Abstract: A well tool having an anchor device, straddle packers above and below a port and an internal valve which are operated by longitudinal motion in an inflatable packer device. The well tool anchor is armed by a hydraulic operated plug and set upon downward motion in a locating profile groove in a well bore. The tool when attached to a string of tubing can be filled with cement slurry and downward motion used to anchor the well tool in a profile groove in an inflatable packer; to set the straddle packers above and below an access port on an inflatable packer; and then to open a valve to admit cement slurry to the inflatable packer. After filling the inflatable packer with cement slurry, an upward motion is used to close the valve, unset the straddle packers and release the anchor to move to another location where the operation can be repeated. At the conclusion operations, a circulation valve is opened by pressure to reverse out cement slurry from the tubing string.

Abstract: A method for cementing a casing or a liner traversing earth formations comprising the supplemental injection of cement at a pressure greater than the pore pressure in the earth formations during a cementing operation to enchance the effectiveness of the cement integrity by maintaining hydrostatic pressure in an annulus between the pipe and the borehole at a location where the pore pressure of the earth formations is apt to impair the cement integrity in the annulus thereby preventing annular migration of gas or liquids in the cement seal between the earth formations and a liner or casing.

Abstract: An apparatus for producing hot water. A heat exchanger has a primary circuit which receives water from a hot water source and delivers the spent water back to the source. A secondary circuit through the heat exchanger receives unheated water and delivers it as hot tap water. A pump is connected in the line between the hot water source and the primary circuit of the heat exchanger, and a shunt bypass is connected in parallel with the series comprising the pump and the primary circuit of the heat exchanger. A sensing means such as a temperature sensing means senses the commencement of water flow through the secondary circuit and in response thereto operates the pump. Another temperature sensing means measures the temperature downstream from the primary circuit and in response thereto controls the distribution of fluid downstream from the primary circuit of the heat exchanger as between the shunt and the return line to the hot water source.

Abstract: The invention concerns a heat exchanger which is intended for exchanging heat between a first medium passing through a tube system and a second medium which flows around the tube system whereby the tube system comprises a plurality of tubes which are connected in parallel between an inlet and an outlet for the first medium. The tube system is enclosed in a casing which is composed of two halves, which casing is so designed that a channel is formed for the second medium from an inlet to an outlet for this second medium, said channel being formed by mutually substantially parallel parts connected with each other by means of substantially semi-circular parts. The channel comprises the tubes which form the tube system, said tubes having corresponding straight parts and semi-circular parts. The tubes, which may be provided with cross grooves, can be arranged in a direction which is perpendicular to the mean plane of the casing and can be flattened in this direction.

Abstract: A method and apparatus for manufacturing a heat exchanger. A plurality of parallel pipes are advanced from a magazine to an axially slotted open ended shell blank which is radially compressed against the pipes. The contacting surfaces of the pipe openings are then welded together, after which the ends of the package of pipes are immersed in a casting mass, which, after solidifying, is severed along a line therethrough so as to open the pipes at both ends. A wall enclosing each open end is then connected to each end of the pipe package.