Abstract

Computer simulations addressing the placement of chemicals and/or cements for remedial repair workovers have given valuable assistance in repairing well integrity problems. Situations encountered such as tubular leaks, annulus isolation and integrity failures, wellbore repairs, and reservoir communication problems between wells or multiple laterals may be addressed with more accuracy. Using a variety of diagnostics to define problems and help in the selection of solutions and maintaining a monitored selective placement on the problem areas can now be performed. The solutions selected should be based on the diagnostics performed in an investigation to define the problems, their sources, and their physical features. This approach provides a more defined architectural structure of the reservoir and/or the near-wellbore region. In this process, descriptions for the needed attributes and capabilities of the desired solutions are determined based on the identified problem's remediation requirements.

The ability to visualize a planned and witnessed remediation work in real-time is helpful in solving a problem. Pressure analysis used to determine whether a treatment is progressing as desired and when a maximum placement condition is reached are valuable knowledge tools. Using predetermined designs to conduct treatments can give the operator detailed assistance in determining ongoing processes and safety points. Placement techniques can be determined and limits defined based on the maximum placement pressure allowed and the initial pressure of entry on the placement interval.

This paper will detail opportunities using a computer design simulation program and performing treatments using this predetermined knowledge and planning phase. Various case histories using chemical and/or cement solutions are demonstrated to show the planning techniques and actual job progressions. The capability to address complex designs and solutions are demonstrated by showing the techniques used and a typical case employing this technology.

Introduction

The ability to predict placement and treatment pressures during remedial and/or conformance squeeze operations can enable operators to address their wells' identified problems without generating further complications and further losses of integrity.

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