抗高温泡沫钻井液体系评价研究     

任小庆 《地质与勘探》2021,57(2):423-429

高温地热钻井过程中,温度会对泡沫钻井液体系稳定性造成影响。针对高温地热井泡沫钻井液的技术要点,分别对发泡剂、稳泡剂、抗温土的优选,在此基础之上分别对泡沫钻井液的抗高温性能、抗污染能力进行了评价。实验结果表明:(1)优选出的发泡剂/聚合物/粘土体系在不同温度下进行测试,均具有良好的泡沫稳定性和发泡能力,说明初步形成的泡沫体系具有良好的抗230℃高温的能力。(2)通过模拟欠平衡钻进过程中地热水对泡沫钻井液体系的污染发现,该体系耐一价盐能达到20%,而且在加入5%CaCl_2后析液半衰期仍在5 min以上,最终形成一套抗高温能力可达230℃,具有较好悬浮携带能力的地热井抗高温环保钻井液体系。  相似文献   

基于紧密堆积理论的低密度固井水泥浆设计   总被引：1，自引：1，他引：0       下载免费PDF全文

郑少军  王凯伦  刘思雨  刘天乐  蒋国盛  白世卿 《探矿工程》2021,48(3):94-100

合理的颗粒级配是提高固井水泥环内部密实度、早期力学强度和界面胶结能力的关键。基于此,本文从几种典型的连续颗粒级配的紧密堆积理论中优选出DFE进行固井水泥浆体系设计,并通过大量实验首次确定了适宜G级油井水泥基深水固井水泥浆体系设计的n值最优范围：0.33~0.40。结合激光粒度分析仪实测结果,在粒径≤3.38 μm、3.38~70.70 μm、≥70.70 μm三个范围内依次采用纳米CaCO₃（nano CaCO₃,以下简称“NC”）、G级油井水泥和漂珠,并按DFE（n=0.33~0.40）体积分布曲线进行混配。在此基础上,提出一种密度为1.50 g/cm³的低成本低温早强三元固相级配水泥浆体系,并与漂珠二元固相水泥浆体系和NC二元固相水泥浆体系的性能进行对比。研究结果表明：该三元体系水泥石的抗压强度、抗折强度和二界面胶结强度相比于漂珠二元体系和NC二元体系分别提高了7%~21.1%、13.4%~51.9%和41.4%~122.2%。三元体系的固井水泥石在垂向上的最大密度差为0.022 g/cm³。基于DFE设计的三元体系具有良好的流变性、稳定性和力学性能。DFE对于多元固井水泥浆体系的设计和应用具有一定的指导意义,在保证低密度的前提下能够有效地提高固井水泥石的早期强度和综合性能。  相似文献   

Research and application of mud proportioning optimization of slurry balance shield in mudstone and gravel composite stratum     

SONG Yang  LI Ang  WANG Wei-yi  DU Chun-sheng  ZHANG Duo  FU Xing-xing 《岩土力学》2021,41(12):4054-4062

Slurry performance is one of the key factors to maintain the stability of excavation face when slurry balance shield is tunneling in complex strata. Based on the engineering background of slurry shield tunneling in mudstone and gravel composite stratum of Nanning Metro Line 5, the control variable method and the self-made slurry shield tunneling system are adopted to compare and select the mud admixture and to analyze the influence of the admixture amount and the formation composite ratio on the slurry relative density. Then, the mud permeability law and the dynamic and static mud film forming law under different formation composite ratios, swelling water ratios and slag dosages are analyzed comprehensively by factorial design. The results show that different admixtures have significant influence on the properties of bentonite slurry. Specifically, potassium methyl silicate and potassium chloride can effectively reduce the relative density of slurry, while sodium chloride and sodium silicate can promote the disintegration of mudstone in water. In addition, the slag admixture can effectively reduce the water filtration, improving the film quality and reducing the consumption of bentonite. When the cutter head speed is less than or equal to 2.5 r/min, the formation rate of mud film is greater than or equal to the failure rate so as to ensure the stability of driving face. The mud swelling water ratio suitable for mudstone and gravel composite stratum (composite ratio: 0?1) is 0.1?0.20, the residue content is 100?200 g/kg, and the potassium methyl silicate is 3.75%?7.50%.  相似文献   

Stratigraphy and depositional setting of slurry and contained (reflected) beds in the Marnoso‐arenacea Formation (Langhian‐Serravallian) Northern Apennines,Italy     

PIERRE MUZZI MAGALHAES  ROBERTO TINTERRI 《Sedimentology》2010,57(7):1685-1720

This work presents the stratigraphy and facies analysis of an interval of about 2500 m in the Langhian and Serravallian stratigraphic succession of the foredeep turbidites of the Marnoso‐arenacea Formation. A high‐resolution stratigraphic analysis was performed by measuring seven stratigraphic logs between the Sillaro and Marecchia lines (60 km apart) for a total thickness of about 6700 m. The data suggest that the stratigraphy and depositional setting of the studied interval was influenced by syndepositional structural deformations. The studied stratigraphic succession has been subdivided into five informal stratigraphic units on the basis of how structurally controlled topographic highs and depocentres, a consequence of thrust propagation, change over time. These physiographic changes of the foredeep basin have also been reconstructed through the progressive appearance and disappearance of thrust‐related mass‐transport complexes and of five bed types interpreted as being related to structurally controlled basin morphology. Apart from Bouma‐like Type‐4 beds, Type‐1 tripartite beds, characterized by an internal slurry unit, tend to increase especially in structurally controlled stratigraphic units where intrabasinal topographic highs and depocentres with slope changes favour both mud erosion and decelerations. Type‐2 beds, with an internal slump‐type chaotic unit, characterize the basal boundary of structurally controlled stratigraphic units and are interpreted as indicating tectonic uplift. Type‐3 beds are contained‐reflected beds that indicate different degrees of basin confinement, while Type‐5 are thin and fine‐grained beds deposited by dilute reflected turbulent flows able to rise up the topographic highs. The vertical and lateral distribution of these beds has been used to understand the synsedimentary structural control of the studied stratigraphic succession, represented in the Marnoso‐arenacea Formation by subtle topographic highs and depocentres created by thrust‐propagation folds and emplacements of large mass‐transport complexes.  相似文献   

黔东地区下江群凝灰岩锆石SHRIMP U-Pb年龄及其地层意义   总被引：8，自引：2，他引：6       下载免费PDF全文

高林志戴传固  刘燕学王 敏王雪华  陈建书丁孝忠 《中国地质》2010,37(4):1071-1080

本文报道黔桂地区晚前寒武纪下江群沉积地层凝灰岩(斑脱岩)获得高精度的锆石年龄,结合侵位四堡群花岗岩锆石年龄和四堡群斑脱岩锆石SHRIMP U-Pb年龄,将下江群明确定位于新元古代晚期沉积。该年龄对为重新界定下江群时代及同期地层的区域对比和构造演化都有着重要意义。江南古陆普遍发育的晚元古代低变质绿片岩系四堡群(梵净山群、冷家溪群、双桥山群)及上覆地层丹州群(下江群、板溪群、河上镇群),两者之间的构造界面,是人们争论的主题,其时代的定位一直影响着整个江南古陆变质基底的地层划分和对比,同时制约着中国地质学家对江南造山带的地质背景和成矿条件解疑。本文通过下江群甲路组地层中斑脱岩的锆石研究,精确地测定了甲路组斑脱岩锆石年龄(814.0±6.3)Ma和清水江组斑脱岩锆石年龄(773.6±7.9)Ma。上述锆石年龄解决了黔桂地区新元古代晚期沉积时代问题。  相似文献   

注浆护壁堵漏工艺在深孔岩心钻探中的应用          下载免费PDF全文

张成德 《探矿工程》2010,37(5):25-26

简述了深孔岩心钻探破碎岩层护壁堵漏的重要性,注浆参数选择,水泥浆配比、速凝剂掺量的掌握,注浆施工中需把握的几个技术环节及注意事项,注浆施工经验总结及注浆效果评价等。  相似文献   

射流式水泥浆液制造器的研究     

王秋玲 《中国煤炭地质》2010,(5):74-76

在分析人工造浆阶段和风动造浆阶段原理及优缺点的基础上,开发研制出射流式水泥液制造器。通过对该设备主要构成部分结构的介绍,说明了其工作原理和使用方法。焦煤集团九里山矿14101工作面和古汉山矿11092(西)工作面的堵水实践证明,该设备的堵水率为100%,不仅可以提高注浆的速度及质量,降低劳动强度,改善注浆工地环境条件,而且具有价格便宜、设备安装简便、操作简单、容易维护,不受场地、注浆量大小、注浆点远近的限制等优点。  相似文献   

仇山酸化钙基膨润土的 27Al和 29Si 魔角旋转核磁共振谱及脱色率研究   总被引：1，自引：0，他引：1  

何宏平  郭九皋  王德强  林鸿福  杨年华  杨保联  李丽云 《地球化学》2001,30(5):470-476

对用不同酸度处理的仇山钙基膨润土进行了化学分析、X射线衍线（XRD）、^27Al和^29Si魔角旋转核磁共振（MAS NMR）、吡啶吸附样品的红外光谱（IR）、比表面积、阳离子交换容量（CEC）和脱色率等测定。结果表明，随着处理酸度的增加和蒙脱石中阳离子的溶出，它的d(001)的衍射强度降低，同时其Si和Al原子局域结构环境发生了显著的改变，Al原子由Al^Ⅵ变成Al^Ⅵ，Si原子由Q^Si(0Al)结构向Q^4Si(0Al)和Q^3Si(1OH)结构转变。八面体片阳离子的溶出和Si,Al原子局域结构环境的转变，显著地增加了比表面积和孔结构；Al^Ⅵ向Al^Ⅵ的转变形成了Lewis酸中心，而Si原子局域结构环境的改变形成了Br φnsted酸中心。膨润土脱色率随处理酸度增加的本质原因是在Si和Al原子局域环境的变化过程中，在其表面分别形成了Brφnsted酸中心和Lewis酸中心。  相似文献   

酸化条件对膨润土结构和脱色性能的影响     

蒋引珊  徐长跃  雷美玲 《吉林大学学报(地球科学版)》1995,(4)

本项研究对不同酸度、不同时间条件下处理的膨润土进行了脱色力、比表面积、活性膨润土中硅铝比分析及扫描电镜测试，由此，总结出控制获得高效活性膨润土的最佳条件应是使比表面积尽可能大，硅铝比尽量高。在适当控制酸度情况下，可以通过调整活化处理时间来取得较理想的性能。  相似文献   

刘房子盆地沉积环境及煤和膨润土赋存规律     

王嘹亮  胡善亭 《吉林大学学报(地球科学版)》1993,(3)

刘房子盆地为松辽盆地东缘～断陷型盆地。盆内充填晚中生代陆相碎屑岩含煤建造,富含煤、膨润土。大羊草沟组为主要含煤层位;主要可采煤层形成于曲流河体系的岸后沼泽;钠基膨润土系河流搬运至浅水湖泊与沼泽中沉积成因;刘房子盆地的演化,既具区域发展的共性,又有其自身的特点。本文在综合分析基础上提炼出网结河体系与曲流河体系的聚煤模式;总结了煤和膨润土的赋存规律;并指明进一步勘探、开发、利用方向。  相似文献