A Fast Simulation Tool for Evaluation of Novel Well Stimulation Techniques for Tight Gas Reservoirs

Egberts, P.J.P.; Peters, E.

doi:10.2118/174289-ms

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…( 1), η ¼ k φμc t is the diffusivity coefficient. Similarly as the steady state pressure solution for RJD wells was derived in Egberts and Peters [24], we will construct a solution for the pressure field from 3D point source solutions exploiting the principle of superposition [25]. One may derive a transient point source solution solving Eq.…”

Section: Single Porositymentioning

confidence: 99%

“…Here q p (m3/s) is the continuous rate at a point source location x ′ , e p D the pressure solution at a point x and r D = ‖x − x ′ ‖/r w with ‖•‖ the Euclidian norm. In a similar fashion as the steady state solution is constructed for an RJD well, in Egberts and Peters [24] the well is split up in a number of linear segments and for each segment a line source solution is derived through integration of point source solutions (Eq. ( 5)) along the segment, thereby allowing for a polynomial varying flux q along the segment.…”

Section: Single Porositymentioning

confidence: 99%

“…1 Illustration of an RJD well configuration Computational Geosciences analytic approach that is used is the Analytical Element Method (AEM). The AEM is used in [24] for steady state performance calculations for an RJD well and is extended in the present work to a transient solution. An advantage of the followed approach is that it allows for including wellbore storage and naturally extends to dual porosity reservoirs.…”

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confidence: 99%

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Well testing of radial jet drilling wells in geothermal reservoirs

Egberts

Peters

2022

Comput Geosci

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Radial Jet Drilling (RJD) is a stimulation technique to increase a well’s performance through creation of multiple laterals of up to 100 m long. The technique has been used in the petroleum industry for several years and recently also for geothermal reservoirs. Interpretation of well tests of a well with multiple laterals may become problematic if the effect of the laterals is not correctly modelled. In this work it is investigated what the impact of RJD laterals is on the pressure transients for both single and dual porosity reservoirs. A semi-analytic model for the calculation of the transient well pressure that accounts explicitly for the RJD well geometry is developed and validated with a detailed numerical simulation. The results show that changes in the lateral configuration affect the pressure transients significantly. In particular for single porosity media, the laterals affect the pressure transients in ways that cannot be captured by representing the stimulation by a skin factor. Since the RJD process is unsteered and the exact configuration of the laterals uncertain, the model may potentially assist in estimating the effectiveness of the stimulation such as the achieved reach of the laterals. Although the work was carried out in the context of RJD application in geothermal reservoirs, the presented model approach can be extended to multi-lateral wells in oil or gas reservoirs.

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Section: Single Porositymentioning

confidence: 99%

Section: Single Porositymentioning

confidence: 99%

mentioning

confidence: 99%

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Well testing of radial jet drilling wells in geothermal reservoirs

Egberts

Peters

2022

Comput Geosci

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“…the Productivity Index that relates drawdown to production rate). The semi-analytic method is based on the AEM (Analytic Element Method) (see Egberts et al, 2013, andPeters, 2015, for a more in-depth explanation of the method).…”

Section: Introductionmentioning

confidence: 99%

Modelling of multi-lateral well geometries for geothermal applications

et al. 2018

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Abstract. Well inflow modelling in different numerical simulation approaches are compared for a multi-lateral well. Specifically radial wells will be investigated, which can be created using Radial Jet Drilling (RJD). In this technique, powerful hydraulic jets are used to create small diameter laterals (25–50 mm) of limited length (up to 100 m) from a well. The laterals, also called radials, leave the backbone at a 90∘ angle. In this study we compare three numerical simulators and a semi-analytical tool for calculating inflow of a radial well. The numerical simulators are FE approaches (CSMP and GOLEM) and an FV approach with explicit well model (Eclipse®). A series of increasingly complex well configurations is simulated, including one with inflow from a fault. Although all simulators generally are reasonably close in terms of the total well flow (deviations < 4 % for the homogeneous cases), the distribution of the flow over the different parts of the well can vary significantly. Also, the FE approaches are more sensitive to grid size when the flow is dominated by radial flow to the well since they do not include a dedicated well model. In the FE approaches, lower dimensional elements (1-D for the well and 2-D for the faults) were superimposed into a 3-D space. In case the flow is dominated by fracture flow, the results from the FV approach in Eclipse deviates from the FE methods.

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A coupling flow model for fractured horizontal well and anisotropic tight gas reservoir

Lian

Duan

et al. 2021

J Petrol Explor Prod Technol

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The development of multistage fracturing technology in horizontal wells is a great impulsion to the successful development of unconventional resources. The hydraulic fractures distribute regularly along the horizontal wellbore, forming a seepage channel for fluids in tight gas reservoir and greatly improving the productivity of horizontal wells. Based on Green function and Neumann product principle, we establish a flow model of fractured horizontal well coupled with anisotropic tight gas reservoir under both unsteady state and pseudo-steady state and propose a method to solve this model. The calculation results show that flow rate of horizontal well under the early unsteady state is larger than that under the pseudo-steady state. There is no interference among fractures in the early unsteady state, and flow rate is in direct proportion to fracture numbers. Affected by frictional and acceleration pressure drop, flow rate of the end fractures is obviously larger than other fractures in pseudo-steady state. The permeabilities in different directions have great influence on well flow rate distribution. With the increasing Kx, the interference between the fractures is reduced, and the flow distribution is more balanced. When Ky becomes larger, the interference between fractures are stronger, and the “U” shape distribution of the wellbore flow is more significant.

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A Fast Simulation Tool for Evaluation of Novel Well Stimulation Techniques for Tight Gas Reservoirs

Cited by 5 publications

References 7 publications

Well testing of radial jet drilling wells in geothermal reservoirs

Well testing of radial jet drilling wells in geothermal reservoirs

Modelling of multi-lateral well geometries for geothermal applications

A coupling flow model for fractured horizontal well and anisotropic tight gas reservoir

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