| Patent Number |
Title Of Patent |
Date Issued |
| 5109927 |
RF in situ heating of heavy oil in combination with steam flooding |
May 5, 1992 |
| A subterranean hydrocarbon-bearing formation is preheated by application of RF energy to the formation so that subsequent steam flooding will more effectively sweep the hydrocarbons from the formation without steam override occurring. |
| 4962665 |
Sampling resistivity of formation fluids in a well bore |
October 16, 1990 |
| Formation fluid is received in and passed through a sonde supported by an armored well logging cable at a depth of interest in a well bore. Periodically, samples of the formation fluid are taken. Higher density portions of the fluid, which represent formation fluid and/or mud filtrat |
| 4660636 |
Protective device for RF applicator in in-situ oil shale retorting |
April 28, 1987 |
| In the in-situ retorting of oil shale using radio frequency electrical energy, an applicator is inserted into a borehole and energized at a radio frequency. A protective device protects the applicator from expansion of the oil shale formation. The protective device includes an end plate |
| 4638862 |
Means and method for producing hydrocarbons from an earth formation during the RF retorting of a |
January 27, 1987 |
| A method for obtaining a hydrocarbon liquid from a hydrocarbon strata of an earth formation traversed by a borehole wherein the hydrocarbon strata is subjected to RF electromagnetic energy retorting by locating metal tubing formed in a predetermined manner in that portion of the borehole |
| 4636731 |
Propagation anisotropic well logging system and method |
January 13, 1987 |
| An anisotropic well logging system includes a well logging tool including a first transmitter coil spatially arranged within the well logging tool in a first predetermined manner and a second transmitter coil spatially arranged within the well logging tool in a second predetermined manne |
| 4609873 |
Dielectric well logging system with at least three transmitter coils and at least two receiver c |
September 2, 1986 |
| A dielectric well logging system is provided to determine dielectric constant and resistivity in formations invaded by water to determine oil and water saturations of the formations. Plural transmitters are activated in a time division multiplex manner and sensed by receiver coils. The |
| 4592423 |
Hydrocarbon stratum retorting means and method |
June 3, 1986 |
| The system and the method of the present invention for the in-situ retorting of a hydrocarbon stratum, having a borehole traversing it, with electrical energy at a radio frequency (hereinafter referred to as rf energy) includes apparatus for conducting the rf energy from an rf energy |
| 4573805 |
Method for measuring temperature of a hydrocarbon stratum subjected to RF electromagnetic energy |
March 4, 1986 |
| A method for measuring temperatures of a hydrocarbon stratum subjected to RF electromagnetic energy includes in one embodiment sensing the temperature at different positions within an inner conductor of an applicator used to radiate the RF electromagnetic energy into the hydrocarbon |
| 4553592 |
Method of protecting an RF applicator |
November 19, 1985 |
| A method which protects an RF applicator during the in-situ RF retorting of a hydrocarbon stratum from a borehole which traverses the hydrocarbon stratum including lining that portion of the borehole traversing the hydrocarbon stratum with a non-conductive high temperature material. |
| 4524826 |
Method of heating an oil shale formation |
June 25, 1985 |
| A method of heating an oil shale formation to produce shale oil includes radiating RF energy into the oil shale formation for a predetermined first time interval from a first borehole which penetrates said oil shale formation. Shale oil is produced when available during said first time |
| 4513815 |
System for providing RF energy into a hydrocarbon stratum |
April 30, 1985 |
| A system for emitting electromagnetic energy at a radio frequency into a hydrocarbon stratum of earth formation traversed by borehole includes a source having impedance matching capability, which provides electromagnetic energy at a radio frequency, and an applicator which is used to |
| 4122709 |
Digital torque meter |
October 31, 1978 |
| A torque meter for measuring the torque of a rotating shaft includes at least two sensing devices providing pulses corresponding to the rotation of the shaft. A pulse source provides clock pulses. A circuit receiving th pulses from the sensors and the clock pulses provides groups of cloc |
