Methods and tools for determining bleed-off pressure after well securement jobs

Abstract

A system for setting a wellhead pressure after a through tubing bridge plug is installed in a wellbore includes a slickline unit, a static bottomhole pressure gauge, and a pressure setting unit. The slickline unit includes the static bottomhole pressure gauge. The static bottomhole pressure gauge includes internal memory that stores a measured bottomhole pressure. The pressure setting unit sets a wellhead pressure based on the measured bottomhole pressure stored in the internal memory of the static bottomhole pressure gauge. A related method includes installing a through tubing bridge plug in a wellbore, deploying a slickline unit into the wellbore, wherein the slickline unit includes a pressure gauge, measuring bottomhole pressure with the pressure gauge, and setting a wellhead pressure based on the measured bottomhole pressure.

What is claimed: 
     
         1 . A method comprising:
 installing a through tubing bridge plug in a wellbore;   deploying a slickline unit into the wellbore, wherein the slickline unit includes a pressure gauge;   measuring bottomhole pressure with the pressure gauge; and   setting a wellhead pressure based on the measured bottomhole pressure.   
     
     
         2 . The method according to  claim 1 , wherein the slickline unit is deployed to position the pressure gauge at a predetermined distance above the through tubing bridge plug. 
     
     
         3 . The method according to  claim 1 , wherein setting the wellhead pressure comprises determining wellhead pressure available for bleed-off. 
     
     
         4 . The method according to  claim 3 , wherein:
 the plug has an associated differential pressure limit; and   determining the wellhead pressure available for bleed-off is based on the measured bottomhole pressure and a differential pressure limit of the plug.   
     
     
         5 . The method according to  claim 4 , wherein determining the wellhead pressure available for bleed-off is based on the measured bottomhole pressure, the differential pressure limit of the plug and a safety factor. 
     
     
         6 . The method according to  claim 1 , further comprising:
 capping the through tubing bridge plug with cement; and   the slickline unit is deployed at a predetermined time after setting of the cement.   
     
     
         7 . The method according to  claim 1 , further comprising storing, at a first data storage location, data that includes the measured bottomhole pressure. 
     
     
         8 . The method according to  claim 7 , further comprising:
 transferring the stored data from the first data storage location to a second data storage location; and   obtaining the data from the second data storage location to use in setting the wellhead pressure.   
     
     
         9 . The method according to  claim 8 , further comprising retrieving the pressure gauge out of the wellbore after said measuring. 
     
     
         10 . The method according to  claim 9 , wherein the first data storage location comprises internal memory disposed in the pressure gauge. 
     
     
         11 . The method according to  claim 10 , wherein the transferring of data comprises transferring data from the internal memory of the pressure gauge to the second data storage location. 
     
     
         12 . The method according to  claim 1 , wherein:
 the slickline unit includes a terminal component disposed at a free end of the slickline unit; and   the pressure gauge is disposed axially adjacent to the terminal component.   
     
     
         13 . The method according to  claim 12 , wherein the terminal component is a gauge cutter. 
     
     
         14 . The method according to  claim 12 , wherein the terminal component is a lead impression block. 
     
     
         15 . The method according to  claim 1 , wherein the pressure gauge is a static bottomhole pressure gauge. 
     
     
         16 . A system for setting a wellhead pressure after a through tubing bridge plug is installed in a wellbore, said system comprising:
 a slickline unit that includes a static bottomhole pressure gauge;   the static bottomhole pressure gauge including internal memory that stores a measured bottomhole pressure; and   a pressure setting unit that sets a wellhead pressure based on the measured bottomhole pressure stored in the internal memory of the static bottomhole pressure gauge.   
     
     
         17 . The system according to  claim 16 , wherein:
 the slickline unit includes a terminal component disposed at a free end of the slickline unit; and   the pressure gauge is disposed axially adjacent to the terminal component.   
     
     
         18 . The system according to  claim 17 , wherein the terminal component is a gauge cutter. 
     
     
         19 . The system according to  claim 18 , wherein the terminal component is a lead impression block. 
     
     
         20 . A method comprising:
 installing a through tubing bridge plug in a wellbore;   capping the through tubing bridge plug with cement;   deploying a slickline unit into the wellbore, wherein the slickline unit includes a pressure gauge;   measuring bottomhole pressure with the pressure gauge;   storing, at a first data storage location, data that includes the measured bottomhole pressure;   transferring the stored data from the first data storage location to a second data storage location;   obtaining the data from the second data storage location to use in setting a wellhead pressure; and   setting a wellhead pressure based on the measured bottomhole pressure.