Prediction of reservoir saturation field in high water cut stage by bore-ground electromagnetic method based on machine learning

2021 ◽  
pp. 108678
Author(s):  
Guo Qi ◽  
Zhuang Tianlin ◽  
Li Zhen ◽  
He Shumei
Keyword(s):  
Machine Learning ◽  
High Water ◽  
Electromagnetic Method ◽  
Saturation Field ◽  
High Water Cut Stage ◽  
High Water Cut ◽  
Water Cut

scholarly journals The research on the classification method of high water-cut well group in Y block

2020 ◽  
Vol 194 ◽  
pp. 01024
Author(s):  
Yu Xiaoyuan
Keyword(s):  
Water Content ◽  
High Water ◽  
High Water Content ◽  
Saturation Field ◽  
Oil Saturation ◽  
Remaining Oil ◽  
High Water Cut Stage ◽  
High Water Cut ◽  
Water Cut ◽  
Seepage Channel

Y block has entered the ultra-high water cut stage of production, and the water cut of oil wells is generally higher than 90%. Before polymer flooding, water cut continues to rise. High-water-bearing wells in the injected area are characterized by difficulty in effectiveness and low water cut decline, which seriously affects the overall development effect of the area. In this paper, the high water-bearing wells are divided into four categories by the parameter index of the number of layers in the high water-bearing channels before polymer flooding.Through the splitstream curve and the phase permeability curve, the permeability and oil saturation data under the condition of 98% water content were selected for fitting, and the critical oil saturation formula was obtained.The ratio between the oil saturation and the critical oil saturation is calculated by numerical simulation, and the discriminant standard of the dominant seepage channel with high water content is established.Compared with previous remaining oil saturation field identification methods, changed the method according to the conventional ideas of remaining oil saturation evaluation of water and residual oil, through the analysis of reservoir permeability parameters for the current development under the condition of the target reservoir quantitative identification of the cause of high water cut, to cause high containing water wells and reservoir high water cut oilfield management work provide quantitative analysis and objective guidance.

scholarly journals Study on oil displacement efficiency of offshore sandstone reservoir with big bottom water

2021 ◽  
Author(s):  
Jie Tan ◽  
Ying-xian Liu ◽  
Yan-lai Li ◽  
Chun-yan Liu ◽  
Song-ru Mou
Keyword(s):  
Bottom Water ◽  
High Water ◽  
Displacement Efficiency ◽  
Oil Displacement ◽  
Oil Displacement Efficiency ◽  
Sandstone Reservoir ◽  
Sandstone Reservoirs ◽  
High Water Cut Stage ◽  
High Water Cut ◽  
Water Cut

AbstractX oilfield is a typical sandstone reservoir with big bottom water in the Bohai Sea. The viscosity of crude oil ranges from 30 to 425 cp. Single sand development with the horizontal well is adopted. At present, the water content is as high as 96%. The water cut of the production well is stable for a long time in the high water cut period. The recoverable reserves calculated by conventional methods have gradually increased, and even the partial recovery has exceeded the predicted recovery rate. This study carried out an oil displacement efficiency experiment under big water drive multiple to accurately understand an extensive bottom water reservoir's production law in an ultra-high water cut stage. It comprehensively used the scanning electron microscope date, casting thin section, oil displacement experiment, and production performance to analyze the change law of physical properties and relative permeability curve from the aspects of reservoir clay minerals, median particle size, pore distribution, and pore throat characteristics. Therefore, the development law of horizontal production wells in sandstone reservoirs with big bottom water is understood. It evaluates the ultimate recovery of sandstone reservoirs with big bottom water. It provides a fundamental theoretical basis and guidance for dynamic prediction and delicate potential tapping of sandstone reservoirs with big bottom water at a high water cut stage.

scholarly journals New prediction method for transient productivity of fractured five-spot patterns in low permeability reservoirs at high water cut stages

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 499-508
Author(s):  
Chuanzhi Cui ◽  
Zhongwei Wu ◽  
Zhen Wang ◽  
Jingwei Yang ◽  
Yingfei Sui
Keyword(s):  
Prediction Method ◽  
Mass Conservation ◽  
High Water ◽  
Low Permeability ◽  
Element Analysis ◽  
Fracture Length ◽  
High Water Cut Stage ◽  
High Water Cut ◽  
Water Cut ◽  
Low Permeability Reservoirs

AbstractPredicting the productivity of fractured five-spot patterns in low permeability reservoirs at high water cut stages has an important significance for the development and optimization of reservoirs. Taking the reservoir heterogeneity and uneven distribution of the remaining oil into consideration, a novel method for predicting the transient productivity of fractured five-spot patterns in low permeability reservoirs at high water cut stages is proposed by using element analysis, the flow tube integration method, and the mass conservation principle. This new method is validated by comparing with actual production data from the field and the results of a numerical simulation. Also, the effects of related parameters on transient productivity are analyzed. The results show that increasing fracture length, pressure difference and reservoir permeability correspond to an increasing productivity. The research provides theoretical support for the development and optimization of fractured five-spot patterns at the high water cut stage.

Layer regrouping optimization for multilayer heterogeneous reservoirs at a high water cut stage

2019 ◽  
Vol 12 (15) ◽  
Author(s):  
Wu Zhongwei ◽  
Cui Chuanzhi ◽  
Japan Trivedi ◽  
Li Rongtao ◽  
Tang Wenhao ◽  
...  
Keyword(s):  
High Water ◽  
Heterogeneous Reservoirs ◽  
High Water Cut Stage ◽  
High Water Cut ◽  
Water Cut

scholarly journals New Waterflooding Characteristic Curves Based on Cumulative Water Injection

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Zhiwang Yuan ◽  
Zhiping Li ◽  
Li Yang ◽  
Yingchun Zhang
Keyword(s):  
Characteristic Curve ◽  
Water Injection ◽  
Material Balance ◽  
Oil Production ◽  
High Water ◽  
Difficult Problem ◽  
Prediction Errors ◽  
High Water Cut Stage ◽  
High Water Cut ◽  
Water Cut

When a conventional waterflooding characteristic curve (WFCC) is used to predict cumulative oil production at a certain stage, the curve depends on the predicted water cut at the predicted cutoff point, but forecasting the water cut is very difficult. For the reservoirs whose pressure is maintained by water injection, based on the water-oil phase seepage theory and the principle of material balance, the equations relating the cumulative oil production and cumulative water injection at the moderately high water cut stage and the ultrahigh water cut stage are derived and termed the Yuan-A and Yuan-B curves, respectively. And then, we theoretically analyze the causes of the prediction errors of cumulative oil production by the Yuan-A curve and give suggestions. In addition, at the ultrahigh water cut stage, the Yuan-B water cut prediction formula is established, which can predict the water cut according to the cumulative water injection and solve the difficult problem of water cut prediction. The application results show Yuan-A and Yuan-B curves are applied to forecast oil production based on cumulative water injection data obtained by the balance of injection and production, avoiding reliance on the water cut forecast and solving the problems of predicting the cumulative oil production of producers or reservoirs that have not yet shown the decline rule. Furthermore, the formulas are simple and convenient, providing certain guiding significance for the prediction of cumulative oil production and water cut for the same reservoir types.

Sign in / Sign up

Export Citation Format

Share Document