New Approach of Synergizing Advanced Well Test Deconvolution, Rate Transient Analysis and Dynamic Modeling in Evaluating Reservoir Compartmentalization Uncertainty at K Field in Sarawak Basin; A Case Study

2019 ◽  
Author(s):  
Ali Al-Amani Hj Azlan ◽  
Wan Mohd Sharif Wan Muda ◽  
Alireza Hajizadeh Mubaraki ◽  
Khairul Ezee Azreen M Khir ◽  
Norhayati M Sahid ◽  
...  
Keyword(s):  
Dynamic Modeling ◽  
Transient Analysis ◽  
Well Test ◽  
New Approach ◽  
Rate Transient Analysis ◽  
Reservoir Compartmentalization

Unified Pressure and Rate Transient Analysis of Production and Shut-in Data from Fractured Horizontal Wells

2021 ◽  
Author(s):  
HanYi Wang ◽  
Mukul Sharma ◽  
Harold McGowen
Keyword(s):  
Transient Analysis ◽  
Continuous Production ◽  
Short Term ◽  
New Approach ◽  
Step Rate ◽  
Bottom Hole ◽  
Rate Transient Analysis ◽  
Formation Pore Pressure ◽  
Fractured Horizontal Wells

Abstract Market-induced production shut-downs and restarts offer us an opportunity to gather step-rate and shut-in data for pressure transient analysis (PTA) and rate transient analysis (RTA). In this study, we present a unified transient analysis (UTA) to combine PTA and RTA in a single framework. In this new approach continuous production data, step-rate data, shut-in data and re-start data can be visualized and analyzed in a single superposition plot, which can be used to estimate both Afk and infer formation pore pressure in a holistic manner by utilizing all available data. Most importantly, we show that traditional log-log and square root of time plots can lead to false interpretation of the termination of linear-flow or power-law behavior. Field cases are presented to demonstrate the superiority of the newly introduced superposition plot, along with discussion on the calibration of long-term bottom-hole pressure with short-term measurements.

Systematic Application of Pressure and Temperature Transient Analysis in an Oil Field: A Case Study

2021 ◽  
Author(s):  
Khafiz Muradov ◽  
Akindolu Dada ◽  
Sultan Djabbarov
Keyword(s):  
Transient Analysis ◽  
Management Practices ◽  
Oil Field ◽  
Well Test ◽  
Transient Pressure ◽  
Systematic Application ◽  
Temperature Transient ◽  
Fluid Properties ◽  
Temperature Transient Analysis

Abstract Pressure Transient Analysis (PTA) methodology has long enabled well testing to become a standard routine. Modern, well and reservoir monitoring and management practices are now unthinkable without the well test-derived estimates of KH products, skin factors, radii of reservoir boundaries, etc. Temperature data, measured together with the pressure, is widely available. Multiple methods for Temperature Transient Analysis (TTA) have also been developed, but have not yet gained due recognition. Few examples of a systematic application of PTA and TTA (or, in general, Pressure and Temperature Transient Analysis PTTA) on a field scale have been published. Given that the TTA radius of investigation is much smaller than that for PTA, the TTA tends to explore the near-wellbore properties including the near-wellbore permeability profile, depth of damage, multi-layer parameters, fluid properties, etc. This complements the far-field estimates made by PTA, resulting in the PTTA providing a more holistic and complete picture of the state of the reservoir and fluids around the wellbore. This work demonstrates a case study of a systematic application of PTTA methods to wells in a green, oil field. The wells are equipped with a state-of-the-art, downhole, permanent monitoring equipment. A user-friendly, bespoke toolbox has been developed to carry out PTTA analysis in this field. Dozens of transient events that occurred in the first few years of the field production life have been analyzed using PTTA. There are multiple examples of this PTTA analysis demonstrating improved characterization of the reservoir, near-wellbore, fluid, and multi-layer properties. This work will be insightful to those looking to find out what additional, useful information (like reservoir and fluid properties) can be extracted from the traditional well-test, transient pressure and temperature measurements at no extra cost.

Comparing Completion Designs Using Normalized Rate Transient Analysis – Proposed Workflow and Case Study

2018 ◽  
Author(s):  
Matthew Ockree ◽  
Kenneth G. Brown ◽  
Joseph H. Frantz ◽  
Katharine Voller ◽  
Jonathan He
Keyword(s):  
Transient Analysis ◽  
Rate Transient Analysis

scholarly journals Diagnostic assessment of reservoir response to fracturing: a case study from Hydraulic Fracturing Test Site (HFTS) in Midland Basin

2021 ◽  
Author(s):  
Debotyam Maity ◽  
Jordan Ciezobka
Keyword(s):  
Data Collection ◽  
Hydraulic Fracturing ◽  
Transient Analysis ◽  
Test Site ◽  
Natural Fracture ◽  
Significant Heterogeneity ◽  
Well Production ◽  
Area Of Interest ◽  
Rate Transient Analysis

AbstractThis paper outlines a data collection and diagnostics case study involving multiple horizontal shale wells. We look at well production profiles using rate transient analysis, differences in near wellbore complexity, geologic variations within the area of interest, as well as compositional differences in the rocks based on cores obtained from within the stimulated reservoir. The Hydraulic Fracturing Test Site is a multi-well experiment involving stimulation of unconventional shale wells in the southeastern Midland portion of the Permian Basin. The targeted formations include both the upper as well as the middle Wolfcamp formations, also referred alternatively as Wolfcamp A and Wolfcamp B. Data integration and analysis shared in this paper help us understand the various geologic controls impacting well productivity, particularly the wide variance observed between the Wolfcamp A and Wolfcamp B formations. Rate transient analysis indicates similar system permeabilities for stimulated wells. However, we observe higher effective fracture half-lengths for upper Wolfcamp wells. Using observations from 3D seismic interpretations (such as pad scale faults) as well as petrophysical and image log data, we highlight the substantial differences in stimulation as we move along the well laterals from the heel toward the toe sections. These differences are further reconciled with observations from zones with high data density at the core locations through stimulated rock, as well as independent data such as microseismic emissions. At the test site, Wolfcamp A was found to be relatively quartz rich with significant heterogeneity whereas Wolfcamp B is richer in clay and organic content. This impacts the geomechanical characteristics of the rock mass with much higher natural fracture density in the shallower interval. Thus, the fracture growth is more uniform in the deeper interval and more heterogeneous with branching likely in upper interval. Increased complexity also leads to consistently better productivity from the wells in the shallower interval as demonstrated from RTA results. This case study is unique because it provides valuable insights from actual sampling of the stimulated zones in hydraulically fractured wells and helps understand impact of various factors that contribute toward variability in well production. The findings from this study provides insights into need for optimization of completion designs in the various Wolfcamp landing zones, such as optimization of cluster or fracture spacing in various Wolfcamp intervals. In addition, it provides a useful template for data collection and research direction in future field test sites of similar nature in unconventional reservoirs.

Optimizing Completion Design and Well Spacing in the Powder River Basin Niobrara Oil Play

2021 ◽  
Author(s):  
Blake Burget ◽  
Neal Dannemiller ◽  
Dylan Garrett ◽  
Erik Kling
Keyword(s):  
River Basin ◽  
Transient Analysis ◽  
Powder River Basin ◽  
Well Spacing ◽  
Rate Transient Analysis ◽  
Oil Performance ◽  
Reservoir Simulator ◽  
Optimal Cluster

Abstract A seven-step workflow to help subsurface teams establish an initial thesis for optimal completion design (cluster spacing, proppant per cluster) and well spacing in emerging / under-explored resource plays is proposed and executed for the Powder River Basin Niobrara unconventional oil play. The workflow uses Rate Transient Analysis (RTA) to determine the Ac∗k parameter and then walks the reader through how to sequentially decouple the parameter into its constituent parts (frac height (h), number of symmetrical fractures achieved (nf), permeability (k) and fracture half-length (xf)). Once these terms were quantified for each of the case study wells, they were used in a black oil reservoir simulator to compare predicted verses actual cumulative oil performance at 30, 60, 90,120 & 180 days. A long-term production match was achieved using xf as the lone history match parameter. xf verses proppant per effective half-cluster yielded an R2 value of > 0.90. 28 simulation scenarios were executed to represent a range of cluster spacing, proppant per cluster and well spacing scenarios. Economics (ROR and/or NPV10/Net Acre) were determined for each of these scenarios under three different commodity pricing assumptions ($40/$2.50, $50/$2.50 and $60/$2.50). An initial thesis for optimal cluster spacing, proppant per designed cluster and well spacing were determined to be 12’, 47,500 lbs and 8-14 wells per section (based on whether or not fracture asymmetry is considered) when WTI and Henry Hub are assumed to be $50 & $2.50 flat.

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