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Wells in gas condensate reservoirs usually exhibit complex behaviours due to condensate deposit as the bottomhole pressure drops below the dew point. The formation of this liquid saturation can lead to a severe loss of well productivity and therefore lower gas recovery. A similar behaviour is observed in volatile oil reservoirs below the bubble point. Understanding these behaviours and extracting values of controlling parameters is necessary to evaluate well potential and design effective programmes to improve productivity.

Our work to-date, in Phases I and II of the JIP, has focused on vertical and horizontal wells in sandstone reservoirs and has led to a better understanding of near-wellbore effects in gas condensate and volatile oil reservoirs from well testing.

Although a large body of knowledge has been acquired through our research in the last seven years, significant challenges remain in the analysis of well tests in gas condensate reservoirs below the dew point pressure, and of well tests in volatile oil reservoirs below the bubble point pressure. These are addressed in the current Phase III of the JIP, which includes:

  1. Completing the work initiated during Phase 2
  2. Applying deconvolution to the analysis of gas condensate and volatile oil well test data
  3. Developing methods for predicting and improving well productivity and evaluating the effectiveness of different remediation solutions

Gas Condensates figure 2 Gas Condensates figure 1

Publications

SPE number Title Yearsort descending
SPE62920 Well Test Analysis in Gas-Condensate Reservoirs 2000
SPE89904 New Estimate for the Radius of a Condensate Bank from Well Test Data Using Dry Gas Pseudo-Pressure 2004
SPE89905 Well Test Analysis of Horizontal Wells in Gas-Condensate Reservoirs 2004
SPE89911 Estimates for the Growth of a Condensate Bank from a Simple Compositional Model 2004
SPE94178 Comparison of Well Productivity between Vertical, Horizontal and Hydraulically Fractured Wells 2004
SPE93136 Productivity Assessment of Fractured and Non-Fractured Wells in a Lean/Intermediate Low Permeability Gas Condensate Reservoir 2005
SPE94018 Estimating Gas Condensate Well Productivity Controlling Parameters from Transient Pressure Data 2005
SPE96587 Experimental Investigation of Wellbore Phase Redistribution Effects on Pressure-Transient Data 2005
SPE100250 Integration of Well Test Deconvolution Analysis and Detailed Reservoir Modelling in 3D Seismic Data Interpretation: A Case Study 2006
SPE100993 Well Test Analysis in Lean Gas Condensate Reservoirs: Theory and Practice 2006
SPE118377 Application of Well Testing for Well Deliverability Forecasting in Volatile Oil Reservoirs 2008
SPE116239 Well Test Analysis in Volatile Oil Reservoirs 2008
SPE0 An experimental study of wellbore phase redistribution effects in gas condensate reservoirs (4th International Conference on Multiphase Production Technology, Cannes, France 17-19 June 2009) 2009
SPE121326 Predicting when condensate accumulation near the wellbore in a gas condensate reservoir can be identified from a build up 2009
SPE121848 Well Test Dynamics in Rich Gas Condensate Reservoirs Under Gas Injection 2009
SPE134452 Comparative Well-Test Behaviours in Low-Permeability Lean, Medium-rich, and Rich Gas-Condensate Reservoirs 2010

PhD Theses

Title Author Yearsort descending
New Developments In Well Test Analysis Saifon Daungkaew 2001
Characterisation and Determination of Gas Condensate Dynamics from Pressure Transient Data and Fluid PVT Properties Manijeh Bozorgzadeh 2006
Evaluation of Horizontal Gas-Condensate Wells Using Pressure Transient Analysis and Compositional Simulation Abdolnabi Hashemi 2006
Modelling Of Flows In Vertical Pipes And Its Application To Multiphase Flow Metering At High Gas Content And To The Prediction Of Well Performance Gioia Falcone 2006
Well Test Analysis in Volatile Oil Reservoirs Moshood Olajide Sanni 2008
Well Test Dynamics of Rich Gas Condensate Reservoirs Olalekan A. Aluko 2009

MSc Theses

Title Author Yearsort descending
Well Test Analysis in Gas Condensate Reservoirs Jiradej Tanapatchaipong 2001
Well Test Interpretation of Formation Tester Data of Gas Condensate Reservoir Binayak Agarwal 2001
Composite Behaviour In Multi-Layered Reservoirs George Mykoniatis 2001
Wellbore Dynamics in Gas Condensate Wells Akemu, Akpeki Onajomo 2001
The Applicability Of Timely Gas Injection In Gas Condensate Fields To Improve Well Productivity Daniel Leseja Marokane 2001
Evaluation of the potential of well 30/7A-P1 in the Judy field Manijeh Bozorgzadeh 2001
High Pressure High Temperature Well Test Interpretation Jade Field, UKCNS Abdolnabi Hashemi 2001
Well Test Analysis of a North Sea Gas Condensate Reservoir Olalekan Aluko 2002
Prediction of Highly Volatile Oil Reservoir Performance Below the Bubble Point Pressure Abdimurat Ayapbergenov 2002
A Feasibility Study of Horizontal Wells in the Development of a Carbonate Reservoir Oil Rim - Comparative Sensitivities Using a Sector Model Clare Siobhan Howat 2002
Well Test Analysis In A Volatile Oil Reservoir In Algeria Arsyad A. Siregar 2003
Well test analysis in the Hassi R’Mel field, Algeria Piyatad Tabmanee 2003
Productivity Assessment Of Fractured And Non-Fractured Gas Condensate Wells Mirza Tarik Ali Baig 2003
Well Test Analysis In A Dual Porosity Gas-Condensate Reservoir Bandar H. Al-Malki 2004
Simulation Of Well Test In Volatile Oil Reservoir Sanni Moshood Olajide 2004
Experimental Investigation of Wellbore Phase Redistribution Effect on Pressure Transient Data Ahmed Moge Ali 2004
Comparison Of Different Methods For Estimating Gas Condensate Well Deliverability Bernard P. Sinambela 2005
Evaluation Of Reservoir Heterogeneities For Modelling Gas Injection In A Retrograde Gas Condensate Reservoir Sabina Rattan 2005
Deconvolution Analysis of a Horizontal Gas Condensate Well Thabo Clifford Kgogo 2005
Composite well test interpretation model for horizontal wells Nicolas Guézé 2005
Volatile Oil Well Testing ‘Best Practice’ and Productivity Enhancement in the MLNW Field, Algeria Aisha Alfa-Wali 2005
Pentland Re-development Plan: Predicting the Effects of Condensate Banking in a North Sea HPHT Gas-Condensate Reservoir Babalola Abiose Daramola 2005
Well Test Behaviour in Multi-Layer Gas-Condensate Reservoirs Perapon Fakcharoenphol 2006
Use of Deconvolution to Improve the Reservoir Behaviour Understanding of Some Gas Condensate Reservoirs in Britannia Jean-Baptiste Berchoteau 2006
Well Test & Deconvolution Analyses of Gas Condensate Reservoirs Olivier Pippi 2006
Predicting the Onset of the Effect of Condensate Accumulation in the Build-Up Pressure Derivative Plot George Krukrubo 2007
Well Tests In Naturally Fractured Gas-Condensate Reservoirs Hammed A. Shittu 2007
Evaluation of Confidence Intervals in Well test Interpretation Results Ali Cherif Azi 2007
Effects of Material Balance on Well Test Analysis Amit Madahar 2007
Prediction of the production performance of a Gas Condensate Well in the North Sea: A Simulation Study Luther Sullivan 2007
Modeling of Near Wellbore Flow Effects in Gas Condensate Reservoirs Nur Suut 2007
Simulation Of Possible Gas Condensate Banking Ulan Burkitov 2008
Estimating Storativity Ratio In Wells Producing Volatile Oil Sola Makinde 2008
Well Test Analysis In Naturally Fractured Gas Condensate Reservoirs Below Dew Point Pressure Ahmed Albaqawi 2008
Use of Black Oil Models for Complex Reservoir Fluids Adnan Merchant 2008
Experimental Study of Wellbore Dynamics in Gas Condensates Sohaib M. Mirza 2008
Experimental Study of Wellbore Dynamics in Gas Condensates Morounranti Vigo 2009
Evaluating the Wellbore Skin versus Rate Relationship in Gas Condensate and Volatile Oil Reservoirs Gadilbek Uxukbayev 2009