News Column

Patent Application Titled "Cantilever Contained Drilling Unit Utilizing Vertical Tubular Conveyance and Standbuilding System" Published Online

May 29, 2014



By a News Reporter-Staff News Editor at Politics & Government Week -- According to news reporting originating from Washington, D.C., by VerticalNews journalists, a patent application by the inventors Hill, Edwin T. (Houston, TX); Waddell, Dennis W. (Angleton, TX), filed on March 14, 2013, was made available online on May 15, 2014.

The assignee for this patent application is Transocean Sedco Forex Ventures Limited.

Reporters obtained the following quote from the background information supplied by the inventors: "Traditionally on Jackup Drilling Units, tubulars are taken from the horizontal position on a pipe deck, up through the V-door, and to a well center by manual handling via cranes, winches, and tuggers. The storage location is not a fixed distance from the well center, as the well center varies according to cantilever skid-out distance and transverse rotary table movement. Some improvements have been made over the years in pipe handling systems such as the introduction of column racking units, horizontal-to-vertical machines, and horizontal conveyors, but the efficiency of the overall functionality of drilling unit is still lacking, in part due to the fact that tubulars are usually stored on the fixed hull, but required on the moveable drill floor. The concept of keeping stored tubulars in a position of permanent fixity with respect to the drill floor has not been previously employed.

"Embodiments of this invention streamline tubular handling on offshore drilling units by providing a simple, logical, streamlined system for storing, retrieving, and delivering tubulars in a controlled manner that is both repeatable and consistent. On a cantilever jackup unit, for example, the derrick and well are normally situated on the aft end. By storing pipe vertically, space is saved, and by doing so on the forward end of the cantilever on a jackup unit, the weight of the tubulars is also used as counterweight. The capability to build stands of pipe on the cantilever and then have them delivered vertically by a conveyor directly to the well center reduces risk to personnel by significantly reducing the number of tubulars that must be handled manually. By eliminating unnecessary motions in the process from storage to delivery, the logistical flow improvement translates directly to improved reliability and consistent tripping efficiency.

"Embodiments of this invention simplify the processes of transporting and assembling tubulars by eliminating wasted movements. For example, pipe racking system ('PRS') travel time is reduced going from the well center to a setback slot and back again as embodiments of the invention presents tubulars to the well center directly with no wait time. Further, the manual handling of tubulars is dangerous and can be inconsistent. Embodiments of this invention significantly minimizes human interface with moving tubulars and is a major step toward total automation of tubular handling."

In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventors' summary information for this patent application: "The invention is directed to a tubular standbuilding conveyor apparatus that includes a horizontal conveyor belt apparatus running along a horizontal axis; a vertical conveyor belt apparatus oriented parallel to and vertically offset from the horizontal conveyor belt apparatus; a stand building hoist; and an iron roughneck. The horizontal and vertical conveyor belts are configured to convey vertically oriented tubulars along the horizontal axis and the stand building hoist and the iron roughneck are configured to attach a vertically oriented tubular to one or more other vertically oriented tubulars.

"The horizontal conveyor belt apparatus is capable of supporting large point loads and includes a steel track shoe belt. The surface of the horizontal conveyor belt apparatus is covered with a protective surface. The protective surface is at least one of wood, nylon or rubber.

"The vertical conveyor belt apparatus includes a cogged belt, which is mechanically coupled to the vertical conveyor belt apparatus through a set of right angle drive gears. At least one additional vertical conveyor belt apparatus is located parallel to and vertically offset from the vertical conveyor belt. In one embodiment, there exists at least one additional vertical conveyor belt apparatus. The vertical conveyor belt apparatuses are offset from each other on the horizontal ends of the vertical conveyor belts. The parallel vertical conveyor belt apparatuses are horizontally offset from each other. The vertical conveyor belts are horizontally offset from each other such that when a vertical tubular is on the horizontal conveyor apparatus and leaned against the vertical conveyor belt apparatus, the vertical tubular would be at about a 3 degree angle from a plane running vertically through the horizontal center of the horizontal conveyor apparatus.

"The apparatus further includes a stand delivery conveyor assembly configured to convey vertically oriented tubulars to or from the horizontal conveyor belt apparatus. The stand delivery conveyor assembly includes a delivery horizontal conveyor belt apparatus running along the horizontal axis; and at least one delivery vertical conveyor belt apparatus oriented parallel to and vertically offset from the horizontal conveyor belt apparatus. At least one additional vertical conveyor belt apparatus is located parallel to and vertically offset from the vertical conveyor belt.

"There is further disclosed a tubular interchange device located between the tubular standbuilding conveyor apparatus and the stand delivery conveyor assembly, wherein the tubular interchange device is configured to convey vertically oriented tubulars from the horizontal conveyor belt apparatus to the stand delivery conveyor assembly.

"In one embodiment, there is included a drill rig containing the tubular standbuilding conveyor apparatus described above located on a moveable drill floor. The drill rig includes a vertical tubular setback area located forward of the tubular standbuilding conveyor apparatus and a vertical assembled tubular setback area located aft of the tubular standbuilding conveyor apparatus and in proximity to the well center. A lower level bridge crane assembly is also included in which the lower level bridge crane assembly is configured to move a tubular from the setback area to the tubular standbuilding conveyor apparatus. An upper level bridge crane assembly is further included. The stand building hoist is attached to the upper level bridge crane assembly. The iron roughneck may also be attached to the upper level bridge crane assembly. An additional tubular standbuilding apparatus is included in which each tubular standbuilding apparatus is oriented such that the horizontal conveyor belt apparatus is inboard of the vertical conveyor belt apparatus. Though this embodiment is directed toward a moveable drill floor, a person skilled in the art would recognize that the design is equally applicable to a fixed drill floor.

"A method for providing tubular assembly includes the steps of loading at least a first and a second vertically oriented tubular onto a conveyor assembly; raising the first tubular above the second tubular; and attaching the first tubular to the second tubular. The step of raising the first tubular is done with a standbuilding hoist. Attaching the first tubular to the second tubular is done with an iron roughneck. A method for providing tubular disassembly includes the steps of removing at least two attached tubulars from a well center; loading the attached tubulars onto a vertical conveyor assembly; separating the attached tubulars; and lowering the top most separated tubular onto the vertical conveyor assembly. A further step is conveying the separated tubulars to a storage setback using the vertical conveyor assembly in which separating the attached tubular is done with an iron roughneck and the lowering is done with a standbuilding hoist.

"The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that the detailed description of the invention that follows may be better understood. Additional features and advantages of the invention will be described hereinafter which form the subject of the claims of the invention. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present invention. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the invention as set forth in the appended claims. The novel features which are believed to be characteristic of the invention, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

"For a more complete understanding of the present invention, reference is now made to the following descriptions taken in conjunction with the accompanying drawing, in which:

"FIG. 1 is a profile view of a rig illustrating an embodiment of pipe storage and setback.

"FIG. 2 is a profile view of a rig illustrating an embodiment of the pipe handling equipment.

"FIG. 3 is a plan view of a rig illustrating an embodiment of the pipe handling equipment.

"FIG. 4 illustrates an example of the tubular stand building system.

"FIGS. 5A-D are end and sectional views of the rig illustrating an embodiment of the pipe handling equipment.

"FIG. 6 illustrates an example workflow through the tubular stand building system."

For more information, see this patent application: Hill, Edwin T.; Waddell, Dennis W. Cantilever Contained Drilling Unit Utilizing Vertical Tubular Conveyance and Standbuilding System. Filed March 14, 2013 and posted May 15, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=3245&p=65&f=G&l=50&d=PG01&S1=20140508.PD.&OS=PD/20140508&RS=PD/20140508

Keywords for this news article include: Transocean Sedco Forex Ventures Limited.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


For more stories on investments and markets, please see HispanicBusiness' Finance Channel



Source: Politics & Government Week


Story Tools






HispanicBusiness.com Facebook Linkedin Twitter RSS Feed Email Alerts & Newsletters