For the question of applying high-pressure water injection to increase gas extraction efficiency by increasing the permeability of water to drive gas action, an independently designed gas desorption experimental measu...For the question of applying high-pressure water injection to increase gas extraction efficiency by increasing the permeability of water to drive gas action, an independently designed gas desorption experimental measuring device was used under the condition of external solution invasion. The law of water effect on gas desorption was obtained after water invasion through experiment for the first time. The results show that water＇s later invasion not only can make the quantity of gas dcsorp- tion greatly reduced, but also can make gas desorption end early. Therefore, when evaluating the applications of high-pressure water injection to increase gas extraction efficiency, we should take water damaging effects on gas desorption into account.展开更多
In order to detecting and tracking along the weld seam with rotating arc sensor in underwater welding,the highpressure water environment rotating arc welding hardware platform is established and welding experiments us...In order to detecting and tracking along the weld seam with rotating arc sensor in underwater welding,the highpressure water environment rotating arc welding hardware platform is established and welding experiments using rotating arc sensor is done. Different radius of rotating arc sensor is used. And the corresponding welding current and voltage is obtained,which is compared with the results of rotating arc sensor short-circuit process simulation model under high-pressure water environment established in this article. The results show that under high-pressure water environment,rotating arc radius should be optimized,otherwise the short-circuit-arcing cycle will transit to a short-circuit-arcing-abruption cycle,making the welding quality poor. At last the critical radius between the short-circuit-arcing cycle and short-circuit-arcing-abruption cycle under high-pressure water environment is obtained.展开更多
为了解决高压欠注水井降压增注中面临的难题,以定边油田低渗透油藏的主力区块为研究对象,研究该区块的高压注水井在线酸化增注技术。利用单步法酸液体系可以抑制二次、三次沉淀物和溶解堵塞物的特性,设计在线单步法酸化智能增注系统,通...为了解决高压欠注水井降压增注中面临的难题,以定边油田低渗透油藏的主力区块为研究对象,研究该区块的高压注水井在线酸化增注技术。利用单步法酸液体系可以抑制二次、三次沉淀物和溶解堵塞物的特性,设计在线单步法酸化智能增注系统,通过“监控表皮系数变化情况”判断“是否对目的层段持续酸化”,确保最佳酸化效果。室内实验和现场试验结果表明:G-智能复合酸对氟化钠和氟硅酸盐产生二次沉淀的抑制性最好,单步法酸液体系选择G-智能复合酸可以更好地抑制酸反应时二次沉淀物的产生;堵塞物在酸液+助渗透剂剂T影响下的溶蚀率在73.9%~79%之间,堵塞物溶蚀率高于仅加入酸液的,单步法酸液体系选择酸液+助渗透剂可提升堵塞物溶蚀率;与只注入助渗透剂T相比,注入G-智能复合酸+助渗透剂T的高压注水井的油压下降1.0~3.4 MPa,日注水量增加6.1~9.8 m 3,该技术优势显著。展开更多
文摘For the question of applying high-pressure water injection to increase gas extraction efficiency by increasing the permeability of water to drive gas action, an independently designed gas desorption experimental measuring device was used under the condition of external solution invasion. The law of water effect on gas desorption was obtained after water invasion through experiment for the first time. The results show that water＇s later invasion not only can make the quantity of gas dcsorp- tion greatly reduced, but also can make gas desorption end early. Therefore, when evaluating the applications of high-pressure water injection to increase gas extraction efficiency, we should take water damaging effects on gas desorption into account.
基金supported by the National Natural Science Foundation of China(Grant No.51665016)founded by the China Scholarship Council(Grant No.201508360113)
文摘In order to detecting and tracking along the weld seam with rotating arc sensor in underwater welding,the highpressure water environment rotating arc welding hardware platform is established and welding experiments using rotating arc sensor is done. Different radius of rotating arc sensor is used. And the corresponding welding current and voltage is obtained,which is compared with the results of rotating arc sensor short-circuit process simulation model under high-pressure water environment established in this article. The results show that under high-pressure water environment,rotating arc radius should be optimized,otherwise the short-circuit-arcing cycle will transit to a short-circuit-arcing-abruption cycle,making the welding quality poor. At last the critical radius between the short-circuit-arcing cycle and short-circuit-arcing-abruption cycle under high-pressure water environment is obtained.
文摘为了解决高压欠注水井降压增注中面临的难题,以定边油田低渗透油藏的主力区块为研究对象,研究该区块的高压注水井在线酸化增注技术。利用单步法酸液体系可以抑制二次、三次沉淀物和溶解堵塞物的特性,设计在线单步法酸化智能增注系统,通过“监控表皮系数变化情况”判断“是否对目的层段持续酸化”,确保最佳酸化效果。室内实验和现场试验结果表明:G-智能复合酸对氟化钠和氟硅酸盐产生二次沉淀的抑制性最好,单步法酸液体系选择G-智能复合酸可以更好地抑制酸反应时二次沉淀物的产生;堵塞物在酸液+助渗透剂剂T影响下的溶蚀率在73.9%~79%之间,堵塞物溶蚀率高于仅加入酸液的,单步法酸液体系选择酸液+助渗透剂可提升堵塞物溶蚀率;与只注入助渗透剂T相比,注入G-智能复合酸+助渗透剂T的高压注水井的油压下降1.0~3.4 MPa,日注水量增加6.1~9.8 m 3,该技术优势显著。
