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Study on Optimal water ControlMethods for Horizontal Wells in bottom water Clastic Rock Reservoirs

Fluid Dynamics & Materials Processing 2024年第10期20卷 2377-2392页

作者： Xianghua Liu Hai Song Lu Zhao Yan Zheng Neng Yang Dongling Qiu Sinopec Northwest Oilfield Branch Northwest Oilfield Branch of China Petroleum and Chemical CorporationUrumqi830011China School of Petroleum and Natural Gas Engineering Southwest Petroleum UniversityChengdu610500China

The segmented water control technology for bottom water reservoirs can effectively delay the entry of bottom water and adjust the production *** clarify the impact of different methods on horizontal well production with different reservoir conditions and to provide theoretical support for the scientific selection of methods for bottom water reservoirs,a numerical simulation method is presented in this study,which is able to deal with wellbore reservoir coupling under screen tube,perforation,and ICD(Inflow Control Device)*** the geological characteristics of the bottom-water conglomerate reservoir in the Triassic Formation of the Tahe Block 9 as a test case,the three aforementioned completion methods are tested to predict the transient production *** impact of completion parameters,reservoir permeability,bottom-water energy,and individual well control on the time to encounter water in horizontal wells(during a water-free production period)is discussed.A boundary chart for the selection of completion methods is introduced *** results show that the optimized ICD completion development effect for heterogeneous reservoirs is the best,followed by optimized perforation *** is the main factor affecting the performances of completion methods,while bottom water energy and single well controlled reserves have a scarce *** average permeability of the reservoir is less than 500 mD,and ICD has the best water control *** the permeability is greater than 500 mD,the water control effect of perforation completion becomes a better option.

关键词： Completion method bottom water low-permeability oil reservoir horizontal well development effect

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Progress and prospects of EOR technology in deep,massive sandstone reservoirs with a strong bottom-water drive

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Energy Geoscience 2024年第1期5卷 249-255页

作者： Haiying Liao Ting Xu Hongmin Yu SINOPEC Exploration&Production Research Institute Beijing100083China

The Triassic massive sandstone reservoir in the Tahe oilfield has a strong bottom-water drive and is characterized by great burial depth,high temperature and salinity,a thin pay zone,and strong *** present,the water-cut is high in each block within the reservoir;some wells are at an ultrahigh water-cut stage.A lack of effective measures to control water-cut rise and stabilize oil production have necessitated the application of enhanced oil recovery(EOR)*** paper investigates the development and technological advances for oil reservoirs with strong edge/bottom-water drive globally,and compares their application to reservoirs with characteristics similar to the Tahe *** the technological advances,gas injection from the top and along the direction of structural dip has been used to optimize the flow field in a typical bottom-water drive ***-water coning is restrained by gas injection-assisted water *** addition,increasing the lateral driving pressure differential improves the plane sweep efficiency which enhances oil recovery in *** injection technology in combination with technological measures like channeling prevention and blocking,and water plugging and profile control,can achieve better results in reservoir *** flooding tests in the Tahe oilfield are of great significance to identifying which EOR technology is the most effective and has the potential of large-scale application for improving development of deep reservoirs with a strong bottomwater drive.

关键词： Edge water bottom water water coning Massive reservoir water injection Gas injection

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Evaluation of Early High Speed Development of bottom water Heavy Oil Reservoir

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Journal of Geoscience and Environment Protection 2020年第11期8卷 201-208页

作者： Xiujuan Zhao Songru Mou Jie Tan Bowei Liu Enhui Sun Bohai Oilfield Research Institute of CNOOC Ltd.-Tianjin Branch Tianjin China

The bottom water heavy oil reservoir has high natural energy, and the bottom water body multiple of the reservoir is 300 times or even higher. The natural energy of the reservoir can keep the superior condition that the formation energy does not decrease under the condition of large liquid volume and high recovery rate. In view of this reservoir condition, we take C oilfield as an example to carry out the oilfield development effect under the condition of large liquid volume and high-speed production, and analyze the influence of high-speed production and medium low-speed production on recovery rate of similar heavy oil bottom water-reservoir. The results show that the rising trend of water cut in oilfield is the same whether high-speed development with large liquid volume or conventional low-speed development is adopted. Under the condition of high liquid production, the sweep efficiency of water flooding is high in the same period of time, which has certain advantages of enhanced oil recovery. The development mode of early large liquid production is explored, which provides certain guidance for the efficient development of heavy oil reservoir with bottom water.

关键词： bottom water Heavy Oil High Speed Development

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Impact of environmental variables on spatial and seasonal internal phosphorus loading in a mesoeutrophic lake

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International Journal of Sediment Research 2019年第1期34卷 14-26页

作者： Katarzyna Kowalczewska-Madura Ryszard Go?dyn Julia Bogucka Katarzyna Strzelczyk Department of water Protection Faculty of BiologyAdam Mickiewicz University

Strzeszynskie Lake was formerly a slightly eutrophic（meso-eutrophic） water body. The aim of the current research was to define variables on both spatial and seasonal internal phosphorus loading from bottom sediments at five stations located in zones varying in depth, oxygenation, macrophyte presence,and uses of the neighboring catchment area. Ex situ experiments done with the use of intact bottom sediment cores have shown that the highest phosphorus release occurred in the deepest part of the lake and reached 3.6 mg P/m2d under anoxic conditions during summer thermal stratification. In turn, the internal loading from littoral sediments, which were well aerated all year round, was clearly ***, phosphorus accumulation in the bottom sediment was observed to reach a maximum of 1.45 mg P/m2d in autumn. A comparison of the internal loading intensity in lake zones with different land uses of the neighboring catchment area has shown slightly higher values at stations adjacent to the forest catchment area than those used for recreation. Changes in the land use of the catchment area of Strzeszynskie Lake, especially the increase in impermeable surfaces, have led to an increased inflow of external loads after heavy rains, resulting in deterioration in water quality and a delayed increase in internal loading.

关键词： bottom sediments Interstitial water bottom water Internal loading Sediment-water interface

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