A General Approach to Well Evaluation

Diyashev, Iskander R.; Economides, Michael J.

doi:10.2118/94644-ms

Cited by 21 publications

(12 citation statements)

References 7 publications

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“…Economides, Demarchos et al [2][3] showed, for example, how relevant the mass of proppant is for the maximization of the productivity index. Diyashev and Economides 4 presented field case studies of almost a thousand hydraulic fracture treatments in Western Siberia, providing a very valuable experimental support for the UFD approach.…”

Section: Introductionmentioning

confidence: 99%

Economic and Physical Optimization of Hydraulic Fracturing

2008

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Optimization has taken several different hues in all areas of engineering. Hydraulic fracturing, as applied to petroleum wells, has had its share. In the past, and before the maturing of high-permeability fracturing and the tip screen out techniques, this well stimulation procedure was limited to low-permeability reservoirs and unrestricted fracturing. In such cases, the fracture length would be an appropriate design optimization variable against an economic criterion, e.g., the Net Present Value (NPV). This involved the balancing of incremental future revenue against the cost of execution. Also interesting are parametric studies, allowing the variation of execution variables and the detection of differences in their respective design NPV. Such differences would be useful in decisions to measure a variable or stay within reasonable assumptions. The emergence of higher-permeability fracturing and the Unified Fracture Design (UFD) concept allowed two important notions. First, there is no difference between low and high-permeability reservoirs in terms of benefiting for fracturing. Just execution issues need to be resolved. Second, and more important, for any mass of proppant to be injected in any well, there exists only one fracture geometry that would maximize production. This geometry, consisting of length and propped width (with height as a parasitic variable) can be readily determined and, if placed, it will provide the maximum productivity index. All other configurations would result in lower productivity values. This is physical optimization.In this paper we combine the two: the economic and physical. For each proppant mass we first optimize the fracture physically and then we apply the NPV criterion. We perform a series of parametric studies for a range of reservoirs and we use economic variables that differ in various parts of the world. We show how to determine the optimum fracture size. We then show how fracture treatments may be attractive in certain reservoirs in mature areas but not attractive elsewhere. We also show that for a diversified company, given the choice, few successful fractures in high-permeability reservoirs are far preferable to fracturing large numbers of wells in lower permeability fields, although the latter can be made economically attractive only through hydraulic fracturing.

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Section: Introductionmentioning

confidence: 99%

Economic and Physical Optimization of Hydraulic Fracturing

2008

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“…By assuming so, and with such skins invariably of large negative values, it is no wonder that the effects of turbulence have been underestimated by Joshi and others who have used his solution. Diyashev and Economides (2006) calculated vertical well equivalent skins for horizontal wells by using an expression derived from Joshi's own horizontal well equation .…”

Section: Reservoirmentioning

confidence: 99%

“…Thus, J D values around 0.1 denote undamaged wells. Smaller values denote damage; larger values denote stimulation such as hydraulic fracturing, or more favorable geometry such as horizontal or complex well architecture (Diyashev and Economides, 2006). …”

Section: The Concept Of Dimensionless Productivity Indexmentioning

confidence: 99%

Natural Gas Production

Wang¹,

Economides

2009

Advanced Natural Gas Engineering

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“…The merits of horizontal wells vs vertical fractured wells have been the subject of many publications in the past. Diyashev and Economides (2005) have shown how reservoir thickness and reservoir permeability and permeability anisotropy can tilt the balance towards either the vertical fractured well or the horizontal non-fractured well. Economides et al (2002) and Romero et al (2002) introduced a physical optimization technique to maximize the fractured well productivity index.…”

Section: Introductionmentioning

confidence: 99%

“…The optimal dimensionless fracture conductivity is ( ) .. (6) With this optimal dimensionless fracture conductivity the appropriate fracture length and width can be determined:…”

Section: Introductionmentioning

confidence: 99%

Transversely Multifractured Horizontal Wells: A Recipe for Success

2006

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractWhile the hydraulic fracturing of vertical wells is perhaps the most widely used method for production/injection enhancement in the petroleum industry, the fracturing of horizontal wells has been used sparsely, mostly in the United States and the North Sea. Usually this involves either longitudinal fractures or treatments with no regard to the well orientation and fracture azimuth. A new abrasive jet cutting tool has now been designed and built specifically for this type of jobs.In this paper we will present all the design and operational challenges that will be faced in such fracturing project, and make recommendations for successful treatments

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A General Approach to Well Evaluation

Cited by 21 publications

References 7 publications

Economic and Physical Optimization of Hydraulic Fracturing

Economic and Physical Optimization of Hydraulic Fracturing

Natural Gas Production

Transversely Multifractured Horizontal Wells: A Recipe for Success

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