초록 ▼

A small and easily portable apparatus for safely descending from a high elevation, comprising a drum rotatably mounted on a mounting frame; a body securing device for securing the mounting frame to the body of a user; and a line wound around the drum, having an end for attachment to a fixed object a

A small and easily portable apparatus for safely descending from a high elevation, comprising a drum rotatably mounted on a mounting frame; a body securing device for securing the mounting frame to the body of a user; and a line wound around the drum, having an end for attachment to a fixed object at the high elevation; such that the user may attach the line to a fixed object and safely descend from the high elevation.

대표청구항 ▼

A small and easily portable apparatus for safely descending from a high elevation, comprising a drum rotatably mounted on a mounting frame; a body securing device for securing the mounting frame to the body of a user; and a line wound around the drum, having an end for attachment to a fixed object a

A small and easily portable apparatus for safely descending from a high elevation, comprising a drum rotatably mounted on a mounting frame; a body securing device for securing the mounting frame to the body of a user; and a line wound around the drum, having an end for attachment to a fixed object at the high elevation; such that the user may attach the line to a fixed object and safely descend from the high elevation. establishing the selected quantity of liquid to be lifted during the liquid removal phase to extend the liquid removal phase to a duration which maximizes the amount of gas produced in each gas recovery cycle. 11. A method as defined in claim 1 further comprising: preventing the accumulated liquid in the production chamber and the lift chamber from flowing into the casing chamber while the pressurized gas is flowed into the production chamber during the liquid removal phase. 12. A method of recovering natural gas from a well extending from an earth surface to a subterranean earth formation from which gas and liquid are produced at a bottom of the well and transported from the bottom of the well through at least one of a plurality of separate chambers extending between the well bottom and the earth surface, the method executed by using a multiple phase production cycle which includes a liquid removal phase in which pressurized gas is introduced into one chamber to lift liquid from the well bottom through one chamber to the earth surface, and which also includes: an evacuation phase during which a relatively low gas pressure which is less than atmospheric pressure is applied to each of the plurality of chambers at the earth surface to communicate through the chambers to the well bottom and on an earth formation from which the gas and liquid are produced. 13. A method as defined in claim 12 further comprising: including a casing chamber, a production chamber and a lift chamber in the plurality of chambers; establishing fluid communication between the casing chamber and the earth formation from which the gas and liquid are produced; and applying the relatively low gas pressure to the casing chamber, the production chamber and the lift chamber simultaneously during the evacuation phase of the production cycle. 14. A method as defined in claim 12 further comprising: including a casing chamber, a production chamber and a lift chamber in the plurality of chambers; establishing fluid communication between the casing chamber and an earth formation from which the gas and liquid are produced; and applying the relatively low gas pressure to the casing chamber at the earth surface throughout the liquid removal phase and the evacuation phase of the production cycle. 15. A method as defined in claim 14 further comprising: accumulating gas and liquid from the earth formation within the casing chamber at the well bottom during the evacuation phase; and flowing liquid from the casing chamber into the production chamber during the evacuation phase. 16. A method as defined in claim 14 further comprising: flowing at least some of the gas directly out of the casing chamber to be sold during the evacuation phase. 17. A method as defined in claim 16 further comprising: admitting a selected quantity of liquid from the casing chamber into the production chamber prior to executing the liquid removal phase; and preventing the liquid admitted into the production chamber from flowing back from the production chamber into the casing chamber during the liquid removal phase. 18. A method as defined in claim 12 wherein the plurality of chambers include a casing chamber, a production chamber and a lift chamber which are separate from one another, the method further comprising: establishing fluid communication between the casing chamber and the earth formation containing the liquid and gas to be produced; and including a production phase in the gas recovery cycle during which relatively low gas pressure is applied to the casing chamber, relatively high gas pressure is applied to the production chamber and gas is delivered from the lift chamber at the earth surface. 19. A method as defined in claim 12 wherein the plurality of chambers include a casing chamber, a production chamber and a lift chamber which are separate from one another, the method further comprising: establishing fluid communication between the c