Method using multiple retrieval processes to increase mobility of heavy oil and including a sampling system

摘要

A method of retrieving a formation fluid from a formation adjacent a borehole wall is provided in which a tool 10 is lowered into the wellbore 14. The tool may include first and second fluid retrieval tools 15 and 17. A first retrieval process is initiated in which the first retrieval process includes attempting to increase the mobility of the formation fluid. At least one downhole parameter related to the mobility of the fluid is then measured, and the first retrieval process changed based on the measured downhole parameter. The parameter may be temperature or viscosity. A second retrieval process is then initiated, in which the second retrieval process includes increasing the mobility of the formation fluid. The fluid sample is then retrieved from the formation with the tool. The retrieval processes may include heating and chemical injection.