Apparatus for recovering a drill stem

Claim 2

In combination with a drill pipe having upper and lower detached sections, a tool for recovering embedded drill pipe detached from like drill pipe extending from the top of the embedded pipe to a point above ground by lifting said embedded drill pipe from the ground together with said like drill pipes, said tool comprising: a. an upper body portion and a lower body portion in axial alignment; b. a fluid chamber in said tool between said lower and said upper body portions; c. each of said upper and lower body portions having a plurality of longitudinal cavities spaced radially about the axis of the upper and lower body portions and communicating with the fluid chamber; d. said longitudinal cavities being at acute angles to the axis of said tool, the vertex of each of said angles being on the side of said longitudinal cavities nearest the fluid chamber, each of said longitudinal cavities having an opening at the end remote from said fluid chamber, said opening defining a longitudinal groove along the respective body portion; e. wedging members each having a crown of substantially uniform cross section and a shank of bilaterally tapered cross section, one of said bilateral sides having a substantially flat toothed surface wherein said teeth are inclined in the direction of said crown; f. one of said wedging members slidable in each of said longitudinal cavities with the substantially flat toothed surface facinG outwardly whereby the crown of said wedging member is positioned in said longitudinal cavity, the shank of said wedging member projecting laterally and outwardly from said body portion when the crown of said wedging member is slid away from said longitudinal cavity; g. a connector member secured to the upper end of said tool having means connecting said tool to a drill rod for raising and lowering said tool; h. fluid passages in said connector member communicating with said fluid chamber, the longitudinal cavities of said upper and lower body portions communicating with said fluid chamber whereby sufficient fluid from said drill rod may be delivered to said longitudinal cavities to project the wedging members therefrom; and i. said wedging members extending simultaneously from said upper body portion into gripping engagement with said upper detached pipe section and from said lower body portion into gripping engagement with said lower detached pipe section, said upper and lower detached pipe sections extending respectively axially upward and downward from said fluid chamber so that both said upper and lower detached pipe sections are simultaneously axially moved upon axial movement of said drill rod. j. a driving tip secured at the lower end of said tool.

Claim 3

In combination with a drill pipe having upper and lower detached sections, a tool for recovering embedded drill pipe detached from like drill pipe extending from the top of the embedded pipe to a point above ground by lifting said embedded drill pipe from the ground together with said like drill pipe, said tool comprising: a. an upper body portion and a lower body portion in axial alignment; b. a fluid chamber in each of said upper body portions and lower body portions; c. the upper body portion having a plurality of longitudinal cavities spaced radially about its axis and communicating with the fluid chamber in said upper body portion; d. the lower body portion having a plurality of longitudinal cavities spaced radially about its axis and communicating with the fluid chamber in said lower body portion; e. each of the longitudinal cavities of the upper body portion and the lower body portion being at an acute angle to the axis of said tool, the vertex of each of said angles being on the side of said longitudinal cavity nearest the fluid chamber, each of said longitudinal cavities having an opening at the end remote from the fluid chambers, said opening defining a longitudinal groove along the respective body portion; f. wedging members each having a crown of substantially uniform cross section and a shank of bilaterally tapered cross section, one of said bilateral sides having a substantially flat toothed surface wherein said teeth are inclined in the direction of said crown; g. one of said wedging members slidable on each of said longitudinal cavities with the substantially flat toothed surface facing outwardly whereby the crown of said wedging member is positioned in said longitudinal cavity, the shank of said wedging member projecting laterally and outwardly from said body portion when the crown of said wedging member is slid away from said longitudinal cavity; h. a connector member secured to and axially rotatable on the upper end of said tool and comprising a plate of cross section substantially equal to the cross section of said upper body portion and means above said plate connecting said tool to a drill rod for raising and lowering said tool, a plurality of grooves on said plate alignable with the openings of the longitudinal cavities in said upper body portion when said connector member is axially rotated to permit passage therethrough of the shanks of the wedging members in said upper body portion; i. fluid passages in said connector member communicating with the fluid chamber of each of said upper and said lower body portions, the longitudinal cavities of each of said upper and said lower body portions communicating with the fluid chamber of their Respective body portion whereby sufficient fluid from said drill rod may be delivered to said longitudinal cavities to project the wedging members therefrom; j. said wedging members extending simultaneously from said upper body portion into gripping engagement with said upper detached pipe section and from said lower body portion into gripping engagement with said lower detached pipe section, said upper and lower detached pipe sections extending respectively axially upward and downward from said fluid chamber so that both said upper and lower detached pipe sections are simultaneously axially moved upon axial movement of said drill rod; and k. a tapered member at the lower end of said tool having a plurality of grooves positioned around said member and which are aligned with the openings of the longitudinal cavities in the lower body portion to permit passage therethrough of the shanks of the wedging members in said lower body portion.

Claim 4

In combination with a drill pipe having upper and lower detached sections, a tool for recovering embedded drill pipe detached from like drill pipe extending from the top of the embedded pipe to a point above ground by lifting said embedded drill pipe from the ground together with said like drill pipe, said tool comprising: a. an upper body portion and a lower body portion in axial alignment; b. a fluid chamber in each of said upper body portions and lower body portions; c. the upper body portion having a plurality of longitudinal cavities spaced radially about its axis and communicating with the fluid chamber in said upper body portion; d. the lower body portion having a plurality of longitudinal cavities spaced radially about its axis and communicating with the fluid chamber in said lower body portion; e. each of the longitudinal cavities of the upper body portion and the lower body portion being at an acute angle to the axis of said tool, the vertex of each of said angles being on the side of said longitudinal cavity nearest the fluid chamber, each of said longitudinal cavities having an opening at the end remote from the fluid chambers, said opening defining a longitudinal groove along the respective body portion; f. wedging members each having a crown of substantially uniform cross section and a shank of bilaterally tapered cross section, one of said bilateral sides having a substantially flat toothed surface wherein said teeth are inclined in the direction of said crown; g. one of said wedging members slidable on each of said longitudinal cavities with the substantially flat toothed surface facing outwardly whereby the crown of said wedging member is positioned in said longitudinal cavity, the shank of said wedging member projecting laterally and outwardly from said body portion when the crown of said wedging member is slid away from said longitudinal cavity; h. a connector member secured to and axially rotatable on the upper end of said tool and comprising a plate of cross section substantially equal to the cross section of said upper body portion and means above said plate connecting said tool to a drill rod for raising and lowering said tool, a plurality of grooves on said plate alignable with the openings of the longitudinal cavities in said upper body portion when said connector member is axially rotated to permit passage therethrough of the shanks of the wedging members in said upper body portion; i. fluid passages in said connector member communicating with the fluid chamber of each of said upper and said lower body portions, the longitudinal cavities of each of said upper and said lower body portions communicating with the fluid chamber of their Respective body portion whereby sufficient fluid from said drill rod may be delivered to said longitudinal cavities to project the wedging members therefrom; j. said wedging members extending simultaneously from said upper body portion into gripping engagement with said upper detached pipe section and from said lower body portion into gripping engagement with said lower detached pipe section, said upper and lower detached pipe sections extending respectively axially upward and downward from said fluid chamber so that both said upper and lower detached pipe sections are simultaneously axially moved upon axial movement of said drill rod; and k. a tapered member at the lower end of said tool having a plurality of grooves positioned around said member and which are aligned with the openings of the longitudinal cavities in the lower body portion to permit passage therethrough of the shanks of the wedging members in said lower body portion.

Claim 5

A tool as claimed in claim 1 wherein said driving tip is tapered and has grooves positioned around said tapered bit which are aligned with the openings of the longitudinal cavities in the lower body portion to permit passage therethrough of the shanks of the wedging members in said lower body portion.

Claim 6

A tool as claimed in claim 1 wherein the connector member is axially rotatable on the upper end of said tool and comprises a plate on said upper body portion and means above said plate for connecting said tool to a drill rod, a plurality of grooves on said plate alignable with the openings of the longitudinal cavities in said upper body portion when said connector member is axially rotated to permit passage therethrough of the shanks of the wedging members in said upper body portion.