scholarly journals Practical Well Test Analysis of a Hydraulically Fractured Low Permeability Gas Reservoir: A Case History

2008 ◽  
Vol 20 (1) ◽  
pp. 47-59
Author(s):  
Hazim N. Dmour
Keyword(s):  
Case History ◽  
Low Permeability ◽  
Well Test ◽  
Well Test Analysis ◽  
Gas Reservoir ◽  
Test Analysis

Well-Test Analysis in Low-Permeability Multilateral Wells

2005 ◽  
Author(s):  
A.C. Gringarten ◽  
R. Sharma ◽  
A.K. Rajvanshi
Keyword(s):  
Low Permeability ◽  
Well Test ◽  
Well Test Analysis ◽  
Test Analysis

The New Methods for Non-Steady Productivity Prediction of Condensate Gas Reservoir and the Application Evaluation

2012 ◽  
Vol 233 ◽  
pp. 401-404
Author(s):  
Jin Pang ◽  
Hong Liu ◽  
Xi Nan Yu
Keyword(s):  
Production System ◽  
System Analysis ◽  
Well Test ◽  
New Production ◽  
Well Test Analysis ◽  
Gas Reservoir ◽  
Test Analysis ◽  
Analysis Methods ◽  
Wellbore Flow ◽  
Gas Nozzle

In view of the existing shortcomings of the analysis methods for the production system of conventional condensate gas well, the new method that adopts the non-steady gas reservoir seepage and the wellbore coupling has been proposed in this paper, in other words, the gas nozzle control, the wellbore flow and the reservoir seepage have been considered as the coupling entirety; the traditional nodal analysis has been combined with the well test analysis of non-steady seepage; the new production system analysis methods have been employed to discuss the characteristics of gas reservoir seepage, wellbore flow and gas reservoir boundary; at the same time, the changing trends of indicators in the development process have been also analyzed. Afterwards, the coordination state and the changes of parameters of the production system can be predicted in different production methods and different times. And the better results can be obtained through the application evaluation of YK1.

scholarly journals Characteristic Value Method of Well Test Analysis for Horizontal Gas Well

2014 ◽  
Vol 2014 ◽  
pp. 1-10
Author(s):  
Xiao-Ping Li ◽  
Ning-Ping Yan ◽  
Xiao-Hua Tan
Keyword(s):  
Mathematical Models ◽  
Outer Boundary ◽  
Vertical Direction ◽  
Well Test ◽  
Well Test Analysis ◽  
Gas Reservoir ◽  
Test Analysis ◽  
Gas Well ◽  
Characteristic Value ◽  
Wellbore Storage

This paper presents a study of characteristic value method of well test analysis for horizontal gas well. Owing to the complicated seepage flow mechanism in horizontal gas well and the difficulty in the analysis of transient pressure test data, this paper establishes the mathematical models of well test analysis for horizontal gas well with different inner and outer boundary conditions. On the basis of obtaining the solutions of the mathematical models, several type curves are plotted with Stehfest inversion algorithm. For gas reservoir with closed outer boundary in vertical direction and infinite outer boundary in horizontal direction, while considering the effect of wellbore storage and skin effect, the pseudopressure behavior of the horizontal gas well can manifest four characteristic periods: pure wellbore storage period, early vertical radial flow period, early linear flow period, and late horizontal pseudoradial flow period. For gas reservoir with closed outer boundary both in vertical and horizontal directions, the pseudopressure behavior of the horizontal gas well adds the pseudosteady state flow period which appears after the boundary response. For gas reservoir with closed outer boundary in vertical direction and constant pressure outer boundary in horizontal direction, the pseudopressure behavior of the horizontal gas well adds the steady state flow period which appears after the boundary response. According to the characteristic lines which are manifested by pseudopressure derivative curve of each flow period, formulas are developed to obtain horizontal permeability, vertical permeability, skin factor, reservoir pressure, and pore volume of the gas reservoir, and thus the characteristic value method of well test analysis for horizontal gas well is established. Finally, the example study verifies that the new method is reliable. Characteristic value method of well test analysis for horizontal gas well makes the well test analysis process more simple and the results more accurate.

scholarly journals Study on Evaluation Method of Water Injection Efficiency in Low-Permeability Reservoir

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Qiang Yu ◽  
Xinjie Wang ◽  
Yifei Wang ◽  
Xingjiao Zhang
Keyword(s):  
Development Strategy ◽  
Evaluation Method ◽  
Water Injection ◽  
Low Permeability ◽  
Well Test ◽  
Well Test Analysis ◽  
Test Analysis ◽  
Low Permeability Reservoir ◽  
Production Ratio ◽  
Ultralow Permeability

Low-permeability reservoirs, especially ultralow-permeability reservoirs, usually show a problem of ineffective water injection which leads to low pressure with high injection-production ratio. It is urgent to determine the direction and proportion of ineffective water injection, so as to guide the adjustment of water injection development. Based on the theory of percolation mechanics and combined with the modern well test analysis method, the determination method of effective water injection ratio was established. This method can not only judge the direction of injected water but also determine the proportion of invalid injected water. This method was applied on typical oil reservoirs; the evaluation results showed that extremely low permeability and ultralow permeability usually exist the situation of water holding around the injected well which is almost 20% of the injected water. Some areas existed the water channeling; the evaluation results showed that the water channeling was closely related with sedimentary microfacies rather than microfractures, and the invalid injection accounts are about 45% of the injected water. The method is simple and feasible, which can provide technical reference for the development strategy adjustment of water drive development in low-permeability reservoir.

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