Method and apparatus for cleaning internal surfaces of downhole casing strings and other tubular goods

Abstract

A downhole cleaning assembly and method of cleaning a tubular. Generally, the downhole assembly is connected to a work string concentrically located within a casing string. In one embodiment, the downhole assembly comprises a tool body operatively connected to a work string. At least one pad member is connected to the tool body, with the pad member having cutting technology, such as, for example, hardened elements or “inserts,” (commonly used in connection with drill bits) along certain outer peripheral surfaces of the pad member. Such cutting technology includes, but is not necessarily limited to, Polycrystalline Diamond Compact (PDC) inserts, tungsten carbide inserts or diamond bit elements commonly used in connection with drill bit technology.

1 . A pad member adapted to be received on a scraper tool comprising at least one cutting element disposed on said pad member. 
   
   
       2 . The pad member of  claim 1 , wherein said at least one cutting element comprises at least one polycrystalline diamond compact insert. 
   
   
       3 . The pad member of  claim 1 , wherein said at least one cutting element comprises at least one tungsten carbide insert. 
   
   
       4 . The pad member of  claim 2 , wherein said pad member further comprises:
 a. a body section having at least one bore disposed in said body section; and   b. a polycrystalline diamond compact insert received within each of said at least one bore.   
   
   
       5 . The pad member of  claim 3 , wherein said pad member further comprises:
 a. a body section having at least one recess in said body section; and   b. a tungsten carbide insert received within each of said at least one recess.   
   
   
       6 . An apparatus for cleaning cement and hardened debris from the inner surface of casing and other tubular goods comprising:
 a. a body having an outer peripheral surface;   b. at least one pad member disposed along the outer peripheral surface of said body; and   c. at least one cutting element disposed on said pad member.   
   
   
       7 . The apparatus of  claim 6 , wherein said at least one cutting element comprises at least one polycrystalline diamond compact insert. 
   
   
       8 . The apparatus of  claim 6 , wherein said at least one cutting element comprises at least one tungsten carbide insert. 
   
   
       9 . The apparatus of  claim 7 , wherein said pad member further comprises:
 a. a body section having at least one bore disposed in said body section; and   b. a polycrystalline diamond compact insert received within each of said at least one bore.   
   
   
       10 . The apparatus of  claim 8 , wherein said pad member further comprises:
 a. a body section having at least one recess in said body section; and   b. a tungsten carbide insert received within each of said at least one recess.   
   
   
       11 . A downhole assembly for use in a well bore on a work string concentrically located within a casing string, said downhold assembly comprising:
 a. a mandrel operatively connected to said work string, said mandrel having a longitudinal through-bore and a recess along its outer peripheral surface;   b. pad member received within said recess, said pad member having an opening formed therein;   c. a cutting element, operatively positioned within said opening of said pad member; and   d. a biasing member, operatively positioned between said mandrel and said pad member, adapted for biasing said cutting element against the inner diameter of said well bore.   
   
   
       12 . The downhole assembly of  claim 10 , wherein said at least one cutting element comprises at least one polycrystalline diamond compact insert. 
   
   
       13 . The downhole assembly of  claim 10 , wherein said at least one cutting element comprises at least one tungsten carbide insert.