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- horizontal section top coal caving 水平分段放顶煤
- Rock movement law of horizontal section top coal caving in steep seam 急倾斜水平分段放顶煤开采岩移规律
- horizontal sectional top coal caving 水平分段放顶煤
- Testing study of cracked top coal caving for horizontal section top coal caving in steep seam 急斜水平分段放顶煤放煤实验研究
- Keywords horizontal section top coal caving;layer cranny;transfixion in the middle of holes;declined step distribution;collapse pit with deep groove; 水平分段放顶煤;离层裂隙;孔间贯通;台阶下降分布;深槽型塌陷坑;
- Keywords horizontal section top coal caving;layer cranny;transfixion in the middle of holes;collapse pit with deep groove; 水平分段放顶煤;离层裂隙;孔间贯通;深槽型塌陷坑;
- horizontal section top coal 水平分段放顶煤
- The movement of top coal and top roof is discussed with the data observed from the caving mining of deeply inclined thick coal seam with horizontal section in Zhaogezhuang colliery of Kailuan Group. 就开滦集团赵各庄矿在急倾斜厚煤层采用水平分段开采过程中的现场观测,探讨顶煤和顶底板运移。
- top coal caving in horizontal sectional seam 水平分段放顶煤
- Movement Rule of Top Roof and Top Coal in Horizontal Section Caving Mining in Deeply Inclined Thick Coal Seam 急倾斜厚煤层水平分段放顶煤开采顶板和顶煤运移规律研究
- An ordinary horizontal well consists of vertical section,curve section and horizontal section. 普通水平井轨迹由三部分组成:直井段,造斜段,水平段。
- This method, compared with horizontal section and vertical section, has smaller jobs, simpler calculations and more accuracies in the room work. 该方法与水平断面法和垂直断面法相比,内业工作量小,计算简单,精度可靠。
- When horizontal section is short, the water coning is formed in a short time, the two shoulders of the coning are steep and the oil/water interface deforms greatly. 采用水平井开发时,由于水平段较长,油藏内井筒附近生产压差较小,底水形成水脊,水脊脊进速度慢,见水时间推迟,提高了无水期产油量。
- This paper studies systematically the effects of wellbore diameter, wellbore trace, horizontal section length and eccentricity on production of horizontal well. 系统分析了水平井井眼尺寸、井眼轨迹、水平井水平段长度和偏心距对水平井产量造成的影响。
- The top coal broken mechanism and reasonable determination of caving coal heigh in caving coal faces are expounded. 主要阐述了放顶煤工作面顶煤破碎机理及放煤高度的合理确定;
- It is key problem to raise the top coal recovery rate of the fully mechanized sublevel caving mining. 提高顶煤放出率是综放开采的一个重大课题,预注水弱化顶煤是解决这一问题的有效方法之一。
- Practices have proved that quick advancing techniqe is applicable in isolated unmined area Comprehensive top coal caving face. 实践证明,孤岛综放工作面快速推进技术是可行的。
- In CTVE via A,B and C points,the indication rates of the malleus,the indus, the drum cape,the canalis facialis horizontal section,and the prominence of horizontal semicircular canals were prosperously 100%. 40例正常志愿者经选择的A、B、C点入路行CTVE中,锤骨、砧骨、鼓岬、面神经管水平段和外半规管隆凸显示率均为100%25;
- The caving of hard top coal of 4-2# coal seam in Tongchuan Jiaoping Coal Mining Area seriously impacts the production efficiency of the mine. 铜川焦坪矿区4-2%23煤层坚硬顶煤垮落破碎难题是严重影响矿井生产效益的"瓶颈"。
- Radial horizontal well is the most complicated one in horizontal well series,it has a major horizontal section and one or several branch sections. 辐向水平井是水平井系列中的高难度井,它除了有一段水平井段外,还有另外一条或多条分支井段。