Chevron Research Company

Chevron Research & Technology Company

Other

Peter Graebner

Jorg A Angehrn

Swan A Sie

Satellite-altimetry measurements of ocean water height are calibrated by measuring an ocean water height by using satellite-altimetry at one location during a time period, measuring another ocean water height during the same time period against a known reference on a fixed offshore structure at another location near the first location, and comparing these two sets of measurements. One way of measuring ocean water height against a known reference point on a fixed offshore structure is by measuring the time it takes for pulse of energy to travel from a transmitter at that reference point to the sea surface, and back to a receiver. Another way of measuring ocean water height against a known reference point is by using water-sensitive sensors placed on the fixed offshore structure at known distances from the known reference point.

Calibrating satellite altimetry measurements of geoidal height

Analyzing a hydrocarbon reservoir by determining the response of that

A non-magnetic apparatus is disclosed for finding the deflection of the vertical. That apparatus has a device for finding an instrument spatial angle between a reference direction and an instrument characterization direction, and a device for finding a deflection spatial angle between the instrument characterization direction and a direction along a plumb line. Preferably, the device for finding the instrument spatial angle uses a system of gyroscopes. Preferably, the device for finding the deflection spatial angle uses a pendulum.

Apparatuses and methods for making geophysical measurements useful in

A method is disclosed for determining a component of the response of a reservoir to tidal forces (such as the amplitude of variation or delay time) in a hydrocarbons reservoir. That method comprises measuring a variable responsive to tidal forces within the reservoir over a measurement time period, determining a theoretical earth-tide for the reservoir over that measurement time period, and determining the component of the response to tidal forces by comparing the variable measurements and the theoretical earth-tide determinations. Examples of variables that are responsive to the tidal forces are fluid level in a borehole, pressure, and borehole stress. The measurement time period should be sufficiently long so that both a maximum and minimum variable measurement is achieved during that time period (e.g., fourteen or twenty-four hours).

A method and means for determining the amount of stretch in a well logging cable is disclosed. An optical fiber is run into a well with a logging cable and looped back to the surface. A second optical fiber of nominal length is maintained on the surface. A source of monochromatic light is passed through both fibers and recombined. As the well logging tool is raised and lowered in the wellbore, the number of interference fringes passing a fixed point is determined. The change in length of the optical fiber and, therefore, the cable will be equal to 1/2 the number of interference fringes passing a fixed point times the wavelength of light used. A precise determination of vertical location can then be made when this information is combined with information from a surface mounted odometer or encoder. This information further allows a precise determination of interval bulk density or other formation parameters in which it is important to know the depth of a tool.

Interferometric means and method for accurate determination of

A method and apparatus for determining the vertical location of a logging tool in a wellbore is disclosed. An electrical signal is transmitted through a conductor in a well logging cable and a second conductor in the surface. Change in length of the well logging cable is determined by monitoring phase changes in the signals from the first and second conductors.

Growing community of inventors

Santa Ana, CA, United States of America

Peter Graebner