Development Evaluations of Lenticular Shallow Gas Reservoirs with Bottom Water in Shengli Oilfields

2003 ◽  
Author(s):  
Ruyan Sheng ◽  
Chuanzhi Cui ◽  
Liangcheng Ding
Keyword(s):  
Bottom Water ◽  
Gas Reservoirs ◽  
Shallow Gas

Review of Case Histories of Two Shallow-Gas Reservoirs in China

2003 ◽  
Author(s):  
Ruyan Sheng ◽  
Zhenquan Li ◽  
Hua Liu ◽  
Xiyong Xiang
Keyword(s):  
Case Histories ◽  
Gas Reservoirs ◽  
Shallow Gas

Reserves Determination Using Type Curve Matching and Extended Material Balance Methods in the Medicine Hat Shallow Gas Field

1994 ◽  
Author(s):  
S. L. West ◽  
P. J. R. Cochrane
Keyword(s):  
Material Balance ◽  
Poor Quality ◽  
Curve Matching ◽  
Pressure Data ◽  
Gas Reservoirs ◽  
Shallow Gas ◽  
Gas Field ◽  
Type Curve ◽  
Balance Analysis ◽  
Diffusivity Equation

Tight shallow gas reservoirs in the Western Canada Basin present a number of unique challenges in accurately determining reserves. Traditional methods such as decline analysis and material balance are inaccurate due to the formations' low permeabilities and poor pressure data. The low permeabilities cause long transient periods not easily separable from production decline using conventional decline analysis. The result is lower confidence in selecting the appropriate decline characteristics (exponential or harmonic) which significantly impacts recovery factors and remaining reserves. Limited, poor quality pressure data and commingled production from the three producing zones results in non representative pressure data and hence inaccurate material balance analysis. This paper presents the merit of two new methods of reserve evaluation which address the problems described above for tight shallow gas in the Medicine Hat field. The first method applies type curve matching which combines the analytical pressure solutions of the diffusivity equation (transient) with the empirical decline equation. The second method is an extended material balance which incorporates the gas deliverability theory to allow the selection of appropriate p/z derivatives without relying on pressure data. Excellent results were obtained by applying these two methodologies to ten properties which gather gas from 2300 wells. The two independent techniques resulted in similar production forecasts and reserves, confirming their validity. They proved to be valuable, practical tools in overcoming the various challenges of tight shallow gas and in improving the accuracy in gas reserves determination in the Medicine Hat field.

Chalupki Debnianskie Field – Improving Drilling Success in Shallow Gas Reservoirs with VectorSeis®

2003 ◽  
Author(s):  
D.J. Tessman ◽  
E. Gruszczyk ◽  
Z. Trzesniowski ◽  
P. Misiaczek ◽  
P. Brettwood
Keyword(s):  
Gas Reservoirs ◽  
Shallow Gas

Non-Darcy Binomial Deliverability Equations for Partially Penetrating Vertical Gas Wells and Horizontal Gas Wells

2009 ◽  
Author(s):  
Tao Zhu ◽  
Jing Lu
Keyword(s):  
Bottom Water ◽  
Horizontal Wells ◽  
Vertical Wells ◽  
Gas Wells ◽  
Gas Reservoirs ◽  
Gas Reservoir ◽  
Gas Well ◽  
Increase Productivity ◽  
Flow Domain ◽  
Inflow Performance

Many gas reservoirs are with bottom water drive. In order to prevent or delay unwanted water into the wellbore, the producing wells are often completed as partially penetrating vertical wells, and more and more horizontal wells have been drilled in recent years in bottom water drive gas reservoirs to reduce water coning and increase productivity. For a well, non-Darcy flow is inherently a near wellbore phenomenon. In spite of the considerable study that non-Darcy behavior of fully penetrating vertical wells, there has been no study of a partially penetrating vertical well or a horizontal well in a gas reservoir with bottom water drive. This paper presents new binomial deliverability equations for partially penetrating vertical gas wells and horizontal gas wells, assuming that only radial flow occurs in the near wellbore non-Darcy’s flow domain. The inflow performance of a vertical gas well is compared with that of a horizontal gas well. The proposed equations can account for the advantages of horizontal gas wells.

A Semi-Analytical Model for Predicting Horizontal Well Performances in Fractured Gas Reservoirs With Bottom-Water and Different Fracture Intensities

2018 ◽  
Vol 140 (10) ◽  
Author(s):  
Yongsheng Tan ◽  
Haitao Li ◽  
Xiang Zhou ◽  
Beibei Jiang ◽  
Yongqing Wang ◽  
...  
Keyword(s):  
Porous Medium ◽  
Horizontal Well ◽  
Bottom Water ◽  
Flow Model ◽  
Numerical Solutions ◽  
Gas Reservoirs ◽  
Gas Reservoir ◽  
New Model ◽  
Well Completion ◽  
Wellbore Pressure

Numerical simulation and prediction studies on horizontal well performances in gas reservoir are foundation for optimizing horizontal well completion process. To gain more understanding on this theory, a steady-state reservoir model coupling with wellbore is developed in the fractured gas reservoirs with bottom-water and different fracture intensities to predict the horizontal well performances. Based on the equivalent flow assumption, the fractured porous medium is transformed into anisotropic porous medium so that the gas reservoir flow model can be developed as a new model that incorporates formation permeability heterogeneity, reservoir anisotropy, and gas reservoir damage. The wellbore flow model which considers pressure drops in the tubing is applied. We compare this paper model solutions for inflow profile along the well to the numerical solutions obtained from a commercial simulator (ECLIPSE 2011), and the result shows a very good agreement. Moreover, sensitive analysis, in terms of various linear densities of fractures, matrix permeability, fracture width, and wellbore pressure drop, is implemented. The results show that the new model developed in this study can obtain a more practical representation to simulate the horizontal wells performance in fractured gas reservoir with different fracture intensities and bottom-water, thus can be used to optimize the parameters in horizontal well completion of fractured gas reservoirs with different fracture intensities and bottom-water.

Development of New Sand Consolidation Fluid and Field Application in Shallow Gas Reservoirs

2011 ◽  
Author(s):  
Michael James Fuller ◽  
Ricardo Andres Gomez ◽  
Joel Gill ◽  
Cesar Roberto Guimaraes De Carvalho ◽  
Ardestya Ferta Abdurachman ◽  
...  
Keyword(s):  
Field Application ◽  
Gas Reservoirs ◽  
Shallow Gas

A Prediction of Water Breakthrough Time in Low Permeability Gas Reservoirs With Bottom Water

2011 ◽  
Author(s):  
Qinghui Zhang ◽  
XiangFang Li ◽  
Zhaojie Song ◽  
Bicheng Yan ◽  
Bangtang Yin ◽  
...  
Keyword(s):  
Bottom Water ◽  
Low Permeability ◽  
Breakthrough Time ◽  
Gas Reservoirs ◽  
Water Breakthrough

Analysis Development Status of A12 Reservoir

2013 ◽  
Vol 650 ◽  
pp. 664-666
Author(s):  
Lei Zhang ◽  
Guo Ming Liu
Keyword(s):  
Water Distribution ◽  
Bottom Water ◽  
Oil And Gas ◽  
Water Reservoir ◽  
Gas Reservoirs ◽  
Gas Drive ◽  
Oil And Gas Reservoir ◽  
Water Gas ◽  
Oil Gas ◽  
Gas Bearing

A12 oil and gas reservoirs in L Oilfield Carboniferous carbonate rocks of oil and gas bearing system, saturated with the gas cap and edge water and bottom water reservoir. The A12 oil and gas reservoir structure the relief of the dome-shaped anticline, oil, gas and water distribution controlled by structure, the gas interface -2785 meters above sea level, the oil-water interface altitude range -2940 ~-2980m, average-2960m. Average reservoir thickness of 23m, with a certain amount of dissolved gas drive and gas cap gas drive energy, but not very active edge and bottom water, gas cap drive index.

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