东胜气田钻井液废弃物处理与钻井液技术

Drilling Fluid Wastes Treatment and Drilling Fluid Technology in Dongsheng Gas Field

东胜气田某水平井钻探过程中应用钻井液不落地技术,通过电化学处理、沉淀、加药调整各项性能之后再次参与循环,岩屑无害化处理以降低废弃物污染。但钻井液中直径<5μm的固体颗粒没有完全清除,颗粒累积后会污染钻井液。污染后的钻井液导致各类井下复杂频发。这样会增加钻井成本,甚至使施工井报废。试验应用的氯化钾聚合物钻井液体系解决井壁失稳和井漏问题。对合理应用不落地技术和氯化钾聚合物钻井液体系提供了参考依据。

Drilling fluid recovery technology was applied in a horizontal well drilling process in Dongsheng gas field, by means of electrochemical treatment, precipitation and performance adjusting by reagent feeding; drilling fluid was recycled through harmless treatment to reduce wastes pollution. But the solid particles with diameters less than 5μm were still re- mained and drilling fluid would be polluted by these particles accumulation. The contaminated drilling fluid would lead to downhole accidents to increase drilling cost even well abandonment. Potassium chloride polymer drilling fluid system was applied for testing to solve borehole wall instability and lost circulation, which provides reference basis to reasonable appli- cation of drilling fluid recovery technology and potassium chloride polymer drilling fluid system.