Swabbing cup construction for swabbing an oil well pipe
OwnerRobert C. Paulsoninventor
Life of this patent
Estimating the term…
Abstract
An improved swabbing cup construction for use on the mandrel of a swabbing tool for clearing liquids and particulate matter, and initiating the flow of oil, from an oil well pipe. The improved cup construction is manually adjustable on the mandrel to compensate for wear of the cup to greatly increase the life of the cup and to substantially facilitate the swabbing procedure for an oil well pipe. The method comprises the steps of observing the wear of the swabbing cup and of manually increasing the outer diameter of the swabbing cup while it is on the mandrel and during swabbing operations of said oil well pipe.
Claims9
In an oil well swabbing tool for raising a mixture of liquids and particulate matter such as sand from an oil well pipe in which said tool comprises a cylindrical mandrel, a swabbing cup construction for mounting on said mandrel, said cup construction comprising first and second elements adjustably secured together, said first element comprising a rigid cylindrical member having an internal diameter substantially equal to the outer diameter of said mandrel for slidably mounting said cylindrical member on said mandrel, said first element further comprising an elastomeric material annular member molded circumferentially about one end portion of said cylindrical member, at least the other end portion of said cylindrical member being externally threaded, said annular member having leading and trailing surfaces extending radially outwardly and axially toward said other end portion of said cylindrical member, said trailing surface of said annular member further having the shape of the surface of a frustrum, the maximum diameter of said annular member being substantially equal to the inner diameter of said oil well pipe, said second element comprising a substantially rigid ring member internally threaded with threads complimentary to the threads on said other end portion of said cylindrical member, said ring member having radially extending leading and trailing surfaces, said leading surface of said ring member further extending in an axial direction toward said trailing surface thereof and being generally shaped as the surface of a frustrum, the maximum diameter of said ring member being substantially less than the maximum diameter of said annular member, said ring member being threaded on said other end portion of said cylindrical member with said leading surface of said ring member directed toward surface engagement with said trailing surface of said annular member, and the surface of a frustrum shape of said leading surface of said ring member relative to the surface of a frustrum shape of said trailing surface of said annular member providing increasing radial expansion of said annular member upon progressively greater threading movement of said ring member on said cylindrical member toward and against said annular member.
In an oil well swabbing tool for raising a mixture of liquids and particulate matter such as sand from an oil well pipe and for drawing a partial vacuum in said pipe below said tool, said tool comprising an elongated cylindrical mandrel having a cable connection at the upper end thereof and at least one swabbing cup construction, said swabbing cup construction comprising a first part and a second part carried on said first part, said first part comprising a rigid cylindrical member slidably mounted on said mandrel for limited sliding movement thereon below said cable connection, said cylindrical member being externally threaded, said first part further comprising an annular member of an elastomeric material molded about a substantial axial extent of said cylindrical member at the lower portion thereof, said annular member comprising leading and trailing surfaces shaped as the surface of frustrums, said leading and trailing surfaces of said annular member directed radially outwardly and axially upwardly of said cylindrical member and terminating in an outer peripheral portion of an initial diameter substantially equal to the inner diameter of said oil well pipe, said second part comprising a rigid ring having internal threads complimentary to said externally threaded cylindrical member and a leading surface shaped as the surface of a frustrum, said second part being threaded on said cylindrical member with said leading surface of said second part directed toward said trailing surface of said annular member, relative to the axis of said first and second parts any radially extending line on said leading surface of said second part being disposed at a greater acute angle than any radially extending line on said trailing surface of said annular member, and the outer diameter of said ring being less than any diameter of said peripheral portion of said annular member.
Dependencies are inferred from the claim text.