To improve the rate of penetration(ROP) in drilling deep and hard formations, this paper proposes a new drilling method called coiled tubing partial underbalanced drilling(CT-PUBD). As a preliminary investigation into...To improve the rate of penetration(ROP) in drilling deep and hard formations, this paper proposes a new drilling method called coiled tubing partial underbalanced drilling(CT-PUBD). As a preliminary investigation into the new drilling method, this paper presents predictions of hole cleaning efficiency, drilling speed, cuttings migration and pressure loss in the drilling process with CT-PUBD. Based on numerical simulation and full-scale experimental studies, we conclude that using CT-PUBD, an underbalanced drilling condition can be achieved near the bit while maintaining wellbore safety at the same time. This condition can be achieved using a cuttings discharge device, a rotary packer and a backflow controller.According to the numerical simulations performed in this study, CT-PUBD can achieve high efficiency of hole cleaning.Along the cuttings migration process, the fluid velocities can reach the maximum values in the backflow holes. A full-scale laboratory experimental system was used to test the hydraulic characteristics and obtain the drilling performance of the new technology. The result shows that CT-PUBD significantly improves the ROP compared to the conventional drilling method.展开更多
阐述英语学科核心素养、UbD理论、大概念单元教学等相关概念。分析大概念单元教学要解决的问题。归纳在大概念单元教学中运用UbD理论的意义。以牛津译林版(2020)高中《英语》选择性必修四Unit 1 Honesty and Responsibility的整体教学为...阐述英语学科核心素养、UbD理论、大概念单元教学等相关概念。分析大概念单元教学要解决的问题。归纳在大概念单元教学中运用UbD理论的意义。以牛津译林版(2020)高中《英语》选择性必修四Unit 1 Honesty and Responsibility的整体教学为例,进行UbD理论指导下的教、学、评一体化的整体教学说明。认为在UbD理论指导下,指向学科核心素养的大概念单元教学是深化课程改革、发展素质教育、落实立德树人目标的必然要求,也是学科核心素养落地的有效途径。展开更多
在职业教育数字化转型背景下,高职英语课程思政教学面临新挑战,亟须创新。文章以理解为先的逆向教学设计(Understanding by Design, UbD)理念为指导,探讨数字赋能高职英语课程思政教学模式的构建路径。通过明确预期学习结果、设计个性...在职业教育数字化转型背景下,高职英语课程思政教学面临新挑战,亟须创新。文章以理解为先的逆向教学设计(Understanding by Design, UbD)理念为指导,探讨数字赋能高职英语课程思政教学模式的构建路径。通过明确预期学习结果、设计个性化评价方式和构建数字化教学活动,建构基于UbD理念的数字化高职英语课程思政教学模式,并探索数字技术融入课程思政目标、创设真实情境任务、开展个性化评价的路径,以提升高职英语课程思政教学实效,促进教学模式改革。展开更多
Underbalanced drilling(UBD) is defined as a drilling operation in which circulating drilling fluid pressure is maintained to be lower than reservoir pore pressure.Underbalanced drilling may improve drilling efficiency...Underbalanced drilling(UBD) is defined as a drilling operation in which circulating drilling fluid pressure is maintained to be lower than reservoir pore pressure.Underbalanced drilling may improve drilling efficiency and enhance well productivity. Approximately 90%of the discovered fields in Iran are in carbonate reservoirs putting Iran as one of the largest carbonate producers in the world.Under-展开更多
UbD(Understanding by Design)逆向教学设计能有效促进学生从接受学习向理解学习转变。在小学数学综合与实践模块中,教师在结合UbD理论对模块内容进行教学设计时,应合理设计评估证据、注重融合多学科学习、注重真实情境的创设与信息技...UbD(Understanding by Design)逆向教学设计能有效促进学生从接受学习向理解学习转变。在小学数学综合与实践模块中,教师在结合UbD理论对模块内容进行教学设计时,应合理设计评估证据、注重融合多学科学习、注重真实情境的创设与信息技术的使用,以此促进学生知识迁移和应用能力的发展。展开更多
“环境影响评价”课程是高校环境类专业的核心课程,涉及各类生态热点问题。为充分发挥思政元素在专业课教学过程中的作用,结合UbD(understanding by design)模式将思政元素融入“环境影响评价”课程,并针对UbD模式的应用现状、设计思路...“环境影响评价”课程是高校环境类专业的核心课程,涉及各类生态热点问题。为充分发挥思政元素在专业课教学过程中的作用,结合UbD(understanding by design)模式将思政元素融入“环境影响评价”课程,并针对UbD模式的应用现状、设计思路、案例挖掘和效果评价等角度展开探讨。通过引导学生从全方位多角度分析、认识和理解环境影响评价工作的复杂性、挑战性及其涉及的利益关系与权衡因素,旨在确保教学目标的有效实现和学生专业素养的显著增强,培养具有爱国主义情怀和思辨能力,并能适应社会发展的高素质复合型专业人才。展开更多
基金the National Natural Science Foundation of China (Grant No. 51474232)the National Science and Technology Major Project (Grant No. 2016ZX05022)
文摘To improve the rate of penetration(ROP) in drilling deep and hard formations, this paper proposes a new drilling method called coiled tubing partial underbalanced drilling(CT-PUBD). As a preliminary investigation into the new drilling method, this paper presents predictions of hole cleaning efficiency, drilling speed, cuttings migration and pressure loss in the drilling process with CT-PUBD. Based on numerical simulation and full-scale experimental studies, we conclude that using CT-PUBD, an underbalanced drilling condition can be achieved near the bit while maintaining wellbore safety at the same time. This condition can be achieved using a cuttings discharge device, a rotary packer and a backflow controller.According to the numerical simulations performed in this study, CT-PUBD can achieve high efficiency of hole cleaning.Along the cuttings migration process, the fluid velocities can reach the maximum values in the backflow holes. A full-scale laboratory experimental system was used to test the hydraulic characteristics and obtain the drilling performance of the new technology. The result shows that CT-PUBD significantly improves the ROP compared to the conventional drilling method.
文摘阐述英语学科核心素养、UbD理论、大概念单元教学等相关概念。分析大概念单元教学要解决的问题。归纳在大概念单元教学中运用UbD理论的意义。以牛津译林版(2020)高中《英语》选择性必修四Unit 1 Honesty and Responsibility的整体教学为例,进行UbD理论指导下的教、学、评一体化的整体教学说明。认为在UbD理论指导下,指向学科核心素养的大概念单元教学是深化课程改革、发展素质教育、落实立德树人目标的必然要求,也是学科核心素养落地的有效途径。
文摘在职业教育数字化转型背景下,高职英语课程思政教学面临新挑战,亟须创新。文章以理解为先的逆向教学设计(Understanding by Design, UbD)理念为指导,探讨数字赋能高职英语课程思政教学模式的构建路径。通过明确预期学习结果、设计个性化评价方式和构建数字化教学活动,建构基于UbD理念的数字化高职英语课程思政教学模式,并探索数字技术融入课程思政目标、创设真实情境任务、开展个性化评价的路径,以提升高职英语课程思政教学实效,促进教学模式改革。
文摘Underbalanced drilling(UBD) is defined as a drilling operation in which circulating drilling fluid pressure is maintained to be lower than reservoir pore pressure.Underbalanced drilling may improve drilling efficiency and enhance well productivity. Approximately 90%of the discovered fields in Iran are in carbonate reservoirs putting Iran as one of the largest carbonate producers in the world.Under-
文摘“环境影响评价”课程是高校环境类专业的核心课程,涉及各类生态热点问题。为充分发挥思政元素在专业课教学过程中的作用,结合UbD(understanding by design)模式将思政元素融入“环境影响评价”课程,并针对UbD模式的应用现状、设计思路、案例挖掘和效果评价等角度展开探讨。通过引导学生从全方位多角度分析、认识和理解环境影响评价工作的复杂性、挑战性及其涉及的利益关系与权衡因素,旨在确保教学目标的有效实现和学生专业素养的显著增强,培养具有爱国主义情怀和思辨能力,并能适应社会发展的高素质复合型专业人才。