1Instituto Superior Técnico, Av Rovisco Pais, 1049-001 Lisboa, Portugal2Universidade Fernando Pessoa - CIAGEB, Praça de 9 de Abril 349, 4249-004 Porto, Portugal3Academia das Ciências de Lisboa, Rua da Academia das Ciências 19, 1249-122 Lisboa, Portugal

3rd Symposium on Gondwana Coals, Porto Alegre, Brazil 16-18 Sept 2009

European Patent EP 1 801 346 A1

“Process for Carbon Dioxide Sequestration

by Injection in Coal Seams”

Application filed on 21st December 2006; Published 27/06/2007 Bull 2007/26 (with priority to

21/12/2005, referring to Portuguese Patent PT 10340605 of 21st December 2005).

Inventors:

A. Mouraz Miranda (IST)

C.F. Rodrigues (UFP)

M.J. Lemos de Sousa (UFP)

Acronym: SEQCO2

3rd Symposium on Gondwana Coals, Porto Alegre, Brazil 16-18 Sept 2009

The invention corresponds to geologic and mining engineering

domain and consists of a

.

3rd Symposium on Gondwana Coals, Porto Alegre, Brazil 16-18 Sept 2009

► to

, therefore contributing

to reduce the greenhouse effect in the atmosphere, and

► depending of the needs,

.

3rd Symposium on Gondwana Coals, Porto Alegre, Brazil 16-18 Sept 2009

The allows:

► to inject and diffuse CO2 and other gases,

, in coal seams in which the gases

will be stored by adsorption

► to produce from the same seams energetic natural

gas

3rd Symposium on Gondwana Coals, Porto Alegre, Brazil 16-18 Sept 2009

3rd Symposium on Gondwana Coals, Porto Alegre, Brazil 16-18 Sept 2009

Boreholes will be

and will be drilled as to maximize the

contact surface (specific free surface) between the CO2 and the

coal, taking into account:

► local geological characteristics and the underground

geometry/setting of coal seams

► coal cleat orientation and connectivity

3rd Symposium on Gondwana Coals, Porto Alegre, Brazil 16-18 Sept 2009

3rd Symposium on Gondwana Coals, Porto Alegre, Brazil 16-18 Sept 2009

Cased Zone

Screen Zone

Christmas Tree

3rd Symposium on Gondwana Coals, Porto Alegre, Brazil 16-18 Sept 2009

Injection Packer

3rd Symposium on Gondwana Coals, Porto Alegre, Brazil 16-18 Sept 2009

Boreholes for

, and will also have and placed in the

zone of coal seam

Boreholes will also be provided with appropriate for

3rd Symposium on Gondwana Coals, Porto Alegre, Brazil 16-18 Sept 2009

perpendicular or horizontal

to the seam plan orientation

3rd Symposium on Gondwana Coals, Porto Alegre, Brazil 16-18 Sept 2009

Shrinking effects will occur depending of coal characteristics

3rd Symposium on Gondwana Coals, Porto Alegre, Brazil 16-18 Sept 2009

Swelling effects will occur depending of coal characteristics

3rd Symposium on Gondwana Coals, Porto Alegre, Brazil 16-18 Sept 2009

“Methods for injection of acid

compounds in an underground

reservoir”

“Process for Carbon dioxide

sequestration by injection in

coal seams”

3rd Symposium on Gondwana Coals, Porto Alegre, Brazil 16-18 Sept 2009

3rd Symposium on Gondwana Coals, Porto Alegre, Brazil 16-18 Sept 2009

3rd Symposium on Gondwana Coals, Porto Alegre, Brazil 16-18 Sept 2009

16-18 Sept 20093rd Symposium on Gondwana Coals, Porto Alegre, Brazil