Abstract

Drilling fluids show significant role in the success of drilling operations of oil and gas well. Lubricating and rheological properties are important for efficient drilling leading to improved oil/gas production. The current work deals with assessing the lubricating properties of 16 different water-based drilling fluids using five lubricants and scrutinizing their consequence on the rheology of the mud, filtration properties and mud cake thickness. Experiments are carried out at 90 °C by hot rolling the drilling fluids. After aging, the rheological, API HPHT filtration loss, and lubricating properties of mud are measured at ambient conditions. The results have been discussed in relation to the effect of lubricants on the recovery performance of oil and gas from reservoir. Increased lubrication provides enhancement in rate of penetration, with improved drilling efficiency into the oil and gas reservoir rock formation. The HPHT filter press test showed permissible fluid loss for all the drilling fluid systems containing lubricants with thin and impermeable filter cake formation. The thin mud cake and less fluid loss into the reservoir indicate less reservoir damage while drilling thus indicating enhanced recovery of oil and gas during production operation.

摘要

钻井液在成功钻探油气井中发挥着重要作用。润滑和流变特性对于有效钻探至关重要，可提高油气产量。目前的工作涉及使用五种润滑剂评估16种不同的水基钻井液的润滑性能，并仔细研究其对泥浆流变性，过滤性能和泥饼厚度的影响。在90°C下通过热轧钻井液进行实验。老化后，在环境条件下测量泥浆的流变性，API HPHT过滤损失和润滑性能。已经讨论了有关润滑剂对从储层中采收油气的性能的影响的结果。增加润滑可提高渗透率，提高了油气藏岩层的钻井效率。HPHT压滤机测试表明，对于所有含有润滑剂的钻井液系统，其形成的滤饼都很薄且不可渗透，允许的滤失量是多少。薄的泥饼和较少的流体损失到储层中，这表明钻井时储层的损害较小，因此表明在生产作业期间油气的采收率提高了。