Abstract: A method for making gravel filters in oil well bores. The first step involves ascertaining the location of a producing formation adjacent to a cemented casing in a well bore. Then, a portion of the casing adjacent to the producing formation is cut, enlarging the bore adjacent to the producing formation. Subsequently, a sufficient amount of gravel is deposited in the enlarged portion of the bore to create an effective filter for a producing tube with a screen at its distal end. The distal end is positioned adjacent to the cemented bottom of the well bore. The method maximizes the diameter of the gravel deposited by delivering it exteriorly of the screen of the producing tube and through the annular space defined and sealed between the screen and the casing.

Abstract: A method for making gravel filters in oil well bores by ascertaining the location of a producing formation adjacent to a cemented casing in a well bore. Water formation may exist between oil formations. The next step involves cutting a portion of the casing adjacent to the producing formation. A section mill equipment is used to cut, continuously, the cemented casing. The bore adjacent to the producing formation is enlarged. An underreamer is utilized to remove the surrounding cemented space and enlarge the oil well diameter. Then a sufficient amount of gravel is deposited in the enlarged portion of the bore to create an effective filter for a producing tube with a screen at its distal end positioned adjacent to the cemented bottom of the well bore.

Abstract: A section mill for casings used in oil wells to cut predetermined portions for repair purposes. An elongated cylindrical assembly is inserted through the casing and it includes at least two spaced apart apertures with one blade member pivotally mounted within each aperture. First and second coaxially disposed tubular shaft assemblies with teethed portions to coact with the blades to selectively move them between two extreme position upon the application of a pressurized fluid. The fluid needs to overcome the spring biased applied to the shaft assemblies. The first set of blades is stopped and slidably rotates in contact with the internal surface of the casing. The second set cuts through the casing with one end and sections the casing with the other end. After wearing off, the first set of blades continues the sectioning work.

Abstract: A packing tool assembly for sealing oil well bores that basically includes an elongated tubular member, two deformable sealing units, two stopper ring members and a cylinder member. A setting tool transports the packing tool assembly and the former stays in the oil well bore during the preparation and sealing phases without requiring the typical time-consuming withdrawal. When the preparation phase has been completed, the packing tool assembly is disengaged from setting tool and the sealing phase starts immediately. The latch members of the setting tool are received within the internal locking channels of the cylinder member. The setting tool is then rotated to cause the cylinder member to advance towards stopper ring members, deforming outwardly the sealing units. The latter are expanded against the walls of oil well bore. Once expanded the sealing units, the setting tool is removed and a tool for the extraction phase is inserted.

Abstract: A packing tool assembly for sealing oil well bores that basically includes an elongated tubular member, two deformable sealing units, two stopper ring members and a cylinder member. A setting tool transports the packing tool assembly and the former stays in the oil well bore during the preparation and sealing phases without requiring the typical time-consuming withdrawal. When the preparation phase has been completed, the packing tool assembly is disengaged from setting tool and the sealing phase starts immediately. The latch members of the setting tool are received within the internal locking channels of the cylinder member. The setting tool is then rotated to cause the cylinder member to advance towards stopper ring members, deforming outwardly the sealing units. The latter are expanded against the walls of oil well bore. Once expanded the sealing units, the setting tool is removed and a tool for the extraction phase is inserted.

Abstract: An underreamer with pressurized water activated lateral cutters pivotally mounted thereon and being spring biased to urge them in longitudinal alignment with the underreamer. A removable constrictor socket is cooperatively mounted adjacent to the distal end of the piston rod so that a user can select one of several designs depending on the magnitude of drill fluid pressure to be applied on the bottom of the well. The lower end of the underreamer is provided with several contiguous cutting teeth arranged in a circle with a relatively small separation inbetween so that it may continue to work even if the well collapses. The cutting teeth enhance the turbulence of the drill fluid. The underreamer is lubricated with drilling fluid applied up to a predetermined pressure without opening the lateral cutters. After a given predetermined amount of pressure, the lateral cutters open perpendicularly.

Abstract: An underreamer with pressurized water activated lateral cutters pivotally mounted thereon and being spring biased to urge them in longitudinal alignment with the underreamer. A removable constrictor socket is cooperatively mounted adjacent to the distal end of the piston rod so that a user can select one of several designs depending on the magnitude of drill fluid pressure to be applied on the bottom of the well. The lower end of the underreamer is provided with several contiguous cutting teeth arranged in a circle with a relatively small separation inbetween so that it may continue to work even if the well collapses. The cutting teeth enhance the turbulence of the drill fluid. The underreamer is lubricated with drilling fluid applied up to a predetermined pressure without opening the lateral cutters. After a given predetermined amount of pressure, the lateral cutters open perpendicularly.