A Workflow to Model Performance of Low Permeability Reservoirs for Devising Most Optimal Development Strategy Using Rate Transient Analysis and Single Well Modeling

2017 ◽  
Author(s):  
Shivam Sharma ◽  
Siddhanta Batshas ◽  
Sameer Joshi ◽  
Vinil Reddy ◽  
Sameer Chhabra ◽  
...  
Keyword(s):  
Development Strategy ◽  
Transient Analysis ◽  
Model Performance ◽  
Low Permeability ◽  
Optimal Development ◽  
Rate Transient Analysis ◽  
Single Well ◽  
Low Permeability Reservoirs

Applying Rate Transient Analysis (RTA) to integrate geological and engineering data

2013 ◽  
Vol 53 (2) ◽  
pp. 473
Author(s):  
Nicholas Kwok
Keyword(s):  
Transient Analysis ◽  
Initial Pressure ◽  
Low Permeability ◽  
Late Time ◽  
Reservoir Pressure ◽  
Potential Consequence ◽  
Time Data ◽  
Engineering Data ◽  
Rate Transient Analysis ◽  
Measured Property

The Blasingame typecurve in Fekete’s Rate Transient Analysis (RTA) software has been used at Santos to increase the understanding and integration of well and reservoir data; however, the authors have discovered that in some cases the tool produced anomalous results, such as permeability being too low. The potential consequence of this was incorrectly writing off reserves or making projects (in particular compression projects) fail economic tests. After testing various hypotheses, a simple yet unorthodox solution was only discovered in a field where the anomaly was more profound, and required integrating geology and geophysics to explain it. This solution has since been applied in RTA models across numerous other fields, and it has improved the quality and confidence of these models. The solution was the realisation that in many cases the accessed gas in place (GIP) increased over time, but the underlying model in RTA assumes a single tank, linear P/z. Matching the RTA model with the initial reservoir pressure and final accessed GIP results in over-predicting the reservoir pressures, resulting in an artificially low permeability. The authors discovered that the appropriate well and reservoir parameters could be obtained by matching the late time data using a lower initial reservoir pressure value corresponding to when the well had accessed the final GIP volume but not the initial reservoir pressure. This step was initially regarded to be counter-intuitive as the initial pressure is a measured property. Numerous reviews have endorsed this methodology, which is now being used as a standard at Santos.

Methodology for Determination of Low-Permeability Reservoirs Optimal Development Plan

2016 ◽  
Author(s):  
E. V. Belonogov ◽  
A. A. Pustovskikh ◽  
D. A. Samolovov ◽  
A. N. Sitnikov
Keyword(s):  
Development Plan ◽  
Low Permeability ◽  
Optimal Development ◽  
Low Permeability Reservoirs

Application of the Imitation Horizontal well Technique in the Development of Low Permeability Reservoirs

2013 ◽  
Vol 734-737 ◽  
pp. 1350-1353
Author(s):  
Yan Dong ◽  
An Zhu Xu
Keyword(s):  
Horizontal Well ◽  
Influence Factors ◽  
Oil Production ◽  
Low Permeability ◽  
Daily Production ◽  
Drainage Radius ◽  
Well Pattern ◽  
Single Well ◽  
Lower Permeability ◽  
Low Permeability Reservoirs

The fluid flowing resistance increase and the water absorbing capacity reduce due to the threshold pressure gradient and media deformation of the low permeability reservoirs in the course of development. The oil production of vertical wells may decrease fastly and the controlled reservers are hard to recover. The development effects are not satisfied. Through great fracturing measurements create many fractures, and fractures extended along the direction of well line, the long fracture channels were formed like horizontal well segments. This kind of long fracture was called as horizontal segment of imitation horizontal well. It can broad drainage radius in production well and increase controlled reserves and daily oil production of single well. In this paper, the influence factors of the low permeablity reservoirs development by imitation horizontal wells were analysised. Through well pattern, well distance, line distance, injector and producer parameters and fracturing parameters of imitation horizontal well optimization, drainage radius in lower permeability reservoirs can be reached to 200 meters, the daily production in single well can increase two times of that before, and the production result was improved greatly in lower permeability reservoirs development.

A New Mathematical Model of Tight Formation for Productivity Transient Analysis with Additional Gas Driving

2021 ◽  
Author(s):  
Xiaoliang Zhao ◽  
Jiali Zhang ◽  
Xinwei Liao
Keyword(s):  
Transient Analysis ◽  
Phase Distribution ◽  
Gas Injection ◽  
Stress Sensitivity ◽  
Carbonate Reservoir ◽  
Low Permeability ◽  
Analysis Model ◽  
Damage Coefficient ◽  
Single Well ◽  
Permeability Damage

Abstract During the gas injection development of low-permeability carbonate reservoirs, due to the complexity of the reservoir and the complexity of the fluid phases, the current productivity evaluation methods are no longer applicable. In this paper, considering factors such as fracture characteristics, stress sensitivity, and phase distribution, a low-permeability carbonate reservoir gas injection development productivity transient analysis model is established. The results of the study show that the larger the value of permeability damage coefficient, the stronger the curve of the production curve will bend toward the pressure axis. This is because the larger the value of permeability damage coefficient, the more severe the stress sensitivity of the formation is, which shows that rock deformation has an important impact on production. When two phases appear at the bottom of the well, the seepage resistance increases due to the two-phase flow, which in turn causes the productivity of a single well to rapidly decrease. With the decrease of bottom hole pressure, this resistance will increase significantly and the productivity of a single well will decline rapidly.

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