Abstract: A reamer tool which is capable of removing paraffin scale, ice, salt, calcium, cement, barium and other accumulations from the inside surfaces of oil well pump tubing and casing, which reamer tool may include a housing for suspension in the well tubing or casing; a shaft slidably mounted in the housing for attachment to an impact device; shaft threads provided on the shaft; a lock nut threadibly mounted on the shaft for removably engaging the housing; and a reset spring provided in the housing between the housing and the end of the shaft. Displacement of the shaft in the housing causes the lock nut to engage the housing, and the lock nut rotates on the shaft threads and rotates the housing such that the housing rotates in the well bore or casing and removes the solid blockages from the well bore or casing.

Abstract: A reamer for removing paraffin, scale, ice and other accumulations from the inside surfaces of oil well pump tubing and casing and loosening tubing in a well, which includes a hollow shell or housing having a tapered base, which in a preferred embodiment is fitted with external blades for cutting, the reamer further provided with an enlarged upper internal bore area to accommodate a threaded lock nut, and a threaded shaft projecting into the housing cavity in threadable cooperation with the lock nut and provided with stops to permit limited rotation of the housing and base on the shaft and to prevent the shaft from exiting the housing when fully extended from the housing on the lock nut. When the reamer is lowered by means of a wire line and swivel joint into a length of tubing or casing to a constricted area and the shaft is extended from the housing, a repetitive impact load on the projecting end of the shaft effects rotation of the housing and base, and the blades cut into and remove the deposits.

Abstract: A reamer for removing paraffin, scale, ice and other accumulations from the inside surfaces of oil well pump tubing and casing which includes a hollow, tapered shell or housing fitted with external blades and having an enlarged upper internal bore area to accommodate a threaded lock nut, and a threaded shaft projecting into the housing cavity in threadable cooperation with the lock nut and provided with stops to permit limited rotation of the shell on the shaft and to prevent the shaft from exiting the shell when fully extended from the shell on the lock nut. When the reamer is lowered by means of a wire line and swivel joint into a length of tubing or casing to the constricted area, and the shaft is extended in the shell, a repetitive impact load on the projecting end of the shaft effects rotation of the shell and blades on the shaft to remove the deposits.