Recyclable and Highly Inhibitive Stable Foam Drilling Fluid
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摘要: 针对泡沫钻井过程中一次性泡沫使用量大、耗材多以及井壁易失稳的问题，从泡沫循环以及泥页岩抑制机理出发，通过评价不同处理剂的性能，研制了可循环强抑制性稳定泡沫钻井液。采用常规泡沫性能评价方法、泡沫循环性能测试以及泥页岩抑制性能测试对其综合性能进行了评价。结果表明：NaCl质量分数、岩屑含量以及煤油加量分别达15%时，该泡沫钻井液在130 ℃下滚动16 h后，发泡体积维持在400 mL以上，说明其具有较好的抗温、抗污染能力；调节pH值进行8次循环以后其发泡体积仍维持在500 mL以上；泥页岩在该泡沫钻井液中的一次、二次滚动回收率达96%以上，泥页岩经其处理后的硬度与经白油处理后的硬度相近。研究结果表明，应用可循环强抑制性稳定泡沫钻井液进行钻井，可以避免地面泡沫大量堆积，降低钻井成本，同时能有效抑制黏土水化膨胀，且抑制性能持久，有利于维持泥页岩地层的稳定。Abstract: Recyclable and highly inhibitive stable foam drilling fluid was researched to reduce the large amount of disposable foam and related materials and solve wellbore stability issue in foam drilling.Based on the foam circulation and shale inhibition mechanisms,the recyclable and highly inhibitive stable foam drilling fluid was developed through the performance evaluation of different chemical agents.The comprehensive performance of the foam drilling fluid was evaluated through conventional foam performance evaluation,foam circulation performance test and shale inhibition performance test.The results showed that the foam drilling fluid kept above 400 mL foam volume with the hot rolling temperature of 130 ℃,the NaCl mass fraction of 15%,cuttings content of 15% and kerosene content of 15%,indicating good temperature tolerance and contamination resistance.Through the pH adjustment,the foam drilling fluid could keep a 500 mL foam volume after the eight foam circulation.The recovery rates of the shale in the foam drilling fluid stay above 96% both in the first and second rolling recovery tests and the shale kept a great hardness that was similar to the hardness of white oil treated shale.Thus,the foam drilling fluid not only could avoid the large accumulation of foam on the ground and save drilling costs,but also could effectively prohibit clay hydration and swelling for an extended period,and consequently enhance the wellbore stability in foam drilling.
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Keywords:
- foam drilling fluid /
- foamer /
- inhibitor /
- hole stabilization /
- drilling fluid property
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