CO2 Self-Healing and Resistant Cement Technology From Laboratory to the Field
| Autor: | C. R. de Miranda, Antonio C.F. Conceição, Fatma Daou, L. M. Sarcos Ocando, S. A. Aponte, D. Guillot, D. Petersen, B. Engelke, Francisco de Assis Oliveira |
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| Rok vydání: | 2017 |
| Předmět: |
Cement
Engineering Field (physics) business.industry Well integrity 02 engineering and technology 010501 environmental sciences 01 natural sciences 020401 chemical engineering Self-healing Forensic engineering Well cementing 0204 chemical engineering business 0105 earth and related environmental sciences |
| Zdroj: | Day 2 Wed, March 15, 2017. |
| DOI: | 10.2118/184641-ms |
| Popis: | In a joint effort, an oil and gas operator and a service company have undertaken research to help overcome well integrity and cementing fluids challenges in the presalt wells of Brazil where some fields present high levels of CO2 in reservoir fluids. Results are provided from the laboratory phase to cement placement evaluation. The new approach is to provide a cementing system that is not only resistant to CO2 attack but also has a self-healing capability in the presence of fluids containing CO2. The validation of the CO2 selfhealing and resistant cement technology was initiated at laboratory level. Then, a yard test with real-time field parameters was performed, proving that the new slurry can be mixed and pumped using conventional cementing equipment. Finally, an onshore well in Brazil served as a test well for deploying and evaluating the new CO2 self-healing and resistant cement system in the field. The technology consists of an engineered particle size distribution (EPSD) blend containing a reactive material that swells upon contact with CO2. This swelling allows the closure of microfissures and/or the reduction of the microannulus, which heals the cement sheath and reestablishes the integrity of the well. Then, a large-scale yard test was performed to evaluate real-time field parameters such as the fluidity and homogeneity of the dry blend and the mixability of the slurry using conventional cementing equipment. After the success of the yard test, the technology was deployed in Brazil. During the field test, 8 m3 [50 bbl] of 1,900 kg/m3 [15.8 lbm/gal] CO2 self-healing cement was pumped downhole and placed in the annular space between a 7-in. casing and a 8.5-in. open hole to promote casing support and zonal isolation in the production zone. The CO2 self-healing and resistant cement overcomes the deficiencies of conventional Portland cement in carbon dioxide environments and presents an advantage over other available technologies designed to withstand CO2 attack by maintaining zonal isolation and long-term well integrity. Moreover, this technology can be applied in any field in the world where CO2 is regulated and/or entails risk for operators or the general public. |
| Databáze: | OpenAIRE |
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