摘要:
An improved system and method for ranging while drilling, in effect, induces a dynamic hot spot on the casing of a nearby well. The induced hot spot acts as a magnetic source that can be reliably detected from within the drillstring and in such a manner as to infer the relative position and orientation of the casing to the drillstring. At least some disclosed method embodiments employ one or more rotating magnets in the drillstring, an array of at least two magnetometers in the drillstring and one or more phase-locked loops that are used to enhance the signal to noise ratio of the magnetic signal scattered off of the casing from the rotating magnetic field. The rotating magnet or magnets may be magnetic dipoles or magnetic multipoles, and may be modulated to enable the use of multiple magnetic field sources.
摘要:
A method of characterizing a formation is disclosed. A well bore is drilled in the formation. Cuttings are retrieved from the well bore while drilling the formation and a hyperspectral image of the cuttings is continuously obtained. The hyperspectral image of the cuttings is analyzed to determine formation characteristics.
摘要:
Procedures are described for monitoring dynamics along a drill string during the drilling process using only surface instrumentation or using a combination of surface and downhole instrumentation. Events such as drill collar whirl may be identified from signatures found in signals generated by an electromagnetic sensor such as a magnetometer and/or from a mechanical sensor such as accelerometer. Additional embodiments are described.
摘要:
A method and system for designing bottom hole assembly configuration. The system and method include modeling the bottom hole assembly by dividing complicated BHA configurations into independent modules and segments. Modules are bounded by two stabilizers where segments are bounded by bottom hole assembly components. A recursive process is used to derive solutions for each of the segments and modules. Only two unknowns (and two non-linear equations) are left when the recursive process reaches to the bit. The two unknowns are then solved by iteration.
摘要:
An apparatus for detecting data in a fluid pressure signal in a conduit comprises an optical fiber loop comprises a measurement section and a delay section wherein the measurement section is disposed substantially circumferentially around at least a portion of the conduit, and wherein the measurement section changes length in response to the fluid pressure signal in the conduit. A light source injects a first optical signal in a first direction into the measurement section and a second optical signal in a second direction opposite the first direction into the delay section. An optical detector senses an interference phase shift between the first optical signal and the second optical signal and outputs a first signal related thereto.
摘要:
A method and device for measuring a property, such as torque, includes a plurality of sensors, and a measuring device. The sensors attach to a downhole apparatus at a distance from one another. The sensors provide signals indicating their positions. A logic circuit may calculate an angle between the sensors. The logic circuit then calculates the property based on the angle, the distance between the sensors, and other known physical properties of the downhole apparatus.
摘要:
Measurement of petrophysical and geophysical data of formations in a wellbore using a long gauge bit having at least one sensor therewith. The at least one sensor may be installed in at least one flute of the long gauge bit and/or in the long gauge portion thereof. Data for creating images of the formations are obtained at or near the bottom of the borehole and proximate to the long gauge bit used for drilling the borehole. Orientation of the long gauge bit is also available on a real time basis. Magnetic and/or gravitational sensors may be used in determining bit orientation. The flutes of the long gauge bit and the long gauge portion thereof may have standard inserts to accommodate various types of different sensors and electronic packages therefor.
摘要:
In some embodiments, an apparatus and a system, as well as a method and an article, may operate to couple, in a substantially fluid-tight manner, a first tubular member (140′) carrying a first set of tubular member conductors (124′) to a hollow cylinder (104). The hollow cylinder may include two or more sets of insulators having an equal number of insulating elements (120, 128) located on the outer surface of the hollow cylinder, and two or more sets of conductors (110, 116) having an equal number of conducting elements defining pairs of conducting elements located on the outer surface . Each of the pairs of conducting elements may be insulated from the other pairs of conducting elements by the sets of insulators. Various embodiments may also operate to couple, in a substantially fluid-tight manner, a second tubular member (140″) carrying a second set of tubular member conductors to the hollow cylinder.
摘要:
In some embodiments, an apparatus that can be used to contain radiation sources, explosives, and other material transported as cargo may include layers of lead, tungsten, plastic, paraffin, armor, and heat absorbing material to surround an interior portion, as well as a lockable port to provide access to the interior portion. In some embodiments, activities may include detecting various conditions associated with the layers or cargo, and impeding access to the interior portion responsive to detecting the conditions.
摘要:
A system and method for determining blockage in a wellbore containing fluid and/or in a formation adjacent the wellbore, according to which energy is generated in the fluid and variables associated with the energy are measured.