Method of well decommissioning in through-tubing applications

Abstract

Systems and methods presented herein provide for well de-commissioning and other operations in through-tubing applications. A control device analyzes the well to plan a reconfiguration, wherein the reconfiguration eliminates flow through a control line in the well. A downhole tool fills the control line, segments the control line into smaller sections, confirms positioning of the sections following the segmenting. The control device measures a state of the well in real time during the filling and segmenting, and wherein the filing and segmenting are modified based on the measured state. Additionally, a washing operation can be performed to remove residuals prior to performing a cementing operation to fill the annular space.

What is claimed is: 
     
         1 . A method for well decommissioning, slot recovery, or barrier restoration in through-tubing applications, comprising:
 analyzing the well, including tubing integrity, to build a hydraulic model, wherein the hydraulic model optimizes a reconfiguration that includes cutting a window through tubing and configures a wash operation;   performing the reconfiguration, including at least one of the following reconfiguration operations:
 filling a control line with barrier fluid; and 
 segmenting the control line into smaller sections, including confirmation of positioning and isolation of the control line following the segmenting; 
   confirming a first state of the well after the reconfiguration using at least one of a camera and an ultrasonic sensor;   performing the washing operation to remove residual cement; and   confirming a second state of the well after the washing operation.   
     
     
         2 . The method of  claim 1 , wherein initial identifications are made for well depth, control line positioning, and cements in annular space, and wherein the initial identifications are used to create the hydraulic model. 
     
     
         3 . The method of  claim 1 , wherein configuring the washing operation includes determining compounds and rates to use during the wash operation. 
     
     
         4 . The method of  claim 1 , further comprising determining gun sizes and gun types to use in the cutting. 
     
     
         5 . The method of  claim 1 , further comprising making real-time measurements of a current state of the well and the bottomhole assembly during the cutting to optimize the cutting operation. 
     
     
         6 . The method of  claim 1 , wherein the washing includes making downhole measurements to monitor progress of the washing in real time and adjust operational parameters to optimize the washing operation. 
     
     
         7 . The method of  claim 1 , further comprising performing a cementing operation, including setting a sleeve to isolate the cement in an annular space, pumping the cement in the annular space, confirming a quality of the cement in the annular space, and pumping cement into a tubular of the well. 
     
     
         8 . The method of  claim 7 , wherein the second state is confirmed prior to the cementing operation, and wherein confirming this second state includes ensuring that barriers are free of contamination, surfaces are wet for bonding, and spacers are installed. 
     
     
         9 . The method of  claim 7 , wherein confirming the quality of the cement includes milling the cement. 
     
     
         10 . The method of  claim 7 , further comprising confirming a third state of the well after the cement operation, including using a pressure gauge below a barrier set in the well to determine whether the barrier meets a threshold integrity level. 
     
     
         11 . The method of  claim 10 , wherein confirming the third state includes making a volumetric estimation of the cement placed identifying a top of the cement. 
     
     
         12 . The method of  claim 10 , wherein confirming the third state includes using distributed sensing measurements obtained over fiber optics to determine a top of the cement. 
     
     
         13 . A system for well decommissioning in through-tubing applications, comprising:
 a downhole tool that includes a perforating device, a barrier-fluid pumping device and a cleaning device; and   a control device, wherein the control device performs stages for decommissioning the well, comprising:
 analyzing the well to plan a reconfiguration, wherein the reconfiguration eliminates flow through a control line in the well; 
 filling the control line with barrier fluid; 
 segmenting the control line into smaller sections; and 
 confirming positioning of the sections and their isolation following the segmenting, 
 wherein the control device measures a state of the well in real time during the filling and segmenting, and wherein the filing and segmenting are modified based on the measured state. 
   
     
     
         14 . The system of  claim 13 , the stages further comprising, prior to the segmenting, dropping guns of a size and type chosen based on the analyzing. 
     
     
         15 . The system of  claim 14 , wherein the dropped guns are used to perforate various media in the wellbore. 
     
     
         16 . The system of  claim 13 , wherein the state of the well is measured based on at least one of a camera and ultrasonic sensor. 
     
     
         17 . The system of  claim 13 , the stages further comprising performing a washing operation after the confirming. 
     
     
         18 . The system of  claim 17 , the stages further comprising performing a cementing operation after the washing operation to fill an annular space of the wellbore. 
     
     
         19 . The system of  claim 13 , wherein the perforating device, the cement pumping device, and the cleaning device can be selectively activated or reactivated by the control device. 
     
     
         20 . A non-transitory, computer-readable medium containing instructions for well decommissioning in through-tubing applications, the instructions causing a processor to execute stages comprising:
 analyzing the well to plan a reconfiguration, wherein the reconfiguration eliminates flow through a control line in the well;   filling the control line with cement;   segmenting the control line into smaller sections; and   confirming positioning of the sections and their isolation following the segmenting,   wherein the control device measures a state of the well in real time during the filling and segmenting, and wherein the filing and segmenting are modified based on the measured state.