Abstract: This invention relates to a method and apparatus for positioning a selected liquid at the bottom of a well, such as an oil well, while having in the well at least a string of tubing, a sucker rod pump, a string of sucker rods, and a standing valve, without disturbing the rods, pump, tubing, or standing valve. A bypass conduit or shroud surrounds the wall of the tubing at a point above the pump where there is an opening in the wall of the tubing and is carried down, outside the tubing to a point below the conventional mud anchor, into the inlet of an overpressure relief valve. The outlet of the valve empties into the well annulus. If the normal pressure at the bottom of the tubing due to the head of liquid in the tubing is P, the overpressure valve is set to open at a pressure of P+P1, where P1 is a selected value, such as say 100 psi. At the surface, means are provided to close off the top of the tubing.

Abstract: A dispenser for well treating chemicals for pumping oil wells, for attachment to the bottom end of the tubing string, comprises a long cylindrical container, closed at top and bottom, about the same diameter as the tubing and rigidly attachable to the bottom end of the tubing. The bottom end of the chamber is preferably pointed, with at least one opening in the bottom end. The chamber is filled with chunks of solid chemical, of a nature normally used for treating wells. In the normal pumping action, the weight of the well fluid filling the tubing to the surface is supported by the sucker rods during that part of the pumping cycle when the rods are moving up. When the rods are moving down, the weight is carried by the tubing. This varying load on the tubing causes it to lengthen under load, and shorten, so that the bottom end of the tubing raises and lowers through a range of a foot or more.

Abstract: This invention relates to a method and apparatus for positioning a selected liquid at the bottom of a well, such as an oil well, while having in the well at least a string of tubing, a rod pump, a string of rods, and a standing valve, without disturbing the rods, pump, tubing or standing valve. A bypass conduit is connected through the wall of the tubing at a point above the pump and is carried down, outside the tubing to a point below the conventional mud anchor, into the inlet of an overpressure valve. The outlet of the valve empties into the well annulus. If the normal pressure at the bottom of the tubing due to the head of liquid in the tubing is P, the overpressure valve is set to open at a pressure of P+P1, where P1 is a selected valve, such as say 100 psi. At the surface, means are provided to close off the top of the tubing. Means are provided to inject the selected liquid into the top of the tubing at a selected pressure P2 above atmospheric, where P2 may be say 150 psi.