宣东二矿Ⅲ3煤层突出预测敏感指标及临界值研究

从预测指标主要反映指标与突出主控因素一致,指标测值随工作面突出危险大小有明显变化两个方面定性分析,并应用"三率"分析法,确定钻孔瓦斯涌出初速度q和钻屑量S为宣东二矿Ⅲ3煤层三采区的敏感指标。通过对q值和S值设定不同临界值进行"三率"分析,确定钻孔瓦斯涌出初速度q临界值为5.0L/min,钻屑量S临界值为5.1kg。     

螺旋槽气体端面密封稳定性分析

采用直接数值模拟的方法联立求解螺旋槽气体端面密封的运动方程和动态雷诺方程,结合给定的密封参数条件,得到该螺旋槽气体端面密封的临界转速和临界转动惯量。在干气密封的设计和运行过程中,超过该临界值,系统将因失稳而导致泄漏。     

Analysis of petrophysical cutoffs of reservoir intervals with production capacity and with accumulation capacity in clastic reservoirs

Methodologies have been developed for calculating cutoffs of reservoir intervals with production capacity （RIPC） and reservoir intervals with accumulation capacity （RIAC） according to the types of pore throat structures and dynamic force by using data from petrophysical analysis, production tests and mercury injection. The data are from clastic reservoirs in the third member （Es3） and the fourth member （Es4） of the Shahejie Formation in the Shengtuo area on the North Slope of the Dongying Sag, Jiyang Depression, China. The method of calculating cutoffs of RIPC is summarized as follows： 1） determination of permeability cutoffs of RIPC; 2） classification of types of pore-throat structures according to mercury injection data and then relating porosity to permeability and determining the relationship between porosity and permeability according to each type of pore-throat structure; and 3） calculating porosity cutoffs of RIPC using established correlation between porosity and permeability according to the type of pore throat structure. The method of calculating cutoffs of RIAC includes： 1） establishing a functional relationship between oil-water interracial tension and formation temperature; 2） calculating limiting values of maximum connected pore-throat radii according to formation temperature and dynamic forces of each reservoir interval; 3） correlating permeability with maximum connected pore-throat radius and then obtaining permeability cutoffs of RIAC; and 4） calculating porosity cutoffs on the basis of permeability cutoffs according to specific correlations, suitable for the type of porethroat structure. The results of this study show that porosity and permeability cutoffs of clastic reservoirs decrease with depth. For a fixed permeability cutoff, the porosity cutoff of R1PC varies because the type of pore throat is different. At a fixed temperature, porosity and permeability cutoffs of RIAC decrease as dynamic force increases. For a fixed permeability cutoff of effective hydrocarbon accumulation, the porosity cutoff also varies with different types of pore throat.     

用加速老化方法推算硫化橡胶制品使用寿命

为了预测硫化橡胶制品的使用寿命,用其指导科研和生产,满足市场的需求,我们采用对硫化橡胶加速老化的方法,以此推算出其在常温下的参考使用年限。为了保证推算工作顺利进行,前期我们做了充分的准备,确定了推算依据和推算原理,并就性能及其临界值的选择和试样、试验温度、老化     

回归法预测片麻水层冻结井筒施工临界值的研究

针对采用帷幕冻结法井筒下部冰点位置难以精确估算而导致施工困难的问题,利用回归分析法从竖向和径向温度场变化规律分析,得出了冰点地层位置,确定了安全施工范围,简化了施工工艺,达到了井筒安全施工的目的,为淮南矿区冻结法施工井筒确定安全临界值提供了重要的参考依据。     

潘三矿11-2煤瓦斯突出预测敏感指标及临界值初步确定

通过对各突出预测指标物理意义和潘三矿11-2煤层瓦斯突出主导因素的分析,有重点地选择了突出预测指标,并对其在潘三矿11-2煤层6个煤巷掘进工作面进行了跟踪考察。然后对指标的考察结果进行"三率"分析,确定钻屑量指标S和钻孔瓦斯涌出初速度q为潘三矿11-2煤层的突出预测敏感指标。通过对钻屑量指标S和钻孔瓦斯涌出初速度指标q取不同假想临界值时进行"三率"分析,初步确定钻屑量指标S的临界值为6 kg/m,钻孔瓦斯涌出初速度q的临界值为4.2 L/m in。     

喷气涡流纺纱线细节产生机制分析

通过数值计算对喷气涡流纺喷嘴内部流场衰减规律进行探讨。讨论加捻腔中纤维的受力情况及涡流作用下的运动状况;建立倒伏在空心锭上的纤维自由端绕空心锭旋转的临界角速度与进入纱尾的纤维头端长度、纤维半径等参数间的函数关系,以临界角速度作为衡量纤维头端是否被抽拔的依据,解释喷气涡流纺落纤、成纱细节产生的原因。临界角速度随进入纱尾纤维头端长度的增加而增大;纤维半径越大,临界角速度越小,在同一喷嘴气压下,半径大的纤维纺纱时落纤、成纱细节较多;增加喷嘴气压对成纱强力有利,超过某临界值落纤、成纱细节增加,对成纱质量不利;增加喷嘴内部负压,适当减小前罗拉与空心锭的距离可减少落纤、细节的产生。     

白沙矿区预测煤层突出危险性单项临界值研究

对白沙矿区突出矿井的突出煤层进行突出危险性单项敏感指标研究,以指导生产,初步取得了一定成效。     

渣浆泵副叶轮的研究

通过对副叶轮的工作过程进行理论研究,补充遮断阻力和运行临界值的影响,使副叶轮的计算方式更具实用价值。     

突出预测指标K_1临界值的确定与应用

介绍了青山煤矿主要煤层所确定的突出预测指标K1 临界值以及使用该值进行防突预测预报的效果