Correlation between per-well average dynamic reserves and initial absolute open flow potential (AOFP) for large gas fields in China and its application

Li, Xizhe; Liu, Xiaohua; Su, Yunhe; Guo-juan, WU; Liu, Huaxun; Lu, Lipeng; Wan, Yong; Guo, Zhenhua; Shi, Shi

doi:10.1016/s1876-3804(18)30111-3

Cited by 12 publications

(6 citation statements)

References 12 publications

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“…Through the above calculation results (Fig. 18), compared with the material balance method, the calculation result of the FMB method is generally small, with an average error of 33.95%; the error of the modified FMB method is small, with an average of 1.25% (Li et al, 2018). Therefore, it can be concluded that when there is a lack of measured pressure data, the calculation result of the modified FMB method is more accurate than that of the FMB method.…”

Section: Methods Verificationmentioning

confidence: 99%

Tight Gas Reservoir Dynamic Reserve Calculation with Modified Flowing Material Balance Method

He¹,

Guo²,

Cui³

et al. 2021

Preprint

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The determination of dynamic reserves of gas well is an important basis for rational production allocation and development of a single well. The commonly used flow material balance method (FMB method) uses the slope of the curve of wellhead pressure and cumulative production after stable production of gas well to replace the slope of the curve of average formation pressure and cumulative production to calculate the controlled reserves of single well. However, based on the theoretical calculation, the FMB method ignores the change of natural gas compression coefficient, viscosity and deviation coefficient in the production process. After considering these changes, the slope of the curve of the relationship between bottom hole pressure and cumulative production and the slope of the curve of the relationship between average formation pressure and cumulative production are not equal. In order to solve this problem, the influence of pressure on each parameter is considered, and the equation of modified flowing material balance method is derived. The application of Yan'an gas field in Ordos Basin shows that: compared with the results of the material balance method, the result of the flow material balance method is smaller, and the maximum error is 58.816%. The consequence of the modified mobile material balance method is more accurate, and the average error is 2.114%, which has good applicability. This study provides technical support for an accurate evaluation of dynamic reserves of tight gas wells in Yan'an gas field, and has important guiding significance for economic and efficient development of gas reservoir.

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Section: Methods Verificationmentioning

confidence: 99%

Tight Gas Reservoir Dynamic Reserve Calculation with Modified Flowing Material Balance Method

He¹,

Guo²,

Cui³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The absolute open flow potential of a gas well is defined as the maximum production rate by assuming the surface pressure at sand face (Li et al 2018;Sinha and Padgett 1985). This parameter is used to compare the potential of production of different wells and based on this parameter many decisions are taken, i.e., completion designing and selection, surface equipment designing and selection, gas sale agreements, etc.…”

Section: Validation and Applicationmentioning

confidence: 99%

“…The skin factor is also a basic parameter that shows variation from predicted pressure drop due to skin. This factor is analytically modeled using the calculated gas flow rates (Dong et al 2018;Li et al 2018Li et al , 2019b. So, the corrected gas flow rate by incorporating the TPG is also very useful to calculate the skin factor.…”

Section: Validation and Applicationmentioning

confidence: 99%

Tight gas production model considering TPG as a function of pore pressure, permeability and water saturation

Zafar

et al. 2020

Pet. Sci.

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Threshold pressure gradient has great importance in efficient tight gas field development as well as for research and laboratory experiments. This experimental study is carried out to investigate the threshold pressure gradient in detail. Experiments are carried out with and without back pressure so that the effect of pore pressure on threshold pressure gradient may be observed. The trend of increasing or decreasing the threshold pressure gradient is totally opposite in the cases of considering and not considering the pore pressure. The results demonstrate that the pore pressure of tight gas reservoirs has great influence on threshold pressure gradient. The effects of other parameters like permeability and water saturation, in the presence of pore pressure, on threshold pressure gradient are also examined which show that the threshold pressure gradient increases with either a decrease in permeability or an increase in water saturation. Two new correlations of threshold pressure gradient on the basis of pore pressure and permeability, and pore pressure and water saturation, are also introduced. Based on these equations, new models for tight gas production are proposed. The gas slip correction factor is also considered during derivation of this proposed tight gas production models. Inflow performance relationship curves based on these proposed models show that production rates and absolute open flow potential are always be overestimated while ignoring the threshold pressure gradients.

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“…Similarity Criteria. Tight sandstone gas reservoirs are characterized by low permeability, and there is basically no natural productivity, and only after large-scale fracturing transformation can they obtain gas productivity [36,37]. However, the gas can only flow effectively within the fracturing-affected area, and thus fracturing technology is widely used during the development to increase the discharge area of the gas well and increase productivity [38].…”

Section: Similarity Conversion Between Physical Experiments and Gas Well Productionmentioning

confidence: 99%

Experimental Study on the Effective Utilization of Reserves in Tight Sandstone Gas Reservoirs and Their Applications

et al. 2020

Self Cite

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The effective utilization of reserves in tight sandstone reservoirs is one of the major concerns in terms of the development of tight sandstone gas reservoirs. However, the characteristics of reserve utilization are not fully understood, and many uncertainties still exist in the process. For this purpose, long cores on the Su 6 block of Sulige tight sandstone gas field in China were selected, and a multipoint embedded measurement system was established to study the characteristics of effective reserve utilization. Then, the effects of the related reservoir properties and production parameters were investigated. Based on the similarity theory, the effective conversion relationship between the physical experiment and the actual field production was established. The results showed that the pressure distribution in the exploitation of tight gas reservoir is nonlinear, and water cut in the reservoir will hinder the effective utilization of reserves. The lower the reservoir permeability, the larger the negative effect of water on reservoir utilization. Lower gas production rate and higher original pressure are associated with a smoother drawdown curve, which results in larger reserve utilization. The moving boundary expands with time, and its initial propagation velocity increase and then decrease. Additionally, the water cut in the reservoir can delay the spread of moving boundary propagation. The experimental results are consistent with the actual results of the field production by the similarity criterion, which can reflect and predict the production performance in tight gas reservoirs effectively. These results can provide a better understanding of reservoir pressure distribution and effective utilization of reserves to optimize the gas recovery and development benefit in tight sandstone gas reservoirs.

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Correlation between per-well average dynamic reserves and initial absolute open flow potential (AOFP) for large gas fields in China and its application

Cited by 12 publications

References 12 publications

Tight Gas Reservoir Dynamic Reserve Calculation with Modified Flowing Material Balance Method

Tight Gas Reservoir Dynamic Reserve Calculation with Modified Flowing Material Balance Method

Tight gas production model considering TPG as a function of pore pressure, permeability and water saturation

Experimental Study on the Effective Utilization of Reserves in Tight Sandstone Gas Reservoirs and Their Applications

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