Cement collar and method of use

(19)

(11)

EP 0 166 568 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	29.04.1987 Bulletin 1987/18

(43)	Date of publication A2:
	02.01.1986 Bulletin 1986/01

(21)	Application number: 85304357

(22)	Date of filing: 18.06.1985

(84)	Designated Contracting States:
	AT DE FR GB IT NL

(30)

Priority:

27.06.1984 US 624884

(71)	Applicant: HALLIBURTON COMPANY
	()

(72)	Inventor:
	Bradley, Billie Jack ()

(54)	Cement collar and method of use

(57) A cementing collar for inclusion in a well casing to permit primary multiple stage cementing comprises a tubular housing (12,40, 64), a cementing port (52) and sleeve means (200) inside the housing and slidable in response to pressure changes to open and close the port.

Search report