Stage cementing tool, consisting of stage collars and port collars, is placed within any types of casing string to provide an intermediate passage to the annulus (Fig. 1). The collars are generally made of match-grade steel. They may be available in special weight ranges to optimize strength and internal dimensions. Stage cementing tool is generally used to:Protect weak formations from...

Casing Centralizer Stop Collar TypesWHAT IS A STOP COLLAR?Stop Collar is a device that keep centralizers and other casing attachments in place on the casing. Stop collars are available in hinged and slip-on styles and can fit 2 3/8″ – to 30″ pipe. Our collars are tested in accordance with API 10D II recommendations. We can supply a range of stop collar options to suit any...

types of production packer The packer types are different as per different standard.This article will introduce it as per its different standard.It will help you choose the best oil and gas packers.　1. According to the use of the packer2. According to the installation method　3. By size4. According to working temperature5. According to the working principle of the seal