Method of well control

Abstract

Methods and systems for well control are disclosed. The methods may include drilling, using a drilling system, a wellbore to a first depth within a formation using a drilling fluid with a first density. The methods may further include, while drilling the wellbore, obtaining, from the drilling system, a first value of each drilling parameter associated to the first depth, determining, using a first model, a first value of a formation pressure based on the first value of each drilling parameter and a value of the first density of the drilling fluid, and determining, using a second model, a first value of a drilling fluid drop based on the first value of the formation pressure. The methods may still further include drilling the wellbore to a second depth within the formation using the drilling fluid with a second density based on the first value of the drilling fluid drop.

What is claimed is: 
     
         1 . A method comprising:
 drilling, using a drilling system, a wellbore to a first depth within a formation using, at least in part, a drilling fluid with a first density;   while drilling the wellbore:
 obtaining, from the drilling system, a first value of each of a plurality of drilling parameters associated to the first depth, 
 determining, using a first model, a first value of a formation pressure based, at least in part, on the first value of each of the plurality of drilling parameters and a value of the first density of the drilling fluid, and 
 determining, using a second model, a first value of a drilling fluid drop based, at least in part, on the first value of the formation pressure; and 
   drilling, using the drilling system, the wellbore to a second depth within the formation using, at least in part, the drilling fluid with a second density based, at least in part, on the first value of the drilling fluid drop.   
     
     
         2 . The method of  claim 1 , further comprising determining a formation pressure profile based, at least in part, on the first value of the formation pressure associated to the first depth and a second value of the formation pressure associated to the second depth. 
     
     
         3 . The method of  claim 1 , further comprising determining a drilling fluid drop profile based, at least in part, on the first value of the drilling fluid drop associated to the first depth and a second value of the drilling fluid drop associated to the second depth. 
     
     
         4 . The method of  claim 1 , wherein drilling the wellbore comprises blind drilling the wellbore. 
     
     
         5 . The method of  claim 1 , wherein drilling the wellbore to the first depth within the formation further comprises using, at least in part, the drilling fluid with a first volume. 
     
     
         6 . The method of  claim 5 , wherein drilling the wellbore to the second depth within the formation further comprises using, at least in part, the drilling fluid with a second volume. 
     
     
         7 . The method of  claim 1 , wherein drilling the wellbore to the first depth within the formation further comprises using the drilling system with a first value of a first drilling parameter,
 wherein the plurality of drilling parameters comprises the first drilling parameter.   
     
     
         8 . The method of  claim 7 , wherein drilling the wellbore to the second depth within the formation further comprises using the drilling system with a second value of the first drilling parameter. 
     
     
         9 . The method of  claim 1 , wherein the plurality of drilling parameters comprises a rheology parameter. 
     
     
         10 . The method of  claim 1 , wherein determining the first value of the formation pressure comprises:
 determining a first value of a d-exponent and a first value of a corrected d-exponent based, at least in part, on the first value of each of the plurality of drilling parameters;   determining, using the first model, the first value of the formation pressure based, at least in part, on the first value of the d-exponent, the first value of the corrected d-exponent, and the value of the first density of the drilling fluid.   
     
     
         11 . A system comprising:
 a drilling system configured to:
 drill a wellbore to a first depth within a formation using, at least in part, a drilling fluid with a first density; and 
   a computer system configured to, while drilling the wellbore:
 receive, from the drilling system, a first value of each of a plurality of drilling parameters associated to the first depth, 
 determine, using a first model, a first value of a formation pressure based, at least in part, on the first value of each of the plurality of drilling parameters and a value of the first density of the drilling fluid, and 
 determine, using a second model, a first value of a drilling fluid drop based, at least in part, on the first value of the formation pressure, 
   wherein the drilling system is further configured to drill the wellbore to a second depth within the formation using, at least in part, the drilling fluid with a second density based, at least in part, on the first value of the drilling fluid drop.   
     
     
         12 . The system of  claim 11 , wherein the drilling system comprises a plurality of drilling sensors. 
     
     
         13 . The system of  claim 12 , wherein each of the plurality of drilling sensors is configured to obtain the first value of each of the plurality of drilling parameters. 
     
     
         14 . The system of  claim 12 , wherein the plurality of drilling sensors comprises a rheology sensor. 
     
     
         15 . The system of  claim 12 , wherein the plurality of drilling sensors comprises a surface drilling sensor. 
     
     
         16 . The system of  claim 12 , wherein the plurality of drilling sensors comprises a downhole drilling sensor. 
     
     
         17 . The system of  claim 12 , wherein the plurality of drilling sensors comprises a hydraulic sensor. 
     
     
         18 . The system of  claim 11 , wherein the drilling system is configured to blind drill the wellbore. 
     
     
         19 . The system of  claim 11 , wherein the computer system is further configured to determine a formation pressure profile based, at least in part, on the first value of the formation pressure associated to the first depth and a second value of the formation pressure associated to the second depth. 
     
     
         20 . The system of  claim 11 , wherein the computer system is further configured to determine a drilling fluid drop profile based, at least in part, on the first value of the drilling fluid drop associated to the first depth and a second value of the drilling fluid drop associated to the second depth.