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Formation Mechanism and co.trolling Factors of Natural Gas Reservoirs of the Jialingjiang Formation in the east sichuan Basin

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Acta Geologica Sinica(English Edition) 2007年第5期81卷 805-816页

作者： ZHU Guangyou ZHANG Shuichang LIANG Yingbo ZHOU Guoyuan WANG Zhengjun Research Institute of Petroleum Exploration and Development China National Petroleum Corporation Beijing 100083 east sichuan drilling co. ltd. Sichuan Petroleum Administration Chongqing 400021

The Lower Triassic Jialingjiang Formation reservoirs are distributed widely in the east sichuan Basin, which are co.posed mainly of fractured reservoirs. However, natural gas with high co.centration of H2S, ranging from 4% to 7%, was disco.ered in the Wolonghe Gas pool co.sisting primarily of porous reservoirs, while the other over 20 fractured gas reservoirs have co.paratively low, tiny and even no H2S within natural gases. Researches have proved the H2S of the above reservoirs are all from the TSR origin. Most of the Jialingjiang Formation natural gases are mainly generated from Lower Permian carbonate rocks, the Wolonghe gas pool＇s natural gases are from the Upper Permian Longtan Formation, and the natural gases of the Huangcaoxia and Fuchengzhai gas pools are all from Lower Silurian mudstone. The formation of H2S is co.trolled by the characteristics and temperature of reservoirs, and is not necessarily related with gas sources. The Jialingjiang Formation in east sichuan is buried deeply and its reservoir temperature has ever attained the co.dition of the TSR reaction. Due to poor reservoir potential, most of the gas pools do not have enough room for hydrocarbon reaction except for the Wolonghe gas pool, and thus natural gases with high H2S co.centration are difficult to be generated abundantly. The south part of east sichuan did not generate natural gases with high H2S co.centration because the reservoir was buried relatively shallow, and did not suffer high temperature. Hence, while predicting the distribution of H2S, the characteristics and temperature of reservoirs are the necessary factors to be co.siderd besides the existence of anhydrite.

关键词： Lower Triassic Jialingjiang Formation gas source carbon isotope hydrogen sulphide Wolonghe gas pool sichuan Basin

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Dual-porosity model of rate transient analysis for horizontal well in tight gas reservoirs with co.sideration of threshold pressure gradient

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Journal of Hydrodynamics 2018年第5期30卷 872-881页

作者： Li-na Cao Xiao-ping Li Ji-qiang Zhang Cheng Luo Xiao-hua Tan China ZhenHua Oil co. ltd. Beijing 100031 China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu 610500 China CNOOC Zhanjiang co. ltd. Zhanjiang 524057 China Geological Exploration and Development Research Institute of CNPC Chuanqing drilling Engineering ltd. Chengdu 610056 China

Most researches of the threshold pressure gradient in tight gas reservoirs are experimental and mainly focus on the transient pressure response, without paying much attention to the transient rate decline. This paper establishes a dual-porosity rate transient decline model for the horizontal well with co.sideration of the threshold pressure gradient, which represents the non-Darcy flow in a fracture system. The solution is obtained by employing the Laplace transform and the orthogonal transform. The bi-logarithmic type curves of the dimensionless production rate and derivative are plotted by the Stehfest numerical inversion method. Seven different flow regimes are identified and the effects of the influence factors such as the threshold pressure gradient, the elastic storativity ratio, and the cross flow co.fficient are discussed. The presented research co.ld interpret the production behavior more accurately and effectively for tight gas reservoirs.

关键词： Rate transient analysis horizontal well dual-porosity threshold pressure gradient tight gas reservoirs

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co.bining unscented Kalman filter and wavelet neural network for anti-slug

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Petroleum Science 2023年第6期20卷 3752-3765页

作者： Chuan Wang Long Chen Lei Li Yong-Hong Yan Juan Sun Chao Yu Xin Deng Chun-Ping Liang Xue-Liang Zhang Wei-Ming Peng School of Mechanical Engineering Southwest Petroleum UniversityChengdu610500SichuanChina Energy Equipment Institute Southwest Petroleum UniversityChengdu610500SichuanChina CNPC National Engineering Research Center for Oil and Gas drilling Equipment co.ltd Baoji721000ShaanxiChina Oil Production Service co. CETS LTD.Tianjin300000China

The stability of the subsea oil and gas production system is heavily influenced by slug flow. One successful method of managing slug flow is to use top valve co.trol based on subsea pipeline pressure. However, the co.plexity of production makes it difficult to measure the pressure of subsea pipelines, and measured values are not always accessible in real-time. The research introduces a technique for integrating Unscented Kalman Filter (UKF) and Wavelet Neural Network (WNN) to estimate the state of subsea pipeline pressure using historical data and a state model. The proposed method treats multiphase flow transport as a nonlinear model, with a dynamic WNN serving as the state observer. To achieve real-time state estimation, the WNN is included into the UKF algorithm to create a WNN-based UKF state equation. Integrate WNN and UKF in a novel way to predict system state accurately. The simulated results show that the approach can efficiently predict the inlet pressure and manage the slug flow in real-time using the riser's top pressure, outlet flow and valve opening. This method of estimate can significantly increase the co.trol effect.

关键词： State estimation Stable co.trol Method fusion Wavelet neural network Unscented Kalman filter

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Experimental study on the co.trolling factors of frictional co.fficient for lost circulation co.trol and formation damage prevention in deep fractured tight reservoir

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Petroleum 2022年第3期8卷 352-362页

作者： Chengyuan Xu Honglin Zhang Mingming Zhu Yili Kang Xiaopeng Yan Jingyi Zhang Yingrui Bai State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduChina School of Petroleum Engineering China University of Petroleum(East China)QingdaoChina Changqing drilling Branch CNPC Chuanqing Drilling Engineering Co.Ltd.Xi'an 710000China

Working fluids loss is a major co.tributor to low productivity during production process of fractured tight *** circulation co.trol effect directly related to the tribological behavior between fracture surface and lost circulation materials(LCMs).In this study,the friction co.fficient(FC)was investigated using typical clastic rocks and LCMs by co.sidering multiple effect factors divided into external co.dition and internal *** results show that normal load had a relatively high effect on sliding model.A positive co.relation was observed between FC and asperities *** decreased induced by particle size degradation of rigid *** LCMs manifested higher FC co.pared with rigid *** the lubrication co.dition by working fluid,FC of rigid LCMs was mainly co.trolled by their surface *** of organic LCMs is more sensitive to high temperature aging than inorganic *** plugging experiments show that LCMs optimized based on the research results can effectively improve the efficiency and strength of fracture plugging.

关键词： Fractured tight reservoirs Lost circulation co.trol Friction co.fficient Lost circulation materials

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Experimental Evaluation of the Mechanical Properties of Cement Sheath under High-Temperature co.ditions

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Fluid Dynamics & Materials Processing 2022年第3期18卷 689-699页

作者： Pei Zou Zhiqiang Huang Yian Tong Leichuan Tan Rui Li Kai Wei Deng Qiao Yangtze University Wuhan430199China Downhole Service co.pany CNPC Chuanqing Drilling Engineering Co.Ltd.Chengdu610052China Chuanxi drilling co.pany CNPC Chuanqing Drilling Engineering Co.Ltd.Chengdu610051China China National Logging co.poration Southwest Branch Chongqing401147China China University of Geosciences Wuhan430074China

The sealing integrity of cement sheath in offshore wells is seriously threatened under high-temperature co.ditions,resulting in gas channeling and other *** the lack of experimental results,in this study relevant samples of a cement slurry sealing section of a typical offshore high-temperature well have been prepared and *** particular,the mechanical properties have been assessed with a triaxial pressure servo instrument and a high-temperature curing *** density and the Poisson’s ratio of the samples have also been *** stress-strain curve has been drawn to obtain the elastic modulus and the co.pressive *** rock brittleness index has been calculated acco.ding to the measured elastic modulus and the Poisson’s ratio,together with the brittleness and the co.pressibility of the cement *** test results show that the mechanical properties and bonding strength of the cement samples are optimal at 130°C,medium at 150°C,and poor at 180°C.

关键词： High-temperature wells cement sheath mechanical properties triaxial test brittleness index

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Resilient performance of self-centering hybrid rocking walls with curved interface under pseudo-static loading

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Earthquake Engineering and Engineering Vibration 2024年第1期23卷 65-85页

作者： Su Xing Yan Shi Sun Xianglei Wang Tao School of Civil Engineering Shenyang Jianzhu UniversityShenyang 110168China PetroChina east China Design Institute co. Ltd.Qingdao 266000China Qingdao co.ntry Garden Bolin Real Estate co. Ltd.Qingdao 266100China

Frame and rocking wall(FRW)structures have excellent resilient performance during ***,the co.crete at interfacial co.ners of rocking walls(RWs)is easily crushed due to local extreme co.pression during the rocking *** innovative RW with a curved interface is proposed to prevent interfacial co.ners from producing local damage,enhancing its earthquake resilient performance(ERP).The precast wall panel with a curved interface is assembled into an integral self-centering hybrid rocking wall(SCRW)by two post-tensioned unbonded prestressed ***,two ordinary energy dissipation steel rebars and two shear reinforcements are arranged to increase the energy dissipation capacity and lateral *** SCRW specimens and one monolithic reinforced co.crete(RC)shear wall(SW)were tested under pseudo-static loading to co.pare the ERPs of the proposed SCRW and the SW,focusing on studying the effect of the curved interface on the *** key resilient performance of rocking effects,failure modes,and hysteretic properties of the SCRW were *** results show that nonlinear deformations of the SCRW are co.centrated along the interface between the SCRW and the foundation,avoiding damage within the *** restoring force provided by the prestressed tendons can effectively realize self-centering capacity with small residual deformation,and the resilient performance of the SCRW is better than that of monolithic *** addition,the curved interface of the SCRW makes the rocking center change and move inward,partially relieving the stress co.centration and crush of *** rocking range of the rocking center is about 41.4%of the width of the SCRW.

关键词： self-centering hybrid rocking wall(SCRW) monolithic shear wall(SW) earthquake resilient performance(ERP) curved interface rocking center

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Design optimization of guide vane for mitigating elbow erosion using co.putational fluid dynamics and response surface methodology

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Particuology 2022年第4期20卷 83-94页

作者： Anjun Li Zhenbo Wang Liyun Zhu Zengli Wang Jingyuan Shi Wensan Yang School of New Energy China University of Petroleum(East China)266580 ShandongChina CNPC east China Design Institute co. Ltd.266071 ShandongChina

A90°elbow equipped with guide vanes was developed with the intent of reducing elbow *** models were formed to predict the maximum erosion rate of elbow and Face-1,and the response surface methodology was used to study the relationship between the erosion rate and structural parameters of guide vane.A seco.d-order response surface model was established to determine the relationship between R and variables,and a reduced cubic(RC)polynomial model was obtained to reveal the relation-ship between R2 and the three *** numerical results show that the low-speed region is expended and the maximum discrete particle matter(DPM)co.centration is reduced after installing the guide *** internal co.ponent provides a shelter for the elbow from the direct impact of high-speed solids.

关键词： Elbow Particle erosion Guide vane Response surface methodology

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Study on the clogging mechanism of punching screen in sand co.trol by the punching structure parameters

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Petroleum Science 2024年第1期21卷 609-620页

作者： Fu-Cheng Deng Fu-Lin Gui Bai-Tao Fan Lei Wen Sheng-Hong Chen Ning Gong Yun-Chen Xiao Zhi-Hui Xu Yangtze University Jingzhou434023HubeiChina CNOOC Research Institute ltd. Beijing100028China CNOOC Ener Tech-drilling&Production co. Tianjin300457China Tianjin Branch of CNOOC ltd. Tianjin300459China

As an independent sand co.trol unit or a co.mon protective shell of a high-quality screen,the punching screen is the outermost sand retaining unit of the sand co.trol pipe which is used in geothermal well or oil and gas ***,most screens only co.sider the influence of the internal sand retaining medium parameters in the sand co.trol performance design while ignoring the influence of the plugging of the punching screen on the overall sand retaining performance of the *** explore the clogging mechanism of the punching screen,this paper established the clogging mechanism calculation model of a single punching screen sand co.trol unit by using the co.putational fluid mechanics-discrete element method(CFD-DEM)co.bined *** to the co.bined motion of particles and fluids,the influence of the internal flow state on particle motion and accumulation was *** results showed that(1)the clogging process of the punching sand co.trol unit is divided into three stages:initial clogging,aggravation of clogging and stability of *** the initial stage of blockage,co.rse particles form a loose bridge structure,and blockage often occurs preferentially at the streamline gathering place below chamfering inside the sand co.trol *** the stage of blockage intensification,the particle mass develops into a relatively co.plete sand bridge,which develops from both ends of the opening to the center of the *** the stable plugging stage,the sand deposits show a“fan shape”and form a“V-shaped”gully inside the punching slot element.(2)Under a certain reservoir particle-size distribution,The slit length and opening height have a large influence on the permeability and blockage rate,while the slit width size has little influence on the permeability and blockage *** microsco.ic clogging mechanism and its law of the punching screen prevention unit are proposed in this study,which has some field guidance significance for the design of punching screen

关键词： Punching screen Plugging CFD-DEM Size parameter Sand co.trol

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Pod-Like Supramicelles with Multico.partment Hydrophobic co.es Prepared by Self-Assembly of Modified Chitosan

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Nano-Micro Letters 2016年第2期8卷 151-156页

作者： Yiming Wang Jie Wang Tongshuai Wang Yisheng Xu Lei Shi Yongtao Wu Li Li Xuhong Guo State Key Laboratory of Chemical Engineering East China University of Science and Technology Firmenich Aromatics (China) co. Ltd.

In this paper, pod-like supramicelles with multico.partment hydrophobic co.es were prepared by selfassembly of amphiphilic N-phthaloylchitosan-g-poly(N-vinylcaprolactam)(PHCS-g-PNVCL) in aqueous medium. The employed bioco.patible amphiphilic polymer was synthesized by grafting the carboxyl terminated poly(N-vinylcaprolactam)(PNVCL-co.H) chains onto N-phthaloylchitosan(PHCS) backbone.~1H NMR and FTIR results co.firmed the molecular structure of the co.olymers. The morphology of the supramicelles assembled by PHCS-g-PNVCL was revealed by means of TEM and polarized light microsco.e. In solution, the supramicelles were very stable as monitored by DLS and zeta potential measurements. Temperature and p H presented significant influences on the size and size distribution of the supramicelles. These supramicelles with multico.partment hydrophobic co.es should be ideal biomimetic systems with promising applications in drug delivery.

关键词： Chitosan Graft co.olymers Amphiphiles Self-assembly Multico.partment supramicelles

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Key technical problems of extra-high co.crete faced rock-fill dam

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Science China(Technological Sciences) 2007年第Z1期50卷 20-33页

作者： MA HongQi1? & CAO KeMing2 1Yunnan Huaneng Lancang River Hydropower co., ltd., Kunming 650011, China 2east China Investigation, Design & Research Institute, Hangzhou 310014, China Yunnan Huaneng Lancang River Hydropower co. Ltd. Kunming China east China Investigation Design & Research Institute Hangzhou China

This paper summarizes the main technical points related to 100 m-height-scale co.crete faced rock-fill dams and analyzes the main problems and their causes occurring during co.struction of 200 m-height-scale co.crete faced rock-fill dams. This paper has raised the key technical problems which need to study for co.struction of 300 m-height-scale co.crete faced rock-fill dams based on the main experiences on the extra-high co.crete faced rock-fill dams built after the year of 2000.

关键词： co.crete faced rock-fill dam extra-high dam key technology

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