Economic Evaluation of the Use of Well Logs for Diagnosing Conformance Problems

Frisch, Gary; Graham, Larry; Wyatt, D.F.

doi:10.2118/40036-ms

Cited by 13 publications

(3 citation statements)

References 5 publications

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“…Without this process, many treatment solutions may be improperly placed and obvious failures can result. [6][7][8] Often, a better understanding of the physical and architectural structure of the associated reservoir or nearwellbore problem(s) can be obtained by performing a "placement capability -diversity testing" from injection analysis. Structurally, problems may exist in various mediums or structures and have a wide range of complexities or interferences.…”

Section: Diagnostics -Problem Identificationmentioning

confidence: 99%

Investigations on Treatment Controls for Placement of Chemical and/or Cement Squeezes

Creel

Bahamon

Abdulkadir

2005

International Petroleum Technology Conference

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractComputer 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. IntroductionThe 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. Often, because of the rapid ongoing assemblage of incoming data and decisions needed on remedial squeeze operations, there is little time to perform detailed and complicated calculations to interpret the conditions and events affecting the treatment and its results. To place these complex treatments, developing a computer simulation to address these processes can enable operators to visualize a design and operations plan and eventually to witness their ongoing remediation work in realtime. Crucial pressure analysis needed to determine whether the placement process is progressing as desired and having indicators of when to quit injection are valuable knowledge tools. Developing a predetermined design an...

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Section: Diagnostics -Problem Identificationmentioning

confidence: 99%

Investigations on Treatment Controls for Placement of Chemical and/or Cement Squeezes

Creel

Bahamon

Abdulkadir

2005

International Petroleum Technology Conference

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“…The ultrasonic logs consist of two types of tools, one having a rotating transducer and the other has eight stationary transducers. Several previously published papers in the bibliography Frisch et al 1,3,4 provide more detail about tool theory and applications.…”

Section: Basic Cement Evaluation Toolsmentioning

confidence: 99%

“…These differences led to the Statistical Variance Processing (SVP) processing that has been previously published by Harness et al, 2 and Frisch et al 1,3,4 The SVP processing was originally developed for the fixed ultrasonic tools, but has been adapted to the newer generation of rotating ultrasonic tools. The aim of SVP processing is to highlight the subtle changes in the impedance in order to distinguish solid and liquid phases, especially in lightweight or foam cements.…”

Section: Cement Evaluationmentioning

confidence: 99%

Advances in Cement Evaluation Tools and Processing Methods Allow Improved Interpretation of Complex Cements

Frisch

Fox

Hunt

et al. 2005

Proceedings of SPE Annual Technical Conference and Exhibition

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractEvaluation of cement bonding and zonal isolation is a challenge that the oil and gas industry continues to face as wells are drilled deeper within more hostile environments. The complexity of this task has increased as these wellbores have more challenging trajectories and being drilled in formations for which there is little drilling and completions experience. In addition, cement slurries have become more complex with the addition of inert gases, micro-spheres, non-traditional liquids, and many other additives designed to improve the cement sheath quality. These slurries require non-traditional interpretation methods to effectively evaluate the cement sheath because older methods do not yield accurate results in these situations. This paper will present information concerning the existing cement evaluation logging tools, basic interpretation techniques, and an overview of the new, advanced methods for existing tools available from a variety of vendors in the industry.Progress is continuously being made in the development of more effective cement evaluation tools and evaluation techniques. Standard cement evaluation logging tools consists of two major classes, sonic and ultrasonic. The standard cement bond log, segmented bond log, and radial bond log are all part of the sonic logging family. The ultrasonic family consists of tools with either a rotating transducer or a stationary array of transducers. This paper, however, will not focus on the hardware but will focus on the interpretation of available measurements and on facilitating optimized decisions using measurements from both families.Advanced interpretation methods discussed in this paper broaden and refine previously published methods in order to effectively evaluate wellbore conditions with the commonly available cement evaluation tools. The original processes developed in the early 1990s now incorporate a statistical variance mapping display for both the sonic and ultrasonic

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Common well cements and the mechanism of cement-formation bonding

Lupyana

Maagi

2020

Reviews in Chemical Engineering

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This article reviews the common well cements and describes the basic nature of the cement-formation bond in zonal isolation and its effects on the mechanical and hydraulic performance. The cements are Classes G and H Portland well cements. The cement-formation interface bonding mechanism is a combination of the mechanical indentation of the cement hydrates that interlock to the formation surface and the chemical reactions that occur between the cement slurry and constituents of the rock grains. Mechanical indentation occurs as the hydration products epitaxially grow at the formation surface. The degree to which each of these processes accounts for the formation of the bond is unknown. Here we provide a review of well cement and cement-formation bonds and a discussion of the possible factors that are proposed to influence the microstructural, chemical, and mineralogical properties at the cement-formation interface. In addition, we present some findings about how these factors affect the mechanical and hydraulic performance of the cement-formation bond in zonal isolation.

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Economic Evaluation of the Use of Well Logs for Diagnosing Conformance Problems

Cited by 13 publications

References 5 publications

Investigations on Treatment Controls for Placement of Chemical and/or Cement Squeezes

Investigations on Treatment Controls for Placement of Chemical and/or Cement Squeezes

Advances in Cement Evaluation Tools and Processing Methods Allow Improved Interpretation of Complex Cements

Common well cements and the mechanism of cement-formation bonding

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