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Portable drill pipe handling apparatus for use with oil and gas well drilling rigsPortable drill pipe handling apparatus for use with oil and gas well drilling rigs description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20090053013, Portable drill pipe handling apparatus for use with oil and gas well drilling rigs. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS
Priority of U.S. Provisional Patent Application Ser. No. 60/956,815, filed 20 Aug. 2007, incorporated herein by reference, is hereby claimed. STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENTNot applicable REFERENCE TO A “MICROFICHE APPENDIX”Not applicable BACKGROUND OF THE INVENTION1. Field of the Invention The present invention relates to oil and gas well drilling and to an apparatus for handling pipe that is used during oil and gas well drilling (including geothermal and/or mineral drilling). More particularly, the present invention relates to an improved pipe handling apparatus for transferring successive lengths of drill pipe from a pipe rack to the deck of a drilling rig, wherein a moving section of the apparatus lifts pipe upwardly along an inclined path with a trestle that is driven to travel upon a base or supporting frame, the trestle gradually increasing in inclination as it moves between a lower beginning position and an upper final inclined position that presents the length of the drill pipe to workers on the rig floor. 2. General Background of the Invention During the drilling of oil and gas wells, an elongated “string” of pipe is made up of separate joints of pipe (e.g. drill pipe can be in lengths of thirty feet (30′) (9.1 meters), casing typically in lengths of forty feet (40′) (12.2 meters) that are connected end to end during the “trip” into the well and as drilling progresses deeper and deeper into the earth. The lower end of the string carries a drill bit. These same joints of pipe are each separated from the drill string one joint at a time when the drill string is removed from the well bore after such a “trip” into a well. Drill pipe joints can be stored (e.g. horizontally) on pipe racks next to the drill rig cat walk. Typically, the drill rig floor is at a considerably higher elevation than the pipe racks and cat walk. Many drillers face the problem of transferring drill pipe from the pipe rack to the elevated rig deck. One of the problems with the transportation of drill pipe is that of maintaining a proper orientation of the section of the drill pipe relative to the rig floor, especially when it is about to be either removed from the pipe transportation unit to the rig floor or transferred from the rig floor back to the pipe transportation unit. For example, it is important that the pipe be oriented in the correct position so that it can be elevated to lower the collar of the pipe directly into waiting pipe elevators. Another problem with the transportation of pipe racks to the drill floor is that the pipe is typically stacked in layers. This means that each layer must be unstacked one layer at a time. Pipe can be stacked many layers thick especially if the drilling operation is going very deep into the earth. There have been numerous approaches to the task of transferring pipe from a lower pipe rack to an upper, elevated rig floor. Some pipe handling devices are ground supported mechanical units. Others are truck units with a main high line and a fast line to feed and retrieve the pipe trough. The mechanical units are heavy and are designed for individual rigs. They remain with the drilling rig during drilling operations. The truck mounted units are more diversified and portable, but take up more space because of the typically large truck portion of the apparatus. Some patents have issued that are directed to the problem of conveying oil and gas well drilling pipe joints from a pipe rack to the floor of the drilling rig. The following table lists possibly relevant patents, the order of listing having no significance.
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