Increasing Production and Reserves in a Mature Field with Hydraulic Fracturing by Combining Fracture Pressure Analysis, Pressure Transient Analysis, and Rate Transient Analysis

2015 ◽  
Author(s):  
E. Murminacho ◽  
H. Sanchez ◽  
M. Lopez ◽  
R. G. Rachid ◽  
J. Maniere ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Transient Analysis ◽  
Pressure Transient Analysis ◽  
Pressure Transient ◽  
Fracture Pressure ◽  
Rate Transient Analysis ◽  
Mature Field ◽  
Pressure Analysis

scholarly journals An approximation of behind-casing hydraulic conductivity between layers from transient pressure analysis

DYNA ◽  
2019 ◽  
Vol 86 (210) ◽  
pp. 108-114
Author(s):  
Freddy Humberto Escobar ◽  
Angela María Palomino ◽  
Alfredo Ghisays Ruiz
Keyword(s):  
Hydraulic Conductivity ◽  
Transient Analysis ◽  
Test Interpretation ◽  
Well Test ◽  
Transient Pressure ◽  
Pressure Transient Analysis ◽  
Pressure Transient ◽  
Transient Pressure Analysis ◽  
Pressure Analysis

Flow behind the casing has normally been identified and quantified using production logging tools. Very few applications of pressure transient analysis, which is much cheaper, have been devoted to determining compromised cemented zones. In this work, a methodology for a well test interpretation for determining conductivity behind the casing is developed. It provided good results with synthetic examples.

Investigation of permeability change in the Bandanna Coal Formation of the Fairview Field using time-lapse pressure transient analysis

2019 ◽  
Vol 59 (1) ◽  
pp. 289 ◽  
Author(s):  
A. Salmachi ◽  
J. Barkla
Keyword(s):  
High Resolution ◽  
Transient Analysis ◽  
Time Lapse ◽  
Production Performance ◽  
Reservoir Pressure ◽  
Permeability Change ◽  
Pressure Transient Analysis ◽  
Pressure Transient ◽  
Coal Permeability ◽  
Rate Transient Analysis

Permeability of coal seam gas (CSG) reservoirs is stress/desorption dependent and may change during the life of the reservoir. This study investigates permeability change with depletion in several CSG wells in the Fairview Field: a prolific reservoir in the Bowen Basin, Australia. High-resolution pressure gauges at surface provide an opportunity to conduct time-lapse pressure transient analysis (PTA) on the wells that have multiple shut-ins. Pressure build-up tests can be replicated by calculating bottom-hole pressure when surface pressure (tubing and/or annulus) is recorded at high-resolution during any shut-in event. This eliminates the need to perform multiple well tests, which are time consuming and costly to run. The production history of 100 CSG wells was examined to find suitable candidates to perform time-lapse PTA. This was used to investigate how Bandanna Coal permeability changes with depletion. Three wells with high-quality shut-ins were identified and analysed to calculate effective permeability to gas and average reservoir pressure. The results indicate that coal permeability can enhance up to one order of magnitude during the life of a CSG well in the Fairview Field, and this can significantly improve production performance. These wells, located in a depleted area of the field, show rapid increase in permeability with decline in average reservoir pressure. The integration of rate transient analysis with the results of time-lapse PTA for one of the study wells reveals that the functional form of permeability increase is exponential in the study area, and a permeability modulus of –0.00678 psia–1 was obtained.

State of the Art in Characterization of Frac Stage Geometry and Conductivity Using Pressure Leakoff

2021 ◽  
Author(s):  
Mohamed Ibrahim Mohamed ◽  
Erdal Ozkan
Keyword(s):  
Hydraulic Fracturing ◽  
Hydraulic Fracture ◽  
Transient Analysis ◽  
State Of The Art ◽  
Low Cost ◽  
Pressure Data ◽  
Pressure Transient Analysis ◽  
Fracture Conductivity ◽  
Pressure Transient ◽  
Half Length

Abstract Pressure-transient analysis (PTA) is widely used in the industry to estimate fracture half-length, height, and skin due to hydraulic fracturing as well as reservoir parameters. PTA studies focus on pressure data from long shut-in periods and diagnostic fracture injection tests (DFITs), while analyzing the pressure data recorded during the hydraulic fracture treatment has been overlooked. This paper details the state-of-the-art in applying pressure transient analysis to better estimate hydraulic fracture conductivity and dimensions and improve treatment designs stage by stage. The initial portion of this paper describes the application of a novel and low-cost diagnostic method for post-fracture analysis. The bulk of the paper is dedicated to present case histories that illustrate the PTA of the recorded pressure data during treatment to obtain estimates of fracture dimensions and conductivity. The pressure recorded during each stage is processed to ensure the proper data quality and the pressure falloff at the end of the stage is filtered out. The pressure is then analyzed for multi-cluster, finite-conductivity fractures, to obtain the fracture half-length, conductivity, and leakoff. Calculated parameters from each stage are compared to provide insights into the hydraulic fracture design and confirm the adequacy of the treatment design along the well. The results from stage leakoff pressure analysis are very valuable in confirming relative fracture conductivity and providing a qualitative measure of fracture length and height. The total stimulated reservoir area (SRA) calculated using the proposed method yields comparable values to SRA obtained from buildup analysis. The information provided is as valuable and comparable as that from direct near-wellbore diagnostics, such as radioactive traces, temperature logging, real-time micro-seismic monitoring, and production logging. The paper proposes a novel, low-cost analytical PTA method for estimating fracture dimensions, skin, and leakoff coefficient. We illustrate – with several field cases – that conventional post-fracture techniques can be integrated with the stage by stage PTA analysis to provide not only a more consistent and systematic analysis but also a more accurate assessment of treatment effectiveness. The findings of this paper help improve the efficiency of multistage hydraulic fracturing stimulation of horizontal wells.

Fracture Geometry Calibration Using Multiple Surveillance Techniques

2022 ◽  
Author(s):  
Musallam Jaboob ◽  
Ahmed Al Shueili ◽  
Hussien Al Salmi ◽  
Salim Al Hajri ◽  
German Merletti ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Transient Analysis ◽  
Earth Model ◽  
Tight Gas ◽  
Radioactive Tracers ◽  
Multiple Sources ◽  
Pressure Transient Analysis ◽  
Fracture Geometry ◽  
Pressure Transient ◽  
Tight Gas Reservoir

Abstract An accurate Mechanical Earth Model (MEM) is of vital importance in tight gas reservoirs where hydraulic fracturing is the only way to produce hydrocarbons economically. The Barik tight gas reservoir is the main target in Khazzan and Ghazeer Fields at the Sultanate of Oman (Rylance et al., 2011). This reservoir consists of multiple low-permeability sandstone layers interbedded with marine shales. A good understanding of the fracture propagation in such a reservoir has a major effect on completion and fracturing design. The MEM derived from sonic logs and calibrated with core data needs to be further validated by independent measurements of the fracturing geometry. Multiple surveillance techniques have been implemented in the Barik reservoir to validate the MEM and to match observations from hydraulic fracturing operations. These techniques include closure interpretation using a wireline deployed formation testing assembly, the use of mini-frac injection tests with deployed bottomhole pressure gauges, execution of post injection time-lapse temperature logging, the injection of radioactive tracers, associated production logging, subsequent pressure transient analysis and other techniques. A cross-disciplinary team worked with multiple sources of data to calibrate the MEM with the purpose of delivering a high-confidence prediction of the created fracture geometry, which honors all available surveillance data. In turn, this validation approach provided a solid basis for optimization of the completion and fracturing design, in order to optimally exploit this challenging reservoir and maximize the economic returns being delivered. For example, combination of stress testing with radioactive tracers provided confidence in stress barriers in this multilayered reservoir. Pressure transient analysis allowed to calibrate mechanical model to match fracturing half-length that is contributing to production. This paper provides extensive surveillance examples and workflows for data analysis. Surveillance of this degree in the same well is uncommon because of the associated time and cost. However, it provides unique value for understanding the target reservoir. This paper demonstrates the Value Of Information (VOI) that can be associated with such surveillance and provides a concrete and practical example that can be used for the justification of future surveillance programs associated with the hydraulic fracturing operations.

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