水敏性地层钻探用接枝淀粉聚合物泥浆体系研究

以接枝淀粉共聚物为降失水荆,选择抑制荆、防塌剂、润滑剂、包被剂、膨润土等处理剂,优化设计了水敏性地层用接枝淀粉聚合物泥浆体系。经过测试,该体系的API失水为7ml,相对膨胀降低率84．2％,岩屑回收率92％,摩阻系数0．07。该体系在水敏性地层的钻探施工中取得了良好的使用效果。     

淮南矿区新集二矿1煤地面排水钻孔的设计施工

新集二矿的主采煤层位于山西组的底部,受到下伏太原组岩溶裂隙含水层的威胁。为缓解井下的防治水压力．采用了在地面施工排水孔的防治水思路。根据钻孔的位置及地层情况,采用了泥浆循环钻进与空气潜孔锤钻进相结合的方法。由于在钻孔施工过程中,发生了泥浆向巷道渗漏的情况,为保证钻孔施工安全及井下生产安全而对钻孔设计深度进行了调整,从而顺利的完成了该孔的钻探施工任务。此孔的成功,可为类似地区施工矿井防治水钻探工程提供借鉴。     

缅甸兰里岛泥火山灾害与成因机制探讨

文中主要探讨缅甸兰里岛泥火山灾害与成因机制,结合兰里岛地质背景以及泥火山活动现状,对在兰里岛东北部、中部以及西部所取3个泥火山采样点的样品进行粒度分析以及显微形貌分析,发现样品粒度在1～100μm之间,均呈单峰正态分布,粒径中值相近,粒度分布集中,分选较差,粒度对称程度呈很正偏态;样品基质以泥质为主含有大量泥质碎屑、细...     

Removal of Organochlorine Pesticides from Aqueous Solution by Using Neutralized Red Mud

This work describes the potential usability of neutralized red mud for the removal of organochlorine pesticides (OCPs) from aqueous solutions. After examination on the adsorption capability of neutralized red mud for all studied OCPs, the experiments were performed by employing aldrin as a model compound. The effect of several parameters, such as contact time, pH of the solution, initial aldrin concentration, and dosage of the adsorbent was evaluated by batch experiments. The determination of OCPs was carried out using traditional liquid–liquid extraction followed by a GC coupled with µ‐electron capture detector (GC‐µECD). The results showed that adsorption equilibrium time depended upon the initial aldrin concentration and adsorption followed the second‐order kinetic model. Kinetic study also indicated that the film diffusion mechanism was a main rate control mechanism. The removal was explained by considering the electrostatic interactions between metal oxides surface of the neutralized red mud and inductively charged centers (negative charge (d?) of chlorine atoms and positive charge (d+) of π‐cloud aromatic ring) of the aldrin molecules. In comparison to the Langmuir isotherm model, the Freundlich model better represented the adsorption data. The neutralized red mud was also succesfully employed for the removal of OCPs from real water samples, including tap water and surface (lake) water, fortified with studied OCPs.     

栾川县多金属矿复杂地层岩心钻探技术

栾川县多金属成矿区处于马超营大断裂带中,区内4条大断裂横贯全区,主、次级构造极为发育。因碎裂蚀变带、泥质砂砾岩等松散破碎地层而引发的孔内坍塌、取心困难等钻进难题此起彼伏,软硬互层变化频繁,对钻头要求高、选择性强。而且钻孔结构复杂,生产效率难提高,多数钻孔施工中均出现程度不同的夹钻、埋钻、断钻、烧钻等孔内事故,给钻探施工带来很大困难。通过改善冲洗液性能、采用JS122绳索取心钻具,并进行钻头与地层适应性研究,取得了较好成效。     

砂卵石地层中防渗墙槽壁稳定性影响因素研究

地下连续墙或防渗墙施工中槽孔的开挖是极其重要的分项工程,泥浆护壁条件下槽壁的稳定性影响因素很多．应用ABAQUS有限元软件,考虑泥浆的渗透,模拟计算不同密度的泥浆以及泥浆分层后槽壁的位移,对槽壁的稳定性进行分析．经对槽壁位移值的分析得到泥浆密度增大槽壁的位移随之减小以及减小的幅度,随着泥浆的沉淀,槽壁位移增大．研究可为...     

鸡西盆地城子河组泥岩有机质保存条件研究

鸡西盆地作为我国东北地区重要的煤炭基地,已在多口钻井中发现油气显示。早白垩世城子河组为一套夹数个海相泥岩层的含煤岩系,形成于滨浅湖—沼泽的沉积环境,为该盆地主力烃源岩层。本次对该层位泥岩样品的常、微量元素全分析结果表明,水体盐度指标Sr/Ba在0.11～0.38之间,碱度指标（Ca＋Mg）＊20/（Si＋Al）为0.2...     

Differences in the neighborhood: Structural variations in the carapace of shore crabs Carcinus maenas (Decapoda: Portunidae)

The present study compared the carapace structure of Carcinus maenas in two nearby sites (2 km apart) within Minho estuary, submitted to different physicochemical and ecological conditions (water temperature, pH, crabs’ density and sex ratio). The carapace structure of the carapace and chelae of the crabs presented significant differences between sampling sites (t-test; p < 0.01). The SIMPER analysis revealed that the Weight/CW and Thickness/CW ratios explained all the dissimilarities found among sites. Overall, the male carapace was proportionally thicker at station 2 (t-test; p < 0.01), while the female carapace was proportionally thicker at station 1 (t-test; p < 0.001). A thicker carapace can be advantageous when competing for food or a sexual partner. We hypothetized that, since at station 2, the density of individuals was twice higher than at station 1, it is likely that agonistic encounters are more frequent, thus favouring a thicker carapace.     

巨厚松散层裸孔施工技术措施

针对巨厚松散层在钻孔施工中易出现钻孔孔壁坍塌、掉块、缩径,造成埋钻、粘钻、卡钻,找不到原孔而形成岔孔等钻孔事故,简述了在巨厚松散层钻孔裸孔安全施工的要点和注意事项。     

基岩水井采用泡沫潜孔锤钻进实践

通过对甘肃肃北七角井铁矿区0310mm口径基岩水井空气泡沫潜孔锤钻进施工,总结验证了空气泡沫潜孔锤钻进施工大口径基岩水井的工艺,提出了不同孔段的钻进技术措施。