Patent ID: 7533725

Claim:
A method for accessing a target fluid in a formation of an oilfield having at least one wellbore, the method comprising: acquiring physicochemical property information of a portion of the formation, wherein the physicochemical property information comprises a chemical potential of a pore fluid in the formation; determining a type and a concentration of a chemical agent based on the physicochemical property information of the portion of the formation, wherein the chemical agent comprises a formate with a chemical potential that is a lower chemical potential than a chemical potential of the pore fluid; applying the chemical agent at the portion of the formation to provide a chemical action, wherein the chemical action comprises osmotic action, wherein the osmotic action extracts the pore fluid from the portion of the formation, wherein a pore pressure in the portion of the formation is reduced based on extracting the pore fluid to form a reduced pore pressure; and applying a hydraulic pressure exceeding a threshold to form a fracture in the portion of formation, wherein the threshold is reduced based on the reduced pore pressure, wherein the fracture releases the target fluid at the portion of the formation, and wherein the target fluid is released at the portion of the formation responding to the chemical action.