Pickering Stabilized Drilling Fluids for deep and ultra-deep Drilling Operations

Abstract : This enduring situation of volatile oil prices has been seen as a decline and a challenge at the same time for the oil and gas industry. It is during this slump that the oil and gas companies own the opportunity to focus on cost-effective production solutions, which very often means bringing new technologies and further improving processes.This work presents a novel frontier of surfactant-free drilling and completion fluids for deep and ultra-deep wells. This new generation of drilling fluids is based on the principle of Pickering emulsions (emulsions stabilized solely by solid nano particles). Hydrophobic and hydrophilic silica nano particles were used to stabilize Oil-Based Mud and Water-Based Mud. These fluids were designed to be used under hostile conditions of temperature and pressure. Therefore, a concrete characterization of their stability as well as their rheological properties under HTHP conditions was mandatory. Rheological profiles reflecting the flowability, hole cleaning capacity as well as cutting transport ability of the fluids were established. On the other hand, the electrical stability as well as the morphology (Droplet Size Distribution) of the emulsions were studied and compared with surfactant-stabilized drilling fluids. The fluids were submitted to an aging process allowing one to study the effect of hostile reservoir environment on the stability and rheology of the new fluids prepared.These high quality fluids were seen very reliable offering high stability as well as high capacity to withstand extreme reservoir conditions giving rise to a new generation of drilling fluids allowing breaking the frontiers of deep and ultra-deep reservoirs.
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Ramy Ghosn. Pickering Stabilized Drilling Fluids for deep and ultra-deep Drilling Operations. Chemical engineering. Université Paris-Saclay, 2016. English. ⟨NNT : 2016SACLY022⟩. ⟨tel-01573468⟩

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