Abstract:
A drill pipe (10, 100, 220, 200, 210, 250) is disclosed which includes a cylindrical pipe section (12), a box end (14), a pin end (16) and a hydraulic hose assembly (202, 18) or tube, which may not be sealed to pin and box ends (212, 90, 260), inserted between the box and pin ends and extending within the cylindrical pipe section. All, or the majority of drilling fluid passes through the hydraulic hose assembly (202, 18) or tube (212, 90, 260). The interior surface of the cylindrical pipe section (12) may or may not be exposed to the drilling fluid but any corrosion generated by metal-to-fluid contact is generally trapped between the hose or tube and the pipe section. The reduced volume of the hydraulic hose assembly (202, 18) or tube (212, 90, 260) relative to conveying the drilling fluid through the interior of the cylindrical pipe section reduces significantly the waste of drilling fluid, allows the fluid to be pressurized more rapidly to initiate drilling operation, and limits fluid spill damage to the environment.
Abstract:
A locating system has its performance enhanced by the use of digital filtering. The locating system may include a transmitter for transmitting an electromagnetic signal from a concealed object. The locating system may also use electromagnetic signals from existing electromagnetic sources unrelated to the locator system. A receiver (201, 202, 204, 205, 207, and 210) is provided for receiving a selected electromagnetic signal. The signal is subsequently converted (211) from an analog signal into a digital signal and subjected to digital filtering (212). The resulting digital signal is then processed (212) to provide location information about the concealed object.
Abstract:
The present invention generally relates to a system for use in determining the location and orientation of concealed underground objects and, more particularly, to an improved locator system having a unique and improved interface with an operator. In accordance with one embodiment of the invention, a magnetic field detector for locating concealed underground objects is provided. The magnetic field detector includes a housing (301) having an upper housing portion (302) and a lower housing portion (303). A receiver is disposed within said housing for receiving magnetic field signals from the concealed underground objects. A swivel joint (320) couples the upper housing portion and the lower housing portion to permit relative rotational motion.
Abstract:
An automatic pipe handling device (10) is disclosed which includes a support frame (12) mounted on a boring device. Removable pipe racks (16, 80, 130, 140) can be placed in position on the support frame (12) to deliver pipe to the spindle axis or to remove pipe therefrom as required. The pipe sections are removed from the pipe rack and positioned on the spindle axis by pipe grippers (32) mounted on hydraulic cylinders (28, 30) mounted on a rotating longitudinal shaft (20). The grippers and shaft similarly return the used pipe sections for storage to the pipe rack. In one pipe rack (16), an S-shaped guide path (72) is used. In another pipe rack (80), a plurality of rows (88, 90, 92) of pipe sections are used.
Abstract:
An improved locator system is provided which transmits digital and analog information over an electromagnetic field (32) that is radiating from an underground source (20). The locator system includes a transmitter (100) that modulates its output signal by turning its output signal on and off in response to a sequence of digital words. The transmitter also modulates an analog signal onto the transmitted signal. The modulated analog signal can include an audio frequency or voice signal. The improved locator system also includes a receiver (200) that senses and detects the transmitted digital or analog signal impressed on the radiated electromagnetic field. The receiver also demodulates the transmitted audio frequency signal and provides an audio output signal to an operator.
Abstract:
An angle sensor (5) for determining the roll angle of a rotating member includes an array of paired electrical components (15), each electrical component having an electrical characteristic which varies. A fluid (27) is placed within the cavity (24) and is responsive to the rotation of the rotating member causing the electrical characteristic of a first one of each pair of electrical components to be different than the electrical characteristic of a second one of each pair of electrical components. A comparator compares the electrical characteristics of the first and second ones of each pair of electrical components to determine the roll angle of the rotatable member.