Mechanically modified filter cake

Abstract

A down hole tool including a compression surface, a compression surface axis, and at least one support member configured to attach the compression surface to a well drilling tool assembly, wherein the extendable support member is extendable by an extension force provided to the support member. The down hole tool is rotable relative to an axis of the well drilling tool assembly, and as the well drilling tool assembly rotates, the at least one compression device exerts a lateral force along a sidewall of a wellbore. Also, a method of forming filter cake comprising releasing a drilling fluid and contacting the drilling fluid with a mechanical pressure on the sidewall of the wellbore and the drilling fluid.

1 . A method of forming filter cake comprising:
 releasing a drilling fluid, wherein the drilling fluid comprises at least one of a group consisting of compressible, deformable, and encapsulated particles, wherein the drilling fluid flows along a sidewall of the wellbore; and   contacting the drilling fluid with a compression surface of a well drilling tool assembly along the sidewall of the wellbore.   
   
   
       2 . The method of  claim 10 , further comprising:
 embedding the compressible and deformable particles mechanically into the sidewall of the wellbore;   
   
   
       3 . The method of  claim 10 , further comprising:
 breaking the encapsulated particles under a mechanical pressure of the compression surface;   wherein upon the breaking, the encapsulated particles release at least one first reactive component along the sidewall of the wellbore.   
   
   
       4 . The method of  claim 10 , wherein the group of compressible and deformable particles comprises at least one of the group consisting of thermally softened gilsonite, graphite, polymer beads, glass ceramic spheres, starches, talc, gross cellulose, swollen, and partially swollen super-absorbent polymer particles and lead. 
   
   
       5 . The method of  claim 10 , wherein the compression surface is substantially cylindrical. 
   
   
       6 . The method of  claim 10 , wherein the compression surface is substantially annular. 
   
   
       7 . The method of  claim 10 , wherein the compression surface is substantially spherical. 
   
   
       8 . The method of  claim 10 , further comprising:
 extending an extendable support member configured to attach the compression surface to the well drilling tool assembly;   wherein the extendable support member extends the compression surface inside the wellbore; and   wherein extending the extendable support member applies a lateral force between the compression surface and the sidewall of the wellbore.   
   
   
       9 . The method of  claim 12 , wherein the at least one first reactive component released from the encapsulated materials combines with at least one second reactive component to form a cement along the sidewall of the wellbore. 
   
   
       10 . The method of  claim 12 , wherein the at least one first reactive component released from the encapsulated materials are painted on the sidewall of the wellbore by the compression surface. 
   
   
       11 . A well drilling tool assembly comprising:
 a drillstring;   a drill bit; and   at least one compression surface;   wherein the at least one compression surface attaches to the drillstring between the drill bit and a surface exit to a wellbore;   wherein rotating the drillstring rotates the at least one compression surface; and   wherein as the well drilling tool assembly rotates, the at least one compression surface exerts a lateral force along a sidewall of the wellbore.   
   
   
       12 . The well drilling tool assembly of claim  20 , further comprising:
 an extendable support member configured to attach the compression surface to the drillstring;   wherein extending the extendable support member provides a lateral force between the compression surface and the sidewall of the wellbore.