Seismic inversion applied to geopressure prediction in the area with structure uplifting and erosion—construction of formation pressure gradient system of the Plio‐Pleistocene strata, southwestern Taiwan

2009 ◽  
Author(s):  
Shi‐Chie Fuh ◽  
Tzy‐Yi Chang ◽  
Yu‐Liang Yang ◽  
Jen‐Yang Lin ◽  
Shov‐Chian Liang
Keyword(s):  
Pressure Gradient ◽  
Seismic Inversion ◽  
Gradient System ◽  
Formation Pressure ◽  
Southwestern Taiwan

A Study of Influential Factors of Advance Water Injection in Extra-Low Permeability Reservoir

2014 ◽  
Vol 487 ◽  
pp. 255-258
Author(s):  
Jin Gang He ◽  
Kao Ping Song ◽  
Jing Yang ◽  
Bao Gang Sun ◽  
Si Chen ◽  
...  
Keyword(s):  
Pressure Gradient ◽  
Early Stage ◽  
Retention Rate ◽  
Water Injection ◽  
Stress Sensitivity ◽  
Influential Factors ◽  
Low Permeability ◽  
Formation Pressure ◽  
Low Permeability Reservoir ◽  
Start Up

This paper study on the permeability, start-up pressure gradient and stress sensitivity of advance water injection in extra-low permeability reservoir in Fuyu Oil layer of Daqing Oilfield. Experimental results show that the reasonable formation pressure level should be at about 120% in the advance water injection experiment, advanced water injection in the the early stage have higher oil production, the water breakthrough, earlier than synchronous water injection has certain inhibitory effect of water cut rise; Under the premise of advance water injection can overcome the start-up pressure, the lower the level of the reservoir permeability, the higher improve recovery efficiency of the proportion; permeability retention rate increase by about 22% with 5×10-3μm2 core and effectively overcome the stress sensitivity of low permeability reservoir damage; Advanced water injection can overcome stress sensitivity and restoring formation pressure, all that influence the start-up pressure gradient, which significantly reduce the start-up pressure gradient.

Study of Turbulence Models in Flows Through Adverse Pressure Gradient System

2005 ◽  
Author(s):  
E. Karunakaran ◽  
V. Ganesan
Keyword(s):  
Experimental Data ◽  
Flow Field ◽  
Pressure Gradient ◽  
Numerical Simulations ◽  
Three Dimensional ◽  
Turbulence Models ◽  
Adverse Pressure Gradient ◽  
Reynolds Stress Model ◽  
Gradient System ◽  
Field Development

This paper is concerned with the study of performance of popular turbulence models used in the CFD analysis. Turbulence models considered for evaluation include the eddy viscosity models and the Reynolds stress model. The recent k-ε-v2-f model recommended for a flow with separation is also studied. Evaluation of the turbulence models in the present study focuses on a three-dimensional flow field development with adverse pressure gradient and flows that simulate wall-bounded turbulence. Numerical calculations are performed using SIMPLE based algorithm. Nowadays, decelerating flow in a diffuser is assessed by numerical simulations and the validation is done with experimental results. A comparison of the numerical results and the experimental data are presented. The main objective of the comparison is to obtain information on how well the numerical simulations representing the flow field with the standard turbulence models, are able to reproduce the experimental data.

scholarly journals The problem of abnormally low formation pressure on the oil and gas fields in Ukraine

2020 ◽  
pp. 17-22
Author(s):  
A. Pokhylko
Keyword(s):  
Pressure Gradient ◽  
Oil And Gas ◽  
Low Pressure ◽  
Formation Pressure ◽  
Gas Field ◽  
Oil And Gas Fields ◽  
Geological Conditions ◽  
Remaining Oil ◽  
Oil And Gas Field ◽  
Gas Fields

The article presented information about specific of geological conditions depleted oil and gas fields, which has Remaining Oil and Gas in Place. The reasons of abnormally low pressure nascency in the deposit has been analyzed. The article presents information about influence of geodynamic processes and structural and tectonics of Earth crust to formation pressure. The information about availability of initial abnormally low formation pressure in Ukrainian Oil and Gas-Condensate fields has been written. Supposition of nascence the abnormally low formation pressure in difficult oil/water/gas saturation geological formation has been analyzed. The drop of pressure in of initial formation has been analyzed and researched. The article presented that drop of pressure gradient in main Ukrainian oil and gas fields is equal to the value of abnormally low formation pressure.The problems of considerable remaining Oil and Gas in with abnormally low pressure in Ukrainian oil and gas field deposit has been analyzed. The information about oil and gas reservoir conditions of depleted field and brown fields in Ukraine has been analyzed.The plot of the formation pressure gradient decreasing for Chornukhynske, Denysivske, Solokhivske, Druzheliubivske, Tymofiivske and Yablunivske fields has been presented. The drop of pressure to abnormally low in Chornukhynske, Denysivske, Solokhivske, Druzheliubivske, Tymofiivske and Yablunivske fields has been established. The problems of drilling and cementing in the well with abnormally low pressure has been describe. Difficult geological conditions in Ukrainian oil and gas field deposit has been analyzed.The article shows the importance to control parameters of all technological liquids, especially density of drilling and cementing liquid in a time of drilling well with abnormally low pressure. The article shows the aspect of the using of lightweight grouting solutions for mounting wells with abnormally low reservoir pressures, the importance of controlling the contamination of the bottom zone of the formation and preventing the occurrence of hydraulic fracturing during cementing.

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