Unique ROP Predictor Using Bit-specific Coefficient of Sliding Friction and Mechanical Efficiency as a Function of Confined Compressive Strength Impacts Drilling Performance

Caicedo, Hector U.; Calhoun, William Malcolm; Ewy, Russell T.

doi:10.2118/92576-ms

Cited by 67 publications

(15 citation statements)

References 6 publications

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“…ser realizado a partir da análise conjunta dos perfis de raios gama (RG), sônico (DT) e densidade (r) dos poços de correlação, que são aqueles perfurados anteriormente na área de uma nova locação (Caicedo et al 2005). Inicialmente, com o perfil RG, calcula-se o índice de ; V p é a velocidade da onda compressional derivada do perfil DT (m/s); V sh é calculada através das equações 2 ou 3 com o auxilio do perfil RG, e n, é o módulo de Poisson, o qual é assumido com um valor médio de 0,25 (Erling & Rune 1991).…”

Section: Materiais E Métodos O Cálculo De C´ Podeunclassified

“…Neste trabalho, utilizamos dados de poços perfurados no Golfo do México (Caicedo et al 2005), a fim de calcular C´ em alguns intervalos perfurados e INTRODUÇÃO Durante a elaboração de um projeto de perfuração são analisados os poços anteriormente perfurados no campo onde se planeja realizar uma nova locação. Nestas perfurações, denominadas de poços de correlação, são analisados a litologia, os perfis geofísi-cos de poço, os desgastes sofridos pelas brocas, as eventuais falhas ocorridas nos equipamentos, assim como, a compressibilidade uniaxial da rocha (C´).…”

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Aplicação de perfis geofísicos em projetos de perfuração de poços de petróleo no Golfo de México

Leite

Carrasquilla

Silva

et al. 2011

RBG

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Resumo A elaboração de um projeto de perfuração de poços de petróleo pode ser realizada através de uma abordagem que envolva conhecimentos científicos de várias disciplinas, tais como geologia, geofísica e engenharia de petróleo. Por este motivo, é de grande importância atuar na interface dessas áreas, a fim de mostrar como essa interação pode proporcionar uma visão interdisciplinar da fenomenologia envolvida no processo. No presente trabalho, foram analisados dados mecânicos, geológicos e geofísicos de dois poços do Golfo de México, com a finalidade de conhecer os parâmetros de perfuração e selecionar as brocas, fazendo possível, assim, a montagem de uma estratégia de perfuração de outros poços no campo estudado. Os resultados alcança-dos com o estudo dos perfis geofísicos indicam que, nos três intervalos observados, melhores brocas poderiam ter sido selecionadas. Entretanto, é importante ressaltar a experiência dos profissionais envolvidos num projeto de perfuração, pois, diversas vezes é preferível perfurar mais devagar e evitar a troca de broca por desgaste, que furar de forma rápida, mas ter que trocar continuamente a broca. Por fim, a utilização integrada de dados dos poços permite a otimização do projeto e a elaboração de um plano de perfuração, o que se traduz na melhor utilização dos recursos econômicos locados nessa atividade.Palavras-chave: perfis geofísicos de poço, Golfo do México, parâmetros de perfuração, estratégia de perfuração. Abstract Application of geophysical well logs on drilling exploration projects in the Gulf ofMexico. The execution of a drilling project of oil wells can be performed through an approach that involves scientific knowledge of diverse disciplines, such as geology, geophysicist and petroleum engineering. For this reason, it is of great importance to act in the interface of these areas, in order to demonstrate as this interaction can provide an interdisciplinary vision of the phenomena involved in the process. In the present work, mechanical, geological and geophysical data of two wells of the Gulf of Mexico had been analyzed, with the purpose to know the drilling parameters and to select the best perforation bits, making possible, thus, the assembly of a strategy of perforation of other wells in the studied oil field. The results reached in our study with the use of geophysical well logs indicate that, in the three observed intervals, better bits could have been selected. But, it is important to stand out that always the experience of the involved professionals in a drilling project must be considered. Therefore, several times is preferable to perforate slowly and to prevent the exchange of the consumed bits, that to drill in a fast form and have to change the bit continuously. However, the integrated use of the well data allows the optimization of the project and the elaboration of a perforation plan, which it is expressed in a better way to utilize the financial resources in this activity.

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Section: Materiais E Métodos O Cálculo De C´ Podeunclassified

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Aplicação de perfis geofísicos em projetos de perfuração de poços de petróleo no Golfo de México

Leite

Carrasquilla

Silva

et al. 2011

RBG

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“…The same is done for reamers. As shown by Caicedo (2005) the MSE can be used to monitor the drilling process, comparing it to the rock strength CCS, the drilling efficiency η can be derived,…”

Section: Mechanical Specific Energymentioning

confidence: 99%

Weight Distribution in Reaming While Drilling BHAs

Meyer-Heye

Reckmann

Ostermeyer

2010

IADC/SPE Drilling Conference and Exhibition

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Reaming while drilling (RWD) in general means to simultaneously drill a pilot hole and open it up to the target diameter at the same time. This could be done using an eccentric reaming device or an expandable concentric underreamer; both are called reamer in the following. In RWD assemblies the weight applied to the BHA is distributed between the bit and reamer. To ensure optimized performance drilling, it's necessary to know the distribution of weight as well as the distribution of torque in the BHA. For any calculation of drill string dynamics or tool durability the loads applied to the BHA are an essential input. The effort required to measure all loads while reaming is rather high so there is a need to calculate the weight and torque distribution from as few measurements as possible.Based on aggressiveness and mechanical specific energy (MSE), an analytical method is shown to calculate the load distribution in RWD BHAs. Therefore a new approach to aggressiveness is introduced for calculation at the bit and reamer. By combination of aggressiveness and MSE, it can be shown how to derive weight and torque distributions in a RWD BHA. Effects of formation changes or different drilling diameters on the rate of penetration (ROP) can be calculated, as well as changes in the load distribution. To prevent the reamer from disruptive weight and torque, depth of cut control (DOCC) technology can be applied at the bit as described by Thomson (2008). How this technology affects the reamer, even if only applied at the bit will be shown as well. Based on data from a field test where weight and torque on bit and on reamer were measured simultaneously the accuracy/validity of the method is shown.

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“…MSE has also been applied by various service providers to assess bit performance and by operating companies as a real-time tool to maximize ROP. [4][5][6][7][8][9] This paper builds on previous work by using modeled MSE and UCS values to optimize a PDC bit specifically designed to drill an entire hole section efficiently.…”

Section: Introductionmentioning

confidence: 99%

FEA Modelled MSE/UCS Values Optimise PDC Design for Entire Hole Section

Hammoutene

2012

All Days

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The value of the mechanical specific energy (MSE) concept to analyze drilling efficiency and bit performance is well established. Recent operator-driven research has concentrated on predicting and maximizing rate of penetration (ROP). The specific energy ROP model has been successfully implemented in numerous high-cost/high-profile environments. To further advance the mechanical specific energy (MSE) concept, an engineering team is developing a methodology to optimize polycrystalline diamond compact (PDC) bit design for the entire hole section based on modeled MSE and unconfined compressive strength (UCS) values.Traditionally, PDC design engineers adjust cutter density/size, back rake, blade count and nozzle placement to optimize the bit for a specific application. The goal is to maximize ROP and total footage capabilities by minimizing damaging vibrations (axial, lateral, torsional) in a predetermined series of formations. Generally, the selected design has the least potential for vibration across all lithology types. PDC bits can generally drill a homogeneous formation without issues, but when transitioning zones or penetrating interbedded/unexpected formations vibrations can lead to performance degradation and cutter damage.The industry requires a method to unify bit efficiency throughout the entire section on a meter-by-meter basis. To calculate a bit efficiency factor (E m ), engineers are utilizing a sophisticated, integrated, dynamic engineering modeling system. They start with a meter-by-meter correlation between actual borehole lithology and a digitized rock library (UCS). MSE is then calculated using the modeled drilling parameters, torque, and ROP. The resulting two curves are then standardized by calculating the mean value of MSE/UCS fraction to derive a hard value bit efficiency factor. By overlapping the two curves, design and field engineers can identify lithologies that have the optimum correlation then compute the mean efficiency factor for the interval and use it as baseline for the entire hole section.In the test case study a 38m thick shale section offered the best match, yielding a median efficiency factor. Using the fixed median efficiency factor, engineers designed and optimized a PDC bit for the entire 16-in. hole section instead of each specific formation. The resulting ROP was significantly improved, as is documented in a case study that will be presented.

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Unique ROP Predictor Using Bit-specific Coefficient of Sliding Friction and Mechanical Efficiency as a Function of Confined Compressive Strength Impacts Drilling Performance

Cited by 67 publications

References 6 publications

Aplicação de perfis geofísicos em projetos de perfuração de poços de petróleo no Golfo de México

Aplicação de perfis geofísicos em projetos de perfuração de poços de petróleo no Golfo de México

Weight Distribution in Reaming While Drilling BHAs

FEA Modelled MSE/UCS Values Optimise PDC Design for Entire Hole Section

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