Apparatus and method for digging deep trenches having parallel generally vertical walls in solid rock such as limestone. The apparatus includes a transport means for providing support and for moving along a traverse on the earth's surface while cutting a trench along that traverse. The transport carries a boom which may be articulated into the ditch being cut and a pair of rock cutterwheels carried on the end of the boom and assembled so that the outermost cutter teeth are wider than any other p...

A method of cementing oil, gas or water wells and the like, wherein a solution, dispersion, suspension, or the like of a cement additive in water is prepared at a predetermined concentration of additive and is thereafter mixed with dry powdered cement to form a cement slurry, and a sample of the additive-water mixture is analyzed prior to its being mixed with the cement, to verify that the additive-water mixture contains the desired concentration of additive. The analysis of the additive-water m...

There is disclosed herein a telescoping mast assembly adapted for use with drill rigs and the like. The mast assembly comprises multiple sections, said sections being adapted for nesting one within the other in the telescoped-to-the-closed condition and each section comprising mutually convergent corner leg members which, when said mast assembly is extended, form concentric and in-line arrangements of the corner leg members from the base to the crown of the mast. Means are provided for connectin...

An earth working apparatus having a ripper for loosening earth and the like. An impact member is associated with the ripper to provide a cushioned transfer of impact force for improved earth working operation.

This invention relates to an air supported double wall structure and a method of making same, including the preparation of a first and second plastic sheet; providing said plastic sheets with a multiplicity of predeterminedly located paired holes which determines the configuration of the final inflated structure; placing the plastic sheets opposite one another; mounting a multiplicity of grommeting means, provided with segments of cords, on the external surfaces of said plastic sheets over said ...

A light weight locking structure for a suspended ceiling construction of T-shaped strip grid profile bars supportively engaged by nodal plates having radiating arms in which the arms terminate in upwardly bent locking projections, and the profile bars are provided with slots in the cross-bar of the T for cooperatively receiving the locking projections of the associated arm. After engagement of the locking projections in the slots of the respective profile bar, the projections are bent over to ri...

A method of completing a sandy production zone located downhole in a borehole by spotting a polymeric agent adjacent to the production zone, perforating the casing adjacent to the zone, and simultaneously increasing the pressure on the agent to a value which exceeds the formation pressure so that the polymeric agent is forced back up into the perforations as they are formed by the hot jets issuing from the gun. The polymeric agent is allowed to "set up" into a porous self-supporting mass, the pr...

Recovery of oil from subterranean oil reservoirs by waterflooding employing an alkaline agent and a sulfonate surfactant. An aqueous initiation slug containing an alkaline agent selected from the group consisting of alkali metal and ammonium hydroxides is injected into the reservoir via a suitable injection system. Thereafter an aqueous surfactant slug is injected into the reservoir behind the initiation slug. The surfactant slug contains a sulfonate surfactant and an alkaline agent. Subsequent ...

A method for plugging the more permeable strata of a subterranean formation of nonuniform permeability in which an aqueous solution of a gelling agent and an aqueous solution containing both a gelling agent and an alkali metal silicate are injected into the formation. The two solutions can be injected in any order, and are separated by a slug of an inert aqueous spacer liquid. The first injected solution preferably also contains a polymer thickener.

A rock boring machine of the kind consisting of a rotatable headplate on the front face of which is mounted a plurality of rotatable disc cutters, each disc cutter comprising an annular body, a plurality of cutting segments located on and substantially encircling the annular body around the periphery thereof, and removable clamping means for securing the cutting segments to the annular body. Each cutting segment is provided with a suitable formation adapted to engage with a complemental formatio...