Abstract: Structure is passed into an earth well including a whipstock attached to piping and a retractible anchor. The whipstock includes a number of connected guide assemblies. Erection means is connected at one end to a forward guide assembly and at the other end to an extension projecting to the earth surface. To erect the whipstock, an extension of the erection means is pulled from the surface to cause the guide assemblies to swing into a curved pathway. Thereafter, a drilling tube is passed through the whipstock into the adjacent formation. The whipstock may be deerected by releasing the extension means. Then, the anchor is released and the structure is pulled out of the well.

Abstract: Earth well drilling apparatus including piping in a well, a metal drilling tube within the piping, and a hydraulic jet drilling head secured to the lower end of the tube. A seal is disposed between the piping and the tube. The drilling head is urged downwardly through the piping under hydraulic pressure through a tube bneding assembly laterally extensible from a retracted position substantially within the structure. The hydraulic pressure propels the tube downwardly through the piping and bending assembly to bend the tube and to direct the drilling head laterally toward the formation.