A novel temperature-tolerant foamed resin for enhanced oil recovery

The synthesis and performance of a novel temperature-tolerant foamed resin for enhanced oil recovery were investigated using various methods, including infrared, NMR, scanning electron microscopy (SEM), and displacement experiments. Polycondensation of furfuryl alcohol prepolymers was confirmed by the infrared and NMR results. The poor temperature tolerance of furfuryl alcohol prepolymers after gelation at high temperatures is mainly due to the fracture of furan rings. The addition of ester additives is an effective method of increasing the temperature tolerance of the prepared foamed resins and can effectively reduce the weight-loss rate of the polycondensation products. The SEM results show that the skeleton structure of the foamed resin remains intact after high-temperature treatment. Thus, the novel plugging agent system has excellent thermal stability and still has a high strength (>0.8 MPa) after high-temperature aging treatment for 40 days, giving the prepared foamed resin a good plugging performance (plugging rate > 91%) at 250 °C. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47161.     

基于高光谱数据和雷达融合的滑坡信息提取

为了改进微地形滑坡遥感影像分类技术,从而提高微地形滑坡遥感信息提取的精度,采用湖北宜昌部分地区的无人机航拍高光谱影像(HSI)和激光雷达(LiDAR)数据作为研究数据源,并对高光谱和LiDAR数据进行融合,最后采用结合注意力模块(CBAM)的卷积神经网络(CNN)方法,对融合后的数据进行滑坡信息提取。研究表明,利用高光谱和雷达数据的优势,可以更准确地提取滑坡信息。     

注气井井筒结垢预测研究

在油田开发过程中,油、气、水和泥浆在地层或管道中流动,当达到一定条件时,油垢、水垢或泥垢便会产生。在实际生产过程中,油垢和泥垢通常伴随着水垢而生成,所以对水垢结垢趋势的预测研究显得至关重要。介绍了Oddo-Tomos饱和指数法的理论预测模型,以及在生产过程中利用Oddo-Tomos饱和指数法预测油田结垢趋势的方法,阐述并分析了油田结垢对油田开采的影响。研究结果可为下一步的生产作业提供理论依据。     

Cadmium in agricultural soils,vegetables and rice and potential health risk in vicinity of Dabaoshan Mine in Shaoguan,China

Soil cadmium （Cd） contamination resulted from mining and smelting is a major environmental concern,and health risk associated with Cd exposure to multi-media through muti-pathway is increasing.Cd concentrations in soils,vegetables and paddy rice were investigated,and potential non-carcinogenic and carcinogenic health risks exposure to Cd were estimated at six villages around the Dabaoshan Mine,South China.A total of 87 soil samples were found to exceed the China＇s maximum permission level （MPL） for Cd,while the highest value of 4.42 mg/kg was found near irrigation ditch associated with Hengshi River in Xinyi （XY） Village.Cd contents in vegetables and rice exceeded the maximum permissible concentration by more than five times in every village.Cadmium accumulation in plants is in the order of celery 〉 lactuca sativa L 〉 Chinese cabbage 〉 Romaine lettuce 〉 asparagus lettuce 〉 mustard 〉 cabbage mustard 〉 cabbage.The mean hazard quotient （HQ） of all villages is in the range of [5.29,25.75],and the mean values of cancer risk for investigated areas are more than 10 times greater than the USEPA （2009） threshold limit value of 10-4.Moreover,human non-carcinogenic and carcinogenic risks are mainly attributable to paddy rice intake,followed by vegetables intake,soil ingestion,inhalation,and dermal contact.The results indicate that Cd has a huge potential risk on human health for the local residents.     

基于Petrel软件的复杂断块精细建模——以老爷庙油田东一段为例

建立储层地质模型是现代油藏描述的核心和关键,它将地质上的认识用一定的数学地质方法在模型中进行预测与表征。通过构造建模,相建模和物性建模建立地质模型。构造建模是通过工区内顶底层的断层建立构造骨架模型;在精细网格骨架下以确定性的方法建立老爷庙油田的沉积相模型;通过沉积相的约束,利用序贯高斯模拟方法建立老爷庙油田的物性参数模型。建立的精细地质模型比较好的反应了地下储层的三维空间展布特征,为后期开发方案的制定提供数据体。     

银—额盆地石炭—二叠纪以来的构造演化及其残余地层分布

通过对银—额盆地内现有二维地震资料的精细解释,并结合前人研究成果与认识,将研究区石炭—二叠纪及其之后的构造演化划分为5个阶段:石炭纪—二叠纪裂谷、裂陷构造演化阶段;晚二叠世—三叠纪挤压隆升构造阶段;侏罗纪—白垩纪陆内小型断陷盆地构造演化阶段;晚白垩世末期逆冲推覆构造阶段;古近纪—新近纪盆地分割与局部断陷阶段。在此基础上,通过对研究区石炭—二叠纪残余地层进行精细层位对比追踪,获得了石炭—二叠系的区域分布与埋深,为银—额盆地油气勘探提供借鉴。     

酸气回注方案关键技术研究

酸气回注是一种安全环保的酸气处理方式,其原理是将酸气压缩后通过井筒回注到已废弃的产层或水层中.基于酸气不同组分的相平衡机理进行酸气回注方案设计,分析不同相态的输送方式,结合酸气脱水、增压、管线腐蚀和水合物防止等关键工艺技术,优选合理的回注工艺参数.     

江汉白垩系断陷盆地冲积扇沉积储层预测方法优选

对江汉白垩系冲积扇沉积储层进行模式识别及定性预测,从振幅、波阻抗、速度三种方法预测结果比较分析看,速度反演结果更可信、更可靠,速度反演为该区白垩系储层预测的主要敏感参数,对江汉白垩系下步勘探有重要指导作用。结合钻后效果分析,认为速度反演更能有效区分砂、砾岩,是白垩系冲积扇储层预测最有效手段之一。     

Effect of fly ash fineness on compressive strength and pore size of blended cement paste

This paper presents an experimental investigation on the effect of fly ash fineness on compressive strength, porosity, and pore size distribution of hardened cement pastes. Class F fly ash with two fineness, an original fly ash and a classified fly ash, with median particle size of 19.1 and 6.4 μm respectively were used to partially replace portland cement at 0%, 20%, and 40% by weight. The water to binder ratio (w/b) of 0.35 was used for all the blended cement paste mixes.Test results indicated that the blended cement paste with classified fly ash produced paste with higher compressive strength than that with original fly ash. The porosity and pore size of blended cement paste was significantly affected by the replacement of fly ash and its fineness. The replacement of portland cement by original fly ash increased the porosity but decreased the average pore size of the paste. The measured gel porosity (5.7–10 nm) increased with an increase in the fly ash content. The incorporation of classified fly ash decreased the porosity and average pore size of the paste as compared to that with ordinary fly ash. The total porosity and capillary pores decreased while the gel pore increased as a result of the addition of finer fly ash at all replacement levels.