加砂泥浆在砂性地层中成膜效率试验

发布时间：2018-07-10 10:24

本文选题：泥水盾构 + 砂性地层　；参考：《林业工程学报》2017年06期

【摘要】：在泥浆中添加粗粒材料是解决高透水地层成膜困难的一个重要手段,但粗粒材料在泥浆中容易产生沉降分离,制约了粗粒材料堵塞地层机制的研究。为揭示含粗粒材料的泥浆在砂性地层中的堵塞机制,通过自制试验仪器开展添加轻质砂的泥浆在砂性地层中侵入成膜特征影响的试验研究。结果表明:选取轻质砂作为粗粒材料可以有效解决粗粒材料沉降分离对试验结果的影响;部分无法成膜的泥浆通过添加粗粒材料,可以实现成膜的目的;适量添加粗粒材料可以有效缩短成膜时间和降低成膜滤失量,改善成膜效率,但添加量达到一定值,其改善效果降低;粗粒材料在地层大孔隙中架桥堵塞形成泥膜骨架结构,泥膜质量得到提高;粒径为0.5 mm的轻质砂在试验砂性地层中成膜效果较好,选取合适粒径的粗粒材料对成膜效果尤为重要;添加量和粒径范围是两个关键的影响因素,二者范围的确定可为实际工程泥浆的制备提供指导。
[Abstract]:Adding coarse grained material to mud is an important method to solve the difficulty of film formation in high permeability formation, but coarse grained material is easy to produce sedimentation separation in mud, which restricts the study of mechanism of coarse grained material blocking formation. In order to reveal the plugging mechanism of mud containing coarse grained material in sand formation, the influence of mud with light sand on the characteristics of invading film in sandy formation was studied by means of self-made test instrument. The results show that the influence of sedimentation separation on the test results can be effectively solved by selecting light sand as coarse grained material, and the film forming purpose can be achieved by adding coarse grained material to some mud which can not form film. Appropriate amount of coarse grained material can effectively shorten film forming time, reduce film-forming filtration and improve film-forming efficiency, but when the amount of coarse grained material reaches a certain value, its improvement effect is reduced, and coarse grained material is bridged and blocked in formation macropores to form mud membrane skeleton structure. The quality of slime film was improved, the film-forming effect of lightweight sand with diameter of 0.5 mm was better in the experimental sand formation, the selection of coarse grained material with appropriate particle size was particularly important for the film-forming effect, and the addition amount and the particle size range were two key factors affecting the film-forming effect. The determination of the range of the two can provide guidance for the preparation of practical engineering mud.
【作者单位】：南京林业大学土木工程学院;莫纳什大学工程学院土木工程系;河海大学岩土力学与堤坝工程教育部重点实验室;
【基金】：国家自然科学基金(51508278) 江苏省自然科学基金(BK20140979) 江苏省高校自然科学研究项目(14KJB560011) 高等学校博士学科点专项科研基金资助项目(20133204120014) 河海大学岩土力学与堤坝工程教育部重点实验室开放基金(GH201402)
【分类号】：U455.43

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