annulus:Experimental study and model development显示文摘Coiled tubing(CT)drilling technology offers significant advantages in terms of cost and efficiency for exploitations of unconventional oil and gas resources.However,the development of CT drilling technol-ogy is restricted by cuttings accumulation in the wellbore due to non-rotation of the drill string and limited circulating capacity.Cuttings cleaning becomes more difficult with the wall resistance of pipe-wellbore annulus on the cutting transport.Accurate description of particle transport process in the pipe-wellbore annulus is,therefore,important for improving the wellbore cleanliness.In this study,high-speed cam-era is used to record and analyze the settling process of particles in the transparent annulus filled with power-law fluids.A total of 540 tests were carried out,involving dimensionless diameters of 0.10-0.95 and particle Reynolds Numbers of 0.01-12.97,revealing the effect of the dimensionless diameter and particle Reynolds number on the annulus wall effect,and the wall factor model with an average relative error of2.75%was established.In addition,a dimensionless parameter,Archimedes number,independent of the settling velocity,was introduced to establish an explicit model of the settling velocity of spherical particles in the vertical annulus,with the average relative error of 7.89%.Finally,a calculation example was provided to show how to use the explicit model of settling velocity in annulus.The results of this study are expected to provide guidance for field engineers to improve the wellbore cleanliness of coiled tubing drilling. | Zhaopeng Zhu Mengmeng Zhou Xianzhi Song Shuo Zhu Gensheng Li Zhengming Xu Xuezhe Yao Buwen Yu | 2022 | Particuology2022，20，9： | 2 |
| 11 | Throttle characteristics of multi-stage circumfluence nozzle during the separate-layer injection of CO_(2)显示文摘Separate-layer injection of CO2 is an important method to improve oil and gas production and recovery.Conventional single-stage nozzle is usually blocked by impurities,and the ice-barrier phenomenon is very common.To solve this problem,large-diameter multi-stage circumfluence nozzle was designed to release pressure stage by stage.In order to illuminate the throttle characteristics of the CO2 multi-stage circumfluence nozzles,numerical simulation was performed to test several nozzles with different diameters and stage numbers.Furthermore,we tested the throttle characteristics through laboratory experiments and obtained the effects of several critical parameters such as nozzle diameter,number of stage and pressure drop on the throttle characteristics.The results show that the flow rate decreases as the nozzle stage increases on the condition of constant pressure and nozzle diameter.And pressure difference increases as nozzle stage number increases under the constant flow rate.The throttle capability of multi-stage circumfluence nozzles was much better than the concentric nozzles.Large-diameter multi-stage nozzle is recommended rather than small-diameter single-stage nozzle during the process of separate-layer injection,which can efficiently prevent impurities and ice blocking.The results are expected to provide a theoretical support for the nozzle choice of separate-layer injection of CO2. | Haizhu Wang Gensheng Li Lichuan Zhao Youwen Wang Yun Liu Qingling Liu Meng Wang Fei Gao Meng Cai | 2018 | Petroleum2018，4，2： | 2 |
| 12 | Key problems and solutions in supercritical CO2 fracturing technology显示文摘Supercritical CO2 fracturing is considered to be a new method for efficient exploitation of unconventional reservoirs,such as shale gas,coal bed methane,and tight sand stone gas.Supercritical CO2 has many special properties including low viscosity,high diffusion coefficient,and lack of surface tension,which brings about great advantages for fracturing.However,these properties also cause several problems,such as difficulty in proppant transportation,high friction loss,and high pump displacement.In this paper,the above problems were analyzed by combining field test with laboratory study and specific solutions to these problems are given.The high frictionloss in the pipeline could be reduced by developing a new drag reducing agent and selecting large-size casing.Besides,for the problem of poor capacity in proppant carrying and sand plug,the methods of adding tackifier into supercritical CO2,increasing pump displacement and selecting ultralow density proppants are proposed.Moreover,for the problem of fast leak-off and high requirement for pump displacement,the displacement can be increased or the pad fluid can be injected into the reservoir.After solving the above three problems,the field test of supercritical CO2 fracturing can be conducted.The research results can promote the industrialization process of supercritical CO2 fracturing. | Haizhu WANG Gensheng LI Bin ZHU Kamy SEPEHRNOORI Lujie SHI Yong ZHENG Xiaomei SHI | 2019 | Frontiers in Energy2019，13，4： | 2 |
| 13 | Intelligent Drilling and Completion:A Review显示文摘The application of artificial intelligence(AI)has become inevitable in the petroleum industry.In drilling and completion engineering,AI is regarded as a transformative technology that can lower costs and significantly improve drilling efficiency(DE),In recent years,numerous studies have focused on intelligent algorithms and their application.Advanced technologies,such as digital twins and physics-guided neural networks,are expected to play roles in drilling and completion engineering.However,many challenges remain to be addressed,such as the automatic processing of multi-source and multi-scale data.Additionally,in intelligent drilling and completion,methods for the fusion of data-driven and physicsbased models,few-sample learning,uncertainty modeling,and the interpretability and transferability of intelligent algorithms are research frontiers.Based on intelligent application scenarios,this study comprehensively reviews the research status of intelligent drilling and completion and discusses key research areas in the future.This study aims to enhance the berthing of AI techniques in drilling and completion engineering. | Gensheng Li Xianzhi Song Shouceng Tian Zhaopeng Zhu | 2022 | Engineering2022，，11： | 2 |
| 14 | Better compliance contributes to better nocturnal continence with orthotopic ileal neobladder than ileocolonic neobladder after radical cystectomy for bladder cancer显示文摘 | Zhiwen Chen Gensheng Lu Xin Li | 2009 | J Urol2009，73，1： | 1 |
| 15 | Properties and testing of a hydraulic pulse jet and its application in offshore drilling显示文摘Offshore drilling has attracted more attention than ever before due to the increasing worldwide energy demand especially in China. High cost, long drilling cycles, and low rate of penetration(ROP) represent critical challenges for offshore drilling operations. The hydraulic pulse generator was specifically designed, based on China offshore drilling technologies and parameters, to overcome problems encountered during offshore drilling. Both laboratory and field tests were conducted to collect the characteristics of the hydraulic pulse generator. The relationships between flow rate and pressure amplitude, pressure loss and pulse frequency were obtained, which can be used to optimize operation parameters for hydraulic pulse jet drilling. Meanwhile a bottom hole assembly(BHA) for pulse jet drilling has been designed, combining the hydraulic pulse generator with the conventional BHA, positive displacement motor, and rotary steerable system(RSS) etc. Furthermore, the hydraulic pulse jet technique has been successfully applied in more than 10 offshore wells in China. The depth of the applied wells ranged from 2,000 m to 4,100 m with drilling bit diameters of 311 mm and 216 mm. The field application results showed that hydraulic pulse jet technique was feasible for various bit types and formations, and that ROP could be significantly increased, by more than 25%. | Shi Huaizhong Li Gensheng Huang Zhongwei Shi Shuaishuai | 2014 | Petroleum Science2014，11，3： | 1 |
| 16 | The boosting mechanism and effects in cavity during hydrajet fracturing process显示文摘 | Qu Hai Li Gensheng Huang Zhongwei | 2010 | Petroleum Science and Technology2010，28，13： | 1 |
| 17 | Abrasive water jet perforation: an alternative approach to enhance oil production 显示文摘 | Li Gensheng Niu Jilei Song Jian | 2004 | Petroleum Science and Technology2004，22，56： | 1 |
| 18 | Study of Effectof Hydraulic Perforating on Form Ation Fracturing Pressure 显示文摘 | Li Gensheng Liu Li Huang Zhongwei | 2006 | Journal of China University of Petroleum (Edition of NaturalScience)2006，30，5： | 1 |
| 19 | Investi- gation and application for multistage hydrajet-fracturing with coiled tubing显示文摘 | Tian Shouceng Li Gensheng Huang Zhongwei | 2009 | Petroleum Science and Technology2009，27，13： | 1 |
| 20 | Surface experi- ment of abrasive water jet perforation显示文摘 | Huang Zhongwei Niu J ilei Li Gensheng | 2008 | Petroleum Science and Technology2008，26，6： | 1 |
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