Sequestration of bio-sludge in a subterranean formation
A method for sequestrating carbon-bearing materials in a subterranean formation by injecting a bio-slurry and determining the carbon emission effects of the injection process.
1 . A method of carbon sequestration in a subterranean formation having a wellbore extending through a target sequestration zone, the method comprising:
transporting bio-sludge containing material to an injection site, the bio-sludge containing material having a solids content;
determining a first carbon emissions associated with the transporting of the bio-sludge containing material;
processing the bio-sludge containing material into a bio-sludge injectate suitable for injection into the target sequestration zone, the processing including size degradation of the solids content and mixing of a carrier liquid with the bio-sludge containing material;
determining a second carbon emissions associated with processing the bio-sludge containing material into a bio-sludge injectate;
injecting the bio-sludge injectate into the target sequestration zone;
determining a third carbon content of the bio-sludge injectate injected into the target sequestration zone;
determining a fourth carbon emission losses associated with injecting the bio-sludge injectate into the target sequestration zone;
calculating a net carbon emission removal associated with the transporting bio-sludge containing material, processing the bio-sludge containing material into a bio-sludge injectate, injecting the bio-sludge injectate into the target sequestration zone, and the carbon emission losses.
2 . The method of claim 1 , wherein the target sequestration zone comprises a subterranean cavern; and
wherein the bio-sludge containing material includes mixed density bio-solids; and
wherein processing the bio-sludge containing material further comprises processing the mixed density bio-solids to promote sinking of the bio-solids in the carrier liquid or in the subterranean open cavern.
3 . The method of claim 2 , at least some of the bio-solids defining pores therein, the pores containing gasses trapped within the pores, and wherein processing the mixed density bio-solids further comprises opening pores in the bio-solids by grinding or milling the bio-solids, and thereby allowing gasses trapped therein to escape.
4 . The method of claim 3 , further comprising allowing a liquid to replace the trapped gasses in the pores.
5 . The method of claim 2 , further comprising separating floating bio-solids from the mixed-density bio-sludge containing materials, processing the separated floating bio-solids thereby creating a non-floating bio-solid, and placing the non-floating bio-solid to the bio-sludge injectate.
6 . The method of claim 1 , further comprising injecting the bio-sludge injectate at a pressure greater than the fracturing gradient of the sequestration zone.
7 . The method of claim 6 , wherein processing the bio-sludge containing material further comprises creating the injectate having a solids content of between one and 50% by volume, and with particle sizes of between one and 1000 microns.
8 . The method of claim 6 , wherein the bio-sludge injectate comprises remainder vegetative pulps.
9 . The method of claim 6 , wherein the bio-sludge injectate comprises spent brewer's grain and brewer's yeast by-products of a brewing process.
10 . The method of claim 6 , wherein the bio-sludge injectate comprises prokaryotes and eukaryotes, bacteria, fungi, phytoplankton, diatoms, and dinoflagellates.