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• W4233399265 abstract "Recent Advances in Deepwater Horizontal Injector Wells Acidizing in Campos Basin Alexandre Z.I. Pereira; Alexandre Z.I. Pereira Petrobras S.A. Search for other works by this author on: This Site Google Scholar Carlos Magno Chagas; Carlos Magno Chagas Petrobras Search for other works by this author on: This Site Google Scholar Edilson Pinto; Edilson Pinto Petrobras Search for other works by this author on: This Site Google Scholar Agostinho Calderon Agostinho Calderon Petrobras S.A. Search for other works by this author on: This Site Google Scholar Paper presented at the European Formation Damage Conference, Scheveningen, The Netherlands, May 2007. Paper Number: SPE-107787-MS https://doi.org/10.2118/107787-MS Published: May 30 2007 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Pereira, Alexandre Z.I., Chagas, Carlos Magno, Pinto, Edilson, and Agostinho Calderon. Recent Advances in Deepwater Horizontal Injector Wells Acidizing in Campos Basin. Paper presented at the European Formation Damage Conference, Scheveningen, The Netherlands, May 2007. doi: https://doi.org/10.2118/107787-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 European Formation Damage Conference and Exhibition Search Advanced Search AbstractIn most of its deepwater Campos Basin oilfields, Petrobras' strategy has been to develop the waterflooding systems by using open hole horizontal gravel packing. Both, perforation and gravel packing operations, are only possible by the presence of the filtercake, formed on the formation face during the drilling process. Nevertheless, that film becomes an impediment to injection and must be removed to obtain good injectivity.Despite the development of special tools that permit to acidize just after the gravel packing operation, there was still a need for reducing the operation time and to increase the damage removal efficiency.With this purpose, changes were made in the diverting systems to allow each acidizing stage to treat larger intervals, thus reducing the treatment's total number of stages. This improvement was possible by modeling the fluid flow through the tool's perforated extension, which saved 30% of the pumping time.Parallel to this development, acidizing historical data were revised and filtercake invasion studies were performed. The conclusion was that more aggressive acidizing formulations could be used, what reduced the pumping volume and reduced the job time even further, to about 50% of the previous times. Post job formation tests performed have shown that not only a job time reduction was achieved, but also, a better formation damage removal.The good effects observed have resulted in a general review in the design of the horizontal injectors acidizing jobs, improving the operation's safety, efficiency and effectiveness. This paper will describe the technique, job details and the results obtained for these particular operations.IntroductionHorizontal open hole gravel packs have been used as Petrobras' main strategy for the development of deepwater fields. Although the producer wells have usually presented very good results since the beginning of its utilization, the water injectors have presented a substantially more complex challenge, once they need to be acidized to achieve good injectivities, despite the care taken during the drilling and completion phases.Besides the acidizing tool's development, that allow to perform the treatment in small isolated sections of the horizontal gravel pack just after the gravel packing, and the general acidizing pumping method improvement, there is still a need for reducing the operation time, what could be achieved by two approaches:Reducing the total pumping volumeExtending the treated area per stageReduce the total pumping volume results in decreasing the treatment's dissolving power, what could induce a high residual damage. In the same way, a bigger treated area per stage could cause bad acid distribution and poor damage removal, due the difficulties to divert the treatment along a larger interval.To minimize those problems, studies involving the filter cake and filtrate / rock interaction were performed, allowing a better understanding of the damage mechanism. In parallel, studies regarding the diverting effects in larger intervals were performed to verify which were the dominant influences during the acidizing operations.The results of those researches have suggested the need for a great dissolving power, in order to improve the attack over the main damage area and, at the same time, to reduce the treatment volume. Also, it was achieved that the formation injectivity had the major influence over the diverting effects in a limited open hole section.In this manner, a significant reduction in the treatment volume and an increase in the HOHGP's treated area per acid stage were possible, resulting in a 30% reduction in the pumping time, without sacrificing the damage removal. Keywords: enhanced recovery, acidizing, Campos Basin, deepwater horizontal injector well, drilling operation, spe 107787, filter cake, sand control, waterflooding, Petrobras Subjects: Drilling Operations, Improved and Enhanced Recovery, Directional drilling, Gravel pack design & evaluation, Acidizing, Waterflooding, Sand Control, Completion Operations, Well Operations, Optimization and Stimulation This content is only available via PDF. 2007. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4233399265 title "Recent Advances in Deepwater Horizontal Injector Wells Acidizing in Campos Basin" @default.
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