Abstract: A well perforating apparatus has a first perforating gun section, a second perforating gun section, and a longitudinally collapsible unitary section connected between the first and second perforating gun sections. The unitary section can include a deformable member, or a frangible member, or a flexible member. One specific such member is a cable, such as implemented with a length of wireline material or slickline material. In a method of perforating a well having a plurality of zones to be perforated, a well perforating apparatus is lowered into the well. This includes separating a first perforating gun section from a second perforating gun section such that one gun section is adjacent one zone to be perforated and such that the other perforating gun section is adjacent another zone to be perforated.

Abstract: A suspended ceiling has a grid formed from a number of parallel first support sections and a number of parallel second support sections extending perpendicular to and between the first support sections.The support sections are extruded from a metal having good heat conduction properties and are adapted to be interconnected by cruciform connectors thereby to form a lattice of regular quadrilaterals. The grid carries a pipe through which flows a heated fluid and which extends in a serpentine path along an upper surface of the first support sections and along upper surface of the second support sections at the edges of the ceiling. The pipe is secured in good heat conducting relationship to the first support sections by a series of clips. Ceiling panels made from a heat-insulating material occupy the spaces between the first and second support sections. The supporting grid thereby constitutes a heating system for the room below the ceiling.

Abstract: The invention relates to a metal ceiling panel for a heat radiating ceiling which can be arranged in a coplanar array with like ceiling panels or it can be secured to the upper side of selected metal sheets which are arranged in a coplanar array. The panel of the invention has a central, lengthwise extending broad rib formation defining a channel of part-cylindrical form which is adapted to receive a heating pipe in good heat conducting contact therewith. The rib formation also has portions adapted to receive the ends of a one-piece band used to hold the heating pipe in the channel. The portions of the rib which receive the ends of a one-piece band may have enlarged inner end portions adapted to receive pins inserted at the ends of the panels for aligning the ends of adjoining panels in a line extending parallel to the pipe. The edges of the panels may have a tongue and groove arrangement for engaging adjoining panels.

Abstract: A technique is described which enables agglomerating coals (caking coals) to be flash pyrolyzed in a fluidized-bed reactor without agglomerates forming in the fluidized-bed. The technique requires the inert particles of the fluidized-bed to be coarser and denser than the particulate coal being pyrolyzed. With this arrangement the momentum of the inert particles in the fluidized-bed is believed to destroy the agglomerates as they form.