Well integrity testing tool

Abstract

A liner top testing tool to be fitted on a drilling equipment configured to perform drilling for formation of a well and cleaning a casing inside the well is disclosed. The tool comprises a landing sub coated with crushed carbide, configured to land on liner top of the casing inside the well, a junk breaker configured to break casing drill cement and junk into small pieces, an element packer configured to isolate mud of the casing drill cement and the junk inside the casing and test integrity of the well, a scraper configured to scrap the casing and clean ahead of the element packer for improved isolation and good test, a stabilizer sleeve having bearing ball configured to stabilize the tool and provide high RPM to the stabilizer sleeve, and a mandril disposed in between the landing sub, the junk breaker, the element packer scraper, and the stabilizer sleeve.

1 . A liner top testing tool to be fitted on a drilling equipment configured to perform drilling for formation of a well and cleaning a casing inside the well, the tool comprising:
 a landing sub coated with crushed carbide, configured to land on liner top of the casing inside the well;   a junk breaker configured to break casing drill cement and junk into small pieces, wherein the junk breaker comprises a filter sub to further reduce size of the junk and the cement while the drilling;   an element packer configured to isolate mud of the casing drill cement and the junk inside the casing and test integrity of the well;   a scraper configured to scrap the casing and clean ahead of the element packer for improved isolation and good test;   a stabilizer sleeve having bearing ball configured to stabilize the tool; and   a mandril disposed in between the landing sub, the junk breaker, the element packer scraper, and the stabilizer sleeve; wherein the mandril is configured to rotate the junk breaker, and the stabilizer sleeve.   
     
     
         2 . The tool as claimed in  claim 1 , wherein the landing sub is configured to land on liner top of the casing with 45-degree profile, wherein, on application of mechanical weight resulting in application of shear force, thereby allowing element packer to activate and redress liner top of cement in the well. 
     
     
         3 . The tool as claimed in  claim 1 , wherein the stabilizer sleeve having bearing ball configured to provide high rotations per minute (RPM) to the stabilizer sleeve. 
     
     
         4 . The tool as claimed in  claim 1 , wherein, the stabilizer sleeve having spiral groves configured to provide large flow area to drilling water created from the mud while rotation. 
     
     
         5 . The tool as claimed in  claim 1 , wherein the scraper is non-rotating and comprising one or more collapsible blade configured to provide high flexibility with high flow area to the drilling fluids. 
     
     
         6 . The tool as claimed in  claim 1 , wherein the scraper comprising one or more thrust bearing to avoid friction with the junk breaker. 
     
     
         7 . The tool as claimed in  claim 1 , wherein the element packer is supported by an upper packer support and a lower packer support for enhanced rigidity. 
     
     
         8 . The tool as claimed in  claim 7 , comprising an inner sleeve configured to accommodate the landing sub, the junk breaker, the scraper, and the lower packer support. 
     
     
         9 . The tool as claimed in  claim 8 , wherein the inner sleeve comprises grove for mechanical stop key to stop excessive weight form the tool. 
     
     
         10 . The tool as claimed in  claim 1 , comprising a spring configured to act as shock absorber to reduce impact caused due to the tool shear. 
     
     
         11 . The tool as claimed in  claim 10 , wherein the spring is configured to work as retract mechanism to push the landing sub, the junk breaker, and the scraper, back to original position after usage of the tool. 
     
     
         12 . The tool as claimed in  claim 1 , wherein the test of the integrity of the well is conducted using pressure test selected from group comprising negative pressure test or positive pressure test or a combination thereof. 
     
     
         13 . The tool as claimed in  claim 12 , wherein the negative pressure test of the integrity of the well is conducted by keeping a drilling fluid generated from the mud above the element packer and generating a static pressure equal to a formation pressure of the well. 
     
     
         14 . The tool as claimed in  claim 13 , wherein an underbalanced fluid is fed below the element packer to lower the static pressure. 
     
     
         15 . The tool as claimed in  claim 12 , wherein the integrity is determined by measuring the difference between the lowered static pressure and the formation pressure. 
     
     
         16 . The tool as claimed in  claim 12 , wherein the well is considered integrated where there is no increment of the lowered static pressure.