Wells – Processes – Producing the well
Patent
1982-03-26
1984-10-02
Novosad, Stephen J.
Wells
Processes
Producing the well
166285, 166242, 175 67, 175171, 405236, 405248, E21B 3314, E21B 718, E21B 712
Patent
active
044742436
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention concerns running and cementing pipe in subsea formations and, in particular, running and cementing in the subsea floor the first pipe string (structural pipe) run in an offshore well drilling operation.
BACKGROUND ART
In conventional methods for running structural casing in offshore drilling operations, a temporary guide base is lowered on guide lines from the surface of the water and placed on the ocean floor. An opening through the center of the guide base is positioned over the site of the well to be drilled and serves as a re-entry means to the well site. A string of drill pipe having a drill bit on the lower end thereof is then lowered through the opening in the guide base and a hole is drilled into the ocean floor to the setting depth of the structural pipe string. The guide lines are used to guide the drill string to the opening in the guide base. The drill pipe is removed from the drilled hole to the water's surface. Structural casing is then lowered through the opening in the temporary guide base and into the drilled hole, guided by the guide lines, on drill pipe by means of a suitable running tool connected to the lower end of the drill pipe and releasably connected to the structural casing. A permanent guide base is attached to the upper end of the casing pipe. Once the structural casing has been set it is cemented in place. The running rool is released from the structural casing string and removed along with the drill string to the water's surface.
In a location that has a soft unstable, unconsolidated ocean floor the temporary guide base may settle below the ocean floor rendering it useless as a reentry means. For this reason and also, because of other problems such as, severe hole instability and loss of drilling fluid (used to control formation pressure and to clean and stabilize the well bore) into the formation, this method for running and cementing structural casing strings is not satisfactory in such locations.
The present invention overcomes these problems by allowing the structural casing string to be cemented in place prior to releasing it from the drill pipe running string thereby eliminating the need for drilling a hole prior to running the structural casing string. Further, the invention eliminates the need for running a temporary guide base. This feature makes this invention also advantageous for use in normal, firm bottom water locations. Considerable rig time is saved by eliminating the running of a temporary guide base when running pipe in either type location.
DISCLOSURE OF INVENTION
The apparatus for running and setting large diameter (structural) pipe in accordance with the invention includes a jet shoe which is connected into the end of the large pipe. The shoe comprises a cylindrical member which contains an inner receptacle provided with an upper seat, a polished bore, a check valve and a chamber. A plurality of open-ended jet tubes connect to the chamber at their upper ends and extend to the lower end of the shoe at their lower ends. Nozzles are located in the ends of the tubes which are arranged to facilitate washing formation away from in front of the shoe to form the hole for the large pipe. The receptacle and the tubes are cemented in place in the shoe with the upper end of the receptacle and the lower end of the tubes forming continuous flow paths through the valve.
A stinger sub is connected to the lower end of a smaller diameter (drill) pipe. The stinger contains seals, is insertable into the receptacle and seals off against the polished bore of the receptacle. The smaller pipe also contains a closure member which releasably and sealingly engages the upper end of the larger pipe string. A permanent guide base is also connected to the upper end of the larger pipe string. The smaller pipe also contains a bumper sub, a telescoping section, for spacing-out purposes. The closure member may be provided with an opening to which a hose is connected for measuring at the surface pressures within the larger pipe.
The method in acc
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Dang Hoang C.
Exxon Production Research Co.
Novosad Stephen J.
Schneider John S.
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