Stage cementing collar

• US 3,338,311 A
• Filed: 12/14/1964
• Issued: 08/29/1967
• Est. Priority Date: 12/14/1964
• Status: Expired due to Term

• Current Assignee: Martin B. Conrad
• Original Assignee: Martin B. Conrad
• Inventors: Conrad, Martin B.
• Application Number:
  US04/418,135
• Time in Patent Office: 988 Days
• US Class Current: 166/154
• CPC Class Codes: E21B 34/14 operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools E21B34/066 takes precedence

Claims

10. A MULTIPLE STAGE CEMENTING COLLAR COMPRISING:

A TUBULAR BODY MEMBER ADAPTED TO BE MOUNTED IN A CASING STRING TO BE RUN INTO A WELL BORE, A LATERAL PORT IN SAID BODY, A SLEEVE SLIDABLY DISPOSED IN SAID BODY AND HAVING A LATERAL PORT REGISTRABLE WITH SAID BODY PORT, AND ADDITIONAL MEMBER IN SAID BODY MEMBER, RELEASABLE MEANS COOPERATIVE WITH SAID SLEEVE, SAID BODY AND SAID ADDITIONAL MEMBER FOR RELEASABLY HOLDING SAID SLEEVE IN A FIRST POSITION WITH SAID SLEEVE PORT SPACED FROM SAID BODY PORT, MEANS ON SAID SLEEVE FOR MOVING SAID SLEEVE RELATIVE TO SAID BODY MEMBER TO A SECOND POSITION WITH SAID SLEEVE PORT IN A REGISTRY WITH SAID BODY PORT, RELEASABLE MEANS FOR HOLDING SAID SLEEVE IN SAID SECOND POSITION, AND MEANS ON SAID SLEEVE FOR MOVING SAID SLEEVE RELATIVE TO SAID BODY MEMBER AND TO SAID ADDITIONAL MEMBER TO A THIRD POSITION WITH SAID SLEEVE PORT SPACED FROM SAID BODY PORT.