A Workflow to Derive Rock Mechanics Correlations and Stress Profile by the Integration of Dynamic and Static Formation Evaluation Data

Qatari, Ammar

doi:10.2118/207030-ms

Day 3 Thu, October 07, 2021 2021

DOI: 10.2118/207030-ms

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A Workflow to Derive Rock Mechanics Correlations and Stress Profile by the Integration of Dynamic and Static Formation Evaluation Data

Ammar Qatari

Abstract: Rock mechanics utilizes empirical formulas which are based on studies of certain environments. The shortcoming of such criteria is having estimations of rock physical properties with high uncertainty and not field/formation specific. The objective of this paper is to apply a core-log integration to convert dynamic mechanical properties captured from formation evaluation logs and calibrate them with core static data to generate a continuous profile of data with low uncertainty and generate correlations applicab… Show more

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Cited by 3 publications

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A Workflow to Estimate Critical Drawdown Pressure Utilizing 1-D Geomechanics Modelling

Qatari

2023

Day 1 Sun, February 19, 2023

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The active mobility of sand particles during the production phase has put extra burden on the efficiency of hydrocarbon extraction for both oil and gas. It plays a significant role on completion design during the drilling phase. Minimizing the effect of sanding has been a major topic to tackle due to the added operational costs and time associated. Unconsolidated sand reservoirs are vastly affected worldwide due to the nature of sand particles accompanying hydrocarbon during the production phase. Sand production poses potential risks for surface and subsurface equipment within the completion design. The objective of this paper is to estimate and quantify the potentials of sand production and wellbore instability using 1-D Mechanical Earth Model (MEM). A clear workflow of the utility of raw petrophysical and 1-D geomechanics modelling data is showcased to aid production and completion operational personnel. Excessive stress concentrated around the wall of a borehole can cause the release of sand particles into the hydrocarbon stream. This process poses risks for drilling and completion operations as it affects the productivity of a well along with potential equipment damage. Unconsolidated sand reservoirs are prone to rock failure which induces the mobility of sand particles. Stress orientation regimes are properly captured by assessing the orientation of current petrophysical data. Acoustic data is also reviewed for proper in-situ rock strength property calculation. Formation pressure testing is vital to the process to estimate pore pressure gradients. Once MEM is finalized, Critical Drawdown Pressure (CDDP) is analytically calculated using the linear elastic methodology to predict sand production. The use of 1-D MEM sand management analysis to predict critical drawdown pressure is vital to avoid equipment damage and production limitations associated with sand production in a weakly consolidated reservoir. A workflow to produce an in-depth critical drawdown pressure analysis captures the changes that might occur for a perforation completion over time as it undergoes depletion. A representation of sand potential prediction and critical bottom-hole flowing pressure as a function of reservoir pressure is to be illustrated in a single depth format which allows for sensitivity analysis. This paper examines the direct impact of the analytical estimation of critical drawdown pressure as a guide to predict the potentials of sand production intervals within a certain reservoir. The mechanical properties, petrophysical raw data, and depletion status are the ingredients to produce a thorough analysis to guide drilling, production, and completion personnel to minimize sand production effects operationally. Further improvement to the model can be made by the integration of production data and reservoir properties that are captured over time.

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A Workflow to Estimate Critical Drawdown Pressure Utilizing 1-D Geomechanics Modelling

Qatari

2023

Day 1 Sun, February 19, 2023

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Evaluation of Real-Time and Post-Drilling Petrophysical Data Acquisition Impact on Wellbore Stability and Mechanical Rock Integrity

Qatari

2024

Day 3 Wed, February 14, 2024

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The objective of this paper is to examine filtrate and mud solids invasion effect on wellbore stability and rock mechanical integrity. A stable wellbore depends on the mechanical and chemical interaction between the wellbore fluid and the walls of the wellbore. Excessive wellbore pressure can cause lost circulation and low pressure of the wellbore can cause blowout or collapse. Multiple factors affect mechanical integrity of the rock including the time at which the acquisition of rock mechanical data was taken in the subsurface. The impact of invasion is measured by the exploitation of real-time and post-drilling petrophysical data. A thorough investigation of invasion and its effect on rock mechanical properties is performed to establish a full understanding of the association between time dependency and rock integrity. A mechanical earth model (MEM) is built utilizing petrophysical data acquired in both real-time and post-drilling. Mechanical properties are then cross checked with core measurements to examine the accuracy of the results. The effect of invasion is then highlighted showcasing the time dependency effect on both wellbore stability and rock mechanical integrity. Leveraging real-time and post-drilling petrophysical data across abrasive sandstone formation is key to investigate invasion effects. The effects were witnessed in the readings of resistivity. Separation of deep, medium, and shallow resistivities were observed highlighting the invasion effect due to the time passed after the drilling process and before logging the section. When it comes to invasion effects on strength of the rock, an (MEM) was run on a well with both LWD and wireline acoustic data. Fracture point was analyzed for the effects of invasion. A data comparison is highlighted showcasing the effect of time on the integrity of the rock. Capillary force and osmotic pressure effects are examined and cross checked with the logged data and wellbore stability impact. This paper examines the direct impact of invasion on the mechanical properties of the rock along with wellbore stability. Complex formations can be problematic in lithology during the drilling operation where it might be capable of creating issues such as stuck pipe. The geomechanics of borehole stress has a direct impact on the hazards and problems encountered during drilling operation which causes inefficiency in terms of time and cost spent operationally. The full understanding of invasion effect is a potential solution to such issues.

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Improving Wellbore Stability by Leveraging Real-Time Spectral Gamma Ray Logs

Qatari

2024

Day 3 Wed, February 14, 2024

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The objective of this paper is to examine the quantification effect of clay content on wellbore stability. Clay Content is known to have direct impact on hydrocarbon petrophysical modeling. The major factor to quantify clay content is to acquire spectral gamma ray logs. Utility of standalone gamma ray readings provides only qualitative clay content model in a form of clean and clay filled fashion rather than a quantified clay content. Assessing spectral gamma ray logs in real-time can be a potential factor contributing optimized decisions during the drilling operation. Dealing with abrasive sand environment require extra formation knowledge to formulate a better drilling plan that will ultimately result in a good hole condition. Wellbore stability is directly related to the formation matrix type that is being drilled. Clay content can also contribute to the calculation of permeability in the dynamic phase. To quantify clay content, spectral gamma ray logs are vital. Once spectral gamma ray logs are available, a full petrophysical lithology model is calculated featuring quantified clay content by volumetrically identify illite, orthoclase, and kaolinite contents. It directly works as a wellbore stability indicator leading drilling engineers to formulate real-time drilling plans minimizing wellbore stability issues. These plans can involve a better formulation of a mud system, change of inclination/azimuth, change of a drilling parameter such as rate of penetration to accommodate the current quantified clay content that is being drilled. The use of a quantified real-time formation clay content indicator to minimize wellbore instability is vital to avoid operational complexities and non-productive operational time. A comparison of qualitative and quantitative methodologies of clay content types verses wellbore stability is investigated. This will ultimately showcase the importance of establishing a wellbore instability mitigation plan leveraging real-time spectral gamma ray logs. Formulations of mud systems, rate of penetration recommendations are made based on the results. A representation of potential mitigation of non-productive operation time is showcased highlighting the vitality of the proposed method. This paper examines the direct impact of the quantification of clay content on wellbore stability. The process can add value to reduce the costs associated with wellbore instability. It can also manage to lower the non-productive operational time caused by a changed bit due to an inefficient management of either drilling mud/rate of penetration due to an unquantified formation clay content.

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A Workflow to Derive Rock Mechanics Correlations and Stress Profile by the Integration of Dynamic and Static Formation Evaluation Data

Cited by 3 publications

References 2 publications

A Workflow to Estimate Critical Drawdown Pressure Utilizing 1-D Geomechanics Modelling

A Workflow to Estimate Critical Drawdown Pressure Utilizing 1-D Geomechanics Modelling

Evaluation of Real-Time and Post-Drilling Petrophysical Data Acquisition Impact on Wellbore Stability and Mechanical Rock Integrity

Improving Wellbore Stability by Leveraging Real-Time Spectral Gamma Ray Logs

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