Weight Distribution in Reaming While Drilling BHAs

Hole opening with bit and reamer, continues to receive attention in the drilling industry (Meyer-Heye, et al, 2010), due to the operation's numerous advantages. In comparison to conventional (single diameter) drilling, hole opening bottom hole assemblies (BHAs), are more complicated, in terms of their design and operation. The presence of two cutting tools, bit and reamer, in hole opening BHAs present additional drilling dynamics challenges (Heisig, et al, 1998). As a result of these issues, hole opening applications are commonly plagued by the following shortfalls -shorter BHA runs, excessive vibrations (Fear, et al, 1997), downhole tool failures, poor borehole quality, lower rate of penetration (ROP), and compromised directional performance (Mensa-Wilmot, et al 2014). These challenges, which have drastic negative effects on operational costs, amplify in harsh drilling environments (Mensa-Wilmot, et al, 2001).The above issues must be addressed, to ensure cost trend reversals in hole opening applications. This objective requires solutions that focus on the challenges at their sources of initiation. Most important the solutions must ensure consistent and continuous gains in performance. This paper will present new concepts in hole opening, with regards to project analysis, planning, and execution. The discussions will identify and resolve specific hole opening challenges, with emphasis on harsh environment drilling applications. Field cases with supporting data, highlighting the impact of new solutions on project cost reductions, will also be presented. BackgroundSeveral methods, that use different cutting tools ( Figure 1) and BHAs, currently exist for hole opening operations. The available scenarios have dissimilar attributes, capabilities, and operational efficiencies. Considering the challenges posed by the different options, the bit/reamer strategy (Figure 2) is seen as the most efficient and productive approach. Comparisons and evaluations, upon which these positions are based, have been documented by the industry.

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Innovative Product Concepts and Drilling Practices Improve Bit and Reamer Performances in Harsh Drilling Environments

Mensa-Wilmot

Gagneaux

Woldtvedt

2015

SPE/IADC Drilling Conference and Exhibition

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Implementation of a novel eccentric dog leg reamer in oil well drilling

Shokry

Elgibaly

Salem

2021

J Petrol Explor Prod Technol

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A high-quality wellbore is generally considered to have a gauge hole, a smooth wellbore and a wellbore with minimum tortuosity. Therefore, dog leg reamers (DLRs) have been recently proposed and implemented to specifically provide a high-quality wellbore which in turn improves the overall drilling performance. These improvements include smoothening the wellbore from high in place dogleg, lowering drag values, improving the tripping performance, increasing the success ratio of wireline logging tools to reach total depths and enhancing the casing and cement jobs. DLRs are an eccentric string reamers which have been recently designed and optimized using modelling software, and a mathematical model has been deduced to specify the weight and torque distribution between the bit and DLR based on mechanical specific energies at bit and DLR with a model accuracy closely matches the field data. A total of twenty five runs all over the world have been performed to date in hole sizes ranging from 12¼″ to 6″. Directional work has also been performed showing good directional control with this system, and no vibration issues have been reported. The development of this down hole tool has added new capability to the industry in the optimization of hole enlargement applications. The benefit is realized in a reduced number of days required to drill the well and in reduced total well cost. In addition, getting casing into the hole sooner reduces the accompanying risks and can contribute to reducing operational nonproductive time. Several case studies from three fields X, Y and Z from Egypt, Oman and Saudi Arabia, respectively, will be discussed to demonstrate the positive economic impact of deploying DLR in not only the deviated holes but also in vertical wells.

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Weight Distribution Characteristics During the Process of Hole Enlargement When Drilling

Jiang

Zhu

et al. 2018

Arab J Sci Eng

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Weight Distribution in Reaming While Drilling BHAs

Cited by 21 publications

References 19 publications

Innovative Product Concepts and Drilling Practices Improve Bit and Reamer Performances in Harsh Drilling Environments

Innovative Product Concepts and Drilling Practices Improve Bit and Reamer Performances in Harsh Drilling Environments

Implementation of a novel eccentric dog leg reamer in oil well drilling

Weight Distribution Characteristics During the Process of Hole Enlargement When Drilling

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