Abstract Nowadays, it is commonplace to say that acid fracture conductivity depends on the face asperities. Does really depend it? Almost thirty years ago, someone wrote, "We believe measured in these tests mainly due smoothing of peaks and valleys rough faces, independent rock heterogeneities small sample size." Moreover, almost one year "More asperities touch deform as closure stress increases. The channels become even shorter fewer openings are left." Between two extremes, came be pointed...

Abstract This paper presents a brief review of the available techniques in oil and gas industry to complete stimulate horizontal wells, with emphasis on low permeability carbonates. These can also be applied non-conventional reservoirs, particularly tight formations. The starts by reviewing lessons learned some chalk fields North Sea (Dan, Halfdan, South Arne, Valhall Eldfisk) few pilot projects offshore Brazil (Congro Enchova). Based these broad literature, devises considerations...

Abstract The application of hydrajet technique to stimulate highly-deviated and horizontal wells has become a successful method improve well productivity for different field conditions in the world. In past 2 years, an operator company successfully implemented relatively new stimulation shallow waters off Brazil. deepwater locations, additional problems had be overcome, which proved achievable using this technology. This paper discusses reservoir-based methodology determine optimum number...

Abstract The deep and hard limestones found off-shore Brazil are being extensively evaluated, some of them would require stimulation to enable commercial development. main objective this paper is discuss the feasibility acid fracturing in carbonates. Laboratory test performed verify whether an acid-induced fracture can withstand high effective normal stresses expected during exploitation stage pre-salt development, keeping acceptable conductivity. There no agreement technical community...

Abstract This paper presents the state of art in frac packing learned from more than a hundred operations performed Campos Basin, offshore Brazil. Many reservoirs Basin are clean tertiary age sandstones, very unconsolidated, with high to ultrahigh permeability. In this scenario, order get low skin completions, conductivity fractures must be created. These can only obtained use aggressive tip screen out (TSO) techniques. For these reasons, no questions remain about superiority pack when...

ABSTRACT The production of several wells from the Albacora ield (Campos Basin, Rio de Janeiro, Brazil) is being regressively lowered due to a paraffin deposition rows in subsea flowlines. low temperature considered be leading factor or waxing process deep water PETROBRÁS Production Department at Campos and it's Research Center are developing techniques adapt Nitrogen Generating System (NGS) operations designed clean flowlines mainly those serving Field. This comprises irreversible...

Abstract This paper presents the lessons learned by Petrobras after performing a total of 124 horizontal open hole gravel-packing operations in Campos Basin. The authors intend to describe how industry-provided standard gravel packing procedures had be continuously improved and/or adapted meet basin requirements, such as: -low fracture gradients, - long intervals packed, -pumping jobs performed from floating rigs and -the need sustain high production levels or injection rates justify huge...

Abstract The deep and hard carbonates found offshore Brazil are being extensively evaluated, some of them would require fracture stimulation to enable commercial development. Due the high effective normal stresses expected during exploitation stage pre-salt development, acid fractures could have very low conductivity values, depending on formation mechanical properties. Since perform propped is more risky, it important create selection criteria know precisely technique be used. There no...

Abstract In the past when hydraulically fracturing a reservoir with bottomhole temperature greater than 300°F (149°C), only choice for fluid was transition metal crosslinked CMHPG (carboxymethyhydroxypropyl guar) system. While being labeled as somewhat "clean" system, these zirconium systems required large volumes of gel stabilizers long term stability. Shear stability fluids also not good borate guar or HPG (hydroxypropyl used at lower temperatures. To improve shear above while lowering...

Abstract This paper presents the first offshore applications, both in platform and subsea wells, of a multiple fracture creation process openhole horizontal previously applied onshore scenarios. The applications had to overcome many challenges typical workovers on mature field wells. covers detailed workover planning, fracturing designs, operations data, stimulation results. campaign comprised three slotted liner wells Brazil as part research project evaluate selective methods for It was...

Abstract The Campos Basin mature fields, offshore Brazil, including the Marlim Field, are usually referred to as World's deepwater field laboratory. development of these fields was driven by Brazilian state energy needs throughout seventies and eighties, which induced a strategy accelerating projects implementation anticipating their first oil. This sense urgency is still dominant in oil politics has recently enabled country reach its self-sufficiency. That scenario last two decades...

Summary This paper provides a case history of the first hydraulic fracture on subsea horizontal well in Quissama formation, low-permeability limestone reservoir Campos basin, Brazil. The was drilled direction expected growth, thus evolving longitudinal fractures along section. It is part research project to evaluate selective stimulation methods for wells. Every aspect since drilling, completion, and evaluation handled with end mind hydraulically fracturing it several stages. Hydraulically...

Abstract The placement of multiple fractures in horizontal, deviated wells is usually more difficult than vertical wells. When completed with uncemented preperforated liners, such treatments become much and often are ineffective using conventional stimulation methods. found offshore locations, these present even problems. Recently, the shallow waters Brazil, a relatively new hydrajetting technology was used great success. However, additional complications arose when hydrajet fracturing...

Successful Pinpoint Placement of Multiple Fractures in Highly Deviated Wells Deepwater Offshore Brazil Fields Jim Basuki Surjaatmadja; Surjaatmadja Halliburton Energy Services Group Search for other works by this author on: This Site Google Scholar Carlos Gustavo Miranda; Miranda Valdo Ferreira Rodrigues; Rodrigues Petroleos Brasileiro S.A. Maria Gracas; Gracas Marcio Albuquerque Silveira; Silveira Petrobras Luis Fernando Neumann; Neumann Paulo Dore Fernandes Paper presented at the SPE...

Abstract The key issue to develop the Roncador field, located in ultra deep water offshore Campos Basin, Brazil, is maximization of production rate keeping completion reliability, avoiding premature high workover costs involved that scenario. reservoir has a succession thick turbidite sandstones containing 31° API oil, requiring sand control and injection maintain pressures above saturation’s. distance between pay zones are as short 12 meters, becoming first problem fit gravel assembly such...

Abstract In offshore horizontally completed wells, an acid job is usually pumped to remove the filter cake, previously created allow sand control equipment and gravel be placed across entire extended section. When such wells are acidized cake with a hydrochloric: hydrofluoric mixture, resulting skin values still in positive range. An improved HF system has been introduced Campos Basin-offshore Brazil outstanding results. The uses organophosphonic complex generation of dramatically reduce...

Case Study of Multiple Hydraulic Fracture Completion in a Subsea Horizontal Well, Campos Basin Luis Fernando Neumann; Neumann Petrobras S.A. Search for other works by this author on: This Site Google Scholar Paulo Dore Fernandes; Fernandes Marcos Antonio Rosolen; Rosolen Petroleos Brasileiro Valdo Ferreira Rodrigues; Rodrigues Jose Augusto da Silva Neto; Neto Carlos Alberto Pedroso; Pedroso Alfredo Mendez; Mendez BJ Services Company Daniel Santos Torres Halliburton Energy Group Paper...

Abstract Generally, offshore horizontal producer wells in Brazil do not require acid treatments after a gravel pack. The drill-in fluids’ filter cakes have low lift-off pressures and are readily produced through the screens. Injection wells, however, to break down cake establish skin factors favorable injection profiles. Improved HF Acid System has been used successfully packs or other remove fluid damage improve injectivity formation. Good designs were achieved knowledge lab tests. Due...

Petrobras pre-salt discovery is a huge hydrocarbon reserve located below an extensive layer of salt at about 5000 m depth. So far, the wells drilled this scenario found light oil in highly heterogeneous carbonates reservoirs. The formation permeability varies more than four orders magnitude. Some fields have most permeable zone with values ranging from 1 to 10 mD and requires stimulation order maximize productivity. This article will present first multi-fractured sub-horizontal well...

Abstract Proper design of sand control completions is critical for maintaining well integrity and achieving productivity objectives. This particularly important in Frade, a deepwater field situated 120 km offshore Brazil, where wells to be completed with gravel packs have narrow pressure operating windows. paper demonstrates the optimization process pack operations through detailed data evaluation. The continuous improvement involved pre-designing placement, conducting comprehensive post-job...

Proposal Most of the reservoirs located in Campos Basin, deepwater and ultra-deepwater offshore Brazil are described as unconsolidated sandstone that require sand control on both producers water injection wells. Horizontal Open Hole Gravel Pack completions preferred method development. Due to recent discoveries heavy oil reservoirs, there is a necessity longer horizontal open hole sections. Low fracture gradients may limit length gravel pack section because pressure increase during Beta wave...

Formation Damage History in the Mature Fields of Campos Basin Offshore Brazil V. F. Rodrigues; Rodrigues Petróleos Brasileiro Search for other works by this author on: This Site Google Scholar L. Neumann; Neumann K. Miura; Miura Tinoco; Tinoco J. B. M. Netto; Netto S. Daher Paper presented at European Conference, Scheveningen, The Netherlands, May 2007. Number: SPE-106389-MS https://doi.org/10.2118/106389-MS Published: 30 2007 Cite View Citation Add to Manager Share Icon Twitter LinkedIn Get...

Horizontal Well Completion and Stimulation Techniques—A Review With Emphasis on Low-Permeability Carbonates Valdo Ferreira Rodrigues; Rodrigues Petroleo Brasileiro S.A. Search for other works by this author on: This Site Google Scholar Luis Fernando Neumann; Neumann Daniel Torres; Torres Halliburton Energy Services Cesar Guimarães; Guimarães Schlumberger Ricardo Sadovski BJ Paper presented at the Latin American & Caribbean Petroleum Engineering Conference, Buenos Aires, Argentina, April...

ABSTRACT It is known that when fluids are injected into an offshore well, the temperature of fluid typically cooler than in-situ reservoir temperature. A region cooled rock forms around well and this contracts, leading to a decrease in horizontal situ stresses near well. Such effect always related with waterflooding or other secondary tertiary recovery processes long period time, such as days months injection. This article will show field evidence thermal effects can happen few minutes...