日韩经典av I 美女又大又黄www免费网站 I 一级性生活黄色片 I 亚洲一区伦理 I 亚洲成色www久久网站夜月 I 国产精品久久久久久久久久免费 I 懂色一区二区三区久久久 I 久久亚洲精品无码av I 精品视频一区二区在线观看 I 视频一区二区不卡 I 中文字幕视频 I 欧美国产视频在线 I 欧美日韩偷拍视频 I 免费福利av I 色欲久久久天天天综合网精品 I 中文字字幕乱码视频高清 I 久久综合久久久 I 伊人亚洲综合影院首页 I 午夜乱轮 I 亚洲а∨天堂男人无码2008 I 日韩特级黄色片 I 日日躁狠狠躁狠狠爱 I 成人性视频在线播放 I 国产精品mm I 日本免费看黄 I 成人午夜精品久久久久久久3d I 中文字幕av在线不卡 I 玖玖爱这里只有精品视频 I 婷婷伊人五月天 I 四虎国产精品亚洲一区久久特色 I 免费人妻av无码专区 I 欧美老女人性视频 I 精品国产一区久久 I 艳妇臀荡乳欲伦交换电影 I 亚洲sss综合天堂久久

Application:

Circulation head (circulation swage) a special joint used to circulate drilling fluid, connecting to the kelly or drill pipe, the bottom connects to the casing during casings are running or after. Depends on request, there are drill pipe thread circulation head, casing thread circulation head, union thread circulation head. Its top end connects to drill pipe via drill pipe thread, or connects to the hose, the bottom connects to casing joint via casing BTC (LTC/STC).?

Features:

1. Its upper end is drill pipe box or union, the nether end is casing pin. It is a crossover(X/O) with hollow inside.

2. Main body are made from heat treated alloy steel. Connected with union by internal and external argon arc welding, high strength, resistance to high pressure, safety and reliability.

Confirmation when order:

1) Overall length and length of neck.?

2) Thread type of top end.?

3) Thread type of bottom end.?

Model:

Hammer union box sub * Casing thread pin,?

Hammer union box sub * Drill pipe pin,?

Drill pipe thread box * casing thread pin

Specification:

20”, 18-5/8”, 13-3/8”, 10-3/4”, 9-5/8”, 7-5/8”, 7”, 6-5/8”, 5-1/2”, 5”, 4-1/2”, 4”