Optimization of Slimhole Dual-Body Bits by Experiments and Computational Fluid Dynamics

Sousa, J.T.V. de; Prohaska, Michael; Bencic, A.; Millheim, Keith K.

doi:10.2118/54595-ms

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…Reduction of the overall drilling costs has been mentioned among the most significant issues in the petroleum industry (Brunsman et al, 1994;De Sousa et al, 1999). One of the most reliable methods to attain a considerable decrease in costs is the use of slim-hole drilling (Jafarifar et al, 2020;Pks and Yerubandi, 2010;Scott and Earl, 1961;Cohen et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Application of soft computing approaches for modeling annular pressure loss of slim-hole wells in one of Iranian central oil fields

et al. 2023

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In order to have a better control over the drilling process and reduce the overall cost of this drilling operation, engineers have tried to use soft computing (SC) techniques to conduct the preestimation of drilling events. It is critically important to estimate the annular pressure losses (APL) for non-Newtonian drilling muds within annulus in order to specify pump rates and also to be able to choose the most appropriate mud pump systems while conducting the drilling operations. To develop the vigorous and exact models to enable the prediction of APL, two popular models were employed, i.e., multilayer perceptron (MLP) [optimized by levenbergmarquardt (LM), bayesian regularization (BR), scaled conjugate gradient (SCG), Resilient back propagation (RB), and broyden fletcher goldfarb shanno (BFGS)] and radial basis function (RBF). Subsequently, applying a committee machine intelligent system (CMIS), the four top models were combined into a unit paradigm. Several tools such as error distribution diagram, cross plot, trend analysis, and cumulative frequency diagram were used in conjunction with statistical calculation to assess the efficiency of models. Consequently, the CMIS model was introduced as the most exact technique which has the greatest coefficient of determination (R 2 close to one) as well as the lowest root mean square error (RMSE close to zero) for the tested dataset.

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Section: Introductionmentioning

confidence: 99%

Application of soft computing approaches for modeling annular pressure loss of slim-hole wells in one of Iranian central oil fields

et al. 2023

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“…There are several RWD techniques, one of which is the dualbody bits as is discussed in this work. The RWD topic has been also considered for slim-hole wireline continuous core drilling [12][13][14]. Dual-body bits have several provided several advantages in improving the drilling performance including:…”

Section: Introductionmentioning

confidence: 99%

“…• Providing a sufficiently large borehole and more complex completion string access to reservoir has several advantages for exploration and production wells [15]. Despite the advantages, the deployment of two cutting tools (i.e., the pilot bit and reamer) in the bottomhole assembly (BHA) leads to additional drill-string vibrations because the weight and torque will be distributed between the pilot and reamer [10][11][12][13][14][15][16]. Therefore, hole enlargement generally suffers from downhole tool failures, shorter BHA life-time, lower drilling performance, poor borehole quality, and compromised directional efficiency [11].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation of Drilling Performance Improvement Using Reaming While Drilling

Roohi

Ashena

Thonhauser

et al. 2021

Journal of Energy Resources Technology

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This work investigates the drilling performance by reaming while drilling (RWD) using a dual-body bit and compared it with conventional drilling by a standard drilling bit. The dual-body bit consisted of a 2.45-in pilot bit located at a short distance ahead of a 2.47*3.97-in reamer. Conducting a series of drilling experiments at a simulation drilling rig with full monitoring sensors, we further studied the drilling performance as a function of the distance between the pilot bit and the reamer which affect mud diffusion and the resultant change in pore pressure and stress. A method was devised to eliminate the drill-string vibration and its effect on the drilling performance and the energy consumed. The mechanical specific energy (MSE) calculated for each case was considered as a drilling performance indicator. Using two laboratory experiments as well as analytical thermo-poro-elastic calculations of the Mechanical Specific Energy (MSE), the MSE changes were monitored and recorded. Comparison of this drilling performance indicator was used in both the RWD and the conventional drilling assembly to analyze the effect of RWD. Based on the results, with increasing the distance between the pilot bit and reamer, there is an increase in improvement of drilling performance in terms of MSE reduction. The best drilling performance indicator (MSE reduction of 84%) was observed with the distance between the pilot bit and the reamer of 43.3 cm. This is considered a novel finding in reaming while drilling.

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Computational Fluid Dynamics (CFD) as a Tool to Study Cutting Transport in Wellbores

et al. 2002

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In a drilling operation hole cleaning plays an important role. Improper hole cleaning can lead to problems like reduced penetration rate, torque and drag increase, and increase in pipe sticking potential. Cutting transport in a wellbore is a complex problem affected by several parameters such as mud density, cutting size and density, rate of penetration and mud circulation rate. Researchers conducted experiments with different setups representing annulus flow in a limited number of hole sizes to investigate the contribution of several physical and operating conditions. Due to time and cost involved in the construction and conduction of the experiments all reported studies are limited to physical model dimensions and operating parameters. In this study, we introduced a new approach to determine the parameters affecting cutting transport in any wellbore. This method utilizes a Computational Fluid Dynamics (CFD) software program. The effectiveness of selected program was determined by simulating successfully results from an experiment reported in literature. Presented in this study are the effects of cutting and mud properties on the cutting transport efficiency for vertical and horizontal wellbores. This approach eliminates the need for expensive laboratory setups and can be used to study unlimited number of physical and operational conditions in any wellbore. Introduction Cutting removal is one of the critical components of drilling operation. Faster the formed particles are displaced by the drilling fluid better the penetration rates due to contact of bit with fresh formation surface. Adequate circulation rates needed to displace cuttings formed. At the same time proper mud properties must be maintained to avoid problems such as stuck pipe and increased torque. An important mud property affected by cuttings is the density but this change is not uniform throughout the wellbore and can lead to problems. The interaction between particles and drilling fluids is a complex problem and existence of different wellbore conditions further complicates any prediction for adequate hole cleaning. The study of cutting transport has been a general interest to several researchers1. Initial studies were conducted with experimental setups to investigate the drill cutting transport in the annular sections of a wellbore2,3,4,5. Experiments were also conducted for directional and horizontal wells to study the transport characteristics and the parameters affecting the cutting transport6–14. Some of the research included theoretical models to describe the two-phase solid-liquid flow process7. The use of a CFD model is proven to be a successful tool in many areas of fluid flow15,16,17,18. More applications of CFD exist in the design and manufacture of drill bits and the related bit hydraulics19,20,21,22. Researchers simulated drilling conditions to visualize velocity and pressure gradients for different wellbore and bit geometry. Recent advances in computer hardware and increased capabilities allow researchers to investigate more complex problems.

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Optimization of Slimhole Dual-Body Bits by Experiments and Computational Fluid Dynamics

Cited by 3 publications

References 16 publications

Application of soft computing approaches for modeling annular pressure loss of slim-hole wells in one of Iranian central oil fields

Application of soft computing approaches for modeling annular pressure loss of slim-hole wells in one of Iranian central oil fields

An Experimental Investigation of Drilling Performance Improvement Using Reaming While Drilling

Computational Fluid Dynamics (CFD) as a Tool to Study Cutting Transport in Wellbores

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