CAJ | 학술논문

针对气体钻水平井过程中的井眼净化问题，开展了水平段岩屑运移特征研究。基于气固两相流动模型，采用FL U EN T软件模拟了气体钻井条件下不同粒径、不同注气量、不同钻杆转速和不同钻杆偏心距下单颗粒岩屑和岩屑颗粒群在水平环空的运移特性。模拟结果表明，单颗粒岩屑在水平环空的运移以跃移形式为主，而岩屑颗粒群的运移主要包括蠕移和跃移两种形式；粒径5.0 mm岩屑在注气量50，70和90 m3／min下的首次跳跃距离分别为0.55，0.90和1.50 m ；在注气量为50 m3／min时，粒径1.5 mm岩屑的首次跳跃距是粒径3.0 mm岩屑的1.5倍；粒径7.0 mm岩屑在钻杆静止和转速为60 r／min下的第3次跳跃距离分别为0.43和0.62 m ；粒径6.0 mm岩屑在偏心距0，10和15 m m条件下的第2次跳跃距离分别为0.55，0.44和0.28 m。研究表明，注气量越大、粒径越小、偏心距越小、钻杆转动越快，则岩屑运移的距离越远。建议采取适当提高注气量、安装水平井井眼净化工具、提高钻杆居中度等措施，以提高井眼净化效果。
침대기체찬수평정과정중적정안정화문제，개전료수평단암설운이특정연구。기우기고량상류동모형，채용FL U EN T연건모의료기체찬정조건하불동립경、불동주기량、불동찬간전속화불동찬간편심거하단과립암설화암설과립군재수평배공적운이특성。모의결과표명，단과립암설재수평배공적운이이약이형식위주，이암설과립군적운이주요포괄연이화약이량충형식；립경5.0 mm암설재주기량50，70화90 m3／min하적수차도약거리분별위0.55，0.90화1.50 m ；재주기량위50 m3／min시，립경1.5 mm암설적수차도약거시립경3.0 mm암설적1.5배；립경7.0 mm암설재찬간정지화전속위60 r／min하적제3차도약거리분별위0.43화0.62 m ；립경6.0 mm암설재편심거0，10화15 m m조건하적제2차도약거리분별위0.55，0.44화0.28 m。연구표명，주기량월대、립경월소、편심거월소、찬간전동월쾌，칙암설운이적거리월원。건의채취괄당제고주기량、안장수평정정안정화공구、제고찬간거중도등조시，이제고정안정화효과。
To enhance the hole-cleaning performance during gas drilling of horizontal wells ,research has been conducted for characteristics of cutting migration in horizontal sections .Based on the gas-solid flow model ,the migration characteristics of single-particle cuttings and multi-particle cuttings were simu-lated using FLUENT at different diameters ,gas injection rates ,rotating speeds and eccentric distances of drillpipe .The results showed that in a horizontal annulus ,single-particle cuttings mainly migratedin salta-tion ,while multi-particle cuttings migrated in creep and saltation .For the gas injection rates of 50 m3/min ,70 m3/min and 90 m3/min ,the first saltation distances of 5mm diameter cuttings were 0.55 m , 0.90 m and 1.50 m respectively .For the gas injection rate of 50 m3/min ,1.5 mm diameter cuttings’ first saltation distance is 1.5 times of 3.0 mm diameter cuttings .For the rotating speeds of 0 r/min and 60 r/min ,the third saltation distances of 7.0 mm diameter cuttings were 0.43 m and 0.62 m respectively under the gas injection rate of 50 m3/min .For the eccentric distances of 0 mm ,10 mm and 15 mm ,the second saltation distances of 6 mm diameter cuttings were 0.55 m ,0.44 m and 0.28 m respectively under the gas injection rate of 50 m3/min .Therefore ,the faster gas injection rate ,the smaller diameter of cuttings ,the faster rotating speed and the smaller eccentric distance ,the further would cuttings be removed .Taking measures such as improving gas injection rate appropriately ,installing a hole cleaning device for horizontal well and moderating drilling pipe could benefit the hole cleaning efficiently .