API 7-1 Circulating Sub with Drill Pipe Thread /Connection/Wear Sub

• Customization: Available
• After-sales Service: Provide
• Warranty: 1 Year
• Model NO.: J03
• Manufacturing Process: CNC Milling
• Surface Treatment: Spray-Paint
• Operation Pressure: Atmospheric Pressure
• Material: Alloy
• OEM: Provide
• Others: API and ISO
• Alloy: 4145h
• Transport Package: Wooden Case
• Specification: DWT89
• Trademark: KAIDI
• Origin: China
• HS Code: 8431431000

Product Description

The Circulating Sub is a critical downhole tool designed to enable controlled fluid circulation in drilling and workover operations. Engineered for reliability in demanding conditions, it provides a secondary flow path to bypass the drill string, improving well control, cuttings removal, and operational efficiency.

Key Features & Benefits

 Dual-Port Design - Allows fluid diversion between the annulus and drill string for efficient wellbore cleaning or pressure management.
 Pressure-Activated or Mechanical Operation - Configurable for automatic or manual activation based on downhole conditions.
 High-Pressure Rating - Robust construction (API 7-1 compliant) withstands up to 10,000+ psi (690 bar) for deep/high-pressure wells.
 BHA Integration - Compatible with standard drill string connections (NC, Reg, FH).
 Reduced Non-Productive Time (NPT) - Minimizes stuck pipe risks by enabling immediate circulation.
 

Circulating Sub
Circulating Sub With Drill Pipe Thread
No	Box	PIN	PIN			OD mm	length mm	weight kg
1	NC50	20"	BTC	LTC	STC	508	680	243
2	NC50	18 5/8"	BTC	LTC	STC	473	650	215
3	NC50	16"	BTC	LTC	STC	406	650	190
4	NC50	13 3/8"	BTC	LTC	STC	340	650	140
5	NC50	11 3/4"	BTC	LTC	STC	298	610	100
6	NC50	10 3/4"	BTC	LTC	STC	273	610	94
7	NC50	9 5/8"	BTC	LTC	STC	245	610	88
8	NC50	8 5/8"	BTC	LTC	STC	219	600	70
9	NC50	7 5/8"	BTC	LTC	STC	193	600	65
10	NC50	7"	BTC	LTC	STC	178	600	75
11	NC50	6 5/8"	BTC	LTC	STC	168	560	60
12	NC50	5 1/2"	BTC	LTC	STC	168	560	52
13	NC50	5"	BTC	LTC	STC	168	610	52
14	NC50	4 1/2"	BTC	LTC	STC	168	610	46
Circulating Sub With Hammer union Thread
No	Pin	Box	Box			OD mm	length mm	weight kg
1	2"1502	20"	BTC	LTC	STC	508	650	243
2	2"1502	18 5/8"	BTC	LTC	STC	473	650	215
3	2"1502	16"	BTC	LTC	STC	406	610	190
4	2"1502	13 3/8"	BTC	LTC	STC	340	610	140
5	2"1502	11 3/4"	BTC	LTC	STC	298	610	100
6	2"1502	10 3/4"	BTC	LTC	STC	273	560	90
7	2"1502	9 5/8"	BTC	LTC	STC	245	560	78
8	2"1502	8 5/8"	BTC	LTC	STC	219	560	62
9	2"1502	7 5/8"	BTC	LTC	STC	193	560	42
10	2"1502	7"	BTC	LTC	STC	178	500	32
11	2"1502	6 5/8"	BTC	LTC	STC	168	500	30
12	2"1502	5 1/2"	BTC	LTC	STC	140	500	29
13	2"1502	5"	BTC	LTC	STC	127	500	20
14	2"1502	4 1/2"	BTC	LTC	STC	114	500	18