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• W4241715211 abstract "Fracturing Pressures And Near-Well Fracture Geometry Of Arbitrarily Oriented And Horizontal Wells Z. Chen; Z. Chen Department of Petroleum Engineering, Texas A&M University Search for other works by this author on: This Site Google Scholar M.J. Economides M.J. Economides Department of Petroleum Engineering, Texas A&M University Search for other works by this author on: This Site Google Scholar Paper presented at the SPE Annual Technical Conference and Exhibition, Dallas, Texas, October 1995. Paper Number: SPE-30531-MS https://doi.org/10.2118/30531-MS Published: October 22 1995 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Chen, Z., and M.J. Economides. Fracturing Pressures And Near-Well Fracture Geometry Of Arbitrarily Oriented And Horizontal Wells. Paper presented at the SPE Annual Technical Conference and Exhibition, Dallas, Texas, October 1995. doi: https://doi.org/10.2118/30531-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Annual Technical Conference and Exhibition Search Advanced Search AbstractThe hydraulic fracturing of arbitrarily oriented and horizontal wells is made challenging by the far more complicated near-well fracture geometry compared to that of conventional vertical wells. This geometry is important both for hydraulic fracture propagation and the subsequent post-treatment well performance. Fracture tortuosity of arbitrarily oriented and horizontal wells is likely to cause large initiation pressures and reduction in the fracture widths. This paper presents a comprehensive study of the effects of important variables, including the principal stresses, wellbore orientation, and perforation configuration on fracture geometry. Initiation pressures. the contact between arbitrarily oriented wells and the fracture plane. and the near-well fracture geometry are determined and discussed. This study also shows that because of the near-well stress concentration the fracture width at the wellbore is always smaller than the maximum fracture width. This can have important consequences during hydraulic fracturing.IntroductionTerzaghi studied vertical well fracture initiation about 70 years ago. That work resulted in the famous Terzaghi criterion, which is relatively simple and easy to use. The initiation of a fracture from an arbitrarily deviated well (in general, a well not aligned with one of the principal stresses), however, is much more complicated. Fracturing from such a well may result in multiple fracture initiations with an eventual link-up of these starter fractures into a dominant one. Such a fracture during its propagation is likely to turn and twist in the near-wellbore region.Fracture tortuosity can lead to proppant bridging and premature screenouts. Even if brought to successful execution, tortuous fractures are likely to be choked with considerable reduction in the post-treatment production performance.Yew et al. studied the deviated-well fracture initiation and demonstrated theoretically that fracture reorientation happens only in the near-wellbore region. The influence of the wellbore on stress distribution decreases rapidly with distance r (proportional to 1/r2). Abass et al. and Hallam et al. explored this phenomenon experimentally and showed that the creation of nonplanar fracture geometries such as multiple. T-shape. and reoriented fractures depend on the wellbore direction relative to the in-situ stress field. An optimum wellbore azimuth is necessary to avoid the creation of undesirable fracture geometry. Sousa attempted to solve this problem numerically using fracture mechanics principles.In this paper, the following problems are addressed:The effects of well orientation on fracture initiation. The study is based on stress analysis. Generalized type curves are developed to guide perforation design and provide information on optimal well orientation for fracturing.Fracture tortuosity in the near-wellbore region. During propagation the fracture turns and adjusts toward the direction of minimum resistance. This path has a great impact on the near-well fracture geometry. A simple-to-use criterion is presented to predict the fracture orientation and width.Single- and multiple-wing fractures.P. 821 Keywords: wellbore, near-well fracture geometry, spe 30531, orientation, fracture initiation pressure, fracture geometry, propagation, plane, hydraulic fracturing, perforation Subjects: Hydraulic Fracturing This content is only available via PDF. 1995. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4241715211 title "Fracturing Pressures And Near-Well Fracture Geometry Of Arbitrarily Oriented And Horizontal Wells " @default.
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