Abstract: A wellbore is formed with the lower marginal end portion thereof being turned substantially horizontally, thereby exposing a relatively large surface area of the pay zone to the cased borehole. A jet perforating gun has a member extending radially therefrom and into close proximity to the inside peripheral wall surface of the casing, and the shaped charges thereof are oriented so that they fire and perforate in a direction opposed to the arm. The gun is run downhole into proximity of the pay zone with the shaped charges being directed in a substantially downward direction so that when the gun is fired, the casing is perforated with the perforations extending downwardly into the hydrocarbon bearing formation. This expedient enables the perforated formation to be produced without flowing any of the unconsolidated formations into the wellbore.

Abstract: A wellbore is formed with the lower marginal end portion thereof being turned substantially horizontally, thereby exposing a relatively large surface area of the pay zone to the cased borehole. A jet perforating gun has a member extending radially therefrom and into close proximity to the inside peripheral wall surface of the casing, and the shaped charges thereof are oriented so that they fire and perforate in a direction opposed to the arm. The gun is run downhole into proximity of the pay zone with the shaped charges being directed in a substantially downward direction so that when the gun is fired, the casing is perforated with the perforations extending downwardly into the hydrocarbon bearing formation. This expedient enables the perforated formation to be produced without flowing any of the unconsolidated formation into the wellbore.

Abstract: A vent assembly for use in a tubing string located downhole in a borehole. The vent assembly is moved to the open position by a fishing tool attached to a slick line and run downhole through the tubing string into engagement therewith. The vent assembly includes an elongated, annular piston which slidably and sealingly engages the inside peripheral wall of a housing. The housing has radial ports which are covered by spaced seals located on the annular piston. One of the seals is larger in diameter than the other, thereby presenting different surface areas to the bottomhole fluids of the borehole within which the assembly is located. A sliding valve element underlies the annular piston and covers a relatively small bleed port so that when the valve element is moved by the wireline actuated tool to uncover the bleed port, the pressure differential across the housing is equalized.