Method of casing integrity assessment in an interval where a cement plug is to be installed in a well proposed for abandonment

A method of well integrity assessment in an interval including a casing, a tubing string and a production packer placed inside the casing, and a cement sheath and rocks adjacent thereto, the method comprising:

• identifying a target zone above the production packer for cement plug installation;
• installing a temporary cement plug below the target zone;
• pressure testing the target zone;
• assessing an integrity of the target zone based on steady pressure data or pressure variation in time;
• perforating the casing and cement sheath in the target zone above the production packer;
• initiating a repeat pressure test of the target zone;
• during the repeat pressure test, conducting a logging survey including acoustic, temperature, defectoscopy, and production logging in the target zone;
• issuing a findings report on integrity of the casing and the cement sheath for subsequent installation of the cement plug for well abandonment via rigless operations or remedial cementing at designated locations where integrity failures have been identified based on the logging survey.

A method of well integrity assessment in an interval including a casing, a tubing string and a production packer placed inside the casing, and a cement sheath and rocks adjacent thereto, the method comprising:

• identifying at least two target zones below the production packer for cement plug installation;
• pressure testing the at least two target zones;
• assessing an integrity of the at least two target zones based on steady pressure data or pressure variation;
• perforating the casing and cement sheath in the at least two target zones;
• installing an inflatable packer between the at least two target zones;
• initiating a repeat pressure test of the at least two target zones;
• during the repeat pressure test, conducting a logging survey including acoustic, temperature, defectoscopy, and production logging in the at least two target zones;
• issuing a findings report on integrity of the casing and the cement sheath for subsequent installation of the cement plug for well abandonment via rigless operations or remedial cementing at designated locations where integrity failures have been identified based on the logging survey.

A method of well integrity assessment in an interval including a casing, a tubing string and a production packer placed inside the casing, and a cement sheath and rocks adjacent thereto, comprising the following phases:

• identifying at least two target zones for cement plug installation, wherein one target zone is situated above the production packer and the other is situated below the production packer;
• pressure testing the at least two target zones;
• assessing an integrity of the at least two target zones based on steady pressure data or pressure variation in time;
• perforating the tubing string, the casing, and the cement sheath in the at least in two target zones;
• installing an inflatable packer between the at least two target zones;
• initiating a repeat pressure test of the target zone;
• during the repeat pressure test, conducting a logging survey including acoustic, temperature, and defectoscopy in the at least two target zones;
• issuing a findings report on integrity of the casing and the cement sheath for subsequent installation of the cement plug for well abandonment via rigless operations or remedial cementing at designated locations where integrity failures have been identified based on the logging survey.

A method of well integrity assessment in an interval including a casing, a cement sheath and rocks adjacent thereto, the method comprising:

• identifying a target zone for cement plug installation;
• installing a temporary cement plug below the target zone;
• pressure testing the target zone;
• assessing an integrity of the target zone based on steady or dropping pressure data;
• perforating the casing and the cement sheath in the target zone above the temporary cement plug;
• initiating a repeat pressure test of the target zone;
• during the repeat pressure test, conducting a logging survey including acoustic, temperature, defectoscopy, and production logging in the target zone;
• issuing a findings report on integrity of the casing and the cement sheath for subsequent installation of the cement plug for well abandonment via rigless operations or remedial cementing at designated locations where integrity failures have been identified based on the logging survey.