Cementing apparatus

Patent · Tue Aug 10 04:00:00 EDT 1993

OSTI ID:6291950

Coone, M G; Cole, F

For use in cementing a casing string within a well bore, an assembly is described comprising: a float collar including an outer body connectable as part of the casing string and an inner body having a bore there through having upper and lower ends and a valve member in the bore to permit flow downwardly and prevent flow upwardly there through, a cement plug including a body having a bore there through and upper and lower ends with a frangible diaphragm there across and lips there about flexibly engagable with the casing string to permit the plug to be prepared downwardly onto the float collar, the upper end of the bore of the float collar having threads thereon and the lower end of the body of the cement plug having threads there about for limited make-up with the threads in the bore of the float collar in response to rotation of the cement plug in one direction, and a wiper plug comprising a body having lips there about flexibly engagable with the casing string to permit the wiper plug to be pumped downwardly onto the cement plug, the upper end of the bore of the cement plug having threads thereon and the lower end of the bore of the body of the wiper plug having threads there about for limited make-up with the threads in the bore of the cement plug in response to rotation of the wiper plug in said one direction, and the inner body of the float collar and the bodies of the cement and wiper plugs being of a drillable material.

• Assignee: Davis-Lynch, Inc., Houston, TX (United States)
• Patent Number(s): US 5234052; A
• Application Number: PPN: US 7-877402
• OSTI ID: 6291950
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
422000* -- Engineering-- Mining & Underground Engineering-- (1980-)
CEMENTING
CONTROL EQUIPMENT
DESIGN
EQUIPMENT
FLOW REGULATORS
JOINTS
MATERIALS
MATERIALS HANDLING EQUIPMENT
THREADED JOINTS
VALVES
WELL CASINGS