Abstract: A wellbore cementing tool configured for placement in a wellbore or in a drill string, and method of using same. The tool comprises a body having upper and lower members connected by a shear component. A rod is connected to the upper member, and the tool can be lowered with the rod into the wellbore or drill string to a desired depth. At the desired depth, locking means are deployed to lock the tool in position, the tool is sealed, and cement can be injected through the tool to the annulus of the outer casing. In some embodiments the tool is locked using a pushing motion that extends locking members outwardly from the tool to engage the wellbore walls or the inner surfaces of the drill string. Once cementing is completed, the rod is pulled from surface thereby causing the shear component to rupture and the upper and lower members to disconnect, and the upper member can be drawn to surface leaving the rest of the tool downhole.

Abstract: A wellbore cementing tool configured for placement in a drill string, and method of using same. The tool is lowered on a hollow, small-diameter stem into the drill string and contacts the bit, such that the downward pressure on the tool causes a shear pin to shear, resulting in upward movement of an outer sleeve relative to the central body of the tool. The outer sleeve normally holds outwardly biased locking members in a retracted position, but when the outer sleeve is upwardly displaced, slots in the outer sleeve align with the locking members and allow the locking members to extend outwardly through the slots to engage the inner wall of the drill string thereby locking the tool in place. When in position, cement can be injected through the tool and the bit, circulating up the wellbore annulus. The tool does not require rotation to engage the drill string.

Abstract: A wellbore cementing tool configured for placement in a wellbore or in a drill string, and method of using same. The tool comprises a body having upper and lower members connected by a shear component. A rod is connected to the upper member, and the tool can be lowered with the rod into the wellbore or drill string to a desired depth. At the desired depth, locking means are deployed to lock the tool in position, the tool is sealed, and cement can be injected through the tool to the annulus of the outer casing. In some embodiments the tool is locked using a pushing motion that extends locking members outwardly from the tool to engage the wellbore walls or the inner surfaces of the drill string. Once cementing is completed, the rod is pulled from surface thereby causing the shear component to rupture and the upper and lower members to disconnect, and the upper member can be drawn to surface leaving the rest of the tool downhole.

Abstract: A wellbore tool, such as a cementing tool, configured for placement in a wellbore or drill string, and method of sealing the tool in the wellbore or drill string. The tool is lowered on a stem into the wellbore or drill string and contacts a downhole obstacle (the bit when lowered in a drill string), such that the downward pressure on the tool causes a shear pin to shear, resulting in upward movement of an outer sleeve relative to the central body of the tool. The outer sleeve, when upwardly displaced, pushes against a deformable sleeve, and the deformable sleeve then presses outwardly against the inner walls of the wellbore or drill string, sealing the tool therein. The deformable sleeve can be directed outwardly by contacting it during upward displacement of the outer sleeve with an angled surface of the central body.

Abstract: A wellbore cementing tool configured for placement in a drill string, and method of using same. The tool is lowered on a hollow, small-diameter stem into the drill string and contacts the bit, such that the downward pressure on the tool causes a shear pin to shear, resulting in upward movement of an outer sleeve relative to the central body of the tool. The outer sleeve normally holds outwardly biased locking members in a retracted position, but when the outer sleeve is upwardly displaced, slots in the outer sleeve align with the locking members and allow the locking members to extend outwardly through the slots to engage the inner wall of the drill string thereby locking the tool in place. When in position, cement can be injected through the tool and the bit, circulating up the wellbore annulus. The tool does not require rotation to engage the drill string, hence reducing the risk of loosening the threaded connections of lengths of drill pipe.

Abstract: The Advanced Astigmatism Testing Method provides a great improvement over standard Snellen charts in testing vision patients with astigmatism. An ophthalmologist/optometrist has the person view an illuminated sheet of white paper with a pair of L's and placed on the viewing wall. A person with astigmatism will see secondary images of the L's offset horizontally and/or vertically. The vision specialist will then vary lens settings as the patient reports the movement of the vertical or horizontal offset. It has been validated that after the vertical offset diminishes completely that the horizontal offset can likewise be reduced to zero. The lens settings are recorded and serve as the basis for the lens prescription.