抗高温水基钻完井液作用机理及性能评价

Mechanism and Performance Evaluation of High-temperature Resistant Water-based Drilling and Completion Fluids

随着深水油气资源开发逐渐转向高温高压油气田,钻完井液体系面临着极端温压条件下维持性能稳定性的挑战。采用高温高压失水仪和岩心流动实验装置,对新配制的抗高温水基钻完井液体系进行了一系列封堵性能和动态损害评价实验。结果表明:在160℃/16 h老化条件下,该钻井液体系展现了优异的流变性和滤失性能,API滤失量从4.3mL减少至2.8 mL,HTHP滤失量控制在11.5 mL以内。此外,通过加入1%~2%柔性颗粒RXK显著提高了岩心渗透率的恢复,截至岩心2 cm部分后的渗透率恢复值大多达到70%以上。该研究证明了所研制钻完井液在HTHP条件下具有出色的封堵效果和渗透率保护能力,对于实际高温高压油气井的钻探作业具有重要的应用价值和实际意义。

As the development of deepwater oil and gas resources gradually shifts to high-temperature and high-pressure oil and gas fields,drilling and completion fluid systems face the challenge of maintaining performance stability under extreme temperature and pressure conditions.In this paper,a high-temperature and high-pressure water loss instrument and a core flow experimental device were used to conduct a series of plugging performance and dynamic damage evaluation experiments on the newly prepared high-temperature resistant water-based drlling and completion fluid system.Experimental results showed that under the 160°C/16 h aging condition,the drilling fluid system exhibited excellent rheology and fluid loss properties.The API fluid loss was reduced from 4.3 mL to 2.8 mL,and the HTHP fluid loss was controlled within 11.5 mL.In addition,the recovery of core permeability was significantly improved by adding 1%~2% flexible particles RXK,and the permeability recovery value after catting the 2 cm part of the core mostly was more than 70%.This study proved that the developed drilling and completion fluid had excellent plugging effect and permeability protection ability under HTHP conditions,and had important application value and practical significance for the drilling operations of actual high-temperature and high-pressure oil and gas wells.