Jefrayn Energy Services has set the industry standard for how to manage well integrity throughout the wells life cycle; This standard it can be used to assess the application of many different well integrity management systems.
Well Integrity is the well’s capability to perform its function to contain and control the flow of fluids within predetermined barriers throughout its designed life. Managing well integrity begins with constructing wells that comply with integrity standards and preserving the well condition to the end of its life cycle. Software, tools and applications specified in many well integrity management systems fall quite short of the Jefrayn Energy Services definition of well integrity management system. Most of these systems apply to the operational phase of a well’s life whereas comprehensive well integrity begins at the exploration phase and continues through its abandonment.

The word integrity is derived from the word integer which means “a whole number” and or “the state of being integral, whole or unified” and it also refer to the soundness of construction. Between these two meanings one can safely define Well Integrity as” the unity of well objective, design and soundness of its construction”. Based on the above definition; Well Integrity is “the well’s capability to perform its function to contain and control the flow of fluids within the predetermined barriers throughout its designed life”.

Jefrayn Energy Services’ Well Integrity Management will ensure that wells are properly designed, executed, operated and maintained for a definite period of time after which they are safely plugged and abandoned. Well integrity can be realized through “application of technical, operational and organizational solutions to reduce risk of uncontrolled release of formation fluids throughout the life cycle of a well.” (Jefrayn Energy Services Standard WIMS-01). A comprehensive Well Integrity Management System should satisfy provide clear guidance from the planning to abandonment ensure the following:

Provide a clear and precise well objective that is based on current reservoir development and earth model study. All possible well utilization scenarios (production, injection, gas lift) to recomplete the well into a different zone, or any operation deemed necessary for field development must be clearly stated in the well life development plan. The earth model should cover all potential risk structures above the target reservoir through accurate mapping of geomechanical data.

A well design must meet, in a cost effective way, all the requirements including advances in technology to satisfy safety, environmental and regulatory standards.

This is the shortest but most critical phase in the well life cycle as well integrity can only be verified once the well is drilled to target and completed according to the plan and design. During this phase the system must provide the tools to assess the competency of construction staff in order to assure that sound construction practices are followed during the operations phase.

The system should set out the guidelines for best operations and preventive maintenance practices and for the monitoring, recording and management of data to maintain well integrity to the end of its operational life.

The system should ensure that permanent flow control barriers are restored and the status and condition of these barriers is monitored. An important point to be considered during the design and operation phase is that once installed and cemented in place it is generally not possible in most cases or practical to repair the conductor, surface or intermediate casings. Therefore, permanent design for abandonment must be considered before the drilling of the well and implemented during the construction phase.

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