Study on Water Breakthrough Regularity and Influencing Factors of Horizontal Wells in a Heterogeneous Reservoir With Bottom Water

2013 ◽  
Vol 31 (8) ◽  
pp. 803-811 ◽  
Author(s):  
Q. Zheng ◽  
H. Liu ◽  
F. Li
Keyword(s):  
Influencing Factors ◽  
Bottom Water ◽  
Horizontal Wells ◽  
Heterogeneous Reservoir ◽  
Water Breakthrough

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.

A Prediction of Water Breakthrough Time of Horizontal Wells in Gas Reservoirs with Bottom Water

2011 ◽  
Vol 201-203 ◽  
pp. 393-398
Author(s):  
Wei Yao Zhu ◽  
Xiao He Huang ◽  
Hong Qing Song ◽  
Jia Deng ◽  
Xuan Liu
Keyword(s):  
Bottom Water ◽  
Water Saturation ◽  
Horizontal Wells ◽  
Breakthrough Time ◽  
Gas Reservoirs ◽  
Gas Well ◽  
Porous Flow ◽  
Water Breakthrough ◽  
Irreducible Water Saturation

Based on the theory of porous flow, a study on prediction of water breakthrough time of horizontal wells in a homogeneous gas reservoir with bottom water is presented. This paper derives water breakthrough time formula of horizontal wells in a reservoir with bottom water drive. In the formula many factors are taken into account, such as height of water avoidance, gas-water mobility ratio, irreducible water saturation, residual gas saturation, etc. Case study indicates that for a horizontal gas well with constant production rate, the water breakthrough time is proportional to the height of water avoidance.

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.

Experimental Research for Breakthrough Position of Horizontal Wells in Reservoirs with Bottom Water

2012 ◽  
Vol 524-527 ◽  
pp. 1232-1235 ◽  
Author(s):  
Li Feng Li ◽  
Xiang An Yue ◽  
Li Juan Zhang
Keyword(s):  
Pressure Drop ◽  
Bottom Water ◽  
Horizontal Wells ◽  
Concave Part ◽  
Entry Points ◽  
Heterogeneous Models ◽  
Two Factors ◽  
Well Trajectory ◽  
Trajectory Models ◽  
Swept Area

Finding the breakthrough position of horizontal wells is essential to water plugging and improving oil production in bottom water drive reservoirs. Physical modeling was carried out in this paper to research the law of bottom water’s movement. The experimental results indicated that: pressure drop in wells, well trajectory and area reservoir heterogeneity were all sensitive factors for breakthrough of bottom water, and the entry points of horizontal wells were determined by the combined function of them. In different well trajectory models, the concave down part of the well cooperate with pressure drop influenced the breakthrough position. Bottom water below the heel end reached the well earliest if the concave down part located at the heel end. When the concave part located at the middle of the well, the two factors played role respectively which resulted in breaking through of bottom water at two places with larger swept area. In different heterogeneous models, permeability difference and pressure drop were both favorable factors for bottom water’s non-uniformly rise. In the model that the heel end located at high permeability part, bottom water under the heel end reached the well earliest. If the heel end was set at the low permeability part, the breakthrough of bottom water occurred at the middle of the well.

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