Permeabilities and Skins in Naturally Fractured Reservoirs: An Overview and an Update for Wells at Any Deviation

Liétard, Olivier

doi:10.2118/54725-ms

Cited by 13 publications

(5 citation statements)

References 15 publications

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“…Giger [15] gives the productivity index (Q/ΔP) of a horizontal well in an oil reservoir (no permeability anisotropy): where: k = reservoir matrix permeability, mD h = payzone height, m µ = oil viscosity, cp B = formation volume factor, rb/stb r e = drainage radius, m r w = wellbore radius, m L = well length, m (L < r e ) q = production rate, stb/day ∆p = production drawdown pressure, pa Horizontal wells are of particular interest in naturally fractured reservoirs since the fracture planes typically are vertical (drilling horizontally maximizes the chances of intercepting the fractures) and the in-plane fracture conductivity is isotropic. Lietard [12] has verified the definition of the skin (s) and found it to be quite similar to the expression given by Renard and Dupuy [16]:…”

Section: Application Of the Approach For Ubd; The Impact Of Short Ovesupporting

confidence: 68%

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A Simple Analytical Approach to Simulate Underbalanced- drilling in Naturally Fractured Reservoirs—The Effect of Short Overbalanced Conditions and Time Effect

et al. 2010

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This paper describes an analytical approach to investigate the nature of short overbalanced conditions and time effects during underbalanced drilling (UBD) in a naturally fractured reservoir. This study uses an analytical model which is developed for kinetic invasion of mud into the fractures. The model is based on fluid flow between two parallel plates, which is further extended to model the fluid flow in a fractured formation. The effect of short overbalanced pressure and the time effect during UBD as well as the aspects of well productivity and flow efficiency are explained. This model is an Excel-based program and provides a fast and convenient tool for analysis and evaluation of drilling conditions (mud properties, time, and pressure of drilling) in a fractured formation. The model can also predict the impact of the fracture and mud properties on the depth of invasion in the fractured formations.

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Section: Application Of the Approach For Ubd; The Impact Of Short Ovesupporting

confidence: 68%

“…By use of dimensionless analysis the ordinary differential equation is simplified as follows (Lietard et al, [12]) , expressing the dimensionless mud-invasion radius r D with respect to the dimensionless time t D :…”

Section: Modeling Of Invasion In a Fractured Reservoirmentioning

confidence: 99%

A Simple Analytical Approach to Simulate Underbalanced- drilling in Naturally Fractured Reservoirs—The Effect of Short Overbalanced Conditions and Time Effect

et al. 2010

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“…The interpretation led to assessing the transmissivity value before the stimulation process (kh = 84 mD m). Negative skin is observed (S = −3.68), which is coherent with a well connected to a pattern of natural fractures (Lietard, 1999).…”

Section: Baseline Test: Injection 2 and Hpt-1supporting

confidence: 64%

Harmonic Pulse Testing for Well Monitoring: Application to a Fractured Geothermal Reservoir

Borello

Fokker

Viberti

et al. 2019

Water Resources Research

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Harmonic Pulse Testing (HPT) has been developed as a type of well testing applicable during ongoing field operations because a pulsed signal is superimposed on background pressure trend. Its purpose is to determine well and formation parameters such as wellbore storage, skin, permeability, and boundaries within the investigated volume. Compared to conventional well testing, HPT requires more time to investigate the same reservoir volume. The advantage is that it does not require the interruption of well and reservoir injection/production before and/or during the test because it allows the extraction of an interpretable periodic signal from measured pressure potentially affected by interference. This makes it an ideal monitoring tool. Interpretation is streamlined through diagnostic plots mimicking conventional well test interpretation methods. To this end, analytical solutions in the frequency domain are available. The methodology was applied to monitor stimulation operations performed at an Enhanced Geothermal System site in Pohang, Korea. The activities were divided into two steps: first, a preliminary sequence of tests, injection/fall-off, and two HPTs, characterized by low injection rates and dedicated to estimate permeability prior to stimulation operations, and then stimulation sequence characterized by a higher injection rate. During the stimulation operations other HPT were performed to monitor formation properties behavior. The interpretation of HPT data through the derivative approach implemented in the frequency domain provided reliable results in agreement with the injection test. Moreover, it provided an estimation of hydraulic properties without cessation of stimulation operations, thus confirming the effectiveness of HPT application for monitoring purposes.

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“…(9) On the basis of Eq. 9 and noting that (r s ) max >> r w , the maximum invasion radius (r s ) max is given by (Liétard 1999…”

Section: Drilling-mud Invasion Into Fracturesmentioning

confidence: 99%

“…11 through 14 into Eq. 9 yields a dimensionless ordinary-differential 17in which r Dmax is the maximum dimensionless mud-invasion radius, given by (Liétard 1999;Sawaryn 2001) Mud Loss and Type Curves Liétard et al (1999Liétard et al ( , 2002 first expressed Eq. 6 in dimensionless form by substituting Eqs.…”

Section: Drilling-mud Invasion Into Fracturesmentioning

confidence: 99%

Characterizing Natural-Fracture Permeability From Mud-Loss Data

2010

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Liétard et al. (1999, 2002) have provided important insight into the mechanism and prediction of transient-state radial mud invasion in the near-wellbore region. They provided type curves describing mud-loss volume vs. time that allow the hydraulic width of natural fractures to be estimated through a curve-matching technique. This paper describes a simpler and more direct method for estimating the hydraulic width by the solution of a cubic equation, with input parameters given by the well radius r w , the overpressure ratio ⌬p/ y , and the maximum mud loss volume (V m) max .

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Permeabilities and Skins in Naturally Fractured Reservoirs: An Overview and an Update for Wells at Any Deviation

Abstract: This paper was prepared for presentation at the 1999 SPE European Formation Damage Conference held in The Hague, The Netherlands, 31 May–1 June 1999.

Cited by 13 publications

References 15 publications

A Simple Analytical Approach to Simulate Underbalanced- drilling in Naturally Fractured Reservoirs—The Effect of Short Overbalanced Conditions and Time Effect

A Simple Analytical Approach to Simulate Underbalanced- drilling in Naturally Fractured Reservoirs—The Effect of Short Overbalanced Conditions and Time Effect

Harmonic Pulse Testing for Well Monitoring: Application to a Fractured Geothermal Reservoir

Characterizing Natural-Fracture Permeability From Mud-Loss Data

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