Analysis of Pressure Fall-Off Curves Obtained in Water Injection Wells To Determine Injective Capacity and Formation Damage

10.2118/450-g ◽  
1955 ◽  
Vol 204 (01) ◽  
pp. 96-102 ◽  
Author(s):  
T.J. Nowak ◽  
G.W. Lester
Keyword(s):  
Water Injection ◽  
Formation Damage ◽  
Injection Wells ◽  
Pressure Fall

Errors Associated With the Application of the G-Function Plot for Analyzing Pressure Fall-Off Tests in Water Injection Wells

2021 ◽  
Author(s):  
Jun Wu ◽  
Iraj Ershaghi
Keyword(s):  
Research Study ◽  
Radial Flow ◽  
Flow System ◽  
Water Injection ◽  
Reservoir Modeling ◽  
Injection Wells ◽  
Analysis Technique ◽  
Fracture Closure ◽  
Closing Pressure ◽  
Pressure Fall

Abstract Castillo1 suggested the use of the G-Function plot based on the work of Nolte2. It has been a standard practice in the fracturing community to estimate the fracture closing pressure from a tangent to the G*dp/dg plot. In this analysis technique, the assumption is that a fracture has already developed under the high-pressure fracturing fluid. Then when the pumping is relaxed, one can estimate the fracture closing pressure. In many California waterfloods, the issue of maximum allowable injection gradient has been debated. Various solutions have been proposed to calculate a safe injection gradient. One method that has been promoted is the application of the G-function plot. In this paper, we maintain that this application can be misleading using the prescribed cartesian G function plots. We present the results of an extensive research study for analyzing pressure fall-off data using the G-Plot function. We studied a reappraisal of the G function plot using waterflood conditions where no prior fractures had formed, and no fracture closing pressure was meaningful or applicable. We show from analysis of generated data, using both numerical reservoir modeling and analytical derivations for a radial flow system, that fall-off tests analyzed using the cartesian G function can generate false indications of fracture closing where in fact, the entire injection has been based on radial flow homogeneous injection systems. We also studied systems with a pre-existing fracture before injection. We show that if such a reservoir system is subjected to injection and fall-off tests, again, one may compute a false indication of the irrelevant fracture closure pressure. We discuss how the cartesian scale used for the G function plot can be misleading for the analysis of fall-off test data.

Pressure Fall-Off in Water Injection Wells

10.2118/925-g ◽  
1958 ◽  
Vol 213 (01) ◽  
pp. 250-260 ◽  
Author(s):  
P. Hazebroek ◽  
H. Rainbow ◽  
C.S. Matthews
Keyword(s):  
Water Injection ◽  
Injection Wells ◽  
Pressure Fall

Pressure Fall-Off Analysis in Water Injection Wells Using the Tiab's Direct Synthesis Technique

2001 ◽  
Author(s):  
Sarfraz A. Jokhio ◽  
Djebbar Tiab ◽  
Hadjaz Abdessalam ◽  
Freddy H. Escobar
Keyword(s):  
Direct Synthesis ◽  
Water Injection ◽  
Injection Wells ◽  
Synthesis Technique ◽  
Pressure Fall

A New Method of Fall-Off Test in Water Injection Well in Tahe Oilfield

2013 ◽  
Vol 807-809 ◽  
pp. 2508-2513
Author(s):  
Qiang Wang ◽  
Wan Long Huang ◽  
Hai Min Xu
Keyword(s):  
Water Injection ◽  
Injection Well ◽  
Well Test ◽  
Well Bore ◽  
Residual Oil ◽  
Injection Wells ◽  
Oil Saturation ◽  
Tahe Oilfield ◽  
Fitting Method ◽  
Front Radius

In pressure drop well test of the clasolite water injection well of Tahe oilfield, through nonlinear automatic fitting method in the multi-complex reservoir mode for water injection wells, we got layer permeability, skin factor, well bore storage coefficient and flood front radius, and then we calculated the residual oil saturation distribution. Through the examples of the four wells of Tahe oilfield analyzed by our software, we found that the method is one of the most powerful analysis tools.

Development of an Optimized Formulation for Cleaning Water Injection Wells Drilled With Oil Based Systems

2007 ◽  
Author(s):  
Christine S.H. Dalmazzone ◽  
Amandine Le Follotec ◽  
Annie Audibert-Hayet ◽  
Allan Jeffery Twynam ◽  
Hugues M. Poitrenaud
Keyword(s):  
Water Injection ◽  
Injection Wells
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