Application and characteristic Position device (stop ring or stop collar), called position ring, stop circular, brake ring, etc. It is used to limit the centralizer or cement basket slip on casing.
1. It is divided into mobile screw type, fixed screw type and buckle type.
2. Install and use the method
a. When use mobile screw type stop collar, slip over the casing, tighten the screws using wrench.
b. When use fixed screw stop collar, put the collar around the casing, insert the screw, and knock into screws by hammer.
c. when install buckle type stop collar, buckle the stop collar onto the casing, lock with pin,knock into the screws.
Stop collars
Keep centralizers and other casing attachments in place on the casing.
Available in hinged and slip-on styles and size from 2-3/8''- to 30''.
Stop collars use set screws for increased holding force. The hinged design is for applications on upset tubing. These stop collars are available in slip-on for tight clearances and hinged for semi-tight clearances.
Hinged stop collars that use hardened inserts (dogs) to provide a positive lock onto the casing. The specially designed dogs bite into the casing, which provides the stop collar's strong holding force. The recommended torque on the bolt is approximately 25 to 35ft-lb. When properly installed, the hinged stop collar can provide a holding force up to 40,000lb.
Slip-on stop collar with set screws is slipped onto the end of casing and up to the top of the joint to the desired location. The set screws are tightened to approximately 35ft-lbf. This style of stop collar can hold forces up to 20,000lb. They are designed for close-tolerance liner jobs as well as in the installation of cement baskets and cetralizers of different designs. This style stop collar is available in 3 1/2-in. to 30-in. casing sizes.
| Specifications,mm | 13 3/8″ | 10 3/4″ | 9 5/8″ | 8 1/8″ | 7 5/8″ | 7″ | 5 1/2″ | 5″ | 4 1/2″ | |
| ID,mm | 338 | 272 | 245 | 206 | 193 | 177 | 139 | 126 | 114 | |
| OD,mm | 350 | 284 | 257 | 218 | 285 | 189 | 151 | 138 | 126 | |
| Holding Force,KN | 40 | 40 | 40 | 30 | 30 | 30 | 30 | 24 | 24 |
About Puyang Zhongshi Group:
Puyang Zhongshi Group Co., Ltd. was founded in 1996, which is the restructured enterprise of Central Plains oilfield branch company of SINOPEC . The company registered capital is 21.4 million US dollars, with annual output value 71 million US dollars, 580 employees, including more than 160 technical and administrative staff.
We leading manufacturer and supplier of pumping unit, subsurface sucker rod pump, wellhead (Christmas Tree), pressure vessels, drilling solid control series products and cementing accessories. Our aim is to provide high-quality products and services to our customers and establish long-term partnerships with them.
