旋流除砂机理研究及自动旋流除砂器的开发          下载免费PDF全文

张学强  鄢泰宁 《探矿工程》2008,35(11):34-36

旋流除砂技术是利用离心力从泥浆中分离固相成分的技术,可广泛应用在地质钻探、有色、冶金工业及石油天然气工业领域。研制开发的自动旋流除砂器弥补了传统除砂器固相成分分离效果不佳、排砂口易堵的缺陷,显著提高泥浆或矿浆的净化质量与除砂效率,且能自动排堵,降低了除砂工作的时间消耗和成本。  相似文献   

高砂性地层钻孔灌注桩施工易发的基桩质量隐患          下载免费PDF全文

徐佩林  彭家驹  徐建忠 《探矿工程》2008,35(6):58-62

结合杭州钱江新城某广场基桩工程,在分析高砂性地层自然造浆性的基础上,介绍了高砂性地层中钻孔灌注桩施工易发的基桩质量隐患,并分析了其产生原因。  相似文献   

预防油页岩地层钻进中压差卡钻的措施     

赵宪富  台沐礼  孙德学  张元清  吕洪富 《探矿工程》2008,35(9):21-23

分析了油页岩地层钻进中压差卡钻发生的原因,提出了预防压差卡钻的途径及处理方法,并通过工程实例来强调预防为主的重要性。  相似文献   

土壤聚合物对几种重金属离子固化效果的研究   总被引：2，自引：0，他引：2  

金漫彤  楼敏晓  张琼  王连军 《矿物学报》2008,28(1):66-70

土壤聚合物是一种新型的无机聚合物,其分子链由Si、O、Al等以共价键或离子键连接而成,形成网络结构,对重金属有较强的固定作用.本文试图利用土壤聚合物固化铜、锌、铅三种重金属离子,实现资源化利用.实验以固化体抗压强度和浸出毒性作为性能表征量,结果表明:土壤聚合物对不同重金属的固化有各自的极限浓度,Cu2 、Zn2 、Pb2 的理想固化量分别为0.9%、1%、2%;若固化过程中添加一定量的高炉矿渣,则可以提高固化体的抗压强度.本文通过土壤聚合物固化体SEM分析,从固化体微观结构的形态来阐述土壤聚合物宏观上的优越表现.  相似文献   

水溶液中聚合物在粘土上的吸附          下载免费PDF全文

王修林 《海洋与湖沼》1993,24(4):420-427

水溶液中聚合物在粘土上的吸附对于聚合物污染防治和污水处理等都有重要意义。Scheutjens-Fleer理论是应用范围最广的聚合物吸附理论,适应于从单体到长链高聚物,从链无相互作用的稀溶液到纯聚合物的吸附研究。本文简要介绍了有关聚合物吸附的重要参数,包括吸附量、耦合分数或直接表面覆盖、平均层厚度和链段密度,以及相应的测定方法。文中分析了影响聚合物吸附研究发展的主要问题,指出水溶液中聚合物在粘土上的吸附研究的发展方向是综合研究吸附等温线和A/V效应、耦合分数、吸附层厚度、吸附分级现象和对粘土层间的影响,并与Scheutjens-Fleer理论计算结果进行比较。  相似文献   

In-Situ Observation of Fluid Mud in the North Passage of Yangtze Estuary, China   总被引：1，自引：0，他引：1  

李九发  万新宁何青应铭  时连强S.M.Hutchinson 《中国海洋工程》2004,18(1):149-156

Observations of fluid mud were made in the lower North Passage of the Yangtze Estuary in February 2000, on 10 -11 August 2000, on 30 - 31 August 2000 (after two strong typhoons), on 21 - 24 August 2000 (neap tide) and on 3 -6 September 2000 (mean tide) respectively. In situ data show that the fluid mud in this area consists of fine cohesive sediment (median size 7.23 μm). The formation and movement of fluid mud varied during the neap-spring and flood-ebb tidal cycle. Observations suggest that fluid mud phenomena in this area may be categorised in a three-fold manner as slack water, storm and saltwedge features. The thickness of the fluid mud layer of slack water during the neap tide ranged from 0.2 to 0.96 m, whereas during the mean tide, the thickness ranged from 0.17 to 0.73 m, and the thickness of the fluid mud layer was larger during slack water than at the flood peak. Shoals cover an area of 800 km^2 with a water depth smaller than 5 m. Erosion of these extensive intertidal mudflats due to storm action provides an abundant sediment source. This is particularly significant in this estuary when the tidal level is lower than 5 m. The lower North Passage is a typical zone of saltwater wedging, so the saltwedge fluid mud has the most extensive spatial range in the estuary.  相似文献   

泥浆性能对定向钻进铺管孔壁稳定性的影响     

黄光明 《岩土钻凿工程》2008,(3):8-11

本文通过对泥浆性能的分析,特别是对泥浆流变参数的控制与调节在定向钻进非开挖铺管中的作用及其护壁原理的分析,简要阐述了泥浆性能对定向钻进铺管孔壁稳定性的影响,对非开挖定向钻进铺管施工有一定的指导意义。  相似文献   

低阻油层的电测井资料反演与动态侵入模拟   总被引：1，自引：0，他引：1  

王晓畅  邓少贵  范宜仁  杨震  周凤鸣 《物探化探计算技术》2008,30(4):278-281

高矿化度钻井液侵入是造成油层低电阻的重要因素之一,泥浆滤液侵入越深,对测井结果影响越大,甚至造成解释错误或油层漏失.采用非线性最小二乘原理进行电测井反演预处理,并将其同以多相流渗流、对流扩散理论为基础的电测井动态模拟相结合,能更加真实地反映动态侵入特点,获取原状地层真电阻率和流体饱和度,从而有效地改善低电阻率油气层电测井资料的有效性,为低电阻率油层的识别和评价提供可靠的依据.  相似文献   

胞外聚合物EPS组成及对污泥特性的影响研究     

赵军  徐高田  秦哲  官春芬 《地质勘探安全》2008,15(1):66-70

综述了进水基质、溶解氧（DO）、pH、污泥停留时间（SRT）和污泥负荷（Ns）对EPS组成的影响,分析了EPS对污泥的表面特性（污泥混合液疏水性、Zeta电位等）、生物絮凝沉降性、脱水性及吸附再生性能的影响,并通过控制适当的条件,改善EPS组成,形成良好的活性污泥,能使之更好的发挥作用。  相似文献   

High-resolution sedimentary record of lead in the coastal mud of the East China Sea in the past one hundred and fifty years     

Yunchao HAO Zhigang GUO Dejiang FAN 《中国地球化学学报》2006,25(B08):13-13

In the East China Sea （ECS）, there are some mud areas, including the south coastal mud area, the north coastal mud area, and the mud area to the southwest of Cheju Island. X-ray fluorescence （XRF） techniques and Thermal Ionization Mass Spectrometry （TIMS） were used to study the high-resolution sedimentary record of Pb concentrations and Pb stable isotopic compositions in the past one hundred and fifty years in the coastal mud of the ECS. Pb concentrations of a ^210Pb dating S5 core in the study area have increased rapidly since 1980, and reached the maximal value with 65.08 μg/g in 2000, corresponding to the fast economic development of China since the implementation of the ＂Reform and Open Policy＂ in 1978; ^206Pb/^207Pb ratios generally had stabilized at 1.195 from 1860 to 1966, and decreased gradually from 1966 to 2000, indicating that the anthropogenic source Pb contribution to the ECS has increased gradually since 1966, especially since 1980. Pb concentrations decreased distinctly from 2000 to 2003 and ^206Pb/^207Pb ratios increased from 2001 to 2003, corresponding closely to the ban of lead gasoline from 2000 in China. From 1950 to 2003, there occurred four distinct decrease events of ^206Pb/^207Pb, possibly responding to the Changjiang River （Yangtze River） catastrophic floods in 1998, 1991, 1981 and 1954; from 1860 to 1966, there were two decrease periods of ^206Pb/^207Pb, which may respond to the catastrophic floods of Changjiang River in 1931 and 1935, and 1870. As a result of the erosion and drowning by the catastrophic floods, the anthropogenic lead accumulated in soil and water environments over a long period of time was brought into the Changjiang River, then part of them was finally transported into the ECS, which leads to changes in Pb stable isotopic composition.  相似文献