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Experimental and modeling study of CO_(2)-Improved gas recovery in gas condensate reservoir

Petroleum 2017年第1期3卷 87-95页

作者： Zhengyuan Su Yong Tang Hongjiang Ruan Yang Wang Xiaoping Wei The State Key Laboratory of Oil&gas reservoir Geology and Exploitation Engineering Southwest Petroleum UniversityChengdu 610500PR China China National Offshore Oil Corp.Co.LTD.Zhanjiang Company PR China Changqing Oilfield Petro ChinaPR China

This paper presents the effectiveness of the CO_(2) injection process at different periods during gascondensate reservoir *** a real gas-condensate reservoir located in China's east region as an example,first,we conducted experiments of constant composition expansion(CCE),constant volume depletion(CVD),saturation pressure determination,and single ***,a series of water/CO2 flooding experiments were been investigated,including water flooding at present pressure 15 MPa,CO_(2) flooding at 25.53 MPa,15 MPa,which repents initial pressure and present pressure ***,the core flooding numerical model was constructed using a generalized equation-of-state model reservoir simulator(GEM)to reveal miscible flooding mechanism and the seepage flow characteristics in the condensate gas reservoir with CO2 injection.A desirable agreement achieved in experimental results and predicted pressure volume temperature(PVT)properties by the modified equation of state(EOS)in the CVD and CCE tests indicated that the proposed recombination method can successfully produce a fluid with the same phase behavior of initial reservoir fluid with an acceptable *** modeling results confirm the experimental results,and both methods indicate that significant productivity loss can occur in retrograde gas condensate reservoirs when the flowing bottom-hole pressure falls below dew point ***,the results show that CO_(2) treatment can improve gas productivity by a factor of about 1.39 compared with the water flooding *** results may help reservoir engineers and specialists to restore the lost productivity of gas condensate.

关键词： gas condensate reservoir CO_(2)injection Numerical simulations Improved gas recovery

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Economic Evaluation of Hydraulic Fracturing in a gas condensate reservoir Operating below Dewpoint

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Open Journal of Yangtze Oil and gas 2020年第3期5卷 73-86页

作者： Anthony Kerunwa Princewill O. Ariche Nkemakolam Chinedu Izuwa Federal University of Technology Owerri Nigeria

Hydraulic fracturing is among the approaches used to optimize production from a gas condensate reservoir. A detailed economic analysis is required to evaluate the profitability and feasibility of hydraulic fracturing as an optimization option in a gas condensate reservoir operating below dewpoint. The objective of this research is to evaluate the economic benefits derivable from the use of hydraulic fracturing to improve gas and liquid recovery from a gas condensate reservoir operating below dewpoint. This research considers the use of four profit indicators to ascertain the profitability of hydraulic fracturing in a gas condensate reservoir operating below dewpoint by increasing the fracture halflength, fracture width and fracture permeability. The production data of the reservoir was obtained and the economic calculations done on excel spreadsheet and plots generated. The four profit indicators considered in the research are Net Present Value, Payout, Discounted Cash Flow Rate of Return and Profit per Dollar Invested. The economic justification was done by carrying out a comparative economic analysis from the result obtained when the reservoir of study was unfractured with that obtained when the reservoir was fractured at various fracture parameters. The economic analysis was done considering a royalty and tax rate of 18.5% and 30% respectively and a gas price of $2/MSCF and condensate price of $30/bbl. This is done so as to find out if the additional cost of hydraulic fracturing can be offset by the recovery from the reservoir when its pressure declined below dewpoint. The result obtained showed that the additional recovery due to hydraulic fracturing by increasing the fracture halflength, fracture width and fracture permeability was not enough to justify the application of hydraulic fracturing when the reservoir pressure declined below dewpoint.

关键词： Economic Evaluation Fracture Halflength Proppants Profit Indicators Hydraulic Fracturing gas condensate reservoir Dewpoint

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A new model simulating the development of gas condensate reservoirs

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Energy Geoscience 2024年第1期5卷 239-248页

作者： Yang Yang Zengmin Lun Rui Wang Maolei Cui Wei Hu Petroleum Exploration and Production Research Institute SINOPECBeijing100083China

A new simulation model for the development of gas condensate reservoirs is introduced based on the influence that phase change,non-Darcy flow,and capillary pressure have on the production of gas *** model predicts well performance,including bottom-hole pressure,oil/gas production rate,oil/gas recovery,gaseoil ratio,and the change in produced fluid *** also calculates dynamic characters,such as the change of pressure field and oil/gas saturation field during the development of gas condensate *** model is applicable to different boundary conditions(both constant-pressure and sealed boundary)and different production modes(both constant-pressure and constant-volume production modes).Model validation attempted using numerical simulation results for sealed boundary conditions with constant-pressure production mode has shown a relatively good match,proving its *** constant-pressure boundary conditions with constant-volume production mode,four stages are defined according to the dynamic behavior of production performance in the development of gas condensate reservoirs.

关键词： gas condensate reservoir Phase behavior Numerical simulation Pseudo-pressure method

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Experimental Investigation on condensate Revaporization During gas Injection Development in Fractured gas condensate reservoirs

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哈尔滨工程大学学报（英文版） 2024年第3期23卷 575-582页

作者： Lei Zhang Yingxu He Jintao Wu Haojun Wu Lei Huang Linna Sun Bohai Oilfield Research Institute Tianjin Branch of CNOOCTianjin 300459China

The gas field in the Bohai Bay Basin is a fractured metamorphic buried-hill reservoir with dual-media characteristics. The retrograde vaporization mechanism observed in this type of gas condensate reservoir differs significantly from that observed in sand gas condensate reservoirs. However, studies on improving the recovery of fractured gas condensate reservoirs are limited;thus, the impact of retrograde vaporization on condensate within fractured metamorphic buried-hill reservoirs remains unclear. To address this gap, a series of gas injection experiments are conducted in pressure-volume-temperature(PVT) cells and long-cores to investigate the retrograde vaporization effect of condensate using different gas injection media in fractured gas condensate reservoirs. We analyze the variation in condensate volume, gas-to-oil ratio, and condensate recovery during gas injection and examine the influence of various gas injection media(CO_(2), N_(2), and dry gas) under different reservoir properties and varying gas injection times. The results demonstrate that the exchange of components between injected gas and condensate significantly influences condensate retrograde vaporization in the formation. Compared with dry gas injection and N_(2) injection,CO_(2) injection exhibits a superior retrograde vaporization effect. At a CO_(2) injection volume of 1 PV, the percentage shrinkage volume of condensate is 13.82%. Additionally, at the maximum retrograde condensation pressure, CO_(2) injection can increase the recovery of condensate by 22.4%. However, the condensate recovery is notably lower in fractured gas condensate reservoirs than in homogeneous reservoirs, owing to the creation of dominant gas channeling by fractures, which leads to decreased condensate recovery. Regarding gas injection timing, the effect of gas injection at reservoir pressure on improving condensate recovery is superior to that of gas injection at the maximum retrograde condensation pressure. This research

关键词： Buried-hill fractured reservoir gas condensate reservoir Retrograde condensation CO_(2)injection Retrograde vaporization

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gas condensate reservoirs: Characterization and calculation of dew-point pressure

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Petroleum Exploration and Development 2020年第5期47卷 1091-1102页

作者： ALAROUJ Mutlaq ALOMAIR Osamah ELSHARKAWY Adel Petroleum Engineering Department College of Engineering&PetroleumKuwait UniversityPO Box 5956Safat 13060Kuwait

A large data bank of more than 700 gas-condensate samples collected from literature and experiments was *** this basis,empirical correlations and equations of state commonly used to calculate dew-point pressure(DPP)were evaluated.A new model for estimating DPP was *** the empirical correlations and the Peng-Robinson state equation were compared,and sensitivity of parameters was *** current standards used to identify gas condensate were evaluated and found to be not accurate *** Peng-Robinson state equation has no unique solution and is affected by multiple factors such as the characterization of C7+components and the splitting *** Nemeth-Kennedy correlation has the highest accuracy when applied to the data bank established in this study,followed by Elsharkawy correlation and Godwin *** Shokir correlation cannot be used for samples without C7+components,it is therefore the lowest in *** newly proposed model has an average absolute error,root mean square error and coefficient of determination of 7.5%,588,and 0.87,respectively,and is better than the above four correlations *** proposed model proved to be more accurate and valid when compared to experimental results and simulation with the Peng-Robinson state equation.

关键词： gas condensate reservoir dew-point pressure empirical relation equation of state

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Efficient computation of the compositional model for gas condensate reservoirs

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Communications in Nonlinear Science and Numerical Simulation 2000年第4期5卷 141-146页

作者： Jifu ZHOU, Jiachun LI and Jigen YE (Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China The Research Institute of Petroleum Exploration and Development, Beijing 100083, China) (Received December 2, 2000) Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China Res. Inst. Petrol. Explor./Devmt. Beijing 100083 China

In this paper, a direct method, unsymmetric-pattern multifrontal factorization, for a large sparse system of linear equations is applied in the compositional reservoir model. The good performances of this approach are shown by solving the Poisson equation. And then the numerical module is embedded in the compositional model for simulating X15(3) gas condensate reservoir in KeKeYa gas field, Northwest China. The results of oil/gas reserves, variations of stratum pressure and oil/gas production, etc. are compared with the observation Good agreement comparable to COMP4 model is achieved, suggesting that the present model is both efficient and powerful in compositional reservoir simulations.

关键词： gas condensate reservoir compositional model sparse matrix

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