Use of a New Rate-Integral Productivity Index in Interpretation of Underbalanced Drilling Data for Reservoir Characterization

2007 ◽  
Author(s):  
P.V. Suryanarayana ◽  
_ Kennedy ◽  
Ravimadhav N. Vaidya ◽  
Jan Wind
Keyword(s):  
Reservoir Characterization ◽  
Productivity Index ◽  
Underbalanced Drilling ◽  
Drilling Data ◽  
Integral Productivity

Reservoir Characterization during Underbalanced Drilling: Methodology, Accuracy, and Necessary Data

2002 ◽  
Author(s):  
Erlend H. Vefring ◽  
Gerhard Nygaard ◽  
Kjell Kåre Fjelde ◽  
Rolf Johan Lorentzen ◽  
Geir Nævdal ◽  
...  
Keyword(s):  
Reservoir Characterization ◽  
Underbalanced Drilling

scholarly journals Produkcja w rolnictwie w kontekście ochrony środowiska

2017 ◽  
Vol 104 (1) ◽  
pp. 7-21 ◽  
Author(s):  
Justyna Góral ◽  
Włodzimierz Rembisz
Keyword(s):  
Agricultural Policy ◽  
Productivity Index ◽  
Factor Productivity ◽  
Environmental Aspects ◽  
New Approach ◽  
Development Path ◽  
Farm Productivity ◽  
The Common ◽  
European Farming ◽  
Integral Productivity

The main goal of this work was to show the necessity of implementing enviromental aspects into existing agricultural productivity theories. The authors presented the issues of integral productivity and balanced intensification. A new approach to existing measures of farm productivity was discussed as well. Productivity index including environmental aspects (so called Environmentally Adjusted Total Factor Productivity) was showed. European farming, formed by the Common Agricultural Policy, currently implements the ideas of intensification and balanced progress most effectively. At the same time, it is on the development path enabling convergence of these two ideas.

Managed Pressure Drilling and Underbalanced Drilling Compounded Role in Solving the Exploration and Appraisal Challenges of Biogenetic Gas Resources in the United Arab Emirates -Case Study

2021 ◽  
Author(s):  
Ahmed Al Mutawa ◽  
Ibrahim Hamdy ◽  
Eias Daban Al Shamisi ◽  
Bassem El Yossef ◽  
Mohamed Sameer Amin ◽  
...  
Keyword(s):  
United Arab Emirates ◽  
Drilling Fluid ◽  
Productivity Index ◽  
Biogenic Gas ◽  
Hole Pressure ◽  
Bottom Hole Pressure ◽  
Underbalanced Drilling ◽  
Bottom Hole ◽  
Novel Approach ◽  
Managed Pressure Drilling

Abstract Biogenic gas resources have gathered importance recently due to its widespread availability, occurrence at geologically predictable circumstances, and existence at shallow depths. It is estimated that biogenic gas forms more than 20% of the global discovered reserves. However, the exploration and development of these unconventional resources come with numerous drilling and reservoir challenges. This paper showcases a novel approach used in the United Arab Emirates to overcome these challenges using managed pressure and underbalanced drilling. To tackle both reservoir and drilling challenges, a hybrid solution combining Underbalanced (UBD) and Managed Pressure Drilling (MPD) was applied. UBD was used to characterize the reservoir in terms of pressure and productivity index to ultimately enhance productivity by eliminating formation damage. MPD was used next to continue drilling through the problematic zone which had high instability due to the presence of highly sensitive salt, in addition to the presence of high pressure and loss zones. The fit for purpose hybrid application design allowed the operator to immediately switch between UBD and MPD conditions, as the well required with the same equipment. Three of the four targeted formations were in the 8 ½″ hole section, UBD was selected to drill the first reservoir formation which allowed pore pressure verification and avoided using excessive mud weight that was the culprit of many challenges like slow ROP, drilling fluid losses, bit balling, and fracking the formations. UBD has proved that mud weight can be reduced by 20%-30% comparing to conventional drilling. The second formation was a salt formation that has caused previously hole collapse and losses-kicks problems as heavy mud used to drill this salty formation. MPD used successfully drill this section by constant bottom hole pressure and lower mud weight as it was found from analyzing offset wells reports that hole collapse occurred at connections and pump off events. Constant Bottom Hole Pressure (CBHP) also eliminated tight spots and excessive reaming resulting in optimized drilling. The third formation used MPD as well to minimize overbalance pressure over previous sections while the fourth formation was drilled by UBD as it had a separate 6″ hole section as it formed an independent reservoir. The combined MPD and UBD approach eliminated most the NPT encountered in offset wells, enhanced Rate of Penetration (ROP) by 200% to 300% and slashed the well drilling time by 27 days.

scholarly journals Reservoir Characterization during Underbalanced Drilling of Horizontal Wells Based on Real-Time Data Monitoring

2014 ◽  
Vol 2014 ◽  
pp. 1-19 ◽  
Author(s):  
Gao Li ◽  
Hongtao Li ◽  
Yingfeng Meng ◽  
Na Wei ◽  
Chaoyang Xu ◽  
...  
Keyword(s):  
Real Time ◽  
Pore Pressure ◽  
Monitoring System ◽  
Flow Model ◽  
Reservoir Characterization ◽  
Horizontal Wells ◽  
Data Monitoring ◽  
Time Data ◽  
Underbalanced Drilling ◽  
Real Time Data

In this work, a methodology for characterizing reservoir pore pressure and permeability during underbalanced drilling of horizontal wells was presented. The methodology utilizes a transient multiphase wellbore flow model that is extended with a transient well influx analytical model during underbalanced drilling of horizontal wells. The effects of the density behavior of drilling fluid and wellbore heat transfer are considered in our wellbore flow model. Based on Kneissl’s methodology, an improved method with a different testing procedure was used to estimate the reservoir pore pressure by introducing fluctuations in the bottom hole pressure. To acquire timely basic data for reservoir characterization, a dedicated fully automated control real-time data monitoring system was established. The methodology is applied to a realistic case, and the results indicate that the estimated reservoir pore pressure and permeability fit well to the truth values from well test after drilling. The results also show that the real-time data monitoring system is operational and can provide accurate and complete data set in real time for reservoir characterization. The methodology can handle reservoir characterization during underbalanced drilling of horizontal wells.

Application of DFIT-FBA Tests Performed at Multiple Points in a Horizontal Well for Advanced Treatment Stage Design and Reservoir Characterization

2021 ◽  
Author(s):  
Danial Zeinabady ◽  
Behnam Zanganeh ◽  
Sadeq Shahamat ◽  
Christopher R. Clarkson
Keyword(s):  
Horizontal Well ◽  
Reservoir Characterization ◽  
Material Balance ◽  
In Situ Stress ◽  
Productivity Index ◽  
Multiple Points ◽  
Well Productivity ◽  
Balance Analysis ◽  
Flowing Material

Abstract The DFIT flowback analysis (DFIT-FBA) method, recently developed by the authors, is a new approach for obtaining minimum in-situ stress, reservoir pressure, and well productivity index estimates in a fraction of the time required by conventional DFITs. The goal of this study is to demonstrate the application of DFIT-FBA to hydraulic fracturing design and reservoir characterization by performing tests at multiple points along a horizontal well completed in an unconventional reservoir. Furthermore, new corrections are introduced to the DFIT-FBA method to account for perforation friction, tortuosity, and wellbore unloading during the flowback stage of the test. The time and cost efficiency associated with the DFIT-FBA method provides an opportunity to conduct multiple field tests without delaying the completion program. Several trials of the new method were performed for this study. These trials demonstrate application of the DFIT-FBA for testing multiple points along the lateral of a horizontal well (toe stage and additional clusters). The operational procedure for each DFIT-FBA test consists of two steps: 1) injection to initiate and propagate a mini hydraulic fracture and 2) flowback of the injected fluid on surface using a variable choke setting on the wellhead. Rate transient analysis methods are then applied to the flowback data to identify flow regimes and estimate closure and reservoir pressure. Flowing material balance analysis is used to estimate the well productivity index for studied reservoir intervals. Minimum in-situ stress, pore pressure and well productivity index estimates were successfully obtained for all the field trials and validated by comparison against a conventional DFIT. The new corrections for friction and wellbore unloading improved the accuracy of the closure and reservoir pressures by 4%. Furthermore, the results of flowing material balance analysis show that wellbore unloading might cause significant over-estimation of the well productivity index. Considerable variation in well productivity index was observed from the toe stage to the heel stage (along the lateral) for the studied well. This variation has significant implications for hydraulic fracture design optimization, particularly treatment pressures and volumes.

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