中梁水库喀斯特发育区组合灌浆技术探讨     

屈昌华  昝廷东  周树灯 《探矿工程》2012,39(4):48-50

中梁水库喀斯特发育,根据其发育特点采用了以高压水泥灌浆为主,多种方法相互组合的灌浆技术,其优点在于设备配置及工艺简单、功效高、造价低等。通过对中梁水库喀斯特发育区组合灌浆处理技术进行有益的探讨,为喀斯特地区水库防渗堵漏处理提供了一种新思路。  相似文献   

小秦岭深部探矿项目某标段钻探施工方法探讨          下载免费PDF全文

李振学  孙建刚  汤玉才 《探矿工程》2012,39(7):14-16,20

从钻孔护壁堵漏、钻孔结构、事故预防与处理措施等方面对小秦岭深部探矿项目某标段钻探施工方法进行了探索,特别是强护壁性能的冲洗液和多级大量套管技术的应用取得突破,基本解决了第四系、第三系加断层泥埋藏深度达600～800 m的厚覆盖层钻探施工难题,为该类地层施工提供了经验。  相似文献   

保德区块中低阶煤层压裂施工砂堵原因分析及技术对策          下载免费PDF全文

师伟  李孟  樊洪波 《探矿工程》2016,43(12):12-17

针对保德区块中低阶煤储层压裂过程中容易出现砂堵影响储层改造效果的问题,根据研究区块的地质条件,结合水力压裂时裂缝在煤层中的扩展规律,分析了保德区块煤层水力压裂出现砂堵的4类主要原因,分别为煤储层裂隙相对发育造成压裂液滤失量增加、压裂沟通高渗透性的顶底板、煤储层本身有效厚度大滤失量增大及多层合压造缝不充分。在此基础上,提出了相应的技术对策,使用清洁压裂液、适当提高并稳定施工排量及优化压裂施工设计,为现场的水力压裂施工和提高煤储层改造效果提供重要指导。  相似文献   

地质钻探中的井漏及堵漏材料研究     

毛洪江 《西北地质》2010,43(3):141-146

通过对钻探过程中井漏的复杂地质因素分析,提出了水化膨胀复合材料体系,并对该体系进行了膨胀性、封堵性及复合桥接堵漏模拟实验。实验结果表明,堵漏材料PAR具有很强的吸水膨胀性能,可膨胀至原体积的几十倍,且时间快有利于形成快速的封堵。材料PAR与稻谷和锯末形成的复合堵漏材料具有很强的堵塞率,可达70%以上。承压堵漏测量装置中测试表明:复合堵漏体系不仅能形成封堵,而且能够承受一定的压差。在云南临仓市勐简乡铅锌矿钻探过程中,运用复合堵漏体系满足了该地区复杂地矿钻探需要。  相似文献   

A new look at the phenomenon of offshore pile plugging     

Samuel G. Paikowsky  Robert V. Whitman  Mohsen M. Baligh 《Marine Georesources & Geotechnology》2013,31(3):213-230

Abstract

Open‐pipe piles are widely used for offshore structures. During the initial stage of installation, soil enters the pile at a rate equal to the pile penetration. As penetration continues, the inner soil cylinder may develop sufficient frictional resistance to prevent further soil intrusion, causing the pile to become plugged. The open‐ended pile then assumes the penetration characteristics of a closed‐ended pile. The mode of pile penetration significantly alters the soil‐pile interaction during and after installation. This affects the ultimate static bearing capacity (mainly in granular materials), the time‐dependent pile capacity (in clays), and the dynamic behavior and analysis of the piles.

Following a summary demonstrating the effects of pile plugging, a review of the common view of offshore pile plugging is undertaken. The interpretation of plugging by referring to the average plug length has led to the erroneous conclusion that in most piles significant plugging action does not occur.

Establishment of an analogy between soil samplers and open‐ended piles enabled correct identification of plugging by referring to the incremental changes in plug length. Examination of case histories of plugging of offshore piles revealed that beyond a certain penetration depth‐to‐diameter ratio, most piles are plugged.  相似文献   

Behavior of soil plugs in open‐ended model piles driven into sands     

Kyu‐Ho Paik  Seung‐Rae Lee 《Marine Georesources & Geotechnology》2013,31(4):353-373

Calibration chamber tests were conducted on open‐ended model piles driven into dried siliceous sands with different soil conditions in order to clarify the effect of soil conditions on load transfer mechanism in the soil plug. The model pile used in the test series was devised so that the bearing capacity of an open‐ended pile could be measured as three components: outside shaft resistance, plug resistance, and tip resistance. Under the assumption that the unit shaft resistance due to pile‐soil plug interaction varies linearly near the pile tip, the plug resistance was estimated. The plug capacity, which was defined as the plug resistance at ultimate condition, is mainly dependent on the ambient lateral pressure and relative density. The length of wedged plug that transfers the load decreases with the decrease of relative density, but it is independent of the ambient pressure and penetration depth. Under several assumptions, the value of earth pressure coefficient in the soil plug can be calculated. It gradually reduces with increase in the longitudinal distance from the pile tip. At the bottom of the soil plug, it tends to decrease with increase in the penetration depth and relative density, and to increase with the increase of ambient pressure. This may be attributed to (1) the decrease of friction angle as a result of increase in the effective vertical stress, (2) the difference in the dilation degree of the soil plug during driving with ambient pressures, and (3) the difference in compaction degree of soil plug during driving with relative densities. Based on the test results, an empirical equation was suggested to compute the earth pressure coefficient to be used in the calculation of plug capacity using one‐dimensional analysis, and it produces proper plug capacities for all soil conditions.  相似文献   

海上油田泡沫堵水技术研究与应用     

刘晖  李翔  徐国瑞  郭宏峰 《海洋地质译丛》2012,(2):59-63

如何有效地实现控水增油是目前海上油田进行高效高速开发所面临的问题。泡沫堵水技术作为一项控水增油的增产工艺措施在陆上油田得到了成功的应用,且近年来泡沫设备的改进使得该技术在海上油田的应用成为可能。此文通过泡沫静态实验、动态实验优选出了适合目标油藏条件的高效起泡剂,并对泡沫的油敏性,封堵能力,提高采收率性能进行了研究。实验结果表明,筛选出的起泡剂就有较好的起泡性能,泡沫具有较好的堵水效果,堵水率最高达到97．8％,且对高渗模型提高采收率幅度达到15．9％。通过在海上油田的应用,该技术实现了控水增油的作用,取得了较好的增产效果。  相似文献   

高原寒冷地区温拌沥青混合料水稳性能分析   总被引：1，自引：1，他引：0  

罗要飞  张争奇  张苛 《冰川冻土》2016,38(6):1592-1597

为探讨高原寒冷地区温拌沥青混合料的水稳定性及性能衰变规律,采用多次冻融循环室内试验模拟混合料所处环境温差大、冻融频繁、气温低等特性,选取Aspha-min、Sasobit、Evotherm等不同类型温拌剂拌制混合料,通过冻融劈裂试验、冻融飞散试验等,分析热拌与温拌沥青混合料的水稳性能及其衰变趋势,定量说明频繁的冻融循环对其性能的影响。结果表明：气候因素长期作用下,热拌沥青混合料的水稳性能优于温拌沥青混合料;随着冻融循环次数的增加,混合料的水稳性能均逐渐下降,15~18次冻融循环后,水稳性能趋于稳定,建议在高寒地区选取15次冻融循环作用次数作为沥青混合料水稳性能评价的试验条件;在选取的3种温拌沥青混合料中,Aspha-min温拌沥青混合料的水稳性能最差。  相似文献   

钢套管灌注群桩施工顺序对多隧道的影响     

宋福贵  王炳龙  黄大维  张超  李培妍 《岩土力学》2012,33(8):2330-2336

通过理论研究和数值分析方法,分析了钢套管桩不同的施工顺序对邻近既有隧道的影响,并结合现场实测数据对分析结果进行了验证。首先,采用理论方法分析钢套管旋转下压过程中土塞柱的受力情况,建立微分方程计算土塞柱底端的应力、土塞柱受到的剪切扭矩和自身抗剪扭矩,进而分析得到了土塞柱发生剪切破坏和土塞效应的临界深度。在此基础上按是否产生闭塞效应,分两种情况研究了钢套管旋压过程中产生的土体膨胀率。然后,利用既得的土体膨胀率,通过理论分析和数值模拟方法分析了群桩不同的施工顺序对既有多条盾构隧道的影响,得出了相对较优的群桩施工顺序方案。工程现场实测数据与数值模拟结果的对比分析表明,上述计算结果与实际情况能较好吻合。该研究对类似工程具有理论指导意义和实践参考价值。  相似文献   

纳微米聚合物微球的水化膨胀封堵性能   总被引：1，自引：0，他引：1  

李娟  朱维耀  龙运前  兰喜艳  杨智慧 《东北石油大学学报》2012,(3):52-57,8

为改善聚合物微球的深度调剖效果,利用蒸馏沉淀聚合法制备纳微米聚合物微球,并利用激光粒度分析仪、微孔滤膜装置和驱替装置对纳微米聚合物微球的粒径、水化膨胀能力和变形封堵能力进行测试分析.结果表明:纳微米聚合物微球为较规则均匀的球形,粒径分布集中,具有良好的水化膨胀性能;随着盐矿化度增大,纳微米聚合物微球膨胀性能变差;随着温度升高,微球的膨胀性能变强;在氯化钙和氯化镁水型中,微球膨胀性能变差;在酸性和碱性环境中,微球膨胀性能变差;随着水化时间增长,微球的封堵性能和变形能力逐渐增强,对孔道产生有效封堵的同时又能变形通过孔道,在渗透率较低的岩心中具有更好的深度调剖效果.  相似文献