Modeling the Behavior of Smart Oil Well Cements and Offshore Pipe-Soil Interaction in Very Soft Soil

It is critical to ensure the durability of the oil and gas production infrastructures from borehole to pipelines. Rheology properties and hardening characteristics are some of the important parameters for cementing slurry during installation. Also over the last decade, health monitoring of the plugging material during service life became more important and vital. In this study, smart cement with enhanced sensing properties was modified with fly ash class C up to 50% to investigate the effect on sensing and strength properties. By adding high volume fly ash class C (50%) to the modified oil well cement, fractional change in resistance during compression was doubled compare to specimens without fly ash and also water loss during curing was reduced greatly. Offshore pipelines play an important role in transporting crude oil and natural gas from wellbore to the controlling platforms. Hence it is critical to understand the supporting mechanism of pipeline on the deep-water sea beds. In this study pipe-soil interaction was investigated by varying the soft soil strength from 0.3 kPa to 1 kPa and embedment depth. Also, this study investigated on using current modified oil well cement for health monitoring of offshore pipeline. Two new models have been developed to predict the vertical soil resistance on plastic pipe. Also by adding 0.5% carbon fiber to the modified oil well cement, soil resistance load during penetration on pipeline was captured. Fractional change in resistivity increased during penetration and for normalized penetration (H/D) of 55%, fractional change was 25%.

Name thesis:degree_name

Master of Science

Level thesis:degree_level

Masters

Discipline thesis:degree_discipline

Civil Engineering

Grantor

University of Houston

Year dc:date.issued

2014

Author dc:creator

• Kheiri, Pooya

Advisor dc:contributor.advisor

• Vipulanandan, Cumaraswamy

Committee members dc:contributor.committeemember

• Nakshatrala, Kalyana Babu
• Lim, Gino J.

• Smart cement
• Oil well cement
• Offshore pipeline
• Pipe soil interaction

Statement dc:rights

• The author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. UH Libraries has secured permission to reproduce any and all previously published materials contained in the work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/10657/1912

OAI identifier oai:identifier

oai:uh-ir.tdl.org:10657/1912