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2006-1850: CEMENT SLURRY PROPERTIES MONITORING THROUGH ADDITIVES CONTROL REDUCES LANDFILL DUMPS Abstract

The essence of this work is to show students how to reduce landfill dumps in onshore drilling and cementing operations by close looped monitoring of additives. While liquid additives are used in offshore & international cementing operations, land-based operations use a bulk-dry- batch-mixed process. Additives control cement volumetric yield, thickening time, compressive strength, free water, rheology, and fluid loss control. Computerized closed-loop control of liquid additives 1) allow unused, uncontaminated cement to be hauled off location after an operation, 2) promote environmental responsibility by reducing the volume of waste cement hauled to a landfill, and 3) provide better quality control of slurries pumped "on-the-fly" due to better distribution of additives in the slurry and tighter computerized tolerances. Students are challenged to always work towards environmentally friendly processes and use of flow regime equations to vary viscosity. Laboratory tests are carried out to verify the predictions made through the regime equations.

Surface slurries utilizing liquid sodium silicate in API Class C Cement were designed to meet or exceed Texas Railroad Commission Rule 13 requirements for "zone of critical cement" "extended cement" systems. Slurries were tested for thickening time, free water, compressive strength, and rheology for various combinations of weight, water, yield, additive concentration, and adherence to TRRC (Texas Railroad Commission) Rule 13 specifications.

Introduction

Partnerships with different research units of various Petroleum companies and Government Agencies has enhanced a quality research program both at the doctoral and masters level, and enabled the Department of Petroleum Engineering at Texas Tech take up real life challenges in the industry and importantly in posing stimulating our students to meet up with the these changes. Better quality control, cost savings, superior slurry performance, improved handling and logistics are some of the main factors why the uses of liquid-additives cement systems have been considered in the past. However, in recent years, environmental concerns and social responsibility considerations are perhaps the most compelling reasons why the use of liquid- additive cement systems should be employed.

In the industry today, liquid-additives cement systems are almost exclusively used for offshore and international cementing operations. This is due to two main reasons: space limitations and logistic/operational feasibility of dry-blending additives in cement systems. During this operation, bulk cement is stored on the rig, and liquid additives (such as sodium silicate, which is use as an extender in moderate concentrations and an accelerator in small concentrations) are precisely measured and added to mix water. This offers the convenience of having neat cement at a remote location with the ability to custom design cement slurries at the well site. However, cement ageing, additive shelf life, slow compressive strength development and end slurry sensitivity to density variation are some of the limitations associated with the use of slurries with

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Fasesan, O., & Ogunsanya, S., & Heinze, L. (2006, June), Liquid Additives Control Waste And Reduces Landfill Dumps Paper presented at 2006 Annual Conference & Exposition, Chicago, Illinois. 10.18260/1-2--1065