scholarly journals A Novel Methodology for Production Decline Analysis in Tight Gas Reservoirs: A Case Study from Sulige Tight Gas Field

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Xiaofeng Li ◽  
Lili Liu ◽  
Jiaojiao Liu ◽  
Zhichao Li ◽  
Xiaoliang Zhao
Keyword(s):  
Flow Regime ◽  
Flow Characteristics ◽  
Empirical Method ◽  
Tight Gas ◽  
Gas Wells ◽  
Gas Reservoirs ◽  
Gas Field ◽  
Linear Flow ◽  
Graphical Technique ◽  
Straight Lines

Study shows that decline exponents of gas wells in Sulige Tight Gas Field vary during their life cycle. However, decline analysis methods with variable decline exponent have not been developed so far. To address this problem, a simple-yet-effective method is proposed. In this method, the fracture linear flow regime and the channel linear flow regime, which appear two straight lines on the coordinate axis ( 1 / q vs. t ), respectively, are used to carry out the decline analysis. Each regime has a different slope and intercept (in the form of 1 / q vs. t ), which leads to a useful graphical technique for predicting gas rate. The graphical technique is verified by matching actual gas rate and predicting future gas rate trend. Theoretically, the influence of the two slopes and intercepts in the graphical technique on the rate decline is also studied. Aiming at decline analysis for tight gas wells with variable decline exponents, this paper proposes a novel method using linear flow characteristics, which ingeniously avoids the establishment of an empirical method to deal with variable decline exponent. The method in this study can help for better understanding of decline analysis of tight gas wells in a theoretical manner.

Some Scenarios for Long-Term Transient Linear Flow in Tight Gas Reservoirs - Field Examples

2003 ◽  
Author(s):  
J.A. Arevalo-Villagran ◽  
R.A. Wattenbarger ◽  
F. Garcia-Hernandez ◽  
F. Samaniego-Verduzco
Keyword(s):  
Tight Gas ◽  
Gas Reservoirs ◽  
Linear Flow ◽  
Tight Gas Reservoirs

Influence of Back Pressure on Testing Starting Pressure Gradient in Low Permeability Gas Field

2012 ◽  
Vol 524-527 ◽  
pp. 1460-1464
Author(s):  
Jian Yan ◽  
Xiao Juan Liu
Keyword(s):  
Pressure Gradient ◽  
Gas Flow ◽  
Water Saturation ◽  
Flow Characteristics ◽  
Low Permeability ◽  
Gas Reservoirs ◽  
Gas Field ◽  
Outlet Pressure ◽  
Test Conditions ◽  
Starting Pressure Gradient

For the existence of formation water, the capillary force increases when the gas flow in the cores, so the flow may display starting pressure gradient. However, during the lab testing, sometimes it is found that the starting pressure gradient changes in different test conditions: when the outlet pressure is atmosphere, only the water saturation reaches critical value (Sw)c, the quasi starting pressure exists; but when the outlet pressure is not atmosphere; it is easy to find the quasi staring pressure in the same water saturation. And the quasi starting pressure under the later condition is larger than that in former condition. It is also found that the quasi starting pressures are both power function to the ratio of core coefficient and water saturation. The experimental results provide some theoretical references for recognizing the flow characteristics in low permeability gas reservoirs.

Research Progress in Calculation Methods for Single-Well Dynamic Reserves of Gas Reservoirs

2014 ◽  
Vol 1044-1045 ◽  
pp. 401-405
Author(s):  
Hai Dong Shi
Keyword(s):  
High Efficiency ◽  
Research Progress ◽  
Calculation Methods ◽  
Gas Wells ◽  
Gas Reservoirs ◽  
Gas Field ◽  
Well Spacing ◽  
Well Pattern ◽  
Single Well ◽  
Gas Fields

Dynamic reserves are the important basis for determining the reasonable deliverability of gas wells and well spacing density and also the foundation for the overall development plan of a gas field. Therefore, the evaluation of dynamic reserves of gas wells is crucially important to developing gas fields with high efficiency, optimizing well pattern and shortening development period. For this reason, this paper arranges and analyzes systematically a series of calculation methods for dynamic reserves of single gas well, which have arisen in recent years, and identifies the calculation methods for different types of gas reservoirs.

scholarly journals Classification and Application of Tight Gas Wells Based on Cluster Analysis

2021 ◽  
Vol 2095 (1) ◽  
pp. 012099
Author(s):  
Zhenhua Cai ◽  
Chuanshuai Zuo ◽  
Jianying Zhu ◽  
Peng Qin ◽  
Baojiang Duan ◽  
...  
Keyword(s):  
Liquid Medium ◽  
High Energy ◽  
Low Energy ◽  
Production Performance ◽  
Tight Gas ◽  
Medium Energy ◽  
Gas Wells ◽  
Gas Field ◽  
Gas Well ◽  
Production Characteristics

Abstract The tight gas field is greatly affected by pressure in the development process. Due to the different production time and formation pressure of each well in the gas field, the production characteristics of the gas well are obviously different. After the gas well sees water, it is impossible to formulate production measures efficiently and accurately. Therefore, by analyzing the production performance characteristics of gas wells, this paper carries out the classification research of tight gas wells, and formulates the corresponding production measures according to the classification results. Taking gas well energy and liquid production intensity as the reference standard of gas well classification, the dynamic parameter indexes characterizing gas well energy and liquid production intensity are established. Gas wells with different production characteristics are divided into six categories by clustering algorithm: high energy-low liquid, high energy-high liquid, medium energy-low liquid, medium energy high-liquid, low energy-low liquid, low energy-high liquid. Then the classification method of tight gas well is formed. In this paper, 50 wells in Linxing block are selected as the research object. The research results show that most of the wells in Linxing block are located in area V, belonging to low energy and low liquid wells. It is recommended to implement intermittent production. The classification based on gas well energy and liquid production intensity are of guiding significance for the formulation of production measures in the Linxing block.

scholarly journals Improving the productivity of gas wells by stimulating “tight” formations - perspectives for continuation of exploitation in Transylvania basin

2021 ◽  
Vol 342 ◽  
pp. 02001
Author(s):  
Diana-Andreea Lupu ◽  
Lazăr Avram
Keyword(s):  
High Pressures ◽  
Tight Gas ◽  
Gas Wells ◽  
Gas Reservoirs ◽  
New Production ◽  
Economical Analysis ◽  
Tight Formations ◽  
Geophysical Investigations ◽  
Gas Fields

The current circumstances of exploitation of natural gas fields in the Transylvanian basin under the rehabilitation concept which aims to maximize the productivity of wells and implicitly increase recovery factors, justifies the assessment of new perspectives for further exploitation of Badenian formations, in which gas accumulations are classified as being tight gas reservoirs types. The concept of stimulating productivity using high pressures in the Transylvanian basin has remained under the significance of the research, therefore it is appropriate to resume analysis of identifying new production technology by integrating new geological data acquired and other geophysical investigations. The current paper presents through a case study the process of identifying a candidate well for stimulation based on the geological-technological considerations, and then, performing a technical-economical analysis to support the proposed program.

Analytical modeling of linear flow in single-phase tight oil and tight gas reservoirs

2018 ◽  
Vol 171 ◽  
pp. 1084-1098 ◽  
Author(s):  
Hamid Behmanesh ◽  
Hamidreza Hamdi ◽  
Christopher R. Clarkson ◽  
John M. Thompson ◽  
David M. Anderson
Keyword(s):  
Analytical Modeling ◽  
Single Phase ◽  
Tight Oil ◽  
Tight Gas ◽  
Gas Reservoirs ◽  
Linear Flow ◽  
Tight Gas Reservoirs
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