搬开逼操喷水视频,美女打开逼让男生操,亚洲欧美精品视频观看,亚洲成人天堂2025,91亚洲自偷观看高清久久,精品久久久视频网站,91久久国产视频网,人人妻人人澡人人日,久久爽人人爽久久爽av杏吧

LS series sand-bailer is a kind of tool to bail sand in the oil well through suction pressure theory. The special designed sand-bailing heady can effectively bail sands in the bottom of oil well. The probation of this tool in Bohai oilfield of CNPC is pefect and the result is confirmed by the user.

The features of LS series sand-bailing tool:

High efficiency guaranteed by the junction action of water and mechanism
No additional pressure to the stratum and without pollution to the oil reservoir
Easy and safe operation