Based on the Dikken analytical calculation method of wellbore pressure loss under single-phase fluid and turbulent flow conditions, the correlation model between horizontal well output and horizontal section length an...Based on the Dikken analytical calculation method of wellbore pressure loss under single-phase fluid and turbulent flow conditions, the correlation model between horizontal well output and horizontal section length and horizontal section distributed pressure difference is constructed. The influence degree of wellbore pressure loss on daily oil production of horizontal well, horizontal section pressure and production effect of horizontal well under different horizontal well lengths is analyzed, which provides certain reference for the design of horizontal well length and well layout.展开更多
In the construction of horizontal wells, different drilling assembly, drilling parameters, drilling fluid system and directional control technology are selected for different intervals, and wireless tracking monitorin...In the construction of horizontal wells, different drilling assembly, drilling parameters, drilling fluid system and directional control technology are selected for different intervals, and wireless tracking monitoring while drilling is adopted to adjust the bit position at any time to control the well trajectory. According to the geological logging, engineering logging and physical logging data, the formation encountered was judged, and the purpose of safe and efficient drilling was achieved.展开更多
Damage statistical mechanics model of horizontal section height in the top caving was constructed in the paper. The influence factors including supporting pressure, dip angle and characteristic of coal on horizontal s...Damage statistical mechanics model of horizontal section height in the top caving was constructed in the paper. The influence factors including supporting pressure, dip angle and characteristic of coal on horizontal section height were analyzed as well. By terms of the practice project analysis, the horizontal section height increases with the increase of dip angle β and thickness of coal seam M. Dip angle of coal seam β has tremendous impact on horizontal section height, while thickness of coal seam M has slight impact. When thickness of coal seam is below 10m, horizontal section height increases sharply. While thickness exceeds 15m, it is not major factor influencing on horizontal section height any long.展开更多
In mathematical geometry data, we can know through demonstration that after a smooth curve meets a straight line, the other curve will still be smooth. The ideal condition of asphalt pavement is to form a smooth curve...In mathematical geometry data, we can know through demonstration that after a smooth curve meets a straight line, the other curve will still be smooth. The ideal condition of asphalt pavement is to form a smooth curve (vertical section) which is completely consistent with the design vertical section curve. Of course, due to various objective conditions, this ideal situation cannot be achieved. In the actual construction, what is more considered and implemented is "approximately parallel or basically consistent", that is, most road sections are parallel to the design profile curve, and a small number of transition sections are used to adjust them. The purpose of "parallel" is for flatness and ride comfort, and the purpose of "transition section" is to properly control the thickness. If the transition section can be "smoothly transitioned", flatness and thickness can be considered.展开更多
文摘Based on the Dikken analytical calculation method of wellbore pressure loss under single-phase fluid and turbulent flow conditions, the correlation model between horizontal well output and horizontal section length and horizontal section distributed pressure difference is constructed. The influence degree of wellbore pressure loss on daily oil production of horizontal well, horizontal section pressure and production effect of horizontal well under different horizontal well lengths is analyzed, which provides certain reference for the design of horizontal well length and well layout.
文摘In the construction of horizontal wells, different drilling assembly, drilling parameters, drilling fluid system and directional control technology are selected for different intervals, and wireless tracking monitoring while drilling is adopted to adjust the bit position at any time to control the well trajectory. According to the geological logging, engineering logging and physical logging data, the formation encountered was judged, and the purpose of safe and efficient drilling was achieved.
基金This work was financially supported by the National Natural Science fund of China (No.50274058).
文摘Damage statistical mechanics model of horizontal section height in the top caving was constructed in the paper. The influence factors including supporting pressure, dip angle and characteristic of coal on horizontal section height were analyzed as well. By terms of the practice project analysis, the horizontal section height increases with the increase of dip angle β and thickness of coal seam M. Dip angle of coal seam β has tremendous impact on horizontal section height, while thickness of coal seam M has slight impact. When thickness of coal seam is below 10m, horizontal section height increases sharply. While thickness exceeds 15m, it is not major factor influencing on horizontal section height any long.
文摘In mathematical geometry data, we can know through demonstration that after a smooth curve meets a straight line, the other curve will still be smooth. The ideal condition of asphalt pavement is to form a smooth curve (vertical section) which is completely consistent with the design vertical section curve. Of course, due to various objective conditions, this ideal situation cannot be achieved. In the actual construction, what is more considered and implemented is "approximately parallel or basically consistent", that is, most road sections are parallel to the design profile curve, and a small number of transition sections are used to adjust them. The purpose of "parallel" is for flatness and ride comfort, and the purpose of "transition section" is to properly control the thickness. If the transition section can be "smoothly transitioned", flatness and thickness can be considered.
