초록 ▼

The present invention discloses and claims methods and apparatus for forming an opening or a window in a downhole tubular for the subsequent formation of a lateral wellbore. In one aspect of the invention, a thermite containing apparatus is run into the wellbore on a wire line and a widow is subsequ

The present invention discloses and claims methods and apparatus for forming an opening or a window in a downhole tubular for the subsequent formation of a lateral wellbore. In one aspect of the invention, a thermite containing apparatus is run into the wellbore on a wire line and a widow is subsequently formed in casing wall. In another aspect of the invention, the apparatus includes a run-in string or drill stem with a drill bit attached to a lower end thereof. A diverter, like a whipstock is attached temporarily to the drill bit with a mechanically shearable connection. At a lower end of the whipstock, a container is formed and connected thereto. The container is designed to house a predetermined amount of exothermic material at one side thereof adjacent the portion of casing where the window or opening will be formed. A telescopic joint extends between the bottom of the container and an anchor therebelow and the telescopic joint is in an extended position when the apparatus is run into a wellbore. In use, the exothermic material, like thermite is ignited and the window is formed in the casing. The telescopic joint is then caused to move to a second position, locating the whipstock adjacent the newly formed casing window.

대표청구항 ▼

The present invention discloses and claims methods and apparatus for forming an opening or a window in a downhole tubular for the subsequent formation of a lateral wellbore. In one aspect of the invention, a thermite containing apparatus is run into the wellbore on a wire line and a widow is subsequ

The present invention discloses and claims methods and apparatus for forming an opening or a window in a downhole tubular for the subsequent formation of a lateral wellbore. In one aspect of the invention, a thermite containing apparatus is run into the wellbore on a wire line and a widow is subsequently formed in casing wall. In another aspect of the invention, the apparatus includes a run-in string or drill stem with a drill bit attached to a lower end thereof. A diverter, like a whipstock is attached temporarily to the drill bit with a mechanically shearable connection. At a lower end of the whipstock, a container is formed and connected thereto. The container is designed to house a predetermined amount of exothermic material at one side thereof adjacent the portion of casing where the window or opening will be formed. A telescopic joint extends between the bottom of the container and an anchor therebelow and the telescopic joint is in an extended position when the apparatus is run into a wellbore. In use, the exothermic material, like thermite is ignited and the window is formed in the casing. The telescopic joint is then caused to move to a second position, locating the whipstock adjacent the newly formed casing window. of the substrate is selected from the group consisting of ceramics and plastic resins. 3. The microvalve device as claimed in claim 1 in which the flow channel has a cross sectional area equivalent to the area of a circle of 0.1 to 1 mm diameter. portion (9'), which forms an evaporator (2) for transporting a second cooling medium. 8. A device according to claim 7, wherein the evaporator (2) is provided between the precooler (1) and said separation part (3). 9. A device according to claim 8, further comprising closed channels (12, 13), which extend through said separation part (3) and are arranged to enable the transportation of the second cooling medium to and from the evaporator (2). 10. A device according to claim 7, wherein said separation part (3) is provided between the precooler (1) and the evaporator (2). 11. A device according to claim 7, wherein the first channel (5) extends to an outlet (6) of said separation part (3) and is connected via an external or internal conduit (7, 22) to the second channel (9) of the precooler (1), wherein the conduit (7) is arranged to convey the gaseous medium from said outlet (6) to the second channel (9) of the precooler for heat exchange with the incoming gaseous medium. 12. A device according to claim 1, wherein at least a part of the second channel (9') is formed by two of said plates (14), which are positioned adjacent to each other in such a manner that said part of the second channel (9') extends therebetween, and wherein said separation part (3) of the first channel (5) extends on both sides of said part of the second channel (9'). 13. A device according to claim 7, wherein at least a part of the second channel (9') is included by the second channel portion. 14. A device according to claim 1, wherein the plates (14) included by said separation part (3) are arranged such that each third plate interspace, which is formed between adjacent plates (14), forms a part of the second channel (9') whereas the remaining plate interspaces, which are formed between adjacent plates (14), form a part of the first channel (5). 15. A device according to claim 1, wherein at least one of said plate interspaces forming said separation part (3) includes surface enlarging means (23). 16. A device according to claim 12, wherein said part of the second channel (9') is included by a second channel portion which forms an evaporator (2) for transporting a second cooling medium. 17. A plate package for treating a substantially gaseous medium comprising a plurality of parallel plates (14) connected to each other and adjacent to each other such that the plates, by having port holes therein, form a first channel (5), the first channel being arranged to transport the gaseous medium, and at least a second channel (9, 9'), the second channel being separated from but in heat transferring contact with the first channel (5) and being arranged to transport a cooling medium for cooling the gaseous medium, wherein at least a part (3) of the first channel (5) forms a separation part and is arranged to separate liquid from the gaseous medium, said separation part (3) of the first channel (5) being formed by a plurality of plate interspaces between a part of said plates (14), wherein at least one of the plates (14), delimiting one of said plate interspaces, is arranged to be passed by the gaseous medium on both sides thereof.