Well test analysis of finite-conductivity fractured wells producing at constant bottomhole pressure

Nashawi, Ibrahim Sami; Malallah, Adel

doi:10.1016/j.petrol.2006.10.009

Cited by 12 publications

(7 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The pressure transient behavior of a single wellbore-intersecting fracture has been well studied, and many flow regimes have been discussed in the literature Samaniego-V, 1977, 1981a,b;Evans, 1971;Kuchuk andBiryukov, 2013, 2014;Lee and Brockenbrough, 1986;Raghavan, 1976;Soliman, 2009). The rate transient behavior of a single wellbore-intersecting fracture has also been studied (Guppy et al, 1981(Guppy et al, , 1988Nashawi and Malallah, 2007;Prats et al, 1962). Only Nashawi and Malallah (2007) have investigated the rate transient derivative behavior of a single fracture using published solutions for flow regimes.…”

Section: Wellbore-intersecting Single Fracturementioning

confidence: 99%

“…The rate transient behavior of a single wellbore-intersecting fracture has also been studied (Guppy et al, 1981(Guppy et al, , 1988Nashawi and Malallah, 2007;Prats et al, 1962). Only Nashawi and Malallah (2007) have investigated the rate transient derivative behavior of a single fracture using published solutions for flow regimes. One of the classic papers on elliptical flow in porous media by Prats et al (1962) presented the first solutions for transient behavior of an infinite-conductivity vertically fractured well produced at a constant pressure and constant rate in a closed elliptical reservoir.…”

Section: Wellbore-intersecting Single Fracturementioning

confidence: 99%

See 1 more Smart Citation

Rate Transient and Decline Curve Analyses for Continuously (Dual-Porosity) and Discretely Naturally Fractured Reservoirs

2014

View full text Add to dashboard Cite

Forecasting production rates and reserves is important for reservoir management. Analysis of long-term production data has traditionally been performed using the empirical Arps (1945) decline curves to predict future production. Fetkovich (1980) combined Arps decline curves with constant-wellbore pressure solutions to offer a new method for decline-curve analysis. Furthermore, both rate-transient and declinecurve analyses for naturally fractured reservoirs were performed using Arps (1945) decline curves or Warren and Root (1963) dual-porosity-type models. These approaches have yielded unsatisfactory results for naturally fractured reservoirs. Recent studies show that the Warren and Root (1963) dual-porosity-type models, which do not contain fractures, cannot characterize highly diverse transient behaviors of continuously and discretely fractured reservoirs because they are inappropriate and incomplete for most naturally fractured reservoirs. Furthermore, no investigation has been performed on rate-transient behavior of discretely fractured reservoirs.We investigate rate-transient behavior of continuously (dual-porosity) and discretely naturally fractured reservoirs using semianalytical solutions. These fractured reservoirs can contain periodically or arbitrarily distributed finite-and/or infinite-conductivity fractures, of different lengths and orientations. Our results demonstrate that, in terms of rate transients, neither continuously nor discretely fractured reservoirs behave like the Warren and Root (1963) dual-porosity type model. There are many factors that dominate the rate-transient behavior of naturally fractured reservoirs, such as fracture conductivities, dip angles, lengths, and distributions, as well as whether or not fractures intersect the wellbore. Rate transients associated with these factors are shown for a few continuously and discretely fractured reservoirs with different well and fracture configurations.The inverse of the dimensionless pressure (p D ) is not a good approximation for the dimensionless rate (q D ), but for most cases, their derivatives behave similarly, and exhibit same or similar flow regimes. For some cases, they behave very differently. The similarities or variations are true for any type of reservoirs. For any reservoir, Arps' decline curves yield unreasonably high production rates and cumulative productions, except the exponential decline curve. The exponential decline curve should not be used without taking into account the change of the wellbore pressure as a function of time. Arps' decline curves analysis should not be used for both discretely and continuously fractured reservoirs. An integrated interpretation methodology is outlined for rate transient analysis in fractured reservoirs.A few examples for the rate transient behavior of the continuously and discretely fractured fractured reservoirs are presented. They exhibit different flow regimes depending on fracture distribution, intensity, and conductivity. We also compare the rate transient derivatives with pressure...

show abstract

Section: Wellbore-intersecting Single Fracturementioning

confidence: 99%

Section: Wellbore-intersecting Single Fracturementioning

confidence: 99%

Rate Transient and Decline Curve Analyses for Continuously (Dual-Porosity) and Discretely Naturally Fractured Reservoirs

2014

View full text Add to dashboard Cite

show abstract

“…This permits accurate modeling of the flow behavior during the fracture and formation linear-flow periods. The grid architecture used in this study is identical to those used by Morse and Von Gonten (1972), Agarwal et al (1979a,b), Bennett et al (1986), Settari et al (2000), Nashawi (2006), and Nashawi and Malallah (2007). Fig.…”

Section: Description Of the Simulation Modelmentioning

confidence: 99%

Pressure-transient analysis of infinite-conductivity fractured gas wells producing at high-flow rates

Nashawi¹

2008

Journal of Petroleum Science and Engineering

Self Cite

View full text Add to dashboard Cite

“…It is worth mentioning that constant-pressure tests have the advantage of minimizing changes in the wellbore storage coefficient (Earlougher Jr., 1977). The wellbore storage effects distort earlytime pressure evolution, subsequently, the constant-pressure well tests allow the analysis of early-time data and in this way information of the reservoir in the vicinity of the wellbore can be obtained (Nashawi and Malallah, 2007). Moreover, ratetransient tests are particularly suitable for the illustration of the long-term behavior of formations (Torcuk et al, 2013).…”

mentioning

confidence: 99%

“…Follow-up investigations conducted by Nashawi (2006) presented semi-analytical solutions when considering non-Darcy flow in a fracture and a method with which it is possible to quantify the turbulence in a fracture. Nashawi and Malallah (2007) developed a direct method to determine the fracture and reservoir parameters without having to use type-curve matching techniques. In this context, Heidari Sureshjani and Clarkson (2015) concluded that plotting techniques overestimate the fracture half-length, leading them to the formulation of an analytical methodology with which it is estimated more precisely.…”

mentioning

confidence: 99%

Bilinear pressure diffusion and termination of bilinear flow in a vertically fractured well injecting at constant pressure

D.¹,

R.²,

Rioseco³

2020

Preprint

View full text Add to dashboard Cite

Abstract. This work studies intensively the flow in fractures with finite hydraulic conductivity intersected by a well injecting/producing at constant pressure. Previous investigations showed that for a certain time the reciprocal of flow rate is proportional to the fourth root of time, which is characteristic of the flow regime known as bilinear flow. Using a 2D numerical model, we demonstrated that during the bilinear flow regime the transient propagation of isobars along the fracture is proportional to the fourth root of time. Moreover, we present relations to calculate the termination time of bilinear flow under constant injection or production well pressure, as well as, an expression for the bilinear hydraulic diffusivity of fractures with finite hydraulic conductivity. To determine the termination of bilinear flow regime, two different methods were used: (a) numerically measuring the transient of flow rate in the well and (b) analyzing the propagation of isobars along the fracture. Numerical results show that for low fracture conductivities the transition from bilinear flow to another flow regime occurs before the pressure front reaches the fracture tip and for high fracture conductivities it occurs when the pressure front arrives at the fracture tip. Hence, this work complements and advances previous research on the interpretation and evaluation of well test analysis under different reservoir conditions. Our results aim at improving the understanding of the hydraulic diffusion in fractured geologic media and as a result they can be utilized for the interpretation of hydraulic tests, for example to estimate the fracture length.

show abstract

Well test analysis of finite-conductivity fractured wells producing at constant bottomhole pressure

Cited by 12 publications

References 43 publications

Rate Transient and Decline Curve Analyses for Continuously (Dual-Porosity) and Discretely Naturally Fractured Reservoirs

Rate Transient and Decline Curve Analyses for Continuously (Dual-Porosity) and Discretely Naturally Fractured Reservoirs

Pressure-transient analysis of infinite-conductivity fractured gas wells producing at high-flow rates

Bilinear pressure diffusion and termination of bilinear flow in a vertically fractured well injecting at constant pressure

Contact Info

Product

Resources

About