5 Casing Cementing Case Study - Drillers

Enhancing 5" Liner Cementing Operation

Background

This case study delves into a 5″ Liner cementing operation. The study aims to analyze the operation, identify challenges, and provide recommendations for future similar operations.

Objectives

The primary objectives encompass gathering comprehensive information on the cementing operation, comparing job design with actual data, conducting a post-job analysis for cement coverage, interpreting the Cement Evaluation log, identifying root causes, and proposing recommendations to enhance future job outcomes.

Work Methodology

The post-job analysis methodology involves scrutinizing the interplay of job design, conditions, and execution. It incorporates a thorough review of data, encompassing spacer and mud preparation, slurry mixing, fluid compatibility, and post-job stability tests.

Report Presentation Muqim – 1 V Final.pptx

Job Facts

Key facts include the use of 6″ OD Centralizers in a 7.07″ hole diameter, standoff variations, discrepancies in the centralizer tally, annular volume circulation, pressure fluctuations, spacer preparation details, and differences in reported consumption of Barite.

Analysis

The analysis covers pressure analysis, TOC estimation methods, fluids intermixing limitations, acoustic impedance analysis, and summary findings. Pressure analysis indicates channeling in the 5″ x open hole zone, and acoustic impedance analysis reveals inconsistencies suggesting channeling and an eccentric pipe.

Root Causes

Insufficient cement circumferential coverage is attributed to factors such as improper fluids design, spacer-cement mixture with higher Yp, similar rheology between spacer and mud, lack of centralization or liner rotation, insufficient fluids laboratory testing, and unreported scavenger slurry rheology.

Conclusions

The insufficient cement coverage in the 5″ liner cementing operation is a result of multiple factors. The study emphasizes the need for improvements in fluids design, rheology, centralization, laboratory testing, and spacer stability.

Specific Recommendations:

Ensure proper pre-job well circulation for homogeneous mud density and hole conditioning.
Utilize hydraulic software or a cementing simulator for estimating expected circulating pressure.
Improve centralization or implement liner rotation (5 – 20 rpm) to enhance stand-off.
Use Yp as a reference for desired fluid rheology, ensuring Yp of primary slurry > Yp of Spacer > Yp of Mud.
Re-design or eliminate the scavenger slurry based on rheological considerations.
Perform a complete compatibility check of spacer, mud, and cement slurry as per API guidelines.
Conduct sedimentation tests and dynamic settling tests for the spacer using an HPHT consistometer.
Ensure rheology compatibility with mud and cement at various API mixing ratios.

This case study highlights the importance of meticulous planning, execution, and analysis in cementing operations, especially in challenging conditions.

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Work completed by: Lenin Diaz

Cement Job Case Study

Well Cementing and Fluids Specialist

Lenin Diaz

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