循環(huán)接頭是下套管中途或下完套管時(shí)循環(huán)鉆井液用的專用接頭,分為套管螺紋循環(huán)接頭和由壬螺紋循環(huán)接頭。
循環(huán)接頭技術(shù)參數(shù)如下
鉆桿母螺紋
|
套管螺紋
|
水眼mm
|
長(zhǎng)度mm
|
NC38
|
5″偏梯扣BTC
|
57
|
400
|
5″長(zhǎng)圓扣LTC
|
5″短圓扣STC
|
NC38
|
5″偏梯扣BTC
|
57
|
400
|
5-1/2″長(zhǎng)圓扣LTC
|
5-1/2″短圓扣STC
|
NC50
|
7″偏梯扣BTC
|
71
|
460
|
7″長(zhǎng)圓扣LTC
|
7″短圓扣STC
|
NC50
|
9-5/8″偏梯扣BTC
|
71
|
460
|
9-5/8″長(zhǎng)圓扣LTC
|
9-5/8″短圓扣STC
|
NC50
|
10-3/4″偏梯扣BTC
|
71
|
480
|
10-3/4″長(zhǎng)圓扣LTC
|
10-3/4″短圓扣STC
|
NC50
|
13-3/8″偏梯扣BTC
|
71
|
480
|
13-3/8″長(zhǎng)圓扣LTC
|
13-3/8″短圓扣STC
|