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- W2058423073 abstract "Abstract 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." @default.
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- W2058423073 date "2010-02-02" @default.
- W2058423073 modified "2023-09-27" @default.
- W2058423073 title "Weight Distribution in Reaming While Drilling BHAs" @default.
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- W2058423073 doi "https://doi.org/10.2118/127094-ms" @default.
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