scholarly journals Decision-Making Techniques for Water Shutoff Using Random Forests and Its Application in High Water Cut Reservoirs

ACS Omega ◽  
2021 ◽  
Author(s):  
Khwaja Naweed Seddiqi ◽  
Hongda Hao ◽  
Huaizhu Liu ◽  
Jirui Hou
Keyword(s):  
Decision Making ◽  
Random Forests ◽  
High Water ◽  
Water Shutoff ◽  
High Water Cut ◽  
Water Cut

Pre-Warning and Decision Making of Water Breakthrough for Higher Water-Cut Oil Field

2011 ◽  
Vol 347-353 ◽  
pp. 688-693
Author(s):  
Han Qiao Jiang ◽  
Shuo Liang Wang ◽  
Yuan Zhang
Keyword(s):  
Decision Making ◽  
Early Warning ◽  
High Water ◽  
Oil Field ◽  
Warning Signs ◽  
Water Shutoff ◽  
Profile Control ◽  
Single Well ◽  
High Water Cut Stage ◽  
Water Cut

Major domestic oil fields have entered the period of high water now, however, choosing timing of profile control and water shutoff is always delay, Mostly have to wait until after the adoption of dynamic degradation. This article introduced the concept of early warning that is widely used in military and economic fields to profile control and water shut-off decision-making in high water-cut stage. Combination of actual situation of water shut-off decision-making, Presented a strong adaptive set of Warning signs of indicators, on the basis of the analysis of variation in the warning sighs of indicators, this paper proposed early warning model and processes of profile control and water shut-off. The model not only can give the current degree of a single well, but also can forecast the future degree of change in a period of time, so this modle could provide an effective basis for water shutoff and profile controle decision-makers.

Experimental Study on a New Type of Water Shutoff Agent Used in Fractured Low Permeability Reservoir

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
Lei Zhang ◽  
Chunsheng Pu ◽  
Shuxia Cui ◽  
Khan Nasir ◽  
Yang Liu
Keyword(s):  
Mathematical Model ◽  
High Water ◽  
Low Permeability ◽  
Low Permeability Reservoir ◽  
Water Shutoff ◽  
Viscous Modulus ◽  
Starch Gel ◽  
New Type ◽  
High Water Cut ◽  
Water Cut

In order to effectively plug the fracture channeling-path in the high water cut fractured low permeability reservoir, a new type of water shutoff agent is developed by bottle tests and its injectivity and plugging performance in fractures are systematically studied by rheology and fractured core displacement experiment. The gelant consists of modified starch, dimethyl diallyl ammonium chloride, N,N′-methylene diacrylamide, and potassium persulfate, which behaves as a Newtonian with a good flowing capacity that allows its accurate positioning in the fractures. After gelatinization, the gel has high elastic modulus and viscous modulus. During the gelant injection into the fractured core, the filtration from fracture into matrix of the gelant leads to a difference between the injection volume of the gelant and the plugged fracture volume. Thus, a mathematical model for calculating filtration volume is established and applied in plugging experiment very well. After plugging, the two block cores can be tightly cemented together by the starch gel. The experiments show that the water shutoff agent and the mathematical model of filtration can be used to effectively plug the fracture channeling-path in the high water cut fractured low permeability reservoir.

A Successful Application of Continuous Pack-Off Technology to Water Shutoff Recompletion for High-WCT Gravel-Packed Horizontal Well

2021 ◽  
Author(s):  
An Jiang ◽  
Yunpeng Li ◽  
Xing Liu ◽  
Fengli Zhang ◽  
Tianhui Wang ◽  
...  
Keyword(s):  
Horizontal Well ◽  
Axial Flow ◽  
High Water ◽  
Bohai Bay ◽  
Horizontal Section ◽  
Well Completion ◽  
Water Shutoff ◽  
Sand Control ◽  
High Water Cut ◽  
Water Cut

Abstract Objectives/Scope Controlling the excessive water production from the high water cut gravel packing horizontal well is a challenge. The approach which uses regular packers or packers with ICD screens to control the unwanted water does not function well. This is mainly because of the length limitation of packers which will make the axial flow resistance insufficient. Methods, Procedures, Process In this paper, a successful case that unwanted water is shutoff by using continuous pack-off particles with ICD screens (CPI) in the whole horizontal section in an offshore oilfield of Bohai bay is presented. The reservoir of this case is the bottom-water high viscosity reservoir. The process is to run 2 3/8" ICD screen string into the 4" screen string originally in place, then to pump the pack-off particles into the annulus between the two screens, and finally form the 360m tightly compacted continuous pack-off particle ring. Results, Observations, Conclusions The methodology behind the process is that the 2-3/8" ICD screens limit the flow rate into the pipes as well as the continuous pack-off particle ring together with the gravel ring outside the original 4" screens to prevent the water channeling into the oil zone along the horizontal section. This is the first time this process is applied in a high water cut gravel packed horizontal well. After the treatment, the water rate decreased from 6856BPD to 836.6BPD, the oil rate increased from 44BPD to 276.8BPD. In addition, the duration of this performance continued a half year until March 21, 2020. Novel/Additive Information The key of this technology is to control the unwanted water by using the continuous pack-off particles instead of the parkers, which will bring 5 advantages, a) higher efficiency in utilizing the production interval; b) no need to find the water source and then fix it; c) the better ability to limit the axial flow; d) effective to multi-WBT (water break though) points and potential WBT points; e) more flexible for further workover. The technology of this successful water preventing case can be reference to other similar high water cut gravel packed wells. Also, it has been proved that the well completion approach of using CPI can have good water shutoff and oil incremental result. Considering the experiences of historical applications, CPI which features good sand control, water shutoff and anti-clogging is a big progress compared to the current completion technologies.

scholarly journals Grey decision-making theory in the optimization of strata series recombination programs of high water-cut oilfields

2011 ◽  
Vol 38 (4) ◽  
pp. 463-469 ◽  
Author(s):  
Qiaoyun Li ◽  
Jiqun Zhang ◽  
Baorong Deng ◽  
Junhua Chang ◽  
Hua Li ◽  
...  
Keyword(s):  
Decision Making ◽  
High Water ◽  
High Water Cut ◽  
Water Cut

Preventing Proppant and Formation-Sand Production in High Water Cut, Heavy-Oil Wells: A Field Study from Argentina

2009 ◽  
Author(s):  
Daniel Daparo ◽  
Luis Soliz ◽  
Eduardo Roberto Perez ◽  
Carlos Iver Vidal Saravia ◽  
Philip Duke Nguyen ◽  
...  
Keyword(s):  
Field Study ◽  
Heavy Oil ◽  
High Water ◽  
Oil Wells ◽  
Sand Production ◽  
High Water Cut ◽  
Water Cut

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.

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