Abstract: A road block having an extensible bollard that is manually or electronically actuated by a powerful spring force for slow extension, and by both the spring and a power lift for rapid extension.

Abstract: Method and apparatus by which contaminants are removed from a liquid flowing through a filter vessel having an inlet for providing a contaminated liquid flow into one end thereof and an outlet through which filtered liquid can exit the vessel. A filter screen supports a relatively large quantity of particulate filter media within the filter vessel on the filter screen for normal filter operation and captures contaminants by flowing contaminated liquid through the inlet while filtered liquid exits through the filter screen and outlet, leaving the contaminants on the filter media. The system automatically occasionally cleans the media in a unique cleaning cycle, that includes one or a plurality of closed loop flow paths that fluidizes the media within one filter vessel and cleans the media externally of the filter vessel by flowing the fluidized filter media along the closed loop flow path.

Abstract: A stream of contaminated liquid flows into a vessel, through a filter media comprised of pecan hulls, while clean liquid exits the vessel, leaving the contaminants deposited on the filter media. The deposited contaminants are scrubbed from the media by circulating the media along a toroidal flow path within the vessel until the contaminants have been transferred from the media into the liquid. The scrubbing action is achieved by a pump suction which is spaced from a pump discharge. The pump discharges through a perforated nozzle. The nozzle extends through a housing. An annulus is formed between the nozzle and the housing. Dirty scrub water flows from the pump, through the nozzle perforations, into the annulus, and away from the vessel, while at the same time the toroidal flow path is maintained.

Abstract: An injection well has become plugged with an accumulation of undesirable material that is causing the wellhead pressure required to effect a selected minimum flow rate of injection fluid into the formation to have increased to a maximum value. The method of this invention provides a process for treating the plugged formation to remove the accumulated undesirable material. The process requires a plurality of treatment cycles, and in each cycle injection fluid flows into the wellhead for a first time interval while injecting treatment chemical into the flowing injection fluid during a second time interval, with the first time interval being much longer than the second time interval. The well is acidized after a multiplicity of cycles and returned to operation.

Abstract: A stream of contaminated liquid flows into a vessel, and through a filter media, while clean liquid exits the vessel leaving the contaminants deposited on the filter media. The deposited contaminants are scrubbed from the media by circulating the media along a toroidal flow path within the vessel until the contaminants have been transferred from the media into the liquid. The scrubbing action is achieved by a punp suction which is spaced from a pump discharge. The pump discharges through a perforated nozzle. The nozzle extends through a housing. An annulus is formed between the nozzle and the housing. Dirty scrub water flows from the pump, through the nozzle perforations, into the annulus, and away from the vessel, while at the same time the toroidal flow path is maintained.

Abstract: A stream of contaminated liquid flows into a vessel, through a filter media comprised of at least 50% pecan hulls, while clean liquid exits the vessel, leaving the contaminants deposited on the filter media. The deposited contaminants are scrubbed from the media by circulating the media along a toroidal flow path within the vessel until the contaminants have been transferred from the media into the liquid. The scrubbing action is achieved by a pump suction which is spaced from a pump discharge. The pump discharges through a perforated nozzle. The nozzle extends through a housing. An annulus is formed between the nozzle and the housing. Dirty scrub water flows from the pump, through the nozzle perforations, into the annulus, and away from the vessel, while at the same time the toroidal flow path is maintained.

Abstract: A filter device for removing contaminants from liquid flowing therethrough comprising a vessel having an inlet for providing a contaminated liquid flow into the interior thereof and an outlet through which filtered liquid can exit the vessel. A screen means contained within the vessel supports a filter media thereon. A pump has a suction and discharge located within the vessel and respective to the screen whereby the filter media can be fluidized and thereby cleaned without removing the media from the vessel. The scrubbing action transfers the contaminants from the filter media into the scrub water and thereby enables the contaminants to be removed from the vessel by discharging the scrub water therefrom.

Abstract: A filter system has a filter media comprised of particles of filter material contained within the lower end of a vessel. Liquid flows into the upper end of the vessel and down through the filter media, thereby removing unwanted contaminants from the liquid. When the accumulated contaminant load in the filter media reaches a selected value, the filter media is cleaned of contaminants by vigorously circulating the media within the vessel. This scrubbing action transfers the contaminants from the filter media into the scrub water, and thereby enables the contaminants to be removed from the vessel by discharging the scrub water therefrom. All activity is stopped to enable the media to gravitate back to the bottom of the vessel. The cleaned filter is returned to operation.

Abstract: Well treatment method and apparatus for chemically inhibiting downhole production equipment with corrosion inhibitors. Water is separated from the produced well fluid, and the flow rate and corrosive properties of the separated water is measured. Inhibitor solution is then injected into the stream of water in an amount which is proportional to the corrosive measurement of the water, thereby providing the exact amount of chemical treatment required to avoid downhole corrosion. The inhibitor and the water are intimately mixed, and the mixture is flowed into the casing annulus. The conductivity of the produced fluid is measured, and the measurement is used to adjust the rate of flow of the separated water to a value which assures that the mixture of water and inhibitor flow down through the hydrocarbons contained in the casing annulus.