Productivity of Multiple Drainholes or Fractured Horizontal Wells

Raghavan, R.; Joshi, S.D.

doi:10.2118/21263-pa

Cited by 69 publications

(20 citation statements)

References 19 publications

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“…With the advent of new technology, multilateral or multibranched wells are also being drilled. Fluid flow behavior into these nonvertical wells has been also investigated and IPR equations have been presented by several authors (Bendakhlia and Aziz, 1989;Cheng, 1990;Kabir, 1992;Chang, 1992;Raghavan and Joshi, 1993;Huang et al, 1998;Retnanto and Economides, 1996;Kamkom and Zhu, 2005;Yildiz, 2005;Guo et al, 2006). Qasem (1996) presented a detailed study of IPR for naturally fractured reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Modeling Inflow Performance Relationships for Wells Producing From Two-Layer Solution-Gas Drive Reservoirs Without Cross-Flow

Qasem

Nashawi

Malallah

et al. 2012

Petroleum Science and Technology

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Continuous monitoring and accurate anticipation of the present and future performance of the flowing wells and reservoirs constitute the cornerstone elements in the design of optimum field development strategy. It is crucial for the petroleum engineer to possess the appropriate tools that assist in efficiently predicting well behavior, designing artificial lift equipment, forecasting production, and optimizing the entire production system. Inflow performance relationship (IPR) is one of the vital tools required to monitor well performance. Existing inflow performance relationship models are idealistic and mainly designed for homogeneous reservoirs. However, most reservoirs around the world are heterogeneous and composed of layers of different permeabilities. Hence, there is an urgent need for new realistic IPR models that describe the actual reservoir inflow performance behavior more efficiently than the available models. The authors investigate the effects of reservoir heterogeneity on IPR curves for wells producing from two-layer solution-gas drive reservoirs without cross-flow. Furthermore, the results provide the petroleum engineer with two simple yet accurate IPR models for heterogeneous reservoirs. The first model represents the IPR of the well under present flowing conditions, while the second model is used to forecast future well deliverability.

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Section: Introductionmentioning

confidence: 99%

Modeling Inflow Performance Relationships for Wells Producing From Two-Layer Solution-Gas Drive Reservoirs Without Cross-Flow

Qasem

Nashawi

Malallah

et al. 2012

Petroleum Science and Technology

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“…Mathematical models for multilateral well productivity prediction have been presented and modified [5][6][7][8][9][10], and parameters for the optimization of complex structure wells have been studied [11][12][13].…”

Section: Theoretical Researchmentioning

confidence: 99%

Experimental and Simulation Study of Complex Structure Well Pattern Optimization for Buried Hill Fractured Reservoirs

Liu

Ji-chang

et al. 2014

Arab J Sci Eng

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The use of a vertical well pattern results in productivity deficiency and poor development effect when developing buried hill reservoirs with complex properties. In this work, experiments are conducted to determine the best pattern for complex structure wells in buried hill reservoirs. Discretization is employed in an experimental method that uses unit cubic rocks with a size of 5 cm × 5 cm × 5 cm. The rocks are bonded in a spotty or reticular design to form a macroscopic model. Based on water flooding similarity criteria of fractured reservoir, an experimental model similar to a quarter of a five-spot unit in an actual reservoir is designed and manufactured. By selectively plugging wells in the model, various well patterns are established. Simulation results indicate that the vertical-vertical well pattern exhibits the fastest water breakthrough, fastest increase in water cut, and lowest recovery under the same pressure difference and well spacing. The horizontal-horizontal well pattern has the slowest water cut increase and the highest final oil recovery. For fishbone wells, this pattern facilitates an ideal development effect when the percolation direction is perpendicular to the plane determined by the mother bore and branch. When liquid rate, water cut, and recovery are considered, the horizontal-horizontal well pattern is recommended when conditions allow.

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“…The mechanism of fluid flow in a horizontal well with hydraulic fractures was also discussed in their work (14). Raghavan & Joshi (1993) estimated productivity increase of multiple fractures intercepting a horizontal well. Laplacetransformed, semi-analytical solutions for the pressure transient behavior of finite conductivity fractures in horizontal wells for transverse and longitudinal fractures were presented (8).…”

Section: Introductionmentioning

confidence: 99%

Productivity Increase Estimation for Multi Stage Fracturing in Horizontal Wells for Tight Oil Reservoirs

2015

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Hydraulic fracturing is widely used to exploit the tight and low permeability oil and gas reservoirs. With recent technological advances, horizontal wells, along with Multi Stage Fracturing (MSF) have come up with a great effective combined solution for tight reservoirs. The combined technologies overcome formation damage, increase reservoir contact, enhances productivity from fractures; hence make tight reservoirs development economical.On the other hand, drilling a horizontal well with placing multi stage fractures along its lateral is an expensive job. The feasibility of this job should be done to analyze the productivity enhancement provided by the Multi Stage Fracturing before commencing drilling operation. This work developed a simple, easy to use empirical correlation to calculate oil productivity enhancement in terms of fold of increase (FOI) for Pre-Frac analysis. In this paper, an approach has been put forward to evaluate the FOI in Multi Stage Fractured system for horizontal wells in the form of a correlation. The approach used is based on two 3-D simulation modelling scenarios; one with hydraulic fractures and the other without. The fracture case has been run for a wide range of parameters like number of fracture stages, formation permeability, fracture spacing, fracture conductivity and fracture half length, while the other case was run with changing formation permeability only, which served as the base case. The productivity index for both cases corresponding to same formation permeability was used to compute FOI for all different scenarios.A general empirical correlation for estimation of increase in oil productivity due to multi-stage fracturing in horizontal wells is derived through the use of multivariate regression. Correlation is obtained by 70% data points with the accuracy results of 5.20%, 0.54% and 7.79 Mean absolute percentage error, Mean percentage error and standard deviation respectively. The obtained correlation is tested against 30% of unused data points and found to generate acceptable results with 5.20%, 0.50% and 7.40 Mean absolute percentage error, Mean percentage error and standard deviation respectively.The developed correlation is accurate enough to capture even the minor changes in flow inside wellbore as well as interference between adjacent fracture stages. It will serve as a handy tool for pre analysis of fracture performance as compared to the costly and time consuming analytical or simulation models.

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Productivity of Multiple Drainholes or Fractured Horizontal Wells

Abstract: This paper provides guidelines to assess the productivity of horizontal-well completions by drilling multiple drainholes or by stimulation with vertical fractures. The paper also offers reliable methods to compute productivity gains for realistic conditions.

Cited by 69 publications

References 19 publications

Modeling Inflow Performance Relationships for Wells Producing From Two-Layer Solution-Gas Drive Reservoirs Without Cross-Flow

Modeling Inflow Performance Relationships for Wells Producing From Two-Layer Solution-Gas Drive Reservoirs Without Cross-Flow

Experimental and Simulation Study of Complex Structure Well Pattern Optimization for Buried Hill Fractured Reservoirs

Productivity Increase Estimation for Multi Stage Fracturing in Horizontal Wells for Tight Oil Reservoirs

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