| 摘要 |
This invention relates to methods for stimulating oil production from well by pumping reactive stimulation fluids from the well into the formation. The methods are particularly relevant to cold heavy oil production. This invention provides methods of stimulating production from a formation surrounding a well, comprising pumping a fluid from the well into the formation so as to create a hydraulic fracture, wherein the fluid contains one or more reactive species that destabilise cohesive forces in the formation matrix, and allowing the fluid to leak of into the formation and react with the formation matrix so as to produce a destabilised zone in the formation around the location of the fracture such that formation fluids and sand particles can be produced from the formation through the zone and into the well. The methods preferably comprise selecting the fluid so as to produce an at least partially unconsolidated formation matrix in the destabilised zone. It is particularly preferred to produce fluids from the formation so as to cause worm-holing in the destabilised zone. The fluid can contain additives in liquid form, solid or granular form. It is also preferred that the fluid acts as a diluent for heavy oil and can also modify formation fluid rheology.
|
