Abstract: An offshore structure is disclosed for placement on a sea floor foundation located in a body of water containing moving ice masses and water waves. The offshore structure has a foundation base which contacts the sea floor foundation and at least three stepped stages which are stacked above the foundation base. Each stage has an outer hull to engage moving ice masses and water waves. Additionally, each stage has an outer horizontal diameter which is smaller than the outer horizontal diameter of the stage immediately below it.

Abstract: A method is disclosed for recovering methane from a solid carbonaceous subterranean formation having a production well in fluid communication with the formation and an injection well in fluid communication with the formation. In the method an oxygen-depleted effluent, produced by a cryogenic separator is injected into the formation through the injection well. A first methane-containing gaseous mixture is recovered from the formation through the production well during at least a portion of the time the oxygen-depleted effluent is being injected into the formation. The first methane-containing gaseous mixture has a first methane-desorbing gas volume percent. The injection of oxygen-depleted effluent is ceased and thereafter a second methane-containing gaseous mixture is recovered from the formation which has a second methane-desorbing gas volume percent which is less than the first methane-desorbing gas volume percent.

Abstract: A method for treating a mixture of gaseous fluids within a solid carbonaceous subterranean formation. In some embodiments, the invention provides for the disposal of a strongly adsorbing gaseous fluid within the formation. In other embodiments, the invention provides a means for fractionating a mixture of gaseous fluids within the formation. In still other embodiments, the invention provides for the recovery of a raffinate from the formation which is enriched in relatively weaker adsorbing gaseous fluids. In still other embodiments, the invention provides for the recovery of methane from the formation.

Abstract: An apparatus and method are disclosed for continually and intermittently removing water from a wellbore which penetrates a solid carbonaceous subterranean formation, such as a coalbed, while concurrently removing methane from the formation. The apparatus utilizes a linear access means which facilitates switching the apparatus from a continuous water removal mode of operation to an intermittent water removal mode of operation using wireline retrievable tools.

Abstract: A method for determining the reservoir properties of a solid carbonaceous subterranean formation is disclosed. The method uses field data obtained from an injection/flow-back test, which utilizes a gaseous desorbing fluid, in conjunction with reservoir modeling techniques to determine the reservoir quality and the enhanced methane recovery characteristics of the formation.

Abstract: A method is disclosed for increasing the methane recovery rate through a wellbore which penetrates a coal seam. The invention utilizes the cavitation of the coal seam surrounding the wellbore after a substantial percentage of the original methane-in-place which is available for recovery from the wellbore has been recovered from the coal seam.

Abstract: A method for disposing of radioactive material in a disposal area, which is accessible from the surface through a wellbore which contains a wellbore fluid. The method comprises the steps of: encapsulating the radioactive material within a container, placing the container in the wellbore, passing the container through the wellbore to the disposal area, and equalizing the differential pressure between the wellbore pressure and internal pressure within the container as the capsule descends within the wellbore, prior to the differential pressure reaching a magnitude which would exceed a design collapse rating of the container.

Abstract: A method for disposing of unwanted gaseous fluid components, such as carbon dioxide, oxides of nitrogen, hydrogen sulfide, and oxides of sulfur within a solid carbonaceous subterranean formation, such as a coal seam. The unwanted gaseous fluid components are typically contained in a gaseous process effluent stream which is introduced into the formation.

Abstract: A method is disclosed for recovering crude oil from a subterranean formation. The invention utilizes the introduction of water containing a salt, which is capable of decomposing to generate an oxidant, into the formation. Decomposition conditions and ignition conditions are established within the formation to cause the salt to decompose and to cause ignition within the formation. The in-situ combustion which results assists in the recovery of crude oil from the formation.

Abstract: A method for treating a mixture of gaseous fluids within a solid carbonaceous subterranean formation. In some embodiments, the invention provides for the disposal of a strongly adsorbing gaseous fluid within the formation. In other embodiments, the invention provides a means for fractionating a mixture of gaseous fluids within the formation. In still other embodiments, the invention provides for the recovery of a raffinate from the formation which is enriched in relatively weaker adsorbing gaseous fluids. In still other embodiments, the invention provides for the recovery of methane from the formation.

Abstract: A method is disclosed for increasing the methane recovery rate through a wellbore which penetrates a coal seam. The invention utilizes the cavitation of the coal seam surrounding the wellbore after a substantial percentage of the original methane-in-place which is available for recovery from the wellbore has been recovered from the coal seam.

Abstract: A method for improving the recovery of methane from a solid carbonaceous subterranean formation penetrated by a wellbore, the method comprising the steps of introducing a first fluid into the formation which sorbs to the formation, allowing at least a portion of the first fluid to sorb to the formation, introducing a chemically different second fluid into the formation at a pressure higher than the parting pressure of the formation, relieving pressure within the formation to produce shear failure within the formation, and repeating the introduction of second fluid and the relieving of pressure until a desired permeability of the formation is obtained.

Abstract: A collective fluid inclusions volatiles sample is released from each of a plurality of sedimentary rock samples and analyzed as it is being released to determine composition thereof. Compositions are used for mapping the earth's subsurface.

Abstract: An anti-whirl underreamer comprising a body configured for connection to a drillstring, at least two arms carried by the body which are extendable between a retracted position and a projected position, a movable piston and biased spring assembly for moving the arms, a plurality of cutting elements carried by one of the arms for cutting an axially extending cylindrical sidewall of the borehole within a subterranean formation and for applying a resultant radial force to the body as it rotates, and a low friction bearing region carried by another arm for transmitting the resultant radial force from the body to the sidewall of the borehole during rotation of the underreamer within the borehole. The cutting elements are positioned so that the resultant radial force developed is of sufficient magnitude and direction to substantially maintain the low friction bearing region in contact with the sidewall of the borehole as the underreamer is rotated within the borehole.

Abstract: A method of recovering methane from a solid carbonaceous subterranean formation having a production well in fluid communication with the formation and an injection well in fluid communication with the formation, comprising the steps of passing a gaseous fluid containing at least 60 volume percent nitrogen and at least 15 volume percent oxygen through a membrane separator to produce an oxygen-depleted effluent, pressurizing the oxygen-depleted effluent to a pressure above a reservoir pressure of the solid carbonaceous subterranean formation, injecting the oxygen-depleted effluent into the formation through the injection well, and recovering a fluid comprising methane through the production well.

Abstract: A method is disclosed for using a pressure swing adsorption separator system to provide an oxygen-depleted gaseous effluent for injecting into a suitable solid carbonaceous subterranean formation, such as a coalbed, to enhance the recovery of methane from the formation.

Abstract: A collective fluid inclusions volatiles sample is released from each of a plurality of sedimentary rock samples and analyzed as it is being released to determine composition thereof. Compositions are used for mapping the earth's subsurface.