Abstract: A packer assembly for a production well is described. The packer assembly includes one or more packer elements set to engage and seal the inner surface of a well casing, where a production tube runs through the one or more packer elements and provides a fluid path to the surface. A chemical inlet above the one or more packer elements connects to a chemical flow path through the one or more packer elements and a chemical outlet below the packer assembly.

Abstract: A system and method are described to determine a pump intake pressure in a petroleum producing well. The system includes a controller at a well site of the petroleum producing well, a system of valves connected to pipes collecting the well casing gas produced from a casing annulus of the producing well. The valves are controlled by the controller and a pressure sensor measures the pressure of the well casing gas in the casing annulus. The system determines a well casing gas flow rate by measuring a build-up pressure of the well casing gas in a casing annulus when a valve from the casing annulus is closed. A fluid level in the casing of the well is determined using a pressure wave created in the well casing gas using the controller and the one or more valves. A fluid gradient correction factor is found using an actual fluid level in the casing. The controller then calculates the pressure using the gas flow rate, the fluid level and the fluid gradient correction factor.