Preliminary Research on Protective Performance of a New Drilling Fluid for Shale Gas Reservoir in Northwest Hu-nan
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摘要: 文中提出了一种液态离子固结剂,该处理剂能够有效提高页岩气井井壁的力学强度。通过开展室内实验以及进行相关分析,初步了解了添加液态离子固结剂的钻井液的基本性能,并探究了该体系钻井液对炭质页岩膨胀的抑制性以及对炭质页岩力学强度的影响。发现钻井液滤失量随液态离子固结剂含量的增加先减小后增大;在各配方钻井液中的压制岩心膨胀率明显低于在清水中的,但液态离子固结剂含量增加使得钻井液中的压制岩心膨胀率越来越高;各钻井液处理的岩粉所制成的剪切试样抗剪强度高于经清水处理的,随着液态离子固结剂含量的增加,试样抗剪强度总体上先升高再下降,且试样单轴抗压强度增大。实验结果表明,在适宜的含量范围内,液态离子固结剂有助于增强钻井液维护井壁稳定的能力。Abstract: This paper presents a kind of liquid ionic consolidation agent, and this agent can effectively improve mechanical strength of shale gas wells.Through laboratory experiments, the basic properties of the drilling fluid treated with the liquidi-onic consolidation agent and inhibition of this kind of drilling fluid on the expansion of carbonaceous shale and effects of this kind of drilling fluid on mechanical strength ofcarbonaceous shale were uncovered.The drilling fluid's filtration decreased and then in creased with the increase of the concentration of the liquid ionic consolidation agent.The expansion rate of the compressed core in the drilling fluid was lower than that inclear water.But with the increaseof the liquid ionic consolidation agent, the expansion rate of the compressed core in the drilling fluid was higher and higher.The shear strength of the shear specimens treated with the drilling fluid was higher than that treated with water.With the increase of the liquid ionic consol-idation agent, the shear strength of shear specimens increased and then decreased, and the uniaxial compressive strength of the samples were increased.The results demonstrate that liquid ionic consolidation agent in suitable content range helps to enhance the ability of drilling fluid to maintain the stability of borehole wall.
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Key words:
- shale gas /
- drilling fluid /
- borehole stability /
- expansion rate of the core /
- Northwest Hunan
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