Wellbore cement degradation in contact zone with formation rock

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27350%2F16%3A86097445" target="_blank" >RIV/61989100:27350/16:86097445 - isvavai.cz</a>

Výsledek na webu

<a href="http://link.springer.com/article/10.1007/s12665-015-5114-z" target="_blank" >http://link.springer.com/article/10.1007/s12665-015-5114-z</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s12665-015-5114-z" target="_blank" >10.1007/s12665-015-5114-z</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Wellbore cement degradation in contact zone with formation rock

Popis výsledku v původním jazyce

In the work the risk of CO2 migration in deep wells, caused by integrity loss on cement-rock interface and thow wellbore integrity correlated with the formation rock lithology were determined. 19 composed samples of rock and wellbore cement were exposed to CO2-saturated brine, in the autoclave reactor, under the formation conditions (50 degrees C and 10 MPa). Mineralogical and textural changes in the cement-rock interface in the case of selected rocks (sandstones, shale, limestones, dolomites and anhydrites) were characterised. The performed examination indicates that both cement and formation rocks react with CO2 saturated brine under the experimental conditions. The cement alteration is characterised by carbonation process in the outer rim, but it is enhanced on the interface with formation rock. It was stated that the performance of the cement-rock interface is essentially dependent on the rock lithology, including mineral composition and rock structure. Some minerals are very easily dissolving, e.g., anhydrite, gypsum, calcite and feldspars, what is contributing to an increase in the porosity and permeability in cement-rock contact zone. Primary dissolution of certain minerals in the first stages of the experiment results in the secondary precipitation after the last stage of reaction contributing to a secondary reduction of pore space.

Název v anglickém jazyce

Wellbore cement degradation in contact zone with formation rock

Popis výsledku anglicky

In the work the risk of CO2 migration in deep wells, caused by integrity loss on cement-rock interface and thow wellbore integrity correlated with the formation rock lithology were determined. 19 composed samples of rock and wellbore cement were exposed to CO2-saturated brine, in the autoclave reactor, under the formation conditions (50 degrees C and 10 MPa). Mineralogical and textural changes in the cement-rock interface in the case of selected rocks (sandstones, shale, limestones, dolomites and anhydrites) were characterised. The performed examination indicates that both cement and formation rocks react with CO2 saturated brine under the experimental conditions. The cement alteration is characterised by carbonation process in the outer rim, but it is enhanced on the interface with formation rock. It was stated that the performance of the cement-rock interface is essentially dependent on the rock lithology, including mineral composition and rock structure. Some minerals are very easily dissolving, e.g., anhydrite, gypsum, calcite and feldspars, what is contributing to an increase in the porosity and permeability in cement-rock contact zone. Primary dissolution of certain minerals in the first stages of the experiment results in the secondary precipitation after the last stage of reaction contributing to a secondary reduction of pore space.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DH - Báňský průmysl včetně těžby a zpracování uhlí

OECD FORD obor

—

Projekt

<a href="/cs/project/LO1406" target="_blank" >LO1406: Institut čistých technologií těžby a užití energetických surovin - Projekt udržitelnosti</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Environmental Earth Sciences

ISSN

1866-6280

e-ISSN

—

Svazek periodika

75

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

15

Strana od-do

498-513

Kód UT WoS článku

000372251000050

EID výsledku v databázi Scopus

2-s2.0-84961160025