Abstract: A borehole entry apparatus is disclosed. The apparatus includes a dual entry apparatus for use in borehole entry applications, such as slick line and/or wireline (electric wireline) applications. Exemplary embodiments of this invention enable first and second borehole entry apparatuses, such as slick line and wireline tool assemblies, to be simultaneously coupled to a well head. Use of the invention tends to advantageously save rig time and thus reduce the cost of slick line and wireline operations, in particular on a deep-water offshore drilling rig.

Abstract: An improved frac head includes a mixing chamber located in an internal bore downstream of an intercept between the side ports and the internal bore and upstream of a tapered vortex portion of the bore. The tapered vortex reduces the diameter of the bore from a first diameter to a second diameter. The length of the mixing chamber (along the longitudinal axis of the frac head) is advantageously greater than the first diameter. The ratio of the first diameter to the second diameter is further advantageously greater than 1.5. Frac heads in accordance with this invention tend to undergo significantly reduced erosion as compared to frac heads of the prior art thereby improving service life. The invention also advantageously obviates the need for deployment of erosion resistant sleeves (or other wear resistant liners) in the interior of the frac head.

Abstract: A wellhead isolation tool includes a lower mandrel sized and shaped for insertion through a wellhead into a length of wellbore tubing. The wellhead isolation tool includes an improved sealing assembly connected to the lower end of the mandrel. The sealing assembly includes a conventional elastomeric cup deployed about a cup carrier for sealingly engaging an inner surface of the tubing. The sealing assembly further includes an abrasive cleaning ring deployed below the cup (e.g., between the cup carrier and the bull nose). Corrosion products, scale, and/or other debris may be advantageously removed from the tubing via the abrasive action of the cleaning ring, thereby promoting a better seal between the cup and the tubing.

Abstract: An improved frac head includes a mixing chamber located in an internal bore downstream of an intercept between the side ports and the internal bore and upstream of a tapered vortex portion of the bore. The tapered vortex reduces the diameter of the bore from a first diameter to a second diameter. The length of the mixing chamber (along the longitudinal axis of the frac head) is advantageously greater than the first diameter. The ratio of the first diameter to the second diameter is further advantageously greater than 1.5. Frac heads in accordance with this invention tend to undergo significantly reduced erosion as compared to frac heads of the prior art thereby improving service life. The invention also advantageously obviates the need for deployment of erosion resistant sleeves (or other wear resistant liners) in the interior of the frac head.