scholarly journals Water Breakthrough Shape Description of Horizontal Wells in Bottom-Water Reservoir

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Shijun Huang ◽  
Baoquan Zeng ◽  
Fenglan Zhao ◽  
Linsong Cheng ◽  
Baojian Du
Keyword(s):  
Physical Model ◽  
Horizontal Well ◽  
Bottom Water ◽  
Water Reservoir ◽  
Horizontal Wells ◽  
Analysis Model ◽  
Heterogeneous Reservoir ◽  
Water Breakthrough ◽  
Original Oil In Place ◽  
Water Cut

Horizontal wells have been applied in bottom-water reservoir since their advantages were found on distribution of linear dropdown near wellbore, higher critical production, and more OOIP (original oil in place) controlled. In the paper, one 3D visible physical model of horizontal physical model is designed and built to simulate the water cresting process during the horizontal well producing and find water breakthrough point in homogenous and heterogeneous reservoir with bottom water. Water cresting shape and water cut of horizontal well in between homogenous and heterogeneous reservoir are compared on the base of experiment’s result. The water cresting pattern of horizontal well in homogeneous reservoir can be summarized as “central breakthrough, lateral expansion, thorough flooding, and then flank uplifting.” Furthermore, a simple analysis model of horizontal well in bottom water reservoir is established and water breakthrough point is analyzed. It can be drawn from the analysis result that whether or not to consider the top and bottom border, breakthrough would be located in the middle of horizontal segment with equal flow velocity distribution.

scholarly journals Productivity evaluation of horizontal well in heterogeneous reservoir with composite water aquifer

2021 ◽  
Vol 11 (3) ◽  
pp. 1363-1373
Author(s):  
Hui Yuan ◽  
Wenhong Li ◽  
Yingzhong Yuan ◽  
Jiao Luo ◽  
Wende Yan
Keyword(s):  
Horizontal Well ◽  
Bottom Water ◽  
Superposition Principle ◽  
Research Result ◽  
Water Reservoir ◽  
Water Contact ◽  
Heterogeneous Reservoir ◽  
Oil Water ◽  
Productivity Prediction ◽  
Thin Reservoir

AbstractHorizontal well is an important way to develop thin reservoir with edge-bottom water aquifer. For the horizontal well near oil–water contact, the reservoir have the features of edge water and bottom water at the same time. The productivity formula of horizontal well in pure edge water or pure bottom water reservoir is not fully applicable to this type of reservoir. For the heterogeneous reservoir with composite water aquifer, the horizontal well is divided into multiple well sections by using the concept of multi-segment well. Based on the seepage mechanics theory and potential superposition principle, considering the mutual interference between multi well sections, the productivity formula of horizontal well in heterogeneous reservoir with composite water aquifer is established. The new productivity formula considers the effect of reservoir heterogeneity, the quasi-linear flow of lateral edge water and the ellipsoidal flow of vertical bottom water. It can effectively determine the influence range and drainage distance of edge water in a heterogeneous reservoir with composite water aquifer. According to the test data of horizontal wells in Weizhou 11-1 oilfield, the drainage distance b of edge water is fitted and used to predict the productivity of new wells, and the result is very good. The research result lays a foundation for productivity prediction of horizontal well in heterogeneous reservoir with composite water aquifer.

scholarly journals The Effect of Interlayer on Water Cut Rise in a Bottom Water Reservoir

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Yunpeng Hu ◽  
Xiaoling Zhang ◽  
Wei Ding ◽  
Ziyun Cheng ◽  
Liangchao Qu ◽  
...  
Keyword(s):  
Bottom Water ◽  
Water Reservoir ◽  
Inhibitory Effect ◽  
Upper Body ◽  
Two Phase ◽  
Control Laws ◽  
Water Breakthrough ◽  
Short Period ◽  
Water Cut ◽  
The Impact

A bottom water reservoir is universal in all reservoirs in the world. In the exploitation process of the bottom water reservoir, because the reservoir is in complete contact with bottom water, the natural energy supply of the bottom water reservoir is sufficient. At the same time, in the production process, the pressure drop generated by the formation is mainly concentrated near the wellbore, which leads to a short period of waterless oil production, fast water breakthrough, and fast water cut rise, which seriously affects the overall recovery factor and increases the risk of oil filed exploitation. Since the distribution of an interlayer enhances the heterogeneity of the reservoir, it has a prominent impact on the flow of oil and water in the bottom water reservoir. However, people know little about the impact of the interlayer on the bottom water reservoir. In this paper, the mathematical model of two-phase flow in the bottom water reservoir with the interlayer is proposed, and the numerical solution of the model is obtained by a finite element method. The influence of the distribution of the interlayer on the water cut rising law of the bottom water reservoir is analyzed. The results show that the bottom water is blocked by the interlayer and its own gravity and the rising height of the bottom water is limited, so that the interlayer has a significant inhibitory effect on the coning of the bottom water. The closer the interlayer is to the oil-water interface, the faster the water cut will rise; the narrower the interlayer is, the faster the bottom water ridge will advance; when the width of the interlayer is the same as that of the reservoir, the water cone will not appear; the higher the permeability of the interlayer is, the faster the upper body of the water cut will be; when the permeability of the reservoir and the interlayer is over 1000, the influence of the interlayer on the water cut rise is not obvious; the thickness of the interlayer on the water cut rise law has little effect. Finally, through the case analysis, it is proposed that the new horizontal wells should be arranged in the position where the interlayer develops. The findings of this study can help for the better understanding of control laws of the interlayer on the bottom water and providing a crucial theoretical basis for the development of the bottom water reservoir.

The Research for Delaying the Bottom Water Coning in Horizontal Wells Application Balance Screen Pipe

2013 ◽  
Vol 734-737 ◽  
pp. 1480-1483 ◽  
Author(s):  
Wu Yi Shan ◽  
Xue Zhang
Keyword(s):  
Pressure Distribution ◽  
Oil Recovery ◽  
Horizontal Well ◽  
Bottom Water ◽  
Horizontal Wells ◽  
Optimization Method ◽  
Well Water ◽  
Horizontal Section ◽  
Water Breakthrough ◽  
Water Coning

When horizontal wells are used to exploit reservoir with bottom water, oil wells water breakthrough prematurely due to water coning, water-free oil recovery is reduced. The reason of the formation of horizontal well water cone is analyzed. Then analysis of the mechanism using balanced screen pipe to inhibit bottom water coning in horizontal well is completed. According to the existing screen pipe size, screen configuration is optimized. Horizontal section pressure distribution is controlled by the balanced screen pipe, and then flow of horizontal well sections is adjusted. Bottom water coning speed of all well sections is controlled. An example is calculated by the software which established and the result shows that optimization method can improve water-free oil recovery.

Systematic Evaluation on Horizontal well Performance in Bottom Water Reservoir

2013 ◽  
Vol 411-414 ◽  
pp. 3129-3133 ◽  
Author(s):  
Yun Ting Li ◽  
Yue Dong Yao ◽  
Tao Peng ◽  
Dan Sang ◽  
Xiang Chun Wang
Keyword(s):  
Oil Recovery ◽  
Horizontal Well ◽  
Bottom Water ◽  
Water Reservoir ◽  
Systematic Evaluation ◽  
Research Trend ◽  
Well Performance ◽  
Key Factors ◽  
Water Breakthrough ◽  
Calculation Results

Development of bottom water reservoir with horizontal well can effectively slow down water coning and avoid early water breakthrough in oil wells, which promotes the extensive application of horizontal well in bottom water reservoir. In this paper, literatures about horizontal well are investigated, and the latest research trend is summarized. All factors such as reservoirs, fluid property and production mode to influence horizontal well performance in bottom water reservoir are systematically studied by using reservoir numerical simulation. Based on the calculation results of reservoir parameters of the pilot area, comprehensive analysis to the key factors which affecting horizontal well performance is carried out and the influence degree of various factors on oil recovery is obtained. In a word, the research results in this paper can provide criteria for the design or optimization of horizontal well development in bottom water reservoir.

scholarly journals Numerical Simulation of Nitrogen Foam Injection to Control Water Cresting by Bilateral Horizontal Well in Bottom Water Reservoir

2012 ◽  
Vol 5 (1) ◽  
pp. 53-60
Author(s):  
Liu Yong-Ge ◽  
Liu Hui-Qing ◽  
Pang Zhan-Xi
Keyword(s):  
Numerical Simulation ◽  
Correlation Length ◽  
Horizontal Well ◽  
Bottom Water ◽  
Water Reservoir ◽  
Simulation Method ◽  
Geological Condition ◽  
Lower Branch ◽  
Nitrogen Foam ◽  
Water Cut

By numerical simulation, a bilateral horizontal well is placed in a crude oil reservoir with bottom water. The upper branch which is located near the top of the reservoir is for producing and the lower branch which is located near the oil water contract is for nitrogen foam injecting. Packers are used to control the alternation between productions and injections. When water cut of the upper branch reaches a certain value, this branch is shut and nitrogen foam is injected into the lower branch. After two days' soaking, the upper branch is opened to produce again. This process can be repeated for several times along with the reservoir development. The main mechanisms of this development style are analyzed, and different injecting methods including injecting foam in the lower branch (IFLB), injecting foam in the upper branch (IFUB), and injecting nitrogen gas in the lower branch (INLB) are contrasted. The effect of reservoir heterogeneity on the performance of IFLB is also considered. Various stochastic realizations with different shale contents and correlation lengths are established by sequential indicator simulation method. In order to explain the large variations occurring in the realizations with same shale content and correlation length, the definition ‘below well region’ (BWR) is put forward and two groups of models with different BWR are built to simulate the performance of IFLB. As expected, the geological condition of BWR has a great effect on the performance of IFLB. If the shale content of BWR is low, good performance can be obtained with any combination of shale content and correlation length for the remaining region. On the contrary, if shale content and continuity of BWR are high, the performance of IFLB will significantly decrease.

A Quick Evaluation Model for Horizontal Well Development in Bottom Water Reservoir

2011 ◽  
Vol 347-353 ◽  
pp. 398-402
Author(s):  
Yuan Gang Wang ◽  
Yue Dong Yao ◽  
Ming Jiang ◽  
Ze Min Ji
Keyword(s):  
Correction Factor ◽  
Oil Recovery ◽  
Horizontal Well ◽  
Bottom Water ◽  
Evaluation Model ◽  
Water Reservoir ◽  
Recoverable Reserves ◽  
Well Development ◽  
Heterogeneity Correction ◽  
Water Cut

The evaluation model for horizontal well development has significant potential in recoverable reserves uncertainty studies. This paper firstly establishes an evaluation model on the degree of reserve recovery at different level of water cut, and then makes a chart of the dimensionless aspect seepage ratio against the degree of reserve recovery at different level of water cut. Secondly, introduces heterogeneity correction factor and saturation correction factor to improve the oil recovery model. Finally, the oil recovery of 6 reservoirs with horizontal well development in Dagang Oil Company indicates that the prediction of the evaluation model is agreement with the actual data, and the model can provide criteria for horizontal well development in a bottom water reservoir.

scholarly journals Prediction of water breakthrough time in horizontal Wells in edge water condensate gas reservoirs

2020 ◽  
Vol 213 ◽  
pp. 02009
Author(s):  
Quan Hua Huang ◽  
Xing Yu Lin
Keyword(s):  
Horizontal Well ◽  
Negative Impact ◽  
Horizontal Wells ◽  
Breakthrough Time ◽  
Gas Reservoirs ◽  
Gas Reservoir ◽  
Water Breakthrough ◽  
Calculation Results ◽  
Seepage Model ◽  
Reasonable Prediction

Horizontal Wells are often used to develop condensate gas reservoirs. When there is edge water in the gas reservoir, it will have a negative impact on the production of natural gas. Therefore, reasonable prediction of its water breakthrough time is of great significance for the efficient development of condensate gas reservoirs.At present, the prediction model of water breakthrough time in horizontal Wells of condensate gas reservoir is not perfect, and there are mainly problems such as incomplete consideration of retrograde condensate pollution and inaccurate determination of horizontal well seepage model. Based on the ellipsoidal horizontal well seepage model, considering the advance of edge water to the bottom of the well and condensate oil to formation, the advance of edge water is divided into two processes. The time when the first water molecule reaches the bottom of the well when the edge water tongue enters is deduced, that is, the time of edge water breakthrough in condensate gas reservoir.The calculation results show that the relative error of water breakthrough time considering retrograde condensate pollution is less than that without consideration, with a higher accuracy. The example error is less than 2%, which can be effectively applied to the development of edge water gas reservoir.

The Horizontal Well Production Technique with Thin Bedded Bottom Water Reservoir in Luliang Oil Field

2010 ◽  
Author(s):  
Jin Huo ◽  
Guoxin Shi ◽  
Jianguo Lu ◽  
Linxiang Sang ◽  
Jun Shi ◽  
...  
Keyword(s):  
Horizontal Well ◽  
Bottom Water ◽  
Water Reservoir ◽  
Oil Field ◽  
Production Technique ◽  
Well Production
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