Three dimensional pressure transient behavior study in stress sensitive reservoirs

Moradi, Mostafa; Shamloo, Amir; Asadbegi, Mohsen; Daneh-Dezfuli, Alireza

doi:10.1016/j.petrol.2017.02.017

Cited by 16 publications

(7 citation statements)

References 23 publications

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“…The mathematical model presented in [27] and based on pressure build-up curves makes it possible to predict the change in the permeability during the hydrocarbon production. The authors in [28][29][30][31][32][33] also study the nature of changes in fluid filtration in a reservoir as a result of changes in effective pressure and permeability and its relationship with the results of pressure build-ups. In these works, the same approach was used, although the method used is universal but it does not take into account the reservoir properties, the values of the coefficients in the equations are individual for each rock and, possibly, depend on its properties, therefore, additional research is needed in order for this method to be used for predicting permeability of formations with different properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Effective Pressure on the Permeability of Rocks Based on Well Testing Results

et al. 2021

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During the development of oil and gas fields, the permeability of the reservoirs decreases due to a decrease in reservoir pressure and an increase in effective pressure, as a result of which significant reserves of oil and gas remain in the reservoir. To predict the rate of decrease in oil production rates during field development and to respond quickly, it is necessary to know the law of permeability decrease with an increase in effective pressure. Existing methods for describing the change in the permeability of rocks were analyzed in the paper. Numerical analysis of the results of core studies from previously published papers and the results of field well testing on the examples of the north Perm region oil fields showed that in both cases, regardless of the type of rock and the type of reservoir, the change in permeability can be described by the same equations (exponential and power-law). Obtained equations can be used to predict changes in the permeability of terrigenous reservoirs of the north Perm region oil fields. At the same time, according to the results of well testing, an intensive decrease in permeability is observed with an increase in effective pressure. Analysis of the nature of permeability changes using the Two-Part Hooke’s Model showed that significant irreversible deformations are currently taking place in the formations of the oil fields under consideration. Predicting the change in permeability from effective pressure can allow to optimize the development of oil deposits.

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Section: Introductionmentioning

confidence: 99%

Effect of Effective Pressure on the Permeability of Rocks Based on Well Testing Results

et al. 2021

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“…The authors in [33][34][35][36][37] also studied the change in fluid filtration in a reservoir as a result of changes in effective pressure and permeability, as well as how this was related with results of pressure build-ups. However, the study was also performed under ideal reservoir conditions.…”

Section: Introductionmentioning

confidence: 99%

“…It is also worth noting that in works [29][30][31][32][33][34][35][36][37], as in many other works, the main attention is paid to the study of changes in the pressure build-up curves of a stress-sensitive formation. These studies show how permeability changes from pressure in situ and the results of historical observations during production are not presented.…”

Section: Introductionmentioning

confidence: 99%

A Model of Reservoir Permeability Evolution during Oil Production

2021

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In this paper, we present a mathematical model to predict the evolution of rock permeability depending on effective pressure during oil production. The model is based on the use of the results of well testing data from wells operating in the oil fields of the Perm–Solikamsk region in the north of the Volgo Ural oil and gas province. Dependences of the change in flow characteristics in the reservoir on the effective pressure were established. We performed a comparative assessment using permeability and effective pressure data that were normalized to dimensionless forms of k/ko and P/Po. The factors and their influence on the nature of the change in permeability from the reservoir pressure were determined. Depending on the type of rock, its composition, initial permeability, and bedding conditions, we determined the limits of variation of the constants in empirical equations describing the change in the permeability of rocks from the effective pressure. The mathematical model we developed enables the prediction of the change in permeability of rocks during oil production from reservoirs on the basis of reservoir properties such as initial permeability, initial reservoir pressure, average bedding depth, net-to-gross ratio, and initial effective rock pressure.

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“…Under the influence of tectonism and diagenesis, natural fractures are often developed in various reservoirs, which are referred to as fractured-porous reservoirs, including sandstone fractured reservoirs, glacier fractured reservoirs, carbonate fractured reservoirs, and igneous fractured reservoirs [1,2]. Fractured-porous reservoirs often show a degree of stress sensitivity during depletion development, leading to a decrease in reservoir permeability and well productivity [3][4][5]. Accurate evaluation of stress sensitivity and its influence on well productivity is of great significance to optimize the well working system in these kinds of reservoirs and thus can improve oil recovery and save production cost at the same time.…”

Section: Introductionmentioning

confidence: 99%

Inflow Performance Analysis of a Horizontal Well Coupling Stress Sensitivity and Reservoir Pressure Change in a Fractured-Porous Reservoir

Wang¹,

Fan

Zhao

et al. 2021

Lithosphere

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Stress sensitivity has always been a research hotspot in fractured-porous reservoirs and shows huge impacts on well productivity during the depletion development. Due to the continuous reservoir pressure change, accurate evaluation of stress sensitivity and its influence on well productivity is of great significance to optimize well working system. Taking horizontal well trajectory as the research object, the principal focus of this work is on the analysis of inflow performance for a horizontal well coupling stress sensitivity and reservoir pressure change in a fractured-porous reservoir. Firstly, a relationship between permeability damage rate and stress sensitivity coefficient was established to quantitatively evaluate the influence of reservoir pressure and stress sensitivity on reservoir permeability. Secondly, considering stress sensitivity and reservoir pressure drop, a set of practical productivity equations were derived for a horizontal well in a fractured-porous reservoir by adopting the equivalent seepage resistance method. Finally, the influence of relevant important factors on the inflow performance of horizontal wells was discussed in depth. Results show that a positive correlation exists between stress sensitivity coefficient and maximum permeability damage rate. At the same maximum permeability damage rate, high initial reservoir pressure corresponds to low stress sensitivity coefficient. In general, stress sensitivity coefficient mainly ranges from 0 to 0.2. Reservoir pressure change drastically affects the production dynamic characteristics of horizontal wells, and both the inflow performance curve and the production index curve decline and shrink as reservoir pressure decreases. Stress sensitivity is negatively correlated with horizontal well productivity, and the inflow performance/production index curve bends closer to bottom-hole pressure axis, and an inflection point can be observed with the aggravation of stress sensitivity. In addition, horizontal wellbore length and initial reservoir permeability also show significant effects on the inflow performance and are positively correlated with well productivity. For water cut, it has little effect on the well production when bottom-hole pressure drawdown is low, but its effect gets stronger as the drawdown becomes higher. Meaningfully, depending on these newly established productivity equations, a reasonable production system can be quantitatively optimized and achieved for the horizontal wells in fractured-porous reservoirs.

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Three dimensional pressure transient behavior study in stress sensitive reservoirs

Cited by 16 publications

References 23 publications

Effect of Effective Pressure on the Permeability of Rocks Based on Well Testing Results

Effect of Effective Pressure on the Permeability of Rocks Based on Well Testing Results

A Model of Reservoir Permeability Evolution during Oil Production

Inflow Performance Analysis of a Horizontal Well Coupling Stress Sensitivity and Reservoir Pressure Change in a Fractured-Porous Reservoir

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