Abstract: The present invention relates generally to a gas-compression spray device, wherein the nozzle assembly containing all of the wettable parts is detachable from the body of the spray device.

Abstract: A portable oil recovery apparatus especially for use at de-pressurized wells. It is simple and inexpensive to build and to operate. The apparatus is small and lightweight enough so that it can be transported in a pickup truck for easy movement between well sites, and it can be installed by only two people. The apparatus employs a simple pulley system which dips a string of cups repeatedly into the well bore just deep enough to reach the oil and not deep enough to collect any water. Thus, little or no water is mixed with the recovered product, and no tubing or rods are necessary. The pulley system is automatically operated and requires little supervision and maintenance. The dipping cups are generally cylindrical, each having a central longitudinal tube extending therethrough by which the cup is supported on the string. Each cup has a lid with a plurality of depending fingers which extend down into the cup.

Abstract: A ball sealer for use in flow equalization during fluid injection into oil wells is described which has a layer of thermosetting filament wrapped around its core. After curing, the wrapping layer provides the major part of the ball's strength.